Composite-planar gas heat energy exchanger

Abstract

The invention relates to a composite-planar gas heat energy exchanger. The composite-planar gas heat energy exchanger comprises a corrugated plate heat exchange core body, a heat energy exchanger housing, a smoke inlet-outlet port pipeline and an air inlet-outlet port pipeline. The corrugated plate heat exchange core body is formed through stacking a plurality of groups of plate bundles in a certain form. Each plate bundle is formed through welding two corrugated plates together in a plane area, and a quasi-elliptical-tubular smoke channel is formed; each two plate bundles are stacked in the plane area and then welded to form an air shell-side channel; and two mediums exchange heat in the form of cross flow. The novel plate-type air pre-heater provided by the invention is compact in structure, high in heat transfer efficiency, resistant to high temperature and high pressure, long in service life, convenient to machine and low in cost. Compared with tube-type air pre-heaters and finned-tube-type air pre-heaters, according to the planar gas heat energy exchanger, smoke passes through an elliptical straight channel, so that the planar gas heat energy exchanger is low in flow resistance and not liable to be stained with ash, and ash removal is easily carried out even if in the case that the planar gas heat energy exchanger is stained with ash.

Description

technical field [0001] The invention belongs to the technical field of waste heat recovery and energy-saving equipment for power plant boilers, and relates to a composite planar gas heat exchanger. Background technique [0002] At present, the heat exchangers used in power plant boilers are mainly tube type and finned tube type. The air goes in the pipe, and the flue gas passes through the fan to blow the pipe to realize heat exchange. Cross-flow heat exchange is adopted between flue gas and air. However, this kind of heat exchanger has poor heat transfer capacity, consumes a large amount of pipes, occupies a large area, and because the flue gas is in vertical contact with the heat exchange tubes, the flow resistance increases, dust is easy to accumulate, and the wear of the heat exchange tubes increases. affect the life of the heat exchanger. [0003] In the prior art, there are few reports on the composite planar gas heat exchanger, and the plate heat exchanger has the ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of poor heat transfer capacity, easy dust accumulation and large flow resistance of current finned tube and tube heat exchangers, thereby providing a composite planar gas heat exchanger for power plant boilers. The device has a compact structure and an enlarged heat transfer area. The flue gas travels through an elliptical straight channel, which reduces the flow resistance of the flue gas side. channel, enhanced turbulence, improved heat transfer efficiency, simple structure and low production cost

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