Lower plate sealing structure of gas-gas heat exchanger

Abstract

The invention discloses a lower plate sealing structure of a gas-gas heat exchanger, and relates to the technical field of end plates of heat-exchange equipment. The lower plate sealing structure comprises a heat exchange pipe limiting part and a lower plate high-pressure gas sealing part located above the heat exchange pipe limiting part; the heat exchange pipe limiting part comprises a first lower hole plate and a limiting protrusion, and the lower end of a heat exchange pipe is provided with a limiting part matched with the limiting protrusion; and the lower plate high-pressure gas sealing part is located in interlayer space between a first lower hole plate and a second lower hole plate, and comprises a part of heat exchange pipe and a lower plate sealing sleeve connected to the heat exchange pipe in a sleeving manner. By means of the sealing structure, the heat exchange pipe and the lower hole plates form a clamped structure, the heat exchange pipe is limited only during shrinkage, the problem of material fatigues at the welding position can be avoided while shrinkage of the heat exchange pipe is avoided, and the lower plate sealing structure is simple in structure and durable.

Description

technical field [0001] The invention relates to the technical field of end plates of heat exchange equipment, in particular to a lower plate sealing structure of a gas-gas heat exchanger. Background technique [0002] With the depletion of oil and coal, energy issues are becoming more and more prominent in front of people. In addition to the development of new energy sources, the conservation and reuse of existing energy sources have also become the focus of people's research. [0003] In energy utilization technology, a heat exchanger is a device for exchanging heat between hot and cold fluids without direct contact. The tube-type gas-gas heat exchanger has a wide range of applications in the fields of coal-fired boilers, waste incineration power generation, etc. Applications. [0004] In the prior art, only metal plates are often used to separate the flue gas, which will easily cause corrosion of the plates after a long time, and the seals are also prone to failure when e...

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Problems solved by technology

[0004] In the prior art, only metal plates are often used to separate the flue gas, which will easily cause corrosion of the plates after a long time, and the seals are also prone to failure when they are exposed to the flue gas environment for a long time

[0005] People use heat exchange tubes made of PTFE to overcome the problem of flue gas corrosion. In large-flux heat exchangers, heat exchange tubes with large sizes and long lengths are often used. The thermal expansion and contraction of the heat exchange tubes, that is, the expansion and contraction of the heat exchange tubes on the bottom plate, is more serious. Once they shrink into the shell side of the heat exchanger, it will cause the mixing of hot and cold fluids and destroy the operation of the entire production line.

[0006] The Chinese utility model patent with the authorized announcement number CN 202814194 U discloses a bottom plate of a tubular air-gas heat exchanger, which includes a bottom orifice plate, and heat exchange tubes are welded on the bottom orifice plate to fix the heat exchange tubes. Prevent it from shrinking back into the shell side of the heat exchanger. This method uses a welding process, which is troublesome, and the heat exchange tube has no room to move. After long-term use, the material at the weld is prone to fatigue and breakage, which affects heat transfer. service life of the device

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