16 May 2020

Function of Plate Heat Exchanger

16 May 2020

Plate heat exchanger is a new type of high efficiency heat exchanger which is composed of a series of corrugated metal sheets. A thin rectangular channel is formed between various plates, through which heat is exchanged. Plate heat exchanger is an ideal equipment for heat exchange between liquid and steam. The utility model has the advantages of high heat exchange efficiency, small heat loss, compact and light structure, small floor area, convenient installation and cleaning, wide application, long service life, etc. Under the same pressure loss, the heat transfer coefficient is 3-5 times higher than that of the tube heat exchanger, the floor area is one third of the tube heat exchanger, and the heat recovery rate can be as high as 90%.

Plate type heat exchanger consists of plate heat exchanger, balance tank, centrifugal sanitary pump, hot water device (including steam pipeline, hot water injector), bracket and instrument box. It is used for sterilizing and cooling milk or other thermosensitive liquid. The materials to be treated shall be first put into the balance tank, then sent to the heat exchanger by the centrifugal sanitary pump, and then preheated, sterilized, insulated and cooled. If the materials do not reach the sterilization temperature, the pneumatic return valve controlled by the instrument shall be used for reversing and then returned to the balance tank for reprocessing. The sterilization temperature of materials is automatically controlled and continuously recorded by the instrument control box, so as to monitor and inspect the sterilization process. There are two types of plate heat exchanger: frame type (detachable) and brazed type. There are three types of plate: herringbone corrugated plate, horizontal flat corrugated plate and nodular plate.


a. Refrigeration: used as condenser and evaporator.

b. Heating, ventilation and air conditioning: the intermediate heat exchanger used with the boiler, the intermediate heat exchanger of high-rise buildings, etc.

c. Chemical industry: soda industry, ammonia synthesis, alcohol fermentation, resin synthesis cooling, etc.

d. Metallurgical Industry: heating or cooling of aluminate mother liquor, cooling of steelmaking process, etc.

e. Mechanical industry: all kinds of quenching liquid cooling, reducer lubricating oil cooling, etc.

f. Power industry: high voltage transformer oil cooling, generator bearing oil cooling, etc.

g. Paper industry: heat recovery of bleaching process, heating and washing of slurry, etc.

h. Textile industry: viscose filament alkaline solution cooling, boiling nitrocellulose cooling, etc.

i. Food industry: sterilization and cooling of fruit juice, heating and cooling of animal and vegetable oil, etc.

j. Grease Technology: dry soap base at atmospheric pressure, heat or cool various process fluids.

k. Central heating: waste heat area heating in thermal power plant, heating bath water.

l. Others: oil, medicine, ships, desalination, geothermal utilization, solar energy utilization.