Device for treating flue gas produced during waste incineration for power generation

Abstract

The invention discloses a device for treating flue gas produced during waste incineration for power generation. Flue gas generated by waste incineration for power generation sequentially passes through a flue gas semi-dry treatment device, a dry treatment device and a bag-type dust collector for treatment. A purging device is arranged on a lime bin of a slurry preparation device in the semi-dry treatment device, a plurality of lime slurry preparation tanks are arranged, a plurality of spiral constant feeders are correspondingly arranged and connected with a discharge port of the lime bin and feed ports in the tops of the lime slurry preparation tanks respectively, and a plurality of overhaul windows are formed in the lower portion of the lime bin. Due to the fact that the pipe diameters ofthe first equal-diameter circular pipe sections of the dry treatment device are consistent, flue gas flows stably, and pressure stabilizing effect is achieved; after the flue gas enters a reducing pipe expanding section, due to the fact that the pipe diameters are gradually increased, the effect of reducing a flow speed is achieved; and an oval pipe section is arranged on the reducing pipe expanding section, so flue gas treatment effect is better, and flue gas treatment efficiency is higher. Fly ash collected by the bag-type dust collector falls into an ash discharging device, and the structure can prevent the fly ash from being accumulated and fixed on a valve plate.

Description

technical field [0001] The invention relates to a waste incineration power generation flue gas treatment device, which belongs to the field of waste incineration flue gas treatment equipment. Background technique [0002] The flue gas produced in the waste incineration power generation process needs to be treated because it contains a variety of toxic and harmful substances. In the semi-dry treatment stage, lime slurry spray is used for flue gas treatment. During the preparation process of lime slurry, single-channel structure is easy to block, resulting in poor powder delivery, resulting in stoppage of pulping work and affecting flue gas treatment operations. And it is easy to attach lime powder on the lime silo inner wall that holds lime powder, causing the lime silo wall to agglomerate. The structural cross-sectional area of ​​the device in the dry treatment stage is basically unchanged, resulting in little change in the flue gas flow rate, which is not conducive to the ...

AI Technical Summary

Problems solved by technology

However, since the fly ash falls on the valve plate in an irregular manner, it may fall near the rotating shaft of the valve plate, resulting in a short arm of force at the position where the fly ash accumulates, and there is not enough weight to press down on the valve plate for ash discharge, which may cause Cause fly ash to accumulate on the valve plate and be difficult to remove

Some electric flap ash unloading valves open the valve plate at a fixed frequency for ash discharge, but frequent opening of the valve plate causes heat loss in the flue, but if the frequency is reduced, it may cause fly ash to accumulate

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