CN210512709U - Condensate recovery system for steam leakage of steam turbine shaft seal - Google Patents
Condensate recovery system for steam leakage of steam turbine shaft seal Download PDFInfo
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- CN210512709U CN210512709U CN201921385264.8U CN201921385264U CN210512709U CN 210512709 U CN210512709 U CN 210512709U CN 201921385264 U CN201921385264 U CN 201921385264U CN 210512709 U CN210512709 U CN 210512709U
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Abstract
The utility model discloses a condensate recovery system that can be used to steam turbine bearing seal leakage steam. The recovery system comprises a shaft seal condenser and a condensate recovery pump; the inlet of the condensate recovery pump is connected with the shell pass liquid outlet of the shaft seal condenser, the pump cavity of the condensate recovery pump is communicated with the shell pass gas phase of the shaft seal condenser, the outlet of the condensate recovery pump is connected with the shell pass gas phase space of the steam turbine condenser, and the condensate recovery pump is driven by steam. The condensate of the steam leaked by the shaft seal of the steam turbine is completely recycled, zero emission of the steam leaked by the shaft seal is achieved, and the fuel cost and the production cost are reduced; anti-series prevention measures of steam and condensate are arranged at an inlet and an outlet of the condensate recovery pump, so that the running stability of the device is ensured; by adjusting the arrangement mode of the condensate recovery pump and adding the mechanical automatic liquid level control starting and stopping functions, the full-automatic recovery operation can be realized, and the operation mode is simple; the device has simple structure, easy modification and wide application range.
Description
Technical Field
The utility model belongs to the technical field of chemical industry and power station, in particular to condensate recovery system who can be used to steam turbine bearing seal leakage steam.
Background
Steam turbines are widely used as drivers of dynamic equipment such as compressors, fans and pumps in chemical plants, power stations and other devices, and most of the steam turbines are matched with shaft seal steam extraction and condensation systems so as to extract leakage steam of a steam seal at the shaft end of the steam turbine and avoid polluting the surrounding environment.
The existing steam turbine adopts a mode of directly discharging condensate of shaft seal leakage steam, an ejector communicated with a shell pass of a shaft seal condenser pumps the steam leaked from the shaft seal of the steam turbine into the shell pass of the shaft seal condenser, the steam is cooled by circulating water of a tube pass, and the leaked steam is directly discharged to a trench after being cooled into condensate. In order to prevent atmosphere from reversely crossing and entering the condenser, a U-shaped bent water seal is arranged on the condensate discharge pipe.
The problems of the existing direct discharge mode of steam condensate during steam turbine shaft seal leakage are as follows: 1) in order to prevent atmosphere from entering the condenser in a reverse-serial mode, required water seal liquid level must be established in the condensate discharging U-shaped bent pipe before the steam turbine is started each time; after the steam turbine is stopped, the water seal in the U-shaped bent pipe must be completely discharged so as to avoid freezing and cracking the discharge pipe, so that the production operation requirement is high, the operation is complicated, and misoperation is easily caused; 2) the water seal liquid level in the condensate discharging U-shaped bend is required to be established to a required liquid level, and only manual liquid filling is required, the water seal liquid level is manually judged, once the water seal liquid level is insufficient, an ejector is caused to suck air into a shaft seal condenser, steam leaked from a shaft seal of a steam turbine cannot be discharged, the steam turbine cannot stably operate, and the stable operation of a device is possibly influenced; 3) steam leaked from a shaft seal of the steam turbine is cooled into condensate and then directly discharged to a trench, and the amount of desalted water supplement is increased by directly discharging the condensate; 4) the larger the turbine model is, the more steam leaks; if the number of the steam turbines in the device is more, the leakage steam is more, the direct discharge amount of steam condensate is larger, and the waste is larger; 5) the temperature of steam leaked by a shaft seal of a steam turbine is usually 300-450 ℃, the heat of high-temperature steam is obtained from combustion fuel, and steam condensate is directly discharged to cause indirect waste of the fuel; 6) condensate of steam leaked by the shaft seal is discharged to the sewage treatment device through the trench, so that the sewage treatment capacity is increased, and the sewage treatment cost is increased.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, an object of the utility model is to provide a condensate recovery system of steam turbine bearing seal leakage steam adopts simple system transformation, can retrieve the condensate completely to reach the zero release, easy and simple to handle simultaneously.
The utility model discloses a following technical scheme:
a condensate recovery system for steam leakage of a steam turbine shaft seal comprises a shaft seal condenser and a condensate recovery pump; the inlet of the condensate recovery pump is connected with the shell pass liquid outlet of the shaft seal condenser, the pump cavity of the condensate recovery pump is communicated with the shell pass gas phase of the shaft seal condenser, the outlet of the condensate recovery pump is connected with the shell pass gas phase space of the steam turbine condenser, and the condensate recovery pump is driven by steam. The pump cavity of the condensate recovery pump is connected with the shell pass gas phase of the shaft seal condenser, so that the pressure of the condensate recovery pump and the shell pass of the shaft seal condenser is kept balanced, and the condensate can conveniently enter the condensate recovery pump from the shaft seal condenser. The condensate recovery pump is driven by steam, and the condensate is conveyed into the steam turbine condenser through the pressure difference between the power steam and the steam turbine condenser, so that the purpose of recovering the condensate is achieved.
Alternatively, the condensate recovery pump is disposed below the shaft seal condenser so that condensate in the shaft seal condenser can flow into the condensate recovery pump by itself.
Alternatively, when the low position is inconvenient to arrange, a transfer pump can be arranged between the shaft seal condenser and the condensate recovery pump, and the condensate is transferred to the condensate recovery pump from the shaft seal condenser.
Further, the inlet and the outlet of the condensate recovery pump are respectively provided with a check valve. The check valve is arranged at the inlet of the pump to prevent steam from reversely crossing, and the check valve is arranged at the outlet of the pump to prevent condensate from reversely crossing, so that the influence on the stable operation of the device is avoided.
Further, the condensate recovery pump is driven by low-pressure superheated steam and is provided with a low-pressure superheated steam inlet pipeline with a control valve.
Furthermore, the condensate recovery pump is a pneumatic mechanical booster pump and has the function of mechanical automatic liquid level control starting and stopping. The control valve of the low-pressure superheated steam inlet pipeline is a manual valve; the condensate recovery pump is provided with a liquid level floating ball device, the liquid level floating ball device is linked with a steam valve arranged in the condensate recovery pump through a connecting rod device, and the start and stop of the pump can be controlled by triggering the on-off of the steam valve arranged in the condensate recovery pump after the liquid level of the condensate recovery pump rises or falls to a certain liquid level.
Further, a control valve of the low-pressure superheated steam inlet pipeline is an automatic control valve; the condensate recovery pump is provided with a liquid level monitoring device, the automatic control valve is connected with a control system of the condensate recovery pump, when the condensate enters the condensate recovery pump and rises to reach a set liquid level, the automatic control valve is opened, and power steam enters the condensate conveying device and conveys the condensate to the steam turbine condenser; when the condensate is discharged from the condensate recovery pump and falls to a set liquid level, the automatic control valve is closed, and the entry of power steam is cut off.
Further, the control system is a DCS control system or a PLC control assembly.
The utility model discloses following beneficial effect has: the utility model has convenient production and operation, realizes the complete recovery of condensate of steam leaked by the shaft seal of the steam turbine, achieves the zero emission of the steam leaked by the shaft seal, and reduces the fuel cost and the production cost; the inlet and outlet of the condensate recovery pump are provided with anti-series prevention measures of steam and condensate, so that the running stability of the device is ensured; by adjusting the arrangement mode of the condensate recovery pump and adding the mechanical automatic liquid level control starting and stopping functions, the full-automatic recovery operation can be realized, and the operation mode is simple; the device has simple structure, easy modification and wide application range.
Drawings
FIG. 1 is a schematic view of a condensate recovery system of the present invention;
description of reference numerals: the system comprises a 1-shaft seal condenser, a 2-condensate recovery pump, a 3-steam turbine shaft seal leakage steam inlet, a 4-steam ejector, a 5-circulating water inlet, a 6-water return port, a 7-balance pipe, an 8-steam turbine condenser, a 9-low pressure superheated steam inlet pipeline, a 10-check valve and an 11-automatic control valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
As shown in the attached figure 1, the condensate recovery system for steam leakage of the steam turbine shaft seal comprises a shaft seal condenser 1 and a condensate recovery pump 2; the shaft seal condenser 1 is used as a condensing device in the prior art and is provided with a steam turbine shaft seal leakage steam inlet 3, a steam ejector 4, a circulating water inlet 5 and a water return port 6; the condensate recovery pump 2 is arranged at a position lower than the shaft seal condenser 1, so that condensate in the shaft seal condenser 1 can automatically flow into the condensate recovery pump 2, an inlet of the condensate recovery pump 2 is connected with a shell pass liquid discharge port of the shaft seal condenser 1, a pump cavity of the condensate recovery pump 2 is connected with a shell pass gas phase of the shaft seal condenser 1 through a balance pipe 7, so that the pressure of the condensate recovery pump 2 and the shell pass of the shaft seal condenser 1 is kept balanced, an outlet of the condensate recovery pump 2 is connected with a shell pass gas phase space of a steam turbine condenser 8, the condensate recovery pump 2 is driven by low-pressure superheated steam, and a low-pressure superheated steam inlet pipeline 9 with a control valve is arranged. And check valves 10 are respectively arranged at the inlet and the outlet of the condensate recovery pump 2 to prevent steam and condensate from reversely crossing. The condensate recovery pump 2 is a pneumatic mechanical booster pump and has the function of mechanical automatic liquid level control starting and stopping. Specifically, the condensate recovery pump 2 is provided with a liquid level floating ball device, the control valve of the low-pressure superheated steam inlet pipeline 9 is a manual valve 11, the liquid level floating ball device is linked with a steam valve arranged in the condensate recovery pump through a connecting rod device, and when the liquid level of the condensate recovery pump 2 rises or falls to a certain liquid level, the steam valve arranged in the condensate recovery pump 2 can be triggered to be opened and closed to control the steam start and stop of the pump.
The device has the following operation process: steam leaked by a steam turbine shaft seal enters a shaft seal condenser 1 to form condensate, the condensate leaked by the steam turbine shaft seal automatically flows into a condensate recovery pump 2 from a shell side liquid outlet of the shaft seal condenser 1, when a set liquid level is reached, the characteristic of mechanical automatic liquid level control starting and stopping of the condensate recovery pump 2 is utilized, the prior art that a liquid level floating ball device is linked with a steam valve arranged in the condensate recovery pump 2 through a connecting rod device is adopted, when the liquid level of the condensate recovery pump 2 rises to a certain liquid level, the connecting rod can be pushed, a steam valve arranged in the condensate recovery pump 2 and connected to the other end of the connecting rod is triggered to be opened, low-pressure overheat power steam is introduced, and the condensate is conveyed into a steam turbine condenser 8 through the pressure difference between the power steam and the steam turbine condenser 8; when the condensate is discharged from the condensate recovery pump 2 and drops to a set liquid level, the liquid level floating ball device triggers a steam valve arranged in the condensate recovery pump 2 connected with the other end of the connecting rod to be closed by pushing the connecting rod device, steam is cut off, the condensate with steam leaked by the steam turbine shaft seal automatically flows into the condensate recovery pump 2 from a shell side liquid outlet of the shaft seal condenser 1 again, and the process is repeated.
In another embodiment of the scheme, a self-control valve can be arranged at the inlet pipeline of the low-pressure superheated steam, and the inlet of the low-pressure superheated steam is controlled by a DCS or PLC self-control system according to a liquid level change program.
The utility model discloses production operation is convenient, has realized that the condensate of steam turbine bearing seal leakage steam retrieves completely, reaches the zero release that the steam was leaked to the bearing seal.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A condensate recovery system of steam turbine shaft seal leakage steam is characterized in that: comprises a shaft seal condenser and a condensate recovery pump; the inlet of the condensate recovery pump is connected with the shell pass liquid outlet of the shaft seal condenser, the pump cavity of the condensate recovery pump is communicated with the shell pass gas phase of the shaft seal condenser, the outlet of the condensate recovery pump is connected with the shell pass gas phase space of the steam turbine condenser, and the condensate recovery pump is driven by steam.
2. A condensate recovery system according to claim 1, wherein: the condensate recovery pump is arranged at a position lower than the shaft seal condenser or a conveying pump is arranged between the shaft seal condenser and the condensate recovery pump to convey condensate.
3. A condensate recovery system according to claim 1, wherein: and the inlet and the outlet of the condensate recovery pump are respectively provided with a check valve.
4. A condensate recovery system according to claim 1, wherein: the condensate recovery pump is driven by low-pressure superheated steam and is provided with a low-pressure superheated steam inlet pipeline with a control valve.
5. A condensate recovery system according to claim 4, wherein: the condensate recovery pump is a pneumatic mechanical booster pump and has the function of mechanical automatic liquid level control starting and stopping.
6. A condensate recovery system according to claim 5, wherein: when the control valve of the low-pressure superheated steam inlet pipeline is a manual valve; the condensate recovery pump is provided with a liquid level floating ball device, the liquid level floating ball device is linked with a steam valve arranged in the condensate recovery pump through a connecting rod device, and the start and stop of the pump can be controlled by triggering the on-off of the steam valve arranged in the condensate recovery pump after the liquid level of the condensate recovery pump rises or falls to a certain liquid level.
7. A condensate recovery system according to claim 5, wherein: when the control valve of the low-pressure superheated steam inlet pipeline is an automatic control valve; the condensate recovery pump is provided with a liquid level monitoring device, the automatic control valve is connected with a control system of the condensate recovery pump, when the condensate enters the condensate recovery pump and rises to reach a set liquid level, the automatic control valve is opened, and power steam enters the condensate conveying device and conveys the condensate to the steam turbine condenser; when the condensate is discharged from the condensate recovery pump and falls to a set liquid level, the automatic control valve is closed, and the entry of power steam is cut off.
8. A condensate recovery system according to claim 7, wherein: the control system is a DCS control system or a PLC control assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921385264.8U CN210512709U (en) | 2019-08-23 | 2019-08-23 | Condensate recovery system for steam leakage of steam turbine shaft seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921385264.8U CN210512709U (en) | 2019-08-23 | 2019-08-23 | Condensate recovery system for steam leakage of steam turbine shaft seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210512709U true CN210512709U (en) | 2020-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921385264.8U Active CN210512709U (en) | 2019-08-23 | 2019-08-23 | Condensate recovery system for steam leakage of steam turbine shaft seal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210512709U (en) |
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2019
- 2019-08-23 CN CN201921385264.8U patent/CN210512709U/en active Active
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