Wide-load condensate throttling frequency modulation method of thermal power generating unit

Abstract

The invention discloses a wide-load condensate throttling frequency modulation method of a thermal power generating unit. When condensation pump variable frequency instructions do not reach a lower limit on a high-load section, condensate variable frequency instructions are reduced, the condensate flow is reduced, the steam extracting quantity of a steam turbine regeneration system is correspondingly reduced, and the unit load is increased; and when the unit is located on a low-load section or the condensation pump variable frequency instructions reach the lower limit, the openness of a deaerator main valve is reduced, the condensate flow is reduced, the steam extracting quantity of the steam turbine regeneration system is correspondingly reduced, and the unit load is increased to achievecondensate throttling once frequency modulation function of a wide-load section. The method can solve the defects in the prior art, and realizes the condensate throttling variable frequency modulationin the whole AGC wide-load section of the unit.

Description

technical field [0001] The invention relates to the technical field of generating set control, in particular to a method for throttling and frequency-regulating wide-load condensate water of thermal power generating sets. Background technique [0002] Usually, in order to reduce the throttling loss of the steam turbine valve, it is necessary to maintain the high-speed valve at a large opening, but the upward margin of the valve under this operation mode is small, resulting in a weak capacity of the unit for primary frequency regulation and load, which will directly affect the response of the unit to the power grid. Deep FM capability under large deficit. [0003] Condensation-saving, flow-saving, frequency-regulating is an effective improvement scheme, and its essence is to use steam turbine heat storage to make up for the lack of boiler heat-storage and frequency-regulation capabilities. There are two main ways to achieve condensate throttling, one is to use the main valve...

AI Technical Summary

Problems solved by technology

There are two main ways to achieve condensate throttling, one is to use the main valve of the water level of the deaerator to adjust, and the other is to use the command of the condensate pump frequency converter to achieve adjustment. In current engineering applications, one of the solutions will be selected, but This will lead to frequent actions of the actuator of a certain equipment, increasing the failure rate of the equipment, and if only relying on the frequency conversion adjustment of the condensate pump, under low load conditions, when the command of the condensate pump frequency converter is reduced too much, it will directly affect the condensate jellyfish tube. Pressure and Condensate User Safety

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