Gas boiler smoke discharge device and process

Abstract

The invention discloses a gas boiler smoke discharge device and process. The process includes the following steps of spraying ammonium hydroxide for denitration, redoxing pollutants through low-temperature plasma reaction, spraying dry powder for deacidification, conducting dry-type electrostatic dust removal to remove dust particles and solid salt type particles in smoke, conducting cloth bag dust removal to obtain super-clean smoke, and discharging the super-clean smoke through a chimney. The synergistic, efficient and deep removal of various pollutants (NOX, SOX and dust) in gas boiler smoke of a steel plant can be realized, the discharge of the dust, NOX and SOX can be well controlled, and the super-low discharge of the gas boiler smoke of the steel plant is realized, wherein NOX is smaller than 50 mg / Nm3, SOX is smaller than 35 mg / Nm3, and dust is smaller than 5 mg / Nm3. Meanwhile, the integrated device with the combined optimization design of channel processing, ammonia spraying,plasma reacting, dry powder spraying, electrostatic dust removing and cloth bag dust removing has the advantages of being compact in structure, simple in system process, low in operation cost, small in occupied area and the like.

Description

technical field [0001] The invention relates to the field of air pollution purification, in particular to a gas boiler flue gas discharge device and process in steel mills. Background technique [0002] China is a big country in steel production in the world, with an annual output ranking first in the world, with an average daily steel output exceeding 2 million tons. In order to promote green manufacturing, all iron and steel enterprises attach great importance to the comprehensive utilization of the by-product gas produced in the production process, except that it consumes 50% to 60% in various sections of the metallurgical process, such as hot blast stoves, converters, heating furnaces, etc. , and the rest are converted into heat or electricity by boilers, so as to effectively reduce energy waste and environmental pollution caused by direct emission. The by-product gas produced in the production process of iron and steel enterprises mainly includes blast furnace gas, con...

AI Technical Summary

Problems solved by technology

However, with the gradual increase in the requirements of environmental protection emission standards, emission control has become more and more difficult, especially for dust, NO X and SO X At present, the commonly used emission devices in China are still not able to X and SO X good emission control

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