Process for preventing fogging and explosion of coal dried tail gas in dry bag-type dust removal process

Abstract

The invention relates to a process for preventing fogging and explosion of coal dried tail gas in dry bag-type dust removal process. The process comprises the following steps of: sucking high-dew-point and low-oxygen-content dust-containing dried tail gas which is exhausted from the tail of a drier into a bag-type dust remover by a draught fan for gas-solid separation; discharging separated dust which is deposited at the bottom of the bag-type dust remover by a star discharger; drawing purified carrier gas and water vapour to a safety place by the draught fan for exhausting; drawing a part ofthe tail gas from an outlet pipeline of the bag-type dust remover by a circulating fan; mixing a part of air which is heated by an air heater; and heating the air by using a circulating heater, and mixing into an outlet tail gas pipeline of the drier. The aim of preventing the fogging of the tail gas in the dried tail gas treatment process is fulfilled by cyclically heating the part of the tail gas and mixing a certain amount of hot air, the aim of preventing the explosion is fulfilled by controlling the content of oxygen in an outlet of the bag-type dust remover, and the fogging of the driedtail gas in the bag-type dust remover is prevented during explosion prevention.

Description

technical field [0001] The patent of the invention relates to the technical field of coal drying tail gas treatment, and belongs to an anti-condensation and anti-explosion process of coal drying tail gas in the process of dry bag dust removal. This process is suitable for the treatment of tail gas produced in the drying process of the heat conduction dryer with indirect heating of coal drying countercurrent or downstream. It is also suitable for lignite, and it can also be used for indirect heating of long-bituminous coal, coking coal and other flammable and explosive materials. Treatment of tail gas generated during the drying process of the heat conduction dryer. Background technique [0002] Coal occupies an irreplaceable position in my country's energy consumption. The efficient utilization of lignite has been highly valued by the energy sector. Therefore, reducing moisture and increasing energy density have become one of the key issues in lignite processing and utiliz...

AI Technical Summary

Problems solved by technology

Therefore, when air is used as the carrier gas in coal drying, the amount of air entering is strictly controlled to prevent coal powder from burning and exploding. This results in a high dew point of the exhaust gas of the dryer, which is easy to condense in the exhaust gas treatment part, affecting continuous operation.

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