Coal-fired boiler combustion control method based on online self-optimization of air excess coefficient

Abstract

The invention discloses a coal-fired boiler burning control method based on the on-line self-optimization of excess air coefficients. The specific method comprises the steps that step 1, the size of coal feed amount is automatically adjusted by adopting a fuzzy control method; step 2, an optimal excess air system is determined; step 3, the flue gas oxygen content of a furnace outlet is detected according to an oxygen content sensor; step 4, a current furnace temperature value Tb is recorded; step 5, correction is performed on the optimization process; step 6, the excess air coefficients are monitored in real time when the boiler optimization is over and the steady-state operation starts; step 7, the CO percentage content in flue gas of the furnace outlet is monitored; step 8, after the optimization is over, the furnace temperature reaches the peak and may exceed a preset value of the furnace temperature, and then the coal feed amount is automatically adjusted through the fuzzy control. The coal-fired boiler burning control method based on the on-line self-optimization of the excess air coefficients has the advantages that the heat efficiency of the boiler is improved, energy sources are solved, and the exhaust of atmospheric pollutants NOX can be effectively reduced through the self-optimization of the excess air coefficients.

Description

technical field [0001] The invention relates to an online self-optimization control method, in particular to an online self-optimization control method for coal-fired boiler combustion based on an air excess coefficient. Background technique [0002] At present, there is a common problem in my country's industrial coal-fired boilers that the boiler operating efficiency is far lower than the design efficiency. The reason is mainly caused by imperfect detection methods and low control and adjustment levels. Due to changes in coal quality and load, the combustion conditions of coal-fired boilers cannot be tracked and adjusted in time, and deviate from the optimal combustion state; at the same time, in order to fully burn the fuel, the air volume is often increased, resulting in a large air excess coefficient In the normal range of 1.2 to 1.75, the heat loss of the coal-fired boiler is large and the thermal efficiency is low. At present, in the prior art, the control method of ...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems in the prior art that the air-to-coal ratio cannot be automatically adjusted in time with the change of coal supply, resulting in poor air-to-coal ratio, large heat loss of coal-fired boilers and reduced thermal efficiency of the boiler. A coal-fired boiler combustion control method based on online self-optimization of air excess coefficient

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