Liquid-phase oxidation catalyst for fire coal flue gas desulfurization

Abstract

The invention discloses a liquid phase oxidation catalyst which is used to desulphurize fire coal flue gas. The invention comprises a surface active agent, M2+1, M3+2 and industrial-grade urea, wherein the mass ratio between the surface active agent and the industrial grade urea is 1:40-1:60, the solution mass concentration ratio between the M2+1and the M3+2 is 10:1-30:1, the mass ratio between the surface active agent and the M2+1 is 1:80-1:90, and M is Mn or Fe or Mg. The oxidative catalyst of the invention is very easy to be dissolved in water, and water solution is weakly-acidic. Density range is 2.75-2.93*103kg.m-3, and physiochemical stability is comparatively good. The invention only has catalytic oxidative effect in the process of flue gas desulphurization and no consumption theoretically, and can be used in circulation. The oxidative catalyst of the invention is adopted to desulphurize the fire coal flue gas, desulphurizing efficiency can be increased, simultaneously a desulphurizing process can be simplified (without an oxidation draught fan process), the operational cost of the flue gas desulphurization can be lowered greatly, and the invention has great practical applicable value and wide applicable foreground.

Description

technical field [0001] The invention relates to a catalyst, in particular to a liquid-phase oxidation catalyst for coal-fired flue gas desulfurization. Background technique [0002] At present, my country's annual SO emissions 2 It has reached more than 24 million tons, and the area of ​​acid rain has reached more than 1 / 3 of the country's land area. Acid rain has become an important factor restricting my country's economic development. Control SO 2 , NOx and other emissions are key measures to prevent acid rain. Flue Gas Desulfurization (FGD) is currently the most important way of desulfurization, it is the control of acid rain and SO 2 The main technical means of pollution. So far, hundreds of flue gas desulfurization technologies have been developed at home and abroad, which can be divided into two categories: dry method and wet method. Wet desulfurization technology has the characteristics of simultaneous desulfurization and dust removal, flexible maneuverability, ...

AI Technical Summary

Problems solved by technology

[0004] (1) In this traditional FGD mode, the absorbent and flue gas SO 2 Direct contact reaction is carried out in the absorption tower, which brings some serious problems, such as equipment scaling and serious corrosion;

[0005] (2) In the calcium-alkali method, the absorption liquid is in a suspended emulsion, which is easy to deposit during transportation, which is one of the main reasons for serious pipeline blockage;

[0007] (4) The absorbent is in direct contact with the flue gas, except for the absorbent with SO 2 In addition to the direct reaction, it will also react with other gases in the flue gas (such as CO 2 etc.) resulting in unnecessary consumption

[0008] So far, a lot of research work has been done on flue gas desulfurization at home and abroad, and various dry and wet desulfurization technologies have been studied and applied to reduce SO 2 emissions played a greater role, but for low concentrations of SO 2 Flue gas removal, desulfurization technology requires large investment, high operating costs, easy blockage of pipelines, difficult management and maintenance, etc. Therefore, it is urgent to develop simple and economical desulfurization technology