Power control method of heat storage peak shaving system under heat storage and heat release working conditions

Abstract

The invention provides a power control method of a heat storage peak shaving system under heat storage and heat release working conditions. The heat storage peak shaving system is included. In a heatstorage mode, after condensed water (cold water) sent out by a condensed water pump passes through a heater, the cold water is changed into hot water, one path of hot water enters a deaerator, the other path of hot water enters a water storage tank, and the equal amount of cold water is discharged to a condenser from the water storage tank. Due to the fact that the total amount of hot water entering the deaerator is relatively fixed, the flow entering the water storage tank is increased, the flow passing through the heater is also increased, the generating power of a unit is reduced, and viceversa. In a heat release mode, one path of condensed water sent out by the condensed water pump passes through the heater to enter the deaerator, the other path of the condensed water sent out by thecondensed water pump enters the water storage tank, and the equal amount of hot water is pumped to the deaerator from the water storage tank through a booster pump. Due to the fact that the total amount of hot water entering the deaerator is relatively fixed, the flow pumped out of the water storage tank is increased, the flow passing through the heater is reduced, the generating power of the unitis increased, and vice versa. An applicant proposes a heat storage technology by using the water storage tank, the ramp rate of the unit is increased, a power grid dispatching instruction is rapidlyresponded, and the power control method of the heat storage peak shaving system under heat storage and heat release working conditions is a new mode for increasing the ramp rate of the unit.

Description

technical field [0001] The invention designs the field of thermal power generation technology peak regulation, and specifically relates to a heat storage peak regulation system and a control method thereof. Background technique [0002] In order to meet the needs of the rapid development of renewable energy and improve the capacity of renewable energy consumption, it is urgent to improve the flexibility of the power grid. Among them, the flexibility of load adjustment includes: deep peak shaving (low load operation of boiler and steam turbine), rapid start and stop of units, ramp rate of units, and thermoelectric decoupling of combined heat and power units. [0003] At present, the rapid adjustment of the power generation of the unit mainly uses the steam inlet valve of the steam turbine to release the heat storage capacity of the boiler in the short term; the condensate throttling optimization method changes the condensate flow through the heater in a short time. [0004] ...

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Problems solved by technology

[0004] Although the use of boiler heat storage capacity can quickly respond to dispatching instructions, the heat storage capacity is limited, which can only increase the output of the unit in the short term, and cause large fluctuations in the main steam pressure

The optimization method of condensate throttling reduces the flow rate of the condensate regulating valve and relies on the self-balancing ability of the low-pressure heater of the unit to increase the output power of the steam turbine. However, when the condensate flow rate is greatly changed, the water level of the deaerator and the water level of the condenser Both will be greatly disturbed, changing the condensate flow rate for a long time will affect the safe operation of the unit, and the continuous capacity cannot be guaranteed

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