Low-temperature denitration solution and method

Abstract

The invention relates to a low-temperature denitration solution and method. The low-temperature denitration solution is prepared from 1.3%-2.0% by weight of sulfate, 8%-10% by weight of fusel oil ester and 98% by weight of tetramethylthiuram, and pH of the solution is 5-7. The atomized low-temperature denitration solution is mixed with a nitrogen-containing gas for denitration at the temperature of 200 DEG C or lower. Compared with the prior art, the low-temperature denitration solution and method have the advantages that denitration can be realized at low temperature, and the problems of large occupation area, long equipment flow, complicated process, mutual restriction and higher capital expenditure and operation cost of an SCR process and a Wet-FGD and SCR combined process are solved.

Description

technical field [0001] The invention relates to a denitration process, in particular to a low-temperature denitration solution and a denitration method. Background technique [0002] The nitrogen oxides in the tail gas emissions after the combustion of fossil raw materials undergo photosynthesis in the atmosphere to form the main source of PM2.5, which is the primary pollutant formed by nitrogen oxides. Environmental protection is becoming more and more important and urgent. The nitrogen oxides emitted by industrial kilns after combustion account for 70% of the total emissions. Reducing nitrogen oxides emissions is an important means to improve the environment. [0003] The currently widely used denitrification methods are solid (SCR) ammonia selective catalytic reduction method and high-temperature SNCR furnace ammonia injection method, which require high equipment investment and secondary pollution caused by ammonia escape. Long-term operation cannot meet the ultra-clean ...

AI Technical Summary

Problems solved by technology

Strict requirements on flue gas temperature have restricted the application of SCR technology in other industries, especially the flue gas denitrification of heavy polluting iron and steel sintering pellets and various industrial kilns. Due to the low flue gas temperature, generally only 120~200°C The SCR process needs to heat the flue gas to above 280°C, increasing energy consumption and operating costs

At present, all countries are studying low-temperature denitrification catalysts, but little progress has been made, and there is no industrial application of low-temperature catalysts.

[0005] At present, the new national ultra-clean emission standard has begun to be implemented, but due to technical limitations, denitrification in some industries has not been enforced, and only the location of denitrification devices has been reserved

Judging from the current technical level and the installed desulfurization and denitrification facilities, for a long period of time in the future, the typical Wet-FGD+SCR combination technology will still be the main denitrification and denitrification technology in my country, and there is a problem that the process occupies a large area. Long equipment flow and complex process, mutual constraints, high infrastructure costs and high operating costs

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