Desulfurizing and purifying device for coke oven gas and application method thereof

Abstract

The invention relates to a field of chemical purification for removing the sulfur compounds with a know composition, and specifically relates to a desulfurizing and purifying device for coke oven gas and an application method thereof. The device comprises a desulfurizing tower (11) and a spraying nozzle (2), and is characterized by also comprising the following members: a regenerating tower (12), a dedusting tower (13), a cooling tower (14), a demisting tower (15), a drying tower (16), a converting tower (17), an absorbing tower (18), a discharging tower (19), a dehydrating tank (31), a pre-heating tank (32), a mother liquor storage tank (33), a heat exchanger (41), a incinerator (42), an exhaust heat boiler (43), a liquid pump (51), and an air pump (52). The application method comprises steps of catalytic desulfurization and burning. The provided device and application method thereof have a good desulfurization effect and are capable of reducing the equipment investment.

Description

technical field [0001] The invention relates to the field of chemical purification for removing sulfur compound components with known structures, in particular to a desulfurization and purification device for coke oven gas and its application method. Background technique [0002] Coke oven gas is usually used as a gaseous fuel or as a chemical raw material to produce methanol and other products. Coke oven gas contains H 2 Harmful impurities such as S and HCN need to be removed before use. If untreated coke oven gas is used directly, SO will be generated after combustion. 2 , SO 3 , NO X Air pollutants, such as air pollutants, are discharged into the atmosphere along with the flue gas, affecting air quality, and serious acid rain will form, affecting plant growth, endangering buildings, and detrimental to human health. The production and usage of coke ovens in iron and steel smelting are very large. With the increasing awareness of environmental protection and environmenta...

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Problems solved by technology

[0002] Coke oven gas is usually used as a gaseous fuel or as a chemical raw material to produce methanol and other products. Coke oven gas contains H 2 Harmful impurities such as S and HCN need to be removed before use. If untreated coke oven gas is used directly, SO will be generated after combustion. 2 , SO 3 , NO X Atmospheric pollutants such as flue gas are discharged into the atmosphere, affecting air quality, and serious acid rain will form, affecting plant growth, endangering buildings, and detrimental to human health.

The production and usage of coke ovens in iron and steel smelting are very large. With the increasing awareness of environmental protection and environmental protection requirements, the requirements for sulfur content in coke oven gas are becoming increasingly stringent. It is hoped that the coke oven gas can be removed as thoroughly as possible. The sulfur element in the gas can not only improve the quality of smelting, but also reduce environmental pollution, and can also use by-products to produce sulfuric acid, which is widely used in industry. Therefore, there are currently many desulfurization processes applied to coke oven gas, such as HPF method. This method uses ammonia in coke oven gas as an alkali source, and uses a quinone-cobalt-iron composite catalyst composed of hydroquinone, bicyclic phthalocyanine ammonium hexasulfonate and ferrous sulfate, etc., which also contains a small amount of cocatalyst. The advantages of low cost, good desulfurization effect and stable operation, but the waste liquid produced is highly corrosive and toxic, which is easy to generate new pollution sources, and the sulfur content in the by-products is not high, which limits the use of desulfurization process

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