Semi-dry process desulfurization dust-removing technique and device

Abstract

The invention relates to a semi-dry process desulfurization dust-removing technique and a semi-dry process desulfurization dust-removing device. The device comprises a desulfurization tower, a primary cyclone dust remover, a secondary pulse bag-type dust remover, a fan and a chimney which are arranged in sequence, wherein the chimney is connected with an air outlet of the fan; a scraper machine is used for conveying a desulfurization agent into a circulating ash bin; the circulating ash bin and a new ash bin are used for conveying the desulfurization agent into the desulfurization tower through the same pneumatic ash conveying device; a smoke flow rectifier comprises an upper cone-shaped cover plate and a lower inversely cone-shaped cover plate which are arranged up and down and connected to be a whole body; the smoke diffuses from the center to two sides to form a bottom-top flat flow layer. According to the semi-dry process desulfurization dust-removing technique and the device, a movement manner with combination of airflow inverse gravity field flow and solid-phase following gravity field is adopted, so that the problem that the tower is sticky at the offside of an air inlet due to a dense-phase dry tower process air inlet manner is solved; the minimum flow speed limit of airflow due to a circulating fluidized bed method is avoided; the circulating quantity of the desulfurization agent can be reduced; the working pressure of the subsequent scraper machine, a bucket elevator and the dust remover can be reduced; the service life of the device can be prolonged; the operation cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of environmental protection equipment, in particular to a semi-dry desulfurization and dust removal process and equipment. Background technique [0002] In the known technical field, the existing semi-dry flue gas desulfurization technologies generally include circulating fluidized bed system and dense phase dry tower method. [0003] Among them, the dense phase dry tower method uses the scraper machine and the bucket elevator to directly circulate the desulfurizer back to the desulfurization tower. This method will have design defects that cannot be produced normally because the circulating desulfurization dose exceeds the load capacity of the scraper machine. [0004] Secondly, the flue gas and desulfurizer in the circulating fluidized bed system move from bottom to top at the same time, which can control the optimal desulfurization conditions in the tower, and the utilization efficiency of desulfurizer is...

AI Technical Summary

Problems solved by technology

However, the reaction time between the flue gas and the desulfurizer in the tower is short, the contact is insufficient, and the desulfurization efficiency is low. A large amount of desulfurizer is required to continuously circulate ineffectively in the system. Large, bucket elevator, scraper machine operating load is large, frequent maintenance and replacement

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