Deep desulfurization method for shaft furnace flue gas

Abstract

The deep desulfurization method comprises the following steps: preparation of desulfurization slurry: adding desulfurization additive powder into a desulfurization slurry storage tank containing water, and uniformly stirring to obtain a mixture; the desulfurization additive is prepared from the following components in parts by weight: 50 parts of sodium carbonate, 35 parts of magnesite, 10 parts of magnesium sulfate and 5 parts of oxalic acid, grinding limestone into powder, adding the powder into the mixture, and fully stirring to obtain desulfurization slurry for later use; sulfur-containing flue gas generated by the shaft furnace sequentially enters the cyclone dust collector and the bag collector; desulfurization slurry is introduced into a desulfurization tower through a circulating pump machine, then gas discharged from a bag-type dust collector enters the desulfurization tower through a booster fan, flue gas flows upwards in the desulfurization tower and is washed by the desulfurization slurry flowing downwards in a countercurrent mode, acid gas components are removed through washing, and the flue gas is discharged from the bag-type dust collector. And the purified flue gas flows through a three-stage demister to be demisted, and the gas reaching the standard is discharged through a chimney. The method can improve the desulfurization efficiency and has a remarkable desulfurization effect.

Description

technical field [0001] The invention belongs to the technical field of waste gas treatment, and in particular relates to a deep desulfurization method for flue gas of a shaft furnace. Background technique [0002] In the process of smelting high-carbon ferrochromium in submerged arc furnaces, the raw materials are mainly South African mines and Turkish mines, and coke, a reducing agent, is also used. Because minerals and coke contain a certain amount of sulfur, for example, the sulfur content in the South African mine reaches 0.5wt%, the sulfur content in the Turkish mine reaches 0.01wt%, the sulfur content in the coke reaches 0.7wt%, and the sulfur content in the ferrochromium reaches 0.7wt%. The amount reaches 0.04wt%, resulting in the production of a large amount of flue gas containing sulfur dioxide during the smelting process of the submerged arc furnace. Since a large amount of CO gas will be generated during the smelting process of the submerged arc furnace, it can b...

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Problems solved by technology

[0003] During the production process of shaft furnace pellets, the temperature of the supplied flue gas is 80-140°C, up to 240°C. The flue gas produced by producing 1t of pellets contains 10-30kg of dust and some corrosive gases, such as SO x , NO x Such acidic gaseous pollutants, they will form dilute acid when they meet water, causing air pollution and continuous corrosion of metal parts

[0004] At present, most of the industrial desulfurization processes are limestone-gypsum wet desulfurization process, which has low desulfurization efficiency and unsatisfactory desulfurization effect

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