Dry-wet combined desulfurization and dust removal method for waste gas generated during brick making by blending sludge

Abstract

The invention provides a dry-wet combined desulfurization and dust removal method for waste gas generated during brick making by blending sludge, and relates to the technical field of environmental protection. Desulfurization and dust removal are carried out by adopting a dry-wet method combined desulfurization and dust removal system, and the method comprises the following steps: treating drying kiln waste gas, namely introducing the waste gas in a sludge blending combustion brick making drying step into the dry method desulfurization and dust removal system, carrying out semi-dry method desulfurization, and carrying out dust removal after desulfurization; treating sintering kiln waste gas: introducing the waste gas in the step of brick making and sintering by blending the sludge into a wet desulfurization and dust removal system, carrying out wet desulfurization, and carrying out dust removal after desulfurization; flue gas combined discharging: guiding the waste gas treated by the dry desulfurization and dust removal system and the waste gas treated by the wet desulfurization and dust removal system into a waste gas gathering system to be mixed, and discharging the waste gas after being detected to be qualified. Dividing treatment is carried out according to the property of the waste gas, equipment faults are reduced, the operation cost can be reduced, and the treated waste gas meets the emission standard.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a dry-wet combined desulfurization and dust removal method for brick-making waste gas mixed with burning sludge. Background technique [0002] In order to reduce pollutant discharge and improve the utilization rate of raw materials, the cement and brick and tile industries will use their own industrial furnaces such as tunnel kilns or wheel kilns to mix strictly controlled waste such as printing and dyeing sludge and municipal sludge into raw materials in a certain proportion making bricks. The production process of blending sludge to make bricks is mainly divided into three steps: drying, using a biomass rotary kiln to dry the sludge from a moisture content of 60% to 40%; making bricks, using an appropriate material ratio to mix the materials , use the brick making machine to press the mixed raw materials into adobe; sintering, send the pressed adobe to the tun...

AI Technical Summary

Problems solved by technology

[0003] Existing waste gas produced by blending sludge and making bricks is usually treated by wet desulfurization and dust removal methods. A large amount of organic waste gas generated during the drying process is directly discharged into the kiln flue gas treatment equipment, resulting in the failure of the wet desulfurization and dust removal system. COD and ammonia nitrogen in the circulating slurry are very high, resulting in secondary pollution and high follow-up treatment costs; after a period of time, the circulating tank will accumulate organic sediment, which needs to be cleaned, seriously affecting the system availability and continuous operating conditions. May cause the factory to be forced to shut down for cleaning

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