CN109908714B - High-pressure dry air maintenance system and maintenance method for water vapor system of power station - Google Patents
High-pressure dry air maintenance system and maintenance method for water vapor system of power station Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 144
- 238000012423 maintenance Methods 0.000 title claims abstract description 133
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012544 monitoring process Methods 0.000 claims abstract description 24
- 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
- 229910001220 stainless steel Inorganic materials 0.000 claims description 18
- 239000010935 stainless steel Substances 0.000 claims description 18
- 238000003860 storage Methods 0.000 claims description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 238000002955 isolation Methods 0.000 claims description 12
- 239000003921 oil Substances 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 238000010926 purge Methods 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 2
- 230000000737 periodic effect Effects 0.000 claims description 2
- 230000008014 freezing Effects 0.000 claims 1
- 238000007710 freezing Methods 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000010865 sewage Substances 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
- 239000002274 desiccant Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention relates to a high-pressure dry air maintenance system and a maintenance method for a water vapor system of a power station, wherein the system 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 water vapor system is exhausted through an exhaust air valve or a drain valve of the water vapor system to remove residual moisture in the water vapor system, 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 existing low-pressure dry air maintenance technology, the invention does not need to dismantle a large number of check valves in the water vapor system, thereby reducing the workload of dismantling and recovering the check valves; the pipe diameter of the air inlet pipeline is smaller, so that the installation workload of the air inlet pipeline is reduced; the problems of water seal and air lock are solved, and the maintenance effect of dry air is improved; the system and the method can realize high-pressure dry air maintenance of the water vapor system of the power station, effectively reduce standby corrosion of the water vapor system of the power station, and provide guarantee for safe and economic operation of the power station.
Description
Technical Field
The invention relates to the technical field of dry air maintenance of a power station water vapor system, in particular to a high-pressure dry air maintenance system and a maintenance method of the power station water vapor system.
Background
At present, the generator set in China enters a development stage with large capacity and high parameters. Along with the mass production of the high-capacity unit, the shutdown time is longer, and strict requirements are put on the shutdown corrosion protection of the water vapor system of the power station. The shutdown maintenance method of the water vapor system of the power station at home and abroad mainly comprises a hot air blowing dry method, a drying agent dewet method, a vapor phase corrosion inhibitor method, a dry air drying method, an ammonia-hydrazine method, a nitrogen charging method and the like. The dry air maintenance method has good protection effect, long protection period and good economical feasibility, and is widely accepted at home and abroad.
At present, a rotary dehumidifier is generally adopted in a water vapor system of a power station to remove water in air, and dry air at normal temperature is generated for dry air maintenance, and the method has the following problems: 1) The air pressure at the outlet of the rotary dehumidifier is 150 Pa-500 Pa, and because the pressure is low, a large number of check doors in the water vapor system need to be removed when the maintenance of the dry air is carried out, and the removing and recovering workload is high; 2) The low-pressure air pipe has larger pipe diameter and large installation workload; 3) Because the power station steam system structure is complicated, current blowing out drainage technology is difficult to thoroughly put clean steam system internal water, when carrying out the dry air maintenance, because dry air pressure is lower, has water seal, air lock phenomenon, leads to the maintenance effect to become poor.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a high-pressure dry air maintenance system and a maintenance method for a water vapor system of a power station, which are free from removing a large number of check doors in the water vapor system when the dry air maintenance of the water vapor system of the power station is carried out, so that the problems of large work load of the check door removal, recovery and air duct installation are solved; meanwhile, the problems of water seal and air lock in the low-pressure dry air maintenance process are prevented, and the standby corrosion of the water vapor system is effectively reduced.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the high-pressure dry air maintenance system of the water vapor system of the 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 freeze dryer 8 and a filter 10 which are connected in sequence; the high-pressure dry air maintenance monitoring system comprises a flowmeter 16, a hygrometer 15, a thermometer 14 and a pressure gauge 13, wherein the flowmeter 16, the hygrometer, the temperature and the pressure of high-pressure air are respectively monitored during the maintenance of the high-pressure dry air arranged on an air inlet pipeline 17 behind the filter 10; an air inlet valve 12 is also arranged on an air inlet pipeline 17 behind the filter 10; the high-pressure dry air enters the filter 10 to remove water, dust and oil, the high-pressure dry air after the water, oil and dust removal enters the power station water vapor system 24 to be maintained through the air inlet pipeline 17 and the nitrogen charging valve or the drain valve 18 of the power station water vapor system 24 to be maintained, and the high-pressure dry air maintenance is carried out on the power station water vapor system 24 to be maintained by discharging the exhaust valve or the drain valve 21 in the power station water vapor system 24 to be maintained out of the power station water vapor system 24 to be maintained.
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 blow-down valve 6 for periodic water and blow-down, and a safety valve 5 and a pressure gauge 4 are arranged; the freeze dryer 8 is connected with the outlet of the stainless steel air storage tank 3 through a second connecting pipeline 7 and is used for removing water from high-pressure air; the outlet of the freeze dryer 8 is connected with a filter 10 through a third connecting pipe 9.
Design parameters of the oil-free screw air compressor 1 and the air inlet pipeline 17 meet the conditions that the pressure of outlet high-pressure air is 0.6-1.0 MPa, and the flow rate meets the air replacement rate of the power station water vapor system 24 participating in maintenance for 1-5 times per hour; the working pressure of the freeze 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 air at the outlet of the filter 10 has an oil content of less than 2ppb and an impurity content of less than 1ppb.
The station water vapor system 24 participating in maintenance is communicated with an air inlet pipeline 17 through a nitrogen charging valve or a drain valve 18, and a valve 28, a check valve 29, an exhaust valve 26, a drain valve 27, a first exhaust valve or a drain valve 20 and a second exhaust valve or a drain valve 21 are sequentially arranged on the pipeline of the station water vapor system 24 participating in maintenance from an inlet to an outlet; the first isolation valve 19 and the second isolation valve 22 are respectively arranged on pipelines of the maintenance-participating power station water vapor system 24, which are connected with the adjacent first maintenance-not-participating power station water vapor system 23 and the second maintenance-not-participating power station water vapor system 25.
The maintenance method of the high-pressure dry air maintenance system of the power station water vapor system comprises the following steps of:
step 1: when the power station stops operating, an exhaust valve 26 and a drain valve 27 of a water vapor system 24 of the power station which participates in maintenance are opened, and the exhaust valve 26 and the drain valve 27 are used for exhausting and draining water;
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 to isolate the first maintenance-free power station steam system 23 and the second maintenance-free power station steam system 25 from the maintenance-free power station steam system 24, and establishing a dry air maintenance loop: atmospheric, an oilless screw air compressor 1, a stainless steel air storage tank 3, a freeze dryer 8, a filter 10, an air inlet pipeline 17, a power station water vapor system 24 participating in maintenance, a high-pressure dry air outlet and atmospheric;
step 3: introducing high-pressure dry air, starting the oil-free screw air compressor 1, regulating the opening of the air inlet valve 12, maintaining the indication of the pressure gauge 13 to be 0.6-1.0 MPa, and replacing air in the water vapor system 24 of the power station participating in maintenance for 1-5 times per hour;
step 4: checking the high-pressure dry air flowing condition, sequentially detecting the air flowing conditions of the air exhaust valve 26 and the drain valve 27 in the water vapor system 24 of the power station participating in maintenance according to a high-pressure dry air maintenance loop, and closing the air exhaust valve 26 and the drain valve 27 after the air flows; if water flows out of the drain valve 27, high-pressure dry air purging should be continuously carried out, and the purging is closed after 15-30 min after no water exists;
step 5: and (3) maintaining the high-pressure dry air, continuously introducing the high-pressure dry air into the water vapor system 24 of the power station involved in maintenance, detecting the relative humidity of the exhaust gas at the monitoring position and the high-pressure dry air outlet position at regular intervals, and closing the air inlet valve 12 if 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 drain valve 18 in a water vapor system 24 of the power station which participates in maintenance; the monitoring position and the high-pressure dry air exhaust position are respectively a first exhaust valve or drain valve 20 and a second exhaust valve or drain valve 21 in a station water vapor system 24 which participates in maintenance; the monitoring location is used to monitor the relative humidity within the plant water vapor system 24 that is involved in maintenance during high pressure dry wind maintenance.
And adjusting the high-pressure dry air inlet amount according to the relative humidity of the monitoring position and the high-pressure dry air exhaust position.
The maintenance is performed using high pressure dry air, ensuring that the dry air pressure is sufficient to open the check valve 29 in the station water vapor system 24 that is involved in the maintenance.
Compared with the prior art, the invention has the following advantages:
1) The high-pressure dry air is adopted for maintaining the water vapor system of the power station, so that a large number of check doors in the water vapor system are not required to be removed, and the dry air maintenance workload of the water vapor system is reduced;
2) The high-pressure dry air enters the water vapor system through a nitrogen charging valve or a drain valve of the water vapor system of the power station, and the workload of air pipe installation is small;
3) The problem of water seal and air lock caused by water stored in the water vapor system of the power station is effectively solved, and the maintenance effect of dry wind is guaranteed.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
Example 1:
the invention is described in further detail below with reference to the drawings and the detailed description.
As shown in fig. 1, according to the high-pressure dry air maintenance system and method for the water vapor system of the power station, the dry air maintenance is performed in a mode of reducing the relative humidity of air in the water vapor system by introducing high-pressure dry air into the water vapor system. 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 freeze 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 from high-pressure air; the outlet of the freeze 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 subjected to 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 exhaust valve or a drain valve 21 in the power station water vapor system 24 participating in maintenance, so that open high-pressure dry air maintenance is performed; the stainless steel gas storage tank 3 is provided with a drain valve 6 for periodically draining water and sewage, and is provided with a safety valve 5 and a pressure gauge 4; the air intake pipe 17 is provided with a flowmeter 16, a hygrometer 15, a thermometer 13 and a manometer 14.
The maintenance method of the embodiment comprises the following implementation steps:
step 1: when the power station stops operating, an exhaust valve 26 and a drain valve 27 of a water vapor system 24 of the power station which participates in maintenance are opened, and the exhaust valve 26 and the drain valve 27 are used for exhausting and draining water;
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 to isolate the first maintenance-free power station steam system 23 and the second maintenance-free power station steam system 25 from the maintenance-free power station steam system 24, and establishing a dry air maintenance loop: atmospheric, an oilless screw air compressor 1, a stainless steel air storage tank 3, a freeze dryer 8, a filter 10, an air inlet pipeline 17, a power station water vapor system 24 participating in maintenance, a high-pressure dry air outlet and atmospheric;
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 indication of the pressure gauge 13 to be 0.9MPa, and replacing air in the water vapor system 24 of the power station participating in maintenance for 2 times per hour; the 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 1ppb;
step 4: checking the high-pressure dry air flowing condition, sequentially detecting the air flowing conditions of the air exhaust valve 26 and the drain valve 27 in the water vapor system 24 of the power station participating in maintenance according to a high-pressure dry air maintenance loop, and closing the air exhaust valve 26 and the drain valve 27 after the air flows; if water flows out of the drain valve 27, high-pressure dry air purging should be continuously carried out, and the purging is closed after 15-30 min after no water exists;
step 5: the high-pressure dry air is maintained, the high-pressure dry air is continuously introduced into the water vapor system 24 of the power station involved in maintenance, the relative humidity of the exhaust gas is detected at the monitoring position and the high-pressure dry air outlet position at regular intervals, the relative humidity of the exhaust gas is less than 50%, and the air inlet valve 12 can be properly closed.
The high pressure dry air maintenance monitoring positions and the exhaust position monitoring records of this example are shown in table 1.
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, according to the high-pressure dry air maintenance system and method for the water vapor system of the power station, the dry air maintenance is performed in a mode of reducing the relative humidity of air in the water vapor system by introducing high-pressure dry air into the water vapor system. 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 freeze 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 from high-pressure air; the outlet of the freeze 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 subjected to 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 exhaust valve or a drain valve 21 of the power station water vapor system 24 participating in maintenance, so that open high-pressure dry air maintenance is performed; the stainless steel gas storage tank 3 is provided with a drain valve 6 for periodically draining water and sewage, and is provided with a safety valve 5 and a pressure gauge 4; the air intake pipe 17 is provided with a flowmeter 16, a hygrometer 15, a thermometer 13 and a manometer 14.
The maintenance method of the embodiment comprises the following implementation steps:
step 1: when the power station stops operating, an exhaust valve 26 and a drain valve 27 of a water vapor system 24 of the power station which participates in maintenance are opened, and the exhaust valve 26 and the drain valve 27 are used for exhausting and draining water;
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 to isolate the first maintenance-free power station steam system 23 and the second maintenance-free power station steam system 25 from the maintenance-free power station steam system 24, and establishing a dry air maintenance loop: atmospheric, an oilless screw air compressor 1, a stainless steel air storage tank 3, a freeze dryer 8, a filter 10, an air inlet pipeline 17, a power station water vapor system 24 participating in maintenance, a high-pressure dry air outlet and atmospheric;
step 3: introducing high-pressure dry air, starting the oil-free screw air compressor 1, regulating the opening of the air inlet valve 12, maintaining the indication of the pressure gauge 13 to be 0.6MPa, and setting the flow rate of air in the water vapor exchange system 24 of the power station participating in maintenance for 1 time per hour; the 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 1ppb;
step 4: and (3) checking the flow condition of high-pressure dry air, and sequentially detecting the air flow conditions of the air exhaust valve 26 and the drain valve 27 in the water vapor system 24 of the power station participating in maintenance according to a high-pressure dry air maintenance loop, wherein after the air flows, the air exhaust valve 26 and the drain valve 27 are closed. If water flows out of the drain valve 27, high-pressure dry air purging should be continuously performed, and the purging is closed after 15-30 min after no water exists.
Step 5: the high-pressure dry air is maintained, the high-pressure dry air is continuously introduced into the water vapor system 24 of the power station involved in maintenance, the relative humidity of the exhaust gas is detected at the monitoring position and the high-pressure dry air outlet position at regular intervals, the relative humidity of the exhaust gas is less than 50%, and the air inlet valve 12 can be properly closed.
The high pressure dry air maintenance monitoring locations and exhaust location monitoring records of this example are shown in table 2.
Table 2 example 2 high pressure dry air maintenance monitoring location and exhaust location monitoring record (total 26 weeks)
Claims (5)
1. A maintenance method of a high-pressure dry air maintenance system of a power station water vapor system is characterized by comprising the following steps of: the maintenance 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 dryer (8) and a filter (10) which are connected in sequence; the high-pressure dry air maintenance monitoring system comprises a flowmeter (16), a humidity tester (15), a thermometer (14) and a pressure meter (13), wherein the flowmeter (16), the humidity tester (15), the thermometer (14) and the pressure meter (13) are used for respectively monitoring the flow rate, the relative humidity, the temperature and the pressure of high-pressure air during the high-pressure dry air maintenance arranged on an air inlet pipeline (17) behind the filter (10); an air inlet valve (12) is also arranged on an air inlet pipeline (17) positioned behind the filter (10); the high-pressure dry air enters a filter (10) to remove water, dust and oil, the high-pressure dry air subjected to the water removal, the oil removal and the dust removal enters a power station water vapor system (24) which is participated in maintenance through an air inlet pipeline (17) and a nitrogen charging valve or a drain valve (18) of the power station water vapor system (24) which is participated in the maintenance, and the high-pressure dry air maintenance is carried out on the power station water vapor system (24) which is participated in the maintenance by discharging the air discharging valve or the drain valve (21) in the power station water vapor system (24) which is participated in the maintenance;
design parameters of the oil-free screw air compressor (1) and the air inlet pipeline (17) meet the conditions 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 freeze 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 outlet air of the filter (10) is less than 2ppb, and the impurity content is less than 1ppb;
the power station water vapor system (24) participating in maintenance is communicated with an air inlet pipeline (17) through a nitrogen charging valve or a drain valve (18), and a valve (28), a check valve (29), an exhaust valve (26), a drain valve (27), a first exhaust valve or a drain valve (20) and a second exhaust valve or a drain 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; a first isolation valve (19) and a second isolation valve (22) are respectively arranged on pipelines connected with the adjacent first power station water vapor system (23) and the adjacent second power station water vapor system (25);
the maintenance method comprises the following steps: the dry air maintenance is performed by introducing high-pressure dry air into a water vapor system (24) of a power station involved in the maintenance and reducing the relative humidity of air in the water vapor system, and the method comprises the following steps of:
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 the exhaust valve (26) and the drain valve (27) are used for exhausting and draining water;
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 a first isolation valve (19) and a second isolation valve (22), isolating a first power station water vapor system (23) and a second power station water vapor system (25) which do not participate in maintenance from a power station water vapor system (24) which participate in maintenance, and establishing a dry air maintenance loop: atmospheric air-oil-free screw air compressor (1), stainless steel air storage tank (3), freeze dryer (8), filter (10), air inlet pipeline (17), power station water vapor system (24) participating in maintenance, high-pressure dry air outlet and atmospheric air;
step 3: introducing high-pressure dry air, starting an oil-free screw air compressor (1), regulating the opening of an air inlet valve (12), maintaining the indication of a pressure gauge (13) to be 0.6-1.0 MPa, and replacing air in a water vapor system (24) of a power station participating in maintenance for 1-5 times per hour;
step 4: checking the high-pressure dry air flowing condition, sequentially detecting the air flowing condition of an air exhausting valve (26) and a drain valve (27) in a water vapor system (24) of a power station participating in maintenance according to a high-pressure dry air maintenance loop, and closing the air exhausting valve (26) and the drain valve (27) after the air flows; if water flows out of the drain valve (27), high-pressure dry air purging is continuously carried out, and the valve is closed after 15-30 min of purging is carried out after no water exists;
step 5: and (3) maintaining the high-pressure dry air, continuously introducing the high-pressure dry air into a water vapor system (24) of the power station involved in maintenance, detecting the relative humidity of exhaust gas at a monitoring position and a high-pressure dry air outlet position at regular intervals, and closing the air inlet valve (12) if the relative humidity of the exhaust gas is less than 50%.
2. The maintenance method of a high-pressure dry air maintenance system of a power station water vapor system according to claim 1, wherein: the high-pressure dry air inlet position is a nitrogen charging valve or a drain valve (18) in a water vapor system (24) of the power station which participates in maintenance; the monitoring position and the high-pressure dry air exhaust position are respectively a first exhaust valve or a drain valve (20) and a second exhaust valve or a drain valve (21) in a water vapor system (24) of the power station participating in maintenance; the monitoring location is used to monitor relative humidity within a plant water vapor system (24) that is involved in maintenance during high pressure dry wind maintenance.
3. The maintenance method of a high-pressure dry air maintenance system of a power station water vapor system according to claim 1, wherein: and adjusting the high-pressure dry air inlet amount according to the relative humidity of the monitoring position and the high-pressure dry air exhaust position.
4. The maintenance method of a high-pressure dry air maintenance system of a power station water vapor system according to claim 1, wherein: the maintenance is performed by adopting high-pressure dry air, and the pressure of the dry air is ensured to be enough to push open a check valve (29) in a water vapor system (24) of the power station participating in the maintenance.
5. The maintenance method of a high-pressure dry air maintenance system of a power station water vapor system according to claim 1, wherein: 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 blow-down valve (6) for periodic water and blow-down, and a safety valve (5) and a pressure gauge (4) are arranged; the freeze 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 from high-pressure air; the outlet of the freeze dryer (8) is connected with the filter (10) through a third connecting pipeline (9).
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| CN111577407B (en) * | 2020-05-26 | 2022-07-29 | 三门核电有限公司 | Dry maintenance method for nuclear power plant during two-loop shutdown |
| CN115263450B (en) * | 2022-08-01 | 2024-04-23 | 西安热工研究院有限公司 | Maintenance system and maintenance method for stator cooling water system of steam turbine generator unit |
| CN116081738A (en) * | 2023-02-28 | 2023-05-09 | 西安热工研究院有限公司 | Shutdown maintenance system and maintenance method for sea water desalination device |
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