A method for recovering waste heat from flue gas

Abstract

The invention discloses a flue gas waste heat recovery method. The processing steps of the recovery method are as follows: heat exchange is carried out through a high-temperature waste heat carrier and low-temperature saturated steam in a steam heat exchange mode for pre-heat-exchange first, then the high-temperature waste heat carrier enters a water cooling tower, heat transfer and heat exchange are conducted by means of heat-transfer media, a more reasonable multi-return-stroke heating method is adopted to carry out stepped heat transfer and temperature reduction ultimately on the basis that the heat-transfer media are utilized, heat of different potential temperatures of the high-temperature waste heat carrier is reasonably used, the high-temperature waste heat carrier is prevented from discharging overtemperature, and waste heat can be made full use of. According to the flue gas waste heat recovery method, high-temperature waste heat consumption of waste heat products of unit weight becomes low, efficient and comprehensive utilization of high-temperature waste heat and low-temperature waste heat is achieved, the waste heat recovery effect is good, influences of flue gas moisture content and flue gas temperature fluctuation are effectively eliminated, and a satisfying waste heat recovery effect can be reached; the stepped heat transfer and temperature reduction method is adopted, the high-temperature waste heat carrier is prevented from discharging overtemperature, and the waste heat is made full use of.

Description

technical field [0001] The invention relates to a recovery method, in particular to a recovery method for flue gas waste heat. Background technique [0002] In the process steps of the prior art, the high-temperature parts will emit a large amount of heat during the cooling process, resulting in a large amount of energy waste and polluting the environment. The traditional waste heat recovery devices and methods have the disadvantages of low efficiency and short life. Can no longer meet people's requirements. Contents of the invention [0003] The purpose of the present invention is to provide a flue gas waste heat recovery method to solve the shortcomings of the prior art. [0004] The present invention adopts following technical scheme to realize: [0005] A method for recovering waste heat from flue gas, characterized in that the process steps of the recovery method are as follows: [0006] Steam heat exchange: collect high-temperature waste heat carrier, and use the ...

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Problems solved by technology

[0002] In the process steps of the prior art, the high-temperature parts will emit a large amount of heat during the cooling process, resulting in a large amount of energy waste and polluting the environment. The traditional waste heat recovery devices and methods have the disadvantages of low efficiency and short life. Can no longer meet people's needs