CN209908575U - Steam turbine shaft seal steam source switching system and steam turbine generator set - Google Patents
Steam turbine shaft seal steam source switching system and steam turbine generator set Download PDFInfo
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- CN209908575U CN209908575U CN201920338908.1U CN201920338908U CN209908575U CN 209908575 U CN209908575 U CN 209908575U CN 201920338908 U CN201920338908 U CN 201920338908U CN 209908575 U CN209908575 U CN 209908575U
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- 238000001514 detection method Methods 0.000 claims description 50
- 238000009529 body temperature measurement Methods 0.000 claims description 2
- 238000010248 power generation Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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Abstract
The utility model discloses a steam turbine bearing seal vapour source switched systems and steam turbine generating set, including main control unit, cold controling unit again, first stage assist vapour the control unit, temperature detecting element and flow detecting element, through setting up cold controling unit again, first stage assist vapour the control unit, main control unit, temperature detecting element and flow detecting element, through main control unit control cold controling unit again, first stage assist vapour the control unit gradually with the steam turbine vapour source by cold steam switching for the assistance vapour of first stage unit again. Compared with the prior art, the utility model has the characteristics of simple structure, it is easy and simple to handle.
Description
Technical Field
The utility model belongs to the technical field of steam turbine equipment and specifically relates to a steam turbine bearing seal vapour source switched systems and steam turbine generating set are related to.
Background
In recent years, the economic acceleration of market depression is slowed down, the power plant unit often faces the double-unit outage condition, if the last unit outage or the single-unit operation failure outage, the auxiliary steam pressure is switched by the shaft seal steam sources with two different levels of pressure, the temperature is easy to change sharply when the shaft seal steam source is suddenly switched from cold to auxiliary steam in one period, and if the temperature is lower than the temperature (200 ℃) standard of 50% of the high-pressure rotor, the shaft seal is severely shrunk and the large shaft of the steam turbine is locked, so that the safety of the steam turbine is affected.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's shortcoming and not enough, provide a make the unit switch over the steam turbine bearing seal vapour source switched systems and steam turbine generating set of bearing seal vapour source gently.
The utility model discloses a realize through following technical scheme: a steam source switching system of a steam turbine shaft seal comprises a cold re-control unit, a first-stage auxiliary steam control unit, a main control unit, a temperature detection unit and a flow detection unit, wherein the main control unit is electrically connected with the cold re-control unit, the first-stage auxiliary steam control unit, the temperature detection unit and the flow detection unit respectively and controls the operation of the units;
the system comprises a cold re-control unit, a first-stage auxiliary steam control unit, a temperature detection unit, a flow detection unit and a main control unit, wherein the cold re-control unit controls cold re-steam to enter an auxiliary steam header, the first-stage auxiliary steam control unit controls first-stage auxiliary steam to enter a second-stage auxiliary steam header, the temperature detection unit collects the temperature of a shaft seal of a steam turbine, and the flow detection unit detects the steam flow sent to the second-stage auxiliary steam header by a first-stage auxiliary steam inlet pipeline and feeds the steam flow.
Compared with the prior art, the utility model discloses a set up cold control unit, first stage and assist vapour the control unit, main control unit, temperature detecting element and flow detection unit again, assist vapour the control unit gradually with the steam turbine steam source by cold steam switching for the supplementary vapour of first stage unit through main control unit control cold control unit, first stage, make the gentle switching of steam turbine bearing seal steam source, realize the gentle outage of unit.
Furthermore, the temperature detection unit adopts a temperature sensor with the temperature measurement range of 100-500 degrees, so that the accuracy of the detection effect of the shaft seal temperature is ensured.
Further, still include the pressure detection unit that detects the inside vapour pressure of vapour header is assisted to the second phase, pressure detection unit with main control unit connects, and the vapour pressure in the guarantee second phase is assisted the vapour header and is maintained in certain extent.
Furthermore, the steam drainage system also comprises a water drainage control unit for controlling the opening and closing of at least two water drainage wells, wherein the water drainage control unit is connected with the main control unit to ensure that auxiliary steam is supplied for the first time to meet the steam requirement.
The steam turbine shaft seal temperature warning device further comprises an LED lamp unit for prompting the temperature of the steam turbine shaft seal, the LED lamp unit is connected with the control unit, and the LED lamp has a warning effect.
Furthermore, the flow detection unit detects the steam flow sent to the second-stage auxiliary steam header by the first-stage auxiliary steam inlet pipeline through the flow meter, and controls the cold re-control unit to stop outputting cold re-steam according to the steam flow detected by the flow meter.
Furthermore, the cold re-control unit adopts an electric valve, an adjusting valve and a manual valve to control the cold re-steam to enter the second-stage auxiliary steam header, and the first-stage auxiliary steam control unit adopts two electric valves to control the first-stage auxiliary steam to enter the second-stage auxiliary steam header, so that the control is convenient, and the sealing performance after the separation is ensured.
Further, still including the supplementary vapour deoxidization unit of control auxiliary vapour confession oxygen-eliminating device switching, supplementary vapour deoxidization unit with main control unit connects, prevents that oxygen and steam from combining the corruption turbine unit equipment.
The invention also includes a steam turbine generator set comprising: the steam turbine shaft seal steam source switching system of claim 1, and the first stage unit, the second stage unit, each include: the steam provided by the auxiliary steam header is heated by the electric heater and then supplied to the high-pressure cylinder, the intermediate-pressure cylinder, the first low-pressure cylinder and the second low-pressure cylinder for power generation;
the shaft seal steam source switching system comprises a main control unit, a cold re-control unit, a first-stage auxiliary steam control unit, a temperature detection unit and a flow detection unit, wherein the main control unit, the cold re-control unit, the first-stage auxiliary steam control unit and the flow detection unit are arranged on a second-stage unit auxiliary steam header, and the temperature detection unit is arranged in a first low-pressure cylinder chamber of the unit.
Compared with the prior art, the steam turbine generator set gradually switches the steam source of the steam turbine from cold to steam to auxiliary steam of the first-stage set through the steam source switching system of the steam turbine shaft seal, so that the steam source of the steam turbine shaft seal is smoothly switched, and the unit is smoothly shut down.
Furthermore, a first-stage auxiliary steam inlet pipeline and a cold re-steam inlet pipeline are respectively arranged on an auxiliary steam header on the second-stage unit, the first-stage auxiliary steam inlet pipeline is connected with a first-stage auxiliary steam source, and two electric valves are arranged on the first-stage auxiliary steam inlet pipeline and are controlled by a first-stage auxiliary steam control unit; the cold re-steam inlet pipeline is connected with a cold re-steam source, the cold re-steam inlet pipeline is sequentially provided with an electric valve, an adjusting valve and a manual valve, the electric valve, the adjusting valve and the manual valve are controlled by a cold re-control unit, and the two kinds of steam from different sources are better isolated by arranging a plurality of valves.
For a better understanding and an implementation, the present invention is described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of a control unit of a steam source switching system of a steam turbine shaft seal according to embodiment 1 of the present invention;
fig. 2 is a schematic structural view of a turbo generator set in embodiment 2 of the present invention;
fig. 3 is a schematic structural view of the secondary unit auxiliary steam header 2 in embodiment 2 of the present invention;
fig. 4 is a schematic structural view of the drainage wells 261 and 262 in example 2 of the present invention;
fig. 5 is an auxiliary steam temperature curve 1 obtained by switching steam sources in embodiment 2 of the present invention;
fig. 6 is an auxiliary steam temperature curve 2 obtained by switching steam sources in embodiment 2 of the present invention;
Detailed Description
Example 1
Please refer to fig. 1, which is a schematic structural diagram of a steam source switching system of a steam turbine shaft seal according to an embodiment of the present invention. The steam turbine shaft seal steam source switching system comprises a main control unit 200, a cold re-control unit 210, a first-stage auxiliary steam control unit 220, a temperature detection unit 230 and a flow detection unit 240, wherein the main control unit 200 is controlled by a PLC (programmable logic controller), the main control unit 200 is respectively electrically connected with the cold re-control unit 210, the first-stage auxiliary steam control unit 220, the temperature detection unit 230 and the flow detection unit 240, and the operation of the units is controlled.
In this embodiment, when the existing first-stage unit and second-stage unit are operating normally, the shaft seal steam source of the second-stage steam turbine unit is supplied by auxiliary steam, the second-stage auxiliary steam header is connected to the cold re-steam inlet pipeline and the first-stage auxiliary steam inlet pipeline, and the auxiliary steam header is normally supplied to the second-stage auxiliary steam header from the unit cold re-steam source through the cold re-steam inlet pipeline.
The cold re-control unit 210 is arranged on the cold re-steam inlet pipeline and used for controlling cold re-steam to enter the auxiliary steam header; the first-stage auxiliary steam control unit 220 is arranged on the first-stage auxiliary steam inlet pipeline and is used for controlling first-stage auxiliary steam to enter the second-stage auxiliary steam header, in this embodiment, the cold re-control unit 210 controls the electric valve, the adjusting valve and the manual valve to control cold re-steam to enter the second-stage auxiliary steam header, the 220 electric valves of the first-stage auxiliary steam control unit control first-stage auxiliary steam to enter the second-stage auxiliary steam header, and the valves are all in an open state initially.
The temperature detection unit 230 is arranged in the shaft seal cavity of the low-pressure cylinder of the steam turbine, so that the steam temperature of the shaft seal cavity of the low-pressure cylinder of the steam turbine can be conveniently and accurately acquired; preferably, the temperature detecting unit 230 uses a temperature sensor, such as a thermocouple or an RTD resistor, with a temperature measuring range of 100 ° to 500 ° to ensure the accuracy of the detection effect of the shaft seal temperature. In one embodiment, the temperature sensor can be a plurality of temperature sensors, and the temperature sensors can be distributed along the circumferential direction of the annular shaft seal chamber, so that the measurement accuracy is improved.
The flow detection unit 240 detects the steam flow sent to the second-stage auxiliary steam header by the first-stage auxiliary steam inlet pipeline and feeds the steam flow back to the main control unit 200, preferably, the flow detection unit 240 detects the steam flow sent to the second-stage auxiliary steam header by the first-stage auxiliary steam inlet pipeline by using a flow meter, and controls the cold re-control unit 2 to stop outputting cold re-steam according to the steam flow detected by the flow meter.
In one embodiment, the steam drainage system further comprises a water drainage control unit 250 for controlling the opening and closing of at least two water drainage wells arranged on the first-stage auxiliary steam inlet pipeline, wherein the water drainage control unit 250 is controlled by an electric stop valve, the electric stop valve is connected with the main control unit 200, and the water drainage control unit 250 is used for draining water to ensure that the first-stage auxiliary steam supply meets the steam requirement.
In one embodiment, the steam pressure detection unit 260 is further included for detecting the steam pressure inside the secondary auxiliary steam header, the pressure detection unit 260 may adopt an electric contact pressure gauge with a model number of YXC-150, and the electric contact pressure gauge is connected with the main control unit 200 to ensure that the steam pressure inside the secondary auxiliary steam header is maintained within a certain range.
In one embodiment, the steam turbine shaft seal temperature warning device further comprises an LED lamp unit 270 for prompting the temperature of the steam turbine shaft seal, the LED lamp unit 270 comprises a buzzer and an LED lamp, and the LED lamp unit 8 is connected with the main control unit 1 and plays a role in warning when the temperature of the shaft seal is too high.
In one embodiment, the steam turbine further comprises an auxiliary steam deaerating unit 280 for controlling the opening and closing of an auxiliary steam supply deaerator, preferably, the auxiliary steam deaerator can be a thermal deaerator, and the auxiliary steam deaerating unit 280 is connected with the main control unit 200 to prevent oxygen and steam from combining to corrode the steam turbine set equipment.
When the second-stage unit normally operates, the adjusting valves of the intercooling re-control unit 210 and the first-stage auxiliary steam control unit 220 are both in an open state, and because the pressure of the cold re-steam source is higher than that of the first-stage auxiliary steam, the second-stage auxiliary steam header is equivalent to only supplying cold re-steam source. In the steam source switching process, the minimum requirements on the pressure in the auxiliary steam header and the shaft seal temperature are 0.6MPa and 214.5 degrees (50 degrees of superheat).
When the last unit in the second stage is stopped, a small steam source is maintained to be supplied by the auxiliary steam header, the auxiliary steam deaerating unit is controlled by the main control unit to start the auxiliary steam supply deaerator in advance, at least two dewatering wells arranged on the auxiliary steam inlet pipeline in the first stage are controlled by the dewatering control unit to start dewatering, and the auxiliary steam supply in the first stage is ensured to meet the steam requirement; and then the cold re-control unit controls the cold re-valve of the turn-down unit step by step, the flow detection unit strictly monitors the change of the auxiliary steam flow meter for the first period and the second period, when the change of the flow meter value is detected, the fact that the auxiliary steam for the first period supplies steam to the auxiliary steam header for the second period is indicated, the temperature detection unit strictly monitors the change of the temperature of the shaft seal, the pressure detection unit strictly monitors the change of the pressure in the auxiliary steam header for the second period, and the main control unit controls the cold re-control unit to turn down the cold re-valve step by step according to the pressure of the auxiliary steam header for the first period and the result of the temperature. After the flowmeter displays that the steam inlet amount of the auxiliary steam in the first period reaches 15t/h flow, the shaft seal steam source is considered to be switched from cold re-steam to the auxiliary steam in the first period, the main control unit controls the cold re-control unit to close the cold re-valve until the cold re-valve is closed, and the switching of the auxiliary steam source is completed.
Example 2
As shown in fig. 2, the present invention also includes a steam turbine generator set comprising: the steam turbine shaft seal steam source switching system comprises a first-stage unit, a second-stage unit and the steam turbine shaft seal steam source switching system according to embodiment 1, wherein the first-stage unit and the second-stage unit are the same and respectively comprise: main controller 1, assist vapour header 2, electric heater 3, high-pressure cylinder 4, intermediate pressure cylinder 5, first low pressure cylinder 6 and second low pressure cylinder 7, main controller 1 respectively with assist vapour header 2, electric heater 3, high-pressure cylinder 4, intermediate pressure cylinder 5, first low pressure cylinder 6 and second low pressure cylinder 7 are connected, assist vapour header 2 and electric heater 3 and pass through the pipe connection, connect gradually between high-pressure cylinder 4, intermediate pressure cylinder 5, first low pressure cylinder 6 and the second low pressure cylinder 7, assist the steam that vapour header 2 provided and supply with high-pressure cylinder 4, intermediate pressure cylinder 5, first low pressure cylinder 6 and second low pressure cylinder 7 respectively after heating through electric heater 3 and be used for the electricity generation.
The shaft seal steam source switching system comprises a main control unit 200, a cold re-control unit 210, a first-stage auxiliary steam control unit 220, a temperature detection unit 230 and a flow detection unit 240, wherein the main control unit 200, the cold re-control unit 210, the first-stage auxiliary steam control unit 220 and the flow detection unit 240 are arranged on a second-stage unit auxiliary steam header 2, and the temperature detection unit 230 is arranged in a chamber of a first low-pressure cylinder 6 of a unit.
As shown in fig. 3-4, the auxiliary steam header 2 of the second-stage unit is provided with a cold re-steam inlet pipe 21 and a first-stage auxiliary steam inlet pipe 22.
The cold re-steam inlet pipeline 21 is connected with a cold re-steam source, an electric valve 211, an adjusting valve 212 and a manual valve 213 are sequentially arranged on the cold re-steam inlet pipeline 21 and controlled by a cold re-control unit 210, the electric valve 211 and the manual valve 213 ensure that cold re-steam is completely isolated after the steam source is switched, and the adjusting valve 212 is used for adjusting the flow rate of the input cold re-steam;
the first-stage auxiliary steam inlet pipeline 22 is provided with two electric valves 221 and 222, a flow meter 24 and two dewatering wells 251 and 252, the two electric valves 222 and 222 are controlled by a first-stage auxiliary steam control unit 220, so that first-stage auxiliary steam can be isolated in time under special conditions, the flow meter 24 outputs detected steam flow to the main controller 1, the dewatering wells 251 and 252 are controlled to be opened and closed by a dewatering control unit 250, and the at least two dewatering wells 251 and 252 are connected through stainless steel pipes with the outer diameter of 57mm and the wall thickness of 3.5 mm.
An electric contact pressure gauge with the model of YXC-150 is arranged in the second-stage auxiliary steam header 2 and is used for ensuring that the steam pressure in the second-stage auxiliary steam header is maintained within a certain range.
Thermocouples (not shown) with the temperature measuring range of 100-500 degrees are arranged in the first low-pressure cylinder shaft seal chamber, are distributed along the circumferential direction of the annular shaft seal chamber, and are controlled by the temperature detection unit 230.
The outer surface of the second stage unit is provided with a buzzer and an LED lamp (not shown), and the buzzer and the LED lamp are controlled by the LED lamp unit 270.
The auxiliary steam header output pipeline is provided with a thermal deaerator 28 which is controlled by an auxiliary steam deaerator unit 280 and is used for preventing oxygen and steam from combining to corrode the steam turbine set equipment.
In the normal operation of the steam turbine generator set, the secondary auxiliary steam header is usually supplied by a set cold re-steam source through a cold re-steam inlet pipeline and maintains the pressure of 1.0MPa, and the set can supply the secondary auxiliary steam header from the primary set and maintain the pressure of 0.86MPa when the steam source is switched. By means of the steam source switching system of the steam turbine, when any one of the two units is in operation, the auxiliary steam is supplied by the adjacent unit when the unit is in failure, and the safety of the unit in operation and the unit in operation is not affected.
When the steam turbine generator set carries out shaft seal steam source switching, the smooth switching of the shaft seal steam source is realized:
the machine set No. 7 of the last machine set in the second period of 1 month and 22 days of 2017 controls the lowest auxiliary steam temperature to 240 ℃ by adopting the system, and meets the requirements of the lowest auxiliary steam source switching parameters of 0.6MPa and 214.5 ℃ (164.5 ℃ and 50 ℃), as shown in figure 5.
In 2018, 2, 13 and the last unit in the second period, No. 7, adopts the system to control the lowest auxiliary steam temperature to be 237 ℃, and meets the requirements of the minimum auxiliary steam source switching parameters of 0.6MPa and 214.5 ℃ (164.5 ℃ and 50 ℃), as shown in figure 6.
Compared with the prior art, the utility model discloses a set up steam turbine bearing seal steam source switched systems on waiting to close the unit, gradually switch the steam turbine steam source into the assistance vapour of first phase unit by cold steam again through steam turbine bearing seal steam source switched systems, make the gentle switching of steam turbine bearing seal steam source, realize the gentle outage of unit, still can avoid assisting vapour pressure temperature sharp change to arouse other user axial displacement vibration big damage equipment such as xiao machine simultaneously. The utility model has the characteristics of simple structure, it is easy and simple to handle.
The present invention is not limited to the above embodiment, and if various modifications or variations of the present invention do not depart from the spirit and scope of the present invention, they are intended to be covered if they fall within the scope of the claims and the equivalent technology of the present invention.
Claims (10)
1. A steam source switching system of a steam turbine shaft seal is characterized in that: the system comprises a main control unit, a cold re-control unit, a first-stage auxiliary steam control unit, a temperature detection unit and a flow detection unit, wherein the main control unit is electrically connected with the cold re-control unit, the first-stage auxiliary steam control unit, the temperature detection unit and the flow detection unit respectively and controls the operation of the units; the cold re-control unit controls cold re-steam to enter the auxiliary steam header; the first-stage auxiliary steam control unit controls the first-stage auxiliary steam to enter a second-stage auxiliary steam header; the temperature detection unit collects the temperature of the steam turbine shaft seal and feeds the temperature back to the main control unit; the flow detection unit detects the steam flow sent to the second-stage auxiliary steam header by the first-stage auxiliary steam inlet pipeline and feeds the steam flow back to the main control unit.
2. The steam turbine shaft seal steam source switching system of claim 1, wherein: the temperature detection unit adopts a temperature sensor with the temperature measurement range of 100-500 degrees.
3. The steam turbine shaft seal steam source switching system of claim 1, wherein: still including gathering the pressure detection unit of the inside vapour pressure of second phase auxiliary steam header, pressure detection unit with main control unit connects.
4. The steam turbine shaft seal steam source switching system of claim 1, wherein: the drainage control unit is used for controlling the opening and closing of at least two drainage wells and is connected with the main control unit.
5. The steam turbine shaft seal steam source switching system of claim 1, wherein: the steam turbine shaft seal temperature prompting device further comprises an LED lamp unit for prompting the temperature of the steam turbine shaft seal, and the LED lamp unit is connected with the main control unit.
6. The steam turbine shaft seal steam source switching system of claim 1, wherein: the flow detection unit detects the steam flow sent to the second-stage auxiliary steam header by the first-stage auxiliary steam inlet pipeline by adopting a flowmeter.
7. The steam turbine shaft seal steam source switching system of claim 1, wherein: the cold re-control unit adopts an electric valve, an adjusting valve and a manual valve to control cold re-steam to enter the second-stage auxiliary steam header, and the first-stage auxiliary steam control unit adopts two electric valves to control first-stage auxiliary steam to enter the second-stage auxiliary steam header.
8. The steam turbine shaft seal steam source switching system of claim 1, wherein: still including the supplementary vapour deoxidization unit of control auxiliary vapour confession oxygen-eliminating device switching, supplementary vapour deoxidization unit with main control unit connects.
9. A steam turbine generator set comprising: the steam turbine shaft seal steam source switching system of claim 1, and the first stage unit, the second stage unit, each include: the steam provided by the auxiliary steam header is heated by the electric heater and then supplied to the high-pressure cylinder, the intermediate-pressure cylinder, the first low-pressure cylinder and the second low-pressure cylinder for power generation;
the shaft seal steam source switching system comprises a main control unit, a cold re-control unit, a first-stage auxiliary steam control unit, a temperature detection unit and a flow detection unit, wherein the main control unit, the cold re-control unit, the first-stage auxiliary steam control unit and the flow detection unit are arranged on a second-stage unit auxiliary steam header, and the temperature detection unit is arranged in a first low-pressure cylinder chamber of the unit.
10. The steam turbine generator set of claim 9, wherein: a first-stage auxiliary steam inlet pipeline and a cold re-steam inlet pipeline are respectively arranged on an auxiliary steam header on the second-stage unit, the first-stage auxiliary steam inlet pipeline is connected with a first-stage auxiliary steam source, and two electric valves are arranged on the first-stage auxiliary steam inlet pipeline and are controlled by a first-stage auxiliary steam control unit; the cold re-steam inlet pipeline is connected with a cold re-steam source, an electric valve, an adjusting valve and a manual valve are sequentially arranged on the cold re-steam inlet pipeline, and the electric valve, the adjusting valve and the manual valve are controlled by a cold re-control unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920338908.1U CN209908575U (en) | 2019-03-15 | 2019-03-15 | Steam turbine shaft seal steam source switching system and steam turbine generator set |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920338908.1U CN209908575U (en) | 2019-03-15 | 2019-03-15 | Steam turbine shaft seal steam source switching system and steam turbine generator set |
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| CN209908575U true CN209908575U (en) | 2020-01-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819400A (en) * | 2021-07-30 | 2021-12-21 | 西安西热节能技术有限公司 | Multi-source integrated automatic switching combined steam supply system and method |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819400A (en) * | 2021-07-30 | 2021-12-21 | 西安西热节能技术有限公司 | Multi-source integrated automatic switching combined steam supply system and method |
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Granted publication date: 20200107 |