Dual-fuel ship supporting membrane nitrogen generation device

Abstract

The present application provides a dual-fuel ship supporting membrane nitrogen production device, which relates to the technical field of nitrogen production. After the air compressor compresses the ambient air, it is initially filtered by the primary filter, and then cold-dried by the cold dryer. The compressed air after cold drying enters the multi-stage filtering mechanism through the air inlet of the skid-mounted nitrogen generator. The multi-stage filtering mechanism includes a precision filter, an oil removal filter and a dust filter connected in sequence, which are used for precision filtering, oil removal filtering and dust filtering. When the gas index detected by the pre-membrane detection instrument reaches the set value, the integrated control cabinet controls the pre-membrane air intake slow opening control valve to slowly open, and the filtered compressed gas is input to the polymer membrane for nitrogen and oxygen separation. The post-membrane detection instrument detects the gas index after nitrogen and oxygen separation, and the integrated control cabinet controls the gas regulating mechanism based on the gas index after nitrogen and oxygen separation to perform gas regulation to complete nitrogen production. In this way, the structural design and air side configuration of the membrane nitrogen production device can be optimized to adapt to the complex and harsh marine environment.

Description

Technical Field

[0001] The present application relates to the technical field of nitrogen production, and in particular to a membrane nitrogen production device for dual-fuel ships. Background Art

[0002] At present, new ships involving dual-fuel ship fuel systems for green energy transformation usually have dual-fuel main engines and their supporting FGSS (Fuel Gas Supply System) or methanol, ammonia fuel gas supply and gas control unit nitrogen purging, pipeline tightness testing and fuel tank inerting application requirements. In order to meet such requirements, a membrane nitrogen generator is required. The current more mature marine PSA (Pressure Swing Adsorption) nitrogen generation process is not suitable for current gas usage conditions due to its complex composition, frequent valve movements, low space utilization and excessive initial investment. The existing (and recently emerging) similar marine membrane nitrogen generation process still has defects.

[0003] At present, there are similar existing marine membrane nitrogen production technologies in the industry, including gas supply end and nitrogen production module; the gas supply end includes air compressor, air buffer tank, cold dryer, air filter connected in sequence and connected to the air inlet of nitrogen production module; nitrogen production module includes base, electrical box, control valve, flow meter, membrane, instrument sensor and connecting pipeline. It is mainly used in the common inert gas environment of ordinary ships. The relevant design indicators and parameters only meet the basic requirements of classification societies. Compared with the original use of inert gas for oil and chemical ships, although it also has modular and miniaturized design, due to the lack of much use experience, there are many inadequate considerations in the plan and it needs to be optimized.

[0004] In summary, the existing similar marine membrane nitrogen production technology is still based on the relatively single gas usage environment of old cargo hold inerting gas, and has not been specifically designed for the relevant requirements of dual-fuel system ships, and has a single function. The existing similar marine membrane nitrogen production technology has some defects in process configuration, is not easy to adapt to the complex and harsh marine environment, and is not reasonably configured on the air side. It does not consider the ambient air of the ship's engine room, which can easily lead to dirty blockage of the cold dryer evaporator. In addition, due to the regulations of the classification society, the existing technology usually configures an air buffer tank for pressure stabilization. The increase of the air buffer tank will lead to increased costs, so it is not economical. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a membrane nitrogen generator for a dual-fuel ship, so as to optimize the structural design of the membrane nitrogen generator and the configuration of the air side, adapt to the complex and harsh marine environment, and take into account the various gas usage environments of the dual-fuel ship fuel system.

[0006] In order to achieve the above purpose, the embodiments of the present application are implemented in the following manner:

[0007] In the first aspect, the embodiment of the present application provides a dual-fuel ship supporting membrane nitrogen making device, including: a compression cold drying mechanism and a skid-mounted nitrogen generator, the compression cold drying mechanism includes an air compressor, a primary filter and a cold dryer, and does not contain an air buffer tank, the air inlet and the air outlet of the primary filter are connected to the air compressor and the cold dryer respectively through external pipes, and the air outlet of the cold dryer is connected to the air inlet of the skid-mounted nitrogen generator through an external pipe, wherein the air compressor compresses the ambient air and then performs preliminary filtration through the primary filter, and the cold dryer performs cold drying treatment; the skid-mounted nitrogen generator includes a multi-stage filtration mechanism, a pre-membrane detection instrument, a pre-membrane air intake slow-opening control valve, a polymer membrane, a post-membrane detection instrument, and a gas regulating mechanism , integrated control cabinet, the compressed air after cold drying treatment enters the multi-stage filtering mechanism through the air inlet of the skid-mounted nitrogen generator, the multi-stage filtering mechanism includes a precision filter, an oil removal filter and a dust filter connected in sequence, which are used for precision filtration, oil removal filtration and dust filtration. When the gas index detected by the pre-membrane detection instrument reaches the set value, the integrated control cabinet controls the pre-membrane air intake slow-opening control valve to open slowly, and inputs the compressed gas filtered by the multi-stage filtering mechanism into the polymer membrane for nitrogen and oxygen separation. The post-membrane detection instrument is used to detect the gas index after nitrogen and oxygen separation. The integrated control cabinet controls the gas regulating mechanism to perform gas regulation based on the gas index after nitrogen and oxygen separation to complete nitrogen production.

[0008] In combination with the first aspect, in a first possible implementation of the first aspect, the compression and drying mechanism also includes an automatic condensate discharge valve, which is arranged at the condensate discharge port of the primary filter and is used to automatically discharge the condensate generated during the preliminary filtration of the compressed air.

[0009] In combination with the first aspect, in a second possible implementation of the first aspect, a soft connection design is adopted at key points, wherein the key points include the connection between components and pipelines, and the connection between pipelines.

[0010] In combination with the second possible implementation method of the first aspect, in a third possible implementation method of the first aspect, when the key point is the connection between the component and the pipeline, the component is provided with an installation area at this key point, a shock-absorbing gasket is provided on the installation area, screw holes are provided on both sides of the installation area, and the soft connection is designed as follows: the pipeline fixing clamp with the shock-absorbing gasket is installed in cooperation with the screw holes on both sides of the installation area of ​​the component, so that the pipeline is enclosed between the component and the pipeline fixing clamp to achieve a soft connection between the component and the pipeline, wherein the pipeline fixing clamp with the shock-absorbing gasket includes a U-shaped gasket area and connection areas on both sides of the U-shaped gasket area, each connection area is provided with screw holes corresponding to the screw holes on both sides of the installation area, and the U-shaped gasket area is provided with a shock-absorbing gasket.

[0011] In combination with the second possible implementation method of the first aspect, in a fourth possible implementation method of the first aspect, when the key point is the connection between pipes, there is a flange at the interface of the two pipes to be connected, and the soft connection is designed as follows: the rubber joint with the center channel is respectively connected to the flanges at the interface of the two pipes, the rubber joint with the center channel is in the shape of a spool, and a channel is opened at the axis, and the connecting plates at both ends are provided with through holes corresponding to the through holes on the flanges, and the flanges and the connecting plates are connected by bolts to achieve a soft connection between the pipes.

[0012] In combination with the first aspect, in a fifth possible implementation of the first aspect, the dual-fuel ship supporting membrane nitrogen production device also includes a pre-processing mechanism, which includes a bellows, a flaring tube, a first cylinder, a connecting strip, a mounting frame, a transmission rod, a first servo motor, a connecting block, a frame connecting rod, a grille, a transverse screw, a first sliding platform, a second sliding platform, an air blowing mechanism, and a spraying mechanism. The air inlet of the air compressor is connected to one end of the bellows, and the flaring tube is fixedly installed on the other end of the bellows. The first cylinder is fixedly installed on the top of the air compressor, and the connecting strip is fixedly installed on the output shaft of the first cylinder. The bottom end of the connecting strip is fixedly connected to the flaring tube. The mounting frame is fixedly installed on a side of the air compressor away from the cold dryer, and the transmission rod is rotatably installed on a side of the mounting frame away from the cold dryer. The first servo motor is fixedly installed in the mounting frame. The output shaft of the service motor is connected to one end of the transmission rod, and the connecting block is installed at the end of the transmission rod away from the air compressor. The top and bottom of the connecting block are fixedly installed with mounting blocks, and the two mounting blocks are provided with embedding grooves on the sides away from each other, and connecting heads are fixedly installed in the two embedding grooves by bolts. The two frame connecting rods are respectively fixedly installed on the sides away from each other of the two connecting heads, and the two grilles are respectively fixedly installed on the ends of the two frame connecting rods away from each other. The grille located above is in contact with the flared pipe, and a first concave seat is provided under the grille located below, and a transverse screw is rotatably installed in the first concave seat, and a first sliding platform and a second sliding platform are threadedly installed on the transverse screw, an air blowing mechanism is provided on the first sliding platform, and a spray mechanism is provided on the second sliding platform, and the spray mechanism and the air blowing mechanism are used to clean and dry the grilles after use.

[0013] In combination with the fifth possible implementation of the first aspect, in a sixth possible implementation of the first aspect, the air blowing mechanism includes a second concave seat, a first bidirectional screw is rotatably installed in the second concave seat, a first linkage plate and a second linkage plate are threadedly installed on the first bidirectional screw, a first clamping cover is fixedly installed on a side of the first linkage plate close to the second linkage plate, a second clamping cover is fixedly installed on a side of the second linkage plate close to the first linkage plate, the first clamping cover and the second clamping cover are adapted to each other, and the grille located below is between the two, the bottom of the second clamping cover is set to be an opening, a ventilation head is fixedly installed on a side of the first clamping cover away from the second clamping cover, one end of the ventilation head extends into the first clamping cover and is fixedly installed with a first hollow circular plate, a plurality of air nozzles are fixedly installed on a side of the first hollow circular plate close to the second clamping cover, one end of a ventilation hose is fixedly installed on the air outlet port of the air compressor, the other end of the ventilation hose is fixedly connected to the ventilation head, and an air valve is provided on the ventilation hose.

[0014] In combination with the sixth possible implementation of the first aspect, in a seventh possible implementation of the first aspect, a scraper strip is provided in the second clamping cover, a side of the second clamping cover away from the first clamping cover is provided with a circular frame, a side of the circular frame close to the second clamping cover is rotatably installed with a linkage shaft, one end of the linkage shaft extends into the second clamping cover and is fixedly connected to the scraper strip, and the linkage shaft is slidably connected to the second clamping cover, a second cylinder is fixedly installed on an outer wall of one side of the second clamping cover, a supporting block is fixedly installed on the output shaft of the second cylinder, the bottom of the supporting block is fixedly connected to the circular frame, a second servo motor is fixedly installed in the circular frame, and the output shaft of the second servo motor is fixedly connected to one end of the linkage shaft.

[0015] In combination with the sixth possible implementation manner of the first aspect, in an eighth possible implementation manner of the first aspect, the spray mechanism includes a third concave seat, a second bidirectional screw is rotatably installed in the third concave seat, a third linkage plate and a fourth linkage plate are threadedly installed on the second bidirectional screw, a third clamping cover is fixedly installed on a side of the third linkage plate close to the fourth linkage plate, a fourth clamping cover is fixedly installed on a side of the fourth linkage plate close to the third linkage plate, a water pump is fixedly installed on a side of the third linkage plate away from the fourth linkage plate, one end of a water pipe is fixedly installed on the water outlet port of the water pump, the other end of the water pipe extends into the third clamping cover and is fixedly installed with a second hollow circular plate, a plurality of water spray heads are fixedly installed on a side of the second hollow circular plate close to the fourth clamping cover, a fan is fixedly installed on a side of the fourth linkage plate away from the third linkage plate, one end of an air supply pipe is fixedly installed on the air outlet port of the fan, and the other end of the air supply pipe extends into the fourth clamping cover and is fixedly installed with an air outlet nozzle.

[0016] In combination with the eighth possible implementation manner of the first aspect, in a ninth possible implementation manner of the first aspect, a first reduction motor is fixedly installed on one side of the first concave seat, and an output shaft of the first reduction motor is fixedly connected to one end of the transverse screw; a second reduction motor is fixedly installed on an outer wall of one side of the second concave seat, and an output shaft of the second reduction motor is fixedly connected to one end of the first bidirectional screw; a third reduction motor is fixedly installed on an outer wall of one side of the third concave seat, and an output shaft of the third reduction motor is fixedly connected to one end of the second bidirectional screw; arc-shaped avoidance grooves are provided on the tops of the first clamping cover, the second clamping cover, the third clamping cover and the fourth clamping cover, and the arc-shaped avoidance grooves are adapted to the frame connecting rod; a support platform is fixedly installed on one side of the second linkage plate close to the first linkage plate, a placement groove is provided on the top of the support platform, a debris box is provided in the placement groove, and the debris box is located below the second clamping cover; sewage outlets are provided at the bottoms of the third clamping cover and the fourth clamping cover; a water diversion bucket is fixedly installed in the third concave seat, and the water diversion bucket is located below the third clamping cover and the fourth clamping cover.

[0017] Beneficial effects: 1. In this scheme, the membrane nitrogen making device supporting dual-fuel ships includes a compression and cold drying mechanism and a skid-mounted nitrogen making machine. The compression and cold drying mechanism includes an air compressor (a screw air compressor is used, and the compressed air is used as compressed air after relatively stable compression by the rotor, and the pressure fluctuation is very small), a primary filter and a cold dryer, but does not contain an air buffer tank (by providing an air control scheme, the pressure is increased in the compression, primary filtration and cold drying sections, and the integrated control cabinet is used to control the slow opening control valve of the air intake in front of the membrane to open slowly, and the air buffer tank is optimized. After the relevant instruments in front of the polymer membrane are tested and qualified, the slow opening control valve of the air intake in front of the membrane will gradually open, and the clean raw gas will gradually enter the membrane and gradually increase the pressure to prevent the instantaneous pressure difference from being too large to damage the polymer membrane), the air inlet and outlet of the primary filter are connected to the air compressor and the cold dryer respectively through external pipes, and the air outlet of the cold dryer is connected to the air inlet of the skid-mounted nitrogen making machine through an external pipe. The air compressor compresses the ambient air and then performs preliminary filtration through the primary filter, and the cold dryer performs cold drying treatment. By deploying a primary filter in front of the cold dryer to remove large particles of solid impurities, large volumes of oil and liquid condensate, while preliminarily purifying the air source, it can also reduce the burden on the cold dryer and reduce the problem of poor-quality air source directly entering the cold dryer under severe sea conditions, causing the cold dryer evaporator to become dirty and blocked, effectively increasing the reliability and service life of the device. The skid-mounted nitrogen generator includes a multi-stage filtration mechanism, a pre-membrane detection instrument, a pre-membrane air intake slow-opening control valve, a polymer membrane, a post-membrane detection instrument, a gas regulating mechanism, and an integrated control cabinet. The compressed air after cold drying enters the multi-stage filtration mechanism through the air inlet of the skid-mounted nitrogen generator. The multi-stage filtration mechanism includes a precision filter, an oil removal filter, and a dust filter connected in sequence, which are used for precision filtration, oil removal filtration, and dust filtration. When the gas index detected by the pre-membrane detection instrument reaches the set value, the integrated control cabinet controls the pre-membrane air intake slow-opening control valve to open slowly, and the compressed gas filtered by the multi-stage filtration mechanism is input into the polymer membrane for nitrogen and oxygen separation. The post-membrane detection instrument is used to detect the gas index after nitrogen and oxygen separation. The integrated control cabinet controls the gas regulating mechanism based on the gas index after nitrogen and oxygen separation to perform gas regulation and complete nitrogen production. Since ship cabins are usually very expensive and require extremely high space utilization, the supporting equipment on board needs to meet the harsh environments such as high temperature difference, high vibration, and high corrosion that ships usually face. Therefore, the device is skid-mounted as much as possible after meeting the maintenance space as much as possible, forming a skid-mounted nitrogen generator. This solution adopts primary filtration-cold drying (compared with the traditional heating drying solution, it can more effectively remove the gaseous water content in the compressed air)-multi-stage filtration solution to remove particles, moisture, oil droplets, dust, etc. in the compressed air, reduce the dew point of the raw gas to a pressure dew point of 3-5°C, improve the quality of the raw gas, and reduce the workload of the polymer membrane (especially liquid water, the polymer membrane will be almost scrapped when encountering liquid water).The gas separated by the polymer membrane will then pass through the instrument behind the membrane to determine the purity, dew point, temperature and other indicators of the nitrogen. Before the performance indicators are met, it will be vented to the atmosphere through the vent valve. After the comprehensive performance is qualified, qualified product nitrogen will be provided to the downstream back end. The integrated control cabinet and various detection instruments, valves, etc. can realize a highly automated nitrogen production process.

[0018] 2. In this solution, a soft connection design is adopted at key points, including the connection between components and pipes, and the connection between pipes. When the key point is the connection between a component and a pipe, the component is provided with an installation area at this key point, and a shock-absorbing gasket is provided on the installation area. Screw holes are provided on both sides of the installation area. The soft connection design is: the pipe fixing clamp with a shock-absorbing gasket is installed in coordination with the screw holes on both sides of the installation area of ​​the component, and the pipe is enclosed between the component and the pipe fixing clamp to achieve a soft connection between the component and the pipe. The pipe fixing clamp with a shock-absorbing gasket includes a U-shaped gasket area and connection areas on both sides of the U-shaped gasket area. Each connection area is provided with screw holes corresponding to the screw holes on both sides of the installation area, and the U-shaped gasket area is provided with a shock-absorbing gasket. When the key point is the connection between pipelines, there is a flange at the interface of the two pipelines to be connected. The soft connection is designed as follows: the rubber joint with the central channel is connected to the flanges at the interface of the two pipelines respectively. The rubber joint with the central channel is in the shape of a spool, and a channel is opened at the axis. The connecting plates at both ends are provided with through holes corresponding to the through holes on the flanges. The flanges and connecting plates are connected by bolts to achieve the soft connection between the pipelines. Different soft connection structures and soft connection schemes are designed for different key points, which can achieve vibration adjustment: when the medium in the pipeline flows, the medium will vibrate. The soft connection at the key point will absorb the vibration through its internal relaxation structure, avoiding the pipeline from vibrating significantly when the medium flows. Expansion compensation: In normal use, the pipeline will expand or displace due to factors such as temperature and vibration, causing deformation and stress concentration of the pipeline. The soft connection at the key point can play a buffering role in the deformation of the pipeline through its expansion and contraction properties, so as to protect the safety of the pipeline and extend the service life of the pipeline. Noise reduction: Since industrial pipelines generate a lot of noise when working, the soft joints at key points have good sound absorption, thereby reducing the noise and providing good protection for the working environment. The appropriate use of soft joints can effectively avoid damage to pipelines and equipment, while reducing noise and improving system stability.

[0019] 3. The pre-processing mechanism designed in front of the air compressor can perform pre-filtration before compressing the ambient air, which can reduce the continuous direct entry of inferior air sources into compression and cold drying in severe sea conditions, improve the purity of the air, and effectively increase the reliability and service life of the entire system. The specific design of the pre-processing mechanism is also a relatively small and easy-to-maintain design architecture.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the front structure of a membrane nitrogen generator for a dual-fuel ship provided in an embodiment of the present application.

[0023] Figure 2 This is a schematic diagram of the internal structure of the skid-mounted nitrogen generator.

[0024] Figure 3 This is the PID control diagram for the air purification side.

[0025] Figure 4 This is the PID control diagram for nitrogen production.

[0026] Figure 5 This is a top view of the skid-mounted nitrogen generator.

[0027] Figure 6 This is an enlarged view of part A of the skid-mounted nitrogen generator.

[0028] Figure 7 The diagram is a schematic diagram of the soft connection structure when the key point is the connection between the component and the pipeline.

[0029] Figure 8 The diagram is a schematic diagram of the soft connection structure when the key point is the connection between pipelines.

[0030] Fig. 9 This is a schematic diagram of the structure from the first perspective of deploying the pre-processing mechanism in front of the air compressor.

[0031] Fig.10 This is a structural diagram from a second perspective of deploying a pre-processing mechanism in front of an air compressor.

[0032] Fig.11 This is the main view of the pre-processing mechanism deployed in front of the air compressor.

[0033] Fig.12 It is a schematic diagram of the connection structure of the flared tube and the connecting strip in the pre-processing mechanism.

[0034] Fig.13 This is a schematic diagram of the disassembled state of the installation base block and the connector in the pre-processing mechanism.

[0035] Fig.14 It is a schematic diagram of the connection structure of the first concave seat, the second concave seat and the third concave seat in the pre-processing mechanism.

[0036] Fig.15 It is a schematic diagram of the installation structure of the transverse screw in the pre-processing mechanism.

[0037] Fig.16 It is a schematic diagram of the assembly of the first clamping cover and the second clamping cover in the pre-processing mechanism.

[0038] Fig.17 It is a schematic diagram of the cross-sectional structure of the first clamping cover and the second clamping cover in the pre-processing mechanism.

[0039] Fig.18 It is a schematic diagram of the assembly of the third clamping cover and the fourth clamping cover in the pre-processing mechanism.

[0040] Fig.19 It is a schematic diagram of the cross-sectional structure of the third clamping cover and the fourth clamping cover in the pre-processing mechanism.

[0041] Icons: 100-Membrane nitrogen generator for dual-fuel ships; 110-Compression and drying mechanism; 111-Air compressor; 112-Primary filter; 113-Dryer; 114-Automatic condensate release valve; 120-Skid-mounted nitrogen generator; 121-Multi-stage filtration mechanism; 1211-Precision filter; 1212-Oil removal filter; 1213-Dust filter; 122-Pre-membrane detection instrument; 123-Pre-membrane air intake slow-opening control valve; 124-Polymer membrane; 125-Post-membrane detection instrument; 126-Gas regulating mechanism; 1261-Automatic dynamic regulating valve; 1262-product gas program control valve; 1263-instrument gas pressure reduction and filter system; 127-online real-time oxygen analyzer; 128-nitrogen flowmeter; 129-integrated control cabinet; 131-pipe fixing clamp; 1311-U-type gasket area; 1312-connection area; 132-rubber joint; 133-shock-absorbing gasket; 140-pre-processing mechanism; 1401-corrugated pipe; 1402-expanding pipe; 1403-first cylinder; 1404-connection strip; 1405-mounting frame; 1406-driving rod; 14 07-connection block; 1408-mounting base block; 1409-embedded groove; 1410-connector; 1411-bracket rod; 1412-grid; 1413-first concave seat; 1414-transverse screw; 1415-first sliding platform; 1416-second concave seat; 1417-first bidirectional screw; 1418-first linkage plate; 1419-second linkage plate; 1420-first clamping cover; 1421-second clamping cover; 1422-ventilation head; 1423-first hollow circular plate; 1424-jet nozzle; 1425-ventilation soft Tube; 1426-scraper strip; 1427-reciprocating frame; 1428-linkage shaft; 1429-second cylinder; 1430-support block; 1431-second sliding platform; 1432-third concave seat; 1433-second bidirectional lead screw; 1434-third linkage plate; 1435-fourth linkage plate; 1436-third clamping cover; 1437-fourth clamping cover; 1438-water pump; 1439-water pipe; 1440-second hollow circular plate; 1441-sprinkler head; 1442-fan; 1443-air supply pipe; 1444-air outlet nozzle. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0043] See also Figure 1 , Figure 1 The front structural diagram of the dual-fuel ship supporting membrane nitrogen generator 100 provided in the embodiment of the present application. In this embodiment, the dual-fuel ship supporting membrane nitrogen generator 100 includes a compression cold drying mechanism 110 and a skid-mounted nitrogen generator 120.

[0044] In this embodiment, the compression and cold drying mechanism 110 includes an air compressor 111, a primary filter 112 and a cold dryer 113, but does not include an air buffer tank. The air inlet and air outlet of the primary filter 112 are respectively connected to the air compressor 111 and the cold dryer 113 through external pipes, and the air outlet of the cold dryer 113 is connected to the air inlet of the skid-mounted nitrogen generator 120 through an external pipe, wherein the air compressor 111 compresses the ambient air and then performs preliminary filtration through the primary filter 112, and then performs cold drying treatment by the cold dryer 113. The compression and cold drying mechanism 110 also includes an automatic condensate discharge valve 114, which is arranged at the condensate discharge port of the primary filter 112, and is used to automatically discharge the condensate in the process of preliminary filtration of the compressed air (which can be controlled by the integrated control cabinet 129).

[0045] The air compressor 111 uses a screw air compressor 111, which is used as compressed air after relatively stable compression by the rotor, and the pressure fluctuation is very small. By deploying a primary filter 112 in front of the cold dryer 113, large solid impurities and large volumes of oil and liquid condensate are removed. While preliminarily purifying the air source, the burden of the cold dryer 113 can be reduced, and the problem of poor quality air source directly entering the cold dryer 113 under severe sea conditions, which causes the evaporator of the cold dryer 113 to be dirty and blocked, is reduced, and the reliability and service life of the device are effectively increased.

[0046] like Figure 2 As shown, the skid-mounted nitrogen generator 120 includes a multi-stage filtering mechanism 121, a pre-membrane detection instrument 122, a pre-membrane air intake slow-opening control valve 123, a polymer membrane 124, a post-membrane detection instrument 125, a gas regulating mechanism 126, an integrated control cabinet 129, etc.

[0047] The compressed air after cold drying enters the multi-stage filtering mechanism 121 through the air inlet of the skid-mounted nitrogen generator 120. The multi-stage filtering mechanism 121 includes a precision filter 1211, an oil removal filter 1212 and a dust filter 1213 which are connected in sequence (revealing the order in which the compressed gas passes through these components in sequence) and are used for precision filtration, oil removal filtration and dust filtration to obtain purer compressed air as raw gas.

[0048] When the gas index (such as air pressure, gas composition, temperature, etc.) detected by the pre-membrane detection instrument 122 reaches the set value, the integrated control cabinet 129 controls the pre-membrane air intake slow-opening control valve 123 to slowly open, and the compressed gas (i.e., the raw gas for nitrogen and oxygen separation) filtered by the multi-stage filtering mechanism 121 is input to the polymer membrane 124 for nitrogen and oxygen separation. The post-membrane detection instrument 125 is used to detect the gas index (such as nitrogen purity and dew point, temperature, etc.) after nitrogen and oxygen separation, and there are also online real-time oxygen analyzers 127 and nitrogen flow meters 128, etc., in order to obtain real-time parameters of the gas, and the integrated control cabinet 129 controls the gas regulating mechanism 126 to regulate the gas based on the gas index after nitrogen and oxygen separation to complete nitrogen production. The gas regulating mechanism 126 includes an automatic regulating valve 1261 (with three regulating functions of purity, flow and pressure), a product gas program control valve 1262 and an instrument gas pressure reducing and filter system 1263, etc., which can realize stepless regulation, detect whether the nitrogen is qualified or not, and control the processing of qualified nitrogen and unqualified nitrogen (for example, unqualified nitrogen is discharged into the atmosphere, and qualified nitrogen is supplied to the corresponding gas usage scenarios).

[0049] For nitrogen that meets the standards, the integrated control cabinet 129 can input it into the corresponding gas usage environment, and for nitrogen that does not meet the standards, it can be vented to the atmosphere through a vent valve. After the comprehensive performance of the nitrogen is qualified, qualified product nitrogen can be provided to the gas usage environment at the downstream back end.

[0050] Usually, the nitrogen generator is placed in a separate nitrogen room. It is required that after the automatic startup and standby, it can basically meet the requirements of no actual on-site operation by personnel, and simple alarms and other operations that do not require on-site on-duty operation are eliminated. The equipment is required to meet the high automation control requirements of remote control, monitoring and even emergency alarm processing. Therefore, the dual-fuel ship supporting membrane nitrogen generator 100 in this embodiment can realize automatic control of the entire nitrogen production process, such as Figure 3 and Figure 4 As shown, Figure 3 This is the PID control diagram for the air purification side. Figure 4 This is the PID control diagram for nitrogen production.

[0051] Since ship cabins are usually very expensive and require extremely high space utilization, the supporting equipment on board needs to meet the harsh environments such as high temperature difference, high vibration, and high corrosion that ships usually face. Therefore, the device is as integrated as possible after meeting the maintenance space as much as possible to form a skid-mounted nitrogen generator 120. This solution adopts the primary filtration-cold drying-multi-stage filtration solution to remove particles, moisture, oil droplets, dust, etc. in the compressed air, reduce the dew point of the raw gas to the pressure dew point of 3-5℃, improve the quality of the raw gas, and reduce the workload of the polymer membrane 124 (especially liquid water, the polymer membrane 124 is almost scrapped when it encounters liquid water). The gas separated by the polymer membrane 124 passes through the instrument after the membrane to determine the purity, dew point, temperature and other indicators of the nitrogen. Before the performance indicators are not met, it will be vented to the atmosphere through the vent valve, and after the comprehensive performance is qualified, it will provide qualified product nitrogen to the downstream back end. The integrated control cabinet 129 cooperates with various detection instruments, valves, etc. to realize a highly automated nitrogen production process. The polymer membrane 124 uses a low-temperature applicable polymer membrane 124, so it can be cold-dried using a cold dryer 113 (different from traditional membrane components, traditional membrane components need to be equipped with a heating part to heat the raw gas in front of the membrane, so as to increase the temperature to increase the content of gaseous water that can be contained in the compressed gas, maintain a high temperature to reduce the liquefaction of gaseous water, and avoid liquid water damaging the membrane components. Corresponding to this characteristic, traditional membrane components are generally suitable for relatively high-temperature gas separation). The gaseous water content in the compressed gas is reduced by lowering the temperature, so that it is liquefied and condensed water is discharged, thereby achieving cold drying (compared with traditional heating and drying schemes, it can more effectively remove the gaseous water content in compressed air), reducing the probability of the polymer membrane 124 being damaged by liquid water in the compressed gas. Furthermore, the dual-fuel ship supporting membrane nitrogen production device 100 in this embodiment does not contain an air buffer tank. By providing an air control scheme, the pressure is increased in the compression, primary filtration and cold drying stages, and the integrated control cabinet 129 is used to control the slow opening control valve 123 of the air inlet in front of the membrane to be slowly opened. After the relevant instruments in front of the polymer membrane 124 are tested and qualified, the slow opening control valve 123 of the air inlet in front of the membrane will gradually open, and the clean raw gas will gradually enter the membrane element and gradually increase the pressure to prevent the instantaneous pressure difference from being too large to damage the polymer membrane 124. In this way, the air buffer tank can be optimized, and the cost can be saved while ensuring reliability.

[0052] Due to the particularity of the ship's operating environment, it will cross longitude and latitude in the ocean in a short time, resulting in a huge change in the application environment of ship equipment in a short period of time, so marine equipment needs to be able to adapt to such changing environmental conditions. In possible extreme environments, the equipment must be able to maintain reliable operation of the device, which requires the reliability and performance indicators of equipment components to meet higher requirements and tests. The dual-fuel ship supporting membrane nitrogen production device 100 of this embodiment can adapt to the stepless adjustment of different purities, flow rates, and pressures as required, and has a wider range of applicability.

[0053] In addition, considering the particularity of the ship's operating environment, vibration has a greater impact on the pipeline system, especially at the pipeline fixing points (the connection and fixing between the pipeline and the parts) and the pipeline connection points (the connection between the pipeline and the pipeline), which are the areas where resonance is most likely to occur. Through experiments and vibration analysis, the inventors of this application have determined the points in the pipeline system where resonance is most likely to occur. At these points, corresponding soft connection schemes are designed to absorb and reduce vibration transmission through built-in shock-absorbing gaskets 133, thereby protecting the pipeline connection points from damage. The shock-absorbing gasket 133 is made of a polymer material with high elasticity, aging resistance, and high temperature adaptability to ensure that a good shock-absorbing effect can be maintained under different environmental conditions. In pipelines where there may be impact pressure fluctuations, such as discharge pipelines, soft connection designs are also used to adapt to the vibration and shaking of the ship.

[0054] like Figure 5 and Figure 6 As shown, Figure 5 A top view of the skid-mounted nitrogen generator 120 ( Figure 5 The schematic diagram of the connection between the skid-mounted nitrogen generator 120 and other components is also provided. Figure 2 The schematic diagram of the internal structure of the skid-mounted nitrogen generator 120 in FIG. 1 shows more connection relationships between the components). Figure 6 This is an enlarged view of part A in the skid-mounted nitrogen generator 120. In this embodiment, the key points are divided into: the connection between any component and the pipeline (recorded as key point 1), and the connection between pipelines (recorded as key point 2). Only these parts are marked in the figure, but there are far more key points than these two. At these key points, this embodiment designs corresponding soft connection structures to achieve soft connection to adapt to vibration, shock absorption and absorb impact energy.

[0055] When the key point is the connection between the component and the pipe (i.e. key point 1), Figure 7As shown, the component has an installation area at this key point, a shock absorbing gasket 133 is arranged on the installation area, screw holes are arranged on both sides of the installation area, and the soft connection design is: the pipe fixing clamp 131 with the shock absorbing gasket 133 is installed in cooperation with the screw holes on both sides of the installation area of ​​the component, and the pipe is enclosed between the component and the pipe fixing clamp 131 to achieve a soft connection between the component and the pipe. The pipe fixing clamp 131 with the shock absorbing gasket 133 includes a U-shaped gasket area 1311 and connection areas 1312 located on both sides of the U-shaped gasket area 1311, each connection area 1312 has screw holes corresponding to the screw holes on both sides of the installation area, and the U-shaped gasket area 1311 is provided with a shock absorbing gasket 133. Of course, the U-shaped gasket area 1311 can be an integral shock-absorbing gasket 133 (that is, the entire U-shaped gasket area 1311 is a shock-absorbing gasket 133), or it can be other types, such as laying a shock-absorbing gasket 133 in a U-shaped gasket area 1311 of other materials.

[0056] When the key point is the connection between pipelines (i.e. key point 2), there is a flange at each interface of the two pipelines to be connected. Figure 8 As shown, the corresponding flexible connection is designed as follows: the rubber joint 132 with a central channel is connected to the flanges at the interfaces of the two pipes respectively. The rubber joint 132 with a central channel is in the shape of a spool, and a channel is opened at the axis. The connecting plates at both ends are provided with through holes corresponding to the through holes on the flanges. The flanges and the connecting plates are connected by bolts to achieve a flexible connection between the pipes.

[0057] At these key points, corresponding soft connection designs are adopted. The soft connection design at key point 1 not only fixes the pipeline, but also absorbs and reduces vibration transmission through the built-in shock-absorbing gasket 133, thereby protecting the pipeline connection point from damage. The soft connection design at key point 1 can absorb impact energy during pressure fluctuations and reduce the impact on the pipeline system. These soft connection designs also take into account corrosion resistance and temperature resistance to adapt to various challenges in the ship environment. In addition, the structural design of the soft connections at key points 1 and 2 allows a certain degree of axial, lateral and angular displacement, which enables the pipeline system to flexibly adapt to the movement of the ship without causing stress concentration at the connection.

[0058] Different soft connection structures and soft connection solutions are designed for different key points to achieve vibration regulation: when the medium in the pipeline flows, the medium will vibrate. The soft connection at the key points will absorb the vibration through its internal relaxation structure, avoiding obvious vibration of the pipeline when the medium flows. Expansion compensation: in normal use, the pipeline will expand or displace due to factors such as temperature and vibration, causing deformation and stress concentration of the pipeline. The soft connection at the key points can play a buffering role in the deformation of the pipeline through its expansion and contraction properties, so as to achieve the purpose of protecting the safety of the pipeline and extending the service life of the pipeline. Noise reduction: since industrial pipelines generate a lot of noise when working, the soft connection at the key points has a good sound absorption effect, thereby reducing the generation of noise and having a good protective effect on the working environment. The appropriate use of soft connections can effectively avoid damage to pipelines and equipment, while reducing noise and improving the stability of the system.

[0059] When nitrogen production is required, start the air compressor 111 first. The air compressor 111 draws air from the cabin, and the compressed air enters the primary filter 112 to remove larger solid particles and large volumes of oil and water droplets. Then, the air filtered by the primary filter 112 enters the cold dryer 113. The cold dryer 113 removes most of the condensed water, oil droplets and solid impurities in the air. Then, the air discharged from the cold dryer 113 enters the precision filter 1211, first undergoes precision filtration, and then enters the oil removal filter 1212 to remove the oil droplets, and then enters the dust filter 1213 to further filter the dust. At this time, relatively pure air is obtained and is input into the skid-mounted nitrogen generator 120 as raw gas for nitrogen production.

[0060] In order to further improve the quality of the air source, a pre-processing mechanism 140 may be arranged before the air compressor 111. Figure 9-19 As shown, the pre-processing mechanism 140 may include a bellows 1401, a flared tube 1402, a first cylinder 1403, a connecting strip 1404, a mounting frame 1405, a transmission rod 1406, a first servo motor, a connecting block 1407, a connecting rod 1411, a grille 1412, a transverse screw 1414, a first sliding platform 1415, a second sliding platform 1431, an air blowing mechanism, and a spraying mechanism.

[0061] The air inlet of the air compressor 111 is connected to one end of the bellows 1401, and the other end of the bellows 1401 is fixedly installed with the flared tube 1402. The first cylinder 1403 is fixedly installed on the top of the air compressor 111. The connecting strip 1404 is fixedly installed on the output shaft of the first cylinder 1403. The bottom end of the connecting strip 1404 is fixedly connected to the flared tube 1402. The mounting frame 1405 is fixedly installed on the side of the air compressor 111 away from the cold dryer 113. The transmission rod 1406 is rotatably installed on the side of the mounting frame 1405 away from the cold dryer 113. The first servo motor is fixedly installed in the mounting frame 1405. The output shaft of the servo motor is connected to one end of the transmission rod 1406, and the connecting block 1407 is installed at the end of the transmission rod 1406 away from the air compressor 111. The top and bottom of the connecting block 1407 are fixedly installed with mounting blocks 1408. The two mounting blocks 1408 are provided with embedding grooves 1409 on the sides away from each other. Connecting heads 1410 are fixedly installed in the two embedding grooves 1409 by bolts. Two connecting rods 1411 are respectively fixedly installed on the sides away from each other of the two connecting heads 1410, and two grilles 1412 are respectively fixedly installed on the ends of the two connecting rods 1411 away from each other. In the initial state, the grille 1412 located at the top is in contact with the flared tube 1402. The flared tube 1402 and the grille 1412 can be separated and contacted by the extension and contraction of the output shaft of the first cylinder 1403, so that the grille 1412 can be rotated conveniently, and the connector 1410 is installed in the embedding groove 1409 by bolt installation, so that the grille 1412 whose service life has reached the limit can be replaced conveniently later. A first concave seat 1413 is provided below the grille 1412 located at the bottom, and a transverse screw 1414 is rotatably installed in the first concave seat 1413, and a first sliding platform 1415 and a second sliding platform 1431 are threadedly installed on the transverse screw 1414. In order to ensure the stable sliding of the first sliding platform 1415 and the second sliding platform 1431, two cross arms are fixed in the first concave seat 1413, and the two cross arms penetrate the first sliding platform 1415 and the second sliding platform 1431 and are slidably connected with the two. An air blowing mechanism is provided on the first sliding platform 1415, and a spraying mechanism is provided on the second sliding platform 1431. The spraying mechanism and the air blowing mechanism are used to clean and dry the grille 1412 after use, so that the grille 1412 can be cleaned quickly after use, which is convenient for the next use.

[0062] Exemplarily, the air blowing mechanism includes a second concave seat 1416, in which a first bidirectional lead screw 1417 is rotatably installed, and a first linkage plate 1418 and a second linkage plate 1419 are threadedly installed on the first bidirectional lead screw 1417. A second reduction motor is fixedly installed on an outer wall of one side of the second concave seat 1416, and its output shaft is fixedly connected to one end of the first bidirectional lead screw 1417, and two first reinforcing rods are fixed in the second concave seat 1416, and the two first reinforcing rods pass through the first linkage plate 1418 and the second linkage plate 1419 and are slidably connected to the two. A first clamping cover 1420 is fixedly installed on one side of the first linkage plate 1418 close to the second linkage plate 1419, and a second clamping cover 1421 is fixedly installed on one side of the second linkage plate 1419 close to the first linkage plate 1418. The first clamping cover 1420 and the second clamping cover 1421 are adapted to each other, and the grille 1412 located below is located between the two. The bottom of the second clamping cover 1421 is set as an opening for discharging dirt. A vent head 1422 is fixedly installed on one side of the first clamping cover 1420 away from the second clamping cover 1421, one end of the vent head 1422 extends into the first clamping cover 1420 and is fixedly installed with a first hollow circular plate 1423, a plurality of air nozzles 1424 are fixedly installed on one side of the first hollow circular plate 1423 close to the second clamping cover 1421, one end of a vent hose 1425 is fixedly installed on the air outlet port of the air compressor 111, the other end of the vent hose 1425 is fixedly connected to the vent head 1422, and an air valve is provided on the vent hose 1425. The compressed gas of the air compressor 111 itself is introduced into the first hollow circular plate 1423, thereby realizing the air blowing function, saving energy, and being conducive to providing auxiliary adjustment means (mainly small pressure relief adjustment) on the air pressure stability of the air source.

[0063] A scraper bar 1426 is provided in the second clamping cover 1421, and a circular frame 1427 is provided on the side of the second clamping cover 1421 away from the first clamping cover 1420. A linkage shaft 1428 is rotatably installed on the side of the circular frame 1427 close to the second clamping cover 1421, one end of the linkage shaft 1428 extends into the second clamping cover 1421 and is fixedly connected to the scraper bar 1426, and the linkage shaft 1428 is slidably connected to the second clamping cover 1421. A second cylinder 1429 is fixedly installed on the outer wall of one side of the second clamping cover 1421, and a supporting block 1430 is fixedly installed on its output shaft, and the bottom of the supporting block 1430 is fixedly connected to the circular frame 1427, and a second servo motor is fixedly installed in the circular frame 1427, and its output shaft is fixedly connected to one end of the linkage shaft 1428. While blowing air, the scraper bar 1426 can be used to scrape off the attachments on the grille 1412 more thoroughly.

[0064] The spray mechanism includes a third concave seat 1432, in which a second bidirectional lead screw 1433 is rotatably installed, and a third reduction motor is fixedly installed on an outer wall of one side of the third concave seat 1432, whose output shaft is fixedly connected to one end of the second bidirectional lead screw 1433, and a third linkage plate 1434 and a fourth linkage plate 1435 are threadedly installed on the second bidirectional lead screw 1433, and two second reinforcing rods are fixed in the third concave seat 1432, and the two second reinforcing rods pass through the third linkage plate 1434 and the fourth linkage plate 1435 and are slidably connected to the two, a third clamping cover 1436 is fixedly installed on one side of the third linkage plate 1434 close to the fourth linkage plate 1435, and a third clamping cover 1436 is fixedly installed on one side of the fourth linkage plate 1435 close to the third linkage plate 1434 A fourth clamping cover 1437 is fixedly installed, a water pump 1438 is fixedly installed on the side of the third linkage plate 1434 away from the fourth linkage plate 1435, one end of a water pipe 1439 is fixedly installed on the water outlet of the water pump 1438, the other end of the water pipe 1439 extends into the third clamping cover 1436 and is fixedly installed with a second hollow circular plate 1440, a plurality of water spray heads 1441 are fixedly installed on the side of the second hollow circular plate 1440 close to the fourth clamping cover 1437, a fan 1442 is fixedly installed on the side of the fourth linkage plate 1435 away from the third linkage plate 1434, one end of an air supply pipe 1443 is fixedly installed on the air outlet of the fan 1442, the other end of the air supply pipe 1443 extends into the fourth clamping cover 1437 and is fixedly installed with an air outlet nozzle 1444. In this way, the grille 1412 can be sprayed and flushed first, and then quickly dried by wind, which will not affect the next use.

[0065] In this embodiment, in order to allow the first clamping cover 1420 and the second clamping cover 1421 to be closed to each other, and the third clamping cover 1436 and the fourth clamping cover 1437 to be closed to each other, arc-shaped avoidance grooves are opened on the top of the first clamping cover 1420, the second clamping cover 1421, the third clamping cover 1436 and the fourth clamping cover 1437, and the arc-shaped avoidance grooves are adapted to the connecting rod 1411. When closing, the connecting rod 1411 enters into the two arc-shaped avoidance grooves, thereby not causing interference.

[0066] In order to collect the blown and scraped impurities, a support platform is fixedly installed on one side of the second linkage plate 1419 close to the first linkage plate 1418, and a placement groove is opened on the top thereof. A debris box is arranged in the placement groove, and the debris box is located below the second clamping cover 1421.

[0067] In order to discharge the sewage after spraying, sewage outlets are opened at the bottom of the third clamping cover 1436 and the fourth clamping cover 1437, and a water diversion bucket is fixedly installed in the third concave seat 1432, and the water diversion bucket is located below the third clamping cover 1436 and the fourth clamping cover 1437.

[0068] In the initial state, the output shafts of the first cylinder 1403 and the second cylinder 1429 are both extended, and the water inlet port of the water pump 1438 is connected to the external water tank through an external pipe. In addition, in the daily state, the first clamp cover 1420 and the second clamp cover 1421 are closed to cover the unused grille 1412 to protect it to a certain extent. In addition, the sewage discharge port of the water diversion bucket is connected to the external sewage tank through an external hose.

[0069] When the air compressor 111 is running, it starts to extract air from the cabin, and during the extraction process, it will first be processed by the pre-processing mechanism 140 to intercept larger suspended impurities in the air, so that the air entering the air compressor 111 does not contain suspended impurities, ensuring the stable operation of the air compressor 111.

[0070] In subsequent use, when the grid 1412 in use (the grid 1412 located at the top in this state) needs to be cleaned due to too many large floating objects attached to it, the second reduction motor is first started, and its output shaft drives the first bidirectional screw 1417 to rotate, so that the first linkage plate 1418 and the second linkage plate 1419 move away from each other, and finally the first clamping cover 1420 and the second clamping cover 1421 are separated, and the grid 1412 is exposed. Then, the output shaft of the first cylinder 1403 is started to retract, and the expanded tube 1402 is separated from the grid 1412 in use. Then, the first servo motor is started, and its output shaft drives the transmission rod 1406 to rotate, so as to drive the connecting block 1407 to rotate. At this time, the two grids 1412 also rotate accordingly until the two grids 1412 alternate positions with each other, and the first servo motor is turned off, and the output shaft of the first cylinder 1403 is started to extend, so that the expanded tube 1402 contacts the new grid 1412 again, and then the nitrogen production operation is continued.

[0071] On the other side, in order to reuse the used grille 1412, the second reduction motor can be started first, and its output shaft drives the first bidirectional lead screw 1417 to rotate, so that the first clamping cover 1420 and the second clamping cover 1421 are close to each other, and finally the used grille 1412 is covered, and then the air valve on the ventilation hose 1425 is opened, and the compressed air enters the first hollow circular plate 1423 through the ventilation hose 1425, and finally sprayed on the used grille 1412 through multiple air nozzles 1424. During the air jetting process, the attachments in the holes of the grille 1412 are blown out, and part of the attachments directly fall and fall into the glove box. At the same time, the output shaft of the second cylinder 1429 is started to retract, so that the scraper 1426 can contact the grille 1412, and then the second servo motor is started, and its output shaft drives the linkage shaft 1428 to rotate, so that the scraper 1426 rotates on the grille 1412, and directly scrapes off part of the remaining attachments thereon, and also falls into the glove box.

[0072] After the air blowing and scraping work is completed, in order to further improve the cleanliness of the grille 1412 and eliminate some residual impurities, the second reduction motor can be started in reverse to separate the first clamping cover 1420 and the second clamping cover 1421, and the grille 1412 cleaned by air blowing can be displayed again. Then the first reduction motor is started, and its output shaft drives the transverse screw 1414 to rotate, so that the first sliding platform 1415 and the second sliding platform 1431 move horizontally. After the second sliding platform 1431 moves to the previous position of the first sliding platform 1415, it can be started The output shaft of the third reduction motor on the third concave seat 1432 drives the second bidirectional screw 1433 to rotate, so that the third clamping cover 1436 and the fourth clamping cover 1437 are close to each other, and finally cover the grille 1412, and then start the water pump 1438, which draws water from the external water pool, pumps the water into the second hollow circular plate 1440, and sprays it on the grille 1412, so that the grille 1412 can be flushed and cleaned, and the flushed sewage is discharged from the sewage outlet at the bottom of the third clamping cover 1436 and the fourth clamping cover 1437 into the water diversion bucket.

[0073] After the flushing is completed, the fan 1442 is started, and the fan 1442 sends hot air into the third clamping cover 1436 and the fourth clamping cover 1437, so that the grille 1412 after the spraying can be quickly dried until the drying is completed. The third reduction motor is started to reverse, and the dried grille 1412 is displayed, and then the first reduction motor is started to rotate in the reverse direction to bring the grille 1412 back between the first clamping cover 1420 and the second clamping cover 1421, and then the second reduction motor is started to cover the grille 1412, waiting for the next replacement of the grille 1412.

[0074] By deploying the pre-treatment mechanism 140 in front of the air compressor 111, the air before entering the air compressor 111 can be roughly filtered and larger floating impurities therein can be intercepted, thereby increasing the service life of the air compressor 111. In addition, the two grilles 1412 can be rotated and used alternately. After one of the grilles 1412 has been used for a period of time, the other clean grille 1412 is rotated up and continued to be used. The used grille 1412 can be double-cleaned by the set air blowing mechanism and spraying mechanism, so that it can continue to be put into the next filtering use, thereby increasing the service life of the single grille 1412.

[0075] In summary, the embodiment of the present application provides a dual-fuel ship supporting membrane nitrogen making device 100, including a compression and cold drying mechanism 110 and a skid-mounted nitrogen generator 120, the compression and cold drying mechanism 110 includes an air compressor 111 (a screw air compressor 111 is used, and the compressed air is used as compressed air after relatively stable compression by the rotor, and the pressure fluctuation is very small), a primary filter 112 and a cold dryer 113, and does not contain an air buffer tank (by providing an air control scheme, boosting the pressure in the compression, primary filtration and cold drying sections, and using an integrated control cabinet 129 to control the membrane front air intake slow opening control valve 123 to slow open, optimizing the air The buffer tank, after the relevant instruments in front of the polymer membrane 124 have passed the inspection, the slow-opening control valve 123 for air inlet in front of the membrane will gradually open, and the clean raw gas will gradually enter the membrane, gradually increase the pressure, and prevent the instantaneous pressure difference from being too large to damage the polymer membrane 124). The air inlet and outlet of the primary filter 112 are connected to the air compressor 111 and the cold dryer 113 through external pipes, and the outlet of the cold dryer 113 is connected to the air inlet of the skid-mounted nitrogen generator 120 through an external pipe. The air compressor 111 compresses the ambient air and then passes through the primary filter 112 for preliminary filtration, and the cold dryer 113 performs cold drying. By deploying the primary filter 112 in front of the cold dryer 113, large solid impurities and large volumes of oil and liquid condensate are removed. While preliminarily purifying the gas source, the burden of the cold dryer 113 can be reduced, and the problem of poor-quality gas source continuously and directly entering the cold dryer 113 under severe sea conditions, which leads to dirty clogging of the evaporator of the cold dryer 113, is reduced, and the reliability and service life of the device are effectively increased. The skid-mounted nitrogen generator 120 includes a multi-stage filtering mechanism 121, a pre-membrane detection instrument 122, a pre-membrane air intake slow-opening control valve 123, a polymer membrane 124, a post-membrane detection instrument 125, a gas regulating mechanism 126, and an integrated control cabinet 129. The compressed air after cold drying enters the multi-stage filtering mechanism 121 through the air inlet of the skid-mounted nitrogen generator 120. The multi-stage filtering mechanism 121 includes a precision filter 1211, an oil removal filter 1212, and a dust filter 1213 connected in sequence for precision filtering. Filtration, oil removal filtration and dust filtration. When the gas index detected by the pre-membrane detection instrument 122 reaches the set value, the integrated control cabinet 129 controls the pre-membrane air intake slow-opening control valve 123 to slowly open, and the compressed gas filtered by the multi-stage filtration mechanism 121 is input to the polymer membrane 124 for nitrogen and oxygen separation. The post-membrane detection instrument 125 is used to detect the gas index after nitrogen and oxygen separation. The integrated control cabinet 129 controls the gas regulating mechanism 126 to regulate the gas based on the gas index after nitrogen and oxygen separation to complete nitrogen production. Since ship cabins are usually very expensive and require extremely high space utilization, the supporting equipment on board is required to meet the harsh environments such as high temperature difference, high vibration, and high corrosion that ships usually face. Therefore, the device is as integrated as possible after meeting the maintenance space as much as possible to form a skid-mounted nitrogen generator 120.This solution adopts primary filtration-cold drying (compared with the traditional heating drying solution, it can more effectively remove the gaseous water content in the compressed air)-multi-stage filtration solution to remove particles, moisture, oil droplets, dust, etc. in the compressed air, reduce the dew point of the raw gas to a pressure dew point of 3-5°C, improve the quality of the raw gas, and reduce the workload of the polymer membrane 124 (especially liquid water, the polymer membrane 124 is almost scrapped when it encounters liquid water). The gas separated by the polymer membrane 124 passes through the instrument after the membrane to determine the purity, dew point, temperature and other indicators of the nitrogen. Before the performance indicators are met, it will be vented to the atmosphere through the vent valve, and after the comprehensive performance is qualified, it will provide qualified product nitrogen to the downstream back end. The integrated control cabinet 129 cooperates with various detection instruments, valves, etc. to realize a highly automated nitrogen production process.

[0076] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0077] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A dual-fuel ship supporting membrane nitrogen generation device, characterized in that: include: Compressed cold drying mechanism and skid mounted nitrogen generator, The compression cold-drying mechanism includes an air compressor, a primary filter and a cold dryer, but does not include an air buffer tank. The air inlet of the primary filter is connected to the air compressor through an external pipeline, the air outlet of the primary filter is connected to the cold dryer through an external pipeline, and the air outlet of the cold dryer is connected to the air inlet of the skid-mounted nitrogen generator through an external pipeline, wherein the air compressor compresses the ambient air and then performs preliminary filtration through the primary filter, and the cold dryer performs cold drying treatment; The skid-mounted nitrogen generator comprises a multi-stage filtering mechanism, a pre-membrane detection instrument, a pre-membrane air intake slow-opening control valve, a polymer membrane, a post-membrane detection instrument, a gas regulating mechanism, and an integrated control cabinet. The compressed air after cold drying enters the multi-stage filtering mechanism through the air inlet of the skid-mounted nitrogen generator. The multi-stage filtering mechanism comprises a precision filter, an oil removal filter, and a dust filter connected in sequence, which are used for precision filtering, oil removal filtering, and dust filtering. When the gas index detected by the pre-membrane detection instrument reaches a set value, the integrated control cabinet controls the pre-membrane air intake slow-opening control valve to open slowly, and inputs the compressed gas filtered by the multi-stage filtering mechanism into the polymer membrane for nitrogen and oxygen separation. The post-membrane detection instrument is used to detect the gas index after nitrogen and oxygen separation. The integrated control cabinet controls the gas regulating mechanism to perform gas regulation based on the gas index after nitrogen and oxygen separation to complete nitrogen production. The dual-fuel ship supporting membrane nitrogen generation device also includes a pre-treatment mechanism, which includes a bellows, a flared pipe, a first cylinder, a connection bar, a mounting frame, a transmission rod, a first servo motor, a connection block, a frame connecting rod, a grid, a transverse screw, a first sliding platform, a second sliding platform, an air blowing mechanism, and a spraying mechanism. The air inlet of the air compressor is connected to one end of the bellows, and the other end of the bellows is fixedly installed with the flared tube, the first cylinder is fixedly installed on the top of the air compressor, the connecting strip is fixedly installed on the output shaft of the first cylinder, and the bottom end of the connecting strip is fixedly connected to the flared tube, the mounting frame is fixedly installed on a side of the air compressor away from the cold dryer, the transmission rod is rotatably installed on a side of the mounting frame away from the cold dryer, the first servo motor is fixedly installed in the mounting frame, the output shaft of the first servo motor is connected to one end of the transmission rod, the connecting block is installed on the end of the transmission rod away from the air compressor, the top and bottom of the connecting block are fixedly installed with mounting base blocks, and the two mounting base blocks are far from each other An embedding groove is provided on one side away from each other, and a connecting head is fixedly installed in each of the two embedding grooves by bolts, and the two frame connecting rods are respectively fixedly installed on the side away from each other of the two connecting heads, and the two grilles are respectively fixedly installed on the ends of the two frame connecting rods away from each other, and the grille located at the top is in contact with the flared pipe, and a first concave seat is provided below the grille located at the bottom, and a transverse screw is rotatably installed in the first concave seat, and a first sliding platform and a second sliding platform are threadedly installed on the transverse screw, an air blowing mechanism is provided on the first sliding platform, and a spraying mechanism is provided on the second sliding platform, and the spraying mechanism and the air blowing mechanism are used to clean and dry the grilles after use, and the air blowing mechanism is also used to provide auxiliary pressure relief regulation with stable air source pressure; The air blowing mechanism includes a second concave seat, a first bidirectional lead screw is rotatably installed in the second concave seat, a first linkage plate and a second linkage plate are threadedly installed on the first bidirectional lead screw, a first clamping cover is fixedly installed on a side of the first linkage plate close to the second linkage plate, a second clamping cover is fixedly installed on a side of the second linkage plate close to the first linkage plate, the first clamping cover and the second clamping cover are adapted to each other, and a grille located below is located between the two, a bottom of the second clamping cover is set as an opening, a ventilation head is fixedly installed on a side of the first clamping cover away from the second clamping cover, one end of the ventilation head extends into the first clamping cover and is fixedly installed with a first hollow circular plate, a plurality of air nozzles are fixedly installed on a side of the first hollow circular plate close to the second clamping cover, one end of a ventilation hose is fixedly installed on the air outlet port of the air compressor, the other end of the ventilation hose is fixedly connected to the ventilation head, and an air valve is provided on the ventilation hose.

2. The dual-fuel ship supporting membrane nitrogen generation device according to claim 1 is characterized in that: The compression and cold drying mechanism also includes an automatic condensate discharge valve, which is arranged at the condensate discharge port of the primary filter and is used to automatically discharge the condensate in the preliminary filtering process of the compressed air.

3. The dual-fuel ship supporting membrane nitrogen generator according to claim 1, characterized in that: Soft connection design is adopted at key points, including the connection between components and pipelines, and the connection between pipelines.

4. The dual-fuel ship supporting membrane nitrogen generator according to claim 3, characterized in that: When the key point is the connection between the component and the pipeline, the component is provided with an installation area at this key point, a shock-absorbing gasket is arranged on the installation area, screw holes are arranged on both sides of the installation area, and the soft connection is designed as follows: the pipeline fixing clamp with the shock-absorbing gasket is installed in coordination with the screw holes on both sides of the installation area of ​​the component, so as to enclose the pipeline between the component and the pipeline fixing clamp to achieve a soft connection between the component and the pipeline, wherein the pipeline fixing clamp with the shock-absorbing gasket includes a U-shaped gasket area and connection areas on both sides of the U-shaped gasket area, each connection area is provided with screw holes corresponding to the screw holes on both sides of the installation area, and the U-shaped gasket area is provided with a shock-absorbing gasket.

5. The dual-fuel ship supporting membrane nitrogen generator according to claim 3, characterized in that: When the key point is the connection between pipelines, there is a flange at the interface of the two pipelines to be connected, and the soft connection is designed as follows: the flanges at the interfaces of the two pipelines are respectively connected through a rubber joint with a central channel. The rubber joint with the central channel is spool-shaped, and a channel is opened at the axis. Through holes corresponding to the through holes on the flanges are opened on the connecting plates at both ends. The flanges and the connecting plates are connected by bolts to achieve a soft connection between the pipelines.

6. The dual-fuel ship supporting membrane nitrogen generator according to claim 1, characterized in that: A scraper strip is provided in the second clamping cover, a side of the second clamping cover away from the first clamping cover is provided with a circular frame, a side of the circular frame close to the second clamping cover is rotatably installed with a linkage shaft, one end of the linkage shaft extends into the second clamping cover and is fixedly connected to the scraper strip, and the linkage shaft is slidably connected to the second clamping cover, a second cylinder is fixedly installed on an outer wall of one side of the second clamping cover, a supporting block is fixedly installed on the output shaft of the second cylinder, the bottom of the supporting block is fixedly connected to the circular frame, a second servo motor is fixedly installed in the circular frame, and the output shaft of the second servo motor is fixedly connected to one end of the linkage shaft.

7. The dual-fuel ship supporting membrane nitrogen generator according to claim 1, characterized in that: The spray mechanism includes a third concave seat, a second bidirectional screw is rotatably installed in the third concave seat, a third linkage plate and a fourth linkage plate are threadedly installed on the second bidirectional screw, a third clamping cover is fixedly installed on a side of the third linkage plate close to the fourth linkage plate, a fourth clamping cover is fixedly installed on a side of the third linkage plate close to the third linkage plate, a water pump is fixedly installed on a water outlet port of the water pump, the other end of the water outlet port of the water pump is fixedly installed with one end of a water pipe, the other end of the water pipe extends into the third clamping cover and is fixedly installed with a second hollow circular plate, a plurality of water spray heads are fixedly installed on a side of the second hollow circular plate close to the fourth clamping cover, a fan is fixedly installed on a side of the fourth linkage plate away from the third linkage plate, one end of an air supply pipe is fixedly installed on the air outlet port of the fan, and the other end of the air supply pipe extends into the fourth clamping cover and is fixedly installed with an air outlet nozzle.

8. The dual-fuel ship supporting membrane nitrogen generator according to claim 7, characterized in that: A first reduction motor is fixedly installed on one side of the first concave seat, and an output shaft of the first reduction motor is fixedly connected to one end of the transverse moving screw, a second reduction motor is fixedly installed on an outer wall of one side of the second concave seat, an output shaft of the second reduction motor is fixedly connected to one end of the first bidirectional screw, a third reduction motor is fixedly installed on an outer wall of one side of the third concave seat, an output shaft of the third reduction motor is fixedly connected to one end of the second bidirectional screw, the first clamping cover, the second clamping cover, the third clamping cover and the fourth clamping cover are all provided with an arc-shaped avoidance groove on the top, and the arc-shaped avoidance groove is adapted to the frame connecting rod, a support platform is fixedly installed on a side of the second linkage plate close to the first linkage plate, a placement groove is provided on the top of the support platform, a debris box is provided in the placement groove, and the debris box is located below the second clamping cover, and a sewage outlet is provided at the bottom of the third clamping cover and the fourth clamping cover, and a water diversion bucket is fixedly installed in the third concave seat, and the water diversion bucket is located below the third clamping cover and the fourth clamping cover.

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