Why does boiler soft water fail in two days?
Because of the different working pressure of the boiler, the water quality requirements and control methods are different. The higher the work pressure, the higher the water quality requirements, the more stringent control. Water quality control is the purpose of fouling and corrosion on the boiler and auxiliary steam and water system, ensure the steam quality, the safe operation of steam turbine, and in the above conditions, reduce pollution loss of boiler, improve economic efficiency. Low pressure boiler can be treated in the water of furnace, but the method of water treatment is usually adopted to soften water as a make-up water. Medium pressure boilers and some high-pressure boilers usually use demineralized water as the make-up water after removing alkali, removing silicon, desalting and sodium ion exchange (medium pressure boiler). Phosphate treatment is mainly used in the furnace. For high pressure and subcritical drum boilers, chemical desalting is now normally used, while phosphate treatment or volatile treatment is used in the furnace. For direct current boilers, volatile treatment must be adopted. In addition, the dissolved oxygen, water treatment in boiler water of SiO2 and salinity, pH value regulation, but also because the boiler pressure increases more stringent requirements.
Process for preparing desalted water equipment in large power plant1, the use of ion exchange, the process is as follows:The raw water, raw water pump, multi medium filter, activated carbon filter, water softener, precision filter, filter bed, Yin Yang resin resin filter bed, mixed bed resin microporous filter, yin and Yang, water.2, the use of reverse osmosis + mixed bed, the process is as follows:Tap water pipe network, water pump, dosing flocculation, mechanical filter, activated carbon filter, filter, scale, dosing pump, high pressure reverse osmosis device, water tank, pump and mixed bed mixed bed device, precision filter, demineralized water tank.3, adopt EDI way, its process is as follows:Raw water, raw water pressure pump, multi medium filter, activated carbon filter, water softener, precision filter, level one reverse osmosis machine, intermediate water tank, intermediate water pump, EDI system, microporous filter, water point.
The parameters, specifications, low pressure, medium pressure, high pressure and super high pressure boiler of large power plant are divided by the pressure difference of steam produced by boiler. According to the table, the pressure rating is as follows: low pressure boiler: <2.45Mpa (<25kgf/cm2) medium pressure boiler: 3.82-5.78Mpa (39-59kgf/cm2)
