1. Enhanced heat transfer components and high-efficiency heat exchanger Research

         1.1 Cross Cemetery Rod Baffle tube heat exchanger

         This is a combination of Rod Baffle Heat Exchanger Tube band technology and an efficient technology enhanced heat exchangers. Rod Baffle Heat Exchanger is the Philips 70s last century to address the natural gas heat exchanger flow-induced vibration problem leveraged the development of a baffled heat exchanger grid. Characterized by strong anti-vibration, the elimination of the shell-side flow stagnation, improving the shell-side fluid velocity and temperature distribution. Chemical Machinery Factory in Guilin in South China University of Science and Technology with Professor Qian Songwen successful cooperation and enhanced heat transfer tubes for trace element spiral rod baffle heat exchanger, heat exchanger area to save nearly 60%, the effect is very remarkable. At present, the spiral rod-sik Rod Baffle Heat Exchanger in Guilin production plant has been systematic. In recent years, Guilin Chemical Machinery Plant, South China University of Technology Institute of Chemical Engineering and the State Education Commission to develop energy-efficient heat transfer and cooperation between research laboratories, will be in the same tube under the flow of heat transfer efficiency is better than spiral tube tubes for the band-for-Rod Baffle .1995 Reheater May in the design and manufacture of cross striations DN1400 Rod Baffle tube heat exchanger in a medium-sized fertilizer plants in Yunnan transform industrial operation system for people to replace the original use of the DN2400 Tubular Heat Exchanger Baffle板主, 540mZ heat transfer area to replace the original equipment 1627m, the heat transfer area, equipment to reduce the weight of the original 37.61d to 17.27d, investment in equipment to save 1 / 3. the application of enhanced heat transfer components and equipment to develop high-efficiency heat exchanger : greatly increase the number of enterprises in economic and social benefits. striated Rod Baffle tube heat exchanger the development and application of the results proved that the enhanced heat transfer components and Rod Baffle organic combinations. in improving the rate of heat transfer tube at the same time also increased the shell-side heat transfer rate. striated industrial operation proved highly efficient heat transfer tube, fluid resistance small, anti-vibration characteristics of a good performance.

         TUBE 1.2 holes the whole round draw Shan Baffle Plate Heat Exchanger

         China's existing medium-sized nitrogen fertilizer plant hydrogen compressor coolers, heat has long been inefficient and ineffective way cooler flow, fluid erosion caused by horizontal vibration of heat exchanger has been the unresolved technical issues directly affect the compression of nitrogen the efficiency of the machine. zoom round the whole tube gate slots baffled heat exchanger plant in the past two years, other schools to develop a new type of heat exchanger, heat transfer enhancement is also a new type of components and the structure of shell-Baffle portfolio optimization. is generally believed that enhanced convection heat transfer method is repeated to change the vertical pressure gradient under the flow of fluid, which in turn flow from the turn of the expansion and contraction of the segment to achieve. big child studies have proved that the same wave-type channel under flow resistance than the parallel flow channel has a higher heat transfer performance. zoom paragraph of its expansion of the effective use of contraction above the fluid used to improve adhesion of the effect of velocity; whole round hole Liuhong Baffle grid that is folded Shan flow circular plate as a whole can not pass bow-shaped mouth and wash the tube for each tube row bridge, the parameters can be mesh hole size required to determine the flow rate. newly developed high-efficiency heat exchanger to replace the nitrogen fertilizer plant in China's medium-sized Chinese-made hydrogen-nitrogen compressor one, two, three paragraphs back to the original cooler baffle ring. zoom round the whole tube gate slots baffled heat exchanger operation of the operation of industrial applications with significant results showed that the effect of enhanced heat transfer.

         1.3 spider spinning flat tube heat exchanger

         Spiral flat tube (TwistedTabe) was introduced in Sweden in recent years AUares a high-efficiency heat exchanger components, the structure of spiral flat tube heat exchanger tube is characterized by any of the above cross-section of a long back, when assembled into a heat exchanger can be mixed control (ie, spiral flat tube with a mix of smooth tube), it could be a pure flat tube spiral. spiral flat tube manufacturing process by the "partial pressure", "hot-twisting," the two forming process is complete, the tube is similar to an oval cross-section tubes, The purpose of the length of the ellipsoid axis ratio in accordance with the agenda and shell heat exchanger at a flow rate of the design process to determine, when the flow tube when the lower basin. can increase the length, the ratio of short to reduce the flow cross-section to enhance the flow, so that both sides in the heat exchanger better the flow of state. From the tube, structural analysis of end-of-pipe can be considered flat spiral tube heat transfer enhancement is mainly spiral flat tube can the unique structure of the tube and shell side in a spiral at the same time to run, to the degree of turbulence. Spiral flat tube assembly than the conventional heat exchanger heat exchanger overall heat transfer coefficient to 40%, while almost the same pressure drop, which is to increase the pump power consumption to increase heat transfer efficiency with different results. spiral flat tube heat exchanger can be monoxide for the gas, liquid-liquid, liquid heat transfer process monoxide. in the chemical, petrochemical industry has broad application prospects.

         1.4 ring hollow shell and tube heat exchanger

         Ring hollow shell and tube heat exchanger is the South China University of Technology Institute of Chemical Engineering and the State Education Commission of heat transfer and energy research and development laboratory and others Deng first invented a new type of shell and tube heat exchanger. Has been the national invention patent . Hollow shell and tube heat exchanger of the development of the main settlement of the domestic sulfate, petrochemical and other industries monoxide gas heat transfer process. Shell and tube heat exchanger heat transfer performance of poor children of steel consumption, and fluid resistance of high-power system major technical problems. used to optimize the overall structure of the hollow ring shell and tube heat exchanger to replace the partition baffle heat exchanger, can heat steel to reduce the 35-for-write ~ 50%, gas pressure drop by 30% ~ 40%. Hollow shell and tube heat exchanger in order to strengthen as a heat exchanger tube, can also strengthen the inter-tube and tube structures, porosity, and formation of fluid resistance small, the shell-side fluid pipe隙间role in the vast majority of pressure drop can be enhanced rough tube wall heat transfer surface to promote heat transfer fluid flow stagnation layer turbulence intensity, lower heat and mass resistance to the purpose of enhancement of heat transfer. Experimental results also show that when the same support to strengthen control (ie control band), the supporting structure of the hollow ring than in the U.S. oil company Phillips'70s Rod Baffle developed a supporting structure can get a good rough control heat transfer enhancement effect, in the same shell-side conditions, high heat transfer coefficient of about 35%.

         In summary, enhanced heat transfer research and development component is bound to bring a variety of shell structures Baffle progress, strengthen the flow of heat transfer components of the change in status, between the baffle tube to study the form of the structure corresponding in order to achieve the inter-tube pipe and the overall effect of enhanced heat transfer. Industrial application results show that a wide range of enhanced heat transfer component is a basis of research results, the new structure of shell-side baffles (such as Rod Baffle, the whole garden gate slots Baffle plate, hollow ring folding nets, etc.) to enable the development of shell and tube heat exchanger of the folded structure of the ever-changing flow. At present, under different operating conditions, the use of different operating conditions, into a variety of new and highly efficient heat exchanger.

         2. Plate heat exchangers in refrigeration technology and development

         Plate heat exchanger is a highly efficient and compact heat transfer equipment. The 19th century, it is first of all the 80's as a device for the successful development of low-temperature sterilization, and to 20 during the last century began to be used on the food industry. As a result of plate heat exchanger in the manufacture and use have some unique characteristics. Therefore, the current plate heat exchanger has been widely used in petroleum, chemical, light industry, electric power, metallurgy, machinery, energy and other industrial areas, as a heat exchanger in the family a very competitive species. Technology in refrigeration, heat exchanger is indispensable for refrigeration equipment, condenser, evaporator, regenerator and the intercooler heat exchanger, such as equipment, not only in weight, volume and metal consumption of the whole of the cooling device 50 written above, but also for cooling will have a significant impact on performance. Therefore, the enhanced heat transfer of refrigerant heat exchanger to reduce the weight and size, reducing the metal consumption has been the development of refrigeration technology in the direction has been the emergence of a new, all-welded plate heat exchanger in the refrigeration technology applications, and demonstrate strong potential for development.

         Refrigeration of Shell-and-tube heat exchanger as compared with a plate heat exchanger in addition to the general characteristics of plate heat exchanger with cooling also has the following characteristics.

         2.1 Filling refrigerant reduced in favor of Central slope protection and lower operating costs

         Shell and tube heat exchanger shell side and tube side are a lot of volume, for the normal work of the refrigeration system must be大盆filling refrigerant, but also may cause environmental pollution. The plate heat exchanger on the one hand, small size and spacing on the other hand, small size, thermal load per 1kw only 6 bow g refrigerant, filling only their shell and tube heat exchanger 1 / 7 or so.

         2.2 less tendency to freeze, antifreeze high-performance

         As a result of low water flow rate, the plate heat exchanger will be able to form a high degree of turbulence, a very uniform temperature distribution, thereby reducing the tendency to freeze the chilled water. Even in freezing, frozen and better able to bear the pressure, rather than shell and tube heat exchanger heat pipe as easily胀裂, and can continue to use after frozen.

         2.3 Yan made a thorough, high economic

         Refrigerant in the refrigerant in the evaporator plate heat exchanger, it is easy to achieve complete evaporation to achieve the degree of non-liquid, so in most cases, do not need refrigeration system of gas-liquid separator settings. And easily achieve the unit, and installation is simple and convenient, maintenance and transportation can be cost-saving and reduce costs. As a result of the traditional shell and tube heat exchanger as compared to cooling plate heat exchanger used with very clear advantages. Since the beginning of the last century in the 70s has been the application of refrigeration equipment has been increasing attention, especially in many developed countries, such as Europe, the United States, Japan, Australia attaches great importance to all refrigeration plate heat exchanger with the research and application. Japan in the last century began to study the early 80s with cooling plate heat exchanger, and the use of refrigeration equipment, has received good value for money. Some of the world's well-known companies such as York Refrigeration, Carrier,川恩, Hitachi, Maekawa also have devices in the refrigeration plate heat exchanger used. This type brazing plate heat exchanger for the use of welding纯钢agent, the main Freon used in refrigeration systems, can not have a corrosive effect on copper ammonia cooling system. The 20th century into the 90's, the cooling plate heat exchanger and used to further the development of an ammonia refrigeration system can be used in the plate heat exchanger developed in Sweden stilbaai success. This new plate heat exchanger of the combined (WPHE) a combination of plate and frame type (PHE) and brazing-type (CBE) of the characteristics of welding used in the ammonia-side sealed refrigerant side in the gasket seal is still used. And freon refrigeration systems, plate heat exchanger used ammonia refrigeration system units, not only in materials, the size of the weight there is an obvious advantage, but also a high coefficient of performance 10% ~ 20%. At present, this system has been formed the eight products, cooling capacity from 10kw ~ 1000kw. Ammonia Plate Heat Exchanger with the development of successful, not only widened the plate heat exchanger in refrigeration technology in the scope of application, but also for the protection of the ozone layer, will have important significance for the protection of the environment, but also will promote the further development of refrigeration technology. Since the last century, the beginning of the 60's production of plate heat exchangers. By 1994, energy-saving products to the fixed plate heat exchanger manufacturers reached 15, and also carried out a number of manufacturers of plate heat transfer characteristics of the evaporator and the research work. However, these manufacturers are also limited to the production of plate and frame heat exchanger (DHE). In China, the cooling plate heat exchanger with the application is still in its infancy, many refrigeration manufacturers, such as air-conditioning plant in Shanghai, Tianjin Carrier, Beijing Peoples, such as Shanghai Sinko. Are in their own products used for cooling plate Reheater. Such as air-conditioning plant in Shanghai in 1994 to develop the air-water heat pump unit using the company's SWZP plate heat exchanger using refrigeration. A put into operation by the user's favor, the plant to the product as a leader, the output value in 1995 reached 270 million million. It can be expected, with the cooling plate heat exchanger with the understanding and awareness of its high efficiency plate heat exchanger heat transfer, the structure of compact, energy-saving materials and features such as environmentally friendly features will become increasingly widely used in refrigeration devices.

         Plate heat exchanger is a compact and efficient heat transfer equipment, it involves the application of almost all industrial fields and their types, structure and use are still evolving. In recent years, the welding-type plate heat exchanger of the compact, light weight, good cooling performance, low operating cost advantage has become increasingly been recognized. As China's economic development, the development of refrigeration technology promising, particularly in large industrial refrigeration equipment and air-conditioning with the rapid development of refrigeration devices, which use a variety of refrigeration application of plate heat exchanger to provide a broad market. At present, China has a better frame of research, production base, it is recommended as soon as possible cooling plate heat exchanger with the research and development. On the one hand, expanding plate heat exchanger can be application of the scope and scale of production, on the other hand, can improve the performance of refrigeration equipment, heat transfer equipment to save investment and promote the development of refrigeration technology.