Steam turbine-boiler decoupling system and method for improving peak regulation capacity of pure condensing thermal power generating unit

Abstract

The invention belongs to the field of thermal power generation, and particularly relates to an steam turbine-boiler decoupling system and method for improving the peak regulation capacity of a pure condensing thermal power generating unit. When the unit participates in power grid peak regulation and needs to reduce output, part of main steam and / or reheated steam are / is extracted to enter a heat storage system, and part of heat is stored in the heat storage system. When the unit participates in power grid peak regulation and needs to increase output, according to the reasonable matching principle of parameters and heat, the heat storage capacity of the heat storage system is sent back to a thermodynamic system, so that the output of the unit is larger than the corresponding boiler load, or new steam is generated through heat release of the heat storage system and enters a steam turbine generator unit for peak. The total output of the steam turbine generator unit is higher than the rated load capacity of a boiler, and the peak capacity of a power plant is improved. According to the scheme, decoupling operation of the boiler and the steam turbine is achieved, the minimum output of the unit can not be limited by the minimum stable combustion load of the boiler, the maximum output can exceed the maximum output of the boiler according to needs, and the peak regulation load range and flexibility of the unit are greatly increased.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a decoupling system and method for a boiler and furnace for improving the peak-shaving capability of a pure condensing thermal power unit. Background technique [0002] At present, thermal power still occupies an absolute dominant position in my country's power generation structure. In order to reduce carbon emissions, it is necessary to strictly control the total amount of coal-fired power generation. At the same time, coal power will still play the role of "ballast stone" for power supply for a period of time in the future. With the advancement of carbon emission control work, new energy sources such as wind power and photovoltaics will be connected to the grid on a large scale, bringing challenges to the grid with a high proportion of renewable energy and high proportions of power electronic equipment. The role of coal power as a "base-load power su...

AI Technical Summary

Problems solved by technology

At present, the flexibility of thermal power units is limited by the coupling relationship between the boiler and the steam turbine. When wide-load operation is required, the steam turbine has a better load regulation capability, but the boiler is limited by the minimum stable combustion load and cannot further reduce the load rate, which limits the unit. peak shaving ability

Images