SCR and SNCR denitrification system collaborative control method for pulverized coal power station boiler

Abstract

The invention discloses a SCR and SNCR denitrification system collaborative control method for a pulverized coal power station boiler. The method includes the combustion optimization control and denitrification ammonia injection control optimization. The combustion optimization control includes data measurement and acquisition, data cleaning, establishment of a steady state database and establishment of a rule base. The denitrification ammonia injection control optimization includes control structure optimization and algorithm for realizing denitrification ammonia injection control optimization. The method solves the problem that the thermal NOx emissions in the combustion process of a thermal power plant are of high value and high volatility; solves the problem of high ammonia slip causedby ammonia regulation in the SCR device; and solves the jamming problem caused by the ammonia slip of an air preheater; improves the SCR zone and the regulation stability of the NOx at the outlet ofthe denitrification device; and has strong promotion and application capabilities.

Description

technical field [0001] The invention specifically relates to a method for synergistic control of SCR and SNCR denitrification systems of pulverized coal power plant boilers. Background technique [0002] According to the "Technical Policy on Nitrogen Oxide Prevention and Control in Thermal Power Plants" newly released by the Ministry of Environmental Protection, low-nitrogen combustion technology should become the preferred technology for nitrogen oxide control in coal-fired power plants. The focus of control is on coal-fired generating units and combined heat and power units of 200,000 kilowatts and above nationwide and all coal-fired generating units and combined heat and power units in key air pollution control areas. [0003] Research institutions at home and abroad have done a lot of research work on the combustion optimization of power plants, and proposed data mining rule establishment, operation optimization technology, intelligent control and other technologies and ...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the above-mentioned defects in the prior art and provide a method for synergistic control of SCR and SNCR denitrification systems applied to pulverized coal power plant boilers, which solves the problem of high thermal NOx emission values ​​and fluctuations in the combustion process of thermal power plants. Big problem; solved the problem of high ammonia escape caused by the adjustment of ammonia supply in SCR device; solved the blockage problem caused by ammonia escape of air preheater; improved the adjustment stability of NOx at the outlet of SCR area and denitrification device; can be applied to All units equipped with SCR plus low-nitrogen combustion mode have strong promotion and application capabilities

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