CN215718990U - Power generation system based on back pressure type water feeding pump steam turbine - Google Patents

Power generation system based on back pressure type water feeding pump steam turbine Download PDF

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Publication number
CN215718990U
CN215718990U CN202121187203.8U CN202121187203U CN215718990U CN 215718990 U CN215718990 U CN 215718990U CN 202121187203 U CN202121187203 U CN 202121187203U CN 215718990 U CN215718990 U CN 215718990U
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China
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pressure
power generation
steam
system based
generation system
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CN202121187203.8U
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Inventor
薛朝囡
许朋江
石慧
王妍
吕凯
张建元
邓佳
温婷
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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 power generation system based on a back pressure type water feeding pump steam turbine, which changes the steam inlet of the traditional water pump steam turbine from the steam inlet of a deaerator into reheat steam, improves the steam inlet pressure grade, realizes the purposes of improving the efficiency of the water feeding pump steam turbine, reducing the complexity of the system, reducing the energy consumption of the system and improving the operation economy.

Description

Power generation system based on back pressure type water feeding pump steam turbine
Technical Field
The utility model belongs to the field of thermal power generation, and particularly relates to a power generation system based on a back pressure type water feeding pump steam turbine.
Background
In the 80 and 90 s, small and medium-sized generator sets of 200MW grade are developed vigorously, the feed pumps are driven by motors under the design working conditions, namely the motor feed pumps, and the power development of China is in the stage of short supply and short demand, so that the cost is reduced and the benefits are increased, the benefit is improved, and the loss is sufficient. 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, driven by the benefits of energy conservation and emission reduction, a high-power steam-driven water feed pump set gradually replaces an electric water feed pump set and becomes a standard configuration of a large-scale generator set. However, the design of the steam feed pump set of the medium and small-sized steam turbine is still supported, so that although the grade of the set is developed from 300MW to 600MW, even 1000MW, the steam feed pump turbine still fixedly adopts a condensing steam turbine taking 4-section regenerative steam extraction (namely, deaerator steam inlet) as steam inlet, and it is the key of the application to find a more optimal configuration mode of the steam feed pump turbine.
Disclosure of Invention
The utility model aims to overcome the defects and provides a power generation system based on a back pressure type water feeding pump steam turbine, and a method for driving a water feeding pump by using the back pressure type steam turbine instead of a condensing steam turbine is adopted, so that the complexity of the system is reduced, the energy consumption of the system is reduced, and the operation economy is improved.
In order to achieve the purpose, the utility model comprises a low-pressure cylinder, an intermediate-pressure cylinder and a high-pressure cylinder, wherein the intermediate-pressure cylinder is connected with the low-pressure cylinder and the high-pressure cylinder, the high-pressure cylinder and the intermediate-pressure cylinder are connected with a boiler, the low-pressure cylinder is connected with a generator, a reheating steam pipeline of the boiler is connected with a water-feeding pump turbine, and a steam exhaust pipeline of the water-feeding pump turbine is connected with the low-pressure cylinder.
The water supply pump turbine is a back pressure turbine.
The backheating steam pipeline of the intermediate pressure cylinder is connected with a deaerator, the deaerator is connected with a water feeding pump, and the water feeding pump is connected with a water feeding pump turbine.
The low-pressure cylinder is connected with the condenser, the condenser is connected with the low-pressure heater group, the low-pressure heater group is connected with the deaerator, the deaerator is connected with the water feeding pump, the water feeding pump is connected with the high-pressure heater group, and the high-pressure heater group is connected with the boiler.
The condenser is connected with the low-pressure heater group through a condensate pump.
And a regenerative steam pipeline of the low-pressure cylinder is connected with the front three-stage low-pressure heater of the low-pressure heater group.
And a regenerative steam pipeline of the intermediate pressure cylinder is connected with a final-stage low-pressure heater of the low-pressure heater group and a first-stage high-pressure heater of the high-pressure heater group.
And a regenerative steam pipeline of the high-pressure cylinder is connected with a rear three-stage high-pressure heater of the high-pressure heater group.
Compared with the prior art, the steam inlet of the traditional water pump steam turbine is changed into reheat steam from steam inlet of a deaerator, the steam inlet pressure grade is improved, the purposes of improving the efficiency of the water feed pump steam turbine, reducing the complexity of the system, reducing the energy consumption of the system and improving the operation economy are achieved, the system is wide in applicability, and the steam inlet of the water feed pump steam turbine is reheat steam of a boiler after being modified, and exhaust steam is introduced into a medium-low pressure communicating pipe and does not influence the operation of the original steam turbine body, so that the method is not only suitable for a newly built unit, but also suitable for unit modification.
Drawings
FIG. 1 is a schematic structural view of the present invention;
the system comprises a low-pressure cylinder, a medium-pressure cylinder, a high-pressure cylinder, a boiler, a water-feeding pump turbine, a deaerator, a water-feeding pump, a generator, a condenser, a low-pressure heater group, a high-pressure heater group, a condensate pump 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 boiler is 5, the water-feeding pump turbine is 6, the deaerator is 7, the water-feeding pump is 8, the generator is 9, the condenser is 10, the low-pressure heater group is 11, the high-pressure heater group is 12, and the condensate pump is 12.
Detailed Description
The utility model is further described below with reference to the accompanying drawings.
Referring to fig. 1, the utility model comprises a low pressure cylinder 1, an intermediate pressure cylinder 2 and a high pressure cylinder 3, wherein the intermediate pressure cylinder 2 is connected with the low pressure cylinder 1 and the high pressure cylinder 3, the high pressure cylinder 3 and the intermediate pressure cylinder 2 are connected with a boiler 4, the low pressure cylinder 1 is connected with a generator 8, a reheat steam pipeline of the boiler 4 is connected with a water feed pump turbine 5, and a steam exhaust pipeline of the water feed pump turbine 5 is connected with the low pressure cylinder 1. The feed pump turbine 5 is a back pressure turbine. The backheating steam pipeline of the intermediate pressure cylinder 2 is connected with a deaerator 6, the deaerator 6 is connected with a water feeding pump 7, and the water feeding pump 7 is connected with a water feeding pump turbine 5. The low-pressure cylinder 1 is connected with a condenser 9, the condenser is connected with a low-pressure heater group 10, the low-pressure heater group 10 is connected with a deaerator 6, the deaerator 6 is connected with a water feed pump 7, the water feed pump 7 is connected with a high-pressure heater group 11, and the high-pressure heater group 11 is connected with a boiler 4. The condenser 9 is connected with a low-pressure heater group 10 through a condensate pump 12. The regenerative steam pipeline of the low-pressure cylinder 1 is connected with the front three-stage low-pressure heater of the low-pressure heater group 10. The regenerative steam pipeline of the intermediate pressure cylinder 2 is connected with a final stage low pressure heater of the low pressure heater group 10 and a first stage high pressure heater of the high pressure heater group 11. The regenerative steam pipeline of the high-pressure cylinder 3 is connected with the rear three-stage high-pressure heater of the high-pressure heater group 11.
The utility model changes the water pump steam turbine 5 into a back pressure steam turbine, the exhaust steam of the small steam turbine enters the middle and low pressure communicating pipe and continues to work in the low pressure cylinder, thereby reducing the cold source loss and improving the economy of the unit; on the assumption that the efficiency of the water feeding pump steam turbine is unchanged before and after the transformation and the three-cylinder efficiency of the steam turbine is the same, the heat consumption rate of the steam turbine after the transformation is reduced by 3.6kJ/kWh through calculation, and the coal consumption of the unit for generating electricity is correspondingly reduced by about 0.13 g/kWh.

Claims (8)

1. The utility model provides a power generation system based on back pressure formula feed pump steam turbine, a serial communication port, including low pressure jar (1), intermediate pressure jar (2) and high-pressure jar (3), low pressure jar (1) and high-pressure jar (3) are connected in intermediate pressure jar (2), boiler (4) are connected in high-pressure jar (3) and intermediate pressure jar (2), generator (8) are connected in low pressure jar (1), feed pump steam turbine (5) are connected to the reheat steam line of boiler (4), low pressure jar (1) is connected to the exhaust steam line of feed pump steam turbine (5).
2. A power generation system based on a back pressure feed water pump turbine according to claim 1, characterized in that the feed water pump turbine (5) is a back pressure turbine.
3. The power generation system based on the back pressure type water feed pump steam turbine is characterized in that a backheating steam pipeline of the intermediate pressure cylinder (2) is connected with a deaerator (6), the deaerator (6) is connected with a water feed pump (7), and the water feed pump (7) is connected with a water feed pump steam turbine (5).
4. The power generation system based on the back pressure type water feed pump steam turbine is characterized in that the low pressure cylinder (1) is connected with a condenser (9), the condenser is connected with a low pressure heater group (10), the low pressure heater group (10) is connected with a deaerator (6), the deaerator (6) is connected with a water feed pump (7), the water feed pump (7) is connected with a high pressure heater group (11), and the high pressure heater group (11) is connected with a boiler (4).
5. A power generation system based on a back pressure feed pump turbine according to claim 4 characterized in that the condenser (9) is connected to the low pressure heater bank (10) by a condensate pump (12).
6. A power generation system based on a back pressure feed water pump turbine according to claim 4, characterized in that the regenerative steam line of the low pressure cylinder (1) is connected with the first three stages of low pressure heaters of the low pressure heater group (10).
7. A power generation system based on a back pressure feed water pump turbine according to claim 4, characterized in that the regenerative steam line of the intermediate pressure cylinder (2) connects the last stage low pressure heater of the low pressure heater group (10) and the first stage high pressure heater of the high pressure heater group (11).
8. A power generation system based on a back pressure feed water pump turbine according to claim 4, characterized in that the regenerative steam line of the high pressure cylinder (3) is connected to the last three high pressure heaters of the high pressure heater bank (11).
CN202121187203.8U 2021-05-28 2021-05-28 Power generation system based on back pressure type water feeding pump steam turbine Active CN215718990U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202121187203.8U CN215718990U (en) 2021-05-28 2021-05-28 Power generation system based on back pressure type water feeding pump steam turbine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121187203.8U CN215718990U (en) 2021-05-28 2021-05-28 Power generation system based on back pressure type water feeding pump steam turbine

Publications (1)

Publication Number Publication Date
CN215718990U true CN215718990U (en) 2022-02-01

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ID=80033320

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202121187203.8U Active CN215718990U (en) 2021-05-28 2021-05-28 Power generation system based on back pressure type water feeding pump steam turbine

Country Status (1)

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CN (1) CN215718990U (en)

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