Power plant boiler flue gas waste heat utilization system with balanced flow

Abstract

The invention provides a power plant boiler flue gas waste heat utilization system. The power plant boiler flue gas waste heat utilization system comprises a plurality of parallel heat pipes, a flue gas passage and an air passage, the heat pipes comprise evaporating ends and condensing ends, and the condensing ends are formed in the air passage; the evaporating ends are formed in the flue gas passage; the evaporating ends absorb waste heat of flue gas in the flue gas passage, and the heat is transferred to air in the air passage through the condensing ends; and the preheated air enters a boiler furnace for combustion supporting, and flow uniformizing pipes are arranged between the at least two adjacent heat pipes. According to the power plant boiler flue gas waste heat utilization system,a waste heat utilization device with a novel type structure is provided, and by arranging the flow sharing pipes between the heat pipes, evenness of the pressure, even distribution of the fluid flow and even distribution of fluid moving resistance in all the heat pipes are guaranteed.

Description

technical field [0001] The present invention is a part of the subject project jointly researched and developed with the enterprise, relates to the field of waste heat recovery of heat pipes, in particular relates to a method and device for recovering waste heat of flue gas by using heat pipes. Background technique [0002] With the rapid development of my country's economy, energy consumption is increasing day by day, and the problem of deteriorating urban air quality is becoming more and more prominent. It is urgent to save energy and reduce the emission of harmful environmental substances. In the common steam generation process, one of the main reasons for high energy consumption and serious pollution is that the exhaust temperature of boiler flue gas is too high, which wastes a lot of energy. Therefore, the waste heat of boiler exhaust gas is recovered and reused to achieve energy saving and emission reduction. purpose, while protecting the environment. However, in the p...

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Problems solved by technology

During the evaporation process of the heat pipe, it will inevitably carry liquid to the steam end. At the same time, because of the exothermic condensation of the condensation end, there will be liquid in the condensation end, and the liquid will inevitably mix with the steam, so that the fluid in the heat pipe is vapor. Liquid mixture, the existence of vapor-liquid mixture causes the gas to mix together, and the heat exchange capacity between the liquid and the liquid decreases, which greatly affects the heat exchange efficiency

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