Composite phase change heat exchanging MGGH and waste heat recycling system

Abstract

The invention discloses a composite phase change heat exchanging MGGH system which is composed of an evaporation section heat exchanger, a desulfurization tower and a condensing section heat exchanger. High temperature flue gas sequentially passes through the evaporation section heat exchanger, the desulfurization tower and the condensing section heat exchanger; the evaporation section heat exchanger absorbs heat of the flue gas to generate steam, the steam is naturally transmitted to the condensing section heat exchanger through density difference to release heat in the condensing section heat exchanger to heat the flue gas, and the steam changes into condensation water to return to the evaporation section heat exchanger for heat absorption again, so that a closed cycle is formed. On thecondition that the temperature of the tail flue gas meets the demand, the generated steam can be partially supplied other working procedures, and at the same time, demineralized water supplementationis carried out on the evaporation section heat exchanger. Phase change heat exchange can effectively control the wall temperature of the heat exchanger to prevent the low temperature corrosion phenomenon. Redundant steam can be supplied to other working procedures to realize in-depth waste heat recycling of the flue gas while realizing MGGH.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to an MGGH with composite phase-change heat and a waste heat recovery system. [0002] technical background [0003] At present, in order to control the problem of wet smoke plume, my country's iron and steel, papermaking, electric power and other industries widely adopt the treatment method of reheating flue gas. However, in order to prevent low-temperature corrosion, the commonly used MGGH system is limited by the cooling range, and the residual heat of flue gas cannot meet heating needs. Contents of the invention [0004] The invention is an MGGH system with composite phase-change heat, which is composed of a heat exchanger in an evaporation section, a desulfurization tower, and a heat exchanger in a condensation section. The high-temperature flue gas passes through the evaporation heat exchange section, the desulfurization tower, and the heat exchanger in the ...

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Problems solved by technology

[0003] At present, in order to control the problem of wet smoke plume, my country's iron and steel, papermaking, electric power and other industries widely adopt the treatment method of reheating flue gas. However, in order to prevent low-temperature corrosion, the commonly used MGGH system is limited by the cooling range, and the residual heat of flue gas cannot Meeting heating needs

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