Who knows the descaling method of stainless steel plate heat exchanger

I have a condensate-injected plate here, do you need it?

There are many cases where the radiator is not hot and the hot water is not running smoothly due to the blockage of the heating pipe, and the scaling of the heating is one of the main reasons for this state. For the independent heating method of the family, how to effectively prevent the heating chip scale and avoid the phenomenon that the radiator is not hot? Radiator companies say that heating users can easily learn two ways to quickly solve the problem of radiator fouling.

In our daily life, we often find that after the radiator has been used for a long time, there will be scale on the inner wall that is difficult to remove. So, how does limescale form? As a terminal device for heat dissipation, the radiator pipe flows with 60-70 hot water, and sometimes the water temperature is even as high as 90 or more.

Water contains minerals such as calcium and magnesium, and in the process of thermal reaction, calcium carbonate, magnesium hydroxide and other substances precipitate and adhere to the inner wall of the radiator, which is what we commonly call grinding scale. Therefore, after many radiators are used for a period of time, there will be scaling on the pipes.

1.Use radiator antiscalant, which is a combination of alkaline and organic substances. The alkaline substance in the antiscalant makes the calcium and magnesium salts in the water of the radiator pipeline form water slag, and the water slag is removed through the sewage discharge, so as to remove the calcium and magnesium ions in the water, so that it cannot form scale.

At the same time, the organic matter in the radiator antiscalant will also increase the fluidity of the water residue, making it easy to discharge, and form a barrier layer on the metal surface to prevent the formation of scale on the inner wall of the radiator.

2.Increase the number of radiator pieces or groups, and achieve low-temperature heating through this method, so that the temperature of hot water in the radiator pipe is reduced, which is not conducive to the precipitation and precipitation of calcium carbonate, magnesium hydroxide and other substances, and will not form scale on the radiator pipe. If you choose a radiator with better internal anti-corrosion treatment, the effect of preventing scaling of the radiator will be better, because the anti-corrosion coating of the radiator reduces the adhesion of the inner wall, and there is no place where minerals such as calcium and magnesium are attached, and the radiator is not easy to scale.

Of course, if there is scaling in the radiators, boilers and pipes at home, users can find a professional descaling company to remove the scale, and they can easily remove the scale in the heating without doing it themselves, so that the heating system can run smoothly and the radiators heat up. If you have the knowledge you want to know about HVAC, you can also send a private message to Fengdu, and Fengdu will continue to provide you with more radiator knowledge.

Due to the inevitable scale condensation during the heat exchange process, the plate heat exchanger must be cleaned in time, resulting in a decrease in heat exchange efficiency and an increase in energy consumption.

The descaling method of plate heat exchanger, the general enterprise is achieved by disassembling manual brushing, and some enterprises also achieve circulating cleaning through cleaning agent and circulating pump, but the condition here is: the cleaning agent must be extremely low corrosion rate, because the plate heat exchanger is more delicate, once the cleaning leakage, the heat exchanger plate will be scrapped and updated, and it cannot be welded, so it can be cleaned by itself, but we must choose a good cleaning agent, we use the Fushitech environmental protection cleaning agent, the corrosion rate is quite low, and even the first None of them corroded.

Plate and shell heat exchangers are characterized by high heat transfer efficiency. Generally, when the equipment is overhauled, it is found that a large number of debris, rags, stones and other debris are accumulated on the plate bundle at the circulating inlet of the medium plate and shell heat exchanger. Then the equipment is blocked and scaled.

Part of the gap between the plate and tube is blocked by slime and scale; Moreover, there are microorganisms in the heat exchanger, sometimes accompanied by foul odor, resulting in the reduction and serious uneven distribution of circulating water through the plate, and the heat exchange efficiency is reduced, which affects the safety of production.

The scale of the heat exchanger is generally carbonate scale, and according to the characteristics of the plate and shell heat exchanger, the pressure drop of the plate and shell heat exchanger in actual operation is smaller. The cleaning operation should be stable to prevent the plate from being deformed and damaged due to sudden cooling, sudden heating, impact, etc., and it is very important to choose a scientific and effective heat exchanger cleaning process.

Hangzhou Guanjie Industrial Cleaning Water Treatment Technology specializes in heat exchanger cleaning, plate and shell heat exchanger cleaning, shell and tube heat exchanger cleaning, spiral heat exchanger cleaning, etc. For the cleaning of various heat exchangers, Hangzhou Guanjie has many years of experience in cleaning heat exchangers, professional heat exchanger cleaning technology, and provides high clarity and low corrosion heat exchanger cleaning services.

If it is found that the cooling effect of the heat exchanger decreases, and the pressure drop of the inlet and outlet water increases significantly, it means that the water side of the gas cooler needs to be cleaned. If the pressure drop on the gas side increases significantly, then the gas side of the gas cooler needs to be cleaned.

1) Cleaning on the water side.

a Mechanical cleaning.

The water side should be cleaned regularly, when cleaning, close the valve of the inlet pipe, unscrew the drain plug, let go of the water in the gas cooler, remove the inlet and outlet end cover, return end cover, and then use a pipe brush (with water) to scrub the inner wall of the pipe, and the dirt under the brush is washed out of the pipe with water.

b Chemical cleaning.

If the fouling on the inner wall of the pipe cannot be removed after mechanical cleaning, or if there is only limescale on the water side of the gas cooler and there is no large residue and dirt, chemical cleaning can be used. To make a cleaning system (the system needs a pump, corresponding pipes and necessary valves), it is not necessary to remove the air cooler, only disconnect the external cooling water pipe of the air cooler, and connect the cleaning system directly to the inlet and outlet flanges of the air cooler, so that the cleaning liquid circulates in the gas gas cooler, so as to realize the cleaning of the water side of the gas cooler (the flow direction of the cleaning liquid is best the opposite of the flow direction of the cooling water).

The cleaning solution can be 10% hydrochloric acid plus antioxidant, we recommend using the "HS-2 boiler and large equipment cleaning agent" of Yangyuan Detergent Factory (Pudong New Area) of Shanghai Daluo Industry and Trade Industrial Company, and the specific use method is detailed in the manufacturer's instruction manual.

After cleaning, the gas cooler should be flushed with a strong jet of water until it is thoroughly cleaned.

2) Cleaning of the air side.

If the fin of the core group is greasy and thick, use needle-nosed tweezers or a brush to remove the coarse dirt on the cleaning air side, and then put the core group into the cleaning solution to clean, such as hot alkaline water, special detergent or cleaning agent, it is recommended to use the "HU-10 strong oily sewage-based cleaning agent" of Yangyuan Detergent Factory (Pudong New Area) of Shanghai Daluo Industry and Trade Industry Co., Ltd. for details of the manufacturer's instruction manual.

After cleaning, the cooling core should be fully rinsed with clean water, and it is recommended to use a high-pressure jet gun with a 3mm nozzle, which is a high-pressure water pipe 2m away from the heat sink to impact the fin group vertically, that is, the jet water flow is parallel to the heat sink, and then dry with compressed air after washing.

3) Cleaning is complete.

After the parts are installed according to the general drawing, the pressure test should be carried out in accordance with the pressure test requirements specified in the drawings. Water side: test water pressure, pressure, no leakage for 30 minutes; Air side: test air pressure, pressure, no leakage for 10min.

The heat exchangers we use on site are all done like this, but the general cycle of the heat exchanger is very long, sometimes it has not been cleaned for several years, you can consult whether the heat exchanger manufacturer you use has a recommended cleaning agent, if not, you can use the above methods, if there is a recommended brand recommended by the manufacturer.

Plate heat exchanger cleaning includes physical cleaning of plate heat exchanger (high-pressure water jet cleaning) and chemical cleaning of plate heat exchanger (pickling and passivation). You need to do a chemical cleaning, you first need to do a dog-like analysis, like you said that the gutter is very hard, you can basically rule out carbonate scale, it may be silicate scale or sulfate scale, or other composite scale. The choice of which pickling method to use needs to be determined after the analysis of the scale sample, and the cleaning chemical cleaning of the plate heat exchanger is a characteristic project, which requires certain qualifications.

Only with this can construction be carried out.

It is easy to damage the protective film on the surface with descaling agent, and it is not thorough enough to clean with air blowing, I know that the ultrasonic descaling and anti-scaling equipment produced by a Hitop company is very good, you can contact us to try it.

The methods are: backwashing, disassembling hand washing and solvent washing, and paying attention not to use steel brushes when hand washing, so as not to damage the passivation film.

See if it's detachable or not. Detachable, wash directly; Do not disassemble, blow it with air.

Passivation method of austenitic stainless steel (in a solution of nitric acid at a concentration of 300 500 g L and sodium bicomplex acid "Na2Cr3O7" at a concentration of 20 30 g L, at room temperature, soaked for 30 60 minutes, a Cr2O3 passivation protective film is formed on the surface. However, liquids containing chloride ions (salt water, hydrochloric acid, iodine-containing or chlorine-containing disinfectants) can have a damaging effect on the passivation film, which can exacerbate corrosion.