CN116878779A - Gas detection device, gas detection method and gas detection system - Google Patents
Gas detection device, gas detection method and gas detection system Download PDFInfo
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- CN116878779A CN116878779A CN202310172456.5A CN202310172456A CN116878779A CN 116878779 A CN116878779 A CN 116878779A CN 202310172456 A CN202310172456 A CN 202310172456A CN 116878779 A CN116878779 A CN 116878779A
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- 238000001514 detection method Methods 0.000 title claims abstract description 82
- 238000005070 sampling Methods 0.000 claims abstract description 114
- 239000007788 liquid Substances 0.000 claims abstract description 85
- 239000012530 fluid Substances 0.000 claims 1
- 239000013535 sea water Substances 0.000 abstract description 42
- 238000007654 immersion Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 118
- 239000000969 carrier Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical group CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 239000003915 liquefied petroleum gas Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3272—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers for verifying the internal pressure of closed containers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/22—Fuels; Explosives
- G01N33/225—Gaseous fuels, e.g. natural gas
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Abstract
The application discloses a gas detection device, a gas detection method and a gas detection system. The main pipeline is fixedly arranged at the top end of the sampling tank and is communicated with the sampling tank, and the main pipeline extends out of the sampling tank into the sampling tank in the direction from the top end to the bottom end. The gas sensor is connected with the main pipeline and is contacted with gas in the main pipeline. The first flow path comprises an air inlet end and an air outlet end which are respectively arranged on the side wall of the main pipeline, and the air flows along the air inlet end to the air outlet end so as to form an air flow path. The second flow path includes an inlet pipe and an outlet pipe respectively provided on a side wall of the sampling tank, and the liquid circulates along the inlet pipe to the outlet pipe to form a liquid circulation path. The application avoids the reduction of the service life and the detection failure caused by the immersion of the gas sensor in the seawater, prolongs the service life of the sensor and improves the detection effectiveness.
Description
Technical Field
The application relates to the technical field of liquefied gas carrier gas detection, in particular to a gas detection device, a gas detection method and a gas detection system.
Background
Liquefied gas carriers are liquid cargo carriers for specially transporting liquefied gas, and can be classified into liquefied weather carriers (the main component is methane) and liquefied petroleum gas carriers (the main component is propane). On liquefied gas carriers, it is often necessary to heat and evaporate liquid cargo into gas. The most economical heating mode is to use seawater as a heating medium, and heat the introduced liquid cargo through a heat exchanger to evaporate the liquid cargo into gas.
According to the international bulk transport liquefied gas carrier construction and equipment Code (IGC Code) requirements, the liquefied gas carrier should be equipped with a gas detection system for any cargo heating or cooling medium, and if the heat exchanger leaks, cargo vapors may be mixed with seawater within the heat exchanger. A gas detection system is typically disposed outboard of the liquid cargo seawater and is capable of detecting whether the liquid cargo seawater contains a leaking cargo gas to determine whether the heat exchanger is leaking.
At present, in a liquefied gas carrier, in order to meet the requirement of gas detection, liquid cargo seawater flowing through a heat exchanger is provided with a liquid cargo seawater sampling tank (hereinafter referred to as sampling tank) at a gas detection position, seawater flows from a branch pipe on a main pipeline of a liquid cargo seawater system to the sampling tank and returns to the downstream of the main pipeline of the liquid cargo seawater, and a gas sensor is directly arranged at the top of the sampling tank. Due to the high pressure of the liquid cargo seawater there, the liquid cargo seawater will completely fill the sampling tank, thereby causing the gas sensor to be immersed in the seawater within the sampling tank at all times. Because the corrosiveness of the seawater is large, the gas sensor is always immersed in the seawater in the sampling tank to corrode the sensor, so that the service life of the gas sensor is greatly reduced. And, the gas dissipated in the rapidly flowing seawater is difficult to be captured and detected by the gas sensor. If the heat exchanger leaks without being detected by the gas sensor, seawater in the heat exchanger leaks into the cargo system to pollute the cargo, and if the cargo gas mixed into the liquid cargo seawater is flammable and explosive, the leakage of the heat exchanger also causes gas leakage, so that the gas may enter other systems, and a greater danger may be caused.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present application aims to provide a gas detection device, a gas detection method and a gas detection system, so that a gas sensor is always in a gas environment, and it is ensured that not only can the gas in the liquid cargo seawater escape to facilitate the detection of the sensor, but also the seawater can be ensured to continuously flow, thus not only solving the requirement of the liquefied gas ship on continuous monitoring of the gas detection of the liquid cargo seawater system, but also improving the accuracy of the gas detection and prolonging the service life of the sensor.
To achieve the above and other related objects, the present application provides a gas detection apparatus comprising:
the sampling tank comprises a top end and a bottom end which are oppositely arranged;
the main pipeline is fixedly arranged at the top end of the sampling tank and communicated with the sampling tank, and the main pipeline extends out of the sampling tank to the inside of the sampling tank along the direction from the top end to the bottom end;
the gas sensor is connected with the main pipeline and is contacted with gas in the main pipeline;
the first flow path comprises an air inlet end and an air outlet end which are respectively arranged on the side wall of the main pipeline, and the air flows along the air inlet end to the air outlet end to form an air flow path;
the second flow path is arranged on one side of the sampling tank close to the bottom end and comprises an inlet pipeline and an outlet pipeline which are respectively arranged on the side wall of the sampling tank, and liquid circulates along the inlet pipeline to the outlet pipeline to form a liquid flow path.
Optionally, the inlet conduit has a height in a bottom-to-top direction that is higher than the height of the outlet conduit.
Optionally, the height of the air inlet end is lower than the height of the air outlet end in the direction from the bottom end to the top end.
Optionally, the main line extending into the sampling tank comprises:
the extension pipeline extends into the sampling tank from the top end of the sampling tank, and is provided with at least one first through hole;
the pipe cap is arranged at the port of the extension pipeline and is provided with a second through hole.
Optionally, three first through holes are arranged on the extension pipeline and are uniformly distributed along the radial direction of the extension pipeline.
Optionally, a first flow mirror is further disposed on a side wall of the sampling tank, and the height of the first flow mirror in the direction from the bottom end to the top end is the same as the height of the pipe cap in the direction from the bottom end to the top end.
Optionally, an inlet pipeline branch is arranged on the inlet pipeline, and an outlet pipeline branch is arranged on the outlet pipeline.
Optionally, a manual ball valve is arranged on the outlet pipeline branch.
Optionally, a discharging pipeline is arranged at the bottom end of the sampling tank, and the discharging pipeline is communicated with the sampling tank.
Optionally, the inlet pipeline is communicated with a heat exchange pipeline of a heat exchanger of the liquefied gas carrier, and a liquid medium flows in the heat exchange pipeline.
The embodiment also provides a gas detection method, which is performed by adopting the gas detection device, and comprises the following steps:
introducing compressed air into the first circulation path, so that the compressed air enters the sampling tank through the main pipeline, and introducing liquid medium into the second circulation path, so that the liquid medium enters the sampling tank through the inlet pipeline;
when the liquid level of the liquid medium rises to the port of the main pipeline in the sampling tank, controlling the inlet pressure of the compressed air to be larger than the inlet pressure of the liquid medium, so that the liquid level of the liquid medium is always below the port of the main pipeline in the sampling tank;
after the internal pressure of the sampling tank reaches equilibrium, a gas sensor is adopted to detect the gas component emitted from the liquid medium in the sampling tank into the main pipeline.
Optionally, after the step of detecting the gas component emitted from the liquid in the sampling tank into the main pipe by the gas sensor, the method further comprises:
judging whether the heat exchanger of the liquefied gas carrier leaks according to the detection result of the gas sensor.
The application also provides a gas detection system comprising:
a heat exchange medium supply line;
the liquid cargo tank is internally provided with liquid cargo, a heat exchange device is arranged in the liquid cargo tank, the heat exchange device is communicated with a heat exchange medium supply pipeline, and the liquid in the liquid cargo tank is heated into gas through the heat exchange medium;
the heat exchange medium discharge pipeline is communicated with the heat exchange device;
and the inlet pipeline of the gas detection device is communicated with the heat exchange medium discharge pipeline so as to facilitate the gas sensor in the gas detection device to detect the gas emitted in the heat exchange medium, and the gas detection device is the gas detection device.
Compared with the prior art, the gas detection device, the gas detection method and the gas detection system have at least the following beneficial effects:
the gas detection device comprises a sampling tank, a main pipeline, a gas sensor, a first flow path and a second flow path. Wherein, the sampling jar includes the top and the bottom of relative setting. The main pipeline is fixedly arranged at the top end of the sampling tank and is communicated with the sampling tank, and the main pipeline extends out of the sampling tank into the sampling tank in the direction from the top end to the bottom end. The gas sensor is connected with the main pipeline and is contacted with gas in the main pipeline. The first flow path comprises an air inlet end and an air outlet end which are respectively arranged on the side wall of the main pipeline, and the air flows along the air inlet end to the air outlet end so as to form an air flow path. The second flow path is arranged on one side of the sampling tank close to the bottom end and comprises an inlet pipeline and an outlet pipeline which are respectively arranged on the side wall of the sampling tank, and liquid circulates along the inlet pipeline to the outlet pipeline to form a liquid flow path. According to the ship compressed air system, the air inlet end and the air outlet end are arranged on the main pipeline, the air inlet end is connected with the ship compressed air system, and compressed air continuously enters the main pipeline through the air inlet end and is discharged from the air outlet end. The position that the sampling jar is close to the bottom sets up import pipeline and export pipeline, and the liquid of exhaust in the heat exchanger gets into in the sampling jar by import pipeline to discharge through the export pipeline. The liquid level in the sampling tank is in a proper position by pressurizing the sampling tank by compressed air, and the gas sensor connected with the main pipeline is always in a gas environment. When the pressure balance is achieved between the compressed air and the seawater in the sampling tank, the gas dissipated in the liquid cargo seawater can be smoothly detected by the gas detection sensor through the pipeline inside the sampling tank, and meanwhile, the sensor is prevented from being immersed in the seawater to reduce the service life and cause detection failure, so that the service life of the sensor is prolonged, and the detection effectiveness is improved.
The gas detection method is carried out by adopting the gas detection device, and the gas detection system comprises the gas detection device, so that the technical effects can be realized.
Drawings
FIG. 1 is a schematic view of a gas detecting apparatus according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a main pipeline extending into a sampling tank according to an embodiment of the present application;
FIG. 3 is a schematic flow diagram of a gas or liquid flowing through the gas detection device according to an embodiment of the present application.
List of reference numerals:
1. sampling tank
11. Top end
12. Bottom end
2. Main pipeline
21. Extension pipeline
211. First through hole
22. Pipe cap
221. Second through hole
3. Gas sensor
4. First flow path
41. Air inlet end
42. Air outlet end
5. Second flow path
51. Inlet pipeline
511. Air inlet pipeline branch
52. Air outlet pipeline
521. Air outlet pipeline branch
61. First view mirror
62. Second view mirror
7. Relief pipeline
8. Tank body base
9. Blind flange
Detailed Description
Further advantages and effects of the present application will become apparent to those skilled in the art from the disclosure of the present application, which is described by the following specific examples. The application may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that the illustrations provided in the embodiments of the application are merely schematic illustrations of the basic concepts of the application, and only the components related to the application are shown in the illustrations, rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of each component in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated. The structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure for understanding and reading by those skilled in the art, and are not intended to limit the scope of the application, which is defined by the claims, so that any structural modifications, proportional changes, or dimensional adjustments should be made without affecting the efficacy or achievement of the present application.
Example 1
The present embodiment provides a gas detection apparatus including a sampling tank 1, a main pipe 2, a gas sensor 3, a first flow path 4, and a second flow path 5, with reference to fig. 1 and 3. Wherein the sampling tank 1 comprises a top end 11 and a bottom end 12 arranged opposite each other. The main pipeline 2 is fixedly arranged at the top end 11 of the sampling tank 1 and is communicated with the sampling tank 1, and the main pipeline 2 extends from the outside of the sampling tank 1 into the sampling tank 1 along the direction from the top end 11 to the bottom end 12. The gas sensor 3 is connected to the main pipe 2 and is in contact with the gas in the main pipe 2. Referring to fig. 3, the first flow path 4 includes an inlet end 41 and an outlet end 42 provided on side walls of the main pipe 2, respectively, and gas flows along the inlet end 41 to the outlet end 42 to form a gas flow path. The second flow path 5 is disposed on a side of the sampling tank 1 near the bottom end 12, and includes an inlet pipe 51 and an outlet pipe 52 disposed on the side walls of the sampling tank 1, and the liquid flows along the inlet pipe 51 to the outlet pipe 52 to form a liquid flow path.
Specifically, referring to fig. 1, the sampling tank 1 is a closed container, and the side wall of the tank body can be rolled by welded steel pipes or steel plates. The tank body can be welded on the side wall of the tank body through flanges and pipe caps with corresponding specifications to form a whole. Alternatively, the tank is cylindrical and has a cross-sectional diameter of 300mm. The sampling tank 1 comprises a top end 11 and a bottom end 12 arranged opposite each other. In this embodiment, the top 11 of the can is formed by bolting a flange (not shown) provided on the upper side wall of the can to the blind flange 9. Optionally, a rubber gasket (not labeled in the figure) is further arranged between the flange of the tank body and the blind flange 9, and the tank body is sealed by adopting the rubber gasket. Alternatively, the blind flange 9 has a diameter of 300mm. Optionally, the bottom end 12 of the sampling tank 1 is provided with a release pipeline 7, and the release pipeline 7 is communicated with the sampling tank 1 and is used for releasing seawater in the tank body when the liquid cargo seawater system is deactivated, so that the tank body structure is prevented from being damaged due to freezing of the seawater in the tank body when the ship is sailed in a cold sea area. Optionally, a tank base 8 is further provided on the tank of the sampling tank 1, the tank base 8 being arranged at a position of the tank near the top end 11, the tank base 8 enabling the tank to be arranged at a high level to allow room for the drain line 7 below the tank. Alternatively, the can base 8 may be formed by welding a 10mm thick steel plate to the can, which is required to be cut into a predetermined shape. The medium in the sampling tank 1 is seawater, and has stronger corrosiveness, so that the inner surface and the outer surface of the whole tank body are required to be integrally pickled and hot galvanized after the welding of the whole tank body is finished.
Referring to fig. 1, a main pipe 2 is fixedly disposed at a top end 11 of a sampling tank 1 and is communicated with the sampling tank 1, and the main pipe 2 extends from outside the sampling tank 1 into the sampling tank 1 along a direction from the top end 11 to a bottom end 12. Optionally, the top end 11 of the sampling tank 1 is provided with a through hole through which the main pipe 2 extends into the sampling tank 1. In this embodiment, a through hole is formed in the middle of the blind flange 9 at the top end 11 of the sampling tank 1, the main pipeline 2 extends into the sampling tank 1 through the through hole, and the main pipeline 2 is fixed on the blind flange 9 by welding. Alternatively, the main pipe 2 is a seamless steel pipe having a diameter of 100mm and the through hole has a diameter of 114mm.
In an alternative embodiment, referring to fig. 1 and 2, the line of the main line 2 extending into the sampling tank 1 comprises an extension line 21 and a cap 22. The extension pipe 21 and the cap 22 may be formed by welding. The extension pipe 21 extends from the top end 11 of the sampling tank 1 into the sampling tank 1, and at least one first through hole 211 is arranged on the side wall of the extension pipe 21. Compressed air enters the sample tank 1 from the air inlet end 41, and pressurizes the sample tank 1 through the first through hole 211. The cap 22 is disposed at a port of the extension pipe 21, and the cap 22 is provided with a second through hole 221. The second through hole 221 can also pressurize the sampling tank 1 and can also discharge the liquid into the main pipe 2. Optionally, three first through holes 211 are provided on the extension pipe 21, and the three first through holes 211 are uniformly arranged along the radial direction of the extension pipe 21. On the plane of the radial direction of the extension pipe 21, the connection line of the positions of the three first through holes 211 can form an equilateral triangle, and the positions of the three first through holes 211 are used for quickly and stably pressurizing the tank body. Alternatively, the diameter of the first through hole 211 is 10mm and the diameter of the second through hole 221 is 6mm.
Referring to fig. 1, a gas sensor 3 is connected to a main pipe 2 and contacts gas in the main pipe 2. Alternatively, the gas sensor 3 is provided outside the sampling tank 1 and communicates with the main pipe 2 located outside the sampling tank 1.
Referring to fig. 1 and 3, the first flow path 4 includes an inlet end 41 and an outlet end 42 provided on side walls of the main pipe 2, respectively, and gas flows along the inlet end 41 to the outlet end 42 to form a gas flow path. The height of the inlet end 41 is lower than the height of the outlet end 42 in the direction from the bottom end 12 to the top end 11. Alternatively, the intake end 41 may be connected to a ship's compressed air system. The port of the air inlet end 41 may be provided as a threaded joint. Compressed air of the ship compressed air system enters the inside of the main pipeline 2 through the threaded joint and flows out of the air outlet end 42, a gas environment is formed in the inside of the main pipeline 2, and the gas sensor 3 mounted on the top of the sampling tank 1 is guaranteed not to be immersed by seawater. The outlet end 42 of the compressed air line is disposed 3m from the inlet and outlet vents of the tunnel and cabin as required by the specifications of the classification society to prevent the possibility of hazardous gases from being contained in the outlet line 52. Alternatively, the outlet end 42 may be provided with a blind flange.
Referring to fig. 1 and 3, a second flow path 5 is provided at a side of the sampling tank 1 near the bottom end 12, the second flow path 5 including an inlet pipe 51 and an outlet pipe 52 provided on side walls of the sampling tank 1, respectively, and liquid flows along the inlet pipe 51 to the outlet pipe 52 to form a liquid flow path. The height of the inlet line 51 is higher than the height of the outlet line 52 in the direction from the bottom end 12 to the top end 11. Optionally, an inlet pipe branch 511 is further disposed on the inlet pipe 51, and a blind flange is mounted on the inlet pipe branch 511, so that the internal liquid medium is purged and dried by compressed air during subsequent tank maintenance. The outlet line 52 is provided with an outlet line branch 521. A manual ball valve is provided on the outlet line branch 521 for the deflation of the outlet line 52 at the time of initial use.
Optionally, a first view mirror 61 and a second view mirror 62 are further disposed on the side wall of the sampling tank 1, and the height of the first view mirror 61 in the direction from the bottom end 12 to the top end 11 is the same as the height of the cap 22 in the direction from the bottom end 12 to the top end 11. The second view mirror 62 is disposed below the inlet line 51. Compressed air enters the sampling tank 1 from the air inlet end 41 and pressurizes the tank through the first through hole 211. By observing the first sight glass 61, the pressure of the compressed air flowing into the tank is regulated so that the liquid cargo seawater reaches an appropriate level in the sampling tank 1.
Example 2
The present embodiment also provides a gas detection method using the gas detection apparatus described in embodiment 1. Referring to fig. 1 to 3, the gas detection method includes:
s1: compressed air is introduced into the first flow path 4, so that the compressed air enters the sampling tank 1 through the main pipeline 2, and a liquid medium is introduced into the second flow path 5, so that the liquid medium enters the sampling tank 1 through the inlet pipeline 51;
compressed air of the ship compressed air system enters the main pipeline 2 in the top of the sampling tank 1 from the inlet pipeline 51, and is pressurized into the tank through three first through holes 211. Seawater in the lower part of the sampling tank 1 flows into the tank body from an inlet pipeline 51 and flows out from an outlet pipeline 52.
S2: when the liquid level of the liquid medium rises to the port of the main pipeline 2 in the sampling tank 1, controlling the inlet pressure of the compressed air to be larger than the inlet pressure of the liquid medium, so that the liquid level of the liquid medium is always below the port of the main pipeline 2 in the sampling tank 1;
the liquid level of the first sight glass 61 is observed to determine whether the pressure balance of the compressed air and the liquid cargo seawater in the sampling tank 1 reaches the requirement. When the level of the liquid cargo seawater in the tank reaches the position of the first sight glass 61, it is indicated that the three first through holes 211 have been submerged in the seawater, and that the gas dissipated by the seawater cannot be detected by the gas sensor 3, at which time the pressure of the incoming compressed air can be increased appropriately to lower the seawater level below the first sight glass 61. Alternatively, the compressed air is at a pressure of 7barg and the liquefied seawater is at a pressure of about 0.2 to 0.3barg.
S3: after the internal pressure of the sampling tank 1 reaches equilibrium, the gas sensor 3 is adopted to detect the gas component emitted from the liquid medium in the sampling tank 1 into the main pipeline 2.
After the pressure in the tank body reaches equilibrium, the gas dissipated in the seawater enters the internal pipeline through the first through hole 211 and is detected by the gas sensor 3, and whether the heat exchanger of the liquefied gas carrier leaks is judged according to the detection result of the gas sensor 3. If the liquid cargo sea water contains combustible gas, the gas sensor 3 gives out audible and visual alarm through the liquid cargo control system.
Example 3
The embodiment also provides a gas detection system which is arranged in the liquid cargo gas ship. The gas detection system comprises a heat exchange medium supply pipeline, a liquid cargo tank, a heat exchange medium discharge pipeline and a gas detection device. Wherein, liquid cargo is deposited in the liquid cargo tank, is provided with heat transfer device in the liquid cargo tank, and heat transfer device's entrance point is linked together with the heat transfer medium and provides the pipeline to liquid in the liquid cargo tank is heated into gas through the heat transfer medium. The outlet end of the heat exchange device is communicated with a heat exchange medium discharge pipeline. The inlet pipeline of the gas detection device is communicated with the heat exchange medium discharge pipeline so as to facilitate the gas sensor in the gas detection device to detect the gas emitted in the heat exchange medium, and the gas detection device is the gas detection device described in the embodiment 1.
In summary, the inflatable liquid cargo seawater sampling tank of the gas detection device ensures that the compressed air and the liquid cargo seawater are balanced in the sampling tank by filling the compressed air in the sampling tank, thereby avoiding the reduction of service life and detection failure caused by the submergence of the gas sensor in the seawater, prolonging the service life of the sensor and improving the detection effectiveness.
The above embodiments are merely illustrative of the principles of the present application and its effectiveness, and are not intended to limit the application. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the application. Accordingly, it is intended that all equivalent modifications and variations of the application be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (13)
1. A gas detection apparatus, comprising:
the sampling tank comprises a top end and a bottom end which are oppositely arranged;
the main pipeline is fixedly arranged at the top end of the sampling tank and is communicated with the sampling tank, and the main pipeline extends out of the sampling tank to the inside of the sampling tank along the direction from the top end to the bottom end;
the gas sensor is connected with the main pipeline and is in contact with gas in the main pipeline;
the first flow path comprises an air inlet end and an air outlet end which are respectively arranged on the side wall of the main pipeline, and air flows along the air inlet end to the air outlet end so as to form an air flow path;
the second flow path is arranged on one side of the sampling tank, which is close to the bottom end, and comprises an inlet pipeline and an outlet pipeline which are respectively arranged on the side wall of the sampling tank, and liquid circulates along the inlet pipeline to the outlet pipeline so as to form a liquid flow path.
2. A gas detection apparatus according to claim 1, wherein the inlet conduit is higher in height than the outlet conduit in the bottom-to-top direction.
3. The gas detection apparatus according to claim 2, wherein the height of the gas inlet end is lower than the height of the gas outlet end in a bottom-to-top direction.
4. A gas detection apparatus according to claim 3, wherein the conduit extending from the main conduit into the sampling tank comprises:
the extension pipeline extends into the sampling tank from the top end of the sampling tank, and is provided with at least one first through hole;
the pipe cap is arranged at the port of the extension pipeline, and a second through hole is formed in the pipe cap.
5. The gas detection apparatus according to claim 4, wherein three first through holes are provided on the extension pipe, and the three first through holes are uniformly arranged in a radial direction of the extension pipe.
6. The gas detection device of claim 4, wherein a first flow mirror is further disposed on a sidewall of the sampling tank, and a height of the first flow mirror in a direction from the bottom end to the top end is the same as a height of the cap in a direction from the bottom end to the top end.
7. The gas detection apparatus according to claim 1, wherein the inlet pipe is provided with an inlet pipe branch, and the outlet pipe is provided with an outlet pipe branch.
8. A gas detection apparatus according to claim 7, wherein the outlet conduit branch is provided with a manual ball valve.
9. The gas detection apparatus according to claim 1, wherein a bleed line is provided on a bottom end of the sampling tank, the bleed line being in communication with the sampling tank.
10. The gas detection apparatus according to claim 1, wherein the inlet line is in communication with a heat exchange line of a heat exchanger of the liquefied gas carrier, the heat exchange line being in fluid communication with a liquid medium.
11. A gas detection method, characterized in that the gas detection method is performed using the gas detection apparatus according to any one of claims 1 to 10, the gas detection method comprising:
introducing compressed air into the first circulation path, so that the compressed air enters the sampling tank through the main pipeline, and introducing liquid medium into the second circulation path, so that the liquid medium enters the sampling tank through the inlet pipeline;
when the liquid level of the liquid medium rises to the port of the main pipeline in the sampling tank, controlling the inlet pressure of the compressed air to be larger than the inlet pressure of the liquid medium, so that the liquid level of the liquid medium is always below the port of the main pipeline in the sampling tank;
after the internal pressure of the sampling tank reaches equilibrium, a gas sensor is adopted to detect the gas component emitted from the liquid medium in the sampling tank into the main pipeline.
12. The gas detection method according to claim 11, further comprising, after the step of detecting the gas component emitted from the liquid in the sampling tank into the main pipe by the gas sensor:
judging whether the heat exchanger of the liquefied gas carrier leaks according to the detection result of the gas sensor.
13. A gas detection system, comprising:
a heat exchange medium supply line;
the liquid cargo tank is internally provided with a heat exchange device, and the heat exchange device is communicated with the heat exchange medium supply pipeline and heats liquid in the liquid cargo tank into gas through the heat exchange medium;
the heat exchange medium discharge pipeline is communicated with the heat exchange device;
the inlet pipeline of the gas detection device is communicated with the heat exchange medium discharge pipeline so as to facilitate a gas sensor in the gas detection device to detect gas emitted in the heat exchange medium, and the gas detection device is a gas detection device according to any one of claims 1-10.
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| CN202310172456.5A CN116878779A (en) | 2023-02-24 | 2023-02-24 | Gas detection device, gas detection method and gas detection system |
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| CN202310172456.5A CN116878779A (en) | 2023-02-24 | 2023-02-24 | Gas detection device, gas detection method and gas detection system |
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| CN202310172456.5A Pending CN116878779A (en) | 2023-02-24 | 2023-02-24 | Gas detection device, gas detection method and gas detection system |
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