Effect of softening treatment on heat exchanger unit

The heat exchanger unit mainly includes dew point corrosion, abrasion, microbial corrosion, etc. For example, dew point corrosion can be caused by the contact of hot steam containing acidic substances with cold plates; When the flow velocity at the corner hole of the medium inlet and the diversion area of the plate is too high, or the fluid contains sand particles, it can lead to abrasion; Algae, bacteria and protozoa in seawater can lead to microbial corrosion of plates. Among the above corrosion failures, stress corrosion cracking of Cr Ni austenitic stainless steel accounts for about 50%, pitting corrosion and crevice corrosion account for about 20%. If there is leakage between plates, it may lead to poor heat exchange effect and affect subsequent production and processing, or it may lead to the stop of heat exchanger and directly affect our production plan. Therefore, we should regularly clean and maintain the heat exchanger according to the working conditions. If industrial equipment Co., Ltd. uses sewage as cooling medium, or recovers waste heat of sewage, or the medium contains granular solids, a filter or decontaminator shall be installed at the inlet end of the heat exchanger to avoid blocking the heat exchanger.

When the temperature of cooling water (heated) exceeds 40 ℃, softening treatment shall be carried out as far as possible to avoid scaling of heat exchange unit and affecting heat transfer effect. Start up after completing the above work. Start the pump of cold and hot medium first, slowly open the inlet valve of cold medium, and then open the inlet valve of hot medium to make the medium slowly flow into the heat exchanger to avoid excessive temperature. Normal operation and inspection 1. Regularly check all sealing surfaces and welds of the heat exchanger to observe whether there are abnormal phenomena such as leakage. If leakage is found, mark the leakage in time and deal with it after shutdown. During shutdown, slowly close the inlet valves of hot and cold media, and then close the outlet valves of the two media. On the contrary, open the outlet valve first, and then slowly open the inlet valve. The medium on the low-pressure side shall be tested regularly to avoid mixing with the medium on the high-pressure side. If there is any mixing, it indicates that internal leakage occurs and the machine shall be shut down for treatment. The condensed water is fully recovered and recycled, and the water in the whole system is self-cleaning and anti scaling. The heat exchanger, radiator and heat exchange system can maintain long-term, stable and efficient heat exchange performance, Zui greatly reduce the scaling phenomenon of the system, and will not reduce the heat exchange efficiency of the system due to the insurmountable scaling disadvantages. The heat exchanger is made of all stainless steel, with scientific product structure design, excellent production and long service life, up to more than 20 years. The key components are processed by German advanced technology and orders, so the main engine is not affected by steam pressure and system pressure, effectively eliminates noise and steam hammer, and the whole machine runs smoothly.