The auxiliary cooling of many conventional thermal power plants requires the use of plate heat exchangers, boilers for district heating, oil industry for heating and cooling synthetic detergent, whale oil for heating, vegetable oil for cooling, sodium hydroxide for cooling, glycerin and emulsified oil for cooling. Electric power industry generator shaft pump cooling, transformer oil cooling. Marine diesel engine, central cooler, jacket water cooler, piston cooler, lubricating oil cooler, preheater, seawater desalination system (including multi-stage and single-stage) and other medical, petroleum, ceramics, glass, cement, geothermal utilization, etc. Many conventional thermal power plants need plate heat exchanger for auxiliary cooling ● most of them are used to remove heat generated by friction from auxiliary system ● the main demand is liquid-liquid heat exchanger, i.e. water water, glycol water for sealing gasket of Beijing heat exchanger, And oil-water ● in the auxiliary system, the design pressure is rarely higher than 1.0 MPa ● typical application design temperature is usually between 49 ℃ and 100 ℃ ● central cooling, vacuum pump cooling, generator cooling, feed pump lubricating oil cooling, closed-circuit water cooling, turbine lubricating oil cooling, drainage cooling (heat recovery), jacket and valve water cooling, Stuffing box seal oil cooling, seal pipe oil cooling, air conditioning compressor cooling, emergency diesel engine cooling, hydropower station, turbine lubricating oil cooling, bottom control system cooler, nuclear power station, nuclear free area - same as conventional thermal power plant, Nuclear area - nuclear area reactor, etc. - retarder cooler - fuel cell cooling and purification system - shell and condensate pool cooling - core emergency cooling - waste treatment system - neutron shield cooling - emergency standby cooling, turbine lubricating oil cooling, liquid bottom control system cooler, heat exchanger is mainly used in the marine industry for central cooling, jacket water cooling, Heat exchangers in power industry are mainly used in open or closed circulating water cooling, transmission oil cooling, turbine oil cooling, lubricating oil cooling, piston and turbine and engine coolant cooling, and heat recovery of diesel power station, Waste heat recovery, the pharmaceutical industry heat exchanger in the pharmaceutical industry is mainly used for drug sterilization, emulsion cooling, suspension heating, plasma heating, citric acid heating, infusion cooling, etc., the iron and steel industry heat exchanger in the steel industry is mainly used in mold / caster coolant cooling.