Full-scale implicit diffusion welding plate type heat exchanger

Abstract

The invention relates to a heat exchanger, in particular to a full-scale implicit diffusion welding plate type heat exchanger. The heat exchanger comprises a heat exchange core body and an end cover, the heat exchange core body is formed by alternately stacking cold fluid plates and hot fluid plates, fluid plate through holes are formed in the cold fluid plates and the hot fluid plates, and the fluid plate through holes are overlapped to form a buffer tube box capable of containing corresponding fluid; fluid channels on the cold fluid plates and the hot fluid plates are connected with the fluid plate through holes in a staggered mode and connected into the buffer tube box; the two ends of the heat exchange core body are sealed through end covers; and fluid inlets and outlets for fluid in the heat exchange core body to flow in and out are formed in the end covers. By arranging the buffer tube box, the round-trip fluid channels are in transition connection through the buffer tube box, the fluid channel layout limitation caused by the minimum bending radius is overcome, the fluid channels can be distributed on the heat exchange plates in a full-scale mode and used in cooperation with the fluid tube box, the heat exchanger does not need to be provided with external tube boxes, the structure is compact, and the pressure bearing capacity, the safety and the reliability are improved.

Description

technical field [0001] The invention relates to a heat exchanger, in particular to a full-scale implicit diffusion welded plate heat exchanger. [0002] technical background [0003] Heat exchangers used in nuclear power, fossil energy, natural gas, solar energy, hydrogen energy, waste heat recovery and other fields have increased the requirements for high efficiency, low pressure drop, high reliability, compactness, high temperature and high pressure resistance. [0004] The traditional diffusion welded plate heat exchanger needs to set up a large external tube box, especially under high temperature and high pressure conditions. In order to ensure safety and meet the strength calculation requirements of the tube box, sufficient space must be reserved for the external tube box when designing the fluid plate. The layout space of the fluid channels on the fluid plate is limited, the utilization rate of the fluid plate is not high, the size of the fluid plate required for the co...

AI Technical Summary

Problems solved by technology

[0004] The traditional diffusion welded plate heat exchanger needs to set up a large external tube box, especially under high temperature and high pressure conditions. In order to ensure safety and meet the strength calculation requirements of the tube box, sufficient space must be reserved for the external tube box when designing the fluid plate. The layout space of the fluid channels on the fluid plate is limited, the utilization rate of the fluid plate is not high, the size of the fluid plate required for the combined heat exchange core increases, the number of layers increases, and the external tube box structure makes the traditional diffusion welded plate heat exchange The device is large in size and takes up a lot of space

In addition, the fluid channel of the fluid plate of the traditional diffusion welded plate heat exchanger is mostly designed as a single straight line or Z-shaped, the path of the fluid flow is limited to the length of the fluid plate, the total path of the fluid is short, and the temperature gradient per unit length is relatively small. Large, resulting in a large thermal stress on the fluid plate, and the mixed heat transfer of countercurrent and cross-flow is mainly used, that is, pure countercurrent heat transfer cannot be achieved, resulting in low heat transfer efficiency

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