Removable plate heat exchanger cleaning method can not only maintain the normal production of plate heat exchanger manufacturing, but also can reduce production accidents and its energy consumption. Therefore mastering the plate heat exchanger cleaning method is very necessary, today to share a related plate heat exchanger cleaning method what it? Plate heat exchanger as a high-efficiency, close thermal equipment, heat transfer inside the high ambient temperature, small diameter of commodity circulation, so often occurs in the accumulation of scale, it will endanger the heat transfer work and its operational safety, for plate heat exchanger cleaning methods and its maintenance work must be done.
A, analysis of scale, symptomatic treatment
1. Analysis of scale accumulation How does scale accumulation occur? Generally is the water in a variety of salts subject to decomposition reaction, and gradually perfect crystals attached to the thermal conductivity of the above, common salt compounds are: polyphosphate, sulfide, aluminum silicate, potassium thiocyanate, etc., the characteristics of this species is mainly hard material, more difficult to eliminate.
2. Stains are some gravel, dust, fine sand, transparent liquid, leachate, oil, algae and other materials relatively loose chemical substances, the volume is large, very easy to eliminate.
3. plate heat exchanger plate heat exchanger heat transfer method is often divided into water - water heat transfer, steam - water heat transfer. Let's start with water vapor exchange, water gas exchange is generally water and water vapor, the chances of accumulation of scale are small, the ambient temperature of the cold medium at 90 ℃, the chances of accumulation of scale (stains, dirt) are large, and generally more dirt; lubricated heat exchanger material is generally water, and cold water hot water temperature error is small, the category in: 70-90 ℃ up and down, the accumulation of scale are relatively similar.
Second, the selection of plate heat exchanger cleaning methods and its processing process accumulated scale material hard: with physical methods certainly can not, the general choice of chemical water treatment in the pickling passivation scale cleaning, the actual to be based on the level of embrittlement, user needs, the accumulation of scale conditions, etc. development, can be divided into two kinds of demountable and can not be demounted.
Can be removed will undoubtedly clean up in a timely manner, clean up more completely, but staff costs increase, the processing process is complicated, there will also lead to the probability of heat exchanger infiltration.
Therefore, chemical water treatment can be divided into: circulating system cleaning and its immersion cleaning closely combined way, circulating system cleaning is the use of circulation to carry out cleaning, the key consists of the following components: plastic hose, cleaning tank, circulating water pump can be, the cleaning fluid into the cycle, carry out cleaning, and soak to the cleaning fluid to reach a certain concentration value, to turn off the circulating water pump to carry out immersion.
But we should pay special attention to the plate heat exchanger chemical water treatment of common problems and their processes are many, must be carefully read a look, and then carry out clean-up! Plate heat exchanger cleaning method three, select cleaning agent general plate heat exchanger plate common for Austenitic stainless steel plate, is necessary to special type of cleaning agent to carry out cleaning, and sealing gasket material is generally ethylene propylene rubber, nitrile rubber, etc. has good acid resistance, alkali resistance, alcohol and other organic substances of modern cities, so choose the right cleaner.
Three, plate heat exchanger cleanup way process
1. chemical water treatment cycle connection will be hot medium entrance and exit gate valve, cold material import and export trade gate valve are turned off, the inside of the material out, looking for hot and cold medium seepage sewage mouth put cleaning agent, wastewater entrance and exit for cleaning agent drainage mouth, the order is:, according to the hot material import - hot material entrance and exit - cold material import -Cold substance inlet and outlet sequence.
2. chemical water treatment cleaning tank irrigation check system software circulation system routine after adding cleaning agent, start running, every one a little time once the concentration value of cleaning agent (0.1-0.15 mol/L range) according to the precise measurement of the standard value plus cleaning agent, do not disassemble the heat exchanger cleaning situation to pay attention to a longer period of time, the use of circulating system emergency and its soak immersion method like fusion, cleaning agent concentration value if Continuously 2 hours will not change outdated changes in the process of the amount of less can be terminated circulation system.
3. cleaning plate heat exchanger clean up after the end of the heat exchanger inside the flow mouth is relatively small, there will be scale slag adhering to the plate, is necessary to circulate the pump to carry out continuous cleaning, the cleaning tank body of sewage out, filled with water, the use of circulating water pump to carry out cleaning view check, until the drainage pipe neat cut off.
