Wet desulphurization smoke dewatering reheating and afterheat using ultra-low emission system and method

Abstract

The invention discloses a fuel coal wet desulphurization smoke dewatering reheating and afterheat using ultra-low emission system and a method. A smoke cooler (1) recycles sensible heat of smoke discharged from a fuel coal boiler, the smoke temperature is reduced, and the recycled heat energy is circularly supplied to a smoke heater (5); the smoke gas after reducing temperature enters a desulfurizing tower (2) to perform desulfurizing treatment; the smoke after the desulfurizing treatment is performed with spraying, cooling and dewatering treatments, the potential heat released by smoke is recycled; the smoke after the spraying, cooling and dewatering treatments is discharged to the air after the atomizing heating treatment of the smoke heater (5). The system and method can effectively solve the problems of bringing water and pollutants for wet desulphurization smoke; the smoke after wet desulphurization is washed, demisted and dedusted by adopting the spraying method; thus the afterheat recycling and use in the smoke can be realized, the water content and dust content in the discharged smoke are reduced; the smoke plume is eliminated, the smoke dislocation is implemented, and massive water for desulphurization technique is saved.

Description

Technical field [0001] The invention relates to a coal-fired wet desulfurization flue gas waste heat utilization system and method, in particular to a coal-fired wet desulfurization flue gas dehydration and reheat waste heat utilization system and method. Background technique [0002] The development of industry and the modern life of mankind are inseparable from the demand for energy, especially the demand for electricity. With the increasingly severe problems of environmental pollution and energy shortages, while accelerating the development of renewable energy, mankind pays more attention to energy conservation and consumption reduction in traditional industries. Thermal power plants are both power generation companies and energy-consuming companies. How to improve the operating economy of thermal power plants and reduce energy loss and pollutant emissions has become a hot topic in domestic and foreign research. [0003] my country’s primary energy source mainly comes from coal...

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Problems solved by technology

[0009] However, it should be noted that my country's energy structure is different from that of most developed countries, and it is impossible to change in a short period of time; secondly, my country's geographical environment is different from that of foreign countries, such as Japan, Japan is an island country with an oceanic climate, and pollutants are very high. It is easy to diffuse; while my country is continental and has a vast territory. Due to climate change in recent years, it is difficult for pollutants to diffuse under unfavorable meteorological and geographical conditions; in addition, the water carried by the smoke and the pollutants contained in it are still If it is discharged into the air, it will eventually fall, especially when it floats at low altitude and forms smog, which will pollute the environment.

[0010] Another key issue that cannot be ignored is that our country has a large population and rapid economic development. The superimposed emissions of desulfurized flue gas by many enterprises in the region will be huge, resulting in huge emissions in the process of rapid development. unfavorable factors

[0011] At the same time, the flue gas is heated and discharged, the remaining heat cannot be used, and energy loss is caused, which is not conducive to the operation economy and energy utilization of thermal power plants

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