Heat exchange method and structure for fluid and heat recovery system for waste water

Abstract

The invention relates to the technical field of heat exchange, in particular to a heat exchange method and structure for fluid and a heat recovery system for waste water. The heat exchange method is characterized in that cold flow and heat flow are separated through a heat exchange dividing wall, the heat exchange dividing wall is of a thin-wall cylinder-shaped structure extending in the axial direction, one of the cold flow and the heat flow continuously rotates around the axis of a cylinder while rising in the axial direction of the cylinder on the inner side of the heat exchange dividing wall, and the other one of the cold flow and the heat flow continuously rotates around the axis of the cylinder while rising in the axial direction of the cylinder. And the other one continuously rotates around the axis of the column body while descending along the axial direction of the column body on the outer side of the heat exchange dividing wall, and exchanges heat through the heat exchange dividing wall. Cold flow and hot flow strengthen heat exchange through reverse convection, and meanwhile two effects are generated through rotating motion, one effect is that the flowing direction of fluid is continuously changed in the circumferential direction, so that turbulent flow is generated, and the heat exchange efficiency is improved; and secondly, the heat exchange stroke of the fluid is prolonged, so that the heat exchange effect is further improved.

Description

technical field [0001] The invention relates to the technical field of heat exchange, in particular to a heat exchange method and structure for fluid and a heat recovery system for waste water. Background technique [0002] The problem of heat recovery of wastewater has always been a technical content that has been widely concerned. For example, the discharge temperature of bathing wastewater is 32-37 °C, the temperature of printing and dyeing wastewater can reach 80-100 °C, and the wastewater discharged from the bath exceeds 100 tons per day. It is as high as thousands of tons or even tens of thousands of tons. If this part of the heat can be recovered, it will undoubtedly be of great significance. [0003] As we all know, the thermal conductivity of liquid is poor. For example, the thermal conductivity of water is only 1W / m·K. Therefore, liquid heat exchange usually adopts large area and small spacing to improve heat exchange efficiency. Impurities are often mixed in hot ...

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Problems solved by technology

[0005] The above-mentioned patent uses corrugated pipes to manufacture heat recovery pipes. Although it can strengthen the turbulent flow of waste water, it is easy to cause fouling in the grooves of the corrugated pipes, thereby affecting the heat exchange efficiency; although a compressed air pipe is installed as a cleaning device, for For dense corrugated grooves, it cannot effectively ensure that each groove can be cleaned in place

At the same time, the above-mentioned patent uses the method of soaking the heat recovery pipe in the sewage pipe to realize heat exchange. The heat recovery pipe is arranged as a spiral pipe to extend the heat exchange stroke, but the linear motion of the sewage has a limited stroke, which is in the The sewage at the axis passes through the heat recovery pipe in an instant, and no effective heat exchange is obtained

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