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Introduce several classification of heat transfer equipment
Dec 26, 2016

Heat refers to heat from the heat flow delivered to the cold equipment, heat exchangers are widely used in oil refining, chemical industry, light industry, pharmaceuticals, machinery, food processing, power, atomic energy industry sector. Typically, in some chemical plant and equipment investment in the heat exchanger 30% per cent of total investment; in modern refinery, accounted for all of the heat exchanger equipment investment 40%; in sea water desalination industrial production, almost all of the equipment is made up of heat exchanger. Advancement of heat exchangers, rationality and reliability of operation directly affect the quality, quantity and cost of the product.

Depending on the intended use, heat exchangers can be divided into four categories: heaters, coolers, evaporators, condensers. According to the heat transfer principle and realization of heat exchange can be divided into partitions in the form of heat exchangers, mixed-type heat exchanger, regenerative heat exchangers (hot and cold fluids in direct contact), indirect heat exchangers of liquid heat four. A heat exchanger is measured high heat transfer efficiency, smaller fluid resistance, strength, structure reasonable, safe and reliable, saving material, low cost, manufacturing, installation, maintenance convenience. In petroleum, chemical production of middle-wall heat exchanger applications most widely used.

Different modes of heat exchange equipment in accordance with traditional, heat transfer equipment can be divided into three categories:

1. heat exchanger

Using hot and cold fluid directly to exchange heat with the mixing effect of this type of exchanger structure is simple, but cheap, often Tower. Mix the two allowed full and medium at different temperatures, and completed its process of direct contact heat transfer. For example: water tower (cooling tower), air dryer, granulating Tower, such as fluidized bed.

2. the regenerative heat exchanger

In this kind of heat exchangers, energy transfer through the lattice bricks or packing heat to finish. Let fluid pass, savings on heat regenerator and then make cold flow through, put the heat away. Because of two alternating the transformation input, so inevitably there are a few of the fluid mixing with each other, resulting in fluid "pollution".

Regenerative heat exchanger compact, cheap, large heat transfer area per unit volume, is more suitable for gas-gas heat exchanger occasions. Mainly used in the transformation of the raw gas in petrochemical production and waste heat from the air. Structural characteristics of Rotary regenerative heat exchangers is continuous operation, heat forming is generally used in the heat exchanger plate or wire mesh Assembly sector within the Cabinet, the outer metal shell sealing, and every 1~4 is moving, slowly rotating continuous heat.

3, recuperative heat exchanger

So-called recuperative heat exchanger refers to two different temperatures of the fluid at a fixed wall (known as heat transfer surfaces) separated by spaces flow through the wall heat conduction and convection heat transfer on the surface of the wall. Heat transfer fluid does not participate in mixed continuous and stable transfer process. Recuperative heat exchanger the heat transfer surface used mostly good thermal conductivity of metal. On some occasions due to preservation needs, it also uses non-metallic (such as graphite, Poly Vinyl) made. This is the most widely used class of industrial heat exchangers. Hot and cold fluids separated by a solid wall heat transfer through the wall surface.