Flue gas desulfurization and denitration technology needs to be continuously improved. Fine desulfurization has the advantages of long process, low sulfur capacity and single function. If the amount of alkalized hydrogen and organic sulfur can be removed in one tower, the benefit will be better. At the same time, it is necessary to strengthen the research on the ability of fine desulfurizer to remove organic sulfur. In addition, experts in the development of technologies such as ether and Thiophene expect that the goal of comprehensively removing organic sulfur compounds can be achieved. The low temperature fine desulfurization process is expected to completely replace the medium temperature desulfurization process with hydrodesulfurization as the core.
Reasonable selection of desulfurization and decarbonization processes. For large nitrogen fertilizer plants, simultaneous desulfurization and decarburization can be achieved by methanol washing, NHD, MDEA, HS, etc., so that H2S, CCI2 and organic sulfur are removed to very low concentrations. In the case of small-scale nitrogen fertilizers using coal-to-gas, the gas is more complicated by oxygen. Since the dry desulfurizer has a small sulfur capacity, it is a last resort before decarburization. In fact, high concentration of CO 2 before decarburization affects desulfurization, especially fine desulfurization. Experts pointed out that in the desulfurization of shift gas, the dry method and the wet method should be combined and used reasonably, so that the cost is small and the effect is excellent.
The release of organic sulfur in fine desulfurization. After the gas in the fine desulfurization passes through the desulfurization equipment, the phenomenon of “sulphur release”, that is, the outlet concentration of carbonyl sulfide is higher than that of the inlet, which affects normal operation. The reasons for this phenomenon are as follows: competitive adsorption of CO2 and CDS; absorption of H2S is relatively lagging, surface enrichment is formed, and CO2 is reacted to form COS; desulfurizing agent is too dry or oxygen is too low, and H2S is enriched at the surface. Can not be converted into monomeric sulfur in time, resulting in the formation of COS. Therefore, in-depth study of the mechanism of sulfur release is of great significance for optimizing process conditions and improving fine sulfur removal.
Desulfurization and denitrification activated carbon is a kind of coal-based granular activated carbon. It is a special product for steel plant sintering tail gas, thermal power plant exhaust gas, large boiler exhaust gas and various smelting tail gas treatment. It can not only simultaneously purify SO2 and NOX, but also remove Hg and reduce Dust pollution. Since desulfurization and denitrification carbon is mostly used in thermal power plants, its use equipment is large in scale and requires activated carbon to be recycled. Therefore, qualified desulfurization and denitrification carbon must have large particles, high strength and can be reused.
The production process of desulfurization and denitrification carbon is to mix a certain proportion of coking coal and coke powder, the passing rate of 200 mesh is more than 90%, and then a certain proportion of tar and water are mixed, and the kneading machine is mixed and stirred. The mold compacting granulator is pressed; the qualified charcoal is carbonized into the external thermal carbonization furnace, and the carbonized material is activated by the Slep furnace, and the activated material enters the packaging workshop and is packaged and put into storage.