CN210021666U - High-pressure dry air maintenance system of water vapor system of power station - Google Patents
High-pressure dry air maintenance system of water vapor system of power station Download PDFInfo
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- CN210021666U CN210021666U CN201920485270.4U CN201920485270U CN210021666U CN 210021666 U CN210021666 U CN 210021666U CN 201920485270 U CN201920485270 U CN 201920485270U CN 210021666 U CN210021666 U CN 210021666U
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- 238000012423 maintenance Methods 0.000 title claims abstract description 119
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 238000012544 monitoring process Methods 0.000 claims abstract description 20
- 239000000428 dust Substances 0.000 claims abstract description 9
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 238000004887 air purification Methods 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims description 22
- 229910001220 stainless steel Inorganic materials 0.000 claims description 17
- 239000010935 stainless steel Substances 0.000 claims description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 14
- 230000008014 freezing Effects 0.000 claims description 11
- 238000007710 freezing Methods 0.000 claims description 11
- 238000002955 isolation Methods 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 16
- 239000007789 gas Substances 0.000 description 11
- 239000003921 oil Substances 0.000 description 9
- 238000007664 blowing Methods 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 2
- 238000007605 air drying Methods 0.000 description 1
- KWYKSRAECRPMIS-UHFFFAOYSA-N azane;hydrazine Chemical compound N.NN KWYKSRAECRPMIS-UHFFFAOYSA-N 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
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Abstract
The utility model relates to a high-pressure dry air maintenance system of a water vapor system of a power station, which comprises a high-pressure air preparation system, a high-pressure air purification system and a high-pressure dry air maintenance monitoring system; after the high-pressure dry air subjected to water removal, oil removal and dust removal enters the water vapor system, the high-pressure dry air is discharged out of the water vapor system through an air discharge valve or a drain valve of the water vapor system, residual water in the water vapor system is removed, and the relative humidity of air in the water vapor system is reduced, so that the high-pressure dry air maintenance of the water vapor system is realized; compared with the prior low-pressure dry air maintenance technology, the utility model does not need to remove a large number of check valves in the water vapor system, thereby reducing the workload of removing and recovering the check valves; the pipe diameter of the air inlet pipeline is small, so that the installation workload of the air inlet pipeline is reduced; the problems of water sealing and air plugging are solved, and the dry air maintenance effect is improved; the utility model discloses use the utility model discloses the system can realize the high-pressure dry wind maintenance of power station steam system, effectively reduces the corruption that stops of power station steam system, provides the guarantee for power station safety, economic operation.
Description
Technical Field
The utility model relates to a power station steam system dry air maintenance technical field especially relates to a power station steam system high pressure dry air maintenance system.
Background
At present, the generator set in China enters a development stage with high capacity and high parameters. With the large production of large-capacity units, the generated energy in China is remarkably excessive, the shutdown and standby phenomena of the units are more common, the shutdown time is longer, and strict requirements are provided for shutdown and standby corrosion protection of a water vapor system of a power station. The method for maintaining the water vapor system of domestic and foreign power stations mainly comprises a hot air blowing dry method, a desiccant dehumidification method, a vapor phase corrosion inhibitor method, a dry air drying method, an ammonia-hydrazine method, a nitrogen filling method and the like. Wherein, the dry air maintenance method has good protection effect, long protection period and good economic feasibility, and is widely accepted at home and abroad.
At present, a water vapor system of a power station usually adopts a rotary dehumidifier to remove water in air and generate normal-temperature dry air for dry air maintenance, and the method has the following problems: 1) the outlet air pressure of the rotary dehumidifier is 150 Pa-500 Pa, and because the pressure is low, a large number of check valves in a water vapor system need to be removed when dry air maintenance is carried out, and the workload of removal and recovery is large; 2) the low-pressure air pipe has larger pipe diameter and large installation workload; 3) because power station steam system structure is complicated, current blowing-out technique of draining is difficult to thoroughly put the clean steam system and deposit water, when carrying out the dry air maintenance, because the dry air pressure is lower, has water seal, air lock phenomenon, leads to the maintenance effect to worsen.
Disclosure of Invention
In order to solve the problems existing in the prior art, the utility model aims to provide a high-pressure dry air maintenance system of a steam system of a power station, when the dry air maintenance of the steam system of the power station is carried out, a large number of check valves in the steam system are not required to be removed, and the problems of removal and recovery of the check valves and large workload of air pipe installation are solved; meanwhile, the problems of water seal and air plug existing in the low-pressure dry air maintenance process are prevented, and the standby corrosion of a water vapor system is effectively reduced.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a high-pressure dry air maintenance system of a water vapor system of a power station comprises a high-pressure air preparation system, a high-pressure air purification system connected with the high-pressure air preparation system, and a high-pressure dry air maintenance monitoring system arranged on an air inlet pipeline;
the high-pressure air preparation system comprises an oil-free screw air compressor 1; the high-pressure air purification system comprises a stainless steel air storage tank 3, a freezing type dryer 8 and a filter 10 which are connected in sequence; the high-pressure dry air maintenance monitoring system comprises a flow meter 16, a humidity tester 15, a thermometer 14 and a pressure gauge 13, wherein the flow meter 16 is arranged on an air inlet pipeline 17 behind the filter 10 and used for respectively monitoring the flow, the relative humidity, the temperature and the pressure of high-pressure air during high-pressure dry air maintenance; an air inlet valve 12 is also arranged on the air inlet pipeline 17 positioned behind the filter 10; the high-pressure dry air enters the filter 10 for water removal, dust removal and oil removal, the high-pressure dry air after water removal, oil removal and dust removal enters the power station water vapor system 24 participating in maintenance through the air inlet pipeline 17 and the nitrogen charging valve or the drainage valve 18 of the power station water vapor system 24 participating in maintenance, and the high-pressure dry air is exhausted out of the power station water vapor system 24 participating in maintenance through the air exhaust valve or the drainage valve 21 in the power station water vapor system 24 participating in maintenance to maintain the power station water vapor system 24 participating in maintenance.
The oil-free screw air compressor 1 is connected with a stainless steel air storage tank 3 through a first connecting pipeline 2, the stainless steel air storage tank 3 is provided with a blowdown valve 6 for draining and blowdown periodically, and a safety valve 5 and a pressure gauge 4 are arranged; the freezing type dryer 8 is connected with an outlet of the stainless steel air storage tank 3 through a second connecting pipeline 7 and is used for removing water by high-pressure air; the outlet of the freeze dryer 8 is connected to a filter 10 via a third connecting line 9.
The design parameters of the oil-free screw air compressor 1 and the air inlet pipeline 17 meet the requirement that the pressure of outlet high-pressure air is 0.6-1.0 MPa, and the flow rate meets the air replacement rate of a power station water vapor system participating in maintenance for 1-5 times per hour 24; the working pressure of the freezing dryer 8 is 0.5-1.5 MPa, the air inlet temperature is 0-45 ℃, and the relative humidity of outlet air is less than 10%; the oil content of the air at the outlet of the filter 10 is less than 2ppb, and the impurity content is less than 1 ppb.
The power station water vapor system 24 participating in maintenance is communicated with the air inlet pipeline 17 through a nitrogen charging valve or a dredging and water discharging valve 18, and a valve 28, a check valve 29, an air discharging valve 26, a dredging and water discharging valve 27, a first air discharging valve or a dredging and water discharging valve 20 and a second air discharging valve or a dredging and water discharging valve 21 are sequentially arranged on the pipeline of the power station water vapor system 24 participating in maintenance from an inlet to an outlet; the pipelines of the power station steam system 24 which participates in maintenance and the pipelines of the adjacent first power station steam system 23 which does not participate in maintenance and the second power station steam system 25 which does not participate in maintenance are respectively provided with a first isolation valve 19 and a second isolation valve 22.
The maintenance method of the high-pressure dry air maintenance system of the power station water vapor system is characterized in that the dry air maintenance is carried out by introducing high-pressure dry air into the power station water vapor system 24 participating in maintenance and reducing the relative humidity of air in the water vapor system, and comprises the following steps:
step 1: when the power station stops running, an exhaust valve 26 and a drain valve 27 of a power station water vapor system 24 which participates in maintenance are opened, and exhaust and drainage are carried out through the exhaust valve 26 and the drain valve 27;
step 2: establishing a high-pressure dry air maintenance loop: opening a valve 28 in the power station water vapor system 24 participating in maintenance to conduct the power station water vapor system 24 participating in maintenance; closing the first isolation valve 19 and the second isolation valve 22, isolating the first plant steam system 23 not participating in maintenance and the second plant steam system 25 not participating in maintenance from the plant steam system 24 participating in maintenance, and establishing a dry air maintenance loop: atmosphere → oilless screw compressor 1 → stainless steel gas tank 3 → freeze dryer 8 → filter 10 → air intake duct 17 → station water vapor system 24 taking part in maintenance → high pressure dry air outlet → atmosphere;
and step 3: introducing high-pressure dry air, starting the oil-free screw air compressor 1, adjusting the opening of the air inlet valve 12, and maintaining the reading of the pressure gauge 13 at 0.6-1.0 MPa, wherein the flow rate is 1-5 times of replacing air in the power station water vapor system 24 participating in maintenance per hour;
and 4, step 4: checking the flowing condition of the high-pressure dry air, sequentially detecting the air flowing conditions of an exhaust valve 26 and a drain and drain valve 27 in a power station water vapor system 24 participating in maintenance according to a high-pressure dry air maintenance loop, and closing the exhaust valve 26 and the drain and drain valve 27 after the air flows; if water flows out of the dredging and water discharging valve 27, high-pressure dry air blowing is continuously carried out, and the valve is closed after blowing is carried out for 15-30 min after no water exists;
and 5: and (3) maintaining the high-pressure dry air, wherein the power station water vapor system 24 involved in maintenance continuously introduces the high-pressure dry air, the relative humidity of the exhaust gas is regularly detected at the monitoring position and the high-pressure dry air outlet position, and the air inlet valve 12 is closed when the relative humidity of the exhaust gas is less than 50%.
The high-pressure dry air inlet position is a nitrogen charging valve or a water discharging valve 18 in a power station water vapor system 24 which participates in maintenance; the monitoring position and the high-pressure dry air exhaust position are respectively a first exhaust valve or a drain and drain valve 20 and a second exhaust valve or a drain and drain valve 21 in a power station water vapor system 24 participating in maintenance; the monitoring location is used to monitor the relative humidity within the plant steam system 24 that is involved in service during high pressure dry air service.
And adjusting the high-pressure dry air inlet amount according to the monitoring position and the relative humidity of the high-pressure dry air exhaust position.
The maintenance is carried out by using high-pressure dry air, and the pressure of the dry air is ensured to be enough to prop open a check valve 29 in a water vapor system 24 of the power station participating in the maintenance.
Compared with the prior art, the utility model has the advantages of as follows:
1) the high-pressure dry air is adopted for maintaining the water vapor system of the power station, a large number of check valves in the water vapor system do not need to be dismantled, and the dry air maintenance workload of the water vapor system is reduced;
2) high-pressure dry air enters the water vapor system through a nitrogen charging valve or a water draining valve of the water vapor system of the power station, and the workload of installing an air pipe is small;
3) the problems of water seal and air plug caused by water stored in a water vapor system of the power station are effectively solved, and the guarantee is provided for improving the dry air maintenance effect.
Drawings
Fig. 1 is a schematic view of the system of the present invention.
Detailed Description
Example 1:
the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in FIG. 1, the utility model relates to a power station steam system high pressure dry air maintenance system and method, through letting in high pressure dry air in to the steam system, the mode that reduces the interior air relative humidity of steam system carries out the dry air maintenance. The oil-free screw air compressor 1 is connected with a stainless steel air storage tank 3 through a first connecting pipeline 2, and the freezing type dryer 8 is connected with an outlet of the stainless steel air storage tank 3 through a second connecting pipeline 7 and used for removing water from high-pressure air; the outlet of the freezing dryer 8 is connected with a filter 10 through a third connecting pipeline 9, and high-pressure dry air enters the filter 10 to remove water, dust and oil; the high-pressure dry air after water removal, oil removal and dust removal enters a power station water vapor system 24 participating in maintenance through an air inlet pipeline 17, and is discharged out of the power station water vapor system 24 participating in maintenance through an air discharge valve or a drain valve 21 in the power station water vapor system 24 participating in maintenance to carry out open type high-pressure dry air maintenance; the stainless steel gas storage tank 3 is provided with a blowdown valve 6 for draining water and blowdown periodically, and is also provided with a safety valve 5 and a pressure gauge 4; the air inlet pipe 17 is provided with a flow meter 16, a humidity measuring instrument 15, a thermometer 13 and a pressure gauge 14.
The maintenance method of the embodiment comprises the following implementation steps:
step 1: when the power station stops running, an exhaust valve 26 and a drain valve 27 of a power station water vapor system 24 which participates in maintenance are opened, and exhaust and drainage are carried out through the exhaust valve 26 and the drain valve 27;
step 2: establishing a high-pressure dry air maintenance loop, opening a valve 28 in the power station water vapor system 24 participating in maintenance, and conducting the power station water vapor system 24 participating in maintenance; closing the first isolation valve 19 and the second isolation valve 22, isolating the first plant steam system 23 not participating in maintenance and the second plant steam system 25 not participating in maintenance from the plant steam system 24 participating in maintenance, and establishing a dry air maintenance loop: atmosphere → oilless screw compressor 1 → stainless steel gas tank 3 → freeze dryer 8 → filter 10 → air intake duct 17 → station water vapor system 24 taking part in maintenance → high pressure dry air outlet → atmosphere;
and step 3: introducing high-pressure dry air, starting the oil-free screw air compressor 1, adjusting the opening degree of the air inlet valve 12, maintaining the reading of the pressure gauge 13 at 0.9MPa, and replacing air in the power station water vapor system 24 participating in maintenance for 2 times per hour at the flow rate; the air inlet temperature of the high-pressure dry air is 10 ℃, and the relative humidity is 0.5%; the oil content of the dry air at the outlet of the filter is less than 2ppb, and the impurity content is less than 1 ppb;
and 4, step 4: checking the flowing condition of the high-pressure dry air, sequentially detecting the air flowing conditions of an exhaust valve 26 and a drain and drain valve 27 in a power station water vapor system 24 participating in maintenance according to a high-pressure dry air maintenance loop, and closing the exhaust valve 26 and the drain and drain valve 27 after the air flows; if water flows out of the dredging and water discharging valve 27, high-pressure dry air blowing is continuously carried out, and the valve is closed after blowing is carried out for 15-30 min after no water exists;
and 5: and (3) maintaining the high-pressure dry air, wherein the high-pressure dry air is continuously introduced into the power station water vapor system 24 involved in maintenance, the relative humidity of the exhaust gas is regularly detected at the monitoring position and the high-pressure dry air outlet position, the relative humidity of the exhaust gas is less than 50%, and the air inlet valve 12 can be properly closed.
Table 1 shows the monitoring records of the high-pressure dry air maintenance monitoring position and the exhaust position in this embodiment.
TABLE 1 EXAMPLE 1 high pressure Dry air maintenance monitoring location and exhaust location monitoring record (total 26 weeks)
Example 2:
as shown in FIG. 1, the utility model relates to a power station steam system high pressure dry air maintenance system and method, through letting in high pressure dry air in to the steam system, the mode that reduces the interior air relative humidity of steam system carries out the dry air maintenance. The oil-free screw air compressor 1 is connected with a stainless steel air storage tank 3 through a first connecting pipeline 2, and the freezing type dryer 8 is connected with an outlet of the stainless steel air storage tank 3 through a second connecting pipeline 7 and used for removing water from high-pressure air; the outlet of the freezing dryer 8 is connected with a filter 10 through a third connecting pipeline 9, and high-pressure dry air enters the filter 10 to remove water, dust and oil; the high-pressure dry air after water removal, oil removal and dust removal enters a power station water vapor system 24 participating in maintenance through an air inlet pipeline 17, and is discharged out of the power station water vapor system 24 participating in maintenance through an air discharge valve or a drain valve 21 of the power station water vapor system 24 participating in maintenance to carry out open type high-pressure dry air maintenance; the stainless steel gas storage tank 3 is provided with a blowdown valve 6 for draining water and blowdown periodically, and is also provided with a safety valve 5 and a pressure gauge 4; the air inlet pipe 17 is provided with a flow meter 16, a humidity measuring instrument 15, a thermometer 13 and a pressure gauge 14.
The maintenance method of the embodiment comprises the following implementation steps:
step 1: when the power station stops running, an exhaust valve 26 and a drain valve 27 of a power station water vapor system 24 which participates in maintenance are opened, and exhaust and drainage are carried out through the exhaust valve 26 and the drain valve 27;
step 2: establishing a high-pressure dry air maintenance loop, opening a valve 28 in the power station water vapor system 24 involved in maintenance, and conducting the power station water vapor system 24 involved in maintenance; closing the first isolation valve 19 and the second isolation valve 22 isolates the first non-maintenance power station steam system 23 and the second non-maintenance power station steam system 25 from the maintenance power station steam system 24, and a dry air maintenance loop is established: atmosphere → oilless screw compressor 1 → stainless steel gas tank 3 → freeze dryer 8 → filter 10 → air intake duct 17 → station water vapor system 24 taking part in maintenance → high pressure dry air outlet → atmosphere;
and step 3: introducing high-pressure dry air, starting the oil-free screw air compressor 1, adjusting the opening of the air inlet valve 12, maintaining the reading of the pressure gauge 13 at 0.6MPa, and setting the flow of air in the power station steam exchange system 24 participating in maintenance every hour for 1 time; the air inlet temperature of the high-pressure dry air is 10 ℃, and the relative humidity is 1.5%; the oil content of the dry air at the outlet of the filter is less than 2ppb, and the impurity content is less than 1 ppb;
and 4, step 4: and (4) checking the flowing condition of the high-pressure dry air, sequentially detecting the air flowing conditions of an exhaust valve 26 and a drain and drain valve 27 in the power station water vapor system 24 participating in maintenance according to a high-pressure dry air maintenance loop, and closing the exhaust valve 26 and the drain and drain valve 27 after the air flows. If the water draining and discharging valve 27 has water to flow out, high-pressure dry air blowing is continuously carried out, and the valve is closed after blowing is carried out for 15-30 min after no water exists.
And 5: and (3) maintaining the high-pressure dry air, wherein the high-pressure dry air is continuously introduced into the power station water vapor system 24 involved in maintenance, the relative humidity of the exhaust gas is regularly detected at the monitoring position and the high-pressure dry air outlet position, the relative humidity of the exhaust gas is less than 50%, and the air inlet valve 12 can be properly closed.
As shown in table 2, the monitoring records of the high pressure dry air maintenance monitoring position and the exhaust position in this embodiment are shown.
Table 2 example 2 high pressure dry air maintenance monitoring location and exhaust location monitoring records (for 26 weeks).
Claims (4)
1. The utility model provides a power station steam system high pressure dry air maintenance system which characterized in that: the system comprises a high-pressure air preparation system, a high-pressure air purification system connected with the high-pressure air preparation system, and a high-pressure dry air maintenance monitoring system arranged on an air inlet pipeline;
the high-pressure air preparation system comprises an oil-free screw air compressor (1); the high-pressure air purification system comprises a stainless steel air storage tank (3), a freezing type dryer (8) and a filter (10) which are connected in sequence; the high-pressure dry air maintenance monitoring system comprises a flow meter (16), a humidity tester (15), a thermometer (14) and a pressure gauge (13), wherein the flow meter, the relative humidity, the temperature and the pressure of high-pressure air are respectively monitored during high-pressure dry air maintenance, the flow meter is arranged on an air inlet pipeline (17) behind a filter (10); an air inlet valve (12) is also arranged on the air inlet pipeline (17) positioned behind the filter (10); the high-pressure dry air enters the filter (10) to be subjected to water removal, dust removal and oil removal, the high-pressure dry air subjected to water removal, oil removal and dust removal enters the power station water vapor system (24) involved in maintenance through the air inlet pipeline (17) and the nitrogen charging valve or the third dredging and water discharging valve (18) of the power station water vapor system (24) involved in maintenance, and the high-pressure dry air is subjected to maintenance on the power station water vapor system (24) involved in maintenance by discharging the power station water vapor system (24) involved in maintenance through the second air discharging valve or the second dredging and water discharging valve (21) in the power station water vapor system (24) involved in maintenance.
2. The power station steam system high pressure dry air maintenance system of claim 1, characterized in that: the oil-free screw air compressor (1) is connected with a stainless steel air storage tank (3) through a first connecting pipeline (2), the stainless steel air storage tank (3) is provided with a blowdown valve (6) for draining and blowdown periodically, and a safety valve (5) and a pressure gauge (4) are arranged; the freezing dryer (8) is connected with an outlet of the stainless steel air storage tank (3) through a second connecting pipeline (7) and is used for removing water by high-pressure air; the outlet of the freezing dryer (8) is connected with the filter (10) through a third connecting pipeline (9).
3. The power station steam system high pressure dry air maintenance system of claim 1, characterized in that: the design parameters of the oil-free screw air compressor (1) and the air inlet pipeline (17) meet the requirement that the pressure of outlet high-pressure air is 0.6-1.0 MPa, and the flow rate meets the air replacement rate of a power station water vapor system (24) participating in maintenance for 1-5 times per hour; the working pressure of the freezing dryer (8) is 0.5-1.5 MPa, the air inlet temperature is 0-45 ℃, and the relative humidity of the outlet air is less than 10%; the oil content of the air at the outlet of the filter (10) is less than 2ppb, and the impurity content is less than 1 ppb.
4. The power station steam system high pressure dry air maintenance system of claim 1, characterized in that: the power station water vapor system (24) participating in maintenance is communicated with the air inlet pipeline (17) through a nitrogen charging valve or a third dredging and water discharging valve (18), and a valve (28), a check valve (29), an air discharging valve (26), a fourth dredging and water discharging valve (27), a first air discharging valve or a first dredging and water discharging valve (20) and a second air discharging valve or a second dredging and water discharging valve (21) are sequentially arranged on the pipeline of the power station water vapor system (24) participating in maintenance from an inlet to an outlet; and a first isolation valve (19) and a second isolation valve (22) are respectively arranged on pipelines connected with the power station steam system (24) participating in maintenance and the adjacent first power station steam system (23) not participating in maintenance and the second power station steam system (25) not participating in maintenance.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109908714A (en) * | 2019-04-11 | 2019-06-21 | 西安热工研究院有限公司 | High-pressure dry air maintenance system and method for water vapor system of power station |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109908714A (en) * | 2019-04-11 | 2019-06-21 | 西安热工研究院有限公司 | High-pressure dry air maintenance system and method for water vapor system of power station |
| CN109908714B (en) * | 2019-04-11 | 2024-01-23 | 西安热工研究院有限公司 | High-pressure dry air maintenance system and maintenance method for water vapor system of power station |
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