Coke oven flue gas comprehensive purification system utilizing SDS dry desulfurization

Abstract

The invention provides a coke oven flue gas comprehensive purification system utilizing SDS dry desulfurization, which comprises an original flue, an SDS dry desulfurization module, a transition flue, a ceramic catalytic filter bag module, a clean flue and a chimney sequentially arranged along the flowing direction of coke oven flue gas, wherein the SDS dry desulfurization module comprises a desulfurizer spraying device, a Venturi section and a desulfurization reactor. Coke oven flue gas enters through an original flue and is in contact with thedesulfurizer sprayed by a desulfurizer spraying device, an outlet flue of the desulfurizer spraying device is connected with a desulfurization reactor through a Venturi section, and the coke oven flue gas and the desulfurizer jointly enter the Venturi section and the desulfurization reactor to be fully mixed and reacted. An outlet of the desulfurization reactor is connected with the ceramic catalytic filter bag module through a transition flue for denitration and dust removal, and an outlet of the ceramic catalytic filter bag module is connected with a chimney through a clean flue. The system 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 SDS 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. [0003] 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 technolo...

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Problems solved by technology

[0005] 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

[0006] 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

[0007] 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

[0008] 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

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