CN210768936U - Shaft seal steam supply system with cooling device - Google Patents
Shaft seal steam supply system with cooling device Download PDFInfo
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- CN210768936U CN210768936U CN201921258703.9U CN201921258703U CN210768936U CN 210768936 U CN210768936 U CN 210768936U CN 201921258703 U CN201921258703 U CN 201921258703U CN 210768936 U CN210768936 U CN 210768936U
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Abstract
The utility model relates to a steam turbine vapor seal system technical field, especially a take cooling device's bearing seal steam supply system. The cooler is also connected with a cooling pipeline, and condensed water flows into the cooler from one end of the cooling pipeline, is heated and then flows out of the cooling pipeline to a #7 low-pressure heater outlet condensed water main pipe; the first temperature reduction device is also connected with one end of a first temperature reduction pipeline, and condensed water flows in from the other end of the first temperature reduction pipeline. The first section of main pipeline is respectively connected with a high-pressure cylinder main steam valve rod, a high-pressure cylinder regulating valve rod, a medium-pressure cylinder main steam valve rod, a medium-pressure cylinder regulating valve rod, a high-pressure cylinder front-rear shaft seal, a medium-pressure cylinder front-rear shaft seal and a steam-driven feed pump steam turbine front shaft seal through branches. The second section of main pipeline is respectively connected with a low-pressure cylinder shaft seal and a steam-driven feed pump steam turbine rear shaft seal through a branch. The third section of main pipeline is respectively connected with a #8 low-pressure heater and a condenser through a branch. The system uses the condensed water to cool the shaft seal overflow steam.
Description
Technical Field
The utility model relates to a steam turbine vapor seal system technical field, especially a take cooling device's bearing seal steam supply system.
Background
At present, 1000MW steam turbine steam seal systems all adopt self-sealing steam seal systems, namely, when a unit normally operates, the steam turbine steam seal system which utilizes the leaked steam of the shaft seals of the high pressure cylinder and the medium pressure cylinder as steam for the shaft seal steam seal of the low pressure cylinder after the temperature reduction through water spraying, and the redundant leaked steam overflows to a #8 low-pressure heater or a condenser through an overflow station. The current design is that shaft seal overflow is discharged to a #8 low-pressure heater, the normal running pressure of the shaft seal overflow is less than 35kPa, the pressure of the #8 low-pressure heater is between 0kPa and a vacuum state, the temperature of shaft seal overflow steam is 430 ℃ under the general working condition, the maximum working condition of full load is 490 ℃, the shell side design temperature of the #8 low-pressure heater where the shaft seal overflow steam enters is only 180 ℃, and the eighth stage steam extraction temperature of a steam inlet positioned at the central part of a shell of the #8 low-pressure heater is rated as 130 ℃. As important equipment of a regenerative system, when a #8 low-pressure heater operates, because the temperature difference between the shaft seal overflow steam inlet and the eighth-stage steam extraction air inlet is large, and because a plurality of parts of the #8 low-pressure heater are welded in a seam mode, the large temperature difference causes alternating stress cracking and leakage of a welding seam, the use safety and the service life cycle of the equipment are endangered, and the safe operation of a unit is influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a take cooling device's bearing seal steam supply system, adopt the condensate direct cooling and set up the mode of the indirect heat transfer of cooler, get into a cooler before bearing seal overflow steam gets into #8 low pressure feed water heater or condenser earlier, reentrant #8 low pressure feed water heater or condenser after reducing the steam temperature to the admission temperature, the flow size according to condensate and bearing seal overflow steam realizes the desuperheating of condensate to bearing seal overflow steam and adjusts, reduce #8 low pressure feed water heater tube bank loss, reduce the #8 low pressure feed water heater water level anomaly that arouses because of inside heat exchange tube leakage, reduce #8 low pressure feed water heater leakage rate, prolong #8 low pressure feed water heater's life, guarantee the reliable operation that drops into of #8 low pressure feed water heater system, play good improvement to #8 low pressure feed water heater operating mode.
In order to solve the technical problem, the utility model discloses a following technical scheme: a shaft seal steam supply system with a cooling device comprises a third section of main pipeline, a cooler, a first section of main pipeline, a first temperature reduction device and a second section of main pipeline which are sequentially connected, wherein the cooler is also connected with a cooling pipeline, and condensed water flows into the cooler from one end of the cooling pipeline, is heated and then flows out of a condensed water main pipe of an outlet of a #7 low-pressure heater from the cooling pipeline; the first temperature reduction device is also connected with one end of a first temperature reduction pipeline, and condensed water flows in from the other end of the first temperature reduction pipeline; wherein the first section of main pipeline is respectively connected with a high-pressure cylinder main steam valve rod, a high-pressure cylinder regulating valve rod, a medium-pressure cylinder main steam valve rod, a medium-pressure cylinder regulating valve rod, a high-pressure cylinder front and rear shaft seal, a medium-pressure cylinder front and rear shaft seal and a steam-driven feed pump steam turbine front shaft seal through branches; wherein the second section of main pipeline is respectively connected with a low pressure cylinder shaft seal and a steam turbine rear shaft seal of a steam feed pump through a branch; and the third section of main pipeline is respectively connected with a #8 low-pressure heater and a condenser through a branch. The utility model discloses a condensate water cools off bearing seal overflow steam, adopt the condensate water direct cooling and set up the mode of the indirect heat transfer of cooler, the flow size of the condensate water that gets into the cooler according to control realizes the desuperheating regulation of counter shaft seal overflow steam, reduce #8 low pressure feed water heater tube bank loss, prolong #8 low pressure feed water heater's life, reduce the unusual scheduling problem of #8 low pressure feed water heater water level that arouses because of the leakage of the heat exchange tube of inside, still provide the condensate water after the intensification for the export of #7 low pressure feed water heater simultaneously, satisfy its operation requirement.
The shaft seal steam supply system with the cooling device further comprises a first control system, a third control system and a control background, wherein the first control system and the third control system are both electrically connected to the control background. The first control system is arranged on the first desuperheating pipeline, and the third control system is arranged on one side, close to the cooler, of the first section of main pipeline. The first section of main pipeline, the first temperature reduction pipeline and each device are respectively provided with a temperature sensor, a pressure sensor and other devices, and the temperature sensor, the pressure sensor and other devices are in signal connection with the control background. And sending a signal after the background is controlled to analyze information such as temperature and pressure, so that the on-off or opening degree of the first control system and the third control system is controlled, and further parameters such as the flow of condensed water are adjusted, and the temperature reduction adjustment of the shaft seal overflow steam by the condensed water is realized. Specifically, the control background may be a DCS system.
In the shaft seal steam supply system with the cooling device, the cooling pipeline comprises a first cooling pipeline and a second cooling pipeline; a water pipeline and a steam chamber are arranged in the cooler, wherein the surface of the steam chamber is provided with an inlet and an outlet, the inlet of the steam chamber is communicated with the end part of the first section of main pipeline, and the outlet of the steam chamber is communicated with the end part of the third section of main pipeline; wherein the water pipeling can encircle to arrange etc. in the cooler, and the water pipelining mouth of pipe and steam chamber contactless for the water pipeling flows is the condensate water, and the indoor flow of steam is steam, and the condensate water does not produce direct contact with steam. The water inlet side of the water pipeline is connected with the end part of the first cooling pipeline, and condensed water flows in from the other end of the first cooling pipeline; the water outlet side of the water pipeline is connected with the end part of a second cooling pipeline, and the other end of the second cooling pipeline is connected with a #7 low-pressure heater outlet condensed water main pipe; the first cooling pipeline is sequentially provided with a second manual valve, a pipeline pump, a third electric valve and a second pneumatic adjusting valve along the flowing direction of the condensed water, wherein the third electric valve and the second pneumatic adjusting valve are electrically connected to the control background; and the second cooling pipeline is provided with a fourth electric valve which is electrically connected to the control background. The third electric valve is used for isolating the outlet of the booster pump, the booster pump is closed before being started, and the instant safety of the starting of the pump and the system isolation of the booster pump and the cooler during maintenance are guaranteed. The pipeline pump boosts the condensed water to enter the cooler, overcomes the system resistance and ensures that the condensed water at the outlet of the cooler has enough pressure to flow into the outlet condensed water main pipe of the #7 low-pressure heater. The second manual valve is used for closing the isolation during equipment maintenance, such as maintenance of a booster pump, a cooler and the like. The second pneumatic regulating valve is used for regulating the flow of condensate water entering the cooler so as to realize accurate control of the temperature of shaft seal overflow steam. The condensed water with the lower temperature of 30-45 ℃ enters a water pipeline of the cooler through the first cooling pipeline under the action of the pipeline pump, at the moment, high-temperature steam is gathered in the steam chamber, the high-temperature steam exchanges heat with low-temperature condensed water in the water pipeline, the steam temperature in the steam chamber is reduced after heat exchange, and the temperature of the condensed water in the water pipeline is increased. The heated condensed water flows into the outlet condensed water main pipe of the #7 low-pressure heater through the second cooling pipeline, the temperature range is 95-120 ℃, and the water temperature requirement of the condensed water is met. In addition, the steam after being cooled in the steam chamber enters one or more devices in a #8 low-pressure heater or a condenser through a third section of main pipeline.
In the shaft seal steam supply system with the cooling device, the first temperature reduction pipeline is further provided with a filtering device, and the filtering device is located between the first temperature reduction device and the first control system. Because the low-pressure cylinder has higher requirement on the cleanliness of flowing steam and the like, the first temperature reduction pipeline is also provided with the filtering device to purify flowing condensed water and ensure the cleanliness of the mixed steam in the second section of main pipeline, thereby meeting the operation requirement of the low-pressure cylinder.
In the shaft seal steam supply system with the cooling device, the filtering device comprises a fourth manual valve a, a fourth manual valve B, a fourth manual valve C, a filter screen and a fourth bypass, wherein the fourth manual valve a, the filter screen and the fourth manual valve B are sequentially installed on the first desuperheating pipeline along the flowing direction of the condensed water; two ends of a fourth bypass are both communicated with the first temperature reduction pipeline, wherein a first node of the fourth bypass communicated with the first temperature reduction pipeline is positioned on one side, close to the first control system, of the fourth manual valve A, and a second node of the fourth bypass communicated with the first temperature reduction pipeline is positioned on one side, close to the first temperature reduction device, of the fourth manual valve B; and a fourth manual valve C is arranged on the fourth bypass. And in a normal state, the fourth manual valve A and the fourth manual valve B are manually adjusted to be in an on state, the fourth manual valve C is manually adjusted to be in an off state, the fourth bypass is disconnected at the moment, and the condensed water flows through the fourth manual valve A, the filter screen and the fourth manual valve B through the first temperature reduction pipeline, is purified and then enters the first temperature reduction device for temperature reduction. If the filter screen needs to be maintained or replaced, the fourth manual valve A and the fourth manual valve B can be manually adjusted to be in a closed state, the fourth manual valve C can be manually adjusted to be in an open state, and the fourth bypass is a standby passage.
According to the shaft seal steam supply system with the cooling device, the third section of main pipeline is further provided with the first electric valve on the branch pipeline connected with the #8 low-pressure heater, the third section of main pipeline is further provided with the second electric valve on the branch pipeline connected with the condenser, and the first electric valve and the second electric valve are electrically connected to the control background. The first electric valve and the second electric valve are in an on state and an off state under the control of the control background, so that steam released from the first section of main pipeline and cooled by the cooler can enter one of a #8 low-pressure heater and a condenser.
The shaft seal steam supply system with the cooling device further comprises an auxiliary steam system, a steam supply regulating valve and an auxiliary steam pipeline, wherein one end of the auxiliary steam pipeline is communicated with the first section of the main pipeline, the other end of the auxiliary steam pipeline is communicated with the auxiliary steam system, and the auxiliary steam pipeline is provided with the steam supply regulating valve; wherein the steam supply regulating valve is electrically connected to the control background. The auxiliary steam system and the auxiliary steam pipeline are used as standby steam sources, and the opening degree of the auxiliary steam pipeline is controlled through the steam supply regulating valve, so that the steam turbine can automatically keep the steam pressure set in the steam supply main pipes of the first section of main pipeline, the second section of main pipeline and the like under any operation working condition.
In the shaft seal steam supply system with the cooling device, the first control system includes a first manual valve a, a first manual valve B, a first manual valve C, a first pneumatic regulating valve a and a first bypass, and the first pneumatic regulating valve a is electrically connected to the control background; the first manual valve A, the first pneumatic adjusting valve A and the first manual valve B are sequentially arranged on the first desuperheating pipeline along the flowing direction of the condensed water; two ends of the first bypass are both communicated with the first temperature-reducing pipeline, wherein a first node of the first bypass communicated with the first temperature-reducing pipeline is positioned on one side, away from the first pneumatic regulating valve A, of the first manual valve A, and a second node of the first bypass communicated with the first temperature-reducing pipeline is positioned on one side, away from the first pneumatic regulating valve A, of the first manual valve B; the first bypass is provided with a first manual valve C. Under the normal operating mode, with first manual valve A, first manual valve B manual regulation to the state of opening, with the state that first manual valve C manual regulation was closed simultaneously, first bypass disconnection this moment, the condensate water gets into first temperature reduction device through first temperature reduction pipeline and accomplishes work such as temperature reduction regulation, according to the temperature demand in the pipeline, the control backstage can send control signal and adjust first pneumatic adjusting valve A's aperture in real time. If first pneumatic governing valve A breaks down, can close first manual valve A, first manual valve B maintains, and manually open first manual valve C this moment makes first bypass intercommunication continue work as spare pipeline.
In the shaft seal steam supply system with the cooling device, the third control system includes a third manual valve, a third pneumatic regulating valve and a third bypass, wherein the third pneumatic regulating valve is installed on the first section of main pipeline and is electrically connected with the control background; two ends of the third bypass are both communicated with the first section of main pipeline, wherein a first node of the third bypass communicated with the first section of main pipeline is positioned on one side of the third pneumatic regulating valve close to the cooler, and a second node of the third bypass communicated with the first section of main pipeline is positioned on one side of the third pneumatic regulating valve far away from the cooler; and a third manual valve is arranged on the third bypass. Under normal operating mode, with the state that third manual valve manual regulation closed, the disconnection of third bypass this moment, steam flows through third pneumatic control valve through first section main line and gets into the cooler cooling, according to pressure demand in the pipeline, and the control backstage can send control signal real-time regulation third pneumatic control valve's aperture. If the third pneumatic regulating valve fails, the third manual valve is manually opened at the moment, so that the third bypass is communicated to be used as a standby pipeline to continue working.
In the shaft seal steam supply system with the cooling device, the first temperature reduction device is a water spray atomizing nozzle, wherein the first temperature reduction device is arranged in the first section of the main pipeline. The condensed water is sprayed on the surface of the steam in an atomized state, so that the cooling effect is achieved.
Compared with the prior art, the utility model discloses an useful part lies in:
1. the shaft seal overflow steam enters a cooler before entering a #8 low-pressure heater or a condenser, the steam temperature is reduced to the allowable temperature and then enters the #8 low-pressure heater or the condenser, a cooling water source is taken from condensed water, the condensed water after heat exchange of the cooler is connected to a condensed water main pipe at the outlet of the #7 low-pressure heater, and the shaft seal overflow steam is cooled and adjusted by controlling the flow of the cooling water (namely the condensed water);
2. the shaft seal overflow steam is cooled by adopting condensed water through a temperature reduction device, a temperature reduction pipeline and the like, and meanwhile, the condensed water flow and the shaft seal overflow steam flow are controlled through a plurality of control systems and control backgrounds, specifically a plurality of control valves and the like, so that the temperature reduction adjustment of the condensed water on the shaft seal overflow steam is realized, and the damage to a #8 low-pressure heater and a condenser is avoided;
3. the utility model discloses under the different load operating mode of unit, the operating pressure of equipment such as bearing seal, steam feed pump steam turbine front shaft seal, low pressure jar bearing seal, steam feed pump steam turbine rear shaft seal around bearing seal, the middle pressure jar main steam valve rod, middle pressure jar governing valve rod, the high pressure jar main steam valve rod, the middle pressure jar governing valve rod, the high pressure jar is changed. When the load of the unit is greater than 40% of rated load, the steam leakage of the high-pressure cylinder main steam valve rod, the high-pressure cylinder regulating valve rod, the intermediate-pressure cylinder main steam valve rod, the intermediate-pressure cylinder regulating valve rod and the steam leakage of the front and rear shaft seals of the high and intermediate pressure cylinders are greater than the operating pressure required by the steam supply main pipe, the leaked steam of the equipment automatically flows into the steam supply main pipe, the steam is supplied to the low-pressure cylinder shaft seal and the rear shaft seal of the steam-driven water-feeding pump steam turbine after being reduced in temperature by the first temperature reducing device, and the redundant shaft seal steam overflows to a #8 low-pressure heater or. When the load of the unit is less than 40% of rated load, when the steam leakage of the high-pressure cylinder main steam valve rod, the high-pressure cylinder regulating valve rod, the intermediate-pressure cylinder main steam valve rod and the intermediate-pressure cylinder regulating valve rod and the steam leakage of the front and rear shaft seals of the high and intermediate pressure cylinders can not maintain the operating pressure required by the steam supply main pipe, the auxiliary steam system supplies steam to the steam supply main pipe to maintain the steam pressure in the steam supply main pipe to meet the specified pressure requirement. Along with the change of the load of the group, the fluid automatically flows from high pressure to low pressure due to the characteristics of the fluid, so that the accurate outflow and the accurate entry are ensured;
4. after the system is applied, the operating condition of the #8 low-pressure heater is well improved, the reliable operation of the system is ensured, the leakage rate of the #8 low-pressure heater is reduced, the reliable operation of the #8 low-pressure heater system is ensured, the pipe bundle loss of the #8 low-pressure heater is reduced, the service life of the #8 low-pressure heater is prolonged, the abnormal water level of the #8 low-pressure heater caused by the leakage of an internal heat exchange pipe is reduced, and the problems of water inlet of a steam turbine, unit safety hazard and the like are avoided;
5. from the trade all, designed this type shaft seal overflow system's steam turbine unit and all can optimize, upgrade and reform transform the back and use the utility model discloses, can gain considerable economic benefits, reduce the overhaul of the equipments work load by a wide margin, be worth popularizing and applying.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic diagram of a connection relationship between parts in the present invention.
The meaning of the reference numerals: 1-a first section of main pipeline, 2-a second section of main pipeline, 3-a third section of main pipeline, 4-a first desuperheating pipeline, 6-a first desuperheating device, 8-a filtering device, 81-a fourth manual valve A, 82-a fourth manual valve B, 83-a fourth manual valve C, 84-a strainer, 85-a fourth bypass, 9-a first control system, 91-a first manual valve A, 92-a first manual valve B, 93-a first manual valve C, 94-a first pneumatic regulating valve A, 95-a first bypass, 11-a third control system, 111-a third manual valve, 112-a third pneumatic regulating valve, 113-a third bypass, 12-a first electric valve, 13-a second electric valve, 14-an auxiliary steam system, 15-steam supply regulating valve, 16-cooler, 161-water pipeline, 162-steam chamber, 17-first cooling pipeline, 18-second cooling pipeline, 19-third electric valve, 20-fourth electric valve, 21-pipeline pump, 22-second manual valve and 23-second pneumatic regulating valve.
The present invention will be further described with reference to the accompanying drawings and the detailed description.
Detailed Description
Embodiment 1 of the utility model: as shown in fig. 1 and 2, a shaft seal steam supply system with a cooling device comprises a third section of main pipeline 3, a cooler 16, a first section of main pipeline 1, a first temperature reduction device 6 and a second section of main pipeline 2 which are connected in sequence, wherein the cooler 16 is also connected with a cooling pipeline, and condensed water flows into the cooler 16 from one end of the cooling pipeline, is heated and then flows out of a condensed water main pipe of an outlet of a #7 low-pressure heater from the cooling pipeline; the first temperature reduction device 6 is also connected with one end of the first temperature reduction pipeline 4, and condensed water flows in from the other end of the first temperature reduction pipeline 4; wherein, the first section main pipeline 1 is respectively connected with a high pressure cylinder main steam valve rod, a high pressure cylinder regulating valve rod, a middle pressure cylinder main steam valve rod, a middle pressure cylinder regulating valve rod, a high pressure cylinder front and rear shaft seal, a middle pressure cylinder front and rear shaft seal and a steam feed pump steam turbine front shaft seal through branches; wherein, the second section of main pipeline 2 is respectively connected with a low pressure cylinder shaft seal and a steam turbine rear shaft seal of a steam feed pump through a branch; wherein the third section of main pipeline 3 is respectively connected with a #8 low-pressure heater and a condenser through a branch. The utility model discloses a condensate water cools off bearing seal overflow steam, adopt the condensate water direct cooling and set up the mode of the indirect heat transfer of cooler, the flow size according to bearing seal overflow steam realizes the desuperheating regulation of condensate water counter shaft seal overflow steam, reduce the loss of #8 low pressure feed water heater tube bank, extension # 8 low pressure feed water heater's life, reduce the unusual scheduling problem of #8 low pressure feed water heater water level that arouses because of the heat exchange tube leakage of inside, still provide the condensate water after heaing up for the export of #7 low pressure feed water heater simultaneously, satisfy its operation requirement. Further, the shaft seal steam supply system with the cooling device further comprises a first control system 9, a third control system 11 and a control background, wherein the first control system 9 and the third control system 11 are electrically connected to the control background. Wherein the first control system 9 is arranged on the first desuperheating pipeline 4, and the third control system 11 is arranged on one side of the first section of the main pipeline 1 close to the cooler 16. The first section of main pipeline 1, the first temperature-reducing pipeline 4 and each device are respectively provided with a temperature sensor, a pressure sensor and other devices, and the temperature sensor, the pressure sensor and other devices are in signal connection with the control background. And sending a signal after the background is controlled to analyze information such as temperature and pressure, so that the opening and closing or opening of the first control system 9 and the third control system 11 are controlled, parameters such as condensate flow and the like are adjusted, and accordingly the temperature reduction adjustment of the condensate on the shaft seal overflow steam is realized. Specifically, the control background may be a DCS system. Specifically, the cooling ducts include a first cooling duct 17 and a second cooling duct 18; a water pipe 161 and a steam chamber 162 are arranged in the cooler 16, wherein an inlet and an outlet are arranged on the surface of the steam chamber 162, the inlet of the steam chamber 162 is communicated with the end part of the first-stage main pipeline 1, and the outlet of the steam chamber 162 is communicated with the end part of the third-stage main pipeline 3; wherein the water pipe 161 can be arranged around the cooler 16, and the like, the pipe mouth of the water pipe 161 is not contacted with the steam chamber 162, so that the condensed water flows in the water pipe 161, the steam flows in the steam chamber 162, and the condensed water and the steam are not directly contacted. The water inlet side of the water pipe 161 is connected to the end of the first cooling pipe 17, and the condensed water flows in from the other end of the first cooling pipe 17; the water outlet side of the water pipe 161 is connected with the end part of the second cooling pipe 18, and the other end of the second cooling pipe 18 is connected with a #7 low-pressure heater outlet condensed water main pipe; a second manual valve 22, a pipeline pump 21, a third electric valve 19 and a second pneumatic adjusting valve 23 are sequentially arranged on the first cooling pipeline 17 along the flowing direction of the condensed water, wherein the third electric valve 19 and the second pneumatic adjusting valve 23 are electrically connected to the control background; the second cooling pipe 18 is provided with a fourth electrically operated valve 20, and the fourth electrically operated valve 20 is electrically connected to the control background. The third electric valve 19 is used for isolating the outlet of the booster pump, and the booster pump is closed before being started, so that the instantaneous starting safety of the pump and the system isolation during maintenance of the booster pump and the cooler are ensured. The pipe pump 21 boosts the condensed water to enter the cooler 16, overcomes the system resistance, and ensures that the condensed water at the outlet of the cooler 16 has enough pressure to flow into the outlet condensed water main pipe of the #7 low-pressure heater. The second manual valve 22 is used to close the isolation for servicing equipment, such as booster pumps, coolers, etc. The second pneumatic regulator valve 23 acts to regulate the flow of condensate into the cooler to achieve accurate control of the shaft seal overflow steam temperature. The condensed water with the lower temperature of 30-45 ℃ enters the water pipeline 161 of the cooler 16 through the first cooling pipeline 17 under the action of the pipeline pump 21, at this time, high-temperature steam is gathered in the steam chamber 162, the high-temperature steam exchanges heat with the low-temperature condensed water in the water pipeline 161, the steam temperature in the steam chamber 162 is reduced after the heat exchange, and the temperature of the condensed water in the water pipeline 161 is increased. The heated condensed water flows into the outlet condensed water main pipe of the #7 low-pressure heater through the second cooling pipeline 18, the temperature range is 95-120 ℃, and the water temperature requirement of the condensed water is met. In addition, the steam after temperature reduction in the steam chamber 162 enters one or more devices of a #8 low-pressure heater or a condenser through the third section of the main pipeline 3.
Example 2: as shown in fig. 1 and 2, a shaft seal steam supply system with a cooling device comprises a third section of main pipeline 3, a cooler 16, a first section of main pipeline 1, a first temperature reduction device 6 and a second section of main pipeline 2 which are connected in sequence, wherein the cooler 16 is also connected with a cooling pipeline, and condensed water flows into the cooler 16 from one end of the cooling pipeline, is heated and then flows out of a condensed water main pipe of an outlet of a #7 low-pressure heater from the cooling pipeline; the first temperature reduction device 6 is also connected with one end of the first temperature reduction pipeline 4, and condensed water flows in from the other end of the first temperature reduction pipeline 4; wherein, the first section main pipeline 1 is respectively connected with a high pressure cylinder main steam valve rod, a high pressure cylinder regulating valve rod, a middle pressure cylinder main steam valve rod, a middle pressure cylinder regulating valve rod, a high pressure cylinder front and rear shaft seal, a middle pressure cylinder front and rear shaft seal and a steam feed pump steam turbine front shaft seal through branches; wherein, the second section of main pipeline 2 is respectively connected with a low pressure cylinder shaft seal and a steam turbine rear shaft seal of a steam feed pump through a branch; wherein the third section of main pipeline 3 is respectively connected with a #8 low-pressure heater and a condenser through a branch. The utility model discloses a condensate water cools off bearing seal overflow steam, adopt the condensate water direct cooling and set up the mode of the indirect heat transfer of cooler, the flow size according to bearing seal overflow steam realizes the desuperheating regulation of condensate water counter shaft seal overflow steam, reduce the loss of #8 low pressure feed water heater tube bank, extension # 8 low pressure feed water heater's life, reduce the unusual scheduling problem of #8 low pressure feed water heater water level that arouses because of the heat exchange tube leakage of inside, still provide the condensate water after heaing up for the export of #7 low pressure feed water heater simultaneously, satisfy its operation requirement. Further, the shaft seal steam supply system with the cooling device further comprises a first control system 9, a third control system 11 and a control background, wherein the first control system 9 and the third control system 11 are electrically connected to the control background. Wherein the first control system 9 is arranged on the first desuperheating pipeline 4, and the third control system 11 is arranged on one side of the first section of the main pipeline 1 close to the cooler 16. The first section of main pipeline 1, the first temperature-reducing pipeline 4 and each device are respectively provided with a temperature sensor, a pressure sensor and other devices, and the temperature sensor, the pressure sensor and other devices are in signal connection with the control background. And sending a signal after the background is controlled to analyze information such as temperature and pressure, so that the opening and closing or opening of the first control system 9 and the third control system 11 are controlled, parameters such as condensate flow and the like are adjusted, and accordingly the temperature reduction adjustment of the condensate on the shaft seal overflow steam is realized. Specifically, the control background may be a DCS system. Further, a filtering device 8 is further arranged on the first temperature reduction pipeline 4, and the filtering device 8 is located between the first temperature reduction device 6 and the first control system 9. Because the low-pressure cylinder has higher requirement on the cleanliness of flowing steam and the like, the first desuperheating pipeline 4 is also provided with the filtering device 8 for purifying flowing condensed water and ensuring the cleanliness of the mixed steam in the second section of the main pipeline 2, thereby meeting the operation requirement of the low-pressure cylinder. Specifically, the filtering device 8 includes a fourth manual valve a81, a fourth manual valve B82, a fourth manual valve C83, a strainer 84, and a fourth bypass 85, wherein the fourth manual valve a81, the strainer 84, and the fourth manual valve B82 are sequentially installed on the first desuperheating pipeline 4 along the flowing direction of the condensed water; both ends of the fourth bypass 85 are communicated with the first temperature reduction pipeline 4, wherein a first node of the fourth bypass 85 communicated with the first temperature reduction pipeline 4 is positioned at one side of the fourth manual valve A81 close to the first control system 9, and a second node of the fourth bypass 85 communicated with the first temperature reduction pipeline 4 is positioned at one side of the fourth manual valve B82 close to the first temperature reduction device 6; the fourth bypass 85 is provided with a fourth manual valve C83. In a normal state, the fourth manual valve A81 and the fourth manual valve B82 are manually adjusted to be in an open state, the fourth manual valve C83 is manually adjusted to be in a closed state, at the moment, the fourth bypass 85 is disconnected, and the condensed water flows through the first temperature-reducing pipeline 4, the fourth manual valve A81, the filter screen 84 and the fourth manual valve B82, is purified and then enters the first temperature-reducing device 6 to be cooled. If the screen 84 needs to be repaired or replaced, the fourth manual valve a81 and the fourth manual valve B82 may be manually adjusted to the closed state, and the fourth manual valve C83 may be manually adjusted to the open state, and the fourth bypass 85 may be a backup path.
Example 3: as shown in fig. 1 and 2, a shaft seal steam supply system with a cooling device comprises a third section of main pipeline 3, a cooler 16, a first section of main pipeline 1, a first temperature reduction device 6 and a second section of main pipeline 2 which are connected in sequence, wherein the cooler 16 is also connected with a cooling pipeline, and condensed water flows into the cooler 16 from one end of the cooling pipeline, is heated and then flows out of a condensed water main pipe of an outlet of a #7 low-pressure heater from the cooling pipeline; the first temperature reduction device 6 is also connected with one end of the first temperature reduction pipeline 4, and condensed water flows in from the other end of the first temperature reduction pipeline 4; wherein, the first section main pipeline 1 is respectively connected with a high pressure cylinder main steam valve rod, a high pressure cylinder regulating valve rod, a middle pressure cylinder main steam valve rod, a middle pressure cylinder regulating valve rod, a high pressure cylinder front and rear shaft seal, a middle pressure cylinder front and rear shaft seal and a steam feed pump steam turbine front shaft seal through branches; wherein, the second section of main pipeline 2 is respectively connected with a low pressure cylinder shaft seal and a steam turbine rear shaft seal of a steam feed pump through a branch; wherein the third section of main pipeline 3 is respectively connected with a #8 low-pressure heater and a condenser through a branch. The utility model discloses a condensate water cools off bearing seal overflow steam, adopt the condensate water direct cooling and set up the mode of the indirect heat transfer of cooler, the flow size according to bearing seal overflow steam realizes the desuperheating regulation of condensate water counter shaft seal overflow steam, reduce the loss of #8 low pressure feed water heater tube bank, extension # 8 low pressure feed water heater's life, reduce the unusual scheduling problem of #8 low pressure feed water heater water level that arouses because of the heat exchange tube leakage of inside, still provide the condensate water after heaing up for the export of #7 low pressure feed water heater simultaneously, satisfy its operation requirement.
Furthermore, a first electric valve 12 is further installed on a branch of the third-section main pipeline 3 connected with the #8 low-pressure heater, a second electric valve 13 is further installed on a branch of the third-section main pipeline 3 connected with the condenser, and the first electric valve 12 and the second electric valve 13 are both electrically connected to the control background. The first electric valve 12 and the second electric valve 13 are controlled by the control background to be in an on state and an off state, so that steam released from the first section of the main pipeline 1 and cooled by the cooler 16 can enter one of a #8 low-pressure heater and a condenser.
Or, the shaft seal steam supply system with the cooling device further comprises an auxiliary steam system 14, a steam supply regulating valve 15 and an auxiliary steam pipeline, wherein one end of the auxiliary steam pipeline is communicated with the first section of the main pipeline 1, the other end of the auxiliary steam pipeline is communicated with the auxiliary steam system 14, and the auxiliary steam pipeline is provided with the steam supply regulating valve 15; wherein the steam supply regulating valve 15 is electrically connected to the control background. The auxiliary steam system 14 and the auxiliary steam pipeline are used as standby steam sources, and the opening degree of the auxiliary steam pipeline is controlled through the steam supply regulating valve 15, so that the steam turbine can automatically keep the steam pressure set in the steam supply main pipes of the first section of main pipeline 1, the second section of main pipeline 2, the third section of main pipeline 3 and the like under any operation working condition.
Or, the first control system 9 includes a first manual valve a91, a first manual valve B92, a first manual valve C93, a first pneumatic adjusting valve a94, and a first bypass 95, wherein the first pneumatic adjusting valve a94 is electrically connected to the control background; wherein the first manual valve A91, the first pneumatic adjusting valve A94 and the first manual valve B92 are sequentially arranged on the first temperature-reducing pipeline 4 along the flowing direction of the condensed water; both ends of the first bypass 95 are communicated with the first temperature-reducing pipeline 4, wherein a first node of the first bypass 95 communicated with the first temperature-reducing pipeline 4 is positioned at one side of the first manual valve A91 far away from the first pneumatic regulating valve A94, and a second node of the first bypass 95 communicated with the first temperature-reducing pipeline 4 is positioned at one side of the first manual valve B92 far away from the first pneumatic regulating valve A94; the first bypass 95 is provided with a first manual valve C93. The first pneumatic regulating valve A94 regulates the amount of the temperature-reduced water, and further controls the stability of the steam. Under the normal operating mode, with first manual valve A91, first manual valve B92 manual regulation to the state of opening, with first manual valve C93 manual regulation to the state of closing simultaneously, first bypass 95 disconnection this moment, work such as the condensate water gets into first attemperator 6 completion attemperation regulation through first attemperator 4, according to the temperature demand in the pipeline, the control backstage can send control signal real-time regulation first pneumatic regulating valve A94's aperture. If the first pneumatic adjusting valve a94 breaks down, the first manual valve a91 and the first manual valve B92 can be closed for maintenance, and at this time, the first manual valve C93 is manually opened, so that the first bypass 95 is communicated to serve as a standby pipeline to continue working.
Or, the third control system 11 includes a third manual valve 111, a third pneumatic regulating valve 112, and a third bypass 113, where the third pneumatic regulating valve 112 is installed on the first section of main pipeline 1 and electrically connected to the control background; both ends of the third bypass 113 are communicated with the first section of main pipeline 1, wherein a first node of the third bypass 113 communicated with the first section of main pipeline 1 is positioned on one side of the third pneumatic regulating valve 112 close to the cooler 16, and a second node of the third bypass 113 communicated with the first section of main pipeline 1 is positioned on one side of the third pneumatic regulating valve 112 far away from the cooler 16; the third bypass 113 is provided with a third manual valve 111. Under the normal operating condition, the third manual valve 111 is manually adjusted to be in a closed state, at the moment, the third bypass 113 is disconnected, steam flows through the third pneumatic adjusting valve 112 through the first section of the main pipeline 1 and enters the cooler 16 for cooling, and the control background can send out a control signal to adjust the opening of the third pneumatic adjusting valve 112 in real time according to the pressure requirement in the pipeline. The third pneumatic regulating valve 112 regulates the steam pressure in the steam supply main pipe formed by the first section of main pipe 1 and the second section of main pipe 2. If the third pneumatic adjusting valve 112 fails, the third manual valve 111 is manually opened to connect the third bypass 113 to continue to operate as a backup line.
Example 4: as shown in fig. 1 and 2, a shaft seal steam supply system with a cooling device comprises a third section of main pipeline 3, a cooler 16, a first section of main pipeline 1, a first temperature reduction device 6 and a second section of main pipeline 2 which are connected in sequence, wherein the cooler 16 is also connected with a cooling pipeline, and condensed water flows into the cooler 16 from one end of the cooling pipeline, is heated and then flows out of a condensed water main pipe of an outlet of a #7 low-pressure heater from the cooling pipeline; the first temperature reduction device 6 is also connected with one end of the first temperature reduction pipeline 4, and condensed water flows in from the other end of the first temperature reduction pipeline 4; wherein, the first section main pipeline 1 is respectively connected with a high pressure cylinder main steam valve rod, a high pressure cylinder regulating valve rod, a middle pressure cylinder main steam valve rod, a middle pressure cylinder regulating valve rod, a high pressure cylinder front and rear shaft seal, a middle pressure cylinder front and rear shaft seal and a steam feed pump steam turbine front shaft seal through branches; wherein, the second section of main pipeline 2 is respectively connected with a low pressure cylinder shaft seal and a steam turbine rear shaft seal of a steam feed pump through a branch; wherein the third section of main pipeline 3 is respectively connected with a #8 low-pressure heater and a condenser through a branch. The utility model discloses a condensate water cools off bearing seal overflow steam, adopt the condensate water direct cooling and set up the mode of the indirect heat transfer of cooler, the flow size according to bearing seal overflow steam realizes the desuperheating regulation of condensate water counter shaft seal overflow steam, reduce the loss of #8 low pressure feed water heater tube bank, extension # 8 low pressure feed water heater's life, reduce the unusual scheduling problem of #8 low pressure feed water heater water level that arouses because of the heat exchange tube leakage of inside, still provide the condensate water after heaing up for the export of #7 low pressure feed water heater simultaneously, satisfy its operation requirement. The first temperature reducing device 6 is a water spraying and atomizing nozzle, wherein the first temperature reducing device 6 is arranged in the first section of the main pipeline 1. The condensed water is sprayed on the surface of the steam in an atomized state, so that the cooling effect is achieved.
The working process is as follows: the steam seal system of the unit adopts a self-sealing steam seal system, namely, when the unit operates normally under high load, the steam leakage of the main steam valve rod of the high and medium pressure cylinders of the unit and the steam leakage of the regulating valve rod are used as the steam seal system of the low pressure cylinder after the temperature reduction by water spraying, and the redundant steam leakage overflows to a #8 low pressure heater or a condenser through a third control system 11. When the unit is under low load, when the front and rear shaft seals of the high and middle pressure cylinders leak steam, the main steam valve rod leaks steam and the regulating valve rod leaks steam and can not meet the requirement of shaft seal steam supply, the auxiliary steam system 14 supplies steam to the steam supply main pipes of the first section of main pipeline 1, the second section of main pipeline 2 and the like, and the steam pressure in the steam supply main pipes is kept stable and meets the requirement. The utility model discloses under the different load operating mode of unit, the operating pressure of equipment such as bearing seal, steam feed pump steam turbine front shaft seal, low pressure jar bearing seal, steam feed pump steam turbine rear shaft seal around bearing seal, the middle pressure jar main steam valve rod, middle pressure jar governing valve rod, the high pressure jar main steam valve rod, the middle pressure jar governing valve rod, the high pressure jar is changed. Because the fluid self characteristics, flow from high pressure to low pressure automatically, guarantee accurate outflow, accurate entering. Under all operating conditions of the steam turbine, steam supply pressure is controlled through the steam supply regulating valve 15 of the auxiliary steam, so that the steam turbine automatically keeps the steam pressure set in the steam supply main pipe consisting of the first section of main pipeline 1 and the second section of main pipeline 2 under any operating condition. In order to meet the requirement of the steam supply temperature of the shaft seal of the low-pressure cylinder, a first temperature reduction device 6 is arranged on the second section of main pipeline 2, and the water spray quantity of the first temperature reduction device is controlled by a first control system 9, so that the steam after temperature reduction meets the requirement of the steam supply of the shaft seal of the low-pressure cylinder. Unnecessary leak steam is when the third control system 11 overflows to #8 low pressure feed water heater or condenser, because of overflow steam is far above #8 low pressure feed water heater design allowable value, so the utility model discloses adopt behind third control system 11 and install a steam cooler 16's mode additional, overflow steam enters steam cooler 16 behind third control system 11, after the cooling water heat transfer cooling, satisfies #8 low pressure feed water heater's allowable temperature requirement. The cooling water source of cooler 16 is taken from the female pipe of condensate polishing export, steps up through tubing pump 21, realizes that 16 export cooling water pressure of cooler satisfies the needs that get into #7 low and add the female pipe of export condensate, through the control of the pneumatic adjusting valve of second 23 of tubing pump 21 export, carries out accurate control to the cooling water flow that gets into cooler 16, realizes the control to the accurate cooling of the steam that gets into cooler 16. The utility model discloses electric valve, adjusting valve, tubing pump that contain all can realize the long-range centralized control through the control backstage (can be DCS system).
Claims (10)
1. The shaft seal steam supply system with the cooling device is characterized by comprising a third section of main pipeline (3), a cooler (16), a first section of main pipeline (1), a first temperature reduction device (6) and a second section of main pipeline (2) which are sequentially connected, wherein the cooler (16) is also connected with a cooling pipeline, and condensed water flows into the cooler (16) from one end of the cooling pipeline and is heated and then flows out of a condensed water main pipe of an outlet of a #7 low-pressure heater from the cooling pipeline; the first temperature reduction device (6) is also connected with one end of a first temperature reduction pipeline (4), and condensed water flows in from the other end of the first temperature reduction pipeline (4);
wherein, the first section of main pipeline (1) is respectively connected with a high pressure cylinder main steam valve rod, a high pressure cylinder regulating valve rod, a middle pressure cylinder main steam valve rod, a middle pressure cylinder regulating valve rod, a high pressure cylinder front and rear shaft seal, a middle pressure cylinder front and rear shaft seal and a steam feed pump steam turbine front shaft seal through branches;
wherein, the second section of main pipeline (2) is respectively connected with a low pressure cylinder shaft seal and a steam turbine rear shaft seal of a steam feed pump through a branch;
wherein the third section of main pipeline (3) is respectively connected with a #8 low-pressure heater and a condenser through a branch.
2. The shaft seal steam supply system with the cooling device according to claim 1, further comprising a first control system (9), a third control system (11) and a control background, wherein the first control system (9) and the third control system (11) are electrically connected to the control background;
the first control system (9) is arranged on the first temperature-reducing pipeline (4), and the third control system (11) is arranged on one side, close to the cooler (16), of the first section of main pipeline (1).
3. A shaft seal steam supply system with a cooling device according to claim 2, characterized in that the cooling duct comprises a first cooling duct (17) and a second cooling duct (18); a water pipeline (161) and a steam chamber (162) are arranged in the cooler (16), an inlet and an outlet are formed in the surface of the steam chamber (162), the inlet of the steam chamber (162) is communicated with the end part of the first section of main pipeline (1), and the outlet of the steam chamber (162) is communicated with the end part of the third section of main pipeline (3); the water inlet side of the water pipeline (161) is connected with the end part of the first cooling pipeline (17), and condensed water flows in from the other end of the first cooling pipeline (17); the water outlet side of the water pipeline (161) is connected with the end part of a second cooling pipeline (18), and the other end of the second cooling pipeline (18) is connected to a #7 low-pressure heater outlet condensed water main pipe;
a second manual valve (22), a pipeline pump (21), a third electric valve (19) and a second pneumatic adjusting valve (23) are sequentially arranged on the first cooling pipeline (17) along the flowing direction of the condensed water, wherein the third electric valve (19) and the second pneumatic adjusting valve (23) are electrically connected to the control background;
the second cooling pipeline (18) is provided with a fourth electric valve (20), and the fourth electric valve (20) is electrically connected to the control background.
4. Shaft seal steam supply system with a cooling device according to claim 2, characterized in that the first desuperheating pipeline (4) is further provided with a filtering device (8), and the filtering device (8) is located between the first desuperheating device (6) and the first control system (9).
5. The shaft seal steam supply system with the cooling device according to claim 4, characterized in that the filtering device (8) comprises a fourth manual valve A (81), a fourth manual valve B (82), a fourth manual valve C (83), a strainer (84) and a fourth bypass (85), wherein the fourth manual valve A (81), the strainer (84) and the fourth manual valve B (82) are sequentially arranged on the first temperature-reducing pipeline (4) along the flowing direction of the condensed water;
both ends of a fourth bypass (85) are communicated with the first temperature reduction pipeline (4), wherein a first node of the fourth bypass (85) communicated with the first temperature reduction pipeline (4) is positioned on one side, close to the first control system (9), of the fourth manual valve A (81), and a second node of the fourth bypass (85) communicated with the first temperature reduction pipeline (4) is positioned on one side, close to the first temperature reduction device (6), of the fourth manual valve B (82);
the fourth bypass (85) is provided with a fourth manual valve C (83).
6. The shaft seal steam supply system with the cooling device according to claim 2, wherein a first electrically operated valve (12) is further installed on a branch of the third section of the main pipeline (3) connected with the #8 low-pressure heater, a second electrically operated valve (13) is further installed on a branch of the third section of the main pipeline (3) connected with the condenser, and both the first electrically operated valve (12) and the second electrically operated valve (13) are electrically connected to the control background.
7. The shaft seal steam supply system with the cooling device according to claim 2, further comprising an auxiliary steam system (14), a steam supply regulating valve (15), and an auxiliary steam pipeline, wherein one end of the auxiliary steam pipeline is communicated with the first section of the main pipeline (1), the other end of the auxiliary steam pipeline is communicated with the auxiliary steam system (14), and the auxiliary steam pipeline is provided with the steam supply regulating valve (15); wherein the steam supply regulating valve (15) is electrically connected with the control background.
8. The shaft seal steam supply system with the cooling device according to claim 2, wherein the first control system (9) comprises a first manual valve A (91), a first manual valve B (92), a first manual valve C (93), a first pneumatic regulating valve A (94) and a first bypass (95), and the first pneumatic regulating valve A (94) is electrically connected to the control background;
wherein the first manual valve A (91), the first pneumatic regulating valve A (94) and the first manual valve B (92) are sequentially arranged on the first temperature-reducing pipeline (4) along the flowing direction of the condensed water;
two ends of the first bypass (95) are communicated with the first temperature-reducing pipeline (4), wherein a first node of the first bypass (95) communicated with the first temperature-reducing pipeline (4) is positioned on one side, away from the first pneumatic regulating valve A (94), of the first manual valve A (91), and a second node of the first bypass (95) communicated with the first temperature-reducing pipeline (4) is positioned on one side, away from the first pneumatic regulating valve A (94), of the first manual valve B (92);
the first bypass (95) is provided with a first manual valve C (93).
9. The shaft seal steam supply system with the cooling device according to claim 2, characterized in that the third control system (11) comprises a third manual valve (111), a third pneumatic regulating valve (112) and a third bypass (113), wherein the third pneumatic regulating valve (112) is installed on the first section of the main pipeline (1) and is electrically connected with the control background;
both ends of the third bypass (113) are communicated with the first section of main pipeline (1), wherein a first node for communicating the third bypass (113) with the first section of main pipeline (1) is positioned on one side, close to the cooler (16), of the third pneumatic regulating valve (112), and a second node for communicating the third bypass (113) with the first section of main pipeline (1) is positioned on one side, far away from the cooler (16), of the third pneumatic regulating valve (112);
the third bypass (113) is provided with a third manual valve (111).
10. Shaft seal steam supply system with cooling device according to claim 1, characterized in that the first temperature reducing device (6) is a water spray atomizer, wherein the first temperature reducing device (6) is placed in the first section of the main pipeline (1).
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| CN201921258703.9U CN210768936U (en) | 2019-08-05 | 2019-08-05 | Shaft seal steam supply system with cooling device |
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| CN114109531A (en) * | 2020-08-27 | 2022-03-01 | 上海电气电站设备有限公司 | Cooler and cooling method |
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