Mathematical support for the control system for nitrogen oxide emissions in boilers with furnaces with liquid slag removal

Abstract

When burning high-calorie low-volatile brands of coal in furnaces with liquid slag removal to achieve the standard concentration of nitrogen oxides in the outlet gases of the boiler, it is necessary to use two methods of reducing the concentration, for example, staged combustion and selective non-catalytic reduction. For optimal control of the two-stage process of successive concentration reduction, it is necessary to develop appropriate mathematical support that guarantees the maintenance of the standard concentration at any load of the boiler and minimizes the operating costs of reducing emissions. The scheme of mathematical support functioning is presented, which is an information processing system, the input of which is a signal from the steam load sensor of the boiler, and the output is a tasks for the regulators of the degree of stepwise combustion of fuel and urea supply, which ensure the optimal mode of operation of the emission control subsystem. The key issues of system development and operation are considered.