Coke oven carbonization chamber fume and dust treatment system based on gas separate recycling

Abstract

The invention discloses a coke oven carbonization chamber fume and dust treatment system based on gas separate recycling, and belongs to the technical field of coking industry energy conservation andenvironmental protection. The system comprises a machine side coke oven gas recycling system which is arranged on the machine side of a coke oven carbonization chamber and used for recycling raw gas generated by coking coal in the mid-term of coking and a coke side coaling fume and dust recycling system which is arranged on the coke side of the coke oven carbonizatin chamber and used for recyclingcoaling fume and dust generated in the coaling process and raw gas generated by the coking coal in the initial stage and terminal stage of coking, the coke side coaling fume and dust recycling systemcomprises a water-sealed valve, a coaling fume and dust combustion chamber connected with one end of the water-sealed valve and a coke side gas collecting tube used for conveying the fume and dust toa coke oven combustion chamber, the coaling fume and dust combustion chamber is further internally provided with an automatic igniter and a combustion emission opening kept to be communicated with the outside atmosphere. According to the system, waste heat recycling in the coaling process and the coking process can be achieved simultaneously, and the occurrence rate of accidents is reduced.

Description

technical field [0001] The invention relates to the recovery of coking oven coal dust and coking gas, and belongs to the technical field of energy conservation and environmental protection in the coking industry, and in particular relates to a coke oven carbonization chamber smoke control system based on gas quality recovery. Background technique [0002] In the top-charging coal chamber coking process commonly used at present, strong precipitation of gas due to the high temperature of the furnace wall of the carbonization chamber is observed almost immediately when the carbonization chamber is charged with coal. During the first two hours, more heat is expended by the furnace wall than is received from the heating flue—the temperature of the furnace wall drops, causing coal decomposition and gas evolution to slow down. Afterwards the furnace wall temperature equilibrates and the decomposition proceeds approximately at a constant rate. When the temperature is 450-500°C, aft...

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Problems solved by technology

[0008] 4. Gas ejected due to instantaneous blockage of the furnace top space

However, due to the constraints of investment and gas properties (inflammable and explosive, if two sets are used for backup, the unused set needs to be protected by inert gas for a long time, and the backup cost is too high), modern coking process design and engineering construction generally do not consider the construction of backup Therefore, in modern coking production, it is difficult to overcome the release of coke oven waste gas and the resulting pollution to the environment

At the same time, it is also determined that the existing coking waste gas recovery system cannot overcome the loss of waste gas and pollute the environment in the event of an accident, and the emergency measures for coke oven production are seriously insufficient;

[0019] (2) During the coking process of coking coal, the composition and properties of the raw gas generated during different coking periods are quite different. The existing coking raw gas recovery system cannot identify the nature of the raw gas, and cannot be used for different properties of the raw gas in different periods. Quality recovery

At the same time, the fine coal powder and moisture are relatively high. After the raw coal gas enters the recovery system at this time, all the dust and water vapor it carries are collected and entered into the subsequent gas purification system, which will cause blockage of subsequent related units and seriously affect subsequent related products. quality, increasing the cost of subsequent wastewater treatment;

[0020] (3) Limited by the coking production process, the carbonization chamber is required to be operated under positive pressure. The existing coking waste gas recovery system cannot prevent waste gas from overflowing and polluting places such as the furnace door of the coking chamber and the coal charging hole cover on the top of the furnace in the early stage of coking. environmental phenomenon

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