Diversion type low-flow-resistance heat pipe heat exchanger

Abstract

A flow guide type low-flow-resistance heat pipe heat exchanger comprises a heat pipe heat exchanger box body, a pipe plate and a flow guide type low-flow-resistance heat pipe bundle.

Description

Technical field [0001] The present invention relates to the application of heat pipe technology in the field of flue gas waste heat recovery and utilization, specifically a diversion type low-flow resistance heat pipe heat exchanger. Background [0002] At present, the heat pipe heat exchanger technology in coal-fired power plants, coal chemical industry, cement plants, blast furnace gas and other fields of flue gas waste heat utilization, due to the improvement of environmental emission standards, the system out of stock using SCR process, there is ammonia escape, the original flue gas is rich in NH4HSO4, the traditional wall heat exchanger technology in this field of application process encountered viscous ash blockage, low temperature corrosion increasing and other technical problems, although the heat pipe heat exchanger technology in the process of solving the above problems, showing good characteristics, but, currently in the field of flue gas waste heat utilization , wheth...

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Problems solved by technology

[0002] At present, heat pipe heat exchanger technology is used in the utilization of flue gas waste heat in coal-fired power plants, coal chemical industry, cement plants, blast furnace gas and other fields. Rich in NH4HSO4, the application of traditional wall heat exchanger technology in this field has encountered technical problems such as sticky ash plugging and low-temperature corrosion. Although heat pipe heat exchanger technology has shown good characteristics in solving the above problems, However, at present, in the field of flue gas waste heat utilization, whether it is a heat pipe low-pressure economizer, a heat pipe air preheater, or a rotary air preheater low-temperature section using heat pipe technology, the heat pipe on the flue gas side of the heat exchanger adopts The most is a circular tube structure. In order to reduce the flow resistance of the flue gas side and the sticky ash blockage, although the flue gas side adopts a smooth tube measure, it has been verified by actual operation that when the flue gas side has a large diameter and the heat exchanger tube When the pitch design is small, it will still lead to large flow resistance on the flue gas side and aggravated ash blockage, especially when a heat pipe with a larger diameter is used to increase the axial heat transfer power of a single heat pipe, the resistance increase is particularly obvious

Although part of the flue gas flow resistance can be weakened when the heat exchanger is designed with a larger tube pitch, it is necessary to ensure that the heat exchange power of the heat pipe heat exchanger cannot be reduced, that is, the number of heat pipes cannot be reduced, and the actual technical transformation is implemented. Adapt to the inherent space of the existing equipment, and after the flue gas side adopts the light pipe, the convective heat transfer coefficient outside the pipe is greatly reduced. In order to ensure the heat transfer, the number of heat pipes must be increased, which brings two problems. One is that it can be used The space is insufficient, and the second is that the heat transfer and heat transfer power cannot meet the requirements. How to solve this contradiction, smoothly apply the heat pipe technology to the heat exchange of low-temperature flue gas in coal-fired power plants, and solve the problems existing in the waste heat recovery and utilization process of the original flue gas The problems of sticky ash blockage, increasing flue gas flow resistance, and insufficient pressure head of fans will be problems that need to be solved

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