Desulfurization and denitration activated carbon adsorption principle
2021-12-25 14:09
Because the Desulfurization and denitration activated carbon has a large specific surface area and a very developed pore structure, the activated carbon has a super adsorption capacity, and the surface of the activated carbon contains multiple oxygen-containing functional groups, so the activated carbon is not only an excellent adsorbent, but also a catalyst. And catalyst carrier. In the adsorption process of activated carbon, through the catalysis of activated carbon, sulfur dioxide is oxidized to sulfur trioxide and reacted with water vapor to form sulfuric acid, which is fixed on the internal pores of activated carbon, thereby realizing the removal of columnar activated carbon from the role of desulfurization and denitrification in exhaust gas.
The reaction equation Desulfurization and denitration activated carbon working is as following:
2 SO2 +2 H2O +O2 =2H2SO4
Then by heating, the sulfuric acid is evaporated and recovered, and the activated carbon after the recovery of the sulfuric acid is regenerated and can be reused.
The regeneration reaction equation of Desulfurization and denitration activated carbon working is as following:
2H2SO4+C=2SO2+2H2O+CO2,
For NOX, in the presence of SO2, NO reacts with NH3,
The response is as follows:
2NO+C=N2+CO2,
2NO2+2C=N2+2CO2,
2NH3+1.5O2=N2+3H2O,
4NO+4NH3+O2=4N2+6H2O
Desulfurization and denitration activated carbon working process
First of all, the flue gas containing sulfide and nitrogen oxides, after dust removal and cooling, is sent to the adsorption tower by a fan. Activated carbon adsorption, under the action of activated carbon catalysis, sulfur dioxide is oxidized to sulfur trioxide, NOX is converted and decomposed into N2, and the adsorbed gas is discharged from the chimney as standard exhaust gas.
Subsequently, the activated carbon in the adsorption tower moves downward with the moving bed. The adsorption effect determines the downward speed. The adsorption effect is good, and the lower sulfur dioxide content will slow down the downward speed. On the contrary, the adsorption effect is not good, and the sulfur dioxide content is high. The moving speed will be faster.
Finally, when Desulfurization and denitration activated carbon moves down, the regenerated activated carbon is added from the upper part of the adsorption tower by the hoist or the new activated carbon in the storage tank is used to supplement the space left under the activated carbon. Second, the discharged activated carbon is sent to the regeneration by the hoist The tower is regenerated by water vapor, and then the sulfuric acid in the activated carbon is evaporated. The evaporated acid gas is indirectly water-cooled to become dilute sulfuric acid, and then the impurity in the calculation is separated by the separation pen and put into the acid storage tank through the concentrator. , The process of desulfurization and denitrification is completed.
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