Flue gas deep treatment method for simultaneous desulfurization and denitrification by absorption method

Abstract

The invention discloses a flue gas deep treatment method for simultaneous desulfurization and denitrification by an absorption method. The method uses a natural manganese oxide ore or a synthetic nanomanganese oxide which is added with a surfactant as an absorption liquid of NO<x> and SO2 to realize flue gas purification. According to the simultaneous desulfurization and denitrification method, the SO2 removal rate is maintained to be 95% or more, the NO removal rate is maintained to be 80% or more, reaction products can be separated and utilized, the operation cost is low, and the prospect is good.

Description

technical field [0001] The invention belongs to the field of air pollution control engineering, and in particular relates to a wet absorption method synchronous desulfurization and denitrification flue gas treatment method. Background technique [0002] Various types of boilers and kilns produce a large amount of SO in the process of high temperature combustion 2 , NOx, resulting in acid rain in 81.6% of cities across the country. Nitrogen oxide emissions can also lead to regional environmental pollution problems such as photochemical smog and ozone layer depletion. Current technologies for controlling NOx emissions include Selective Catalytic Oxidation (SCO), Non-Selective Catalytic Reduction (SNCR) and Selective Catalytic Reduction (SCR). Desulfurization processes are mainly wet and semi-dry, among which calcium desulfurization is the main one, accounting for about 85% of the market. At present, the flue gas purification process widely used in my country is the combined...

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Problems solved by technology

Patent CN107744715A uses the main product ammonium sulfite in the ammonia desulfurization process as NO, SO 2 Absorbent, use bubbling method and add absorption aid CuO in the absorption liquid to solve the problem of NO insoluble in water, but there are secondary pollution problems such as ammonia volatilization

Patent CN101574617B uses the pulp prepared from pyrolusite and metal chelating agent as absorbent to absorb SO in coal-fired flue gas 2 , NO x Synchronous absorption and removal, the metal chelating agent is used to remove calcium, magnesium, lead, zinc, iron and other multivalent metal ions in pyrolusite pulp, eliminating the problem that metal ion precipitation and scaling affect the desulfurization interface reaction. After solid-liquid separation, the mother liquor can be Utilize the poor solubility of manganese sulfate and manganese nitrate at the same temperature to realize the recycling of sulfur and manganese, but it does not improve the solubility of NO in the absorption liquid, and there is a problem of low NO removal rate

[0004] When previous studies used strong oxidants such as sodium chlorite and ozone, although NO and SO 2 The removal efficiency is high, but most of the oxidants are relatively expensive, and the investment and operation costs are high, so it is difficult to apply industrially; if the absorption liquid such as ammonium sulfite and pyrolusite slurry is used, the NO removal rate is low, generally 60- 70%, difficult to meet industrial emission standards

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