Submerged arc furnace gas recycling method and equipment

Abstract

The invention relates to a submerged arc furnace gas recycling method and equipment. The submerged arc furnace gas recycling method provided by the invention comprises the following steps: controllingoxygen content of submerged arc furnace gas to be less than 2% and controlling the temperature to be not higher than 400 DEG C, and removing dust by a gravitational dust collector, and cooling to a temperature of 200-280 DEG C; and cooling the submerged arc furnace gas subjected to gravitational dust collection, pressurizing to 6-10kPa by a raw coke oven gas fan, and entering a bag-type dust collector to remove dust so as to obtain clean gas. According to the submerged arc furnace gas recycling equipment, a raw coke oven gas inlet pipe is sequentially connected with a primary gravitational settler, a secondary gravitational settler, a third-stage gravitational settler, a crude gas fan, a bag-type dust collector and a clean gas exhaust pipe. The submerged arc furnace gas recycling method provided by the invention is simple and easy to operate, the submerged arc furnace gas can be safely and effectively purified and recovered by reasonably controlling process parameters, and the equipment is long in service life and can continuously work. The conditions of oil dirt or dust blockage and the like can be avoided, and the submerged arc furnace gas recycling equipment can continuously work and is excellent in stability.

Description

technical field [0001] The invention relates to the field of tail gas recovery and utilization, in particular to a method and equipment for recovery and utilization of submerged arc furnace gas. Background technique [0002] Submerged arc furnace, also known as electric arc furnace or resistance electric furnace, is mainly used for reducing and smelting ore, carbonaceous reducing agent and solvent and other raw materials. It mainly produces ferrosilicon, ferromanganese, ferrochromium, ferrotungsten, silicon-manganese alloy and other ferroalloys, which are important industrial raw materials in the metallurgical industry and chemical raw materials such as calcium carbide. [0003] The gas formed after the reduction and smelting of ore in the submerged arc furnace contains a lot of dust and pollutants, but it contains a large amount of usable gas, which is called submerged arc furnace gas, also known as raw coal gas, but the gas is usually only used for steam Boiler feed water...

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Problems solved by technology

[0003] The gas formed after the reduction and smelting of ore in the submerged arc furnace contains a lot of dust and pollutants, but it contains a large amount of usable gas, which is called submerged arc furnace gas, also known as raw coal gas, but the gas is usually only used for steam Boiler feed water is heated, and the gas pipeline is easily blocked by pollutants, so the gas pipeline system needs to be cleaned and replaced frequently. At the same time, the exhaust gas after combustion of the gas also contains a lot of pollutants, which cannot be discharged directly, otherwise it will cause great environmental damage. Pollution

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