The Role of Heat Exchanger

Heat exchanger, also known as heat exchanger, is a device that transfers part of the heat of hot fluid to cold fluid. Heat exchanger plays an important role in many industrial productions such as chemical, petroleum, electricity, food, etc. Heat exchanger can be used as heater, cooler, condenser, evaporator and reboiler, etc. , widely used in chemical production.

Heat exchanger refers to two fluids of different temperatures flowing in a space separated by a wall, and heat exchange occurs between the two fluids through heat conduction of the wall and convection of the fluid on the wall. Baffle heat exchanger has shell and tube type, sleeve and other types of heat exchangers. Heat exchanger is a widely used heat exchanger. Regenerative heat exchanger Regenerative heat exchanger heat is transferred from high temperature fluid to low temperature fluid by a heat accumulator composed of solid matter. After the hot medium reaches a certain temperature by heating the solid matter, the cold medium is heated by the solid matter to achieve the purpose of heat transfer. Regenerative heat exchanger rotary type, valve switching type, etc. Fluid-connected indirect heat exchanger Fluid-connected indirect heat exchanger, connecting two surface-type heat exchangers, in which the heat carrier circulates the heat exchanger, the heat carrier circulates between the high-temperature fluid heat exchanger and the low-temperature fluid, and receives heat in the high-temperature fluid, and in the low-temperature fluid/kloc-0. Direct contact heat exchanger is also called mixed heat exchanger. This type of heat exchanger is a device in which two fluids are directly in contact and mixed with each other for heat exchange, such as cooling towers, gas condensers, etc. Duplex heat exchanger is a device with two heat exchange modes, namely indirect heat exchange between steam and water surfaces and direct mixed flow heat exchange between water and water. Compared with indirect heat exchange between steam and water surfaces, it has higher heat exchange efficiency. Compared with direct mixed heat transfer between steam and water, it has higher stability and lower unit noise.

Spray type heat exchanger: This type of heat exchanger is a heat exchanger that fixes the heat exchange tubes in rows on a steel frame, the hot fluid flows in the tubes, and the cooling water drips evenly from the upper spray device, so it is also called a spray cooler. In the spray type heat exchanger, there is a layer of liquid film with high turbulence outside the tube, and the heat transfer coefficient outside the tube is much greater than that of the immersion type. In addition, this type of heat exchanger is mostly placed in a place where air circulates. Heat exchanger sleeve type heat exchanger is a concentric sleeve made of straight tubes of different diameters, connected by U-shaped elbows. In this type of heat exchanger, one fluid enters the inside of the pipe and the other fluid passes through the annular gap. Both can obtain a higher flow rate, so the heat transfer coefficient is larger. In addition, in the sleeve/kloc-0, the sleeve heat exchanger has a simple structure, can withstand high pressure, and is easy to use (the number of pipe sections can be increased or decreased as needed). In particular, the sleeve heat exchanger has the advantages of a large heat transfer coefficient, a large heat transfer driving force, and a strong ability to withstand high pressure.