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5 new type of high efficiency heat exchanger detailed introduction, increase knowledge!
The heat exchanger manufacturer will give you a detailed introduction of the 5 types of heat exchangers.
In recent years, domestic energy saving, efficiency and other aspects of improving the performances of heat exchanger in improving the heat transfer efficiency and reduce the heat transfer area, reduce the pressure drop, improve device thermal strength etc. has achieved remarkable results, and with the large-scale industrial equipment and high efficiency of heat exchanger also tends to be large, and to the temperature difference the design and development of low pressure loss design.
1. Pneumatic spray fin tube heat exchanger
In Russia, an advanced method, namely pneumatic spraying, is proposed to improve the performance of the finned surface. The essence is to spray powder particles on the surface of the fin by high speed cold or slightly warmer particles containing particles. This method can be used not only to spray metal but also to metal ceramic mixture, so as to obtain a variety of different properties of the surface.
In practice, the contact resistance of the bottom surface of the fin is one of the factors that restrict the fins of the tube. In order to evaluate the element of the fin tube heat exchanger, the experimental study was carried out. The experiment is to spray AC - aluminum on the surface of the fin and add the 24A white furnace alumina. The contact resistance of the bottom surface of the fin can be evaluated by sorting out the experimental data.
The efficiency of the fins studied is compared with the calculated data, and the conclusion is that the contact resistance of the bottom surface of the aerodynamic spray fin has no substantial effect on the efficiency.
In order to verify this point, the structural analysis of the transition zone between the tube and the fin is also carried out. The analysis of the specimen in the transition zone shows that the whole length of the connecting boundary is no tight micro crack.
Therefore, the aerodynamic spraying method promotes the formation of the branching boundary between the surface and the basic interaction, and promotes the penetration of powder particles into the matrix, which indicates the high adhesion strength, physical contact and metal chain formation.
2. Welding type plate heat exchanger
Replacing the rubber gasket with welded structure, the appearance of fully welded and semi welded plate heat exchangers eliminates the limitation of temperature resistance, corrosion resistance and pressure resistance of gasket materials. The use of plate heat exchangers for corrosive medium has been greatly developed in recent years. A hybrid welded plate heat exchanger in Germany and Japan cooperation, operating pressure
From vacuum to 6, the operating temperature is 200 to 900 C, and the heat transfer area of the single unit F is 3M2 to 2 000m2. It can be used for gas - gas, gas - liquid, liquid - liquid heat transfer and vapor condensation.
The American VICARB company developed the COMPBLOC welded plate heat exchanger in 1989. It is a compact, efficient and patented heat exchanger.
3. Spiral baffle heat exchanger
The spiral baffle plate heat exchanger is the latest development of a shell and tube heat exchanger, which was proposed by the ABB company. In the tube heat exchanger, the shell path is usually a weak link. ABB, the United States, has proposed a new approach to spiral baffles.
The basic principle is that the special section of the circular section is installed in the "quasi helical baffle system". Each baffle occupies the 1/ 4 of the cross section in the shell side of the heat exchanger, and its inclination angle faces the axis of the heat exchanger, that is to maintain a certain inclination with the axis of the heat exchanger. The adjacent baffles are connected to the periphery of the baffle plate and spiral in a continuous spiral.
Each baffle is at a certain angle with the flow direction of the shell side fluid, making the shell side fluid spiral movement, which can reduce the dead angle between the tube plate and the shell, thereby improving the heat transfer efficiency. Because the medium spiral flow, resulting in the radial velocity gradient, forming radial turbulence, completely changed the baffle heat exchanger fluid flow and flow field distribution, thinning of the tube surface thickness of viscous layer, improve the heat transfer coefficient of heat transfer, eliminate dead bow plate, the heat transfer condition of shell the process is greatly improved. In addition, the helical baffle structure can meet the wide technological conditions, and has great flexibility in design. It can choose the best helix angle for various special process conditions.
4. new type of twist tube heat exchanger
A flat tube heat exchanger, usually called a floral tube heat exchanger, has been developed by Alares, Sweden. The manufacturing process of the spiral flat tube includes two processes: "flattening" and "hot twisting". The improved twisted tube heat exchanger is as simple as the traditional shell and tube heat exchanger, but it improves heat transfer, reduces scaling and real countercurrent, reduces cost, no vibration, saves space, and has no baffle element. Because of the unique structure of the tube, the tube path and the shell side are at the same time in spiral motion, which promotes the degree of turbulence. The total heat transfer coefficient of the heat exchanger is 40% higher than that of the conventional heat exchanger, and the pressure drop is almost equal. The combination of the spiral tube and the light tube can also be used when the heat exchanger is assembled. The heat exchanger is in strict accordance with the ASME standard, general use of shell and tube heat exchanger and conventional devices are available in the heat exchanger to replace, it can obtain optimum values for ordinary shell and tube type heat exchanger and heat transfer equipment and the estimation has wide application prospect in chemical industry, petroleum and chemical industry.
5. Hitan winding wreath heat exchanger
This type of heat exchanger is a kind of new product development Cal Gavin British Ltd company, using a Hitan called mat rix element s filamentous flower inserts, can make the fluid to generate three-dimensional complex flow and radial displacement of the spiral flow superimposed at low speed, can improve and enhance the turbulence induced by the fluid along the gradient the direction of temperature disturbance, can greatly improve the heat transfer coefficient under the condition of no increase in resistance.