Circulating fluidized bed semi-dry desulfurized fly ash circulating system and control method

Abstract

The invention discloses a circulating fluidized bed semi-dry desulfurized fly ash circulating system which comprises a plurality of dust remover units connected with a flue gas outlet of a desulfurizing tower and used for capturing desulfurized fly ash carried by flue gas entering the dust remover units, a desulfurized fly ash conveying unit used for converging the desulfurized fly ash received from each dust remover unit and partially conveying the desulfurized fly ash back to the desulfurization tower, and an external ash discharging unit communicated with the desulfurized ash conveying unitand used for discharging part of desulfurized ash in the desulfurized ash conveying unit out of the system. According to the desulfurized fly ash circulating system, the desulfurized fly ash discharged from a plurality of ash buckets is gathered, and the gathered desulfurized fly ash is circulated and discharged, so that the system configuration is optimized, the number of control valves and binpumps arranged at the outlets of the plurality of ash buckets is greatly reduced, and the manufacturing cost of the system is effectively reduced. By simplifying the system composition, system controlpoints are reduced, the technological process is simplified, meanwhile, the equipment maintenance amount is reduced, and the manpower and material resource cost is saved.

Description

technical field [0001] The invention relates to the field of environmental protection treatment of flue gas pollutants, in particular to a circulating fluidized bed semi-dry desulfurization ash circulation system and a control method. Background technique [0002] The circulating fluidized bed semi-dry desulfurization process is one of the main flue gas desulfurization and dust removal processes at present, and it is the main way to achieve "ultra-low emission" of flue gas. The main equipment of this process is a circulating fluidized bed desulfurization tower and a dust collector. The working principle is that the flue gas flows through the venturi tube of the circulating fluidized bed desulfurization tower, and the desulfurization agent and the desulfurization ash of the external circulation are fluidized and sent to the desulfurization tower. Desulfurization semi-dry washing reaction. The flue gas first enters the desulfurization tower and undergoes desulfurization react...

AI Technical Summary

Problems solved by technology

In order to meet the material balance of desulfurization ash circulation and discharge in the system, it is necessary to install a large number of control valves and warehouse pumps on the two branches of circulation and discharge, resulting in complex process flow, many required equipment and control points, and the system High cost, high maintenance, etc.

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