Method for purifying and recycling coaling smoke dust of coke oven

Abstract

The invention belongs to the technical field of energy conservation and environmental protection of the coking industry, and specifically discloses a method for purifying and recycling coaling smoke dust of a coke oven. According to the method, the coaling smoke dust generated during coaling of the coke oven is sucked by a coke-side heat-resisting blower, cooled by a water-sealed valve and then allowed to enter a coaling dust combustion chamber to have mixed oxygen burned out, then a coaling dust collecting head tube is introduced into a combustion chamber of the coke oven to supply supplementary fuel for coke oven heating, and accordingly coaling dust is recycled, dust capacity of a crude gas system of the coke oven is decreased, and quality of tar is improved. Additionally, the method for purifying and recycling the coaling smoke dust of the coke oven has the advantages that crude gas diffusion under emergency conditions is eliminated substantially, quality of crude gas under diffusing conditions is improved, and atmosphere quality around the coke oven is improved.

Description

technical field [0001] The invention relates to the purification and recycling of coke oven coal dust, belongs to the technical field of energy saving and environmental protection in the coking industry, and in particular relates to a method for purifying and recycling coke oven coal dust. Background technique [0002] The coal charging process in the coking process will generate a lot of smoke and dust, which mainly comes from the following aspects: [0003] 1) The coal material loaded into the carbonization chamber converts a large amount of air. When the furnace is loaded, the oxygen in the air and the fine coal particles in the furnace are burned to form carbon black and black smoke; [0004] 2) Furnace coal contacts with high-temperature furnace wall and heats up, producing a large amount of water vapor and raw gas; [0005] 3) The fine coal powder raised together with the above-mentioned water vapor and raw coal gas, and the fine coal powder brought out during the coa...

AI Technical Summary

Problems solved by technology

[0025] (1) The flue gas discharged from the existing coal charging and dedusting ground station contains a large amount of combustible components with high calorific value (fine coal dust, carbon monoxide, methane, hydrogen and other volatile organic compounds, etc.), which wastes energy and causes environmental pollution;

[0026] (2) Although the existing coal charging and dust removal ground station has purified the coal charging dust, the purification effect is not obvious, and pollution sources will still be generated. In addition, in order to prevent the tar in the dust from sticking to the cloth bag, it is necessary to use lime to clean the cloth bag. Pre-spraying will lead to restrictions on the reuse of collected dust, especially for independent coking enterprises, the dust has no resource utilization in the coking process;

[0027] (3) Although the dust removal effect of the PROVEN coal charging dust removal system is good and the floor area is small, it causes large pressure fluctuations in the gas collecting pipe. During the coal charging process, the suction of the gas collecting pipe is in an unstable state, causing smoke from other furnace doors;

[0028] (4) The connected pipe type will cause air to be sucked in, increasing the NO content in the raw gas;

[0029] (5) The injection method of the rising pipe will cause the dust particles in the raw gas to be suspended in the tar ammonia water, making it difficult to separate the tar, and the tar mixed with coal dust will deposit in the tar ammonia water clarification tank and easily block the pipeline

Images