Thermal power generating unit flexible regulation and control system integrated with steam energy accumulator and working method

Abstract

The invention discloses a thermal power generating unit flexible regulation and control system integrated with a steam accumulator and a working method. During low-load operation or load reduction of a unit, exhaust steam of a high-pressure cylinder is injected into a medium-pressure steam accumulator for steam storage; exhaust steam of the medium-pressure cylinder is injected into the low-pressure steam accumulator for steam storage, working media of the medium-pressure cylinder and the low-pressure cylinder are reduced by storing the steam, and low-load operation or rapid load reduction of the unit is achieved. When the load of the unit is increased, steam in the medium-pressure steam accumulator is released to serve as heating steam of the high-pressure heater and the deaerator; and steam in the low-pressure steam accumulator is released to serve as heating steam of the first low-pressure heater and the second low-pressure heater, so that steam extraction of the steam turbine is reduced, and rapid load rising of the unit is achieved. By storing and releasing steam of the medium-pressure steam accumulator and the low-pressure steam accumulator, the variable load rate of the unit is increased, the operation range of the coal-fired power generation unit can be widened, ultra-low load operation is achieved, and the power generation efficiency of the coal-fired power generation unit during rapid variable load operation is improved.

Description

technical field [0001] The invention belongs to the technical field of power generation, and in particular relates to a flexible control system and a working method of a thermal power unit integrated with a steam accumulator. Background technique [0002] Wind energy and solar energy are mostly intermittent and fluctuating, making it difficult for renewable energy generation and consumption. At the same time, the current lack of flexible power supply in the power grid has brought a huge impact on the stability and security of the power system. The flexibility of coal-fired power generating units means that the unit can greatly change the load and realize ultra-low load operation in the steady state, and can quickly increase and decrease the load during the transient process of changing conditions. However, in actual operation, affected by the minimum stable combustion load of the boiler and other operating conditions, the operating load range and variable load rate of the un...

AI Technical Summary

Problems solved by technology

However, in actual operation, affected by the minimum steady combustion load of the boiler and other operating conditions, the operating load range and variable load rate of the unit are limited

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