Composite desulfurization and denitration agent

Abstract

The invention provides a composite desulfurization and denitration agent, and belongs to the technical field of industrial gas purification. The composite desulfurization and denitration agent is characterized by being prepared through the following steps: mixing the following raw materials in parts by weight: 40 to 50 parts of urea, 60 to 80 parts of sodium carbonate, 0.2 to 0.8 part of EDTA-Fe, 0.2 to 0.8 part of absorption enhancer, and 0.5 to 0.8 part of distearoyl diethylenetriamine, wherein the total parts by weight of the EDTA-Fe, absorption enhancer, and surfactant are more than 1.2 parts by weight; adding 700 to 900 parts by weight of water into the mixture, evenly mixing, and adding a proper amount of sodium hydroxide to adjust the pH value to a range of 10 to 12. The composite desulfurization and denitration agent is used to remove high-valence oxynitride and sulfur dioxide at a normal temperature and under a normal pressure; the nitrogen dioxide absorption rate of the agent is 95% or more, the sulfur dioxide absorption rate of the agent is 90% or more, and the agent has the advantages of rapid absorption speed and high efficiency.

Description

technical field [0001] The invention relates to a compound desulfurization and denitrification agent, which belongs to the technical field of industrial gas purification. Background technique [0002] At present, the main denitrification processes are SNCR (selective non-catalytic reduction) and SCR (selective catalytic reduction) technologies. By adding ammonia or ammonia water to the flue gas and controlling the reaction conditions, the nitrogen oxides and ammonia undergo a redox reaction to generate nitrogen to achieve the purpose of denitrification. [0003] The shortcomings of the above-mentioned denitrification process are: selective non-catalytic reduction method: the efficiency of nitrogen oxide removal by spraying ammonia in the furnace is low (30%-50%), ammonia escape is serious, and it is difficult to standardize emissions; selective catalytic reduction method uses Catalyst, the efficiency is relatively high and can reach 80% efficiency, but the investment is hig...

AI Technical Summary

Problems solved by technology

[0003] The shortcomings of the above-mentioned denitrification process are: selective non-catalytic reduction method: the efficiency of nitrogen oxide removal by spraying ammonia in the furnace is low (30%-50%), ammonia escape is serious, and it is difficult to standardize emissions; selective catalytic reduction method uses Catalyst, the efficiency is relatively high and can reach 80% efficiency, but the investment is high, the catalyst layer needs to be replaced every 2-3 years, and the operating cost is high

At the same time, the ammonia gas that the system participates in the reaction needs to be obtained through methods such as liquid ammonia evaporation, ammonia water evaporation, and urea pyrolysis, which poses a great safety hazard

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