A fluidized bed activated carbon adsorption and denitrification method for low-sulfur flue gas

Abstract

A fluid bed activated carbon adsorption denitrification method for low-sulfur flue gas is carried out according to the following steps: (1) passing the low-sulfur flue gas into the fluid bed from the inlet of the fluid bed; (2) crushing the activated carbon into activated carbon powder; The powder spraying device sprays activated carbon powder into the fluidized bed, and the activated carbon powder and the low-sulfur flue gas are mixed in the fluidized bed and move to the outlet of the fluidized bed, and perform desulfurization and denitration; (3) Control the flow of the activated carbon powder and the low-sulfur flue gas The contact in the bed is 3 to 10s, the dust is adsorbed and collected in the bag filter; the low-sulfur flue gas is desulfurized, denitrified and dedusted to form purified flue gas and discharged. The method of the invention saves the energy consumption of denitration; the reactor can be very small, and the investment is reduced; the investment and consumption of the catalyst are not required; and the coordinated treatment of pollutants is realized.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and environmental protection, and in particular relates to a fluidized-bed activated carbon adsorption and denitrification method for low-sulfur flue gas. Background technique [0002] The current flue gas denitration methods include SCR, SNCR, moving bed activated carbon adsorption method and oxidation absorption method, and oxidation absorption is divided into dry absorption and wet absorption. SCR, SNCR, and moving bed activated carbon adsorption use ammonia to reduce the denitrification process. The production process of ammonia itself is high energy consumption and high pollution, and the pollutants produced are several times that of ammonia. Using it to denitrify the total amount of pollutants is not The reduction, but the increase, is just the variation and transfer of pollutants. The rationality of this treatment process is open to question; the recovery and treatment of denitrification...

AI Technical Summary

Problems solved by technology

The construction investment is very large, the area is large, and the denitrification also consumes a large amount of energy-intensive ammonia, and the operating cost is high. The sulfur recovery treatment at the rear is a pure industrial process, which is very difficult for non-chemical enterprises to operate and manage.

[0004] At present, most of the high-sulfur flue gas has undergone desulfurization transformation, and most of the sulfur has reached the standard. Since most of them adopt the wet desulfurization process, the flue gas temperature is 50-60°C. If the SCR process is used for denitrification after desulfurization, It needs to consume a lot of energy to raise the temperature; moreover, sulfur and nitrate will be generated during the heating process, which will increase the processing cost

If the SCR process is used for denitrification before wet desulfurization, due to the relatively high sulfur in the flue gas, it is easy to cause catalyst poisoning and affect the denitrification efficiency, especially when low temperature denitrification is used; higher