A fuel control method and system applied to a circulating fluidized bed boiler

Abstract

The invention discloses a fuel control method and system applied to a circulating fluidized bed boiler. The method comprises the steps that after the deviation between a boiler main steam pressure set value and an actual main steam pressure value is controlled by a boiler master control PID, a fuel control value of the left side and a fuel control value of the right side are output; after the deviation value of the temperature of the left side and the temperature of the right side and a set deviation value are controlled by a temperature PID, a temperature control value of the left side and a temperature control value of the right side are output; after the fuel control value of the left side and the temperature control value of the left side are added, and the sum and the actual fuel amount of the left side are controlled by a fuel PID, an adjusting signal of the coal feed amount of a left coal feeder is output; and after the fuel control value of the right side and the temperature control value of the right side are added, and the sum and the actual fuel amount of the right side are controlled by the fuel PID, an adjusting signal of the coal feed amount of a right coal feeder is output. The fuel control method and system have the beneficial effects that automatic adjustment of the fuel amount of the single side is achieved, and the influence of fuel adjustment on the bed temperature of the other side generated after the fuel amount of the single side fluctuates in a traditional control scheme is changed.

Description

technical field [0001] The invention relates to a fuel control method and system suitable for a circulating fluidized bed boiler, which is used to realize the fuel distribution of the balanced control of the bed temperature on both sides, and particularly relates to a method for realizing the balance of the bed temperature on both sides when the fuel fluctuates abnormally. control. Background technique [0002] Circulating fluidized bed boilers have the advantages of wide adaptability to coal types, high combustion efficiency, good environmental performance, large load adjustment range and high comprehensive utilization value of ash and slag. Various fields such as biomass have been developed rapidly. [0003] The fuel control circuit of circulating fluidized bed boiler is the key link to realize the automatic control of circulating fluidized bed boiler. The load control of the unit is realized through the fuel control circuit, and the fuel volume control circuit also real...

AI Technical Summary

Problems solved by technology

[0007] According to the above control scheme, if the coal feeder on the left side trips due to an accident, in order to maintain stable combustion of the boiler and quickly eliminate the influence of fluctuations in coal feed volume, the coal feed volume of the coal feeder in the running state will increase, which will lead to the overall coal feed rate on the right side. As the amount of coal increases, the bed temperature on the right side will inevitably rise rapidly, which will lead to an increase in the deviation of the bed temperature on the left and right sides, affecting the stability of the unit's operating state, and the rapid rise of the bed temperature on one side will also affect Boiler safe operation

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