Recently, at the "2013 (Third) National Petroleum and Chemical Heat Exchanger Technology and Equipment Exchange Conference" held in Wuxi, Chen Sunyi, a professor-level senior engineer of Maoming Gravity and Petrochemical Machinery Manufacturing Co., proposed: If the two traditional structures The advantages of the welding seal and the diaphragm seal spherical diaphragm seal technology used in the end of the high-parameter heat exchanger tube port seal, should be made of simple, reliable sealing effect.
With the development of petrochemicals and coal chemical industry, the application of high-temperature, high-pressure, high-pressure medium and large-diameter and large-flow high-parameter heat exchangers in installations has become more and more. Traditional port sealing technologies are facing new challenges. For example, high temperature and high pressure hydrogen plant heat exchanger tube box seal used in a variety of structures, ranging from the traditional long-necked flange structure to the threaded locking ring seal or its simplified internal and external two-ring bolt seal structure, and then Ω ring seal Structure, have occurred in the case of leakage tube box.
Conventional welding seal used in harsh and often disassembled flange connection parts, can not place the gasket, the structure is simple, this does not belong to the gasket seal structure is more reliable than the general high-pressure gaskets for high temperature operation or temperature difference Large changes in the heat exchanger. On the other hand, the diaphragm seal in the pipeline valves and other pipe fittings has a long history of application, reliable technology.
Spherical diaphragm sealing technology to reduce the sealing surface, reliable welding seal, and the middle part of the diaphragm has a certain elasticity, elastic deformation protection seal welding. Simple structure. Manufacturing, installation period is short, easy to maintain, the total cost is low. In addition, the general selection of austenitic stainless steel spherical diaphragm, for some media can also play a role in corrosion lining.
Chen Sun Ye pointed out that the spherical diaphragm seal is a relatively new structure of the seal technology, although the foreign countries have good engineering applications, but China's domestic understanding and application of the technology has just started, but also need to further understand and understand.
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