Heat exchanger with composite tube plate

Abstract

The invention relates to the field of machinery and chemical engineering, in particular to a heat exchanger with a composite tube plate, which comprises a shell, an upper tube plate, a lower tube plate, a heat exchange tube and a spiral tube, the upper tube plate and the lower tube plate are both mounted in the shell, one of the upper tube plate and the lower tube plate is the composite tube plate, the other one is a fixed tube plate, a sealing cavity is formed in the composite tube plate, and the spiral tube is fixed in the sealing cavity. The heat exchange pipes are fixedly connected with the upper pipe plate and the lower pipe plate and communicated with a sealing cavity of the composite pipe plate, the heat exchange pipes are located on the two opposite sides of the composite pipe plate, one end of the spiral pipe is fixedly communicated with the sealing cavity, and the other end of the spiral pipe is located outside the shell and provided with a small flange used for being connected with a working pipeline. The end socket, located at the end where the composite tube plate is located, of the shell is installed in a welding mode, the end, located at the fixed tube plate, of the shell is installed through a large flange, and through reasonable design, the cost of equipment is effectively reduced from multiple aspects.

Description

technical field [0001] The invention relates to the field of mechanization and chemical engineering, in particular to a heat exchanger with a composite tube sheet. Background technique [0002] In the condensers or heaters used in the chemical industry, most of the internal heat exchange tubes are φ19X2 or φ25X2.5 stainless steel tubes or carbon steel tubes. In the process, due to thermal expansion and contraction, these vertical heat exchange tubes will produce very large push-pull stress on the upper and lower tube sheets connected to them, which will cause deformation and distortion of the upper and lower tube sheets connected to them. If the tube sheets are twisted , it will cause the deformation of the shell of the condenser or heater welded with the tube sheet, and the deformation of the shell will cause the deformation of the flange welded with the shell, which will eventually lead to the failure of the flange seal, so in order to prevent the tube sheet from twisting ...

AI Technical Summary

Problems solved by technology

[0002] Condensers or heaters used in the chemical industry now, most of the internal heat exchange tubes are φ19X2 or φ25X2.5 stainless steel tubes or carbon steel tubes, less than a hundred During the heat exchange process, due to thermal expansion and contraction, these upright heat exchange tubes will generate a very large push-pull stress on the upper and lower tube sheets connected to them, which will make the connection The upper and lower tube sheets will be deformed and twisted. If the tube sheet is twisted, it will cause deformation of the condenser or heater shell welded to the tube sheet, and the deformation of the shell will cause the flange welded to the shell. The deformation will eventually lead to the failure of the flange seal. Therefore, in order to prevent the tube sheet from twisting and deforming, the thickness of the tube sheet is designed to be very thick. The thicker the tube sheet, the greater the rigidity, and the stronger the ability to prevent the deformation of the heat exchange tube, but the heat transfer The greater the force that the tube acts on the tube sheet, the greater the force transmitted to the condenser or heater shell through the tube sheet, and the stronger the ability to cause the shell to deform. Of course, the deformation of the shell will cause it to be welded together with the shell. The deformation of the flange may eventually lead to the failure of the flange seal. In order to prevent the failure of the flange seal, the flange should use a high-strength flange, which will increase the cost of materials and processing.

[0003]Because the tube sheet is too thick, there are dozens to hundreds of thousands of holes on the tube sheet for passing through the heat exchange tubes, which cannot be completed by laser Cutting, manual drilling is very slow and costly

Images