Pure countercurrent plate heat exchanger adopting asymmetric heat exchange plates

Abstract

The invention discloses a pure countercurrent plate heat exchanger adopting asymmetric heat exchange plates, which comprises a heat exchange group plate, the heat exchange group plate comprises a plurality of heat exchange plates which are overlapped layer by layer and are arranged at intervals, a plurality of heat exchange channels are formed among the plurality of heat exchange plates, and the plurality of heat exchange channels comprise a plurality of flue gas channels and a plurality of air channels which are arranged in a staggered manner; baffling group plates used for turning air are arranged at the two ends of the heat exchange group plates, each baffling group plate comprises a plurality of baffling channels arranged at intervals, the multiple baffling channels at the two ends of the heat exchange group plates communicate with the two ends of the multiple air channels correspondingly, drainage boxes are arranged at the ends of the baffling channels, and the multiple baffling channels are gathered through the drainage boxes. The heat exchange plates are provided with a plurality of supporting dimples used for supporting the heat exchange plates, a plurality of ball socket dimples used for enhancing the heat exchange efficiency and a plurality of flow guide dimples used for reducing flowing dead zones. According to the scheme, pure reverse flow type heat exchange of smoke and air is achieved, and meanwhile the heat exchange efficiency of the heat exchanger is high.

Description

technical field [0001] The invention relates to the technical field of flue gas heat exchange, in particular to a pure countercurrent plate heat exchanger using asymmetrical heat exchange plates. Background technique [0002] The metallurgical heating furnace industry generally adopts tube-and-tube heat exchangers to recover the waste heat of high-temperature flue gas at the tail, but this kind of air preheater has poor heat transfer capacity, consumes a lot of pipes, occupies a large area, and due to the flue gas and heat exchange The tubes are in vertical contact, resulting in increased flow resistance, easy dust accumulation and increased wear of the heat exchange tubes, which affects the life of the air preheater. [0003] The plate heat exchanger has the characteristics of compact structure, small footprint and high heat transfer efficiency. Heat exchange equipment with corrugated plates as heat transfer elements represents the mainstream development direction of heat e...

AI Technical Summary

Problems solved by technology

[0004] However, plate heat exchangers traditionally used in gas-gas heat exchange (such as high-temperature flue gas preheating cold air) basically adopt the form of cross-flow heat transfer. According to the principle of heat transfer, compared with pure counter-flow heat transfer The recovery of flue gas waste heat is insufficient, and the same heat load cross-flow heat exchanger requires a larger heat exchange area and higher equipment costs

Moreover, the heat exchange plates used in the existing flue gas plate heat exchangers are smooth flat plates or ordinary corrugated plates, and there is no optimal design of the plate structure for different application situations.

[0005] It can be seen from the structure of the heat exchanger in the prior art that the surface for countercurrent heat exchange is only the boundary surface of the cold fluid and the hot fluid on both sides, the heat exchange area is small, and the waste heat of the hot fluid cannot be fully recovered, and the hot fluid turns vertically in the flow channel Many times, the pressure loss of thermal fluid is large

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