Thermal power plant auxiliary machine steam-electricity dual-power drive and power generation system and method
A dual-power drive and power generation system technology, applied in the direction of machine/engine, mechanical equipment, liquid variable capacity machinery, etc., can solve the problem that the output of the small steam turbine cannot meet the maximum power of the induced draft fan, and the small steam turbine driven by the induced draft fan deviates from the high-efficiency point. Induced fan power increase and other issues, to achieve the effect of reducing power consumption rate, saving initial investment and improving efficiency
Pending Publication Date: 2017-09-05
XIAN XIRE ENERGY SAVING TECH
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Problems solved by technology
However, in recent years, the country’s installed capacity of power generation has grown rapidly. The overall power supply and demand situation is affluent and surplus in some areas. Coupled with the impact of non-fossil energy sources such as wind power, hydropower, and photovoltaics, thermal power units are bound to be in a state of deep peak regulation in the next few years. The annual load rate of units At a low level, the small steam turbine driven by the induced draft fan deviates from the high-efficiency point for a long time, seriously affecting the overall economics of the unit
[0007] 3) For the induced draft fan of the boiler, if the thermal power unit equipped with the steam-driven induced draft fan implements the ultra-clean emission renovation project, the power of the induced draft fan will increase due to the increase of wind and smoke resistance, and the output of the small steam turbine will not be able to meet the maximum power of the induced draft fan. In this case, it is necessary to carry out secondary transformation on small steam turbines, and the resulting investment waste will increase significantly
Method used
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Embodiment 1
[0035] Such as figure 2 As shown, the pure condensing or back pressure small steam turbine 1 is coaxially connected with the motor 6 through the gear box 2 and the clutch 5. The shaft device 3 is coaxially connected with the pump / fan 4, and the motor 6 is connected with the plant power system of the unit through a high-voltage bus.
Embodiment 2
[0037] Such as image 3 As shown, the pure condensing or back pressure small steam turbine 1 is coaxially connected with the pump / fan 4 through the gear box 2 and the clutch 5. The other end is coaxially connected with the motor 6 through a shaft coupling 3 .
[0038] Working process of the present invention:
[0039] When the unit is started, the pump / fan 4 can be directly started by the original motor 6, or the small steam turbine 1 can be driven by the auxiliary steam of the neighboring machine to start the pump / fan 4 to realize the ignition of the boiler.
[0040] As the load of the unit increases, the steam source of the small steam turbine is switched to the local machine after the steam parameters supplied by the machine to the small steam turbine 1 meet the requirements. When the output speed n1 of the small steam turbine 1 decelerated by the gearbox 2 is synchronized with the speed n2 of the motor 6, the clutch 5 realizes the meshing function, and the small steam tu...
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The invention discloses a thermal power plant auxiliary machine steam-electricity dual-power drive and power generation system and method. The system comprises a pump / fan, a small steam turbine, an electromotor, a gear case, a station service system and the like. According to two forms, in the electromotor dual output shaft form, one end of the electromotor is coaxially connected with the pump / fan through a coupling, and the other end of the electromotor is coaxially connected with a clutch and the gear case through the small steam turbine; and in the pump / fan dual output shaft form, one end of the pump / fan is coaxially connected with the electromotor through the coupling, and the other end of the pump / fan is coaxially connected with the clutch and the gear case through the small steam turbine. The electromotor and the station service system are connected through a high-voltage bus. According to the thermal power plant auxiliary machine steam-electricity dual-power drive and power generation system and method, redundancy configuration is not needed for electrically starting the pump / fan, and adjacent machine auxiliary steam is adopted for driving the small steam turbine to start the pump / fan or driving the electromotor to start the pump / fan; and when a unit operates normally, the pump / fan is driven by the small steam turbine, the electromotor is in standby application or is automatically switched into a power generation state, a steam inlet adjusting valve of the small steam turbine can be fully opened during operating in all load segments, and efficient and economical operating is achieved. The beneficial effects of saving the equipment investment, achieving the high pump / fan power source standby application performance, improving the operating economical performance, reducing the station service power consumption rate and the like are achieved.
Description
[0001] 【Technical field】 [0002] The invention belongs to the field of energy saving and consumption reduction in thermal power plants, and relates to a steam-electric dual-power drive and power generation system and method for an auxiliary machine in a thermal power plant. [0003] 【Background technique】 [0004] In recent years, the country has invested heavily in the field of energy conservation and emission reduction in thermal power plants, and has made remarkable achievements. The energy consumption of units and pollutant emissions have decreased year by year. In order to effectively solve the impact of the main power-consuming equipment such as boiler feed water pump and boiler induced draft fan on the factory power system when the current is too large; In order to ensure that the boiler feed water pump and boiler induced draft fan always maintain high efficiency operation under various loads of the unit, some thermal power plants have changed the boiler feed water pump...
Claims
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IPC IPC(8): F01D15/10F04B17/00
CPCF01D15/10F04B17/00
Inventor 吕凯马汀山万超程东涛许朋江兀鹏越
Owner XIAN XIRE ENERGY SAVING TECH