一种供汽系统
By adding reheat extraction and reheater recirculation pipelines to the boiler and turbine system, combined with ventilation bypass pipelines, the problem of insufficient steam pressure under deep peak shaving conditions was solved, the stable and reliable operation of the steam supply system was achieved, and the stable supply of industrial steam was ensured.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUODIAN LONGYUAN ENERGY SAVING TECH
- Filing Date
- 2025-09-30
- Publication Date
- 2026-07-17
AI Technical Summary
In traditional boiler and turbine thermal systems, the rigid coupling of steam supply and demand under deep peak-shaving conditions results in steam pressure that cannot meet industrial steam requirements, affecting the stability and reliability of steam supply.
By adding reheat extraction pipes and reheater recirculation pipes, the boiler and turbine are thermally decoupled. Combined with ventilation bypass pipes to discharge cooling exhaust steam from the high-pressure cylinder, the rigid coupling between steam output and consumption is broken, ensuring stable steam parameters.
Under the deep peak-shaving conditions of low-load operation of the steam turbine, the boiler can still stably output steam that meets the pressure requirements of industrial steam, avoiding the problem of steam pressure drop, optimizing the system operation status, and ensuring the stability and reliability of the steam supply system.
Smart Images
Figure CN224515247U_ABST
Abstract
Claims
1. A steam supply system comprising a boiler and a steam turbine, the boiler having an economizer, a superheater and a reheater, and the steam turbine having a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder; wherein The outlet of the superheater is connected to the steam inlet of the high-pressure cylinder via the main steam pipeline. The exhaust port of the high-pressure cylinder is connected to the inlet of the reheater via the reheat cold section steam pipeline. The outlet of the reheater is connected to the steam inlet of the intermediate-pressure cylinder via the reheat hot section steam pipeline. The exhaust port of the intermediate-pressure cylinder is connected to the steam inlet of the low-pressure cylinder via the medium-low pressure steam guide pipeline. The exhaust port of the low-pressure cylinder is connected to the inlet of the economizer via the condensate return water pipeline. The outlet of the economizer is connected to the inlet of the superheater. Its characteristic is that it further includes: A reheat extraction steam pipeline, one end of which is connected to the reheat hot section steam pipeline, and the other end of which is used for external steam supply; The reheater recirculation pipe has one end connected to the main steam pipe and the other end connected to the reheat cold section steam pipe, which is used to achieve thermal decoupling between the boiler and the steam turbine. A ventilation bypass pipe is provided, one end of which is connected to the reheat cold section steam pipe, and the connection point between the ventilation bypass pipe and the reheat cold section steam pipe is located between the connection point between the reheater recirculation pipe and the reheat cold section steam pipe and the exhaust port of the high-pressure cylinder. The other end is used to discharge the cooling exhaust steam from the high-pressure cylinder.
2. The steam supply system according to claim 1, characterized by Also includes: A desuperheater is installed on the reheater recirculation pipe to reduce the temperature of the steam in the reheater recirculation pipe.
3. The steam supply system according to claim 2, characterized by Also includes: A desuperheating water delivery pipeline, one end of which is connected to the condensate return water pipeline and the other end of which is connected to the desuperheating water inlet pipe of the desuperheater, is used to deliver desuperheating water to the desuperheater.
4. The steam supply system according to claim 2, characterized by Also includes: A back pressure unit is connected in series on the reheater recirculation pipeline, and the exhaust port of the back pressure unit is connected to the steam inlet of the desuperheater, for recovering the pressure energy of the steam in the reheater recirculation pipeline.
5. The steam supply system according to claim 3, characterized by The condensate return pipeline is sequentially equipped with a condenser, a condensate pump, a first heat exchanger belonging to the low-pressure regenerative system, and a second heat exchanger belonging to the high-pressure regenerative system along the fluid flow direction. The connection point between the desuperheating water delivery pipeline and the condensate return pipeline is located at the outlet end of the condensate pump.
6. The steam supply system according to claim 5, characterized by The end of the ventilation bypass pipe away from the reheat cold section steam pipe is connected to the steam side inlet of the condenser, and is used to introduce the high-pressure cylinder cooling exhaust steam into the condenser for condensation.
7. The steam supply system according to claim 5, characterized by A deaerator is also connected in series on the condensate return water pipeline; The deaerator is located between the outlet end of the first heat exchanger and the inlet end of the second heat exchanger, and is used to remove dissolved oxygen from the condensate.
8. The steam supply system according to claim 5, characterized by A water supply pump is also installed on the condensate return pipe, and the water supply pump is located downstream of the second heat exchanger along the fluid flow direction.
9. The steam supply system according to claim 5, characterized by Also includes: A water supply pipe, one end of which is a water supply port, and the other end of which is connected to the water-side inlet of the condenser.
10. The steam supply system according to claim 1, characterized by Also includes: A middle joint gate is arranged in series on the reheating hot-steam pipe and between the communication point of the reheating extraction pipe and the reheating hot-steam pipe and the steam inlet of the middle pressure cylinder, for controlling the steam quantity delivered by the reheater to the middle pressure cylinder.