Two-stage circulating fluidized bed desulfurization system and desulfurization process thereof

Abstract

The invention belongs to the field of flue gas treatment. The problem that the arrangement elevation of a desulfurization system is increased, a support structure is large and complex, and the operation resistance of the desulfurizing tower is large can be solved. According to the two-stage circulating fluidized bed desulfurization system and the desulfurization process provided by the invention,the advantage of high concentration of materials in an ascending tower and the advantage of high contact probability of fresh materials and sulfur dioxide in a descending tower are utilized, so that the height of the tower is reduced and the overall utilization rate of a desulfurizing agent is increased under the condition of ensuring the same residence time of flue gas. The desulfurization systemcomprises a desulfurization tower and a desulfurizing agent bin, wherein the desulfurizing tower comprises the ascending tower and the descending tower, and the top of the ascending tower is communicated with the top of the descending tower; the desulfurizing agent bin is respectively communicated with a venturi section connected with the bottom of the ascending tower and the top of the descending tower and is used for respectively adding a desulfurizing agent into the desulfurizing tower from the venturi section of the ascending tower and the top of the descending tower.

Description

technical field [0001] The invention belongs to the field of flue gas treatment, and in particular relates to a two-stage circulating fluidized bed desulfurization system and a desulfurization process. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] 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. Desulfu...

AI Technical Summary

Problems solved by technology

The advantage of the ascending tower is that when the desulfurization ash in the tower flows upward with the flue gas, it will fall back into the tower from the top part of the tower due to gravity, forming an internal circulation of the desulfurization ash and increasing the ash concentration in the tower; The disadvantage of the structure is that the reaction section of the tower body is relatively high, usually up to 30 meters, which causes the layout elevation of the whole system to rise, the support structure is large and complex, and the operation resistance of the desulfurization tower is large

Images