CN211924258U - Energy-saving and efficient steam seal steam supply system of steam turbine - Google Patents
Energy-saving and efficient steam seal steam supply system of steam turbine Download PDFInfo
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- CN211924258U CN211924258U CN202020705672.3U CN202020705672U CN211924258U CN 211924258 U CN211924258 U CN 211924258U CN 202020705672 U CN202020705672 U CN 202020705672U CN 211924258 U CN211924258 U CN 211924258U
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Abstract
The utility model provides an energy-conserving high-efficient steam turbine vapor seal supplies vapour system, including high-intermediate pressure jar and low pressure jar, be equipped with high-pressure bearing seal between bearing seal and the low pressure jar before the high pressure and leak vapour moisturizing pipe, the bearing seal is equipped with two high-pressure bearing seal and leaks vapour equalizer and is connected with the pressure-equalizing box before the high pressure, the bearing seal is equipped with a middling pressure bearing seal and leaks vapour equalizer and be connected with the pressure-equalizing box after the middling pressure, respectively through a low-pressure bearing seal steam supply union coupling between pressure-equalizing box and the bearing seal before the low pressure and the bearing seal after the low pressure, high-pressure bearing seal leaks vapour moisturizing pipe one side and is connected with the moisturizing pipe, the pressure-equalizing box is connected with hot start-up air source pipeline and cold. The utility model discloses a steam supply system reduces the vapor leakage of vapor seal, has reduced pressure equalizing box pressure, has reduced supplementary steam and has supplied the shaft to seal the volume of sending vapor, has improved unit stability to the whole thermal efficiency of unit combined cycle increases, and the running cost is low.
Description
Technical Field
The utility model relates to a steam turbine equipment technical field, in particular to energy-conserving high-efficient steam turbine vapor seal supplies vapour system.
Background
A steam turbine is an external combustion rotary machine that can convert steam heat energy into mechanical work. After steam from a boiler enters a steam turbine, the steam passes through a series of annularly arranged nozzles and movable blades in sequence, and heat energy of the steam is converted into mechanical energy for rotating a rotor of the steam turbine. And a shaft seal is arranged at the joint of the rotor spindle and the cylinder and sealed in a steam seal mode.
However, the existing steam seal system has the condition of air leakage, especially the steam leakage of the steam seal after high pressure and the steam seal after medium pressure is serious, on one hand, the steam leakage is caused to enter the front bearing box and the middle bearing box, the oil water content of the lubricating oil box is improved, on the other hand, the system can not meet the steam sending of the low pressure steam seal, only the pressure of the pressure equalizing box can be adjusted, the pressure is reduced, the vacuum degree is reduced, if the steam leakage of the steam seal at the high and medium pressure end is further improved, but the pressure of the pressure equalizing box can not meet the low pressure steam seal, the steam supply of the low pressure cylinder steam seal can be met only by fully opening the valve for assisting the steam supply and steam sending of the steam seal, the steam supply amount of the auxiliary steam supply and shaft seal is improved, the stability of the.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve prior art's problem, provide an energy-conserving high-efficient steam turbine vapor seal steam supply system, reduce the vapor seal and leak, avoid leaking vapour to get into the bearing box and result in the incasement oil matter water content to improve, reduced the pressure equalizing box pressure, reduced supplementary steam and supplied the shaft seal to send the vapour volume, improved unit stability.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the steam seal steam supply system of the energy-saving high-efficiency steam turbine comprises a high-medium pressure cylinder and a low-pressure cylinder, wherein two ends of the high-medium pressure cylinder are respectively provided with a high-pressure front shaft seal and a medium-pressure rear shaft seal, two ends of the low-pressure cylinder are respectively provided with a low-pressure front shaft seal and a low-pressure rear shaft seal, a high-pressure shaft seal steam leakage steam supply pipe is arranged between the high-pressure front shaft seal and the low-pressure cylinder, an electric valve is arranged on the high-pressure shaft seal steam leakage steam supply pipe, the high-pressure front shaft seal is provided with two high-pressure shaft seal steam leakage equalizing pipes connected with a pressure equalizing box, the medium-pressure rear shaft seal is provided with a medium-pressure shaft seal steam leakage equalizing pipe connected with a pressure equalizing box, manual regulating valves are respectively arranged on the high-pressure shaft seal steam leakage equalizing pipe and the medium-pressure shaft seal steam leakage equalizing pipe, the pressure equalizing box is connected. The high-pressure front shaft seal and the low-pressure cylinder are connected through the steam leakage and steam supplement pipe, so that on one hand, the steam leakage condition of the high-pressure shaft seal is relieved, the steam leakage is reduced, the steam leakage enters the bearing box, on the other hand, the low-pressure steam seal steam delivery is met, and the stable pressure of the pressure equalizing box is ensured by the pipeline connection mode of the high-pressure middle-pressure cylinder, the low-pressure cylinder and the pressure equalizing box.
Preferably, one side of the high-pressure shaft seal steam leakage and supplement pipe is connected with a steam supplement pipe, the steam supplement pipe is connected with a low-pressure steam supplement source, and a low-pressure steam supplement regulating valve is arranged on the steam supplement pipe. The auxiliary steam supply shaft seal steam supply device is used for supplying steam to the auxiliary steam supply shaft seal when the pressure of the pressure equalizing box cannot meet the low-pressure steam seal.
Preferably, the system is provided with a hot-state starting air source pipeline and a cold-state starting air source pipeline, wherein the hot-state starting air source pipeline sequentially comprises a hot-state starting air source, a manual regulating valve, a flow control valve and a manual regulating valve, the cold-state starting air source pipeline sequentially comprises a cold-state starting air source, a manual regulating valve, a flow control valve and a manual regulating valve, and the hot-state starting air source pipeline and the cold-state starting air source pipeline are combined into one pipeline and are connected with the pressure equalizing box through the desuperheater.
Preferably, an air source branch pipe is connected between the steam supplementing pipe and the cold starting air source pipeline, and a check valve is arranged on the air source branch pipe. The gas source branch pipe is connected with a low-pressure steam compensating regulating valve downstream pipeline on the steam compensating pipe and a pipeline between the cold starting gas source and the manual regulating valve on the cold starting gas source pipeline, and the check valve enables the steam in the pipe to be conveyed from the steam compensating pipe to the cold starting gas source pipeline in a one-way mode.
Preferably, the high-pressure shaft seal steam leakage pressure equalizing pipe and the medium-pressure shaft seal steam leakage pressure equalizing pipe are respectively provided with a Y-shaped filter screen, and the Y-shaped filter screen is connected with a non-pressure water drain main pipe. The Y-shaped filter screen is used for filtering and removing impurities in the steam so as to protect the normal use of the valve and the equipment, and the impurities are discharged to the non-pressure water discharge main pipe from the filtering outlet.
Preferably, the low-pressure shaft seal steam supply pipe is provided with a Y-shaped filter screen, and the Y-shaped filter screen is connected with the non-pressure water discharge main pipe.
Preferably, a desuperheater is connected between the stop valve on the low-pressure shaft seal steam supply pipe and the Y-shaped filter screen through a pipeline and is used for controlling and maintaining the temperature of the superheated steam.
Preferably, the pressure equalizing box is connected with a condenser pipeline, and the condenser pipeline sequentially comprises a manual regulating valve, a flow control valve, a manual regulating valve and a condenser.
Preferably, the hot starting air source pipeline, the cold starting air source pipeline and the condenser pipeline are respectively provided with a bypass at two sides of the two manual regulating valves, and the bypasses are provided with electric valves and can be used for shunting and relieving pipeline pressure and overhauling pipelines.
Preferably, the high-pressure front shaft seal, the medium-pressure rear shaft seal, the low-pressure front shaft seal and the low-pressure rear shaft seal are respectively provided with a shaft seal shaft exhaust pipe, and the shaft seal shaft exhaust pipes are combined into a main pipe which is sequentially provided with a flow regulating valve, a shaft exhaust fan and a check valve. Further lightening the steam leakage condition of the high-pressure shaft seal and reducing the steam leakage entering the bearing box.
Preferably, a steam seal heater is arranged on a main pipe of the shaft seal shaft exhaust pipe. The gland heater recovers shaft seal leakage steam and utilizes the heat of the shaft seal leakage steam to heat condensed water, so that energy loss is reduced, and the heat efficiency of the unit is improved.
Preferably, the flow control valves, the shaft suction fans and the check valves are connected in parallel in two groups.
Preferably, one side of the main pipe of the shaft seal shaft exhaust pipe is provided with an exhaust pipe bypass pipe, and the exhaust pipe bypass pipe is provided with a stop valve, so that the pressure of the main pipe can be relieved.
Preferably, a spring-type safety valve is arranged on the pressure equalizing box. The pressure equalizing box is used for generating high pressure after the pressure of the pressure equalizing box is abnormal, so that the spring pressure of the safety valve can be overcome, the locking device is pushed open to form a pressure relief channel, the high pressure is relieved, and the safety of equipment is ensured.
The utility model has the advantages that: the utility model discloses a steam supply system reduces the vapor leakage of vapor seal, avoids the vapor leakage to get into the bearing box and leads to the incasement oil matter water content to improve, has reduced the pressure tank pressure of uniform pressure, has reduced supplementary steam and has supplied the shaft to seal the volume of sending vapor, has improved unit stability to the whole thermal efficiency of unit combined cycle increases, and the running cost is low.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
The main elements in the figures are symbolically illustrated: 1. high-pressure shaft seal steam leakage and steam compensation pipe, 2, an electric valve, 3, a high-pressure shaft seal steam leakage and steam compensation pipe, 4, a pressure compensation box, 5, a medium-pressure shaft seal steam leakage and steam compensation pipe, 6, a manual regulating valve, 7, a low-pressure shaft seal steam supply pipe, 8, a spring type safety valve, 9, a stop valve, 10, a Y-shaped filter screen, 11, a non-pressure water drainage mother pipe, 12, a desuperheater, 13, a steam compensation pipe, 14, a low-pressure steam compensation source, 15, a low-pressure steam compensation regulating valve, 16, a shaft seal air extraction pipe, 17, a shaft exhaust fan, 18, a flow regulating valve, 19, a check valve, 20, an air extraction pipe, 21, a hot-state starting air source, 22, a flow control valve, 23, a cold-state starting air source, 24, an air source branch pipe, 25, a check valve, 26, a condenser, 27, a steam seal heater, 100, a high-medium-pressure cylinder, 101, a high-, And (4) sealing a low-pressure rear shaft.
Detailed Description
The invention will be further explained by means of the following description and the attached drawings.
The first embodiment is as follows: as shown in fig. 1, an energy-saving and efficient steam turbine steam seal steam supply system includes a high and medium pressure cylinder 100 and a low pressure cylinder 200, where two ends of the high and medium pressure cylinder 100 are respectively a high pressure front shaft seal 101 and a medium pressure rear shaft seal 102, and two ends of the low pressure cylinder 200 are respectively a low pressure front shaft seal 201 and a low pressure rear shaft seal 202. A high-pressure shaft seal steam leakage and supplement pipe 1 is arranged between the high-pressure front shaft seal 101 and the low-pressure cylinder 200, an electric valve 2 is arranged on the high-pressure shaft seal steam leakage and supplement pipe 1, a steam supplement pipe 13 is connected to one side of the high-pressure shaft seal steam leakage and supplement pipe 1, the steam supplement pipe 13 is connected with a low-pressure steam supplement source 14, and a low-pressure steam supplement regulating valve 15 is arranged on the steam supplement pipe 13.
The high-pressure front shaft seal 101 is provided with two high-pressure shaft seal steam leakage equalizing pipes 3 connected with a pressure equalizing box 4, the medium-pressure rear shaft seal 102 is provided with a medium-pressure shaft seal steam leakage equalizing pipe 5 connected with the pressure equalizing box 4, the high-pressure shaft seal steam leakage equalizing pipe 3 and the medium-pressure shaft seal steam leakage equalizing pipe 5 are respectively provided with a manual regulating valve 6, the pressure equalizing box 4 is provided with a spring type safety valve 8 and is connected with the low-pressure front shaft seal 201 and the low-pressure rear shaft seal 202 at two ends of the low-pressure cylinder 200 through a low-pressure shaft seal steam supply pipe 7, and the low-pressure shaft seal steam supply pipe 7 is sequentially provided with an electric valve. The high-pressure shaft seal steam leakage pressure equalizing pipe 3, the medium-pressure shaft seal steam leakage pressure equalizing pipe 5 and the low-pressure shaft seal steam supply pipe 7 are respectively provided with a Y-shaped filter screen 10, and the Y-shaped filter screen 10 is connected with a non-pressure water discharge main pipe 11. Wherein, a temperature reducer 12 is connected between the stop valve 9 and the Y-shaped filter screen 10 on the low-pressure shaft seal steam supply pipe 7 through a pipeline.
In addition, the system is also provided with a hot-state starting air source pipeline and a cold-state starting air source pipeline, the hot-state starting air source pipeline sequentially comprises a hot-state starting air source 21, a manual regulating valve 6, a flow control valve 22 and a manual regulating valve 6, the cold-state starting air source pipeline sequentially comprises a cold-state starting air source 23, a manual regulating valve 6, a flow control valve 22 and a manual regulating valve 6, and the hot-state starting air source pipeline and the cold-state starting air source pipeline are combined into one pipeline and are connected with the pressure equalizing box 4 through the desuperheater 12; the pressure equalizing box 4 is connected with a condenser pipeline which sequentially comprises a manual regulating valve 6, a flow control valve 22, a manual regulating valve 6 and a condenser 26. Wherein, the hot starting air source pipeline, the cold starting air source pipeline and the condenser pipeline are respectively provided with a bypass at two sides of the two manual regulating valves 6, and the bypasses are provided with electric valves 2.
It should be noted that an air source branch pipe 24 is connected between the steam supply pipe 13 and the cold-state starting air source pipeline, and a check valve 25 is arranged on the air source branch pipe 24.
Example two: referring to fig. 1, on the basis of the first embodiment, the high-pressure front shaft seal 101, the medium-pressure rear shaft seal 102, the low-pressure front shaft seal 201, and the low-pressure rear shaft seal 202 are respectively provided with a shaft seal shaft exhaust pipe 16, and the shaft seal shaft exhaust pipe 16 is a main pipe on which a steam seal heater 27, a flow regulating valve 18, a shaft exhaust fan 17, and a check valve 19 are sequentially arranged. Wherein, the flow control valve 18, the shaft exhaust fan 17 and the check valve 19 are connected in parallel in two groups.
In addition, an exhaust duct bypass pipe 20 is provided on the main pipe side of the shaft seal shaft exhaust duct 16, and a stop valve 9 is provided on the exhaust duct bypass pipe 20.
The above description is only the specific embodiments of the present invention, but the structural features of the present invention are not limited thereto, the present invention can be used in similar products, and any person skilled in the art is in the field of the present invention, and all the changes or modifications made are covered by the claims of the present invention.
Claims (10)
1. The utility model provides an energy-conserving high-efficient steam turbine steam seal supplies vapour system, includes high intermediate pressure jar (100), low pressure jar (200) and pressure-equalizing box (4), and high intermediate pressure jar (100) both ends are high pressure front shaft seal (101) and well pressure rear shaft seal (102) respectively, and low pressure jar (200) both ends are low pressure front shaft seal (201) and low pressure rear shaft seal (202) respectively, its characterized in that: a high-pressure shaft seal steam leakage and supplement pipe (1) is arranged between the high-pressure front shaft seal (101) and the low-pressure cylinder (200), an electric valve (2) is arranged on the high-pressure shaft seal steam leakage and supplement pipe (1), the high-pressure front shaft seal (101) is provided with two high-pressure shaft seal steam leakage pressure equalizing pipes (3) which are connected with a pressure equalizing box (4), the medium-pressure rear shaft seal (102) is provided with a medium-pressure shaft seal steam leakage pressure equalizing pipe (5) which is connected with the pressure equalizing box (4), the high-pressure shaft seal steam leakage pressure equalizing pipe (3) and the medium-pressure shaft seal steam leakage pressure equalizing pipe (5) are respectively provided with a manual regulating valve (6), the pressure equalizing box (4) is connected with the low-pressure front shaft seal (201) and the low-pressure rear shaft seal (202) at two ends of the low-pressure cylinder (200) through a low-pressure shaft seal steam supply pipe (7), and the low-pressure;
one side of the high-pressure shaft seal steam leakage and supplement pipe (1) is connected with a steam supplement pipe (13), the steam supplement pipe (13) is connected with a low-pressure steam supplement source (14), a low-pressure steam supplement regulating valve (15) is arranged on the steam supplement pipe (13), a hot-state starting air source pipeline and a cold-state starting air source pipeline are arranged, the hot-state starting air source pipeline sequentially comprises a hot-state starting air source (21), a manual regulating valve (6), a flow control valve (22) and the manual regulating valve (6), the cold-state starting air source pipeline sequentially comprises a cold-state starting air source (23), the manual regulating valve (6), the flow control valve (22) and the manual regulating valve (6), and the hot-state starting air source pipeline and the cold-state starting air source pipeline are combined into one path and are connected with the pressure equalizing;
and an air source branch pipe (24) is connected between the steam supplementing pipe (13) and the cold-state starting air source pipeline, and a check valve (25) is arranged on the air source branch pipe (24).
2. The energy-saving and efficient steam turbine gland seal steam supply system according to claim 1, characterized in that: the high-pressure shaft seal steam leakage pressure equalizing pipe (3) and the medium-pressure shaft seal steam leakage pressure equalizing pipe (5) are respectively provided with a Y-shaped filter screen (10), the Y-shaped filter screen (10) is connected with a non-pressure water drain main pipe (11), the low-pressure shaft seal steam supply pipe (7) is provided with a Y-shaped filter screen (10), and the Y-shaped filter screen (10) is connected with the non-pressure water drain main pipe (11).
3. The energy-saving and efficient steam turbine gland seal steam supply system according to claim 2, characterized in that: a desuperheater (12) is connected between the stop valve (9) on the low-pressure shaft seal steam supply pipe (7) and the Y-shaped filter screen (10) through a pipeline.
4. The energy-saving and efficient steam turbine gland seal steam supply system according to claim 1, characterized in that: the pressure equalizing box (4) is connected with a condenser pipeline, and the condenser pipeline sequentially comprises a manual regulating valve (6), a flow control valve (22), the manual regulating valve (6) and a condenser (26).
5. The energy-saving and efficient steam turbine gland seal steam supply system according to claim 4, characterized in that: and bypasses are respectively arranged on the two sides of the two manual regulating valves (6) on the hot-state starting air source pipeline, the cold-state starting air source pipeline and the condenser pipeline, and electric valves (2) are arranged on the bypasses.
6. The energy-saving high-efficiency steam turbine gland seal steam supply system according to any one of claims 1 to 5, characterized in that: the high-pressure front shaft seal (101), the medium-pressure rear shaft seal (102), the low-pressure front shaft seal (201) and the low-pressure rear shaft seal (202) are respectively provided with a shaft seal shaft exhaust pipe (16), and the shaft seal shaft exhaust pipe (16) is combined into a main pipe which is sequentially provided with a flow regulating valve (18), a shaft exhaust fan (17) and a check valve (19).
7. The energy-saving and efficient steam turbine gland seal steam supply system according to claim 6, wherein: and a steam seal heater (27) is arranged on the main pipe of the shaft seal shaft exhaust pipe (16).
8. The energy-saving and efficient steam turbine gland seal steam supply system according to claim 6, wherein: the flow control valves (18), the shaft exhaust fans (17) and the check valves (19) are connected in parallel in two groups.
9. The energy-saving and efficient steam turbine gland seal steam supply system according to claim 6, wherein: and one side of a main pipe of the shaft seal shaft exhaust pipe (16) is provided with an exhaust pipe bypass pipe (20), and the exhaust pipe bypass pipe (20) is provided with a stop valve (9).
10. The energy-saving high-efficiency steam turbine gland seal steam supply system according to any one of claims 1 to 5, characterized in that: and a spring type safety valve (8) is arranged on the pressure equalizing box (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020705672.3U CN211924258U (en) | 2020-04-30 | 2020-04-30 | Energy-saving and efficient steam seal steam supply system of steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020705672.3U CN211924258U (en) | 2020-04-30 | 2020-04-30 | Energy-saving and efficient steam seal steam supply system of steam turbine |
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| CN211924258U true CN211924258U (en) | 2020-11-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115387861A (en) * | 2022-09-26 | 2022-11-25 | 宝武集团鄂城钢铁有限公司 | Steam turbine vacuum system and method |
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2020
- 2020-04-30 CN CN202020705672.3U patent/CN211924258U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115387861A (en) * | 2022-09-26 | 2022-11-25 | 宝武集团鄂城钢铁有限公司 | Steam turbine vacuum system and method |
| CN115387861B (en) * | 2022-09-26 | 2024-06-11 | 宝武集团鄂城钢铁有限公司 | Steam turbine vacuum system and method |
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