【正文】 s, in order to adapt to the high temperature and high pressure conditions of heat transfer and energy conservation needs, typical of the shell and tube type heat exchanger has been further development. In 70 time metaphase, in order to enhance heat transfer, in research and development of heat pipe on the basis of creating a heat pipe type heat exchanger. Heat exchanger according to the mode of heat transfer can be divided into different hybrid, regenerative and wall type three class. Mixed type heat exchanger is through the cold, hot fluid, mixed direct contact heat exchange heat exchanger, also called contact type heat exchanger. Due to the two fluid mixing heat exchange must be timely separated, this kind of heat exchanger is suitable for gas, the liquid between the two fluid heat exchanger. For example, chemical plant and power plant in cold water tower, water from top to bottom spray, and the cold air from the。 in oxidative and acidic medium has good corrosion resistance. The structure solves successfully the thermal pensation and can solve the problem of gas sealing. The device has high heat transfer efficiency, obvious energy saving effect, is used to preheat the bustion air or heating some process gas, can save energy, fuel saving rate up to 30 %55%, and strengthen the process, significantly improving production capacity of. Ceramic heat exchanger production technology and kiln production process is basically the same, thermal conductivity and oxidation resistance is the main application properties of materials. It is the principle of the ceramic heat exchanger placed in the flue outlet is near, high temperature areas, without the need for mixing cold and heat protection, when the furnace temperature 12501450 C, a flue outlet temperature shall be 10001300 C, ceramic heat exchanger heat recovery can reach 450750 C, to be recycled into the hot air in the kiln with gas formation of mixed gas bustion, so to reduce production costs, increase economic benefits. Ceramic heat exchanger in metal heat exchangers using constraints to get very good development, because it is better to solve the corrosion resistance, high temperature resistance and other topics. Its main advantages are: good thermal conductivity, high temperature strength, good thermal shock resistance, oxidation resistance. Long service life, small amount of repair, stable and reliable performance, simple operation. Development history Plate heat exchanger plate heat exchanger in twentieth Century 20 time appear, and the application in food industry. Escrow to board made of heat exchanger, and has the advantages of pact structure, good heat transfer effect, thus gradually developed into a variety of forms. At the beginning of 30 time, the first Swedish made of spiral plate heat exchanger. Then the brazing method creates a posed of copper and its alloy material of plate fin heat exchanger, used in aircraft engine cooling. At the end of the 3039。s version of the GMP launch, 316L stainless steel as the main heat exchanger, will bee the beverage, food, and the pharmaceutical industry to choose. Double tube plate heat exchanger is also known as P type heat exchanger, in shell and tube heat exchanger at each plus a tube plate, can effectively prevent the pollution caused by leakage. Homebred now brand less, expensive, general in 100000 yuan of above, can be imported to hundreds of thousands of. Compatible with the new version of GMP, although expensive, but the market is broad. Mixed type heat exchanger of mixing heat exchanger is to rely on the cold, hot fluid direct contact heat, the heat transfer mode avoids the heat transfer wall sides and fouling resistance, as long as the fluid contact between the case is good, there is a large heat transfer rate. Therefore he that allows fluid mixed with each other occasions, can adopt the hybrid heat exchanger, such as gas washing and cooling, the cooling circulating water, steam water mixing between the heating, steam condensation etc. It is applied widely in chemical and metallurgical industry, power engineering, air conditioning engineering and many other production branch. According to different purposes, the mixed type heat exchanger is divided into the following several different types: ( 1) cooling tower ( or cold water tower ) In such a device with natural ventilation, or mechanical ventilation methods, production already raises the temperature of the water cooling after recycling use, in order to raise systematic economic benefits. For example, thermal power plant and nuclear power plant circulating water in ammonia production, such as cooling water, cooling tower cooling by water after the recycling use, this method in the actual project has been widely used. ( 2) the gas washing tower ( or tower ) In industry to use this device to washing gas have a variety of purposes, such as using liquid absorption gas mixture of some ponents, in addition to the gas in the dust, gas, wet or dry. But its most extensive use is a cooling gas, and the