一种火电厂冬季低能耗暖风器系统
By designing the condensate and heat transfer fluid circuits, the low-grade steam from the steam turbine and antifreeze are used to indirectly heat the air heater, solving the problems of high energy consumption and condensate freezing in thermal power plants under extremely cold environments, and achieving low-energy, high-efficiency heating and safe operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
- Filing Date
- 2025-06-26
- Publication Date
- 2026-07-17
AI Technical Summary
The use of auxiliary steam heating heaters in thermal power plants in extremely cold environments leads to increased energy consumption and operating costs, and poses a risk of condensate freezing and blockage, which violates the dual carbon targets and the safety of the units.
The system employs a condensate circuit and a heat transfer fluid circuit, utilizing low-grade steam from the turbine and antifreeze heat transfer fluid to indirectly heat the air heater. Low-energy heating is achieved through the mixing and regulation control of the condensate and heat transfer fluid.
Effectively utilizing the waste heat of the steam turbine reduces energy consumption of the heater system, lowers operating costs, prevents condensate from freezing and blockage, and improves system safety.
Smart Images
Figure CN224516831U_ABST
Abstract
Claims
1. A low energy consumption winter air heater system for a fossil fuel power plant, characterized by, include: Condensate circuit (1), wherein a condenser (11) and a condensate pump (12) are configured in the condensate circuit (1). The condenser (11) is connected to the external low-pressure cylinder (a) of the steam turbine, receives the steam discharged from the low-pressure cylinder (a) of the steam turbine, and generates condensate with residual heat after heat exchange. The condensate pump (12) introduces the condensate into the tubular heat exchanger (2) for heat exchange and then returns it to the condenser (11). A tubular heat exchanger (2) includes a shell side and a tube side with independent internal spaces for heat exchange. The shell side is arranged in the condensate circuit (1) to allow condensate to pass through, and the tube side is arranged in the heat transfer fluid circuit (3) to allow antifreeze heat transfer fluid to pass through. The heat transfer fluid circuit (3) is equipped with a heat transfer fluid pump (31) and a heater (32). The heat transfer fluid pump introduces the heat transfer fluid that has been heated by condensate in the tubular heat exchanger (2) into the heater (32). The heat transfer fluid heats the outside gas that is about to enter the heater (32). After the heat transfer fluid and the outside gas exchange heat, the heat transfer fluid flows back to the tubular heat exchanger (2) for heat exchange again.
2. The low energy winter air heater system for a fossil fuel power plant of claim 1, wherein, The condensate pump (12) has a first branch pipe (13) and a second branch pipe (14) branched out from the end of the main pipe. The first branch pipe (13) is directly connected to the tubular heat exchanger (2). The second branch pipe (14) is equipped with a final stage low-pressure heater (15). The final stage low-pressure heater (15) includes an end steam channel and an end condensate channel with independent internal spaces for heat exchange. The end steam channel receives low-grade steam discharged from the external turbine low-pressure cylinder (a). The end condensate channel receives condensate branched from the condensate pump (12). The condensate is heated by the low-grade steam to form heated condensate. The heated condensate output from the end of the second branch pipe (14) and the condensate output from the end of the first branch pipe (13) are merged and input into the tubular heat exchanger (2).
3. The winter low energy air heater system for a fossil fuel power plant of claim 2, wherein, The low-grade steam discharged from the external turbine low-pressure cylinder (a) received by the final stage low-pressure heater (15) is the third extraction steam located at the throat of the turbine low-pressure cylinder (a), and the temperature of the first extraction steam, second extraction steam and third extraction steam discharged from the turbine low-pressure cylinder (a) decreases in sequence.
4. The low energy winter air heater system for a fossil fuel power plant of claim 2, wherein, It also includes a valve mixing module, which is used to adjust the output flow rate of the condensate in the first branch pipe (13) and the heating condensate in the second branch pipe (14), thereby adjusting the temperature of the mixed condensate entering the tubular heat exchanger (2) after merging.
5. The low energy winter air heater system for a fossil fuel power plant of claim 1 wherein, The condenser (11) is equipped with a hot well (111) at its end to contain the generated condensate.
6. The low energy winter air heater system for a fossil fuel power plant of claim 1 wherein, The condensate pump (12) includes two pump sets, one for use and one for standby.
7. The low energy winter air heater system for a fossil fuel power plant of claim 1 wherein, The heat transfer fluid circuit (3) is also equipped with an expansion tank (33) for pressure stabilization.
8. The low energy winter air heater system for a fossil fuel power plant of claim 1 wherein, The heat medium in the heat medium circuit (3) is an antifreeze with a freezing point below zero degrees.
9. The low energy consumption winter air heater system for a fossil fuel power plant of claim 1, wherein, The heat transfer fluid pump (31) is a variable frequency pump.