Coupling control method for removing SO2 and NOx by wet ammonia absorption method applied to comprehensive energy

Abstract

The invention provides a coupling control method for removing SO2 and NOx by wet ammonia absorption method applied to comprehensive energy. The method includes: the practical ammonia supplement quantity, during a pH value control process, is regulated by the decoupling coefficient in a decoupling module and then is added to a desulfuration control step; when the ammonia quantity target set value is changed, pre-adjustment on the circulating quantity of absorption solution is conducted so as to counteract a part of interference, and the parameters during the process are more stable, thus maintaining the system reliability. In the invention, a sectional decoupling scheme is designed, wherein corresponding decoupling coefficients are set according to different input quantity of ammonia in a spray diffusion column, wherein the coefficients are switched in the operation process, thus achieving the sectional decoupling control. The ammonia addition quantity in the practical production is divided into three ranges, wherein the decoupling coefficients corresponding to the three ranges are obtained through tests, and corresponding decoupling coefficient is selected according to the range ofthe present ammonia quantity for regulation, thereby improving control precision.

Description

technical field [0001] The invention relates to the field of automatic control, in particular to a wet ammonia absorption method applied to comprehensive energy to remove SO 2 and NO x coupling control method. Background technique [0002] Coal-burning pollutants are one of the main sources of air pollutants, and the treatment of flue gas pollutants from various forms of coal-fired boilers is an important work for air pollution control in the industrial field. Wet desulfurization, especially the limestone-gypsum wet spray desulfurization technology is a desulfurization technology adopted by coal-fired business owners. Although the desulfurization efficiency of this technology can reach 95%, the desulfurization tower inlet SO 2 For example, if the concentration is 1500mg / Nm3, the desulfurization efficiency needs to reach 97.7% to make it export SO 2 Less than 35mg / Nm3. At present, the main method to deal with this problem is to carry out the transformation of the desulfur...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a wet ammonia absorption method applied to comprehensive energy to remove SO 2 and NO x Coupling control method, in order to at least solve the problem of uncoordinated control and poor desulfurization and denitrification effect in the existing desulfurization and denitrification technology. The specific scheme is as follows:

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