Novel plate type air preheater

Abstract

The invention relates to a novel plate type air preheater, and belongs to the field of heat exchangers. The novel plate type air preheater comprises a heat exchange core with corrugated plates, an air preheater shell, flue gas inlet and outlet pipelines and air inlet and outlet pipelines. A plurality of groups of plate bundles are stacked up in a certain manner to form the heat exchange core with the corrugated plates. Two corrugated plates are welded together in a plane zone to form each plate bundle, flue gas elliptical tubular channels are formed by the plate bundles, the plate bundles are stacked up in the planar zones and then are welded to form air shell-side channels, and heat can be exchanged between two types of media in a cross-flow manner. The novel plate type air preheater has the advantages that the novel plate type air preheater is compact in structure, high in heat transfer efficiency, long in service life, convenient to machine and low in cost, and is high-temperature-resistant and high-pressure-resistant; air flue of the novel plate type air preheater flows through the elliptical straight channels and is low in flowing resistance as compared with a tubular air preheater and a finned tube air preheater; the novel plate type air preheater cannot be contaminated by dust, and the dust can be easily cleaned even of the novel plate type air preheater is contaminated by the dust.

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 novel plate-type air preheater. Background technique [0002] At present, the air preheaters 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 air preheater has poor heat transfer capacity, consumes a lot 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. , affecting the life of the air preheater. [0003] In the prior art, there are few reports on the plate air preheater, and the plate heat exchanger has the characteristics of compact s...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new plate type air preheater for power plant boilers in order to overcome the disadvantages of poor heat transfer capacity, easy dust accumulation, and large flow resistance of existing finned tube and tube air preheaters. The heater 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. Corrugated channel, enhanced turbulence, improved heat transfer efficiency, simple structure, low production cost

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