System and method for enhancing heat transfer and online descaling of micro-channel heat exchanger

Abstract

The invention discloses a system and a method for enhancing heat transfer and online descaling of a micro-channel heat exchanger. The system comprises a particle feeding device, a particle separation device and a downstream filter; the particle feeding device comprises a particle separator I, the output of the particle separator I is connected with a particle storage tank I, the output end of the particle storage tank I is connected with a valve II, and the input end of the particle storage tank I is connected with the valve I; the particle separation device comprises a particle separator II, the output of the particle separator II is connected with a particle storage tank II, the input end of the particle storage tank II is connected with a valve III, and the output end of the particle storage tank II is connected with a valve IV; and the output end of the particle feeding device is connected with the input end of the particle separation device through the micro-channel heat exchanger, and the output end of the particle separation device is connected with the input end of the particle feeding device to form a circulating system. According to the system, online descaling and enhanced heat transfer are achieved, and the advantage of high efficiency of the micro-channel heat exchanger is maintained under the condition that the cleanliness of heat exchange fluid is poor.

Description

technical field [0001] The invention relates to the technical field of flow heat transfer, in particular to a system and method for enhancing heat transfer and online descaling of a microchannel heat exchanger. Background technique [0002] Microchannel heat exchangers represented by printed circuit board heat exchangers have the advantages of high heat transfer efficiency, high compactness, high response speed, and the ability to withstand high temperature and high pressure working conditions, replacing traditional heat exchangers in more and more fields. Shell and tube heat exchangers have become a better choice, such as regenerators and precoolers in supercritical carbon dioxide Brayton cycle power generation systems, liquefied natural gas vaporizers, etc. The diameter of the heat exchange channel of the microchannel heat exchanger is only a few millimeters. When the heat exchange fluid is not clean enough, the wall of the heat exchange channel is prone to fouling, which ...

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Problems solved by technology

[0003] In order to overcome the above technical problems, the object of the present invention is to provide a system and method for enhancing heat transfer and online descaling of microchannel heat exchangers. Micro-solid particles are added to the heat exchange fluid to form a liquid-solid mixture in the heat exchange channel. Phase flow, destroying the flow boundary layer and eroding the wall surface to deposit dirt, so as to achieve online descaling and enhanced heat transfer, so that the advantages of high efficiency of the microchannel heat exchanger can be maintained in the case of poor cleanliness of the heat exchange fluid

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