Desulfurization and low-temperature denitration system and process for clean flue gas emission

Abstract

The invention discloses a desulfurization and low-temperature denitration system for clean flue gas emission. The desulfurization and low-temperature denitration system comprises a desulfurization system, a denitration system, a flue gas washing system and a flue gas emission system, wherein the desulfurization system is composed of a desulfurizing absorption tower, a desulfurizing solution preparation system and a desulfurizing solution circulating system; the denitration system is composed of a denitrating absorption tower, an ozone generator and a denitrating solution circulating system; the flue gas washing system comprises a scrubbing tower and a scrubbing water supply system; the flue gas emission system is a chimney; and flue gas from a boiler is sequentially subjected to desulfurization, low-temperature denitration and flue gas scrubbing. The desulfurization and low-temperature denitration system disclosed by the invention has excellent desulfurization, denitration and dust removal effects and can eliminate a 'white smoke' problem caused by the flue gas. Moreover, the system disclosed by the invention solves the problem of secondary pollution in the desulfurization and denitration process and offers help for reducing and eliminating haze.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization and denitrification, in particular to a desulfurization and low-temperature denitrification system and process for clean emission of flue gas. Background technique [0002] In recent years, with the development of economy and industry, more and more serious air pollution has seriously troubled people's lives. For this reason, the state has become more and more stringent in monitoring the discharge of industrial emissions, and the discharge standards have become more and more stringent. According to the relevant regulations on environmental protection, the emission concentration of SO2 should be lower than 100mg / m3, the emission concentration of dust particles should be lower than 30mg / m3, the emission concentration of nitrogen oxides should be lower than 100mg / m3, and the discharge of pollutants into the atmosphere must meet the standards. This requires a high degree of purificat...

AI Technical Summary

Problems solved by technology

CN103406010B discloses a desulfurization, denitrification and dust removal device. This technology is a spray scattering tower. The desulfurization and dust removal effects can be significantly improved through this device, but the disadvantage of this technology is that the smoke resistance is increased and the energy consumption is relatively high.

CN205570079U discloses an integrated ultra-low emission system for desulfurization, denitrification, mercury removal and fine dust removal. CN105771573A discloses a system and method for synchronous desulfurization, denitrification and dust removal of gas boiler flue gas at low temperature. The above two technologies can effectively desulfurize, denitrify and Dust removal, but there is still room for improvement in terms of effect. In addition, the above-mentioned technologies are insufficient in eliminating "white smoke" and preventing secondary pollution.

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