Flue gas low-temperature efficient desulfurization and denitrification device and method

Abstract

The invention discloses a flue gas low-temperature efficient desulfurization and denitrification device and method. The flue gas low-temperature efficient desulfurization and denitrification device comprises a flue gas exhaust pipe, a desulfurization system, a mixer, an ammonia production system, a denitrification system, a recovery system and an ammonia production tank; firstly, a fluidized desulfurizing agent is sprayed out through nanopores in a powder spraying pipeline by utilizing a compressed air assembly, is fully mixed and filtered with flue gas introduced by the flue gas exhaust pipein a mixing filter, then is introduced into a mixer, and is fully mixed with heated and dried ammonia gas; the mixed gas passes through an active coke layer to adsorb sulfur dioxide gas, and desulfurization treatment is carried out; and secondly, the mixed gas penetrates through a plurality of catalyst layers to be subjected to denitrification reaction, impurities obtained by filtering the flue gas and the active coke layer are recycled by utilizing a recycling system, and meanwhile, the gas subjected to denitrification reaction is discharged into the atmosphere through the ammonia productiontank, so that efficient desulfurization and denitrification can be realized, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of flue gas harmless treatment, in particular to a device and method for low-temperature and high-efficiency desulfurization and denitrification of flue gas. Background technique [0002] The treatment process of nitrogen oxides in the electric power, cement, glass and other industries is quite mature, but the temperature of the coke oven flue gas discharged from the coking plant is relatively low, and the NO X , SO 2 The content is relatively high. If the traditional denitrification process is adopted, it must be affected by the low flue gas temperature, SO 2 Restricted by factors such as high content, it cannot meet the NO requirements of the coking industry X Emission standard requirements. However, in order to reduce SO in the current technical means 2 For the impact on the denitrification efficiency of low-temperature flue gas, the traditional desulfurization process is pre-installed in the denitrif...

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Problems solved by technology

[0002] The treatment process of nitrogen oxides in the electric power, cement, glass and other industries is quite mature, but the temperature of the coke oven flue gas discharged from the coking plant is relatively low, and the NO X , SO 2 The content is relatively high. If the traditional denitrification process is adopted, it must be affected by the low flue gas temperature, SO 2 Restricted by factors such as high content, it cannot meet the NO requirements of the coking industry X Emission Standard Requirements

However, in order to reduce SO in the current technical means 2 The impact on the denitrification efficiency of low-temperature flue gas, the traditional desulfurization process is pre-installed in the denitrification process, and ammonia gas needs to be provided separately, which reduces the desulfurization and denitrification efficiency and increases the cost

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