Shell and tube heat exchanger
Pressure vessel (yālì ró ng qì), English: pressure vessel refers to a closed device that contains gas or liquid and carries a certain pressure. In order to implement scientific management and safety inspection more effectively, pressure vessels are divided into three categories according to working pressure, medium harmfulness and its role in production in China's Pressure Vessel Safety Supervision Regulations. And for each category of pressure vessels in the design, manufacturing process, as well as inspection items, content and methods to make different provisions. Pressure vessels have implemented the safety and quality licensing system for imported goods, and goods that have not obtained the import safety and quality license are not allowed to be imported. According to the latest TSG21-2016 "Safety and Technical Supervision Regulations for Fixed Pressure Vessels", it should be divided into the first group of media and the second group of media according to the media, and then classified into categories I, II and III according to the pressure and volume. The so-called first, second and third categories of the old capacity regulations are no longer applicable.
A pressure vessel is a closed container that can withstand pressure. The use of pressure vessels is extremely wide, it has an important position and role in many sectors such as industry, civil, military and many other fields of scientific research. Among them, the pressure vessels used in the chemical industry and petrochemical industry are the most, and the pressure vessels used in the petrochemical industry alone account for about 50% of the total number of pressure vessels. Pressure vessels are mainly used for heat transfer, mass transfer, reaction and other technological processes in the chemical and petrochemical fields, as well as storage and transportation of pressurized gases or liquefied gases; they are also widely used in other industrial and civil fields, such as air compressors. All kinds of special compressors and auxiliary machines of refrigeration compressors (coolers, buffers, oil-water separators, gas storage tanks, evaporators, liquid coolant storage tanks, etc.) are pressure vessels.
Key words:
Shell and tube heat exchanger
Shell and tube heat exchanger
Classification:
Product Introduction
shell and tube heat exchanger]
Shell-and-tube heat exchanger is a general process equipment for heat exchange operation, which is widely used in chemical, petroleum, petrochemical, electric power, light industry, metallurgy, atomic energy, shipbuilding, aviation, heating and other industrial sectors, especially in petroleum refining and chemical processing equipment, occupies an extremely important position.
Shell and tube heat exchanger is the most widely used heat transfer equipment, the main advantage is that the unit volume has a large heat transfer area and heat transfer effect is better, long service life. In addition, the structure is simple, the range of materials manufactured is wide, and the operating elasticity is also large. Therefore, shell and tube heat exchangers are mostly used in high-pressure and large-scale devices.
classification of shell and tube heat exchanger:
According to the material is divided into carbon steel tube shell heat exchanger, stainless steel tube shell heat exchanger and carbon steel and stainless steel mixed shell and tube heat exchanger three; according to the form is divided into fixed tube plate, floating head, U tube heat exchanger, etc.; according to the structure is divided into single tube pass, double tube pass and multi tube pass. Heat transfer area of 1~3500 ㎡, can be customized according to user needs.
Structure principle and characteristics of shell and tube heat exchanger:
fixed tube sheet heat exchanger:
The so-called fixed tube plate means that the tube plates at both ends and the shell are connected integrally, so it has the advantages of simple structure and low cost. However, because the shell side is not easy to repair and clean, the shell side fluid should be relatively clean and not easy to scale the material. When the temperature difference between the two fluids is large, thermal compensation should be considered.
Floating head heat exchanger structure principle, characteristics:
The tube plate of the floating head heat exchanger is fixed to the shell at one end, and the tube plate at the other end can float freely in the shell. The shell and the tube bundle are free for thermal expansion, so when the temperature difference between the two media is large, there is no temperature difference stress between the tube bundle and the shell. The floating head end is designed as a detachable structure, so that the tube bundle can be easily inserted or withdrawn, which provides convenience for maintenance and cleaning. This type of heat exchanger is especially suitable for the shell and heat exchange tube temperature difference stress is large, and the shell and tube side are required to be cleaned. The structure of this heat exchanger is more complex, the metal consumption is more, the cost is higher.
U-tube heat exchanger:
The heat exchange tubes of the U-tube heat exchanger are bent into a U-shape, and the two ends of the heat exchange tubes are fixed on the same tube plate, so each heat exchange tube can freely expand and contract, regardless of other heat exchange tubes and shells. This type of heat exchanger structure is relatively simple, light weight, suitable for high temperature and high pressure occasions.
We can choose the most suitable heat exchanger structure according to the actual engineering needs of customers.
Pressure vessel (yālì ró ng qì), English: pressure vessel refers to a closed device that contains gas or liquid and carries a certain pressure. In order to implement scientific management and safety inspection more effectively, pressure vessels are divided into three categories according to working pressure, medium harmfulness and its role in production in China's Pressure Vessel Safety Supervision Regulations. And for each category of pressure vessels in the design, manufacturing process, as well as inspection items, content and methods to make different provisions. Pressure vessels have implemented the safety and quality licensing system for imported goods, and goods that have not obtained the import safety and quality license are not allowed to be imported. According to the latest TSG21-2016 "Safety and Technical Supervision Regulations for Fixed Pressure Vessels", it should be divided into the first group of media and the second group of media according to the media, and then classified into categories I, II and III according to the pressure and volume. The so-called first, second and third categories of the old capacity regulations are no longer applicable. A pressure vessel is a closed container that can withstand pressure. The use of pressure vessels is extremely wide, it has an important position and role in many sectors such as industry, civil, military and many other fields of scientific research. Among them, the pressure vessels used in the chemical industry and petrochemical industry are the most, and the pressure vessels used in the petrochemical industry alone account for about 50% of the total number of pressure vessels. Pressure vessels are mainly used for heat transfer, mass transfer, reaction and other technological processes in the chemical and petrochemical fields, as well as storage and transportation of pressurized gases or liquefied gases; they are also widely used in other industrial and civil fields, such as air compressors. All kinds of special compressors and auxiliary machines of refrigeration compressors (coolers, buffers, oil-water separators, gas storage tanks, evaporators, liquid coolant storage tanks, etc.) are pressure vessels.
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Jirong Thermal
Address: No. 18 Huaxin Road, Licheng District, Jinan City