Quicklime circulating fluidized bed grading dry digestion system

Abstract

The invention discloses a quicklime circulating fluidized bed grading dry digestion system, and relates to the technical field of quicklime dry digestion systems. The system comprises a digestion tower, wherein the digestion tower comprises a venturi; a digestion tower is communicated, at the upper part of the venturi, with a feeding system and is communicated, at the lower part of the venture, with a desulfurizing tower; a fluidized bed area is formed above the venturi; the digestion tower is provided, above a fluidized bed area, with a water feeding device; the digestion tower is communicated, above the water feeding device, with a separation device; the separation device comprises a primary cyclone separator and a secondary cyclone separator; an inlet of the primary cyclone separator iscommunicated with the digestion tower; a lower outlet of the primary cyclone separator is communicated with the fluidized bed area; an upper outlet of the primary cyclone separator is communicated with an inlet of the secondary cyclone separator; the secondary cyclone separator comprises a hydrated lime outlet and a smoke outlet. According to the quicklime circulating fluidized bed grading dry digestion system disclosed by the invention, the digestibility of the quicklime can be improved, a requirement on quality of inlet quicklime is reduced, and smoke can be reused, so that energy is conserved and an influence on an environment is reduced.

Description

technical field [0001] The invention relates to the technical field of dry digestion systems, in particular to a graded dry digestion system for quicklime circulating fluidized beds. Background technique [0002] As my country controls and reduces SO 2 With the continuous increase of emissions, flue gas desulfurization has entered a stage of rapid development, while the existing dry desulfurization and semi-dry desulfurization in the production of lime is mostly produced by mechanical agitation. The traditional mechanical agitation for quicklime digestion is in Water is added to the mixer to mix and digest quicklime powder and water to produce slaked lime. In the process of making slaked lime, the quicklime is not fully digested, and the obtained slaked lime cannot meet the requirement of uniform fluffy dry powder. Contents of the invention [0003] The technical problem to be solved by the present invention is that quicklime is not digested sufficiently in the process of...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the digestion of quicklime is insufficient in the process of preparing slaked lime in the current dry digester, and the quality requirements for the imported quicklime are relatively high, and the slaked lime cannot meet the requirements of a uniform fluffy dry powder

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