The foreign market survey showed that the heat exchanger, shell and tube heat exchanger (64%). Although a variety of plate heat exchanger's competitiveness on the rise, but the shell and tube heat exchanger will remain dominant. With the power, petrochemical industry, the equipment also continues toward high temperature, high pressure, large-scale direction. The heat exchanger in the structure, there are many new development, known as 'steam Prince' said the SECESPOL heat exchanger is one of the typical. Now several new types of heat exchangers on the characteristics outlined below:

A screw threaded tube heat exchanger
SECESPOL International Group is an international group of companies, professional manufacturer of heat exchangers in Europe, with more than 20 countries worldwide network of sales and service organization. 1988 invented the world's first spiral thread JAD tube heat exchanger, steam heat exchanger in the field because of its unparalleled advantage, heat transfer coefficient up to 14000w / ㎡. ℃, the highest temperature 400 ℃, in Europe as the "Prince of steam." SECESPOL International Group will adhere to the use of the most advanced heat transfer technology, develop and produce the best performance of the heat exchanger to provide the highest quality engineering services, to meet customer needs.

Second, the pneumatic spray finned tube heat exchanger
Russia has proposed an advanced method that pneumatic spray, to improve the performance of the surface of the fin. Its essence is the use of high-speed cold or slightly heated fluid containing particles to the fin surface of the plating powder particles. Using this method can not only spray coating of metal alloys and ceramic (cermet mixture), resulting in a variety of different properties of the surface.
In practice, usually the underside of the fin tube contact resistance is to limit the installation of one of the factors fins. To assess the finned tube heat exchanger components were studied. Test is used in AC-fin aluminum surface coating, and add the white furnace 24A alumina. To test the data collated, able to assess the underside of the fin contact resistance.
Will study the efficiency of the fin compared with the calculated data, concluded that: pneumatic spray the underside of the fin contact resistance without substantial impact on efficiency. To confirm this, but also on the base (tube) and surface (fins) of the transition zone of the metallurgical structure analysis.
Transition zone of the specimen analysis showed that connect the entire length of the border all the rigor of the micro-cracks. Therefore, the pneumatic spray to promote interaction between the surface of the basic branches of the border with the formation of powder particles can promote the penetration of the substrate, which shows the adhesion strength is high, there is physical contact and metal-forming.
Thus not only can be used for pneumatic spray forming, can also be used will be common method of manufacturing the heat exchanger fin tube fixed on the surface, but also can be used to supplement ordinary reinforced bottom fins. It can be expected in a compact and efficient pneumatic spraying the production of heat exchangers, will be widely used.
Third, the helical baffle heat exchanger
In shell and tube heat exchanger, the shell is usually a weak link. Often baffles the ordinary bow can cause tortuous flow channel system (Z-shaped flow channel), this will lead to larger dead and a relatively high back-mixing. These corners can result in increased shell fouling of heat transfer efficiency disadvantage. Back-mixing can also reduce the distortion and the average temperature difference. As a consequence, compared with the piston flow, arched baffle will reduce the net heat transfer. Superior arcuate baffle shell and tube heat exchanger is difficult to meet the requirements of high thermal efficiency, Guchang for other types of heat exchangers replaced (such as compact plate heat exchanger).
For ordinary baffle geometry improvements, is the first step in the development of the shell. Although the introduction of bias, such as seals and additional turning flow plate and take other measures to improve heat exchanger performance, but the general design of the baffle major drawback remains.
To this end, the United States proposed a new plan, which proposes the use of helical baffles. This design has the advanced nature of fluid dynamics and heat transfer test results confirmed that this design has been patented. Such a structure to overcome the common shortcomings of the main baffle.
Helical baffle design principle is simple: the circular cross-section of the special board installed in the "spiral baffle system to be" in each baffle shell heat exchanger in the total cross-section of a quarter, and its inclination towards heat exchanger of the axes, the axis of the heat exchanger that is in keeping with the inclination. Adjacent baffle surrounding phase, and into a continuous spiral cylindrical Department. Baffle axial overlap, For narrow the span of the tube support, but also available double helix design.
Helical baffle structure to meet the relative width of the process conditions. This design has great flexibility for different operating conditions, select the best helix angle; to choose respectively overlap the double helix baffle or baffle structure.
Fourth, the new twist tube heat exchanger
Swedish Alares has developed a flat tube heat exchanger, often referred to as twist tube heat exchanger. Houston Brown's made improvements. Spiral flat tube manufacturing process includes a "flattening" and "hot-twisting" two processes. Improved twist tube heat exchanger with the traditional shell and tube heat exchanger as simple, but there are many exciting advances, it received the following technical and economic benefits: improved heat transfer, reducing the scale, the true counter-current, reduced costs, no vibration, saving space, no baffle element.
As the tube structure unique to both tube and shell in the spiral movement, promoting the turbulence level. The heat exchanger overall heat transfer coefficient higher than 40% of conventional heat exchangers, and pressure drop is almost equal. Can be used when assembling the heat exchanger tubes and flat spiral fluorescent tubes mixed mode.
The heat exchanger in strict accordance with ASME standards. Any use of shell and tube heat exchanger and conventional devices are available at such a heat exchanger replaced. It can be an ordinary shell and tube heat exchangers and plate and frame heat transfer equipment to obtain the best value. Estimated in the chemical, petrochemical industry and has broad application prospects.
Fifth, non-brazing wire tendons around the spiral heat exchanger tube
Wire wound around the tube as the ribs (fins) of the spiral heat exchanger (TA), are generally used welding methods of metal wire fixed on the pipe. But this method the quality of the entire device has a series of impact, because the heat from the brazing method is bound to the "net" a large part of the surface of the tube and wire. More importantly, due to rapid aging and broken solder will cause clogging of machinery and equipment, along with earlier reported loss.
Russia recommended a new method of manufacturing tube around the wire reinforcement, that is winding through the pipe and wire tension generated when mechanical contact to fix ribs. This method can be used to promote the continuous nature of the brazing time (ie wire securely fixed to the tube, while not over-compress the tube cross-section), so just do the cut off for the wire, the solder can be considered more more popular approach. However, if the use of wire as the ribs (fins) to increase the heat transfer area, only when a non-brazed ribs is not less than the effective heat transfer surface when soldering connection, it should be more emphasis on this approach.
Tests showed that when the metal wire in contact with the tube is linear, the maximum effective heat transfer surface, but this time the tube sliding along the wire. So the key is to select the best contact width, that is, when the tube around the wire width of the deformation traces. Thus, the effective non-brazing brazing heat transfer surface than when large.