Plate-fin thermal electricity generating heat exchanger

Abstract

The invention relates to a plate-fin thermal electricity generating heat exchanger comprising cooling passage heat exchanging plates, cooling passage fins, heating passage heat exchanging plates, heating passage fins, copper sheets and power supply electrodes. the cooling passage fins and the heating passage fins of the same layer are vertically continuous fins prepared from P-type thermoelectric material and N-type thermoelectric material; ends of adjacent fins are in series connection through the copper sheets; fins at two sides are connected to a load circuit through power supply electrodes of a heat exchanging plate of the same layer; the power supply electrodes of heat exchanging plate of all layers are in series or parallel connection. The cooling passage heat exchanging plates and heating passage heat exchanging plates of the heat exchanger are prepared from metal material or ceramic material; cooling passage fins and heating passage fins are prepared from one or more thermoelectric materials. Cold fluid and hot fluid are alternatively arranged in a countercurrent flow heat exchanging mode. The heat exchanger of the invention can be applied in used heat recovery and used heat power generation, which can increase the power generation temperature difference of thermal electricity generating members and has high heat exchanging and electricity generating performance.

Description

technical field [0001] The invention relates to a waste heat recovery and waste heat power generation device based on thermoelectric materials, in particular to a plate-fin thermal power generation heat exchanger used in the fields of energy, chemical industry, metallurgy and automobiles. Background technique [0002] The waste heat recovery and power generation device combined with thermoelectric materials and heat exchangers is a low-cost waste heat recovery and energy-saving device with wide application prospects in the fields of energy, chemical industry, metallurgy and automobiles, but its low thermoelectric conversion efficiency limits the device. wide-scale promotion. [0003] Traditional thermoelectric material power generation devices often place commercial thermoelectric power generation devices in the interlayer of high-temperature heat exchangers and low-temperature heat exchangers. This structure has some defects. On the one hand, the thermal conductivity of th...

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Problems solved by technology

On the one hand, the thermal conductivity of thermoelectric materials is very small, and there is also the influence of contact thermal resistance, which will lead to low heat transfer efficiency of thermoelectric material power generation devices, which is far from the heat transfer efficiency of heat exchangers without thermoelectric power generation devices. ; On the other hand, as the temperature difference between the two sides of the high and low temperature heat exchanger decreases, the temperature difference between the two ends of the thermoelectric power generation device decreases, resulting in a significant decrease in power generation efficiency

Many scholars at home and abroad have proposed new thermoelectric power generation and heat exchange devices. For example, Tada et al. of Tokyo Institute of Technology proposed a new type of porous thermoelectric structure, which uses high-temperature convective heat exchange instead of heat conduction to maintain temperature difference. Problems: ①The forced convective heat transfer of the porous structure will produce a large flow resistance, and the pump work consumed to maintain the flow offsets most of the system power generation; ②The machinability of porous thermoelectric materials is poor, compared with traditional cuboids, rods, etc. The manufacturing cost of simple structure thermoelectric materials is much higher

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