A method for wide-load condensate throttling and frequency regulation of thermal power units

Abstract

The invention discloses a wide-load condensate throttling and frequency-regulating method for a thermal power unit. In the high-load section and the condensate pump frequency conversion command does not reach the lower limit, the condensate frequency conversion command is reduced, the condensate flow rate is reduced, and the steam extraction volume of the steam turbine reheating system is reduced. When the unit is in the low load section or the frequency conversion command of the condensate pump has reached the lower limit, the opening of the main valve of the deaerator is reduced, the condensate flow rate is reduced, the steam extraction of the steam turbine recovery system is reduced, and the load of the unit is increased. , so as to realize the primary frequency regulation function of condensate water throttling in wide load section. The invention can solve the disadvantages of the prior art, and realize the throttling and frequency conversion regulation of condensed water in the whole process of the unit in the AGC wide load range.

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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