New low-cost oxidation denitrating technology

Abstract

The invention provides a new low-cost oxidation denitrating technology aiming at the problem that the denitrating technology in the prior art is high in cost. The new low-cost oxidation denitrating technology comprises the specific steps as follows: A) preparing aqueous solution with chlorate ion concentration of 50-500g / L by taking lime water and chlorine as raw materials; B) in oxidation section, diluting the prepared aqueous solution to serve as an oxidant, and spraying into the oxidation section from the upper part, so as to contact with smoke entering from the lower part reversely and enable nitric oxide in the smoke to have oxidation reaction; and C) in an absorption section, spraying alkali liquor as an absorbent into the absorption section from the upper part to absorb the oxidized nitric oxide in the smoke to produce corresponding nitrite dissolved in water, thereby achieving the denitration purpose. The new low-cost oxidation denitrating technology has the advantages of being simple in technological flow, low in operation cost and the like.

Description

technical field [0001] The invention relates to a liquid-phase oxidation and denitrification process, in particular to a new low-cost flue gas oxidation and denitrification process. Background technique [0002] Flue gas desulfurization and denitrification are used to control coal combustion product SO 2 One of the important methods of NOx and NOx, based on the current situation of the wide application of wet flue gas desulfurization technology in my country, the development of wet synergistic denitrification technology combined with wet desulfurization has broad industrial application prospects. Since 95% of NOx in the flue gas exists in the form of NO with low solubility, the NO is first oxidized into easily absorbed NO before the wet absorption process. 2 At the same time, the oxidant should be cheap and easy to obtain, and the oxidation product can be recycled. These are the keys to the simultaneous wet desulfurization and denitrification technology. [0003] Among the...

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Problems solved by technology

[0005] Aiming at the problem of high cost of denitrification process in the prior art, the present invention provides a new low-cost flue gas oxidation denitrification process, using cheap lime water and chlorine gas The reaction product of NO is used as an oxidant to oxidize NO to NO2, and then use cheap lime water as an absorbent, which has the advantages of simple process flow and low operating cost.

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