The heat exchanger is a heat exchange equipment that transfers the heat of the hot fluid to the cold fluid to make the fluid temperature reach the specified indicators of the process flow. There are many types of heat exchangers. However, according to the principle and mode of heat exchange of the cold and hot fluid, it can be basically divided into three categories: inter wall type, mixed type, and heat storage type. Among the three types of heat exchangers, the wall type heat exchanger is the most widely used. Heat exchanger is a general equipment in chemical, petroleum, power, food, and many other industrial sectors, and plays an important role in production. In chemical production, heat exchangers can be used as heaters, coolers, condensers, evaporators and reboilers, and are more widely used. Heat exchanger is a kind of unit equipment, such as heater, cooler, condenser, etc. It is also a component of a process equipment, such as the heat exchanger in the ammonia converter. Therefore, heat exchanger is an important unit equipment in chemical production.

At present, remarkable achievements have been made in domestic research on improving the performance of heat exchanger, improving heat transfer efficiency, reducing heat transfer area, reducing pressure drop, and improving the heat intensity of the device in terms of energy conservation and efficiency enhancement. The extensive use of heat exchanger effectively improves the utilization rate of energy, reduces the cost of enterprises, and improves the efficiency.

Plate heat exchanger is a new and efficient heat exchanger with corrugated heat transfer surface. It has the following characteristics:

a. High efficiency and energy saving: plate heat exchanger has high heat transfer coefficient, which is 30%~50% higher than the same square tube heat exchanger

b. Compact structure: plate heat exchanger has small volume, small floor area, small heat exchange loss, light weight. About 250 square meters of heat transfer area is arranged in each cubic meter, and the floor area is only 1/4-1/8 of the tubular heat exchanger.

c. Convenient disassembly and cleaning: plate heat exchanger clamps the clamping plates and plates by clamping bolts, so it is convenient to disassemble and open for cleaning at any time. Sometimes, it is not even necessary to completely disassemble the plate and simply loosen the compression bolt to take out the plate for cleaning and replace the gasket, so that the plate can be replaced. At the same time, due to the smooth surface and high turbulence, it is not easy to scale.

d. Long service life: the plates of plate heat exchanger are made of stainless steel or alloy plates, which can resist various corrosive media.

e. Strong applicability: the plate of plate heat exchanger is an independent element, and the flow can be increased or decreased at will according to the requirements. The forms are diverse and suitable requirements for various processes.

f. No cross flow: the leakage liquid channel of the sealing groove of the plate heat exchanger will not cross flow among various media. Even if there is leakage, the media will always be discharged outwards.