Ammonia injection control method and device for activated carbon desulfurization and denitrification system

Abstract

The invention discloses a method and a device for controlling the amount of ammonia injection in an activated carbon desulfurization and denitrification system. The method includes: obtaining inlet flue gas state data, outlet flue gas state data, inlet flue gas flow rate after temperature and pressure compensation, and ammonia dilution air flow; After temperature and pressure compensation, ammonia dilution air flow rate and preset parameters, calculate the correction value of the first ammonia injection amount according to the preset first calculation model; calculate and correct the first ammonia injection amount according to the preset second calculation model The value corresponds to the target value of the first ammonia injection amount. By applying the technical scheme provided by the invention, the amount of ammonia injection can reach a relatively ideal value, so that the desulfurization and denitrification effects meet the requirements.

Description

technical field [0001] The invention relates to the technical field of control, in particular to a method and device for controlling the amount of ammonia injection in an activated carbon desulfurization and denitrification system. Background technique [0002] The SO produced by the flue gas in the sintering process 2 and NOX (nitrogen oxides) account for the vast majority of the total emissions of iron and steel enterprises, in order to achieve the national 2 and NOX emission standards, the sintering flue gas must be desulfurized and denitrified. For the sintering machine flue gas in the iron and steel industry, the desulfurization and denitrification devices and processes using activated carbon adsorption towers and desorption towers are ideal. [0003] The activated carbon adsorption tower is used to adsorb pollutants including sulfur oxides, nitrogen oxides and dioxins in the sintering flue gas, while the desorption tower is used for thermal regeneration of activated ...

AI Technical Summary

Problems solved by technology

The selection of the amount of ammonia injection should not only meet the target value of denitrification of the system, but also prevent ammonia from the flue gas outlet from being sprayed too much, which does not meet the national environmental protection standards. Therefore, we need to reasonably control the amount of ammonia injection in the system

[0004] In the prior art, generally the operator manually adjusts the amount of ammonia injection (in the activated carbon desulfurization and denitrification system) according to his own experience. Specifically, the operator manually modifies the target value of the ammonia injection amount several times based on experience until the desulfurization and denitrification effect meets the requirements. So far, the reliability is poor, and it is difficult for the system to obtain the optimal amount of ammonia injection, which leads to the failure to achieve the ideal desulfurization and denitrification effect. That is, too much ammonia injection will waste ammonia gas, increase operating costs, and even bring in air to cause secondary pollution. If the amount of ammonia injection is not enough, the required desulfurization and denitrification effect cannot be achieved.

Images