Main steam heat supply system with steam supplementing bypass

Abstract

The invention discloses a main steam heat supply system with a steam supplementing bypass. The system comprises a turbine unit and a steam heating unit, wherein a steam pipeline and a cold section pipeline are arranged between the turbine unit and the steam heating unit, the steam output end of the steam heating unit is connected with the steam input end of the turbine unit through the steam pipeline, the steam output end of the turbine unit is connected with the steam input end of the steam heating unit through the cold section pipeline, the steam pipeline comprises a main steam pipeline anda reheating steam pipeline, and a steam supplementing bypass unit is arranged between the main steam pipeline and the cold section pipeline. The main steam heat supply system with the steam supplementing bypass meets the thermal load demand of an industrial heat supply system of a thermal power plant, and the steam supply capacity of the industrial steam supply heat source of the existing thermalpower plant is improved.

Description

technical field [0001] The invention belongs to the technical field of thermal power plants, and in particular relates to a main steam heating system with supplementary steam bypass. Background technique [0002] The heat source of conventionally designed heat supply systems mostly adopts steam turbine extraction for direct supply, temperature reduction and pressure reduction or pressure matching, or cascade use of back pressure machines to provide heat to heat users after performing work. The steam supply capacity of this conventional heating system is often limited by the structure of the steam turbine or boiler. When a new heat load demand arises from a heat user, the thermal power plant does not modify the current host body structure, and its steam supply capacity often cannot meet the new requirements. steam parameters and flow requirements, and the design wall temperature of the reheater is limited, the main steam extraction allowed by the general boiler plant cannot e...

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Problems solved by technology

The steam supply capacity of this conventional heating system is often limited by the structure of the steam turbine or boiler. When a new heat load demand arises from a heat user, the thermal power plant does not modify the current host body structure, and its steam supply capacity often cannot meet the new requirements. steam parameters and flow requirements, and the design wall temperature of the reheater is limited, the main steam extraction allowed by the general boiler plant cannot exceed 10% of the reheater flow, if the new industrial extraction exceeds the main steam extraction In order to avoid overheating of the wall temperature of the reheater, the extraction volume of the main steam cannot meet the demand of the heat load, thereby restricting the external heat supply capacity of the power plant and affecting the economic benefits of the power plant

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