Coal-fired flue gas semi-dry method combined desulfurization and denitrification system and method

Abstract

The invention provides a coal-fired flue gas semi-dry combined desulfurization and denitrification system and method. The coal-fired flue gas semi-dry combined desulfurization and denitrification system comprises a front oxidation system arranged on a flue, an absorption system arranged at an outlet of the flue, and a dust removal system and a chimney which are sequentially connected with the absorption system, wherein the front oxidation system comprises an H2O2 storage tank and an ultrasonic atomizer which are connected in sequence, and a compressed gas tank connected with an inlet of the ultrasonic atomizer; an outlet of the ultrasonic atomizer is connected into the flue; the absorption system comprises an absorption tower; the absorption tower adopts a circulating fluidized bed absorption tower, the top is provided with an absorbent supplementing bin, and the bottom is provided with a water-spraying humidifying device; the flue gas inlet of the absorption tower is connected with the flue outlet, the flue gas outlet of the absorption tower is sequentially connected with the dust removal system and the chimney, the system can effectively meet the requirement for integrated removal of pollutants, integrated removal of SO2 and NOx is achieved, meanwhile, the desulfurization and denitrification efficiency is high, the process is simple, and the investment and operation cost is low.

Description

technical field [0001] The invention relates to the field of flue gas purification for comprehensive treatment of waste gas in coal-fired power plants, sintering machines in steel plants, industrial boilers, biomass power plants, waste incineration plants, etc., specifically a coal-fired flue gas semi-dry combined desulfurization and denitrification system and method. Background technique [0002] More than 95% of large coal-fired units in my country have achieved ultra-low emissions, but the treatment process is single, the operating cost is high, and there is an urgent need for transformation. Integrated removal and resource utilization are the direction of future development. Compared with the pollutant treatment in the power industry, the non-electric industry has a wide distribution of pollutant emissions, small flue gas volume, complex flue gas working conditions, and difficult governance. Integrated removal and low-temperature denitrification technologies have urgent ...

AI Technical Summary

Problems solved by technology

But in H 2 o 2 In the NO oxidation process, compressed atomization is often used to spray NO into the flue to oxidize NO. The oxidation efficiency of this process is low, generally less than 60%.

At the same time, due to the limited efficiency of NO oxidation, the existing semi-dry desulfurization system x The absorption efficiency is low and cannot meet the NO x emissions demand

Images