Liquefied natural gas conveying pipeline

Abstract

The utility model discloses a liquefied natural gas conveying pipeline which comprises a first main conveying pipeline, a second main conveying pipeline and an auxiliary conveying pipeline, and a gas outlet of the first main conveying pipeline and a gas inlet of the second main conveying pipeline are both communicated with a tee joint. The output end, in the horizontal direction and the output end, in the vertical direction, of the tee joint connected to an air outlet of the first main conveying pipeline are both connected with block valves. The filter pipes are very convenient to mount and dismount, the filter pipes between the first main conveying pipeline and the second main conveying pipeline and the filter pipes connected with the auxiliary conveying pipeline can be replaced in turn by using the block valves when the filter pipes are replaced, air supply does not need to be stopped, use of a user is not affected, and practicability is high; the filter pipe is good in filter effect and large in filter surface, the filter pipe between the first main conveying pipeline and the second main conveying pipeline is used in cooperation with the filter pipe connected with the auxiliary conveying pipeline, the filter effect is good, and the phenomenon that ventilation is affected when the blocking area of a filter element is too large can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of pipelines, in particular to a liquefied natural gas transmission pipeline. Background Art

[0002] Natural gas pipelines are used to transport natural gas from mining sites or processing plants to users. Using natural gas pipelines to transport natural gas is currently the mainstream way to transport natural gas in large quantities. However, natural gas often contains impurities, so it is necessary to filter the natural gas during pipeline transportation.

[0003] Most of the existing natural gas transmission pipelines lack the filtering function for natural gas, which makes it easy for impurities in natural gas to accumulate on the inner wall of the pipeline, and even cause blockage. The pipeline needs to be cleaned or replaced frequently, which is time-consuming and labor-intensive. In addition, the gas supply needs to be suspended when the pipeline is replaced, which affects the user's use and has low practicality. Although some natural gas transmission pipelines are equipped with filtering devices, the installation process is very troublesome, and the filtering device needs to be cleaned regularly. The gas supply also needs to be suspended during the cleaning process, which affects the user's use. In addition, the degree of use of the filtering device cannot be judged. When the filter element of the filtering device is blocked too much, it will affect ventilation. Utility Model Content

[0004] The purpose of the utility model is to provide a liquefied natural gas transmission pipeline in order to solve the above problems.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0006] A liquefied natural gas transmission pipeline comprises a first main transmission pipeline, a second main transmission pipeline and an auxiliary transmission pipeline, wherein the gas outlet of the first main transmission pipeline and the gas inlet of the second main transmission pipeline are both connected to a tee, the horizontal output end and the vertical output end of the tee connected to the gas outlet of the first main transmission pipeline are both connected to a shut-off valve, the output end of the shut-off valve located in the vertical direction is connected to a safety valve, and the output end of the shut-off valve located in the horizontal direction and the output end of the safety valve are respectively connected to a filter tube through a fixing ring; the horizontal output end and the vertical input end of the tee connected to the gas inlet of the second main transmission pipeline are both connected to a check valve, the input end of the check valve located in the horizontal direction is connected to the output end of the filter tube connected to the shut-off valve also located in the horizontal direction through a fixing ring, the input end of the check valve located in the vertical direction is connected to the auxiliary transmission pipeline, and the auxiliary transmission pipeline is connected to the output end of the filter tube connected to the safety valve through a fixing ring.

[0007] Preferably, flanges are provided at both ends of the filter tube, the check valve input end located in the horizontal direction, the shut-off valve output end located in the horizontal direction, the auxiliary conveying pipeline input end, and the safety valve output end, to facilitate the connection of the check valve input end located in the horizontal direction, the shut-off valve output end located in the horizontal direction, the auxiliary conveying pipeline input end, the safety valve output end and the filter tube, and replacement of the filter tube will not affect user use.

[0008] Preferably, the fixing ring comprises two half-moon rings, and grooves for fixing the flange are provided on the side walls on opposite sides of the two half-moon rings. One end of the two half-moon rings is hinged by a hinge, and a lug is provided at the other end. A through hole for installing a bolt is provided on the lug, and the flange can be fixed by the groove after the two lugs are combined, so as to facilitate the quick connection of the check valve input end located in the horizontal direction, the shut-off valve output end located in the horizontal direction, the auxiliary delivery pipeline input end, the safety valve output end and the filter tube.

[0009] Preferably, soft cushions are provided on the side walls on both sides of the groove to facilitate clamping of the flange and provide better air tightness to prevent natural gas leakage.

[0010] Preferably, the filter tube includes a tube body, a filter screen and a filter element. The filter screen is tubular and is transversely arranged and installed in the tube body. The filter element is fixed in the filter screen. The filter screen is arranged in the tube body, and the filter element is fixed in the filter screen. The filter screen is tubular, the filtering surface is larger, and the filtering effect is better.

[0011] Preferably, pressure sensors are installed on both sides of the filter screen inside the tube body, a display panel is installed on the outer wall of the tube body, and the pressure sensors are electrically connected to the display panels respectively. The values ​​measured by the pressure sensors are displayed on the display panels, and the usage rate of the filter element can be judged by comparison, so that the filter element can be replaced or cleaned in time when the blockage area of ​​the filter element is too large, thereby ensuring the filtering effect of natural gas.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] 1. The installation and disassembly of the filter tube are very convenient. When replacing the filter tube, the filter tube between the first main conveying pipeline and the second main conveying pipeline and the filter tube connected to the auxiliary conveying pipeline can be replaced in turn by using the shut-off valve. There is no need to stop the gas supply, which does not affect the user's use and is highly practical.

[0014] 2. The filter tube has good filtering effect and large filtering surface. The filter tube between the first main conveying pipeline and the second main conveying pipeline, and the filter tube connected to the auxiliary conveying pipeline, are used together. Not only is the filtering effect good, but also it can avoid the blockage area of ​​the filter element being too large to affect ventilation.

[0015] 3. The display panel displays the value measured by the pressure sensor. By comparison, the usage rate of the filter element can be determined, so that the filter element can be replaced or cleaned in time when the blockage area of ​​the filter element is too large to ensure the filtering effect of natural gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a three-dimensional diagram of a liquefied natural gas transmission pipeline described in the utility model;

[0018] Figure 2 This is a front view of a liquefied natural gas transmission pipeline described in the utility model;

[0019] Figure 3 It is a cross-sectional view of a filter tube of a liquefied natural gas transmission pipeline described in the utility model;

[0020] Figure 4 It is a schematic diagram of a half-moon ring structure of a liquefied natural gas transmission pipeline described in the utility model;

[0021] Figure 5 It is a half-moon ring cross-sectional view of a liquefied natural gas transmission pipeline described in the utility model.

[0022] The following are the descriptions of the reference numerals:

[0023] 1. First main delivery pipeline; 2. Second main delivery pipeline; 3. Auxiliary delivery pipeline; 4. Tee; 5. Shut-off valve; 6. Safety valve; 7. Filter tube; 701. Tube body; 702. Filter screen; 703. Filter element; 704. Pressure sensor; 705. Display panel; 8. Fixing ring; 801. Half-moon ring; 802. Groove; 803. Lug; 804. Through hole; 805. Cushion; 9. Check valve; 10. Flange. DETAILED DESCRIPTION

[0024] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0026] The utility model is further described below in conjunction with the accompanying drawings:

[0027] Example 1

[0028] like Figure 1-Figure 5 As shown, a liquefied natural gas transmission pipeline comprises a first main transmission pipeline 1, a second main transmission pipeline 2 and an auxiliary transmission pipeline 3, the gas outlet of the first main transmission pipeline 1 and the gas inlet of the second main transmission pipeline 2 are both connected to a tee 4, the horizontal output end and the vertical output end of the tee 4 connected to the gas outlet of the first main transmission pipeline 1 are both connected to a shut-off valve 5, the output end of the shut-off valve 5 located in the vertical direction is connected to a safety valve 6, and the output end of the shut-off valve 5 and the output end of the safety valve 6 located in the horizontal direction are respectively connected to a filter tube 7 through a fixing ring 8; the horizontal output end and the vertical input end of the tee 4 connected to the gas inlet of the second main transmission pipeline 2 are both connected to a check valve 9, the input end of the check valve 9 located in the horizontal direction is connected to the output end of the filter tube 7 connected to the shut-off valve 5 also located in the horizontal direction through the fixing ring 8, the input end of the check valve 9 located in the vertical direction is connected to the auxiliary transmission pipeline 3, and the auxiliary transmission pipeline 3 is connected to the output end of the filter tube 7 connected to the safety valve 6 through the fixing ring 8.

[0029] Preferably, flanges 10 are provided at both ends of the filter tube 7, the input end of the check valve 9 located in the horizontal direction, the output end of the shut-off valve 5 located in the horizontal direction, the input end of the auxiliary delivery pipeline 3, and the output end of the safety valve 6, so as to facilitate the connection between the input end of the check valve 9 located in the horizontal direction, the output end of the shut-off valve 5 located in the horizontal direction, the input end of the auxiliary delivery pipeline 3, the output end of the safety valve 5 and the filter tube 7, and the replacement of the filter tube 7 will not affect the use of the user.

[0030] The fixing ring 8 includes two half-moon rings 801, and grooves 802 for fixing the flange 10 are provided on the side walls on the opposite sides of the two half-moon rings 801. One end of the two half-moon rings 801 is hinged by a hinge, and a lug 803 is provided at the other end. A through hole 804 for installing a bolt is provided on the lug 803, and the two lugs 803 can fix the flange 10 through the groove 802 after being combined, so as to facilitate the quick connection of the input end of the check valve 9 located in the horizontal direction, the output end of the shut-off valve 5 located in the horizontal direction, the input end of the auxiliary conveying pipeline 3, the output end of the safety valve 5 and the filter tube 7.

[0031] Soft cushions 805 are provided on the side walls on both sides of the groove 802 to improve air tightness and prevent natural gas leakage.

[0032] The filter tube 7 includes a tube body 701, a filter screen 702 and a filter element 703. The filter screen 702 is tubular and is horizontally arranged and installed in the tube body 701. The filter element 703 is fixed in the filter screen 702. The filter screen 702 is arranged in the tube body, and the filter element 703 is fixed in the filter screen 702. The filter screen 702 is tubular and has a larger filtering surface and a better filtering effect.

[0033] Pressure sensors 704 are installed on both sides of the filter 702 in the tube body 701, and a display panel 705 is installed on the outer wall of the tube body 701. The pressure sensors 704 are electrically connected to the display panels 705 respectively. The display panels 705 display the values ​​measured by the pressure sensors 704. The usage rate of the filter element 703 can be judged by comparison, so that the filter element 703 can be replaced or cleaned in time when the blockage area of ​​the filter element 703 is too large, thereby ensuring the filtering effect of natural gas.

[0034] Working principle: Before use, the filter tube 7 is installed between the first main delivery pipeline 1 and the second main delivery pipeline 2, and between the safety valve 6 and the auxiliary delivery pipeline 3, and a fixing ring 8 is used for connection. Not only is the connection reliable, but it is also very convenient to install and use, and has good sealing performance to prevent natural gas leakage.

[0035] A filter screen 702 is arranged in the pipe body, and a filter element 703 is fixed in the filter screen 702. The filter screen 702 is tubular with a larger filtering surface and a better filtering effect. The value measured by the pressure sensor 704 is displayed on the display panel 705. The utilization rate of the filter element 703 can be judged by comparison, so that the filter element 703 can be replaced or cleaned in time when the blocking area of ​​the filter element 703 is too large, thereby ensuring the filtering effect of the natural gas.

[0036] When the device is used, the shut-off valves 5 are all open. When the filter tube 7 between the first main delivery pipeline 1 and the second main delivery pipeline 2 filters out impurities in the natural gas, resulting in a large blockage area and a slightly insufficient gas supply, the pressure in the first main delivery pipeline 1 increases, triggering the piston baffle in the safety valve 6 to open, and the natural gas enters the filter tube 7 connected to the auxiliary delivery pipeline 3 through the output end of the safety valve 6 for filtration and finally flows into the second main delivery pipeline 2, ensuring normal gas supply while ensuring the filtering effect of the natural gas;

[0037] During continuous operation, when the blockage area of ​​the filter tube 7 between the first main delivery pipeline 1 and the second main delivery pipeline 2 is too large and the gas supply is not smooth, the pressure in the first main delivery pipeline 1 increases, triggering the continuous and increasing opening of the piston baffle in the safety valve 6, and the outlet vent increases. The natural gas enters the filter tube 7 connected to the auxiliary delivery pipeline 3 through the output end of the safety valve 6 for filtration and finally flows into the second main delivery pipeline 2.

[0038] The display panel 705 can display the values ​​measured by the pressure sensors 704 on both sides of the filter element 703 in the filter tube 7. By comparison, the utilization rate of the filter element 703 can be determined. When the display panel 705 shows that the pressure value at the air inlet end is too large, it means that the blocking area of ​​the filter element 703 is too large and the ventilation is not smooth. The filter element 703 needs to be replaced or cleaned in time to ensure the filtering effect of natural gas.

[0039] Moreover, the installation and removal of the filter tube 7 are very convenient, and when replacing the filter tube 7, the filter tube between the first main delivery pipeline 1 and the second main delivery pipeline 2 and the filter tube 7 connected to the auxiliary delivery pipeline 3 can be replaced in turn by using the cut-off valve 5, without stopping the gas supply, and without affecting the user's use, and the practicality is strong. The specific operation is as follows:

[0040] Normally, the filter tube 7 between the first main conveying pipeline 1 and the second main conveying pipeline 2 has been used for a longer time and needs to be replaced first. First, close the shut-off valve 5 in the horizontal direction, and then open the fixing ring 8 to take out the old filter tube 7 for cleaning or directly replace it with a new filter tube 7. After the filter tube 7 between the first main conveying pipeline 1 and the second main conveying pipeline 2 is replaced, the fixing ring 8 needs to be tightened for reinforcement. Next, open the shut-off valve 5 in the horizontal direction and then close the shut-off valve 5 in the vertical direction. Then, clean or replace the filter tube 7 connected to the auxiliary conveying pipeline 3 according to the above process. Finally, open the shut-off valve 5 in the vertical direction to complete the replacement of the filter tube 7. The disassembly and assembly efficiency is high, there is no need to stop the gas supply, and it does not affect the user's use, and it is highly practical.

[0041] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A liquefied natural gas transmission pipeline, comprising a first main transmission pipeline (1), a second main transmission pipeline (2) and an auxiliary transmission pipeline (3), characterized in that: The air outlet of the first main delivery pipeline (1) and the air inlet of the second main delivery pipeline (2) are both connected to a tee (4); the horizontal output end and the vertical output end of the tee (4) connected to the air outlet of the first main delivery pipeline (1) are both connected to a shutoff valve (5); the output end of the shutoff valve (5) in the vertical direction is connected to a safety valve (6); the output end of the shutoff valve (5) and the output end of the safety valve (6) in the horizontal direction are each connected to a filter tube (7) via a fixing ring (8); The horizontal output end and the vertical input end of the three-way valve (4) connected to the air inlet of the second main delivery pipeline (2) are both connected to a check valve (9); the input end of the check valve (9) located in the horizontal direction is connected to the output end of the filter tube (7) connected to the shut-off valve (5) also located in the horizontal direction through a fixing ring (8); the input end of the check valve (9) located in the vertical direction is connected to the auxiliary delivery pipeline (3); and the auxiliary delivery pipeline (3) is connected to the output end of the filter tube (7) connected to the safety valve (6) through a fixing ring (8).

2. A liquefied natural gas pipeline according to claim 1, characterized in that: Flanges (10) are provided at both ends of the filter tube (7), the input end of the check valve (9) located in the horizontal direction, the output end of the shut-off valve (5) located in the horizontal direction, the input end of the auxiliary delivery pipeline (3), and the output end of the safety valve (6).

3. A liquefied natural gas transmission pipeline according to claim 2, characterized in that: The fixing ring (8) comprises two half-moon rings (801), and grooves (802) for fixing the flange (10) are provided on the side walls on opposite sides of the two half-moon rings (801). One end of the two half-moon rings (801) is hinged by a hinge, and the other end is provided with a lug (803), and the lug (803) is provided with a through hole (804) for installing a bolt, and the two lugs (803) can fix the flange (10) through the groove (802) after being combined.

4. A liquefied natural gas transmission pipeline according to claim 3, characterized in that: Soft pads (805) are provided on the side walls on both sides of the groove (802).

5. The liquefied natural gas transmission pipeline according to claim 1, characterized in that: The filter tube (7) comprises a tube body (701), a filter screen (702) and a filter element (703); the filter screen (702) is tubular and is transversely arranged and installed in the tube body (701); and the filter element (703) is fixed in the filter screen (702).

6. A liquefied natural gas transmission pipeline according to claim 5, characterized in that: Pressure sensors (704) are installed on both sides of the filter screen (702) in the tube body (701), a display panel (705) is installed on the outer wall of the tube body (701), and the pressure sensors (704) are electrically connected to the display panels (705) respectively.

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