CN214247438U - System adopting medium-pressure cylinder exhaust steam as steam source of water feeding pump steam turbine - Google Patents

System adopting medium-pressure cylinder exhaust steam as steam source of water feeding pump steam turbine Download PDF

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Publication number
CN214247438U
CN214247438U CN202120231820.7U CN202120231820U CN214247438U CN 214247438 U CN214247438 U CN 214247438U CN 202120231820 U CN202120231820 U CN 202120231820U CN 214247438 U CN214247438 U CN 214247438U
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China
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steam
pressure cylinder
pump
steam turbine
turbine
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CN202120231820.7U
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Chinese (zh)
Inventor
薛朝囡
许朋江
石慧
王伟
居文平
谷伟伟
高庆
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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 the steam discharged by a medium pressure cylinder as the steam source of a water feeding pump steam turbine, which takes the steam discharged by the medium pressure cylinder as a main gas source to feed the water feeding pump steam turbine, puts the steam section with higher work-doing capacity into a steam turbine medium pressure cylinder with higher efficiency to do work, 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 medium-pressure cylinder exhaust steam as steam source of water feeding pump steam turbine
Technical Field
The utility model belongs to the thermal power field, concretely relates to system for adopt intermediate pressure jar exhaust as water-feeding pump steam turbine steam source.
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 an adopt the system of intermediate pressure jar steam extraction as water supply pump steam turbine steam source, cross to turbo generator set water supply pump steam turbine steam source optimization, improve water supply 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 heater are connected to the condenser, the oxygen-eliminating device is connected to the last low pressure heater, a plurality of high pressure heater are connected to the oxygen-eliminating device, the boiler is connected to the last high pressure heater, the high pressure jar is connected to the boiler, the oxygen-eliminating device is connected to the intermediate pressure jar, the steam extraction of intermediate pressure jar is connected and is given water the pump steam turbine, give water the pump steam turbine and connect condenser and first high pressure heater, the generator is connected to the low pressure jar.
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 front three-stage low pressure heater.
The heat supply steam of the intermediate pressure cylinder is sent into a final-stage low-pressure heater and a deaerator.
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.
Compared with the prior art, the utility model discloses regard the discharge of intermediate pressure cylinder 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 connects a plurality of low pressure feed water heaters 5, the oxygen-eliminating device 6 is connected to the last low pressure feed water heater, a plurality of high pressure feed water heaters 7 are connected to the oxygen-eliminating device 6, last high pressure feed water heater connects boiler 8, boiler 8 connects high pressure jar 3, intermediate pressure jar 2 is connected oxygen-eliminating device 6, water-feeding pump turbine 9 is connected to the steam extraction of intermediate pressure jar 2, water-feeding pump turbine 9 connects condenser 4 and first 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 regenerative steam of the low pressure cylinder 1 is sent into the front three-stage low pressure heater 5. The heat supply steam of the intermediate pressure cylinder 2 is sent into a final-stage low-pressure heater and a deaerator 6. 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 was calculated that the 600MW unit used the intermediate cylinder discharge as the feedwater pump turbine source to reduce the turbine heat rate by approximately 8.2kJ/kWh and the three-stage extraction as the feedwater pump turbine source to increase the turbine heat rate by approximately 6.5 kJ/kWh.
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, when the unit is transformed, the steam extraction pipeline of the water feeding pump turbine needs to be transformed in a matched mode, and the spare steam source of the water feeding pump turbine does not need to be adjusted.

Claims (6)

1. The utility model provides an adopt system of intermediate pressure cylinder exhaust as feed pump steam turbine steam source, a serial communication port, including low pressure cylinder (1), intermediate pressure cylinder (2) is connected in low pressure cylinder (1), high pressure cylinder (3) is connected in intermediate pressure cylinder (2), condenser (4) is connected in low pressure cylinder (1), a plurality of low pressure heater (5) are connected in condenser (4), last low pressure heater connects deaerator (6), a plurality of grades of high pressure heater (7) are connected in deaerator (6), last high pressure heater connects boiler (8), high pressure cylinder (3) are connected in boiler (8), deaerator (6) are connected in intermediate pressure cylinder (2), feed pump steam turbine (9) is connected to the exhaust of intermediate pressure cylinder (2), feed pump steam turbine (9) are connected condenser (4) and first high pressure heater.
2. The system adopting the medium pressure cylinder exhaust steam as the steam source of the water feeding pump turbine according to claim 1, wherein the condenser (4) is connected with the primary low-pressure heater through a condensate pump (10), the deaerator (6) is connected with the primary 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 intermediate pressure cylinder exhaust steam as a steam source of a steam turbine of a feed water pump according to claim 1, characterized in that the regenerative steam of the low pressure cylinder (1) is fed into the low pressure heater (5) of the previous three stages.
4. A system using intermediate pressure cylinder exhaust steam as a steam source of a feed water pump turbine according to claim 1, characterized in that the supply steam of the intermediate pressure cylinder (2) is fed into the final stage low pressure heater and deaerator (6).
5. A system using intermediate pressure cylinder exhaust steam as a steam source for a steam turbine of a feedwater pump 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 medium pressure cylinder exhaust steam as a 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).
CN202120231820.7U 2021-01-27 2021-01-27 System adopting medium-pressure cylinder exhaust steam as steam source of water feeding pump steam turbine Active CN214247438U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202120231820.7U CN214247438U (en) 2021-01-27 2021-01-27 System adopting medium-pressure cylinder exhaust steam as steam source of water feeding pump steam turbine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202120231820.7U CN214247438U (en) 2021-01-27 2021-01-27 System adopting medium-pressure cylinder exhaust steam as steam source of water feeding pump steam turbine

Publications (1)

Publication Number Publication Date
CN214247438U true CN214247438U (en) 2021-09-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202120231820.7U Active CN214247438U (en) 2021-01-27 2021-01-27 System adopting medium-pressure cylinder exhaust steam as steam source of water feeding pump steam turbine

Country Status (1)

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CN (1) CN214247438U (en)

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