As the carrier equipment of fluid heat exchange,
Spiral Plate Heat Exchanger has been widely used in heat exchange in petroleum, chemical industry, food, medicine and other industries. In the food industry, spiral plate heat exchangers are most notably used in fried food applications. The production process of fried food needs to be safe, reliable, energy-saving and hygienic, and the
Spiral plate heat exchanger has undoubtedly become the first choice for the heat exchange process.
Structural features of spiral
Plate Heat Exchanger:
The spiral plate heat exchanger is formed by connecting two metal coils and coiling them into a concentric spiral channel. In the heat exchanger, the fluid can realize full countercurrent flow. Taking the Zhongfan detachable spiral plate heat exchanger as an example, the two ends of the two spiral channels are staggered and welded, and the flat cover is fixed and sealed with gasket bolt flanges. In the application of the food industry, most of them will choose the non-detachable spiral plate heat exchanger, that is to say, all the two ends of the channel are filled with round steel or embankment bars, and they are directly welded to seal, thus eliminating the need for flanges, flat cover plates and other components. , saving costs, this non-detachable spiral plate heat exchanger is type I in the national standard selection.
Because the structure of the product is double helix, under the condition of correct installation and use, the fluid will reach turbulent flow at a low Reynolds coefficient, so the heat transfer coefficient is much higher than that of the fluid in the straight tube, achieving high-efficiency heat exchange. In the previous research on the heat transfer coefficient, that is, K, the unit W/(㎡*℃), the Shanghai research department has done a comparative test, and the K value of the spiral plate heat exchanger is 40 times greater than that of the
Shell And Tube Heat Exchanger. -70%; In the statistics of food production and instant noodle production line of Guangzhou People's Machinery Factory many years ago, a 60-square-meter spiral plate heat exchanger was also used, and the efficiency reached the practical effect of the original 100-square-meter spiral plate heat exchanger. Improved steam utilization and reduced energy costs.
In addition, since palm oil is often used in the food industry, the spiral plate runs through a uniform single channel with a high flow rate and a vortex state, so dirt is not easy to accumulate. Narrow, since the flow rate of the fluid itself remains unchanged, the flow rate will increase, thereby scouring the dirt and realizing the self-cleaning effect. According to the feedback information from the food factory, as long as the equipment is regularly maintained and cleaned with solvent cleaning fluid during the maintenance period, the spiral plate will not be blocked and the service life will exceed ten years.
Due to the high-efficiency heat exchange of spiral plate heat exchangers, it was introduced to the United States in the 1930s, and it began to be popularized in Japan after World War II. The current research and manufacture of spiral plate heat exchangers in the world is at the highest level in Western Europe and Northern Europe. Some companies represented by Alfa Laval. my country began to develop its own spiral plate heat exchanger in 1966, and after decades of continuous efforts to improve it, it gradually occupied a large part of the market share.
February 20, 2023
