Coke oven flue gas comprehensive purification system utilizing SDA semi-dry desulfurization

Abstract

The invention provides a coke oven flue gas comprehensive purification system utilizing SDA semi-dry desulfurization, which comprises an original flue, an SDA semi-dry desulfurization module, a transition flue, a ceramic catalysis filter bag module, a clean flue and a chimney sequentially arranged along the flowing direction of coke oven flue gas, wherein the SDA semi-dry desulfurization module comprises a slurry atomization system and an SDA desulfurization tower; coke oven flue gas enters from a slurry atomization system through an original flue and is fully mixed and reacted with desulfurization agent slurry sprayed by the slurry atomization system, the slurry atomization system is arranged at the top of an SDA desulfurization tower, and the coke oven flue gas desulfurized by the SDA desulfurization tower is introduced into a ceramic catalytic filter bag module for denitration and dust removal. The ceramic catalytic filter bag module is connected with a chimney through a clean flue, and flue gas subjected to desulfurization, denitration and dust removal sequentially passes through the clean flue and the chimney and is discharged into the atmosphere. The system is rapid and sufficient in reaction, has relatively high desulfurization, denitrification and dust removal efficiency, can synergistically remove pollutants such as heavy metals and dioxin, and is low in ammonia escape rate.

Description

【Technical field】 [0001] The invention relates to the technical field of flue gas purification, in particular to a coke oven flue gas comprehensive purification system utilizing SDA semi-dry desulfurization. 【Background technique】 [0002] Coke oven flue gas is the exhaust gas produced by heating and burning fuel coke ovens. The composition of the flue gas varies with the type of coke oven, production process, and fuel type. SO 2 and NOx concentration range is wide, respectively up to 50-600mg / m 3 and 400-1200mg / m 3 , The flue gas temperature is relatively low, generally at 190-280°C. Due to the influence of coke oven flue gas characteristics, the application of various desulfurization and denitrification processes is restricted to varying degrees. At present, SCR denitrification + dust removal + ammonia desulfurization, SCR denitrification + dust removal + calcium-based SDA semi-dry are mainly used in actual projects at home and abroad. Flue gas purification technologies...

AI Technical Summary

Problems solved by technology

[0004] 1. When coke oven flue gas is purified by SCR denitration + dust removal + ammonia desulfurization process, ammonia desulfurization will easily cause acid corrosion in the chimney, high equipment maintenance costs, and ammonium bisulfate produced by pre-denitration will affect catalyst stability. sex

[0005] 2. When using SCR denitrification + dust removal + calcium-based SDA semi-dry desulfurization process, the ammonium bisulfate produced by pre-denitration will affect the stability of the catalyst, occupying a large area and high energy consumption

[0006] 3. When using calcium-based SDA semi-dry desulfurization + dust removal + medium and low temperature SCR denitrification process, it occupies a large area and consumes a lot of energy

[0007] 4. When using activated carbon dry desulfurization and denitrification process, the material is easy to burn, the temperature drop of the flue gas is large, and the one-time investment and operating costs are high

Images