Why do heat exchanger tubes scale? How to descale?

This is due to the fact that there are a certain amount of calcium and magnesium salts dissolved in the water, such as bicarbonate, carbonate, sulfate, chloride, silicate, phosphate, etc., as well as sediment and organic matter. These salts undergo physical and chemical changes during heating to form scale. Usually the main components of limescale are calcium carbonate and calcium phosphate.

There are also a certain amount of calcium sulfate, calcium silicate and other inorganic salts dissolved in water, with the evaporation of water, their concentration in the water increases, when its concentration exceeds the solubility, it will also produce precipitation, and deposit on the heat transfer surface.

The method of removing scale is to clean by a high-pressure water jet that is commonly used at present, and the scale is washed down by using high-kinetic water flow, which is green and pollution-free. For the scale that cannot be removed by the high-pressure water gun or is not easy to operate, it can be cleaned by chemical methods, and the cleaning solution is prepared to let him react with the scale to achieve the purpose of descaling.

Of course, the water in your heat exchanger can also be treated with some anti-scaling treatment, such as water treatment equipment to reduce ionic impurities in the water. It is okay to add some antiscalant to prevent scaling.

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The addition of polyphosphate buffers to the cooling water can also lead to the precipitation of limescale when the pH value of the water is high. The scale formed at the beginning is relatively soft, but with the formation of the scale layer, the heat transfer conditions deteriorate, the crystal water in the scale is gradually lost, and the scale layer becomes hard and firmly adheres to the surface of the heat exchange tube.

In addition, like scale, when the working conditions of the heat exchanger are suitable for the solution to precipitate crystals, the scale layer formed by the crystallization of the material can accumulate on the surface of the heat exchanger tube; When the fluid contains more mechanical impurities and organic matter, and the flow rate of the fluid is small, some mechanical impurities or organic matter will also be deposited in the heat exchanger, forming loose, porous or colloidal fouling. Revise.

1.Wash: pickling.

Before that, the heat exchanger is washed openly, so that there are no impurities such as mud and scale inside the heat exchanger.

2.The cleaning solution is poured into the cleaning equipment before being injected into the heat exchanger.

3.Pickling: The heat exchanger filled with acid solution is statically soaked for 2h. Then continuous dynamic cycle for 3 4 h.

4.Caustic washing: After pickling, use NaOH, Na, PO, softened water.

Prepare it in a certain proportion.

The most common thermal equipment that needs to be cleaned regularly is a heat exchanger, which is a thermal equipment that realizes the heat exchange between two different temperature media.

According to the principle of action, heat exchangers can be divided into regenerative heat exchangers and regenerative heat exchangers. In a recuperative heat exchanger, the flowing heat carrier is separated by a separator, which is the case with most heat exchangers. In a regenerative heat exchanger, the heat and cold carriers are in contact with the same surface in turn, and the heat is in that surface area when in contact with the heat carrier.

The accumulated heat is released from the surface when it comes into contact with the cold carrier.

The process of using a heat exchanger can cause serious fouling problems at the heat exchange site. Regardless of the structure of the heat exchanger, uncontrollable fouling will occur.

Why Choose the ET-W Series Descaler for Heat Exchanger Descaling?

A heat exchanger is a complex thermal technology device, and the efficiency of the heat exchanger is efficient.

And the service life of no maintenance depends on how it is properly cleaned. The latest innovative and high-tech heat exchanger descaling method is based on the use of a certain ferrofluid.

RF impulse signals at dynamic frequencies that efficiently clean the heat exchanger. Eliminate the need to disassemble the heat exchanger with chemical cleanup or mechanical decontamination, and stop its work during purification.

The ET-W series descaler is capable of descaling the heat exchanger during its operation. You don't have to shut down and disassemble the heat exchanger in order to clean it, the heat exchanger is always in the process of cleaning, and the formation of limescale and deposits is almost zero.

The ET-W series descaler produces a powerful RF impulse resonance signal with a certain magnetohydrodynamic resonance frequency, which propagates along all heat exchange surfaces, destroying and removing deposits that have formed. The resonance pulse is concentrated throughout the heat carrier, in which case the hard salts and other forms of deposited molecular structure in the heat carrier flow are changed, and the ability to precipitate and form solid deposits in the heat exchange section is lost when it comes into contact with the heat exchange surface.

The ET-W series descaler cleans the heat exchanger of various structures without stopping the work of the heat exchanger and without dismantling, and the role of the instrument also ensures that the formation of scale and deposits on the heat exchange surface is effectively prevented. That is, the appearance and growth of new scale (deposits) is not allowed. With the help of cleaning the heat exchanger, the ET-W series descaler increases the efficiency of the heat exchanger by 26-30%.

1. Pickling method. Hydrochloric acid, phosphoric acid can be used to remove dirt from the inside of the water heater, and hydrochloric acid can be used to clean carbonate scale, magnesium chloride generated during pickling.

and calcium chloride solubility.

It is large and easy to remove. Before using the pickling water heater, we need to accurately calculate the usage and dosage of hydrochloric acid according to the degree of dirt in the water heater.

2. Use descaler. The descaler can quickly dissolve the scale in the water heater, and at the same time, it can also eliminate the odor in the water heater, and after using this method, you will feel that the water heater heating speed is significantly faster, and the water inside the water heater becomes cleaner.

3. Alkali washing method. The effect of removing limescale from the water heater with alkali is also good, mainly to remove sulfate.

and silicate scale, it can also remove mixed scale of sulfate and silicate. After dissolving the scale with lye, you can remove the scale on the water heater by cleaning it with a brush, and if the scale is very hard, you can use a knife to scrape it off slowly.

If you want to remove people, if it is a water tank in the water heater exchange center, then you can open the lids on both sides and remove them from the lid in the middle, or you can use the high heat and wash it with dish soap.

How do you remove limescale from a gas water heater? I think to remove the scale of the gas water heater to remove the water heater, release two potato slices, add two more potato slices, and put some vinegar so that it can be washed off.

The scale in the vapor exchanger I think this should be able to use some dilute hydrochloric acid, this should be better for a clear, this should also be relatively good, or can use some that should also be better clear of a scale in him.

The scale inside the gas water heater should be removed once every 2 to 3 years, otherwise it is very dangerous.

And it is particularly electricity-intensive, in this case you should find a professional.

There are several ways to do this:

1. Manual or mechanical methods.

When there is a slight blockage and fouling in the pipe bundle, it is cleaned with the help of tools such as shoveling and wire brushes.

2. High-pressure water gun flushing method.

Different rotating water gun heads are used for different heat exchangers, which can be rigid or winding, and the pressure can be adjusted freely from 10MPa to 200MPa.

Search: iceberg descaling, you'll understand.

Tubular heat exchanger scale cleaning refers to the removal of scale deposited in the tubular heat exchanger to ensure its normal operation and efficient heat exchange. The cleaning steps are as follows:1

Turn off the tubular heat exchanger and drain the internal moisture. 2.Inspect pipes for leaks or damage.

3.Use a detergent or pickling agent to thoroughly clean the inside of the tubular heat exchanger. The detergent can be a specialized detergent or an acidic detergent such as citric acid, acetic acid, etc.

Be careful to follow the manufacturer's recommendations when choosing a cleaning agent. 4.Pour the cleaner into the pipe and wait for some time for the cleaner to take full effect.

The length of time depends on the type of ridge of the cleaner and the extent of the pipe. 5.Rinse the pipe with clean water until the cleaning agent is completely rinsed.

6.Check that the pipes are cleaned, and drain the cleaning solution and clean water. 7.

Double-check the pipes for damage or leaks. 8.Turn on the tubular heat exchanger and run it to test it to make sure it's functioning properly.

Notes:1Wear protective equipment such as gloves and protective glasses when cleaning.

2.During the cleaning process, avoid cleaning agents or clean water from entering the electrical components. 3.

The cleaning agent should be properly disposed of after use, and the trousers should be infiltrated to avoid pure pollution to the environment.

Hello dear. The specific steps of scale cleaning of heat exchanger are as follows: 1. Prepare cleaning agent and equipment to prepare appropriate cleaning agent, cleaning agent is composed of water-soluble organic solvent and alkaline additives, and at the same time prepare cleaning equipment, such as water pumps, sprinklers, cleaning containers, etc.

2. Before cleaning, prepare to close the hot water valve of the heat exchanger and release the internal water of the heat exchanger; Connect the sprinkler to the outlet of the heat exchanger; Add the cleaning agent to the heat exchanger. 3. Start cleaning the stool and wash the water pump to mix the cleaning agent, jujube, lead hail and water, and spray the mixed liquid into the heat exchanger; The cleaning liquid is circulated so that the cleaning agent can fully penetrate the inside of the heat exchanger; After washing, rinse off the detergent with clean water. 4. After cleaning, check whether the inside of the heat exchanger is clean by hand or pressure, check whether the inside of the heat exchanger is worn, and check whether the connection of the heat exchanger is leaking.

5. Complete the cleaning of the heat exchanger, clean the outside of the heat exchanger with clean water, wipe the appearance with a cleaning cloth, and then open the hot water valve of the heat exchanger, and wait for the internal temperature of the heat exchanger to rise to the normal working temperature; Finally, the heat exchanger is ready to work after it has completed the temperature increase.

Summary. Tubular heat exchanger is also called shell-and-tube or tubular heat exchanger in daily life, which is a very typical partition-type heat exchanger, which is a very long and classic in the history of industrial manufacturing, and the tubular heat exchanger is still in a dominant position in China's heat exchanger. The general tubular heat exchanger is composed of four parts: the shell, the tube bundle, the tube sheet and the head, and our most common shell is round, and there are many parallel tube bundles inside this large circle, and the two ends of the tube bundle are fixed on the above tube sheet.

Hello, dear We are happy to answer for you: the scale cleaning method of tubular heat exchanger is as follows. 1. Large-scale resale stuffy heater cleaning, if the scaling is serious, clean with high-pressure water.

2. The small car is cleaned with chemical reagents, available on the market, or you can prepare it yourself, and the main ingredients are washed with water after being cleaned with corrosion inhibitors, acids and water reagents.

Tubular heat exchanger is also called shell-and-tube or tubular heat exchanger in daily life, which is a very typical wall heat exchanger, Nianshi Town has a very long history of industrial manufacturing and is a classic, and the tubular heat exchanger is still in a dominant position in China's heat exchanger. The general tubular heat exchanger is composed of four parts: shell, tube bundle, tube sheet and head, and our most common shell is round, and there are many parallel tube bundles inside this thick circle, and the two ends of the tube bundle are fixed on the above-mentioned tube sheet.

The specific steps of scale cleaning of heat exchanger are as follows: 1. Prepare cleaning agent and equipment to prepare appropriate cleaning agent, cleaning agent is composed of water-soluble organic solvent and alkaline additives, and at the same time prepare cleaning equipment, such as water pumps, sprinklers, cleaning containers, etc.

2. Before cleaning, prepare to close the hot water valve of the heat exchanger and release the internal water of the heat exchanger; Connect the sprinkler to the outlet of the heat exchanger; Add the cleaning agent to the slag changer and reed heater. 3. Start cleaning:

The cleaning agent and water are mixed with a water pump, and the mixture is sprayed inside the heat exchanger; The cleaning liquid is circulated so that the cleaning agent can fully penetrate the inside of the heat exchanger; After washing, rinse off the detergent with clean water. 4. Check after cleaning: check whether the inside of the heat exchanger is clean by hand or by pressure; Check the inside of the heat exchanger for wear; Check the connectors of the heat exchanger for leaks.

5. Complete the cleaning of the heat exchanger: clean the outside of the heat exchanger with clean water, and wipe the appearance clean with a clean cloth; Then open the hot water valve of the heat exchanger and wait for the internal temperature of the heat exchanger to rise to the normal working temperature; Finally, the heat exchanger is ready to work after it has completed the temperature increase.