Four-major-pipeline header system connecting system for deep peak regulation and operation method of four-major-pipeline header system connecting system

Abstract

The invention discloses a four-major-pipeline header system connecting system for deep peak regulation and an operation method of the four-major-pipeline header system connecting system. The four-major-pipeline header system connecting system comprises a steam turboset steam-water system and an additional system, wherein main steam, reheating cold section steam, reheating hot section steam, low-pressure cylinder extraction steam and final feed water correspondingly communicate to corresponding mother pipes by the additional system, when part of unit boiler shut down, hot standby or two-shift system operation is carried out, a boiler shut-down unit steam turbine can obtain the main steam and the reheating steam by controlling a connecting valve set between each mother pipe and the unit, cold and reheated steam of the boiler shut-down unit is recycled, boiler tripping without turbine tripping is achieved, in addition, a condensate pump and a water feeding pump of the boiler shut-down unit do not work, and more energy is saved. By the adoption of the four-major-pipeline header system connecting system for the deep peak regulation and the operation method of the four-major-pipeline header system connecting system, the unit can further achieve boiler and turbine decoupling under the few-boiler and multi-turbine operation working condition, and the output electric rate of a steam turbine generator unit under the deep peak regulation operation working condition is further reduced under the normal operation condition of the boiler put into operation.

Description

technical field [0001] The invention belongs to the field of thermal power generation, and in particular relates to a connection system and an operation method for four main pipelines for deep peak regulation. Background technique [0002] In order to achieve the long-term goal of carbon peaking and carbon neutrality, new clean energy sources such as photovoltaics and wind power will continue to be built and put into use in large quantities in the future. , Stable operation puts forward new and higher requirements. Under such conditions, it has become an inevitable trend for thermal power units to participate in peak shaving or even deep peak shaving. [0003] In China, at present, large-capacity thermal power units (≥300MW) widely adopt the unit system design, and the units are always operated in the mode of "one furnace, one machine", that is, a single boiler supplies steam for a specific single steam turbine to generate electricity. Since the normal operation of the boi...

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Problems solved by technology

Since the normal operation of the boiler equipment has a minimum limit on the load of the unit, this unitary operation mode limits the actual deep peak-shaving capability of the unit and reduces the flexibility of the unit under the operating condition of deep peak-shaving

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