Chemical tanker inert gas system and chemical tanker

Abstract

The present application relates to a kind of chemical tanker inert gas system and chemical tanker, the system includes inert gas generating device, high-pressure inert gas bottle group, inert gas tank device, first inert gas buffer tank is arranged along first gas supply pipeline, second inert gas buffer tank, pressure regulating valve box;Inert gas generated by inert gas generating device flows through first inert gas buffer tank after first gas supply pipeline is sent to pressure regulating valve box;Inert gas generated by high-pressure inert gas bottle group and inert gas tank device flows through second inert gas buffer tank after first gas supply pipeline is sent to pressure regulating valve box;Pressure regulating valve box is realized by inert gas purging pipeline and is purged, and by inert gas air supply pipeline, air cushion protection is formed in the top of cargo hold.The present application improves inert gas supply stability and the diversity of variety of carried goods by multiple inert gas sources, is simplified by common pipeline and saves cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of chemical tankers, in particular to a chemical tanker inert gas system and a chemical tanker. BACKGROUND

[0002] Chemical tanker is a liquid cargo ship specially used for carrying toxic, flammable, volatile and corrosive liquid chemicals, which is usually divided into Class I, Class II and Class III according to the degree of harm to the environment. Class I is the most harmful to the environment, and the tank capacity must be less than 1250m 3 ; Class II is relatively low in harm to the environment, and the cargo tank volume must be less than 3000m 3 ; Class III is a cargo with relatively small harm to the environment, and its cargo tank structure is similar to that of a general product oil tanker, and its maximum tank capacity is generally not limited.

[0003] In order to be able to simultaneously load the above-mentioned Class I, Class II and Class III varieties, which are different in nature and have different system configuration requirements, the chemical tanker is designed to have many small water-tight cargo tanks. Taking a 38000-ton chemical tanker as an example, which is currently built in larger quantities, the number of cargo tanks is between 30-50, and the liquid cargo system adopts one tank one pump, which can simultaneously load and unload 5-6 liquid chemicals.

[0004] The inert gas system is a typical system on a chemical tanker, and its main function is to control the environment of the liquid cargo tank. Some liquid cargo requires isolation of oxygen, water vapor and / or other gases to prevent oxidation, chemical reaction and quality change of the chemical. The inert gas system forms a top gas cushion in the cargo tank by providing inert gas. In addition, inert gas can also be used for fire and explosion prevention. The inert gas tank after inertization is safer during washing and other operations. After washing, dry air generated by the inert system can be used for rapid ventilation and drying of the cargo tank. In addition, high-pressure inert gas can also be used to remove residual liquid cargo in the pipeline or liquid cargo tank.

[0005] Common inert gases such as nitrogen are prepared / provided by a nitrogen generator, and then provided to the cargo tank area through a pipeline system. Currently, the source of inert gas for the inert gas system is relatively single, and the safety of the inert gas system is relatively low, which cannot well adapt to the diversified demand of the chemical tanker for loading liquid cargo. SUMMARY

[0006] In order to increase the types of liquid cargo loaded on the chemical tanker and improve the safety of the inert gas system, the present application provides a chemical tanker inert gas system and a chemical tanker, which expands the source range and purity range of inert gas, simplifies the pipeline layout and saves construction cost.

[0007] The technical purpose of the present application is achieved by the following technical scheme:

[0008] A chemical tanker inert gas system, comprising:

[0009] An inert gas generating device for generating inert gas and providing dry air;

[0010] A high-pressure inert gas cylinder group for loading pressurized gaseous inert gas;

[0011] An inert gas tank device for loading liquid inert gas;

[0012] A first gas supply pipeline comprising a first inert gas buffer tank, a second inert gas buffer tank and a pressure regulating valve box arranged along the first gas supply pipeline;

[0013] The high-pressure inert gas cylinder group and the inert gas tank device are connected with a high-pressure high-purity supply pipe, and the high-pressure inert gas cylinder group and the inert gas tank device respectively provide inert gas to the second inert gas buffer tank through the high-pressure high-purity supply pipe;

[0014] The inert gas generated by the inert gas generating device flows through the first inert gas buffer tank along the first gas supply pipeline and then is sent to the pressure regulating valve box; the inert gas generated by the high-pressure inert gas cylinder group and the inert gas tank device flows through the second inert gas buffer tank and then is sent to the pressure regulating valve box along the first gas supply pipeline;

[0015] An inert gas purging pipeline for connecting the pressure regulating valve box to obtain inert gas from the first gas supply pipeline for purging the pump and / or the cargo pipeline;

[0016] An inert gas replenishment pipeline for connecting the pressure regulating valve box to obtain inert gas from the first gas supply pipeline for forming an air cushion at the top of the cargo hold for protection.

[0017] Further, the purity of the inert gas provided by the high-pressure inert gas cylinder group and the inert gas tank device is ≥ 99.99%, and the purity of the inert gas generated by the inert gas generating device is ≥ 95% and ≤ 99.9%.

[0018] Further, the inert gas generating device is further connected with a second gas supply pipeline, and the inert gas generating device delivers inert gas to the cargo manifold area of the chemical tanker through the second gas supply pipeline to inert the cargo hold or delivers dry air to dry the cargo hold; the gas pressure intensity of the inert gas delivered by the second gas supply pipeline is lower than that of the inert gas delivered by the first gas supply pipeline.

[0019] Further, the inert gas generating device is further connected with a deck miscellaneous air pipe, and the inert gas generating device provides dry air to the deck area through the deck miscellaneous air pipe.

[0020] Further, the inert gas is nitrogen, and the inert gas generating device comprises an air compressor unit, an air buffer tank, a filtering unit, an air dryer, and a nitrogen generator; the air compressor unit, the air buffer tank, and the filtering unit are sequentially connected to generate dry air; the air compressor unit, the air buffer tank, the filtering unit, and the nitrogen generator are sequentially connected to separate nitrogen from air; and the air compressor unit, the air buffer tank, and the air dryer are sequentially connected to generate dry air.

[0021] Further, the high-pressure inert gas bottle group comprises a high-pressure nitrogen gas bottle, a gas supply main pipe, and a pressure reducing valve arranged on the gas supply main pipe; the high-pressure nitrogen gas bottle is connected to the high-pressure high-purity supply pipe through the gas supply main pipe; and the gas supply main pipe is further connected to a high-pressure high-purity supply sub-pipe after passing through the pressure reducing valve, and the high-purity supply sub-pipe is connected to the pressure regulating valve box.

[0022] Further, the inert gas tank device comprises a liquid nitrogen tank, a liquid nitrogen evaporator, and a liquid nitrogen filling manifold; the liquid nitrogen tank is used to store liquid nitrogen and provide liquid nitrogen for the liquid nitrogen evaporator; the liquid nitrogen filling manifold is used to supplement liquid nitrogen for the liquid nitrogen tank; and the liquid nitrogen evaporator is used to convert the liquid nitrogen provided by the liquid nitrogen tank into nitrogen gas.

[0023] Further, the second gas supply pipeline comprises a double-stop breather valve, a pressure and vacuum protection device, an isolation valve, and a blind flange arranged along the conveying path of the second gas supply pipeline.

[0024] Further, the inert gas purging pipeline comprises a purging pipeline and a stop check valve arranged on the purging pipeline.

[0025] The inert gas supplement pipeline comprises a supplement pipeline and a stop breather valve arranged on the supplement pipeline.

[0026] The application also provides a chemical tanker, wherein the inert gas system described above is arranged on the chemical tanker; the inert gas generating device is arranged in a safety area engine room of the chemical tanker; the high-pressure inert gas bottle group and the inert gas tank device are arranged on an open deck of a dangerous area of the chemical tanker and located in the bow direction of a cargo manifold area; the inert gas supplement pipeline is connected to a breather tower on the chemical tanker; the breather tower is distributed on the open deck of the dangerous area of the chemical tanker and located on the left front side, the right front side, the left rear side, and the right rear side of the open deck; the breather tower is connected to a cargo hold breather pipe of a cargo hold through a hose, the hose is provided with a stop check valve with a quick connector, and the cargo hold breather pipe sends the inert gas to the top of the cargo hold to form a top air cushion.

[0027] Compared with the prior art, the application has the following beneficial effects:

[0028] 1. The present application forms multiple sources of inert gas through the inert gas generating device, high-pressure inert gas bottle group and inert gas tank device, improves the stability of inert gas supply and the diversity of carried goods; the inert gas generating device, high-pressure inert gas bottle group and inert gas tank device are mutually reserved, can form top air cushion protection for goods with relatively low inert gas purity requirements; the high-pressure inert gas bottle group and inert gas tank device are mutually reserved, can form top air cushion protection for goods with higher inert gas purity requirements (≥99.99%).

[0029] 2. In the present application, the first inert gas buffer tank and the second inert gas buffer tank buffer and stabilize the low-purity nitrogen and high-purity nitrogen respectively, and then supply inert gas through the first gas supply pipeline, which improves safety, simplifies pipeline arrangement, reduces space occupation and reduces construction cost. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is the schematic diagram of the inert gas system arrangement of the chemical tanker in the present application.

[0031] Figure 2 is the schematic diagram of the inert gas generating device composition in the present application.

[0032] Figure 3 is the schematic diagram of the high-pressure inert gas bottle group and inert gas tank device arrangement in the present application.

[0033] In the figure:

[0034] 1. Inert gas generating device; 2. High-pressure inert gas bottle group; 3. Inert gas tank device; 4. Air compressor unit; 5. Air buffer tank; 6. Filtration unit; 7. Nitrogen generator; 8. Air dryer; 9. High-pressure nitrogen cylinder; 10. Gas supply main pipe; 11. Pressure reducing valve; 12. Liquid nitrogen tank; 13. Liquid nitrogen evaporator; 14. Liquid nitrogen filling manifold; 15. Second gas supply pipeline; 16. Double stop breather valve; 17. Pressure vacuum protection device; 18. Isolation valve; 19. Blind flange; 20. First gas supply pipeline; 21. First inert gas buffer tank; 22. Second inert gas buffer tank; 23. Pressure regulating valve box; 24. High-pressure high-purity supply pipe; 25. Purging pipeline; 26. Stop check valve; 27. Gas supplement pipeline; 28. Stop breather valve; 29. Stop check valve with quick connector; 30. Deck miscellaneous air pipe; 31. Chemical tanker; 32. Cargo manifold area; 33. High-pressure high-purity supply sub-pipe; 34. Safety area engine room; 35. Hazardous area open deck. DETAILED DESCRIPTION

[0035] The technical solutions of the present application are further described below in combination with specific embodiments:

[0036] A chemical tanker inert gas system, inert gas such as nitrogen, as shown, comprising: Figure 1

[0037] Inert gas generating device 1, to produce nitrogen and provide dry air;

[0038] High-pressure inert gas cylinder group 2, to load pressurized nitrogen;

[0039] Inert gas tank device 3, to load liquid nitrogen;

[0040] The first gas supply pipeline 20 includes a first inert gas buffer tank 21, a second inert gas buffer tank 22, and a pressure regulating valve box 23 arranged along the first gas supply pipeline; in this embodiment, the purity of nitrogen in the first inert gas buffer tank is ≥95% and less than 99.9%, and the purity of nitrogen in the second inert gas buffer tank is ≥99.9%.

[0041] The high-pressure inert gas cylinder group 2 and the inert gas tank device 3 are connected with a high-pressure high-purity supply pipe 24, and the high-pressure inert gas cylinder group 2 and the inert gas tank device 3 respectively provide nitrogen to the second inert gas buffer tank 22 through the high-pressure high-purity supply pipe 24;

[0042] The nitrogen generated by the inert gas generating device 1 flows through the first inert gas buffer tank 21 after buffering and pressure stabilization along the first gas supply pipeline 20, and then is sent to the pressure regulating valve box 23 by the first gas supply pipeline 20; the nitrogen generated by the high-pressure inert gas cylinder group 2 and the inert gas tank device 3 flows through the second inert gas buffer tank after buffering and pressure stabilization, and is sent to the pressure regulating valve box 23 along the first gas supply pipeline 20;

[0043] The inert gas purge pipeline is used to connect the pressure regulating valve box 23 to obtain nitrogen from the first gas supply pipeline 20 for cargo pump and / or cargo pipeline purge; the inert gas purge pipeline includes a purge pipeline 25 and a stop check valve 26 arranged on the purge pipeline 25, and the purge pipeline is connected to the pressure regulating valve box 23.

[0044] The inert gas replenishment pipeline is used to connect the pressure regulating valve box 23 to obtain nitrogen from the first gas supply pipeline 20 to form an air cushion on the top of the cargo hold for protection; the inert gas replenishment pipeline includes a replenishment pipeline 27 and a stop air valve 28 arranged on the replenishment pipeline 27, and the replenishment pipeline 27 is connected to the pressure regulating valve box 23.

[0045] ​The high-pressure inert gas bottle group 2 and the inert gas tank device 3 use finished inert gas, so they can provide inert gas with high purity or liquefied inert gas. The inert gas generation device 1 uses on-site preparation, so the purity of the inert gas is lower than that of the finished inert gas and the liquefied inert gas. In this embodiment, the purity of the nitrogen gas provided by the high-pressure inert gas bottle group 2 and the inert gas tank device 3 is ≥99.99%, and the purity of the nitrogen gas generated by the inert gas generation device 1 is 95%-99.9%.

[0046] More specifically, as shown in Figure 2 , the inert gas generation device 1 includes an air compressor unit 4, an air buffer tank 5, a filtering unit 6, an air dryer 8, and a nitrogen generator 7. The air compressor unit, the air buffer tank, and the filtering unit are connected in sequence to generate dry air. The air compressor unit 4, the air buffer tank 5, the filtering unit 6, and the nitrogen generator 7 are connected in sequence by pipelines to separate nitrogen gas from air. The air compressor unit 4, the air buffer tank 5, and the air dryer 8 are connected in sequence to generate dry air.

[0047] The air compressor unit 4, also known as an air compressor unit, outputs compressed air through several air compressors. The compressed air enters the air buffer tank 5 for buffering and then outputs stable compressed air. The compressed air passes through the filtering unit 6 for filtering to remove oil, water, dust, and other impurities in the compressed air to generate dry air. The nitrogen generator is an adsorption-type nitrogen generator (PSA). The nitrogen generator is equipped with an adsorption tower containing carbon molecular sieve. The carbon molecular sieve adsorbs oxygen in the air. After removing oxygen, the main gas component is nitrogen, and the concentration of nitrogen is 95%-99.9%. The air buffer tank 5 outputs stable compressed air, which is dried by the air dryer 8 to form dry air. Preparing nitrogen gas from compressed air is a prior art. For example, Zang Dawei, Chen Li, Wang Kun, et al. Full nitrogen gas system on 55000t chemical ship [J]. Ship power plant, 2017, No. 6.

[0048] More specifically, as shown in Figure 3 , the high-pressure inert gas bottle group 2 includes several high-pressure nitrogen gas bottles 9, a gas supply main pipe 10, and a pressure reducing valve 11 arranged on the gas supply main pipe 10. The high-pressure nitrogen gas bottles 9 store 200 bar high-pressure nitrogen gas. The high-pressure nitrogen gas bottle group 2 outputs 8 bar high-purity nitrogen gas after pressure reduction by the pressure reducing valve 11 and then transmits the high-purity nitrogen gas to the second inert gas buffer tank 22 for stable pressure buffering. The gas supply main pipe 10 is also connected to a high-pressure high-purity supply auxiliary pipe 33 after passing through the pressure reducing valve 11. The high-purity supply auxiliary pipe 33 is connected to a pressure regulating valve box 23. The pressure regulating valve box 23 can output 0.17 bar high-purity low-pressure nitrogen gas after pressure regulation. The 0.17 bar high-purity low-pressure nitrogen gas is transmitted through the air supply pipeline 27 and finally forms an air cushion on the top of the cargo hold for protection.

[0049] The inert gas tank device 3 includes a liquid nitrogen tank 12, a liquid nitrogen evaporator 13, and a liquid nitrogen filling manifold 14. The liquid nitrogen tank 12 is used to store liquid nitrogen and supply liquid nitrogen to the liquid nitrogen evaporator 13. The liquid nitrogen filling manifold 14 is used to replenish liquid nitrogen to the liquid nitrogen tank 12. The liquid nitrogen evaporator 13 is used to convert the liquid nitrogen supplied by the liquid nitrogen tank 12 into nitrogen gas. In this embodiment, the liquid nitrogen evaporator 13 outputs high-purity nitrogen gas at 8 bar. The generated nitrogen gas is then transported to the second inert gas buffer tank 22 for buffering and stabilization through a high-pressure, high-purity supply pipe.

[0050] In this embodiment, the inert gas generating device 1 outputs low-pressure nitrogen gas of 0.17 bar and high-pressure nitrogen gas of 8 bar through the nitrogen generator 7, and outputs dry air through the filter unit 6. The 0.17 bar low-pressure nitrogen gas output by the nitrogen generator 7 is transported to the cargo manifold area of ​​the chemical tanker through the second gas supply pipeline 15 to inertify the cargo tank, or the dry air output by the filter unit 6 is transported to the cargo manifold area of ​​the chemical tanker through the second gas supply pipeline 15 without passing through the nitrogen generator 7 to dry the cargo tank.

[0051] More specifically, a double-stop vent valve 16, a pressure vacuum protection device 17, an isolation valve 18, and a blind flange 19 are sequentially installed along the delivery path of the second air supply line 15. After removing the blind flange 19, a connecting hose is connected to the cargo manifold to deliver nitrogen into the cargo hold for inerting or to deliver dry air into the cargo hold for ventilation and drying. Through the pressure vacuum protection device 17, when the pressure in the pipeline is high, exhaust gas is released into the atmosphere; when the pressure is low, air is drawn in to replenish the pressure.

[0052] The high-pressure nitrogen gas of 8 bar output from the nitrogen generator 7, the high-pressure nitrogen gas of 8 bar output from the high-pressure inert gas cylinder group, or the high-pressure nitrogen gas of 8 bar output from the inert gas tank device 3 are transported through the first gas supply pipeline 20.

[0053] The air dryer 8 of the inert gas generator 1 outputs 8 bar of dry air, which is supplied to the equipment in the deck area through the deck miscellaneous air pipe 30. The dry air can be used for the driving power of the equipment on the deck and for deck purging.

[0054] After passing through the pressure regulating valve box 23, 8 bar of nitrogen is output to the inert gas purging line for purging the cargo pump / cargo pipeline to remove residual liquid cargo remaining in the pipeline or liquid cargo tank. The 8 bar of nitrogen in the inert gas purging line can be either high-purity nitrogen with a purity of ≥99.9% or low-purity nitrogen with a purity of ≥95% and ≤99.9%. The nitrogen concentration required for purging depends on the type of chemical liquid cargo being transported. The pressure regulating valve box 23 outputs 0.17 bar of low-pressure nitrogen to the inert gas replenishment line.

[0055] It should be noted that the nitrogen pressures of 0.17 bar and 8 bar output in this embodiment are merely commonly used nitrogen pressures and are not intended to limit the invention. The nitrogen pressures output by the nitrogen generator 7, the pressure regulating valve box 23, and the liquid nitrogen evaporator 13 can be adjusted according to actual needs.

[0056] This embodiment also provides a chemical tanker, such as Figure 1 As shown, the aforementioned inert gas system is arranged on the chemical tanker 31; the inert gas generator 1 is arranged in the engine room 34 of the safe area of ​​the chemical tanker 31, the high-pressure inert gas cylinder group 2 and the inert gas tank device 3 are arranged on the open deck 35 of the hazardous area of ​​the chemical tanker and are located in the bow direction of the cargo manifold area 32; the inert gas replenishment pipeline is connected to the venting tower 29 on the chemical tanker, the venting tower 29 is distributed on the open deck of the hazardous area of ​​the chemical tanker and is located on the port front, starboard front, port rear and starboard rear sides of the open deck; the venting tower 29 is connected to the cargo hold venting pipe of the cargo hold through a hose, the hose is equipped with a quick-connect check valve 29, and the cargo hold venting pipe delivers inert gas to the top of the cargo hold to form a top air cushion.

[0057] For goods where nitrogen purity requirements are not too high, the inert gas generator 1, the high-pressure inert gas cylinder group 2, and the inert gas tank device 3 serve as backups for each other and can all supply nitrogen. However, for goods with higher nitrogen purity requirements, such as those requiring nitrogen purity ≥ 99.99%, the high-pressure inert gas cylinder group 2 and the inert gas tank device 3 serve as backups for each other and can provide nitrogen of higher purity.

[0058] This embodiment is merely a further explanation of the present invention and is not intended to limit the present invention. Those skilled in the art can make non-inventive modifications to this embodiment as needed after reading this specification, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An inert gas system for a chemical tanker, characterized in that, include: An inert gas generating device, used to generate inert gas and provide dry air; High-pressure inert gas cylinder assembly, used to load pressurized gaseous inert gas; Inert gas container device, used to hold liquid inert gas; The first gas supply pipeline includes a first inert gas buffer tank, a second inert gas buffer tank, and a pressure regulating valve box installed along the first gas supply pipeline. The high-pressure inert gas cylinder group and the inert gas tank device are connected to a high-pressure, high-purity supply pipe. The high-pressure inert gas cylinder group and the inert gas tank device respectively supply inert gas to the second inert gas buffer tank through the high-pressure, high-purity supply pipe. The inert gas generated by the inert gas generator flows through the first inert gas buffer tank along the first gas supply pipeline and is then sent to the pressure regulating valve box; the inert gas generated by the high-pressure inert gas cylinder group and inert gas tank device flows through the second inert gas buffer tank and is then sent to the pressure regulating valve box along the first gas supply pipeline. An inert gas purging line is used to connect a pressure regulating valve box to obtain inert gas from the first gas supply line for purging the cargo pump and / or cargo pipeline. An inert gas replenishment line is used to connect to a pressure regulating valve box to obtain inert gas from the first gas supply line to form an air cushion protection on the top of the cargo hold.

2. The inert gas system for a chemical tanker according to claim 1, characterized in that, The purity of the inert gas provided by the high-pressure inert gas cylinder group and inert gas tank device is ≥99.99%, and the purity of the inert gas generated by the inert gas generator is ≥95% and ≤99.9%.

3. The inert gas system for a chemical tanker according to claim 1, characterized in that, The inert gas generator is also connected to a second gas supply line. The inert gas generator supplies inert gas to the cargo collection area of ​​the chemical tanker through the second gas supply line to inertize the cargo hold or supplies dry air to dry the cargo hold. The pressure of the inert gas supplied by the second gas supply line is lower than that of the inert gas supplied by the first gas supply line.

4. The inert gas system for a chemical tanker according to claim 1, characterized in that, The inert gas generator is also connected to a deck miscellaneous air pipe, through which the inert gas generator supplies dry air to the deck area.

5. The inert gas system for a chemical tanker according to claim 1, characterized in that, The inert gas is nitrogen, and the inert gas generating device includes an air compressor unit, an air buffer tank, a filter unit, an air dryer, and a nitrogen generator; the air compressor unit, air buffer tank, and filter unit are connected in sequence to generate dry air; the air compressor unit, air buffer tank, filter unit, and nitrogen generator are connected in sequence to separate nitrogen from the air; the air compressor unit, air buffer tank, and air dryer are connected in sequence to generate dry air.

6. The inert gas system for a chemical tanker according to claim 5, characterized in that, The high-pressure inert gas cylinder group includes a high-pressure nitrogen cylinder, a main gas supply pipe, and a pressure reducing valve installed on the main gas supply pipe. The high-pressure nitrogen cylinder is connected to a high-pressure, high-purity supply pipe through the main gas supply pipe. After passing through the pressure reducing valve, the main gas supply pipe is also connected to a high-pressure, high-purity supply auxiliary pipe, which is connected to the pressure regulating valve box.

7. The inert gas system for a chemical tanker according to claim 5, characterized in that, The inert gas tank device includes a liquid nitrogen tank, a liquid nitrogen evaporator, and a liquid nitrogen filling manifold. The liquid nitrogen tank is used to store liquid nitrogen and supply liquid nitrogen to the liquid nitrogen evaporator. The liquid nitrogen filling manifold is used to replenish liquid nitrogen to the liquid nitrogen tank. The liquid nitrogen evaporator is used to convert the liquid nitrogen supplied by the liquid nitrogen tank into nitrogen gas.

8. The inert gas system for a chemical tanker according to claim 3, characterized in that, The second gas supply line includes a double-stop vent valve, a pressure vacuum protection device, an isolation valve, and a blind flange installed along the delivery path of the second gas supply line.

9. The inert gas system for a chemical tanker according to claim 1, characterized in that, The inert gas purging pipeline includes a purging pipeline and a shut-off check valve installed on the purging pipeline; The inert gas replenishment pipeline includes a replenishment pipeline and a shut-off vent valve installed on the replenishment pipeline.

10. A chemical tanker, characterized in that, The chemical tanker is equipped with an inert gas system as described in any one of claims 1-9; the inert gas generator is located in the engine room of the safe area of ​​the chemical tanker; the high-pressure inert gas cylinder group and the inert gas tank device are located on the open deck of the hazardous area of ​​the chemical tanker and are situated in the bow direction of the cargo manifold area; the inert gas replenishment pipeline is connected to the venting towers on the chemical tanker, and the venting towers are distributed on the open deck of the hazardous area of ​​the chemical tanker and are located on the port front, starboard front, port aft, and starboard aft sides of the open deck; the venting towers are connected to the cargo hold venting pipes of the cargo hold via hoses, and the hoses are equipped with shut-off check valves with quick connectors; the cargo hold venting pipes deliver the inert gas to the top of the cargo hold to form a top air cushion.

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