Ultra-low emission device and method for sintering and pelletizing flue gas

Abstract

The invention relates to a sintering and pelletizing flue gas ultralow emission device and method. The technology of an MGGH heat collector, a limestone-gypsum method desulfurization tower, a wet type electrostatic dust collector, a flue gas condensation deacidification device, an MGGH heater, a GGH, a direct combustion type combustor and SCR denitration is adopted. The tray and the flow guide ring are arranged in the desulfurization tower, so that flue gas is uniformly distributed, the desulfurization efficiency is improved, and sulfur dioxide and dust are greatly removed; a set of flue gas deacidification demister system is arranged at an outlet section of the wet-type electric precipitator, the temperature of flue gas is reduced by more than 4 DEG C, sulfuric acid mist in the flue gas is condensed and separated out, a large amount of sulfuric acid mist and other salt substances are removed, and system equipment blockage caused by substances such as acid mist and the like of subsequent equipment is prevented; according to the denitration system disclosed by the invention, the built-in combustors are uniformly arranged in the flue, the heating is uniform, the coal gas consumption is reduced, and the static mixer is arranged at the inlet of the denitration reactor, so that the uniformity of an ammonia-flue gas flow field is ensured, and the denitration efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of ultra-low emission for air pollution control, and in particular relates to an energy-saving and environment-friendly technology for flue gas control in iron and steel enterprises. Background technique [0002] With the rapid development of my country's economy, the output of steel continues to rise, so the pollution control of steel flue gas is becoming more and more severe, and the emission indicators are becoming more and more stringent. Sintering pellet flue gas is the most important part of the emission of environmental protection standards in iron and steel enterprises. ring. Since the Ministry of Ecology and Environment issued the "Steel Sintering and Pelletizing Industry Air Pollutant Emission Standards" in June 2017, the sintering and pelletizing flue gas of iron and steel enterprises in various places has faced the problem of environmental protection compliance, which has brought huge economic imp...

AI Technical Summary

Problems solved by technology

At present, most of the sintering pellet flue gas treatment technologies are the combination of the above-mentioned equipment, and these processes are relatively extensive combinations, with low removal efficiency and high failure rate, resulting in desulfurization and denitrification reagents, process water, Gas and electric energy produce a certain amount of waste. How to achieve low-carbon and high-efficiency flue gas ultra-low emission technology in the process of sintering pellet flue gas treatment is the starting point of the invention

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