Coal-fired flue gas desulphurization denitration process and desulphurization denitration device thereof

Abstract

The invention discloses a coal-fired flue gas simultaneous desulphurization denitration process by low temperature plasma oxidation combined with ammonia-method wet absorption; the process comprises two processes of low temperature plasma oxidation and ammonia-method wet absorption; coal-fired flue gas to be treated is firstly introduced into a low temperature plasma reactor through a flue, and thus 40%-50% of NO in the flue gas is oxidized into NO2; the conditioned flue gas is introduced into a simultaneous desulphurization denitration spray tower, and fully contacts ammonia water absorption liquid so as to remove SO2 and NOx in the flue gas and discharge the flue gas; the absorption liquid at the bottom of the simultaneous desulphurization denitration spray tower is delivered into a spray layer again for recycle through an absorption liquid circulating pump; ammonia water in an ammonia water groove is supplied continuously to the spray tower through an ammonia water pump; and a part of mother liquor is discharged through a mother liquor transfer pump. The process of the invention is applicable to the simultaneous desulphurization denitration treatment of coal-fired flue gas, and the device of the invention has the advantages of good pollutant removing effect, simple equipment, less land occupation, convenient operation, and convenience for management.

Description

Technical field [0001] The invention relates to a coal-fired flue gas desulfurization and denitrification process and a desulfurization and denitrification device, in particular to a process and a device for simultaneous desulfurization and denitrification of coal-fired flue gas using low-temperature plasma oxidation combined with ammonia wet absorption, belonging to The technical field of comprehensive purification of pollutants in environmental protection. Background technique [0002] As my country's main primary energy, coal accounts for about 64% of primary energy consumption. Power plants, as a large coal-burning company, consume about 47% of my country's coal production. Many pollutants are produced in the process of burning coal, of which sulfur dioxide (SO 2 ) And nitrogen oxides (NO x ). With the rapid economic development, the coal-based energy structure has greatly increased my country’s coal-fired flue gas emissions, and SO 2 And NO x The pollution is getting more a...

AI Technical Summary

Problems solved by technology

At the same time, the ammonia-based wet denitrification has progressed slowly and has few industrial applications. The reason is that 90% to 95% of NO in coal-fired flue gas x However, the reactivity of NO and the solubility in water are low, which makes the removal rate of ammonia wet denitrification low and consumes a lot of energy. It is difficult to realize the promotion and application of this technology.

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