Descaling And Anti-fouling Treatment Of Evaporator

The evaporator is mainly composed of a heating chamber and an evaporation chamber. The heating chamber provides the liquid with the heat required for vaporization, and promotes the liquid to boil and vaporize; the vaporization chamber completely separates the gas-liquid two phases. The circulating cooling water of the evaporator contains a large amount of salts, corrosion products and various microorganisms. Due to the lack of water treatment, a large amount of calcium and magnesium carbonate scale, algae and microorganisms will form on the water side of the evaporator after a period of operation. Sludge, sticky mud, etc., these dirt are firmly attached to the inner surface of the copper tube, which leads to the deterioration of heat transfer, the increase of circulating pressure, and the reduction of the vacuum degree of the unit, which affects the operation efficiency of the unit and causes great economic losses. So we need to descale the evaporator for better use! Evaporator descaling preparations: 1. Disconnect other systems unrelated to the evaporator. 2. In order to monitor the cleaning effect of the system and the corrosion of the equipment during the cleaning process, before the cleaning construction, the standard corrosion test piece equivalent to the material of the equipment and the monitoring pipe section are respectively suspended in the cleaning tank. 3. Open the high-point vent valve on the water side of the evaporator and the low-point guide valve on the steam side to ensure that a large amount of gas generated during the cleaning process can be discharged in time and the fullness of the cleaning solution; at the same time, the guide valve is used to monitor the cleaning process. Heater copper tube leakage. Anti-scaling treatment of evaporator 1. Set up pre-cooler in the evaporator and air cooler, so that the evaporation temperature of the tube surface of the evaporator is below 40 ℃. It is always covered by a water film, and there is no drying point. Setting up a pre-cooler and preventing the occurrence of dry-up points have preventive effects on the scaling problem of evaporators and air coolers. 2. Carry out pre-film and anti-scaling treatment during the manufacture of the evaporator. When making the evaporator, the use of pre-film and anti-scaling can form a protective film on the pipe surface of the evaporator and the air cooler, which can effectively prevent the fouling crystals from adhering to the surface of the copper pipe, reduce the possibility of scaling of the evaporator, and prolong the evaporator and air cooler. structural cycle. 3. A small amount of continuous drainage device is used to control the concentration ratio of calcium ions in the cooling circulating water of the evaporator and the air cooler within a certain range, effectively preventing the precipitation of scale. Reducing the calcium ion content in the cooling circulating water of the evaporator, the air cooler and the closed cooling tower is the best way to control the scaling problem.