Coal-fired flue gas denitration and desulfurization method

Abstract

The invention discloses a coal-fired flue gas denitration and desulfurization method, performing treatment through a following desulfurization apparatus. The desulfurization apparatus comprises a desulfurization pipeline that includes a primary filter pipe, an adsorption filter pipe and a photocatalytic purifying pipe connected in sequence, the inner wall of the primary filter pipe is provided with a sodium hypochlorite solution atomizing nozzle, an oxygen nozzle and an ammonium persulfate solution atomizing nozzle sequentially from a flue gas inlet to a flue gas outlet, the sodium hypochlorite solution atomizing nozzle is mounted parallel to the inner wall of the primary filter pipe, the oxygen nozzle is mounted obliquely down and is 35-55 degrees angled to the inner wall of the primary filter pipe, the ammonium persulfate solution atomizing nozzle is mounted perpendicular to the inner wall of the primary filter pipe, and a plate provided with cellular holes is arranged in the adsorption filter pipe. The method enables denitration to be completed during desulfurization, removal rate of sulfur dioxide is up to above 99%, and removal rate of nitrogen oxides is up to above 90%.

Description

technical field [0001] The invention relates to the field of coal-fired flue gas treatment, in particular to a method for denitration and desulfurization of coal-fired flue gas. Background technique [0002] my country is rich in coal resources and is one of the main energy sources. However, with the use of coal, environmental problems have become prominent. The combustion of coal emits smoke, which contains a large amount of polluting gases such as SOx, SO2, and N2O. According to statistics, 90% of SOx, 71% of CO, 85% of CO2, 70% of NOx and 70% of soot in air pollutants come from the direct combustion of raw coal, so coal-fired flue gas is the main cause of air pollution in our country . In order to further improve the urban ambient air quality and strengthen the pollution control of coal-fired steam boilers, it is urgent to find a method for denitrification and desulfurization of coal-fired flue gas. [0003] Existing desulfurization operations can be divided into dry, s...

AI Technical Summary

Problems solved by technology

Although this is a desulfurization technology commonly used in countries all over the world, this operation method cannot ensure sufficient gas-liquid contact, and the gas-liquid contact time is short, and the desulfurization effect is poor

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