A Boiler Load Control Design Method Based on Continuously Variable Primary Air Pressure

Abstract

The invention discloses a control design method based on continuously-variable primary air pressures for a boiler load. A combined control strategy for the primary air pressures and capacity air valves of coal mills is obtained through analysis and calculation for parameters influencing the boiler load due to primary air pressure adjustment of the double-in and double-out coal mills. The control design method based on the continuously-variable primary air pressure for the boiler load, which is disclosed by the invention, is capable of reducing force output levels of primary air fans of the boiler to achieve an electricity-saving purpose, ensuring that the coal mills always run at economic and safe working points to increase the working efficiency of the coal mills, greatly increasing a load change rate of a unit to achieve a control level of the intermediate storage unit, and realizing coordinated control and stable investment of the unit and increasing the load change rate of the unit to improve a safe running level of the unit.

Description

technical field [0001] The invention specifically relates to a boiler load control design method based on continuously variable primary air pressure. Background technique [0002] The double-inlet and double-outlet steel ball coal mill is one of the main equipments of the direct-blowing pulverization system in thermal power plants. This equipment has high continuous operation rate, convenient maintenance, stable grinding output and fineness, large storage capacity, quick response, It has the advantages of high operating flexibility, low air-to-coal ratio, wide range of coal types, not affected by foreign matter, no need for backup coal mills, etc., and can grind various hard and corrosive coal types. It is the first choice for thermal power plants. A coal mill with superior performance. [0003] For direct-blown coal-fired generator sets equipped with double-inlet and double-outlet coal mills, the boiler load adjustment is to change the control command of the load damper of...

AI Technical Summary

Problems solved by technology

Due to the leakage of the primary air adjustment capacity damper of each coal mill, the adjustment is not linear, and the air volume measurement is inaccurate due to the poor air volume measurement environment, the difference in the characteristics of the capacity damper of each coal mill results in the automatic adjustment of the flow rate. Inconsistency, and in order to ensure stable operation, the probability that the capacity doors of all coal mills are automatically activated is extremely low, which results in poor adjustment quality of the main parameters of the boiler side when lifting and lowering the load

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