CN115234478B - Nuclear power plant pressure air production system and control method thereof - Google Patents
Nuclear power plant pressure air production system and control method thereof Download PDFInfo
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- CN115234478B CN115234478B CN202210668812.8A CN202210668812A CN115234478B CN 115234478 B CN115234478 B CN 115234478B CN 202210668812 A CN202210668812 A CN 202210668812A CN 115234478 B CN115234478 B CN 115234478B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000008929 regeneration Effects 0.000 claims description 33
- 238000011069 regeneration method Methods 0.000 claims description 33
- 238000001179 sorption measurement Methods 0.000 claims description 15
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 abstract description 9
- 238000007906 compression Methods 0.000 abstract description 9
- 238000012423 maintenance Methods 0.000 abstract description 4
- 239000000446 fuel Substances 0.000 abstract 4
- 238000001035 drying Methods 0.000 description 9
- 230000000875 corresponding effect Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 210000000056 organ Anatomy 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000033667 organ regeneration Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/06—Combinations of two or more pumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/16—Filtration; Moisture separation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/10—Other safety measures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Drying Of Gases (AREA)
Abstract
The invention provides a nuclear power plant air compression production system which comprises a main air compressor, a main air dryer, a first dew-point meter, an emergency air compressor, a first emergency dryer and a second dew-point meter, wherein the main air compressor, the main air dryer and the first dew-point meter are sequentially connected through pipelines; one end of the middle pipeline is connected to the downstream of the first dew point meter outlet pipeline, and the other end of the middle pipeline is connected to the emergency air compressor outlet pipeline. In addition, the invention also provides a control method of the nuclear power plant air pressure production system. The nuclear power plant air-fuel production system and the control method thereof provided by the invention have the advantages that the air-fuel consumption of the nuclear power plant air-fuel production system is reduced, the system stability is improved, the loading duty ratio of the main air compressor is reduced, the air-fuel standby capacity is improved, the station power is saved, and the equipment consumption and the maintenance cost are reduced.
Description
Technical Field
The invention relates to the technical field of nuclear power plant reactor operation, in particular to a pressure air production system of a nuclear power plant and a control method thereof.
Background
The nuclear power plant air pressure production system provides necessary compressed air for the pneumatic valves and pneumatic regulators of a plurality of regulating systems of the power plant, and the quality of the compressed air, such as pressure, dew point, stability and the like, directly influences the safe and stable operation of the unit.
In addition, the important and non-important user pressure air quality requirements are different (the important user dew point requirements are stricter) under the daily operation working condition, the previous operation mode is that each unit is in non-associated operation, and in order to keep the dew point qualified, the main dryer and the emergency dryer are in an excessive regeneration operation state. In this mode of operation, unnecessary consumption of pressure air is caused. Air consumption of Qin two factories 3 and 4 machine sets is as high as 2000m 3 About/h, the excessive air consumption leads to the long-term operation of the main air compressor under higher load, the failure rate is high, the increase of temporary load can also lead to the frequent start of the standby air compressor, the loading and unloading of the main air compressor and the regeneration consumption of the dryer lead to the large pressure fluctuation of the air network, and the air supply quality is poor.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a nuclear power plant air-compressed production system and a control method thereof, which are used for reducing air-compressed loss of the nuclear power plant air-compressed production system, improving system stability, reducing the loading duty ratio of a main air compressor, improving air-compressed spare capacity, saving station service electricity and reducing equipment loss and maintenance cost.
In order to achieve the above object, the present invention provides the following technical solutions:
the nuclear power plant air compression production system comprises a main air compressor, a main air dryer, a first dew-point meter, an emergency air compressor, a first emergency dryer and a second dew-point meter, wherein the main air compressor, the main air dryer and the first dew-point meter are sequentially connected through pipelines; one end of the middle pipeline is connected to the downstream of the first dew point meter outlet pipeline, and the other end of the middle pipeline is connected to the emergency air compressor outlet pipeline.
Further, a second branch circuit with a second emergency dryer and a third dew-point meter is connected in parallel on a first branch circuit where the first emergency dryer and the second dew-point meter are located.
Further, the dew point meter further comprises a fourth dew point meter outlet pipeline connected with the first dew point meter outlet pipeline in parallel, and a fourth dew point meter is arranged on the fourth dew point meter outlet pipeline.
Further, the outlet of the main trunk organ is connected with 2 main trunk organ outlet pipelines in parallel, and a main trunk organ regeneration flow regulating valve is connected between the 2 main trunk organ outlet pipelines.
Further, a gas production check valve is arranged on the outlet pipeline of the main body device.
A control method of a nuclear power plant pressure air production system comprises the following steps:
step S1: the main air compressor is operated, the emergency air compressor is not operated, and the gas produced by the main air compressor is supplied to downstream important users and general users through the main air compressor;
step S2: when the main air compressor is in insufficient supply, the emergency air compressor starts to operate, and after the air produced by the emergency air compressor is dried by two parallel emergency dryers, the air is supplied to downstream important users (conventional island and nuclear island users). When the rear dew point of the emergency dryer is higher or the emergency air compressor is started, the corresponding emergency dryer enters continuous regeneration/adsorption operation; otherwise, the emergency dryer reduces the regeneration frequency and maintains the long-time adsorption mode to reduce unnecessary air consumption.
Compared with the prior art, the nuclear power plant air pressure production system and the control method thereof have the following beneficial effects:
the nuclear power plant air compression production system and the control method thereof provided by the invention have the advantages that the air compression loss is greatly reduced, the stability is improved, the air compression quality is improved, the loading duty ratio of the main air compressor is reduced, the air compression standby capacity is improved, the station power is saved, the equipment loss and the maintenance cost are reduced, and the operation safety and the economy of the air compression system are comprehensively improved.
After the regeneration frequency of four emergency dryers of the 3 and 4 units of the two Qin factories is reduced, the air consumption of the whole factory is reduced by about 25%, the loading time is reduced from 89% to 64% when the main air compressor operates, the problem of frequent starting of the standby air compressor (emergency air compressor) is solved, the amplitude of pressure fluctuation is reduced, and the air quality is improved. The load rate of the main air compressor is reduced, and 51.03 ten thousand degrees of station service electricity can be saved each year through calculation.
In addition, the noise of the emergency dryer reaches more than 90 dB during regeneration, and the noise duration is reduced from 75% to 5.8% during operation of the electric plant due to the reduction of the regeneration frequency, so that noise pollution is greatly reduced, and the working environment is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a pressure air production system of a nuclear power plant according to an embodiment of the present invention;
FIG. 2 is a logic diagram of the operation of the emergency dryer according to the embodiment of the present invention;
FIG. 3 is a graph showing the pressure trend of a pressure-variable pipe network of a nuclear power plant before the implementation of the pressure-variable pipe network of the nuclear power plant according to the embodiment of the invention;
fig. 4 is a pressure change trend chart of a pressure-variable pipe network of a nuclear power plant after the implementation of the pressure-variable pipe network of the nuclear power plant according to the embodiment of the invention.
Reference numerals illustrate:
1. a main air compressor; 2. a main dryer; 3. a main dryer regeneration flow regulating valve; 4. a gas-producing check valve; 5. a first branch; 6. a first dew point meter; 7. a fourth dew point meter; 8. a second branch; 9. a fourth dew point outlet line; 10. a first emergency dryer; 11. a second emergency dryer; 12. a second dew point meter; 13. a third dew point meter; 14. an emergency air compressor; 15. an intermediate pipeline; 16. a first dew point meter outlet line; 17. an outlet pipeline of the emergency air compressor.
Detailed Description
While the nuclear power plant air-to-air production system of the present invention may be implemented in various ways, exemplary embodiments will be described in detail herein with reference to the accompanying drawings, it being understood that the description herein should be considered as illustrative of the structure of the nuclear power plant air-to-air production system and is not intended to limit the scope of the invention to the exemplary embodiments. Accordingly, the drawings and description of the embodiments are to be regarded as illustrative in nature, and not as restrictive. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Further details are provided below with reference to the specific embodiments.
As shown in fig. 1, the invention provides a nuclear power plant air pressure production system, which comprises a main air compressor 1, a main air compressor 2, a first dew-point meter 6, an emergency air compressor 14, a first emergency dryer 10, a second dew-point meter 12 and an intermediate pipeline 15. The main air compressor 1, the main air dryer 2 and the first dew-point meter 6 are connected through pipelines to form one subsystem, the emergency air compressor 14, the first emergency dryer 10 and the second dew-point meter 12 are connected through pipelines to form another subsystem, and the two subsystems are communicated through an intermediate pipeline 15.
The main air compressor 1 is connected with the main dryer 2 through a pipeline, the main dryer 2 is provided with a main dryer outlet pipeline, the main dryer outlet pipeline is connected with a first dew-point meter outlet pipeline 16, a first dew-point meter 6 is arranged on the first dew-point meter outlet pipeline 16, and the first dew-point meter outlet pipeline 16 is respectively connected to emergency air compression of No. 3 and No. 4 units (which is the same as an important user). Only set 3: the downstream of the first dew point meter outlet line 16 is connected to one end of the intermediate line 15, and it should be noted that the downstream is defined by the position of the first dew point meter 6, i.e. the downstream portion of the first dew point meter outlet line 16 where the gas in the line flows through the first dew point meter 6.
The emergency air compressor 14 is connected with the first branch 5 through an emergency air compressor outlet pipeline 17, the first branch 5 is provided with a first emergency dryer 10 and a second dew-point meter 12, and the first branch 5 is led to a nuclear island user of the No. 3 unit and a conventional island user of the No. 3 unit (both are important users). The other end of the intermediate line 15 is connected to an emergency air compressor outlet line 17.
Preferably, a second branch 8 is connected in parallel to the first branch 5, the inlets of the first branch 5 and the second branch 8 are connected with the outlet of an outlet pipeline 17 of the emergency air compressor, and the outlets of the first branch 5 and the second branch 8 are connected to the inlet of the same pipeline and connected to a nuclear island user of the No. 3 unit and a conventional island user of the No. 3 unit (both are important users) through the pipeline. Similarly, a second emergency dryer 11, a third dew point meter 13 are arranged in the second branch 8 in succession along the gas flow direction.
The first emergency dryer 10 and the second emergency dryer 11 are externally connected with an emergency dryer regeneration electromagnetic valve. The emergency dryer regeneration electromagnetic valve is connected with an emergency dryer regeneration exhaust muffler.
The outlet of the main dryer outlet line of the main dryer 2 is also connected with a fourth dew point meter outlet line 9, the fourth dew point meter outlet line 9 being connected in parallel with the first dew point meter outlet line 16. A fourth dew point meter 7 is arranged on the fourth dew point meter outlet pipeline 9. The outlet line of the fourth dew point meter 7 is connected to a public service air network (which is a general user).
Preferably, the main dryer 2 is externally connected with a main dryer regeneration electromagnetic valve. The main dryer regeneration electromagnetic valve is connected with a main dryer regeneration exhaust muffler.
The main dryer outlet pipeline of the main dryer 2 is preferably 2 pipelines connected in parallel, and a main dryer regeneration flow regulating valve 3 is connected between the 2 main dryer outlet pipelines. The outlets of the outlet pipelines of the 2 main trunk devices are converged together.
The outlet pipeline of the main dryer is provided with a gas production check valve 4 to avoid gas production bypass regeneration flow regulating valve.
In addition, the invention also correspondingly provides a control method of the air production system of the nuclear power plant, which mainly comprises the following steps:
step S1: the main air compressor 1 is operated, the emergency air compressor 14 is not operated, and the generated gas of the main air compressor 1 is supplied to important users and general users through the main dryer 2;
step S2: when the main air compressor 1 is in insufficient supply, the emergency air compressor 14 starts to operate, and after the air produced by the emergency air compressor 14 is dried by the two parallel first emergency dryers 10 and the second emergency dryers 11, the air is supplied to downstream important users (conventional island and nuclear island users); when the second dew-point meter 12 and the third dew-point meter 13 are higher or the emergency air compressor 14 is started, the corresponding first emergency dryer 10 and the second emergency dryer 11 enter continuous regeneration/adsorption operation; otherwise, the first and second emergency dryers 10, 11 reduce the regeneration frequency, and maintain the long-time adsorption mode to reduce unnecessary air consumption.
Specifically, the main air compressor 1 generates air to supply air to downstream users through the main air compressor 2, and the users of the air compression system can be divided into important users (nuclear island, air for a conventional island instrument) for controlling and adjusting compressed air by a unit and general users for overhauling and other using the compressed air. The emergency air compressor 14 does not run flat and is only started to supply air to important users when the main air supply is insufficient. The main air pressure produced by the main air dryer 2 and the emergency air compressor 14 produced by the non-drying process are dried by the first emergency dryer 10 or the second emergency dryer 11, so that parameters such as the downstream important load air supply pressure, dew point and the like are ensured to meet the requirements.
The main dryer 2 is operated and controlled in the following manner: the air produced by the main air compressor 1 is dried by the main dryer and then is respectively sent to an instrument pressure-air pipe network (important user) and an overhaul pressure-air pipe network (general user). The opening of the main dryer regeneration flow regulating valve 3 is regulated to about 50 percent so as to control the measured value of the dew point instruments (the first dew point instrument 6 and the fourth dew point instrument 7) behind the main dryer 2 (the main pressure air dryer) to be not higher than-35 ℃, thereby meeting the pressure air requirement for downstream maintenance and reducing the pressure air consumption of the main pressure air dryer through the measures.
The air pressure sent from the main dryer 2 is sent to the downstream important users after the air pressure is dried again by the emergency dryers (the first emergency dryer 10 and the second emergency dryer 11). As shown in fig. 1, a second dew point meter 12 is provided in the first emergency dryer 10 and a third dew point meter 13 is provided after the second emergency dryer 11 for monitoring the emergency dryer outlet dew point.
The emergency dryer (the first emergency dryer 10 and the second emergency dryer 11) is operated in the following control modes: the first emergency dryer 10, the second emergency dryer 11 operation mode (daily drying mode, accident drying mode) is correlated with the dryer outlet dew point meter (second dew point meter 12, third dew point meter 13) measurement value in the emergency dryer control PLC module (linkage switches the dryer to accident drying mode continuous operation when the dew point measurement value is higher than the set value, otherwise keeps the daily drying mode operation). Wherein the first emergency dryer 10 is set to enter continuous operation with the second dew point meter 12 measuring above-48 ℃; the second emergency dryer 11 is set to be continuously operated when the measured value of the third dew-point meter 13 is higher than-38 ℃ so as to ensure that the operation limit value of minus 20 ℃ has enough margin, and the phenomenon that the downstream pressure fluctuation is caused by the simultaneous starting of the two emergency dryers can be avoided. Meanwhile, the operation modes of the first emergency dryer 10 and the second emergency dryer 11 are related to the start-stop state of the emergency air compressor 14, when the emergency air compressor is started, the emergency air compressor is automatically operated in an accident drying mode by the starting signal, and otherwise, the emergency dryer is operated in a daily drying mode.
As shown in fig. 2, after the emergency dryer is put into operation, the following three conditions are first determined: whether the emergency air compressor is started, whether the dew point after the emergency dryer is higher than a set value, whether the adsorption time of the emergency dryer reaches the set value (currently, 5 hours), stopping regeneration and keeping the adsorption state unchanged if all three conditions are no, and circularly monitoring and judging the three conditions, if any one of the three conditions is yes, namely, the conditions are satisfied, the emergency dryer enters a continuous adsorption/regeneration cycle until the cycle time reaches the set value (currently, 9 minutes), namely, after the regeneration is completed, judging the three conditions again.
The emergency dryers (first emergency dryer 10, second emergency dryer 11) include a daily mode control mode, an accident mode control mode one, and an accident mode control mode two.
Daily mode control mode: when the second dew point meter 12 and the third dew point meter 13 are lower than the set values, the routine drying mode is entered, and the emergency dryer is periodically regenerated at a low frequency for reducing the pressure loss so as to maintain the adsorption performance. For monitoring the drying performance of the emergency dryer, the dryer performance can be considered to be poor when the dew point downstream of the emergency dryer is not sufficiently lowered, and the following alarm can be set if necessary: when the measured value of the first dew point instrument 6 is subtracted from the measured value of the second dew point instrument 12, the alarm of poor adsorption performance of the first emergency dryer 10 is sent out; or when the measured value of the first dew point meter 6 is subtracted from the measured value of the third dew point meter 13, the alarm of poor adsorption performance of the second emergency dryer is sent out.
Accident mode control mode one: the air humidity of the air produced by the main air compressor is higher and is in a saturated state, under the working condition of the main air compressor 2 failure, compressed air produced by the main air compressor is sent to the downstream through the first dew point meter outlet pipeline 16 without being effectively dried, at the moment, the measured values of the first dew point meter 6 and the second dew point meter 7 are both raised, and after the adsorption capacity of the first emergency dryer 10 and the second emergency dryer 11 reaches saturation, the air dew point of the downstream of the corresponding emergency dryer is raised. When the measured values of the second and third dew point gauges 12, 13 rise above the set point-48 deg.c/38 deg.c, the first and second emergency dryers 10, 11 are automatically put into continuous regeneration/adsorption operation to effectively lower the dew point.
And a second accident mode control mode: under the working condition that the emergency air compressor 14 is started, because the air generated by the emergency air compressor 14 is not dried by the main dryer 2, the air dew points of the air entering the first emergency dryer 10 and the second emergency dryer 11 are inevitably raised, and the emergency air compressor 14 starting signal is set in the emergency dryer control PLC to trigger the continuous regeneration/adsorption operation of the first emergency dryer 10 and the second emergency dryer 11 in a linkage manner so as to intervene in advance, and the rise of the outlet dew points of the emergency dryers to be above the limit value is avoided.
The emergency dryer changes the original continuous operation into daily periodic regeneration and accident continuous operation, reduces the regeneration frequency under the daily working condition, reduces the consumption of air pressure regeneration, well avoids the situation that a plurality of emergency dryers are simultaneously operated (four emergency dryers are arranged in a double unit), reduces the peak value of the air pressure consumption, and ensures that the air pressure fluctuation becomes more stable. The pressure fluctuation trend is shown in fig. 3 and 4, the pressure fluctuation amplitude of the pressure-air pipe network is reduced, the stable operation of the regulating system taking pressure air as power is facilitated, the operation reliability of the regulating system is improved, and the reliability of the important regulating system is related to the safe operation of the unit.
The original main pressure air dryer and the emergency pressure air dryer are continuously operated, and the pressure air consumption is high in the regeneration process of the dryer. According to the invention, the dew point meter is arranged behind the emergency air dryer, so that the operation mode of the emergency air dryer is related to the dew point value, the emergency air dryer is operated continuously under the accident condition of starting the emergency air dryer, and the air dew point for the meter is ensured; the daily operation working condition is different from the important and non-important user demands, the loss of air is reduced by reducing the regeneration flow of the main air compressor dryer and the regeneration frequency of the emergency air compressor dryer, once the emergency air compressor is started or the dew point measured value reaches a set value after the emergency air compressor dryer, the emergency air compressor dryer is automatically switched to continuously operate, and the dew point safety demands of the air important users are met.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (1)
1. The control method of the nuclear power plant air-pressure production system is characterized by comprising the nuclear power plant air-pressure production system, wherein the nuclear power plant air-pressure production system comprises a main air compressor (1), a main dryer (2) and a first dew-point meter (6) which are sequentially connected through pipelines, and an emergency air compressor (14), a first emergency dryer (10) and a second dew-point meter (12) which are sequentially connected through pipelines; one end of the middle pipeline (15) is connected to the downstream of the first dew point meter outlet pipeline (16), and the other end of the middle pipeline is connected to the emergency air compressor outlet pipeline (17);
a second branch (8) with a second emergency dryer (11) and a third dew-point meter (13) is connected in parallel on a first branch (5) where the first emergency dryer (10) and the second dew-point meter (12) are located; the outlet of the main trunk device (2) is connected with 2 main trunk device outlet pipelines in parallel, and a main trunk device regeneration flow regulating valve (3) is connected between the 2 main trunk device outlet pipelines; a gas production check valve (4) is arranged on the outlet pipeline of the main body device;
the nuclear power plant pressure air production system further comprises a fourth dew point meter outlet pipeline (9) connected in parallel with the first dew point meter outlet pipeline (16), and a fourth dew point meter (7) is arranged on the fourth dew point meter outlet pipeline (9);
the control method comprises the following steps:
step S1: the main air compressor (1) is operated, the emergency air compressor (14) is not operated, and the gas generated by the main air compressor (1) is supplied to important users and general users downstream through the main air compressor (2);
step S2: when the main air compressor (1) is in insufficient supply, the emergency air compressor (14) starts to operate, and after the gas produced by the emergency air compressor (14) is dried by the two first emergency dryers (10) and the second emergency dryers (11) which are connected in parallel, the air is supplied to downstream important users; -the first emergency dryer (10) is put into continuous operation when the second dew point meter (12) measurement is above-48 ℃, and-the second emergency dryer (11) is put into continuous operation when the third dew point meter (13) measurement is above-38 ℃; or after the emergency air compressor (14) is started, the corresponding first emergency dryer (10) and the corresponding second emergency dryer (11) enter continuous regeneration/adsorption operation; otherwise, the first emergency dryer (10) and the second emergency dryer (11) reduce the regeneration frequency, and maintain the long-time adsorption mode so as to reduce the air consumption.
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