CN216778421U - Membrane separation type nitrogen making system for ship - Google Patents
Membrane separation type nitrogen making system for ship Download PDFInfo
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- CN216778421U CN216778421U CN202122874121.7U CN202122874121U CN216778421U CN 216778421 U CN216778421 U CN 216778421U CN 202122874121 U CN202122874121 U CN 202122874121U CN 216778421 U CN216778421 U CN 216778421U
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Abstract
The utility model discloses a membrane separation type nitrogen making system for a ship, which comprises a gas supply and treatment unit and a separation membrane unit; the separation membrane unit comprises a gas collecting chamber, a separation chamber and a gas collecting chamber which are sequentially arranged at intervals along the axial direction of the separation membrane unit; the gas gathering chamber is provided with a first inlet communicated with the gas supply and processing unit; the gas collection chamber is provided with a first outlet communicated with the outside; a plurality of hollow fiber membranes are arranged in the separation chamber at intervals, and each hollow fiber membrane is communicated with the gas collecting chamber and the gas collecting chamber at two ends of the hollow fiber membrane respectively; a separation structure which limits the inner space of the separation chamber into a circuitous gas path is arranged in the separation chamber; the separation chamber is provided with a second outlet and a second inlet which are respectively arranged at the upstream and the downstream of the circuitous gas path in a communicating way. The utility model improves the membrane separation efficiency of oxygen and nitrogen.
Description
Technical Field
The utility model relates to the field of ship safety, in particular to a membrane separation type nitrogen production system for a ship.
Background
The nitrogen is an ideal inert gas, the common nitrogen and the high-purity nitrogen are widely applied to ships, and the nitrogen is not separated from the inert purging of the hold space on the ship, the combustion suppression and explosion prevention of the hold space on the ship, the corrosion prevention of instruments and meters, the pressurization of a gas accumulator and the driving of a mechanical and hydraulic system and the inert purging of the installation and maintenance of a fuel oil pipeline.
Nitrogen used in the ship industry is often directly extracted from air by installing a nitrogen production device, and the membrane separation type nitrogen production equipment is widely applied to cargo hold purging of oil tankers and chemical tankers and gas supply systems of liquid cargo ships due to the advantages of small volume, high nitrogen production speed, low failure rate and the like.
Gas membrane separation is achieved by using the difference in partial pressure of different gas molecules across the membrane and the difference in velocity as the gas moves from the high pressure side through the membrane to the low pressure side. Oxygen, carbon dioxide, water vapor and the like can rapidly permeate the membrane and are discharged to the open deck through the oxygen-enriched exhaust port, and nitrogen which does not easily permeate the membrane flows to the other end from one end inside the membrane wire and is collected, so that nitrogen is obtained at the outlet end. The process is a complex process of 'dissolving and diffusing', the membrane entering pressure, temperature change, raw material gas flow and the like can also influence the membrane separation process, the flow is difficult to adjust under the influence of a demand end in actual use, the cost of the gas supply unit is greatly increased due to the increase of the membrane entering pressure, and therefore the increase of the membrane separation efficiency by adjusting the partial pressure difference of different component gases is a simple, convenient and feasible means for preparing high-purity nitrogen.
Meanwhile, in order to ensure continuous and stable output of high-purity nitrogen in the nitrogen making process, the opening of the regulating valve needs to be automatically adjusted according to the requirements of process conditions and product nitrogen performance indexes. Due to the complexity of the gas film process and the difference of the nitrogen purity, the nitrogen purity variation generated by reducing the opening of the regulating valve by the same amplitude is different, and the feedback has lag, so that the nitrogen purity is often regulated untimely or excessively, and the nitrogen purity is regulated for a long time and has large fluctuation.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a membrane separation type nitrogen making system for a ship, which can solve the technical problems that a large amount of oxygen-enriched gas is enriched in the bottom of the existing nitrogen making system and cannot be discharged, a flow dead zone exists, the separation rate of oxygen and nitrogen is reduced, and the like.
In order to achieve the aim, the utility model provides a membrane separation type nitrogen production system for a ship, which comprises a gas supply and treatment unit and a separation membrane unit; the separation membrane unit comprises a gas collecting chamber, a separation chamber and a gas collecting chamber which are sequentially arranged at intervals along the axial direction of the separation membrane unit; the gas gathering chamber is provided with a first inlet communicated with the gas supply and processing unit; the gas collection chamber is provided with a first outlet communicated with the outside; a plurality of hollow fiber membranes are arranged in the separation chamber at intervals, and each hollow fiber membrane is communicated with the gas collecting chamber and the gas collecting chamber at two ends of the hollow fiber membrane respectively; a separation structure which limits the inner space of the separation chamber into a circuitous gas path is arranged in the separation chamber; the separation chamber is provided with a second outlet and a second inlet which are respectively arranged at the upstream and the downstream of the circuitous gas path in a communicating way.
Further, the partition structure is composed of at least one partition subset, each partition subset including a pair of partition plates arranged in a relatively staggered manner on an inner side wall of the separation chamber; a pair of separation plates in each subset of the separations are spaced apart from one another, each separation plate extending from one of the sides of the separation chamber in a direction perpendicular to the axis toward the opposite side and terminating before contacting the opposite side to form the circuitous gas path of at least one S-turn between the second outlet, the separation structure, and the second inlet.
Further, the second outlet is arranged on the same side of the fixed end of the partition plate closest to the second outlet; the second inlet is arranged on the same side of the fixed end of the partition plate closest to the second inlet.
Further, the first outlet and the first inlet are arranged away from each other, and two ends of the hollow fiber membrane are respectively arranged relative to the first inlet and the first outlet; the first inlet and the second outlet are arranged adjacently; the first outlet is arranged adjacent to the second inlet in a non-coplanar manner.
Further, the membrane separation type nitrogen generation system for the ship further comprises: the device comprises a pressure reducing device, a regulating valve, an oxygen analyzer and an electromagnetic valve; one end of the gas supply and treatment unit is connected to the first inlet; one end of the regulating valve is connected to the first outlet; one end of the oxygen analyzer is connected to the second inlet, and the other end of the oxygen analyzer is connected to the pressure reducing device; one end of the pressure reducing device, which is far away from the oxygen analyzer, is connected to one end of the regulating valve, which is far away from the first outlet; and one end of the electromagnetic valve is connected to one end, far away from the first outlet, of the regulating valve.
Further, the gas enters the gas supply and processing unit to form pure compressed air; the pure compressed air enters the separation membrane unit from the first inlet, wherein oxygen is enriched in the separation chamber during the flowing process of the hollow fiber membranes and is discharged from the second outlet, and nitrogen is enriched in the hollow fiber membranes and is discharged from the first outlet along the flowing route of the hollow fiber membranes; and a part of the nitrogen discharged from the first outlet is discharged sequentially through the regulating valve and the solenoid valve.
Further, a part of the gas discharged from the regulating valve is decompressed by the pressure reducing device to become low-pressure nitrogen-rich gas, the low-pressure nitrogen-rich gas passes through the oxygen analyzer and enters the separation membrane unit from the second inlet, the separation chamber is purged, dead zone oxygen-rich gas flows at the tail end of the separation membrane, and the oxygen-rich gas in the separation chamber is discharged from the second outlet.
Further, the second outlet is used for discharging oxygen-enriched gas; the solenoid valve is used for discharging nitrogen.
Further, the solenoid valve comprises a first solenoid valve and a second solenoid valve; the first electromagnetic valve and the second electromagnetic valve are connected to one end, far away from the first outlet, of the regulating valve through a three-way connecting piece; the first electromagnetic valve is used for discharging high-purity nitrogen; the second electromagnetic valve is used for discharging unqualified nitrogen.
The utility model has the technical effects that the oxygen-enriched gas flow dead zone outside the hollow fiber membrane is reduced through nitrogen purging, the partial pressure of oxygen outside the hollow fiber membrane is reduced, and the partial pressure of nitrogen is increased, so that the partial pressure difference of oxygen inside and outside the membrane is increased, the partial pressure difference of nitrogen on two sides of the membrane is reduced, oxygen can permeate the membrane more easily, the permeation efficiency of nitrogen is reduced, the oxygen-enriched gas in the nitrogen preparation process can be pushed to be discharged in time, the nitrogen purity and the separation efficiency are improved, and high-purity nitrogen can be stably and continuously output.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a membrane separation type nitrogen production system for a ship provided by an embodiment of the utility model;
FIG. 2 is a schematic structural diagram of a separation membrane unit provided in an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of another separation membrane unit provided in an embodiment of the present invention;
fig. 4 is a schematic diagram of an application method of a membrane separation type nitrogen production system for a ship provided by an embodiment of the utility model.
Description of reference numerals:
100. a gas supply and processing unit; 200. a separation membrane unit; 300. a pressure reducing device; 400. adjusting a valve; 500. an oxygen analyzer; 600. an electromagnetic valve;
201. a first inlet; 202. a first outlet; 203. a second inlet; 204. a second outlet; 205. a hollow fiber membrane; 206. a first partition plate; 207. a second partition plate;
610. a first solenoid valve; 620. a second solenoid valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Furthermore, it should be understood that the detailed description herein is intended only to illustrate and explain the present invention, and is not intended to limit the present invention. In the present invention, unless otherwise specified, the use of directional terms such as "upper" and "lower" generally means upper and lower in the actual use or operation of the device, particularly in the orientation of the figures of the drawings; while "inner" and "outer" are with respect to the outline of the device.
As shown in fig. 1 to 3, an embodiment of the present invention provides a membrane separation type nitrogen generation system for a ship and a nitrogen generation method using the same. The following are detailed below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments.
The membrane separation type nitrogen production system for the ship comprises a gas supply and treatment unit 100, a separation membrane unit 200, a pressure reduction device 300, a regulating valve 400, an oxygen analyzer 500, an electromagnetic valve 600 and the like. The membrane separation type nitrogen making system for the ship is used for separating oxygen and nitrogen in air and extracting to obtain high-concentration nitrogen.
The air supply and processing unit 100 processes the introduced bleed air to generate dry and pure compressed air and to reduce the oil mist, dust content and dew point temperature therein, so as to prevent impurities in the air from causing the separation membrane unit 200 to be contaminated.
As shown in fig. 2 and 3, the separation membrane unit 200 has a selective permeability and is used for separating oxygen and nitrogen, and the separation membrane unit 200 includes a gas collecting chamber, a separation chamber, and a gas collecting chamber which are sequentially arranged at intervals along an axial direction of the separation membrane unit 200.
The gas collecting chamber is provided with a first inlet 201 communicated with the gas supply and processing unit 100, and the gas collecting chamber is provided with a first outlet 202 communicated with the outside; a plurality of hollow fiber membranes 205 are arranged at intervals in the separation chamber, and each hollow fiber membrane 205 is respectively communicated with the gas collecting chamber and the gas collecting chamber at two ends thereof. A separation structure which limits the inner space of the separation chamber into a circuitous gas path is arranged in the separation chamber; the separation chamber is provided with a second outlet 204 and a second inlet 203 which are respectively arranged at the upstream and the downstream of the circuitous gas path in a communicating way.
The partition structure is composed of at least one partition subset, each partition subset includes a pair of partition plates oppositely staggered on the inner side wall of the separation chamber, the pair of partition plates in each partition subset are spaced from each other, each partition plate extends from one side of the separation chamber to the opposite side along the direction perpendicular to the axis and terminates before contacting with the opposite side, respectively a first partition plate 206 and a second partition plate 207 in fig. 2, so as to form the circuitous air path composed of one S-turn among the second outlet 204, the partition structure and the second inlet 203, the circuitous air path is shown by dotted lines in fig. 2, so that the gas entering from the second inlet 203 is discharged from the second outlet 204.
As shown in fig. 3, in other embodiments of the present application, the sub-set of partitions includes two pairs of partition plates, each pair of partition plates is arranged in a staggered manner, and a circuitous air path formed by two S-bends is formed, and the circuitous air path is shown by a dotted line in fig. 3. In the present application, there may also be a plurality of pairs of partition plates, forming at least two S-bends forming a circuitous air path for the gas entering from the second inlet 203 to exit from the second outlet 204.
Specifically, the following will describe in detail a separation membrane unit 200 having only a pair of partition plates, i.e., with reference to fig. 2.
The separation membrane unit 200 is a cylindrical structure, and two opposite sides thereof are defined as a first side and a second side, respectively, and the rest are circumferential surfaces. The first inlet 201 is disposed at a first side surface of the separation membrane unit 200, the second inlet 203 is disposed on a circumferential surface of the separation membrane unit 200, the first outlet 202 is disposed at a second side surface of the separation membrane unit 200, the second outlet 204 is disposed on the circumferential surface of the separation membrane unit 200, and the second inlet 203 and the second outlet 204 are respectively disposed at two ends of the circumferential surface, and are two ports disposed at an interval of 180 ° on the circumference, specifically, the second inlet 203 is disposed at one end close to the second side surface, the second outlet 204 is disposed at one end close to the first side surface, and the second inlet 203 and the second outlet 204 are diagonally disposed.
Further, the second outlet 204 is disposed on the same side of the fixed end of the second partition plate 207 closest to the second outlet, the second inlet 203 is disposed on the same side of the fixed end of the first partition plate 206 closest to the second outlet, the first outlet 202 and the first inlet 201 are disposed away from each other, two ends of the hollow fiber membrane 205 are disposed opposite to the first inlet 201 and the first outlet 202, the first inlet 201 and the second outlet 204 are disposed adjacent to each other in different surfaces, and the first outlet 202 and the second inlet 203 are disposed adjacent to each other in different surfaces.
One end of the regulating valve 400 is connected to the first outlet 202, and the other end thereof is connected to a three-way connection, which is connected to a first solenoid valve 610 and a second solenoid valve 620, respectively. The regulating valve 400 is installed on a nitrogen main pipeline, and the residence time of pure compressed air in the hollow fiber membranes 205 is changed by regulating the opening degree, so that the permeation gas (oxygen) is sufficiently permeated to the outside of the hollow fiber membranes 205 under the push of the partial pressure difference so as to be discharged from the second outlet 204, and the residual gas (nitrogen) is enriched in the hollow fiber membranes 205 and discharged from the plenum at the end of the separation membrane unit 200 to the nitrogen main pipeline, i.e., the regulating valve 400.
One end of the pressure reducing device 300 is connected to the nitrogen main pipeline, the other end is connected to an oxygen analyzer 500, and one end of the oxygen analyzer 500 far away from the pressure reducing device 300 is communicated to the second inlet 203 of the separation membrane unit 200.
A nitrogen production method for producing nitrogen using a marine membrane separation type nitrogen production system is explained below.
Bleed air or air from the upper reaches follow air feed and processing unit 100 lets in, forms pure compressed air after handling, and this pure compressed air follow first entry 201 lets in to in the gather gas chamber of split-film unit 200 and the warp hollow fiber membrane 205 is collected in the plenum, pure compressed air is in the in-process that flows in hollow fiber membrane 205, oxygen sees through enrich behind the hollow fiber membrane 205 in the split-chamber, and follow second export 204 is discharged, and nitrogen gas is in enrich in the hollow fiber membrane 205, and follow hollow fiber membrane 205 channels into in the plenum, follow finally first export 202 is discharged.
The nitrogen discharged from the first outlet 202 is adjusted by the adjusting valve 400 to change the purity, the nitrogen having an unacceptable purity generated during the start-up process is discharged from the second solenoid valve 620, and the high purity nitrogen generated after the stable operation is discharged from the first solenoid valve 610. Since the oxygen analyzer 500 in this embodiment is configured with a measuring chamber, a part of high purity nitrogen gas is led out from the nitrogen main pipeline, decompressed by the decompression device 300, and enters the oxygen analyzer 500, and the oxygen analyzer 500 detects the oxygen content of the gas and increases or decreases the opening of the regulating valve 400 in real time according to the oxygen content, so as to adjust the purity of the nitrogen gas in the gas collecting chamber, thereby generating high purity nitrogen gas, or nitrogen-rich gas with low oxygen content. And part of the low-pressure high-purity nitrogen gas used for detection by the oxygen analyzer 500 is introduced from the oxygen analyzer 500 to the second inlet 203 of the separation membrane unit 200 to purge the oxygen-enriched gas in the separation chamber.
In the primary separation process of the pure compressed air, a large amount of oxygen-enriched gas permeating through the hollow fiber membrane 205 is enriched outside the hollow fiber membrane 205 and distributed along the length direction of the hollow fiber membrane 205, because the second inlet 203 is far away from the second outlet 204, the part of the oxygen-enriched gas enriched near the second inlet 203 cannot be directly discharged from the second outlet 204, and can stagnate and accumulate in the separation chamber in the nitrogen making process, and the oxygen-enriched gas can grow more and more, so that the partial pressure of oxygen outside the hollow fiber membrane near the rear half section of the separation chamber is higher, the pushing force (or the pressure difference) of the oxygen permeating through the hollow fiber membrane 205 is smaller, the separation of the nitrogen and the oxygen is not facilitated, and the separation efficiency is reduced.
In this embodiment, the oxygen-rich gas gathered nearby is purged by the low-oxygen nitrogen-rich gas entering from the second inlet 203, so that the oxygen-rich gas can be pushed to flow again, the partial pressure of oxygen outside the hollow fiber membrane 205 is reduced, the partial pressure of nitrogen is increased, the pushing force of oxygen penetrating through the hollow fiber membrane 205 is increased, the permeation pushing force of nitrogen is reduced, and the membrane separation efficiency of oxygen and nitrogen is enhanced. Under the drive of the low-pressure nitrogen-rich gas, the gas outside the hollow fiber membrane 205 is finally discharged from the second outlet 204 after flowing through the aforementioned circuitous gas path, which is beneficial to reducing the flow dead zone and reducing the problem of membrane separation efficiency reduction caused by gas concentration polarization.
The technical effects of the membrane separation type nitrogen making system for the ship and the nitrogen making method for making nitrogen by using the same are that the flowing dead zone of oxygen-enriched gas outside the hollow fiber membrane is reduced by nitrogen purging, the partial pressure of oxygen outside the hollow fiber membrane is reduced, and the partial pressure of nitrogen is increased, so that the partial pressure difference of oxygen inside and outside the membrane is increased, the partial pressure difference of nitrogen on two sides of the membrane is reduced, oxygen can permeate the membrane more easily, the permeation efficiency of nitrogen is reduced, oxygen-enriched gas in the nitrogen making process can be pushed to be discharged in time, the nitrogen purity and the separation efficiency are improved, and high-purity nitrogen can be stably and continuously output.
As shown in fig. 4, an embodiment of the present invention further provides an application method of a marine membrane separation type nitrogen generating system, where the application method is a method for automatically adjusting and optimizing the nitrogen purity of a product by controlling the opening of a regulating valve, and the application method specifically includes steps S1 to S4, where the influences of a change Δ e of an oxygen content and a change rate de are considered when adjusting the nitrogen purity.
S1 setting the initial opening of the regulating valve according to the nitrogen purity required by the user and measuring the current first oxygen content e0. Specifically, acquiring an oxygen content set value e input by a usersetRecording the value (e) according to the opening degree at the time of the previous output of the same oxygen contentset，EV’n) Setting the initial opening degree EV of the proportional valve, and measuring the current oxygen content e0。
And S2, calculating the variation and the variation rate of the oxygen content after a period of time, obtaining the opening adjustment U and the delay T of the adjusting valve, reducing or increasing the amplitude of the opening U of the adjusting valve, and waiting for the delay time T seconds. In this embodiment, taking an interval of 3 seconds as an example, the difference Δ e between the set value of the oxygen content and the measured value is calculated from the current oxygen content e measured by the oxygen analyzersetThe rate of change of oxygen content de ═ e (e-e)0)/t。
S3 measuring the second oxygen content e 'after T seconds, judging whether the second oxygen content e' is equal to the set oxygen content value esetAnd the oxygen content change rate does not exceed 5 percent, if not, the adjustment process is circulated until the oxygen content e converges. Specifically, an adjustment amount U and a delay time T of the opening degree of the regulator valve are obtained from the opening degree adjustment rule table corresponding to the magnitude of Δ e and de, the regulator valve opening degree is adjusted to EV '(EV' ═ EV-U), and a delay time T seconds is waited. Measuring the oxygen content e 'after the time delay is finished, and judging whether e' is equal to esetAnd de is not more than 5%. If not, e does not converge, and e' is regarded as e0Then, the process proceeds to S2, and loops S2-3 until e converges.
S4, when the oxygen content e is converged, judging whether the current gas utilization state is a gas utilization stopping state, if so, ending the adjustment and shutting down. Specifically, if e converges, whether the current gas utilization state is the gas utilization stop state is judged, if not, S2-3 is continuously circulated, the regulating valve cannot be regulated within the range of qualified oxygen content, but if delta e or de changes due to fluctuation of the working environment or the system state of the nitrogen production system in the circulation process, the opening degree can be corrected in time, and continuous and stable output of high-purity nitrogen gas is ensured.
The application method of the marine membrane separation type nitrogen generation system has the technical effects that the opening degree is adjusted by comprehensively considering the influences of the variation delta e and the variation rate de of the oxygen content, the adjustment and reaction time is shortened, and the starting time of the nitrogen generation system is shortened. The nitrogen making system has strong adaptability to the pressure fluctuation and temperature change of the air entering the membrane, can automatically adjust the opening of the adjusting valve in real time, and ensures continuous and stable output of qualified high-purity nitrogen.
The embodiments of the present invention provide a membrane separation type nitrogen generating system for a ship, and the principles and embodiments of the present invention are explained in detail herein, and the above description of the embodiments is only used to help understanding the method and the core concept of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. A membrane separation type nitrogen production system for a ship is characterized by comprising a gas supply and treatment unit (100) and a separation membrane unit (200);
the separation membrane unit (200) comprises a gas collecting chamber, a separation chamber and a gas collecting chamber which are sequentially arranged at intervals along the axial direction of the separation membrane unit;
wherein the gas gathering chamber is provided with a first inlet (201) communicated with the gas supply and treatment unit (100); the gas collection chamber is provided with a first outlet (202) communicated with the outside; a plurality of hollow fiber membranes (205) are arranged in the separation chamber at intervals, and each hollow fiber membrane (205) is respectively communicated with the gas collecting chamber and the gas collecting chamber at two ends of the hollow fiber membrane; a separation structure which limits the inner space of the separation chamber into a circuitous gas path is arranged in the separation chamber; the separation chamber is provided with a second outlet (204) and a second inlet (203) which are respectively arranged at the upstream and the downstream of the circuitous gas path in a communicating way.
2. The marine membrane-separation nitrogen generation system according to claim 1,
the separation structure is composed of at least one separation subset, each separation subset comprises a pair of separation plates which are oppositely staggered on the inner side wall of the separation chamber; a pair of separation plates in each subset of partitions are spaced from each other, each separation plate extending from one of the sides of the separation chamber in a direction perpendicular to the axis towards the opposite side and terminating before contacting the opposite side to form the circuitous gas path of at least one S-turn between the second outlet (204), the separation structure and the second inlet (203).
3. The marine membrane-separation nitrogen generation system according to claim 2,
the second outlet (204) is arranged on the same side of the fixed end of the partition plate closest to the second outlet;
the second inlet (203) is arranged on the same side as the fixed end of the partition plate closest thereto.
4. The marine membrane-separation nitrogen generation system according to claim 1,
the first outlet (202) and the first inlet (201) are arranged away from each other, and two ends of the hollow fiber membrane (205) are respectively arranged relative to the first inlet (201) and the first outlet (202);
the first inlet (201) is arranged opposite to the second outlet (204);
the first outlet (202) is arranged opposite to the second inlet (203).
5. The marine membrane-separation-type nitrogen generation system according to claim 1, further comprising: a pressure reducing device (300), a regulating valve (400), an oxygen analyzer (500) and an electromagnetic valve (600);
one end of the gas supply and treatment unit (100) is connected to the first inlet (201);
one end of the regulating valve (400) is connected to the first outlet (202);
one end of the oxygen analyzer (500) is connected to the second inlet (203), and the other end of the oxygen analyzer is connected to the pressure reducing device (300);
one end of the pressure reducing device (300) far away from the oxygen analyzer (500) is connected to one end of the regulating valve (400) far away from the first outlet (202); and
one end of the solenoid valve (600) is connected to the end of the regulating valve (400) remote from the first outlet (202).
6. The marine membrane-separation nitrogen generation system according to claim 5,
the gas enters the gas supply and processing unit (100) to form pure compressed air;
the pure compressed air enters the separation membrane unit (200) from the first inlet (201), wherein oxygen is enriched in the separation chamber during the flow of the hollow fiber membranes (205) and is discharged from the second outlet (204), and nitrogen is enriched in the hollow fiber membranes (205) and is discharged at the first outlet (202) along the flow route of the hollow fiber membranes (205);
a part of the nitrogen gas discharged from the first outlet (202) is discharged sequentially through the regulating valve (400) and the solenoid valve (600).
7. The marine membrane-separation nitrogen generation system according to claim 5,
a part of the gas discharged from the regulating valve (400) is decompressed by the decompressing device (300) to become low-pressure nitrogen-rich gas, the low-pressure nitrogen-rich gas enters the separation membrane unit (200) from the second inlet (203) after passing through the oxygen analyzer (500), oxygen-rich gas flowing dead zones at the tail ends of the separation membranes is purged in the separation chambers, and the oxygen-rich gas in the separation chambers is exhausted from the second outlet (204).
8. The marine membrane-separation nitrogen generation system according to claim 5,
the second outlet (204) is for discharging an oxygen-enriched gas;
the solenoid valve (600) is used for discharging nitrogen.
9. The marine membrane-separation nitrogen generation system according to claim 5,
the solenoid valve (600) comprises a first solenoid valve (610) and a second solenoid valve (620);
the first solenoid valve (610) and the second solenoid valve (620) are connected to one end, away from the first outlet (202), of the regulating valve (400) through a three-way connection;
the first electromagnetic valve (610) is used for discharging high-purity nitrogen;
the second solenoid valve (620) is used for discharging unqualified nitrogen.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114307561A (en) * | 2021-11-22 | 2022-04-12 | 中国船舶重工集团公司第七一一研究所 | Membrane separation type nitrogen production system for ship and nitrogen production method and application method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114307561A (en) * | 2021-11-22 | 2022-04-12 | 中国船舶重工集团公司第七一一研究所 | Membrane separation type nitrogen production system for ship and nitrogen production method and application method thereof |
| CN114307561B (en) * | 2021-11-22 | 2023-08-15 | 中国船舶集团有限公司第七一一研究所 | Marine membrane separation type nitrogen production system and nitrogen production method thereof |
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