CN113687020B - LNG ship low-temperature pipeline inert gas filling detection device and detection method thereof - Google Patents
LNG ship low-temperature pipeline inert gas filling detection device and detection method thereof Download PDFInfo
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- CN113687020B CN113687020B CN202110743136.1A CN202110743136A CN113687020B CN 113687020 B CN113687020 B CN 113687020B CN 202110743136 A CN202110743136 A CN 202110743136A CN 113687020 B CN113687020 B CN 113687020B
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- 238000001514 detection method Methods 0.000 title claims abstract description 80
- 239000011261 inert gas Substances 0.000 title claims abstract description 68
- 239000007789 gas Substances 0.000 claims abstract description 159
- 238000003466 welding Methods 0.000 claims abstract description 67
- 238000007789 sealing Methods 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000005070 sampling Methods 0.000 claims abstract description 20
- 230000003014 reinforcing effect Effects 0.000 claims description 36
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 21
- 239000001301 oxygen Substances 0.000 claims description 21
- 229910052760 oxygen Inorganic materials 0.000 claims description 21
- 230000009471 action Effects 0.000 claims description 7
- 239000002390 adhesive tape Substances 0.000 claims description 7
- 239000012774 insulation material Substances 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 16
- 239000003949 liquefied natural gas Substances 0.000 description 14
- 239000007921 spray Substances 0.000 description 7
- 238000005452 bending Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
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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
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Chemical & Material Sciences (AREA)
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- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Combustion & Propulsion (AREA)
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- General Health & Medical Sciences (AREA)
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Abstract
The invention discloses an inert gas filling detection device for a low-temperature pipeline of an LNG ship, which comprises a sealing device and a gas detection module; the sealing device comprises a sponge body and a reversing valve, wherein a sampling port is formed in the sponge body, the reversing valve comprises a valve body, a first air inlet valve cavity, a second air inlet valve cavity, an air outlet valve cavity and a connecting runner are formed in the valve body, the first air inlet valve cavity, the second air inlet valve cavity and the air outlet valve cavity are communicated through the connecting runner, a switch valve group is arranged in each of the first air inlet valve cavity, the second air inlet valve cavity and the air outlet valve cavity, and a limiting assembly is further arranged in each of the first air inlet valve cavities. According to the invention, the low-temperature pipeline can be plugged, so that inert gas is introduced into the low-temperature pipeline, and in the process of introducing the inert gas, the reversing valve can timely switch the air inlet valve cavity according to the gas flow, so that residual air in the low-temperature pipeline is completely discharged, the welding seam is prevented from being oxidized in the welding process, and the welding quality is effectively ensured.
Description
Technical Field
The invention relates to the technical field of ship construction, in particular to a detection device and a detection method for inert gas filling of a low-temperature pipeline of an LNG ship.
Background
The LNG ship cryogenic pipeline is an important component of the whole cryogenic system, bears the conveying function of liquefied natural gas (-163 ℃ C.), and is horizontally arranged along the deck of the dome of the LNG ship.
The low-temperature pipeline is arranged in a mode of sequentially connecting from the head end to the tail end, and the pipe fittings are fixed by adopting an embedded iron spot welding mode.
Because the low-temperature pipeline is made of low-temperature austenitic stainless steel, the low-temperature austenitic stainless steel is extremely easy to oxidize in the welding process, so that welding defects are directly generated, and any tiny defect can cause the low-temperature pipeline to crack and cause natural gas leakage in the using process, so that the generated consequences are not considered.
Therefore, before the low-temperature pipeline is welded, a sealing tool such as sponge is required to be arranged at a certain distance behind the welding line to seal the pipeline, and inert gas is filled into the pipeline from the end part of the pipeline after the sealing is finished (namely, the pipeline is inertized for short). The inert gas in the low-temperature pipeline generally selects argon with larger specific gravity according to welding requirements, the content of the inert gas is required to reach not less than 98% of standard concentration, and meanwhile, air (oxygen) is discharged from a welding groove gap (a coated adhesive tape is torn open) so as to ensure that welding seams cannot be oxidized in the welding process, as shown in fig. 8.
At present, when a pipeline is inerted, whether the pipeline is inerted or not is judged by measuring the oxygen content in air discharged from a weld groove gap, and when the oxygen content is detected to be less than 2% by an oxygen meter, welding operation can be performed. The continuous supply of inert gas is required during the welding process to maintain the inert gas content inside the pipe. However, because DN is greater than or equal to 300 mm's low temperature pipeline length is longer, and pipeline system arrangement (branch pipe, equipment interface) and pipeline trend (do not bend about ), the inside air of unable quick exhaust pipeline of actual inflation in-process and residual air, the inside some air that can remain of accumulation of pipeline, residual air is concentrated between welding seam and sealed frock along with the inflation mainly, as shown in FIG. 9, because residual air can't discharge, consequently the inert gas content of welding seam position department can not guarantee, can influence the production progress greatly. Meanwhile, residual air cannot be discharged, so that the quality of the welding seam can be directly influenced along with continuous spreading of inert gas to the position of the welding seam in the welding process.
Disclosure of Invention
In view of the above, the present invention provides a device and a method for detecting inert gas filling in a low-temperature pipeline of an LNG ship, which are used for solving the problems in the prior art.
An inert gas filling detection device for a low-temperature pipeline of an LNG ship comprises a sealing device and a gas detection module;
the sealing device is used for plugging the low-temperature pipeline and comprises a sponge body and a reversing valve, a sampling port is arranged on the sponge body,
the reversing valve comprises a valve body, a first air inlet valve cavity, a second air inlet valve cavity, an air outlet valve cavity and a connecting runner are arranged in the valve body, the first air inlet valve cavity, the second air inlet valve cavity and the air outlet valve cavity are communicated through the connecting runner, switch valve groups are arranged in the first air inlet valve cavity, the second air inlet valve cavity and the air outlet valve cavity, and a limiting assembly used for enabling an air inlet of the valve cavity to be kept in a normally open state is further arranged in the first air inlet valve cavity;
the first air inlet valve cavity and the second air inlet valve cavity of the reversing valve are respectively connected with a sampling port on the sponge body through an air inlet pipe, and the air outlet valve cavity is connected with the air detection module through an air outlet pipe;
when the flow rate of the inert gas introduced into the low-temperature pipeline is in a first set flow rate range, the gas flows to the gas outlet pipe along the first gas inlet valve cavity, the connecting flow channel and the gas outlet valve cavity of the reversing valve, and flows into the gas detection module through the gas outlet pipe;
when the flow rate of the inert gas introduced into the low-temperature pipeline is increased to be within a second set flow rate range, the switch valve groups in the first air inlet valve cavity and the second air inlet valve cavity move towards the air outlets of the valve cavities under the action of the gas pressure, so that the air outlet of the valve cavity of the first air inlet valve cavity is closed, the air inlet of the valve cavity of the second air inlet valve cavity is opened, the gas flows to the air outlet pipe along the second air inlet valve cavity, the connecting flow channel and the air outlet valve cavity, and flows into the gas detection module through the air outlet pipe.
Preferably, the sealing device is further provided with a traction reinforcing component, the traction reinforcing component comprises a reinforcing support, traction ropes and a connecting joint, the reinforcing support is embedded in the sponge body, two end parts of the reinforcing support extend out of the side face of the sponge body and are respectively fixed with one traction rope, the two traction ropes are intersected and fixed on the connecting joint, one end of the connecting joint is connected with an air outlet valve cavity of the reversing valve through an air outlet pipe, and the other end of the connecting joint is connected with the air detection module through an air pipe.
Preferably, the gas detection module comprises a detection joint, a filter, a gas flowmeter, a gas detection device and a spray pipe which are sequentially arranged along a gas flow path, wherein the detection joint, the filter, the gas flowmeter, the gas detection device and the spray pipe are connected through a gas pipe, and the detection joint is connected with a reversing valve or a connecting joint of the traction reinforcing assembly through the gas pipe.
Preferably, sealing seats are further arranged between contact positions of the switch valve groups in the first air inlet valve cavity, the second air inlet valve cavity and the air outlet valve cavity and the respective valve cavities.
Preferably, the switch valve groups in the first air inlet valve cavity, the second air inlet valve cavity and the air outlet valve cavity have the same structure and comprise springs and valve cores fixedly connected with the springs;
the spring elasticity in the first air inlet valve cavity is smaller than the spring elasticity in the second air inlet valve cavity, and the spring elasticity in the air outlet valve cavity is equal to the spring elasticity in the first air inlet valve cavity.
Preferably, the limiting assembly comprises a limiting seat fixedly connected with the valve body, a threaded seat fixed in the limiting seat and an adjusting rod fixed in the threaded seat, wherein the bottom of the adjusting rod extends out of the threaded seat and abuts against the switch valve group of the first air inlet valve cavity.
Preferably, the limiting seat comprises a tubular seat body and seat rings uniformly arranged in the tubular seat body, and the seat rings are arranged along the radial direction of the tubular seat body.
Preferably, the sponge body is further wrapped with a layer of sealing insulating material.
The detection method of the LNG ship low-temperature pipeline inert gas filling detection device specifically comprises the following steps:
s1, debugging a reversing valve to ensure that each valve cavity can be normally opened and closed in a corresponding flow range;
s2, presetting a sealing device behind one welding line in the low-temperature pipeline, and keeping a sampling port on the sponge body horizontal;
s3, filling inert gas into the pipeline from the gas inlet of the low-temperature pipeline, and wrapping the welding groove by using an adhesive tape and sealing when the oxygen concentration in the gas discharged from the welding seam is not more than 2% by using an oxygen meter;
s4, continuously filling inert gas into the low-temperature pipeline, when the flow rate of the introduced inert gas is within a second set flow rate range, opening a second air inlet valve cavity and an air outlet valve cavity of the reversing valve, closing a first air inlet valve cavity, and enabling the gas to flow to an air outlet pipe along the first air inlet valve cavity, the connecting flow channel and the air outlet valve cavity of the reversing valve, flowing into a gas detection module through the air outlet pipe, detecting the oxygen concentration in the gas through a gas detection device, and ensuring that most residual air is exhausted;
s5, reducing the flow rate of the inert gas, when the flow rate of the inert gas is in a first set flow rate range, closing a second air inlet valve cavity of the reversing valve, opening a first air inlet valve cavity and an air outlet valve cavity, enabling the gas to flow to an air outlet pipe along the first air inlet valve cavity, a connecting flow channel and the air outlet valve cavity of the reversing valve, enabling the gas to flow into a gas detection module through the air outlet pipe, and when the gas detection device detects that the oxygen concentration in the gas is zero, starting welding work, wherein the flow rate of the inert gas is maintained at the current flow rate during welding.
Preferably, step 5 is followed by step 6: and (3) traction and movement of the sealing device to the rear of the next welding line by utilizing the traction reinforcing assembly, and then repeating the steps (3), 4 and 5 until the welding of the welding line is completed.
The beneficial effects of the invention are as follows:
according to the invention, the low-temperature pipeline can be plugged, so that inert gas is conveniently introduced into the low-temperature pipeline, and in the process of introducing the inert gas, the reversing valve can timely switch the air inlet valve cavity according to the gas flow so as to completely discharge residual air in the low-temperature pipeline, and meanwhile, the content of the inert gas in the low-temperature pipeline in the welding process can be controlled, so that the oxidation of a welding line in the welding process is avoided, and the welding quality is effectively ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a reversing valve.
Fig. 2 is a schematic structural view of the spacing assembly.
FIG. 3 is a schematic illustration of the positioning assembly installed in the first air intake valve cavity.
FIG. 4 is a schematic illustration of the on-off state of the valve chambers inside the present invention prior to use.
Fig. 5 is a schematic illustration of gas flow from the first inlet valve chamber into the reversing valve within a first set flow range.
Fig. 6 is a schematic illustration of gas flow from the second inlet valve chamber into the reversing valve within a second set flow range.
Fig. 7 is a schematic view of one of the structures of the seal holder.
Fig. 8 and 9 are schematic views of the air discharge inside the pipeline in the background art.
Fig. 10 is a schematic view of the structure of the sealing device of the present invention.
Fig. 11 is a cross-sectional view of the sponge body C-C of fig. 10.
Fig. 12 is a view in the direction a in fig. 10.
Fig. 13 is a schematic view of the installation of the seal of the present invention in a cryogenic pipeline.
FIG. 14 is a schematic view of a pulling force applied to a seal to move it to the next weld.
Fig. 15 is a schematic view of the friction force applied during the movement of the sponge body.
Fig. 16 is a schematic view of elastic deformation of the sponge body during movement.
FIG. 17 is a schematic diagram of the structure of the detecting device of the present invention.
Fig. 18 is a schematic structural view of the spout.
The meaning of the reference numerals in the figures is:
1 is a valve body, 2 is a first air inlet valve cavity, 3 is a second air inlet valve cavity, 4 is an air outlet valve cavity, 5 is a connecting flow channel, 6 is a switch valve group, 7 is a spring, 8 is a valve core, 9 is a limit component, 10 is a limit seat, 11 is a thread seat, 12 is an adjusting rod, 13 is a tubular seat body, 14 is a seat ring, 15 is a seal seat, 16 is an air inlet pipe, 17 is an air outlet pipe, 18 is a welding seam, 19 is inert gas, 20 is air, 21 is a sponge plug,
the low-temperature pipeline is characterized in that the low-temperature pipeline is a low-temperature pipeline 22, the sponge body is a low-temperature pipeline 23, the reversing valve is a reversing valve 25, the sampling port is a reinforcing support 26, the hauling rope is a hauling rope 27, the connecting joint is a connecting joint 29, the pressureless bubble is a sealing insulating material 30, the detecting joint is a detecting joint 31, the filter is a filter 32, the gas flowmeter is a gas flowmeter 33, the gas detecting device is a gas detecting device 34, the spray pipe is a spray pipe 35, the main pipeline is 36, the branch pipeline is 37, and the expander is 38.
Detailed Description
For a better understanding of the technical solution of the present invention, the following detailed description of the embodiments of the present invention refers to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present application is described in further detail below by way of specific embodiments and with reference to the accompanying drawings.
In the description of the present application, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" means two or more, unless specified or indicated otherwise; the terms "coupled," "secured," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, it should be understood that the terms "upper," "lower," "left," "right," and the like in the embodiments of the present application are described in terms of angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In the context of this document, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on the other element or be indirectly on the other element through intervening elements.
In a first embodiment, the invention provides an inert gas filling detection device for a low-temperature pipeline of an LNG ship, which comprises a sealing device and a gas detection module.
The sealing device is used for being arranged behind the welding line of the low-temperature pipeline 22 to seal the pipeline, and air in the pipeline can be discharged by filling inert gas into the end part of the pipeline, so that the residual part of air in the low-temperature pipeline 22 is avoided, and the welding quality of the welding line is prevented from being influenced.
The sealing means comprises a sponge body 23 and a reversing valve 24.
The sponge body 23 is used for plugging the low-temperature pipeline 22, is of a truncated cone-shaped structure, and has an oval end face facing the welding line 18 and a round end face facing away from the welding line 18. Two sampling ports 25 are arranged on the sponge body 23, and two sampling ports 26 are arranged on the end face of the sponge body 23 facing the welding line 18 side along the vertical direction up and down. The gas inside the cryogenic line 22 may enter the reversing valve 24 through the sampling port 26.
In the embodiment, the diameter D of the end face of the sponge body 23 on the side away from the welding line 18 is 1.1D, and D is the inner diameter of the low-temperature pipeline; the long axis of the end face of the sponge body 23 facing the weld 18 side is 1.1-1.2D, and the long axis is D; the thickness of the sponge body 23 is 1/3 to 1/4D. The sponge body 23 is made of a material with fatigue performance meeting the requirements of GB/T10802-2006, and preferably, PU polyurethane sponge is selected.
The reversing valve 24 comprises a valve body 1, a first air inlet valve cavity 2, a second air inlet valve cavity 3, an air outlet valve cavity 4 and a connecting runner 5 are arranged in the valve body, the first air inlet valve cavity 2, the second air inlet valve cavity 3 and the air outlet valve cavity 4 are communicated through the connecting runner 5, the first air inlet valve cavity 2 and the second air inlet valve cavity 3 are connected with a sampling port 25 on the sponge body through an air inlet pipe 16, and the air outlet valve cavity 4 is connected with the gas detection module through an air outlet pipe 17.
The first air inlet valve cavity 2, the second air inlet valve cavity 3 and the air outlet valve cavity 4 are respectively provided with a switch valve group 6. The switch valve groups 6 in the three valve cavities have the same structure and comprise springs 7 and valve cores 8 fixedly connected with the springs 7, and the springs in each valve cavity are fixed on steps at the air outlets of the respective valve cavities.
In this embodiment, the spring elasticity in the first air inlet valve chamber 2 is smaller than the spring elasticity in the second air inlet valve chamber 3, and the spring elasticity in the air outlet valve chamber 4 is equal to the spring elasticity in the first air inlet valve chamber 2.
And a limiting assembly 9 for keeping the valve cavity air inlet in a normally open state is also arranged in the first air inlet valve cavity 2. The limiting component 9 not only has the function of keeping the valve cavity air inlet of the first air inlet valve cavity 2 normally open, but also has the function of adjusting the maximum flow which can be born by the switch valve group in the first air inlet valve cavity 2.
Specifically, the limiting assembly 9 comprises a limiting seat 10 fixedly connected with the valve body 1, a threaded seat 11 fixed in the limiting seat 10, and an adjusting rod 12 fixed in the threaded seat 11, wherein the bottom of the adjusting rod 12 extends out of the threaded seat 11 and abuts against the switch valve group of the first air inlet valve cavity 2. In this embodiment, the limiting seat 10 comprises a tubular seat body 13, and seat rings 14 uniformly arranged in the tubular seat body 13, wherein the seat rings 14 are arranged along the radial direction of the tubular seat body 13; the adjusting rod 12 is a screw with a straight slot at the top.
When the valve of the invention is used for a long time, the spring in the first air inlet valve cavity 2 can be tired, so that the on-off accuracy of the valve is affected. For example, when the valve is initially used, the maximum flow threshold value which can be born by the switch valve group in the first air inlet valve cavity 2 is 10L/min, when the gas flow is smaller than 10L/min, the first air inlet valve cavity 2 is communicated for a long time, and when the gas flow is larger than 10L/min, the first air inlet valve cavity 2 is closed; if the valve is used for a long time, the fatigue phenomenon of the spring is likely to occur, and the phenomenon that the first air inlet valve cavity 2 is closed in advance when the air flow rate is not 10L/min is likely to occur, so that the exhaust effect of residual air in the low-temperature pipeline is affected, and at the moment, the maximum flow rate threshold value which can be born by the switch valve group can be readjusted to be 10L/min by screwing the adjusting rod 12.
Preferably, a sealing seat 15 is further arranged between contact parts of the switch valve groups in the first air inlet valve cavity 2, the second air inlet valve cavity 3 and the air outlet valve cavity 4 and the respective valve cavities. In this embodiment, the seal seat 15 is a seal ring (as shown in fig. 7) disposed at the air inlet and the air outlet of the valve cavity, or a seal gasket (as shown in fig. 1) that is adhered and fixed on the inner wall of the valve cavity and matches the shape of the inner wall of the valve cavity.
Before the reversing valve is used, the first air inlet valve cavity 2 is kept in a normally open state under the action of the limiting assembly 9, and the second air inlet valve cavity 3 and the air outlet valve cavity 4 are kept in a normally closed state, as shown in fig. 4. When the first air inlet valve cavity 2 is kept in a normally open state, the air inlet of the valve cavity is opened. When the second air inlet valve cavity 3 and the air outlet valve cavity 4 are kept in a normally closed state, the respective valve cores of the second air inlet valve cavity and the air outlet valve cavity respectively prop against the valve body at the air inlet of the valve cavity, so that the air inlet of the valve cavity is kept closed.
When the gas flow is in the first set flow range, since the first gas inlet valve cavity 2 is normally open, the gas enters the connecting flow passage 5 along the first gas inlet valve cavity 2 and flows to the valve cavity gas inlet of the gas outlet valve cavity 4 along the connecting flow passage 5, the gas pushes the valve core in the gas outlet valve cavity 4 to move rightward to compress the spring thereof, the valve cavity gas inlet of the gas outlet valve cavity 4 is opened, so that the gas flows out of the valve body, and the gas flows into the gas detection module through the gas outlet pipe, as shown in fig. 5.
When the gas flow rate is increased to be within a second set flow rate range, the switch valve groups in the first gas inlet valve cavity 2 and the second gas inlet valve cavity 3 move towards the gas outlet of the respective valve cavities under the action of the gas pressure, in the process, the gas flow pushes the valve core of the second gas inlet valve cavity 3 to move upwards from the valve cavity gas inlet of the second gas inlet valve cavity to compress the spring of the valve core, the valve cavity gas inlet of the second gas inlet valve cavity 3 is opened, and the gas flows into the connecting flow channel; meanwhile, at the moment of introducing the gas, the first gas inlet valve cavity 2 is opened, so that the gas also enters the first gas inlet valve cavity 2, and at the moment, the gas flow is overlarge and is larger than the maximum flow threshold value which can be born by the switch valve group in the first gas inlet valve cavity 2, so that the gas can press the valve core of the first gas inlet valve cavity 2 to move downwards to compress the spring, and the valve core is clamped at the gas outlet of the valve cavity, so that the gas outlet of the valve cavity of the first gas inlet valve cavity 2 is closed. The gas entering the connecting flow passage 5 flows to the valve cavity air inlet of the air outlet valve cavity 4 along the connecting flow passage 5, the gas pushes the valve core in the air outlet valve cavity 4 to move rightwards to compress the spring of the valve core, the valve cavity air inlet of the air outlet valve cavity 4 is opened, so that the gas flows out of the valve body, and the gas flows into the gas detection module through the air outlet pipe, as shown in fig. 6.
The gas detection module is used for detecting the oxygen content in the gas discharged from the reversing valve 24 so as to judge whether the residual gas in the low-temperature pipeline 22 is completely discharged.
The gas detection module comprises a detection joint 31, a filter 32, a gas flowmeter 33, a gas detection device 34 and a spray pipe 35 which are sequentially arranged along a gas flow path, wherein the detection joint 31, the filter 32, the gas flowmeter 33, the gas detection device 34 and the spray pipe 35 are connected through a gas pipe, and a ball valve is arranged on the gas pipe. The check connector 31 is connected to the reversing valve 24.
In this embodiment, the filter 32 is an atomizing filter for atomizing the gas to be detected, so as to ensure the uniformity of the gas concentration for the subsequent detection by the gas flowmeter and the gas detecting device.
The gas flow meter 33 preferably uses a flow meter having a measuring range of 0 to 30L/min for detecting the gas flow rate in the upper and lower sampling ports of the sponge main body 23.
The gas detection device 34 has both inert gas and oxygen detection modes, ensuring that changes in the two gas contents can be detected.
The spray pipe 35 is composed of a main pipeline 36, a branch pipeline 37 and an expander 38, wherein the main pipeline 36 is connected with an air outlet of the air detection device 34, the branch pipeline 37 is obliquely fixed on the main pipeline 36, an included angle between the branch pipeline 37 and the main pipeline 36 is 60 degrees, and compressed air can be introduced into the branch pipeline 37. The expander 38 ensures rapid diffusion of the gas containing the IG inert gas into the atmosphere.
The invention discloses a detection method for filling inert gas into a low-temperature pipeline of an LNG ship, which comprises the following steps:
step 1, assembling an inert gas filling detection device for the LNG ship low-temperature pipeline: the sponge body 23, the reversing valve 24 and the traction reinforcing component are assembled into a whole, namely, the reinforcing bracket 26 is embedded in the sponge body 23, the air inlet pipe 16 is respectively connected with the reversing valve 24 and the sampling port 25 of the sponge body 23, the reversing valve 24 is arranged in the center of the end face of the sponge body 23, which faces one side of the welding seam 18, and the reversing valve 24 and the air inlet pipe 16 are bound and fixed with the sponge body 23 into a whole through adhesive tapes. Then, the outlet pipe on the reversing valve 24 is connected with the detection joint on the gas detection module.
Compressed air with flow rates of 5-10L/min, 15-10L/min and 0L/min is respectively introduced into the reversing valve, and the reversing valve is adjusted to ensure that each valve cavity can be normally opened and closed in a corresponding flow range.
Step 2, the staff gets into low temperature pipeline 22, through extrusion sponge body 23 both sides, presets the sealing device of this application at a certain welding seam rear in the pipeline (as shown in fig. 13) to ensure that upper and lower two sampling ports 25 are arranged along the vertical direction, observe sponge body 23 and pipeline inner wall whether laminate sealedly, whether the levelness through pressureless bubble 29 inspection sampling port 25 satisfies the requirement simultaneously.
And 3, filling inert gas into the low-temperature pipeline 22 from the air inlet, and coating the groove of the welding seam 18 by using an adhesive tape and sealing when the oxygen concentration in the gas discharged from the groove of the welding seam 18 is not more than 2% by using an oxygen meter.
And 4, filling inert gas with the flow rate of 15-20L/min from the air inlet of the low-temperature pipeline 22 into the pipeline, wherein at the moment, the air inlet of the valve cavity of the second air inlet valve cavity 3 is opened, the air outlet of the valve cavity of the first air inlet valve cavity 2 is closed, the gas flows out of the valve body from the second air inlet valve cavity 3, the connecting flow passage 5 and the air outlet valve cavity 4, flows into the gas detection module through the air outlet pipe, so that residual air in the pipeline is discharged, and the content of the discharged gas is detected through the gas detection device, so that most of the residual air is ensured to be discharged. The inflation time can be reduced and the inflation efficiency can be improved by filling the inert gas with the flow of 15-20L/min into the pipeline.
In step 5, although most of the residual air has been exhausted, a small amount of residual air is accumulated above the inside of the pipeline due to the lighter specific gravity of the air. Therefore, after the inert gas with the flow of 15-20L/min is introduced for a period of time, the flow of the inert gas can be adjusted to 5-10L/min, at the moment, because the flow is reduced, under the action of the elasticity of a spring, the valve core of the second air inlet valve cavity 3 moves downwards to close the air inlet of the valve cavity, the valve core of the second air inlet valve cavity 3 moves upwards to open the air outlet of the valve cavity, and the gas flows out of the valve body from the first air inlet valve cavity 2, the connecting flow channel 5 and the air outlet valve cavity 4 and flows into the gas detection module through the air outlet pipe 17, so that residual air accumulated above the pipeline is discharged. When the gas detection device detects that the oxygen content in the exhausted gas returns to zero, the residual air is completely exhausted out of the pipeline, and the pipeline weld joint has welding conditions at the moment, so that the welding work can be started.
In the pipeline welding process, in order to ensure that the content of inert gas in the pipeline is always maintained at the standard concentration, the first air inlet valve cavity 2 can be kept normally open, namely the inert gas filling flow is maintained at 5-10L/min.
In the second embodiment, the device for detecting the inert gas filling in the LNG ship cryogenic pipeline according to the present embodiment is substantially the same as that in the first embodiment, and specifically, the difference is that a traction reinforcing assembly is further provided on the sealing device, and the traction reinforcing assembly includes a reinforcing bracket 26, a traction rope 27 and a connection joint 28.
The reinforcing bracket 26 is embedded in the sponge body 23, two end parts of the reinforcing bracket extend out of the side surface of the sponge body 23 and are respectively fixed with one traction rope 27, and the two traction ropes 27 are intersected and fixed on the connecting joint 28.
In this embodiment, the reinforcing bracket 26 is a U-shaped plate, the length of the bent edge of which is not less than 2/3 of the thickness of the sponge body 23, and the width of the reinforcing bracket 26 is 1/3 of the thickness of the sponge body 23. The reinforcing bracket 26 is embedded in the sponge body 23, the bending edge of the reinforcing bracket extends out from the end face of the sponge body 23 on the side far away from the welding line 18, a pressureless water bubble 29 can be further installed on the extending part, and the pressureless water bubble 29 is used for measuring the levelness of the sampling port 25 after the installation of the sponge body 23 is completed.
The reinforcing bracket 26 is fixed to the center position inside the sponge body 23 in the vertical line direction. The reinforcing bracket 26 is fixed with a hauling rope 27 from the end of the extending part of the sponge body 23, the upper and lower hauling ropes 27 are fixed on a connecting joint 28 in an intersecting way, and the length of the hauling rope 27 is at least 2 times of the inner diameter of the low-temperature pipeline 22. In use, the upper and lower traction ropes 27 and the reinforcing brackets 26 form a triangular reinforcing protection structure, and the traction reinforcing assembly can also serve as a traction head of the sponge body 23.
Preferably, the sponge body 23 is further wrapped with a layer of sealing insulating material 30 for sealing, insulating and protecting, and avoiding abrasion, heating, wetting or soaking of the sponge body during use.
The method for detecting the filling of inert gas into the low-temperature pipeline of the LNG ship in the embodiment comprises the following steps:
step 1, assembling an inert gas filling detection device for the LNG ship low-temperature pipeline: the sponge body 23, the reversing valve 24 and the traction reinforcing component are assembled into a whole, namely, the reinforcing bracket 26 is embedded in the sponge body 23, the air inlet pipe 16 is respectively connected with the reversing valve 24 and the sampling port 25 of the sponge body 23, the reversing valve 24 is arranged in the center of the end face of the sponge body 23, which faces one side of the welding seam 18, and the reversing valve 24 and the air inlet pipe 16 are bound and fixed with the sponge body 23 into a whole through adhesive tapes. Then, the outlet pipe on the reversing valve 24 is connected with the detection joint on the gas detection module.
Compressed air with flow rates of 5-10L/min, 15-10L/min and 0L/min is respectively introduced into the reversing valve, and the reversing valve is adjusted to ensure that each valve cavity can be normally opened and closed in a corresponding flow range.
Step 2, the staff gets into low temperature pipeline 22, through extrusion sponge body 23 both sides, presets the sealing device of this application at a certain welding seam rear in the pipeline (as shown in fig. 13) to ensure that upper and lower two sampling ports 25 are arranged along the vertical direction, observe sponge body 23 and pipeline inner wall whether laminate sealedly, whether the levelness through pressureless bubble 29 inspection sampling port 25 satisfies the requirement simultaneously.
And 3, filling inert gas into the low-temperature pipeline 22 from the air inlet, and coating the groove of the welding seam 18 by using an adhesive tape and sealing when the oxygen concentration in the gas discharged from the groove of the welding seam 18 is not more than 2% by using an oxygen meter.
And 4, filling inert gas with the flow rate of 15-20L/min from the air inlet of the low-temperature pipeline 22 into the pipeline, wherein at the moment, the air inlet of the valve cavity of the second air inlet valve cavity 3 is opened, the air outlet of the valve cavity of the first air inlet valve cavity 2 is closed, the gas flows out of the valve body from the second air inlet valve cavity 3, the connecting flow passage 5 and the air outlet valve cavity 4, flows into the gas detection module through the air outlet pipe, so that residual air in the pipeline is discharged, and the content of the discharged gas is detected through the gas detection device, so that most of the residual air is ensured to be discharged. The inflation time can be reduced and the inflation efficiency can be improved by filling the inert gas with the flow of 15-20L/min into the pipeline.
In step 5, although most of the residual air has been exhausted, a small amount of residual air is accumulated above the inside of the pipeline due to the lighter specific gravity of the air. Therefore, after the inert gas with the flow of 15-20L/min is introduced for a period of time, the flow of the inert gas can be adjusted to 5-10L/min, at the moment, because the flow is reduced, under the action of the elasticity of a spring, the valve core of the second air inlet valve cavity 3 moves downwards to close the air inlet of the valve cavity, the valve core of the second air inlet valve cavity 3 moves upwards to open the air outlet of the valve cavity, and the gas flows out of the valve body from the first air inlet valve cavity 2, the connecting flow channel 5 and the air outlet valve cavity 4 and flows into the gas detection module through the air outlet pipe 17, so that residual air accumulated above the pipeline is discharged. When the gas detection device detects that the oxygen content in the exhausted gas returns to zero, the residual air is completely exhausted out of the pipeline, and the pipeline weld joint has welding conditions at the moment, so that the welding work can be started.
In the pipeline welding process, in order to ensure that the content of inert gas in the pipeline is always maintained at the standard concentration, the first air inlet valve cavity 2 can be kept normally open, namely the inert gas filling flow is maintained at 5-10L/min.
Step 6, after the welding of the welding seam is completed, the connecting joint 28 is pulled, the sponge body 23 can be driven to move towards the next welding seam by the triangular reinforcing protection structure formed by the connecting joint 28, the traction rope 27 and the reinforcing support 26, at the moment, the tensile force applied to the upper bending part and the lower bending part of the reinforcing support 26 (the tensile force is the same as that applied to the lower bending part F3.2 (as shown in fig. 14) on the F3.2), the friction force between the top and the bottom of the sponge body 23 and the pipe wall is the same, and the situation that the sponge body 23 overturns along the central line of the pipeline can not occur in the moving process of the sponge body 23.
Meanwhile, because the friction force on two sides of the end face (oval end face) of the sponge body 23 facing one side of the welding seam 18 is smaller than the friction force on the top and the bottom of the sponge body (as shown in fig. 15), in the moving process, the parts, attached to the pipe wall, on two sides of the long axis of the end face (oval end face) of the sponge body 23 facing one side of the welding seam are deformed completely (elastically deformed) in a certain radian under the action of a tensile force, and the situation that the sponge body 23 overturns along the left and right directions of a pipeline (as shown in fig. 16) can not occur in the moving process.
After the sealing device is moved to the corresponding position, the traction tension is released, the elastic deformation of the sponge body 23 is recovered, and the sponge body is attached to the pipe wall again to achieve the sealing state.
And then, repeatedly executing the steps until all the welding seams are welded.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (9)
1. The device for detecting the inert gas filling in the low-temperature pipeline of the LNG ship is characterized by comprising a sealing device and a gas detection module;
the sealing device is used for plugging the low-temperature pipeline and comprises a sponge body and a reversing valve, a sampling port is arranged on the sponge body,
the reversing valve comprises a valve body, a first air inlet valve cavity, a second air inlet valve cavity, an air outlet valve cavity and a connecting runner are arranged in the valve body, the first air inlet valve cavity, the second air inlet valve cavity and the air outlet valve cavity are communicated through the connecting runner, switch valve groups are arranged in the first air inlet valve cavity, the second air inlet valve cavity and the air outlet valve cavity, and a limiting assembly used for enabling an air inlet of the valve cavity to be kept in a normally open state is further arranged in the first air inlet valve cavity;
the first air inlet valve cavity and the second air inlet valve cavity of the reversing valve are respectively connected with a sampling port on the sponge body through an air inlet pipe, and the air outlet valve cavity is connected with the air detection module through an air outlet pipe;
sealing seats are arranged between contact parts of the switch valve groups in the first air inlet valve cavity, the second air inlet valve cavity and the air outlet valve cavity and the respective valve cavities; the switch valve groups in the first air inlet valve cavity, the second air inlet valve cavity and the air outlet valve cavity have the same structure and comprise springs and valve cores fixedly connected with the springs;
the gas detection module comprises a gas detection device, wherein the gas detection device detects the oxygen concentration in the gas;
when the flow rate of the inert gas introduced into the low-temperature pipeline is in a first set flow rate range, the gas flows to the gas outlet pipe along the first gas inlet valve cavity, the connecting flow channel and the gas outlet valve cavity of the reversing valve, and flows into the gas detection module through the gas outlet pipe;
when the flow rate of the inert gas introduced into the low-temperature pipeline is increased to be within a second set flow rate range, the switch valve groups in the first air inlet valve cavity and the second air inlet valve cavity move towards the air outlets of the valve cavities under the action of the gas pressure, so that the air outlet of the valve cavity of the first air inlet valve cavity is closed, the air inlet of the valve cavity of the second air inlet valve cavity is opened, the gas flows to the air outlet pipe along the second air inlet valve cavity, the connecting flow channel and the air outlet valve cavity, and flows into the gas detection module through the air outlet pipe.
2. The LNG ship cryogenic pipeline inert gas filling detection device according to claim 1, wherein the sealing device is further provided with a traction reinforcing component, the traction reinforcing component comprises a reinforcing support, traction ropes and a connecting joint, the reinforcing support is embedded in the sponge body, two ends of the reinforcing support extend out of the side face of the sponge body and are respectively fixed with one traction rope, the two traction ropes are intersected and fixed on the connecting joint, one end of the connecting joint is connected with an air outlet valve cavity of the reversing valve through an air outlet pipe, and the other end of the connecting joint is connected with the gas detection module through an air pipe.
3. The LNG ship cryogenic pipeline inert gas filling detection device according to claim 1 or 2, wherein the gas detection module comprises a detection joint, a filter, a gas flowmeter, a gas detection device and a nozzle pipe sequentially arranged along a gas flow path, the detection joint, the filter, the gas flowmeter, the gas detection device and the nozzle pipe are connected through a gas pipe, and the detection joint is connected with a reversing valve or a connection joint of a traction reinforcing assembly through the gas pipe.
4. The LNG ship cryogenic pipeline inert gas filling detection device of claim 1, wherein the spring elasticity in the first air inlet valve chamber is less than the spring elasticity in the second air inlet valve chamber, and the spring elasticity in the air outlet valve chamber is equal to the spring elasticity in the first air inlet valve chamber.
5. The LNG ship cryogenic pipeline inert gas filling detection device according to claim 1, wherein the limit assembly comprises a limit seat fixedly connected with the valve body, a screw seat fixed in the limit seat, and an adjusting rod fixed in the screw seat, the bottom of the adjusting rod extends out of the screw seat and abuts against the valve block of the first air inlet valve cavity.
6. The LNG ship cryogenic pipeline inert gas filling detection device of claim 5, wherein the limiting seat comprises a tubular seat body, seat rings uniformly arranged in the tubular seat body, and the seat rings are arranged along the radial direction of the tubular seat body.
7. The LNG ship cryogenic pipeline inert gas filling detection device of claim 1, wherein the sponge body is further wrapped with a layer of sealing insulation material.
8. A method for detecting the filling of inert gas into a low-temperature pipeline of an LNG ship according to any one of claims 1 to 7, comprising the following steps:
s1, debugging a reversing valve to ensure that each valve cavity can be normally opened and closed in a corresponding flow range;
s2, presetting a sealing device behind one welding line in the low-temperature pipeline, and keeping a sampling port on the sponge body horizontal;
s3, filling inert gas into the pipeline from the gas inlet of the low-temperature pipeline, and wrapping the welding groove by using an adhesive tape and sealing when the oxygen concentration in the gas discharged from the welding seam is not more than 2% by using an oxygen meter;
s4, continuously filling inert gas into the low-temperature pipeline, when the flow rate of the introduced inert gas is within a second set flow rate range, opening a second air inlet valve cavity and an air outlet valve cavity of the reversing valve, closing a first air inlet valve cavity, and enabling the gas to flow to an air outlet pipe along the first air inlet valve cavity, the connecting flow channel and the air outlet valve cavity of the reversing valve, flowing into a gas detection module through the air outlet pipe, detecting the oxygen concentration in the gas through a gas detection device, and ensuring that most residual air is exhausted;
s5, reducing the flow rate of the inert gas, when the flow rate of the inert gas is in a first set flow rate range, closing a second air inlet valve cavity of the reversing valve, opening a first air inlet valve cavity and an air outlet valve cavity, enabling the gas to flow to an air outlet pipe along the first air inlet valve cavity, a connecting flow channel and the air outlet valve cavity of the reversing valve, enabling the gas to flow into a gas detection module through the air outlet pipe, and when the gas detection device detects that the oxygen concentration in the gas is zero, starting welding work, wherein the flow rate of the inert gas is maintained at the current flow rate during welding.
9. The method for detecting the filling of inert gas into the cryogenic pipeline of the LNG carrier according to claim 8, further comprising step 6: and (3) traction and movement of the sealing device to the rear of the next welding line by utilizing the traction reinforcing assembly, and then repeating the steps (3), 4 and 5 until the welding of the welding line is completed.
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