CN214403686U - System adopting five-section steam extraction as steam source of steam turbine of water feeding pump - Google Patents

System adopting five-section steam extraction as steam source of steam turbine of water feeding pump Download PDF

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Publication number
CN214403686U
CN214403686U CN202120234264.9U CN202120234264U CN214403686U CN 214403686 U CN214403686 U CN 214403686U CN 202120234264 U CN202120234264 U CN 202120234264U CN 214403686 U CN214403686 U CN 214403686U
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China
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steam
steam turbine
pump
turbine
jar
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CN202120234264.9U
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Chinese (zh)
Inventor
薛朝囡
许朋江
石慧
王伟
居文平
谷伟伟
曾立飞
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Xian Thermal Power Research Institute Co Ltd
Xian Xire Energy Saving Technology Co Ltd
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Xian Thermal Power Research Institute Co Ltd
Xian Xire Energy Saving Technology Co Ltd
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Abstract

The utility model discloses a system adopting five-section steam extraction as a steam source of a water feeding pump steam turbine, which takes the five-section steam extraction as a main air source for the water feeding pump steam turbine, places a steam section with higher work-doing capacity on a steam turbine middle pressure cylinder with higher efficiency, reduces the heat consumption rate of the steam turbine, improves the economical efficiency of the system, and reduces the heat consumption rate of the steam turbine by 8-10 kJ/kWh after optimization; the steam inlet pressure of the pump steam turbine is reduced, the flow is increased, the steam inlet volume flow is increased, the steam leakage loss of the blade top of the pump steam turbine can be reduced, and the operation efficiency of the pump steam turbine is improved; the utility model discloses a to turbo generator set feed pump steam turbine steam source optimization, reach and improve feed pump steam turbine efficiency, the effect of low system energy consumption, improvement operation economy.

Description

System adopting five-section steam extraction as steam source of steam turbine of water feeding pump
Technical Field
The utility model belongs to the thermal power field, concretely relates to system that adopts five sections to take out vapour as water-feeding pump steam turbine steam sources.
Background
In the vigorous development period of small and medium-sized generator sets with the 200MW grade, the water feeding pump is driven by the motor under the design working condition, namely the motor-driven water feeding pump, the power development of China is in the stage of short supply and short demand, and the electric enterprises are improved in cost reduction and benefit increase, benefit improvement and excess of loss. An effective technical improvement project is to change an electric water-feeding pump into a steam water-feeding pump, and through comparative research: if the large-scale unit adopts the electric water feeding pump, the power consumption of the large-scale unit is about 50% of the factory power of the whole plant, the factory power can be reduced by adopting the steam water feeding pump, and the power supply amount is increased by 3-4%. Although the method is not energy-saving, the power quantity of the power grid is increased, and the economic benefit of the power plant is increased, namely the economic benefit is achieved, and the energy-saving benefit is not achieved.
In recent years, with the increasingly strict national requirements on energy conservation and environmental protection in the chemical and energy fields and the pursuit of more economic benefits of more and more enterprises in a steam energy conservation and emission reduction mode, the high-power steam-driven water feed pump set gradually replaces an electric water feed pump set and becomes the standard configuration of a large-scale generator set.
However, the steam-driven feed pump group who holds in middle-size and small-size steam turbine has also left the dark era brand, considers big steam extraction interval not to arrange well, fixed manufacturing plant design module scheduling problem in the design at that time for although the grade of unit has developed from 300MW to 600MW, 1000MW even, but steam-driven feed pump's steam source is still fixed 4 sections of adoption backheat steam extractions (being the oxygen-eliminating device admission), it is to look for more excellent steam source, reduce system's energy consumption the utility model discloses a key.
Disclosure of Invention
An object of the utility model is to overcome the aforesaid not enough, provide a system that adopts five sections to take out steam as water-feeding pump steam turbine steam sources, cross to turbo generator set water-feeding pump steam turbine steam sources optimization, improve water-feeding pump steam turbine efficiency to reduce system's energy consumption improves the operation economic nature.
In order to achieve the purpose, the utility model discloses a low pressure jar, the intermediate pressure jar is connected to the low pressure jar, the high pressure jar is connected to the intermediate pressure jar, the condenser is connected to the low pressure jar, a plurality of low pressure feed water heaters are connected to the condenser, the oxygen-eliminating device is connected to the last low pressure feed water heater, a plurality of high pressure feed water heaters are connected to the oxygen-eliminating device, the boiler is connected to the last high pressure feed water heater, the high pressure jar is connected to the boiler, the oxygen-eliminating device is connected to the intermediate pressure jar, the water-feeding pump steam turbine is connected to five sections steam extractions of low pressure jar, condenser and first high pressure feed water heater are connected to the water-feeding pump steam turbine.
The condenser is connected with the primary low-pressure heater through a condensate pump, the deaerator is connected with the primary high-pressure heater through a water supply pump, and the water supply pump is connected with a water supply pump turbine.
And sending the regenerative steam of the low-pressure cylinder into the low-pressure heater.
The heat supply steam of the intermediate pressure cylinder is sent into the primary high pressure heater.
And the heat supply steam of the high-pressure cylinder is sent into the second-stage high-pressure heater and the third-stage high-pressure heater.
The low-pressure cylinder is connected with a generator.
Compared with the prior art, the utility model discloses regard five sections to draw the steam as the main power supply of water-feeding pump steam turbine, put the steam section of higher working capacity on the steam turbine intermediate pressure cylinder that efficiency is higher, reduce steam turbine heat rate, improve system economy, the steam turbine heat rate after optimizing reduces 8 ~ 10 kJ/kWh; the steam inlet pressure of the pump steam turbine is reduced, the flow is increased, the steam inlet volume flow is increased, the steam leakage loss of the blade top of the pump steam turbine can be reduced, and the operation efficiency of the pump steam turbine is improved; the utility model discloses a to turbo generator set feed pump steam turbine steam source optimization, reach and improve feed pump steam turbine efficiency, the effect of low system energy consumption, improvement operation economy.
Drawings
FIG. 1 is a system diagram of the present invention;
FIG. 2 is a graph of steam extraction stage versus heat rate increase;
the system comprises a low-pressure cylinder, a medium-pressure cylinder, a high-pressure cylinder, a condenser, a low-pressure heater, a deaerator, a high-pressure heater, a boiler, a water supply pump turbine, a condensate pump, a water supply pump, a generator and a steam generator, wherein the low-pressure cylinder is 1, the low-pressure cylinder is 2, the medium-pressure cylinder is 3, the high-pressure cylinder is 4, the condenser is 5, the low-pressure heater is 6, the deaerator is 7, the high-pressure heater is 8, the boiler is 9, the water supply pump turbine is 10, the condensate pump is 11, the water supply pump is 12.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1, the utility model discloses a low pressure jar 1, low pressure jar 1 is connected intermediate pressure jar 2 and generator 12, intermediate pressure jar 2 is connected high pressure jar 3, low pressure jar 1 is connected condenser 4, condenser 4 is connected a plurality of low pressure feed water heater 5, final stage low pressure feed water heater connects oxygen-eliminating device 6, oxygen-eliminating device 6 is connected a plurality of high pressure feed water heater 7, final stage high pressure feed water heater connects boiler 8, boiler 8 is connected high pressure jar 3, intermediate pressure jar 2 is connected oxygen-eliminating device 6, five sections of low pressure jar 1 are taken out the vapour and are connected feed pump steam turbine 9, change the vapour source into the intermediate pressure jar and arrange the vapour, feed pump steam turbine 9 is connected condenser 4 and primary high pressure feed water heater. The condenser 4 is connected with a primary low-pressure heater through a condensate pump 10, the deaerator 6 is connected with a primary high-pressure heater through a water feed pump 11, and the water feed pump 11 is connected with a water feed pump turbine 9.
The reheated steam of the low pressure cylinder 1 is fed into the low pressure heater 5. The heating steam of the intermediate pressure cylinder 2 is sent to the primary high pressure heater 7. The heating steam of the high pressure cylinder 3 is sent into the second stage high pressure heater and the third stage high pressure heater.
Referring to FIG. 2, it is calculated that the 600MW unit can reduce the heat rate of the turbine by about 8.2kJ/kWh by using five-stage extraction steam, and increase the heat rate of the turbine by about 6.5kJ/kWh by using three-stage extraction steam as a steam source of a feed pump turbine.
The steam source selection mode is not only suitable for unit transformation, but also suitable for newly-built units, namely the newly-built unit selects the first-stage steam extraction behind the deaerator to be the steam source of the water feeding pump turbine, and when the unit is transformed, the water feeding pump turbine, namely the steam extraction pipeline, needs to be transformed in a matched mode, but the spare steam source of the water feeding pump turbine does not need to be adjusted.

Claims (6)

1. The utility model provides a system for adopt five sections to take out steam as feed pump steam turbine steam source, a serial communication port, including low pressure jar (1), intermediate pressure jar (2) is connected in low pressure jar (1), high pressure jar (3) is connected in intermediate pressure jar (2), condenser (4) is connected in low pressure jar (1), a plurality of low pressure heater (5) are connected in condenser (4), last low pressure heater connects deaerator (6), a plurality of high pressure heater (7) are connected in deaerator (6), last high pressure heater connects boiler (8), high pressure jar (3) are connected in boiler (8), deaerator (6) are connected in intermediate pressure jar (2), five sections of low pressure jar (1) are taken out steam and are connected feed pump steam turbine (9), feed pump steam turbine (9) are connected condenser (4) and first high pressure heater.
2. The system adopting the five-stage steam extraction as the steam source of the water feeding pump turbine according to claim 1, wherein the condenser (4) is connected with the first-stage low-pressure heater through a condensate pump (10), the deaerator (6) is connected with the first-stage high-pressure heater through a water feeding pump (11), and the water feeding pump (11) is connected with the water feeding pump turbine (9).
3. A system using five-stage extraction as steam source for a feedwater pump turbine according to claim 1, characterized in that the regenerated steam from the low pressure cylinder (1) is fed to the low pressure heater (5).
4. A system using a five-stage extraction as a steam source for a feedwater pump turbine according to claim 1, characterized in that the supply steam of the intermediate pressure cylinder (2) is fed to the primary high pressure heater (7).
5. A system using five-stage extraction as steam source for a feedwater pump turbine according to claim 1, characterized in that the supply steam of the high pressure cylinder (3) is fed to the second stage high pressure heater and the third stage high pressure heater.
6. A system using five-stage extraction as steam source for a feedwater pump turbine according to claim 1, characterized in that the low pressure cylinder (1) is connected to a generator (12).
CN202120234264.9U 2021-01-27 2021-01-27 System adopting five-section steam extraction as steam source of steam turbine of water feeding pump Active CN214403686U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202120234264.9U CN214403686U (en) 2021-01-27 2021-01-27 System adopting five-section steam extraction as steam source of steam turbine of water feeding pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202120234264.9U CN214403686U (en) 2021-01-27 2021-01-27 System adopting five-section steam extraction as steam source of steam turbine of water feeding pump

Publications (1)

Publication Number Publication Date
CN214403686U true CN214403686U (en) 2021-10-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202120234264.9U Active CN214403686U (en) 2021-01-27 2021-01-27 System adopting five-section steam extraction as steam source of steam turbine of water feeding pump

Country Status (1)

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CN (1) CN214403686U (en)

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