Flushing of heat exchangers of heating boilers. How to flush the boiler with chemicals: substances used and methods of work

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Chemical flush gas boilers and heat exchangers

An essential condition for high performance and full-fledged functioning of boiler equipment is regular flushing. Chemical washing is usually applied to both household and industrial boilers. Minimization of the corrosive effect on metal parts is possible only with proper monitoring of the condition of the boiler unit. If you neglect regular cleaning of the system, the heating capacity of the boiler will decrease, and scale will form on its inner surface.

Chemical washing is the most effective way cleaning, allowing you to maintain the performance of the boiler at the proper level.

Estimated cost of services

The cost of work is formed based on the model of the boiler, location, heat exchange surface area, water volume and degree of contamination.

The cost of work is formed based on the heat exchanger model, location, heat exchange surface area, water volume.

What explains the need to flush boiler and heat exchange equipment with chemicals?

In practice, the quality of water for heating networks does not correspond to established standards. Failure to comply with the regulations during the commissioning of the system starts the process of sedimentation of excess salt and other impurities on the surface of the pipes. In this regard, the hydraulic regime is violated, the useful volume of networks is reduced, which leads to a complete imbalance and threatens the integrity of the system. It is not possible to carry out mechanical cleaning of pipes and equipment due to the lack of technical capacity, so chemical flushing becomes almost the only and most effective method cleaning the system.

Stages of flushing boiler equipment:

1. Preliminary inspection of the inner surface and heating elements.
2. Determination of the level of contamination and selection of chemical reagents.
3. Direct washing of boiler equipment under the strict supervision of specialists.
4. Drawing up a report on the work done.

Chemical flushing of the boiler with a sludge level of more than 1500 g/m3 or with a content of silicic acid (sulphates) in sediments above 10% is carried out in two stages with preliminary alkalization before the acid stage.
If the amount of sludge working surface boiler unit is more than 3000 - 4000 g / m, an alternation of acid and alkaline treatment stages is required.
In certain cases, acid flushing of the boiler must be preceded by mechanical (hydrodynamic) flushing of sludge-laden areas, which makes it possible to get rid of porous and non-cemented deposits. In this case, the duration of cleaning and the amount of chemicals needed for effective flushing is significantly reduced.

Basic requirements for the chemical washing process:
- use of safe detergents to avoid damage to the surfaces of the boiler;
- possibility efficient removal deposits without the formation of insoluble compounds.

Flushing of heat exchangers

Regular flushing will not only increase the performance of the heat exchanger and reduce the risk of defects on the working surfaces, but also prevent premature equipment failure.
Chemical flushing is necessary to clean the internal surfaces of the heat exchanger from harmful deposits that reduce the thermal conductivity of the system. Excessive pollution interferes with the productive operation of the heat exchanger and forces to take measures for artificial adjustment temperature regime. Regular flushing helps to avoid unforeseen accidents and damage to heat exchange equipment.

Chemical flushing of the heat exchanger is carried out in several stages:

1. The introduction of a solution with active substances into the heat exchanger, which, when reacting with deposits on the internal surfaces, split them and remove them from the unit.
2. Washing the plates of heat exchange equipment with water in order to remove the residual reagent. In case of inefficient flushing, active substances can react with the coolant, which will lead to damage to the equipment.
3. Alkaline washing of internal surfaces.
4. Hydraulic tests newly commissioned heat exchange equipment.

Examples of contamination of boiler surfaces

Samples of the maximum pollution extracted from the water part of the heating surfaces of the boiler

Boiler water path - scale deposits before and after boiler flushing

Smoke tubes

Connection of flame tube and tube plate

BOILER ERROR

Cleaning, flushing of industrial boilers and repair of the circuit is one of the services that we provide to regular and new customers. Our specialists will competently perform chemical, hydrodynamic and mechanical cleaning, flushing of the boiler, heat exchanger and piping systems. Under influence high temperatures in a boiler device of any type, sooner or later, deposits and scale begin to form. Salt and scale adversely affect thermal conductivity, increase fuel consumption.

Among the services we provide - cleaning and flushing of industrial boilers:

Cleaning and flushing of heating boilers;

Cleaning and flushing of gas boilers;

Cleaning and flushing of hot water boilers;

Cleaning and flushing of steam boilers;

Cleaning and flushing of boiler heat exchangers;

Cleaning and washing of boilers dkvr.

Timely and professional service boilers are the key to the smooth and efficient operation of your equipment. Boiler cleaning can be done in different ways:

Chemical cleaning boiler descaling;

Hydrodynamic cleaning washing the boiler from scale and soot;

Mechanical cleaning boiler descaling.

For selection best way boiler cleaning, correct selection equipment and reagents, it is necessary to contact specialists.

Hydrodynamic cleaning boiler flushing

By contacting GLOBAL-ENGINEERING LLC, you can also order the processing of the boiler apparatus by the hydrodynamic method. This is a physical action on deposits in boilers using a high pressure water jet. The possibility of mechanical damage to the internal surface of the system is completely excluded here, which cannot be guaranteed in the case of using other mechanical methods. Our craftsmen have all the necessary devices for pre-start purge and flushing of the steam boiler by the hydrodynamic method. This is one of the most effective ways rid the boiler of dirt and scale. Hydrodynamic cleaning Washing of boilers is carried out with water under high pressure using special equipment for washing (special pumps, nozzles and other devices). To remove heavy deposits, a device is used over high pressure(ASVD).

Chemical cleaning Boiler flushing

The main condition for high performance and full-fledged functioning of boiler equipment is regular flushing of deposits. Both domestic and industrial boilers are commonly subjected to chemical flushing. Minimization of the corrosive effect on metal parts is possible only with proper monitoring of the condition of the boiler unit. If you neglect regular cleaning of the system, the heating capacity of the boiler will decrease, and scale will form on its inner surface.

Scope of work during chemical washing of the boiler:

• Preliminary diagnostics of water circuits of heat exchange equipment by hydraulic method overpressure. (for the tightness of the circuits)
• Chemical cleaning in place of industrial boilers, monitoring the progress of the reaction by measuring the pH level throughout the cleaning.
• Alkalinization of the boiler.
• Neutralization of the washing solution, repeated washing with water.
• Hydraulic tests (pressurization) of the boiler.

What do you get as a result of flushing or cleaning the boiler:

• Reduce fuel consumption by up to 25%;
• Decreases the likelihood of emergencies(local overheating, cracks at individual nodes, etc.) by 60%;
• Increased service life after washing.

Prevention is The best way avoid unscheduled, and therefore costly repairs or, even worse, a complete replacement of equipment.

Our staff employs qualified and experienced employees who know their business, so flushing the boiler will not be difficult for them. We are always ready to help you, so if you have any questions, you can contact our managers who will answer your questions 24/7. Entrust the boiler cleaning procedure experienced professionals. Contact a reliable engineering service company.

Timely chemical flushing of boilers performed by our company’s employees will get rid of scale in cases where other cleaning methods do not bring desired result. The formation of scale on heating surfaces reduces the operating period of the equipment and reduces heat transfer. Maintenance will eliminate the appearance of defects, damage to equipment and system failure.

The effectiveness of the procedure

Chemical flushing of boilers is one of the most popular services, it is regularly performed by the company's masters. It allows you to clean surfaces heat exchange devices without dismantling the unit. The reagent used penetrates into hard-to-reach places installations, determining the quality of cleaning.
The choice of solution, reagent concentration and cleaning method is made on an individual basis. It depends on the thickness and density of the coating, the degree of contamination and the material of the internal surfaces of the boiler. To carry out the work, the following equipment is required: a pump, an expansion tank, a piping system for connecting to a boiler plant and removing carbon dioxide. The procedure requires strict adherence to safety rules due to the use of strong reagents. The execution steps include the following:

• diagnostics of the system, determination of the degree of contamination and designation of possible defects;
• selection of one or more solutions for the efficiency and safety of work;
• flushing (filling liquids and their circulation inside the containers);
• neutralization of the actions of reagents and passivation of treated surfaces;
• final rinse with clean water.

As a result of the procedure, the hydraulic performance of the boiler plant is improved, fuel consumption is reduced and efficiency is increased. Metal passivation is the prevention of corrosion formations leading to large-scale destruction of the walls. Cleaning the heat exchanger prevents premature failure and associated financial costs. Regular control chemical composition water used during the operation of the system will eliminate the problems that occur with excessive mineralization and violation of the acid-base balance.

Treatment Benefits

By providing chemical cleaning services for boiler equipment, we strive to create attractive conditions for long-term cooperation. Numerous service stations managed to appreciate the responsible attitude to work and the professional level of employees. Benefits of the treatment include:

• performance of work of any complexity within the time specified in the contract;
• careful handling of equipment, excluding unintentional breakdowns and damage;
• compliance with safety standards by masters;
• absence of factors that contribute to pollution environment;
• availability of the latest equipment and high-quality consumables;
• an individual approach that determines the choice of reagent, the duration of exposure and the method of manipulation;
• attractive cost and transparency of pricing policy;
• providing professional advice and detailed answers to questions regarding the repair and maintenance of boilers of various configurations.

To use the service for chemical washing of boilers, just call the specified phone number or fill out the order form. We are ready to cooperate, contact us!

Timely technical inspection and maintenance of boiler equipment will always contribute to its uninterrupted and stable operation.

One of the important maintenance works is the cleaning and washing of boilers.

In this article we will describe in detail all the nuances and aspects of this type of work.

The essence of the procedure

The inner walls of pipes before and after chemical treatmentIt is not a secret for anyone that during the operation of boiler equipment, scale and various kinds chemical pollution. This, in turn, complicates the operation of the boiler system.

The scope of work, which includes cleaning and removing unnecessary deposits, is precisely called the chemical washing of the boiler.

It is also worth noting that flushing is a relatively inexpensive cleaning method that results in maximum efficiency. (You can read about descaling the heating boiler here).

Advantages

Chemical flushing of boilers contributes to the following positive aspects:

Such improvements confirm once again that flushing is really effective and rational method boiler system cleaning.

Sequence of work

Flushing of boiler equipment should take place in a strictly defined order, the main stages of which are the following important points:

• complete shutdown of the boiler and cooling;
• draining from the technical fluid system;
• filling the boiler unit with a chemical solution using a special device;
• cyclic circulation of the solution in the system;
• draining the spent product;
• flushing of boiler equipment industrial water;
• disposal of all waste.

In fact, all stages of work do not pose any particular technical difficulties, but for a better understanding, it is worth dwelling in more detail on which devices are used to carry out the entire washing process.

Equipment for cleaning boiler systems

As mentioned above, the entire process of chemical washing is carried out using a special device called a booster.

The booster consists of the following elements:

It should be noted that the booster is a unique device of its kind, which greatly facilitates the washing of boiler equipment.

Materials used

An important aspect of washing the boiler unit is the question of the use of various acidic substances.

Exist the following types acids with which the boiler equipment is cleaned:

1. Adipic acid. This substance is diluted with water in a certain proportion, and is directly fed into the boiler with the help of a booster. Carbon dioxide, when interacting with dirt and scale, dissolves them, and then turns into a precipitate, which is subsequently washed out under the pressure of process water. The best option for using a solution with adipic acid would be for chemical washing of domestic boilers for heating.
2. Lemon acid. This type of acidic substance greatly simplifies the cleaning of the boiler, as it can be added directly to the reagent that circulates in process water.
3. Sulfamic acid. After the circulation of this reagent in the boiler equipment, it is necessary to thoroughly rinse the system and then dry it. This type of acid effectively cleans the interior surfaces of steam boilers.
4. Hydrochloric acid. The concentration of the solution of this aggressive substance directly depends on the thickness of the contaminated scale. If the thickness of the deposits is 1 mm, then, accordingly, there should be a 1% solution. In other cases, the concentration of the solution does not increase, and the boiler is flushed several times. Hydrochloric acid is optimally suited for cleaning waste heat boilers.
5. Gel. This type of substance does not belong to acidic environments, however, it dissolves oil-based pollutants quite well. The main condition for the use of a gel substance is a thorough flushing of the boiler equipment with technical fluid.

After reviewing the characteristics of chemicals for cleaning the boiler, we can conclude that all types of substances used are aggressive, so you must take precautions when working with them.

Safety regulations

When working with substances for chemical washing of boilers, it is necessary to observe a number of the following recommendations:

In this article, we have introduced you in detail to all aspects of chemical washing of boiler equipment. Taking them into account, you can easily cope with the dry cleaning of boilers of any modification.

Watch the video in which experts demonstrate competent chemical washing of the boiler:

• print

heat.guru

Flushing of boilers and heat exchangers: technology, chemicals

The boiler is flushed when the apparatus ceases to function normally. At the same time, most users turn to specialists who will clean the boilers for money and make all the necessary settings. But few people think that they can cope with this task on their own. But in vain.

Time to clean the boiler

Cleaning is done in three cases:

Boiler flush options

• mechanical;
• hydraulic;
• complex.

What is a heat exchanger

• chemical;
• mechanical;
• combined.

There are also disadvantages:

Washing Reagents

• pollution level;

Advantages:

Disadvantages:

Conclusion

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Chemical flushing of boilers - useful information from ASGARD-Service

The company "ASGARD-Service" carries out chemical washing of boilers various types:

• Steam, hot water (by type of heat carriers);
• Gas, solid fuel, diesel (according to the type of fuel);
• Boiler equipment.

Figure 1. Boilers

The problem with boiler fouling is a periodic and inevitable phenomenon, corresponding to the fuel used, the type of heat carrier, and water treatment. When using diesel fuel, the pollution of the furnace space occurs 3 to 4 times faster than when using gas. Using solid fuel(wood/coal) boilers may be contaminated according to an even tighter schedule. The space filled with coolant is distinguished by other types of pollution (salts, rust, etc.). The occurrence of such situations affects the deterioration of the economic component of the enterprise and can lead to considerable losses.

Figure 2 and 3. Pollution on boilers.

Procedure for chemical washing of boilers

This method cleaning of boilers and boiler equipment is the simplest and most reliable. When performing it, specialists use acidic reagents that contribute to quick and high-quality loosening, removal of deposits, scale and other types of deposits from the walls of boilers. Each boiler manufacturer develops its own recommendations for the selection of cleaning agents. Therefore, guided by their recommendations, the necessary solution for washing is selected. The actions of our specialists are fully consistent with the documents of manufacturers, working documentation.

Figure 3. The result of cleaning.

All work on cleaning boilers is carried out by our specialists in accordance with RD 34.37.402-96 " standard instruction on operational chemical cleaning of hot water boilers. This document states that all types of deposits can be cleaned using the following detergents: hydrochloric acid, sulfuric acid, as well as sulfuric acid with ammonium hydrofluoride, sulfamic acid, low molecular weight acid concentrate (NMA).

With a specific detergent, our specialists are determined after agreement with the customer and identifying the degree of contamination of the equipment that needs cleaning. It should be noted that the use of any acidic solution is made in combination with a corrosion inhibitor to protect the metal of the boiler.

The cleaning procedure includes:

• Calculation of the required amount of reagent, corresponding to the volume of the boiler;
• Filling the reagent inside the boiler;
• Creation closed loop to circulate the solution.

During circulation, all types of deposits are separated, passing into solution and settling in an intermediate tank included in the flushing system. A few hours of work are enough to completely clean the boiler and prepare for work.

The time of the cleaning procedure corresponds to the degree of contamination of the boiler and can be either several hours or several days (for complete completion chemical reaction). These parameters are used to calculate the cost of work taking place at a particular facility.

Our specialists have successfully carried out chemical washing works at the following facilities:

asgard-service.com

Chemical washing of boilers

Chemical flushing of the heat exchanger is carried out using certified reagents by qualified specialists. When carrying out chemical washings, the risk of mechanical damage to the equipment is minimized. Heat exchangers are washed within 1-2 days, depending on the volume and degree of contamination. Previously, before flushing, the chemical engineer evaluates the nature and degree of contamination. Regular flushing will ensure reliable performance equipment and fuel economy.

Devices and devices

Acid is poured into the container using special equipment, most often boosters are used for this purpose. The devices consist of a container in which the reagent is placed, and a pump that pumps it into the boiler. Also, the equipment has an electric heater designed to increase the temperature of the reagent. It must be remembered that employees carrying out such maintenance of the boiler room must be equipped with protective clothing, rubber gloves and special goggles.

Estimated cost of services

The cost of work is formed based on the model of the boiler, location, heat exchange surface area, water volume and degree of contamination.

The cost of work is formed based on the heat exchanger model, location, heat exchange surface area, water volume.

What explains the need to flush boiler and heat exchange equipment with chemicals?

In practice, the quality of water for heating networks does not meet established standards. Failure to comply with the regulations during the commissioning of the system starts the process of sedimentation of excess salt and other impurities on the surface of the pipes. In this regard, the hydraulic regime is violated, the useful volume of networks is reduced, which leads to a complete imbalance and threatens the integrity of the system. It is not possible to carry out mechanical cleaning of pipes and equipment due to the lack of technical capacity, so chemical flushing becomes perhaps the only and most effective method of cleaning the system.

Stages of flushing boiler equipment:

1. Preliminary inspection of the inner surface and heating elements.2. Determining the level of contamination and selection of chemical reagents.3. Direct washing of boiler equipment under the strict supervision of specialists.

4. Drawing up a report on the work done.

Chemical flushing of the boiler with a sludge level of more than 1500 g/m3 or with a content of silicic acid (sulphates) in sediments above 10% is carried out in two stages with preliminary alkalization before the acid stage. If the amount of sludge on the working surface of the boiler unit is more than 3000 - 4000 g/m, alternation of acidic and alkaline treatment stages is required.

In certain cases, acid flushing of the boiler must be preceded by mechanical (hydrodynamic) flushing of sludge-laden areas, which makes it possible to get rid of porous and non-cemented deposits. In this case, the duration of cleaning and the amount of chemicals needed for effective flushing is significantly reduced.

The main requirements for the chemical washing process: - the use of safe detergents to avoid damage to the surfaces of the boiler;

The ability to effectively remove deposits without the formation of insoluble compounds.

Flushing of heat exchangers

Regular flushing will not only increase the performance of the heat exchanger and reduce the risk of defects on the working surfaces, but also prevent premature equipment failure. Chemical flushing is necessary to clean the internal surfaces of the heat exchanger from harmful deposits that reduce the thermal conductivity of the system. Excessive pollution interferes with the productive operation of the heat exchanger and makes it necessary to take measures to artificially adjust the temperature regime. Regular flushing helps to avoid unforeseen accidents and damage to heat exchange equipment.

Chemical flushing of the heat exchanger is carried out in several stages:

1. The introduction of a solution with active substances into the heat exchanger, which, when reacting with deposits on the internal surfaces, split them and remove them from the unit.
2. Washing the plates of heat exchange equipment with water in order to remove the residual reagent. In case of inefficient flushing, active substances can react with the coolant, which will lead to damage to the equipment.
3. Alkaline washing of internal surfaces.
4. Hydraulic tests of the newly commissioned heat exchange equipment.

Examples of contamination of boiler surfaces

Samples of the maximum pollution extracted from the water part of the heating surfaces of the boiler

Boiler water path - scale deposits before and after boiler flushing

Smoke tubes

Connection of flame tube and tube plate

Time to clean the boiler

Cleaning is done in three cases:

1. For prevention. Such washing of boilers is carried out by the owner of the house once or twice a year. At the same time, a minimum of money and effort is spent.
2. When the heat exchanger is contaminated with scale or soot, its efficient operation is reduced. In this case, you can fix the problem yourself or call the wizard.
3. The heat generator has failed. He just stops. In this case, you can not do without a specialist. He adjusts the system and flushes it.

Boiler flush options

There are only three ways to flush a gas boiler for repair purposes:

• mechanical;
• hydraulic;
• complex.

The second and third methods are the most effective. If preventive or regular cleaning of the boiler can be done by hand, then it is better to entrust the repair to professionals.

mechanical method consists in the use of physical force and tools in order to clean the scale in the boilers. These can be scrapers or brushes, as well as modern spreading heads with various types of drives. Tools must be chosen correctly and used with care. If the walls of the boiler are damaged, this will lead to increased corrosion, and then to the rapid failure of the entire system. The least dangerous for the device is flushing with hydraulics. Pressurized water removes scale from all parts of the boiler.

With the complex option, washing of the boilers is carried out by water pressure using tools. Most often this happens if there is too much pollution in some part of the device.

What is a heat exchanger

The gas boiler has in its design an element that is located above the furnace and is a connected tube. They circulate coolant. Its location is not accidental, the combustion of gas in the boiler must heat the coolant, which is located in the heat exchanger.

The coolant is water. As it heats up, it passes further through the system. But untreated water contains many impurities in its composition, which can settle in the tubes when heated. Most often these are salts and lime particles. With a lot of pollution, water hardly passes through the pipes, which leads to malfunctions.

Time to clean the heat exchanger

There is a lot of controversy about when the heat exchanger needs to be flushed. gas boiler. There are signs that will tell you it's time for a cleansing. The most important ones are:

• always on gas-burner in the boiler;
• the circulation pump began to work with noise, which indicates its overload;
• heating radiators heat up much longer in time;
• gas consumption has increased, although the operating mode of the boiler has not changed;
• the water pressure has weakened (pay attention to this sign when you need to flush a double-circuit boiler).

Procedure for flushing the heat exchanger with a booster

Booster is a special device for chemical cleaning. It allows the reagent solution to circulate autonomously in the heat exchanger.

1. The first step is to disconnect both nozzles of the device from the heating system.
2. One of them is connected to the booster hose, through which the reagent will be supplied.
3. The second pipe is also connected to the booster hose, but with another one. The spent solution will go into it. It turns out that the system will close, and circulation will occur, and without additional participation.
4. The spent solution will remain in the booster, it must be drained. Wash the heat exchanger with water.

It is better to clean with a booster several times, since the reagent gradually reduces its properties, and new solution increase cleaning efficiency.

Methods for flushing the boiler and heat exchanger

Flushing of the gas boiler heat exchanger is carried out to preserve bandwidth device and its thermal properties.

Devices may differ in the type of heat exchanger and the quality of the water used, depending on this, they should be washed in different ways. There are three reliable and proven methods:

• chemical;
• mechanical;
• combined.

Chemical method of flushing the heat exchanger

Boilers are cleaned using reagents, mainly acids, and a special installation is required.

With the help of such an installation, the acid is dissolved to the desired consistency and heated. Temperature significantly affects the quality of washing. After preparing the solution, it is fed into the heat exchanger, and then it is removed.

Cleaning of heat exchangers occurs due to the presence and circulation of acid in it. Finish rinsing with plenty of water.

There is a possibility that the scale consists of various chemical components, therefore, cleaning should be carried out using additional flushing of the boilers with other chemicals.

Acid flushing has the following advantages:

• no need to remove and disassemble the device, which saves time;
• after such cleaning, the most common contaminants - hardness salts and magnesium hydroxide - will not remain in the heat exchanger.

There are also disadvantages:

• apply it with a slight degree of pollution;
• those contaminants that are formed due to corrosion cannot be removed by this method;
• safety measures are mandatory, since the reagents are very toxic and dangerous;
• the solution after washing must be neutralized and disposed of.

Washing Reagents

Manufacturers different kind Chemistry provides a choice of several options for the means by which gas boilers are flushed.

Several parameters should be taken into account when choosing a particular tool:

• pollution level;
• the material from which the boiler and heat exchanger are made, their reaction to the purchased chemical agent.

The following substances are suitable for cleaning a home boiler:

• citric acid - its effectiveness in removing scale is very high;
• sulfamic and adipic acids - effective for preventive cleanings and regular washing, with slight contamination;
• hydrochloric acid - this tool is used to eliminate very strong pollution;
• various gels - they need to be dissolved in water (efficiency is in no way inferior to previous remedies).

Chemical flushing of boilers and heat exchangers is carried out only in compliance with special safety measures.

Mechanical method of flushing the heat exchanger

The main difference from the chemical method is the disassembly of the entire heat exchanger.

After that, each of the parts is washed separately with a stream of water under strong pressure. This method is used in very rare cases, when pollution is not amenable to other types of cleaning.

Advantages:

• effective at heavy pollution, even corrosion products can be washed only by this method;
• the use of chemicals is excluded - this is absolutely safe method;
• no need for additional disposal of the washing solution.

Disadvantages:

• The main disadvantage of mechanical flushing is the disassembly of the whole unit. This is very difficult to do, and some devices do not even have disassembly instructions. In any case, it will require a lot of effort and a lot of time.
• In order for the water pressure to be strong enough, you need to use an additional device.
• The cost of mechanical flushing will significantly exceed chemical flushing due to high labor costs.

The second variant of the mechanical method:

• The first step is to disconnect the boiler from the power supply.
• Disassemble it and carefully pull out the heat exchanger.
• Immerse the element in a container with a low concentration acid solution for a period of 3 to 7 hours, depending on the degree of contamination.
• Rinse the heat exchanger running water and install in its original place.

Experts advise when washing with water to tap a little on the device to improve cleaning. The most effective method is the soaking of parts when cleaning a double-circuit boiler.

The method of combined washing of the heat exchanger

Serious and neglected pollution cannot be cleaned by only one of the methods, therefore, a combined one is used.

There may be several types of chemical contaminants in the heat exchanger, as well as corrosion products. When washing in any of the ways, special balls can be added to the solution, which will create additional pressure and be able to repel scale from the walls of the device.

Conclusion

Flushing boilers and cleaning them from soot is possible without outside help. But it is a completely different matter with flushing the heat exchanger. Here you will need confidence in success - if it is not there, then for the first time you can call the master. At the same time, carefully monitor his actions so that when you clean it again, you can be sure that you can handle it yourself.

AT in general terms the process of chemical flushing of the boiler is as follows. During the chemical flushing of the boiler, water is first drained from the boiler circuit, then the unit for chemical washing of the boiler is connected to the boiler, which includes a tank with a reagent, a reverse pump and a heating element. With the help of a chemical boiler flushing unit, a boiler flushing agent consisting of an acid solution is pumped into the boiler. After that, the circulation of the solution through the boiler pipes begins. The circulation time of the acid solution through the boiler pipes depends on the degree of contamination of the boiler and the nature of the deposits, on average it is 4-7 hours when washing the boilers of the most common types.

During the operation of the chemical boiler washing plant, the circulation of the acidic chemical washing solution is determined by our specialists depending on the change in color of the solution (dissolved deposits are added to the solution) and on the basis of the results of constant pH tests.

After required amount acid solution is pumped into the boiler, initially the pH of the solution for chemical boiler washing is maintained at a level of 1-2, that is, the solution for chemical boiler washing has strong acidic properties.

Then, over time, the acidity of the chemical washing solution begins to gradually decrease, as the acid is consumed during the reaction of the acid washing agent for boilers with iron oxides and salts of magnesium and calcium.

After the pH of the solution stabilizes at the level of 4-5 units, a new portion of acidic materials for washing the boilers is added to the solution, and the ion content rises again to the pH mark of 1-2.

A similar procedure is repeated several times during the flushing of the boilers; until the boiler flushing specialist notes a decrease in the rate of acid pH drop; that is, as long as the pH 2 acid boiler wash solution maintains this value for a long time. This will mean that the acid solution for boiler washing and chemical boiler washing has nothing more to react with, that is, all deposits and scale are in dissolved form.

After the reagent completely dissolves scale and deposits in the circulation process when washing the boiler, water with dissolved deposits is drained from the boiler and disposed of.

After that, the boiler cleaning process is completed by washing the boiler with water until all the deposits dissolved during boiler cleaning are removed from the boiler with running water.

Summing up the article on chemical washing of boilers, we can say with confidence that chemical washing is a reliable cheap means to completely clean the walls of boiler pipes from scale and deposits, consisting of the most common compounds in Russia - iron oxide and hardness salts. That is, acid washing of the boiler gives you the following advantages compared to other types of boiler cleaning:

• flushing the boiler gives a reduction in fuel and electricity consumption at a level of 10%;
• flushing the boiler gives an increase in the overhaul period of the boiler;
• flushing the boiler improves the environmental situation of the air basin
• chemical boiler flushing is a practical and inexpensive way to carry out a boiler flushing according to the manufacturer's recommendations, and at the same time, with minimal cost and maximum efficiency.

At the same time, it is necessary to understand that chemical washing of boilers, despite its seeming simplicity, is a rather complex technical operation associated with working with caustic materials and specialized technical equipment. We urge you to be more careful when choosing contractors for chemical washing of the boiler.

We also carry out a full range of heating system maintenance, heating system repair, heat exchanger cleaning, preparation for the heating season, pressure testing, heating system flushing, coolant replacement, boiler maintenance and repair.

Fluids for flushing heat exchangers

Regardless of the cleaning method you choose, you will need a flush reagent. The choice of flushing liquid should be wise, as some of them can damage and even disable the heat exchanger of your gas boiler. Let's consider in what cases certain solutions are suitable:

Hydrochloric acid

To clean heat exchangers made of copper or stainless steel, an aqueous solution of hydrochloric acid with a concentration of 2-5% is successfully used. Special additives, inhibitors, help protect the metal without preventing the dissolution of oxides and carbonates. Washing with hydrochloric acid is the lot of professionals who are aware of their actions when working with this aggressive reagent. Independently, at home, it is highly not recommended to clean the gas boiler heat exchanger with this tool without a clear understanding of the ongoing processes.

Sulfamic acid

Washing the heat exchanger with sulfamic acid is particularly effective in removing deposits containing metal oxides. This cleaner is safe for all materials and can be used successfully at home. The composition for washing the heat exchanger includes a 2-3% aqueous solution of sulfamic acid and corrosion inhibitors.

Photo 5: Flushing the plate heat exchanger

Orthophosphoric acid

Flushing with orthophosphoric acid is effective for heat exchangers of gas boilers of all types. This cleaning agent not only perfectly removes scale and dirt, but also does not cause any harm to the metal and even creates protective film. To obtain an effective regent, it is necessary to dilute phosphoric acid in water to obtain a 13% solution.

Lemon acid

Solution citric acid at a temperature of 60°C perfectly removes scale and oxidation, while not affecting the metal of the heat exchanger. This product is great for cleaning copper, brass and stainless steel devices. Depending on the degree of contamination, the recommended concentration is from 0.5 to 1.5%.

Flushing liquid "Detex"

Detex flushing agent is used to remove scale, oxides, salts and various biological deposits from the walls of cast iron, steel and copper heat exchangers. Due to the content of surfactants and corrosion inhibitor additives, it protects the metal, thereby increasing the service life. heating equipment. Depending on the degree of contamination, the Detex concentrate is diluted with water in a ratio of 1/6 - 1/10 and poured into the washing machine.

Photo 6: Industrial Tools for flushing the heat exchanger

The process of circulation of the flushing liquid through the heat exchanger of the gas boiler is accompanied by gas evolution, the stop of which indicates the end of the action of the reagent. If the required flushing quality is not achieved, increase the Detex concentration until the gas formation process resumes and continue the cleaning procedure. At the final stage, it is necessary to flush the heat exchanger with a neutralizing liquid, and then with water.

Do-it-yourself long-burning boiler drawings on coal