Shandong Zhilin Environmental Protection Technology Co., Ltd.

High-efficiency plate heat exchangers in the petrochemical industry (Part 1)

Release time:

2020-07-27 09:37

Source:

High-efficiency plate heat exchangers are implemented using different switching plates and assembly methods, and can be divided into single-flow, multi-flow, and mixed-flow types. The type should be selected according to process requirements. Generally, for media with a temperature difference more than 1.8 times the logarithmic mean temperature difference, multi-flow should be used. The suitable value for the inter-plate flow velocity is 0.3~0.5m/s. If the flow velocity is too low, double-flow or multi-flow should be used.

High-efficiency plate heat exchangerIt is implemented using different reversing plates and different assembly methods, and can be divided into single-flow, multi-flow and mixed-flow. It should be selected according to process requirements. Generally, for media with a temperature difference more than 1.8 times the logarithmic mean temperature difference, multi-flow should be used. The suitable value of the inter-plate flow velocity is 0.3~0.5m/s. If the flow velocity is too low, double-flow or multi-flow should be used.

High-efficiency plate heat exchangerApplied to liquid heat exchange in pharmaceutical, food, and chemical industries. As well as pasteurization in certain applications.

In the petrochemical industry, the types and quantities of heat exchangers are very numerous, and they have very high requirements for pressure and temperature. High-efficiency plate heat exchangers can better cope with higher pressures and higher temperatures. Specifically, welded plate heat exchangers have strong convenience, small size, light weight, good heat transfer performance, and low price. Therefore, they have been well applied in offshore oil production. It can cool mechanical lubricating oil and fresh water, cool related intermediate products in oil fields, and also heat crude oil. In the petrochemical industry,High-efficiency plate heat exchangerThere are also certain bottleneck problems in its application, that is, it is difficult to accurately design and calculate the process flow. In the production practice of the petrochemical industry, huge economic losses often occur due to unreasonable process flow design.

To solve this problem, the resistance of plate heat exchangers used for cooling in the petrochemical industry can be analyzed by calculation. According to the characteristics of the heat exchanger and the heat transfer principle, the liquid phase along the flow channel is assumed to increase linearly on the wall, and the relationship formula between the flow channel length, the actual mass gas content, and the volume gas content is simulated, and it is close to the actual data. The cooling process in the petrochemical industry has partial state condensation, which will form a liquid film on the heat transfer surface. Therefore, when compact heat exchangers such as plate-fin types are selected, in order to achieve a reasonable and economical heat exchanger, the heat exchanger must be adjusted from the structural parameter perspective. Considering only the heat transfer area and the surplus is not perfect.

The spiral baffle heat exchanger is a modern and efficient heat exchange facility, which has been widely used in many countries and regions in the world. China's petrochemical industry has begun to promote the application of spiral baffle heat exchangers. At the same time, in the mid-1960s, mass production by roll-bed rolling was realized. At the same time, the development of spiral baffle heat exchanger technology in China has also been very rapid. Compared with traditional heat exchangers, spiral plate heat exchangers have many advantages. It can heat and cool alcohols, resins, urea, small molecule monomer polymer olefins, gasoline and diesel oil, ammonia water, chlorine water, brine, strong acids and bases, and nitrogen-hydrogen-ammonia mixtures, etc.

Introduction to the uses of highly efficient and intelligent heat exchangers

High-efficiency plate heat exchangers in the petrochemical industry (Part 2)