CN219580077U - Marine membrane separation nitrogen making system - Google Patents

Abstract

The utility model relates to a membrane separation nitrogen production system for a ship. The device comprises a control system, an air compression module, a separation module and a nitrogen storage module, wherein the air compression module comprises an air compressor and an air buffer tank connected to the rear end of the air compressor; the separation module comprises a filter assembly, a heater and a membrane assembly which are sequentially communicated, the filter assembly is connected to the rear end of the air buffer tank, the permeation side of the membrane assembly is communicated with the atmosphere through a first exhaust pipeline, the detention side of the membrane assembly is connected with two pipelines, one pipeline is a second exhaust pipeline, and the second pipeline can be communicated with the nitrogen storage module; the other pipeline is a third exhaust pipeline which can be communicated with the atmosphere. The marine membrane separation nitrogen production system provided by the utility model has the advantages of compact structure and small occupied area; the operation is simple, and qualified nitrogen can be obtained in a short time after the start-up; the device does not contain moving parts, has low failure rate and high operation reliability; the system has low running cost, no noise and no pollution.

Description

Marine membrane separation nitrogen making system

Technical Field

The utility model particularly relates to a membrane separation nitrogen production system for a ship.

Background

Nitrogen, which is a substance with stable physical and chemical properties, is increasingly used in industrial production and daily life such as electronics, chemistry, fire protection, food, etc. In the marine industry, nitrogen occupies an extremely important position in inert gas explosion-proof systems. The membrane separation nitrogen production system for the ship becomes an indispensable system for guaranteeing the safety of the ship.

The membrane separation nitrogen production technology can supply uninterrupted gaseous nitrogen under normal temperature. The aim of generating high-purity nitrogen is achieved by filtering nitrogen through millions of fibers similar to human hair in the compressed dry air flow. The purity requirement of the marine nitrogen is very high, if the oxygen content in the nitrogen is too high, explosion is easy to happen, and therefore, the stepwise separation and purification are carried out by the design of multi-level membrane separation. Meanwhile, under the emergency, the membrane separation nitrogen production system for the ship needs to be capable of running rapidly, efficiently and stably, and the purity and flow of nitrogen are ensured. Therefore, the existing membrane separation nitrogen production system for the ship generally comprises a plurality of instruments and pipelines, however, the space of the ship is limited, and in order to ensure the activity space of personnel on the ship, the space for accommodating the nitrogen production machine and the like, the space proportion is continuously compressed, so that the development of the membrane separation nitrogen production system for the ship with more compact structure, smaller occupied area, better stability and higher operation efficiency is required under the condition of ensuring the purity and flow of nitrogen.

Disclosure of Invention

The utility model aims to provide a marine membrane separation nitrogen production system which has a compact structure, high purity and high efficiency and stability.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the marine membrane separation nitrogen production system comprises a control system, an air compression module, a separation module and a nitrogen storage module;

the air compression module comprises an air compressor and an air buffer tank connected to the rear end of the air compressor;

the separation module comprises a filter assembly, a heater and a membrane assembly which are sequentially communicated, the filter assembly is connected to the rear end of the air buffer tank, the permeation side of the membrane assembly is communicated with the atmosphere through a first exhaust pipeline, the detention side of the membrane assembly is connected with two pipelines, one pipeline is a second exhaust pipeline, and the second pipeline can be communicated with the nitrogen storage module; the other pipeline is a third exhaust pipeline which can be communicated with the atmosphere, the second exhaust pipeline and the third exhaust pipeline are respectively provided with a first exhaust valve component and a second exhaust valve component for controlling the on-off of the second exhaust pipeline and the third exhaust pipeline,

a concentration detector is connected between the detention side of the membrane component and the two pipelines, the concentration detector is connected with the control system, when the concentration detector detects that the nitrogen concentration of the detention side of the membrane component is greater than or equal to a set value, the first exhaust valve component can be controlled to be opened so that the second exhaust pipeline is in a state of being communicated with the nitrogen storage module, and the second exhaust valve component can be controlled to be closed so that the third exhaust pipeline is in a state of being disconnected from the atmosphere; when the concentration detector detects that the nitrogen concentration on the detention side of the membrane module is smaller than a set value, the first exhaust valve assembly can be controlled to be closed so that the second exhaust pipeline is in a state of being disconnected from the nitrogen storage module, and the second exhaust valve assembly can be controlled to be opened so that the third exhaust pipeline is in a state of being communicated with the atmosphere.

Preferably, part or all of the valves in the first and second exhaust valve assemblies are controlled by the control system respectively.

Preferably, the filter assembly comprises a first filter, a freeze dryer, a second filter, a third filter and a fourth filter which are sequentially communicated, wherein the filtering precision of the first filter is more than or equal to that of the second filter, and the filtering precision of the third filter is more than or equal to that of the fourth filter. Unless otherwise specified, the smaller the value of the filtering accuracy in the present utility model, the higher the accuracy thereof.

Further, the first filter is a centrifugal oil-water separator, and the filtering precision of the first filter is less than or equal to 3 mu m.

Further, the second filter is a main pipeline filter, and the filtering precision of the second filter is less than or equal to 1 mu m.

Further, the third filter is an activated carbon adsorption filter, and the filtering precision of the third filter is less than or equal to 0.01 mu m.

Further, the fourth filter is a micro oil filter, and the filtering precision of the fourth filter is less than or equal to 0.01 mu m.

Preferably, the marine membrane separation nitrogen production system further comprises a dew point meter arranged on a pipeline for communicating the filter assembly and the heater, the dew point meter is connected with the control system, the pipeline for communicating the filter assembly and the heater can be communicated with the atmosphere, and when the dew point meter detects that the dew point in the pipeline is smaller than or equal to a set value, the pipeline for communicating the filter assembly and the heater is in a state of being disconnected from the atmosphere; when the dew point in the dew point detection pipeline is larger than a set value, the pipeline which is communicated with the filter component and the heater is in a state of being communicated with the atmosphere, so that the pipeline which is communicated with the filter component and the heater is emptied.

Preferably, a vent valve which can be opened or closed is arranged on a pipeline or at the rear end of the pipeline which is used for communicating the filter assembly with the heater.

Further, the vent valve is controlled by the control system.

Preferably, the membrane module comprises a plurality of membrane separators arranged in parallel.

Further, the separation membrane used in the membrane assembly is a hollow fiber membrane.

Further, the membrane assembly comprises two membrane separators arranged in parallel.

Preferably, the marine membrane separation nitrogen production system further comprises a first temperature detection device for detecting temperature, wherein the first temperature detection device is arranged on the heater and connected with the control system.

Preferably, the marine membrane separation nitrogen production system further comprises a second temperature detection device for detecting temperature, the second temperature detection device is arranged on a pipeline at the inlet side of the membrane assembly and connected with the control system, an air inlet valve and an air outlet valve are arranged on the pipeline between the second temperature detection device and the membrane assembly, and when the second temperature detection device detects that the temperature is greater than a set value, the air outlet valve is in an open state, and the air inlet valve is in a closed state; when the temperature detected by the second temperature detection device is smaller than or equal to a set value, the emptying valve is in a closed state, and the air inlet valve is in an open state.

Preferably, the nitrogen storage module comprises a nitrogen buffer tank.

Preferably, the marine membrane separation nitrogen making system further comprises a cooling water module, wherein the water outlet of the cooling water module is respectively communicated with the air compressor and the cooling water inlet of the freeze dryer in the filter assembly through pipelines, and the water inlet of the cooling water module is respectively communicated with the air compressor and the cooling water outlet of the freeze dryer in the filter assembly through pipelines.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

the marine membrane separation nitrogen production system provided by the utility model has compact structure and small occupied area through modular design; the operation is simple, and qualified nitrogen can be obtained in a short time after the start-up; the device does not contain moving parts, has low failure rate and high operation reliability; the system has low running cost, no noise and no pollution.

Drawings

FIG. 1 is a schematic diagram of a membrane separation nitrogen production system for a ship according to an embodiment,

1, an air compressor; 2. an air buffer tank; 3. a first filter; 4. a freeze dryer; 5. a second filter; 6. a third filter; 7. a fourth filter; 8. a heater; 81. a first heater temperature detector; 82. a second heater temperature detector; 9. a membrane module; 10. a nitrogen buffer tank;

11. a first main line; 111. a first main line pressure indicator; 112. a first main line temperature detector; 113. a first main line ball valve;

12. a second main line; 121. a dew point meter; 122. a dew point meter pressure reducing valve; 123. a dew point meter ball valve; 124. a second main pipeline first ball valve; 125. a second main line relief valve; 126. a second main pipeline second ball valve;

13. a third main line; 131. a third main line pressure indicator; 132. a third main line temperature detector; 133. a third main pipeline ball valve; 134. a third main line first pneumatic valve; 135. a third main line second pneumatic valve;

14. a fourth main line; 141. a concentration detector; 142. a flow meter; 143. a fourth main line shut-off valve; 144. a fourth main line back pressure valve;

15. a fourth main pipeline first exhaust pipe; 151. a fourth main pipeline first exhaust pipe pneumatic valve; 152. a fourth main pipeline first exhaust pipe ball valve;

16. a fourth main pipeline second exhaust pipe; 161. a fourth main pipeline second exhaust pipe first pressure indicator; 162. a fourth main pipeline second exhaust pipe pneumatic valve; 163. a second exhaust pipe one-way valve of the fourth main pipeline; 164. a second pressure indicator of a second exhaust pipe of the fourth main pipeline; 165. a fourth main pipeline second exhaust pipe ball valve;

17. a cooling water inlet pipe;

18. a cooling water outlet pipe;

19. a first exhaust line;

A. a control system; a. an air inlet; b. a nitrogen gas outlet; c. a reject gas vent; d. an oxygen-enriched air vent; g. a condensed water drain outlet; e. and f, a cooling water inlet and a cooling water outlet.

Detailed Description

In the description of the present utility model, it should be understood that the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", "a third" and "a fourth" may explicitly or implicitly include one or more such feature.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The utility model will be further described with reference to examples of embodiments shown in the drawings.

Examples

The embodiment provides a marine membrane separation nitrogen production system, which comprises a control system A, an air compression module, a separation module and a nitrogen storage module.

The air compression module comprises an air compressor 1 and an air buffer tank 2 connected to the rear end of the air compressor 1. Both the air compressor 1 and the air buffer tank 2 are commercially available, and the structure thereof is not particularly limited with reference to the prior art. The air compressor 1 is communicated with the air buffer tank 2 through a pipeline, and air can be introduced into the air buffer tank 2 after being compressed by the air compressor 1.

The separation module comprises a filter assembly, a heater 8 and a membrane assembly 9 which are communicated in sequence.

The filter component is connected to the rear end of the air buffer tank 2, and is specifically communicated with the air buffer tank 2 through a first main pipeline 11, an air inlet a of the first main pipeline 11 is communicated with the air buffer tank 2, and a first main pipeline pressure indicator 111 for detecting a pressure value of the first main pipeline 11, a first main pipeline temperature detector 112 for detecting a temperature of the first main pipeline 11 and a first main pipeline ball valve 113 capable of controlling on-off of the first main pipeline 11 are sequentially connected to the first main pipeline 11. The first main line pressure indicator 111 and the first main line temperature detector 112 are connected to the control system a, respectively.

Further, the filter assembly comprises a first filter 3, a freeze dryer 4, a second filter 5, a third filter 6 and a fourth filter 7 which are sequentially communicated, and preferably, the filter precision of the first filter 3 is more than or equal to the filter precision of the second filter 5 is more than or equal to the filter precision of the third filter 6 is more than or equal to the filter precision of the fourth filter 7. In the present utility model, a smaller filter accuracy value indicates a higher accuracy.

Specifically, the first filter 3 is a centrifugal oil-water separator, and the filtering precision of the first filter 3 is less than or equal to 3 μm. The second filter 5 is a main pipeline filter, and the filtering precision of the second filter 5 is less than or equal to 1 mu m. The third filter 6 is an activated carbon adsorption filter, and the filtering precision of the third filter 6 is less than or equal to 0.01 mu m. The fourth filter 7 is a micro oil filter, and the filtering precision of the fourth filter 7 is less than or equal to 0.01 mu m. In this embodiment, the filter accuracy of the first filter 3 is 3 μm, the filter accuracy of the second filter 5 is 1 μm, the filter accuracy of the third filter 6 is 0.01 μm, and the filter accuracy of the fourth filter 7 is 0.01 μm. The drain outlets of the first filter 3, the freeze dryer 4, the second filter 5, the third filter 6 and the fourth filter 7 are respectively communicated with the condensed water drain outlet g through pipelines for draining.

The heater 8 is communicated with the filtering component through a second main pipeline 12, a dew point meter 121 is connected to the second main pipeline 12 and used for detecting the dew point in the second main pipeline 12, the dew point meter 121 is connected to a control system A, and a dew point meter pressure reducing valve 122 and a dew point meter ball valve 123 are sequentially connected between the dew point meter 121 and the second main pipeline. The second main pipeline 12 can be communicated with the atmosphere, and when the dew point meter 121 detects that the dew point in the pipeline is smaller than or equal to a set value, the second main pipeline 12 is in a state of being disconnected from the atmosphere; when the dew point meter 121 detects that the dew point in the pipe is greater than the set value, the second main pipe 12 is in communication with the atmosphere, so that the second main pipe 12 is evacuated.

Further, a vent valve is provided on or at the rear end of the second main pipe 12. Specifically, the second main pipe 12 is provided with a second main pipe first ball valve 124 and a second main pipe pressure reducing valve 125, and the second main pipe first ball valve 124 and the second main pipe pressure reducing valve 125 are located at the front end of the dew point meter 121. When the dew point meter 121 detects that the dew point of the gas in the second main pipeline 12 is not qualified (is larger than a set value), the second main pipeline first ball valve 124 and the second main pipeline pressure reducing valve 125 are in an open state, and the gas is exhausted. A second main conduit second ball valve 126 is also provided on the second main conduit 12.

The heater 8 is commercially available, and the structure thereof is not particularly limited with reference to the prior art. A first temperature detecting device for detecting a temperature is connected to the heater 8. The first temperature detection device specifically includes a first heater temperature detector 81 and a second heater temperature detector 82. The first heater temperature detector 81 and the second heater temperature detector 82 are respectively connected with the control system A.

The membrane assembly 9 is communicated with the heater 8 through a third main pipeline 13, a third main pipeline pressure indicator 131, a third main pipeline temperature detector 132 and a third main pipeline second pneumatic valve 135 are sequentially arranged on the third main pipeline 13, a third main pipeline first pneumatic valve 134 and a third main pipeline ball valve 133 are further arranged on the third main pipeline, and the third main pipeline first pneumatic valve 134 and the third main pipeline ball valve 133 are located between the third main pipeline temperature detector 132 and the third main pipeline second pneumatic valve 135. The third main pipeline pressure indicator 131 and the third main pipeline temperature detector 132 are respectively connected to the control system A, and when the third temperature detector detects that the temperature is within a set range, the third main pipeline first pneumatic valve 134 is in a closed state, the third main pipeline second pneumatic valve 135 is in an open state, and ventilation is performed to the membrane component 9; when the third temperature detector detects that the temperature is not within the set range, the third main pipeline first pneumatic valve 134 is in an open state, the third main pipeline second pneumatic valve 135 is in a closed state, and the air is exhausted. In addition, when the temperature detected by the first heater temperature detector 81 and/or the second heater temperature detector 82 is within the unset range, the third main line second air valve 135 is also closed, thereby stopping the supply of air to the rear stage.

The permeate side of the membrane module 9 is in communication with the atmosphere via a first exhaust line 19, the end of the first exhaust line 19 being specifically connected to an oxygen-enriched vent d for oxygen-enriched venting to the open deck. The detention side of the membrane component 9 is connected with two pipelines, wherein one pipeline is a second exhaust pipeline which is communicated with the nitrogen storage module; the other pipeline is a third exhaust pipeline which can be communicated with the atmosphere, a first exhaust valve component and a second exhaust valve component for controlling the on-off of the first exhaust pipeline and the third exhaust pipeline are respectively arranged on the second exhaust pipeline and the third exhaust pipeline, a concentration detector 141 is connected between the detention side of the membrane component 9 and the two pipelines, the concentration detector 141 is connected to the control system A, when the concentration detector 141 detects that the nitrogen concentration at the detention side of the membrane component 9 is greater than or equal to a set value, the first exhaust valve component can be controlled to be opened so that the second exhaust pipeline is in a state communicated with the nitrogen storage module, and the second exhaust valve component can be controlled to be closed so that the third exhaust pipeline is in a state disconnected from the atmosphere; when the concentration detector 141 detects that the nitrogen concentration on the retention side of the membrane module 9 is less than the set value, the first exhaust valve assembly may be controlled to be closed so that the second exhaust pipe is in a state of being disconnected from the nitrogen storage module, and the second exhaust valve assembly may be controlled to be opened so that the third exhaust pipe is in a state of being in communication with the atmosphere.

Further, the membrane module 9 includes a plurality of membrane separators arranged in parallel. In this embodiment, the membrane module 9 includes two membrane separators arranged in parallel, and the air inlet end and the air outlet end of each membrane separator are respectively provided with a membrane separator ball valve. Preferably, the separation membrane used in the membrane module 9 is a hollow fiber membrane.

Further, the retention side of the membrane module 9 is connected to a fourth main pipeline 14, and the fourth main pipeline 14 is specifically two branch pipes, namely a fourth main pipeline first exhaust pipe 15 (i.e. a third exhaust pipeline) and a fourth main pipeline second exhaust pipe 16 (i.e. a second exhaust pipeline). The concentration detector 141 is disposed on the fourth main pipeline 14, and the concentration detector 141 is specifically an oxygen detector, and can reversely calculate the nitrogen concentration by detecting the oxygen concentration. The fourth pipeline further comprises a flowmeter 142, a fourth main pipeline stop valve 143 and a fourth main pipeline back pressure valve 144 which are sequentially arranged at the rear end of the concentration detector 141. The fourth main pipeline first exhaust pipe 15 is sequentially provided with a fourth main pipeline first exhaust pipe pneumatic valve 151 and a fourth main pipeline first exhaust pipe ball valve 152, and the tail end of the fourth main pipeline first exhaust pipe 15 is connected to the unqualified gas discharging port c. The fourth main pipeline second exhaust pipe 16 is provided with a fourth main pipeline second exhaust pipe first pressure indicator 161, a fourth main pipeline second exhaust pipe pneumatic valve 162, a fourth main pipeline second exhaust pipe ball valve 165, a fourth main pipeline second exhaust pipe check valve 163 and a fourth main pipeline second exhaust pipe second pressure indicator 164 in sequence. The nitrogen outlet b of the second exhaust pipe 16 of the fourth main pipeline is communicated with the nitrogen storage module and is used for passing high-purity qualified nitrogen to the nitrogen storage module.

The nitrogen storage module includes a nitrogen buffer tank 10, and the nitrogen buffer tank 10 is commercially available, and the structure thereof is not particularly limited with reference to the prior art. The nitrogen buffer tank 10 has a plurality of outlets, and in this embodiment, the nitrogen buffer tank 10 has two outlets, one of which is used to vent nitrogen to the nitrogen press and the other of which is used to vent gas to the point of use.

The air compressor 1, the filter assembly, the heater 8, the membrane assembly 9 and the above-mentioned valves may be controlled to be opened or closed by the control system a, respectively.

The marine membrane separation nitrogen making system also comprises a cooling water module (not shown), wherein the water outlet of the cooling water module is respectively communicated with the air compressor 1 and the cooling water inlet e of the freeze dryer 4 in the filtering assembly through a cooling water inlet pipe 17 and is used for introducing cooling water; the water inlet of the cooling water module is respectively communicated with the air compressor 1 and the cooling water outlet f of the freeze dryer 4 in the filter assembly through a cooling water outlet pipe 18 for leading out cooling water.

The membrane separation nitrogen production system for the ship has at least the following advantages:

(1) The marine membrane separation nitrogen production system is of a modular design, and has compact structure and small occupied area;

(2) The purity, flow and pressure of the nitrogen have high stability;

(3) The operation is simple, and qualified nitrogen can be obtained in a short time after the start-up;

(4) No moving parts, low failure rate, high operation reliability and low operation cost;

(5) The gas separation process is noiseless and pollution-free, and does not produce any harmful waste.

The above embodiments are provided to illustrate the technical concept and features of the present utility model and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same, and are not intended to limit the scope of the present utility model. All equivalent changes or modifications made in accordance with the spirit of the present utility model should be construed to be included in the scope of the present utility model.

Claims (10)

1. A marine membrane separation nitrogen making system is characterized in that: the marine membrane separation nitrogen production system comprises a control system, an air compression module, a separation module and a nitrogen storage module;

the air compression module comprises an air compressor and an air buffer tank connected to the rear end of the air compressor;

the separation module comprises a filter assembly, a heater and a membrane assembly which are sequentially communicated, the filter assembly is connected to the rear end of the air buffer tank, the permeation side of the membrane assembly is communicated with the atmosphere through a first exhaust pipeline, the detention side of the membrane assembly is connected with two pipelines, one pipeline is a second exhaust pipeline, and the second pipeline can be communicated with the nitrogen storage module; the other pipeline is a third exhaust pipeline which can be communicated with the atmosphere, the second exhaust pipeline and the third exhaust pipeline are respectively provided with a first exhaust valve component and a second exhaust valve component for controlling the on-off of the second exhaust pipeline and the third exhaust pipeline,

a concentration detector is connected between the detention side of the membrane component and the two pipelines, the concentration detector is connected with the control system, when the concentration detector detects that the nitrogen concentration of the detention side of the membrane component is greater than or equal to a set value, the first exhaust valve component can be controlled to be opened so that the second exhaust pipeline is in a state of being communicated with the nitrogen storage module, and the second exhaust valve component can be controlled to be closed so that the third exhaust pipeline is in a state of being disconnected from the atmosphere; when the concentration detector detects that the nitrogen concentration on the detention side of the membrane module is smaller than a set value, the first exhaust valve assembly can be controlled to be closed so that the second exhaust pipeline is in a state of being disconnected from the nitrogen storage module, and the second exhaust valve assembly can be controlled to be opened so that the third exhaust pipeline is in a state of being communicated with the atmosphere.

2. The marine membrane separation nitrogen making system according to claim 1, wherein: the filter assembly comprises a first filter, a freeze dryer, a second filter, a third filter and a fourth filter which are sequentially communicated, wherein the filtering precision of the first filter is more than or equal to that of the second filter, and the filtering precision of the third filter is more than or equal to that of the fourth filter.

3. The marine membrane separation nitrogen making system according to claim 2, wherein: the first filter is a centrifugal oil-water separator, and the filtering precision of the first filter is less than or equal to 3 mu m; and/or the number of the groups of groups,

the second filter is a main pipeline filter, and the filtering precision of the second filter is less than or equal to 1 mu m; and/or the number of the groups of groups,

the third filter is an activated carbon adsorption filter, and the filtering precision of the third filter is less than or equal to 0.01 mu m; and/or the number of the groups of groups,

the fourth filter is a micro-oil filter, and the filtering precision of the fourth filter is less than or equal to 0.01 mu m.

4. The marine membrane separation nitrogen making system according to claim 1, wherein: the marine membrane separation nitrogen production system further comprises a dew point meter arranged on a pipeline which is communicated with the filter assembly and the heater, the dew point meter is connected with the control system, the pipeline which is communicated with the filter assembly and the heater can be communicated with the atmosphere, and when the dew point meter detects that the dew point in the pipeline is smaller than or equal to a set value, the pipeline which is communicated with the filter assembly and the heater is in a state of being disconnected from the atmosphere; when the dew point in the dew point detection pipeline is larger than a set value, the pipeline which is communicated with the filter component and the heater is in a state of being communicated with the atmosphere, so that the pipeline which is communicated with the filter component and the heater is emptied.

5. The marine membrane separation nitrogen making system according to claim 4, wherein: an openable or closable vent valve is arranged on the pipeline or at the rear end of the pipeline for communicating the filter assembly with the heater.

6. The marine membrane separation nitrogen making system according to claim 1, wherein: the membrane assembly includes a plurality of membrane separators disposed in parallel.

7. The marine membrane separation nitrogen making system according to claim 6, wherein: the membrane component comprises two membrane separators which are arranged in parallel; and/or the number of the groups of groups,

the separation membrane used by the membrane component is a hollow fiber membrane.

8. The marine membrane separation nitrogen making system according to claim 1, wherein: the marine membrane separation nitrogen production system further comprises a first temperature detection device for detecting temperature, wherein the first temperature detection device is arranged on the heater and connected with the control system; and/or the number of the groups of groups,

the marine membrane separation nitrogen production system further comprises a second temperature detection device for detecting temperature, wherein the second temperature detection device is arranged on a pipeline at the inlet side of the membrane assembly and is connected with the control system, an air inlet valve and an air outlet valve are arranged on the pipeline between the second temperature detection device and the membrane assembly, and when the second temperature detection device detects that the temperature is greater than a set value, the air outlet valve is in an open state, and the air inlet valve is in a closed state; when the temperature detected by the second temperature detection device is smaller than or equal to a set value, the emptying valve is in a closed state, and the air inlet valve is in an open state.

9. The marine membrane separation nitrogen making system according to claim 1, wherein: the nitrogen storage module comprises a nitrogen buffer tank.

10. The marine membrane separation nitrogen making system according to claim 1, wherein: the marine membrane separation nitrogen making system further comprises a cooling water module, wherein a water outlet of the cooling water module is respectively communicated with a cooling water inlet of the air compressor and a cooling water inlet of the freeze dryer in the filter assembly through pipelines, and a water inlet of the cooling water module is respectively communicated with a cooling water outlet of the air compressor and a cooling water outlet of the freeze dryer in the filter assembly through pipelines.