Natural gas pipeline emptying device

Abstract

The utility model discloses a natural gas pipeline emptying device which comprises a first emptying assembly and a second emptying assembly, and the first emptying assembly and the second emptying assembly are connected through a main pipeline. The first emptying assembly comprises a first emptying vertical pipe, a third pressure transmitter, a first insulating joint, a first pressure control module, a first throttling cut-off emptying valve and an emptying pipeline; the second emptying assembly comprises a second emptying vertical pipe, a fourth pressure transmitter, a second pressure control module, a second throttling stop emptying valve and a connecting pipeline. According to the utility model, the corresponding pressure transmitters are arranged at the tail ends of the first emptying vertical pipe and the second emptying vertical pipe, and the emptying flow state can be objectively reflected through the corresponding relation between the read pressure value and the emptying flow speed; the emptying device continuously and stably adjusts the opening degree of the valve, the emptying valve works stably and continuously, and subjective judgment and operation of the emptying valve and excessive noise are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of safe gas venting, in particular to a natural gas pipeline venting device. Background Art

[0002] A natural gas pipeline is a pipeline that transports natural gas from the mining site or processing plant to the urban gas distribution center or industrial enterprise user. It is also called a gas transmission pipeline. Using a natural gas pipeline to transport natural gas is a way to transport a large amount of natural gas on land. At present, manual vent valves are used to vent natural gas pipelines. During the venting operation, the venting status is manually judged and the opening of the vent valve is intermittently adjusted.

[0003] In the prior art, for example, the technical solution recorded in the utility model patent with publication number: "CN216896830U": a hydrogen safety venting device, which realizes the safe venting of hydrogen through components such as a hydrogen buffer tank, an oxygen concentration detector, a hydrogen concentration detector, a first programmable valve, a second programmable valve and a flame arrester.

[0004] The existing technology lacks relevant detection instruments for the venting process, making it difficult to objectively judge the venting flow state; it requires subjective human judgment on the timing and degree of valve opening, and is unable to accurately set and control the valve. The vent valve is prone to excessive opening, resulting in excessive vibration and noise. Utility Model Content

[0005] The utility model aims to provide a natural gas pipeline venting device to solve the problems in the prior art proposed in the background technology, that during the venting process, there is a lack of relevant detection instruments, making it difficult to objectively judge the venting flow state; it is necessary to subjectively judge the valve opening timing and opening degree, and it is impossible to accurately set and control the valve.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A natural gas pipeline venting device comprises a first venting component and a second venting component, wherein the first venting component and the second venting component are connected via a trunk pipeline;

[0008] The first venting assembly includes a first venting riser, a first pressure transmitter, a first insulating joint, a first pressure control module, a first throttling stop venting valve and a venting pipeline; wherein the first venting riser is connected to the first insulating joint and one end of the first pressure transmitter respectively; the other end of the first pressure transmitter is connected to the first pressure control module, the other end of the first insulating joint is connected to one end of the first throttling stop venting valve, the first throttling stop venting valve is connected to one end of the venting pipeline, and the other end of the venting pipeline is connected to the trunk pipeline;

[0009] The second vent assembly includes a second vent riser, a fourth pressure transmitter, a second pressure control module, a second throttling stop vent valve and a connecting pipeline; wherein the second vent riser is connected to the fourth pressure transmitter and one end of the second throttling stop vent valve respectively; the other end of the fourth pressure transmitter is connected to the second pressure control module; the other end of the second throttling stop vent valve is connected to the connecting pipeline; and the connecting pipeline is connected to the trunk pipeline.

[0010] According to the above technical solution, the vent pipeline includes a first vent pipeline, a second vent pipeline and a first trunk shut-off valve, wherein the first trunk shut-off valve is arranged on the trunk pipeline for opening or closing the trunk pipeline; the first vent pipeline and the second vent pipeline are respectively arranged on both sides of the first trunk shut-off valve.

[0011] According to the above technical solution, the first vent pipeline includes a first three-way pipe, a first branch ball valve, a first bypass ball valve, a third pressure transmitter and a first pressure gauge; wherein the first three-way pipe is arranged on the trunk pipeline, the first three-way pipe is respectively connected to the first branch ball valve, the third pressure transmitter and one end of the first bypass ball valve, the other end of the first branch ball valve is connected to the first pressure gauge, and the other end of the first bypass ball valve is connected to the first bypass throttling stop valve.

[0012] According to the above technical solution, the first vent line also includes a first bypass throttling stop valve, one end of the first bypass throttling stop valve is connected to the first vent line, and the other end of the first bypass throttling stop valve is connected to the second vent line and the first throttling stop vent valve.

[0013] According to the above technical solution, the second venting pipeline includes a second three-way pipe, a second pressure transmitter, a second branch ball valve, a second pressure gauge and a second bypass ball valve; wherein the second three-way pipe is arranged on the trunk pipeline, and the second three-way pipe is respectively connected to one end of the second pressure transmitter, the second branch ball valve and the second bypass ball valve; the other end of the second branch ball valve is connected to the second pressure gauge; the other end of the second bypass ball valve is respectively connected to the first bypass throttling stop valve and the first throttling stop venting valve of the first venting pipeline.

[0014] According to the above technical solution, the first venting pipeline also includes a purge valve, one end of which is connected to the first bypass ball valve, and the other end of which is connected to the outside.

[0015] According to the above technical solution, the connecting pipeline includes a third three-way pipe, a second bypass throttling stop valve, a third bypass ball valve, a third pressure gauge, a fourth bypass ball valve and a fourth pressure gauge;

[0016] The third three-way pipe is connected to the second trunk shut-off valve and one end of the fourth bypass ball valve respectively, and the other end of the fourth bypass ball valve is connected to the fourth pressure gauge, one end of the second bypass throttling stop valve and the second throttling stop vent valve respectively;

[0017] The other end of the second bypass throttling stop valve is connected to one end of the third bypass ball valve, and the other end of the third bypass ball valve is respectively connected to the third pressure gauge and the other end of the second trunk shut-off valve.

[0018] According to the above technical solution, the connecting pipeline also includes a second insulating joint, the second insulating joint is arranged on the trunk pipeline, and the second insulating joint is connected to the third three-way pipe.

[0019] According to the above technical solution, the connecting pipeline also includes a filter, and the filter is respectively connected to the third bypass ball valve, the third pressure gauge and the second trunk shut-off valve.

[0020] According to the above technical solution, the first pressure control module is also connected to the first throttling stop and vent valve; the second pressure control module is also connected to the second throttling stop and vent valve.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] In the utility model, corresponding pressure transmitters are arranged at the ends of the first vent riser and the second vent riser, and the vent flow state can be objectively reflected through the corresponding relationship between the read pressure value and the vent flow rate; the vent device continuously and stably adjusts the valve opening, and the vent valve works stably and continuously, avoiding subjective judgment and operation of the vent valve and excessive noise; the vent flow rate is stable and the vent efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the venting device of the utility model.

[0024] Markings in the figure: 101-first three-way pipe, 102-first trunk shut-off valve, 103-second three-way pipe, 104-third pressure transmitter, 105-second pressure transmitter, 106-first distribution ball valve, 107-first blind plate, 108-first pressure gauge, 109-first bypass ball valve, 110-purge valve, 111-first bypass throttling stop valve, 112-second bypass ball valve, 113-second distribution ball valve, 114-second pressure gauge, 115-second blind plate, 116-first throttling stop vent valve, 117-first pressure control module, 118-first insulating joint, 119-first pressure transmitter, 120-first vent riser;

[0025] 201- Trunk pipeline;

[0026] 301-second insulating joint, 302-third three-way pipe, 303-second trunk shut-off valve, 304-filter, 305-third pressure gauge, 306-third bypass ball valve, 307-second bypass throttling stop valve, 308-fourth bypass ball valve, 309-fourth pressure gauge, 310-second throttling stop vent valve, 311-second pressure control module, 312-fourth pressure transmitter, 313-second vent riser. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Embodiment 1

[0029] like Figure 1 As shown, a natural gas pipeline venting device includes a first venting component and a second venting component, and the first venting component and the second venting component are connected through a trunk pipeline 201;

[0030] The first venting assembly includes a first venting riser 120, a first pressure transmitter 119, a first insulating joint 118, a first pressure control module 117, a first throttling stop venting valve 116 and a venting pipeline; wherein the first venting riser 120 is connected to the first insulating joint 118 and one end of the first pressure transmitter 119 respectively; the other end of the first pressure transmitter 119 is connected to the first pressure control module 117, the other end of the first insulating joint 118 is connected to one end of the first throttling stop venting valve 116, the first throttling stop venting valve 116 is connected to one end of the venting pipeline, and the other end of the venting pipeline is connected to the trunk pipeline 201;

[0031] The second venting assembly includes a second venting riser 313, a fourth pressure transmitter 312, a second pressure control module 311, a second throttling stop venting valve 310 and a connecting pipeline; wherein the second venting riser 313 is connected to the fourth pressure transmitter 312 and one end of the second throttling stop venting valve 310 respectively; the other end of the fourth pressure transmitter 312 is connected to the second pressure control module 311; the other end of the second throttling stop venting valve 310 is connected to the connecting pipeline; and the connecting pipeline is connected to the trunk pipeline 201.

[0032] In the utility model, corresponding pressure transmitters are arranged at the ends of the first venting riser 120 and the second venting riser 313, and the corresponding relationship between the read pressure value and the venting flow rate can objectively reflect the venting flow state; the venting device continuously and stably adjusts the valve opening, and the venting valve works stably and continuously, avoiding subjective judgment and operation of the venting valve and excessive noise; the venting flow rate is stable and the venting efficiency is high.

[0033] Embodiment 2

[0034] This embodiment is a further refinement of the first embodiment.

[0035] The vent line includes a first vent line, a second vent line and a first trunk shut-off valve 102, wherein the first trunk shut-off valve 102 is arranged on the trunk pipeline 201 for opening or closing the trunk pipeline 201; the first vent line and the second vent line are respectively arranged on both sides of the first trunk shut-off valve 102.

[0036] The first venting pipeline includes a first three-way pipe 101, a first branch ball valve 106, a first bypass ball valve 109, a third pressure transmitter 104 and a first pressure gauge 108; wherein the first three-way pipe 101 is arranged on the trunk pipeline 201, and the first three-way pipe 101 is respectively connected to one end of the first branch ball valve 106, the third pressure transmitter 104 and the first bypass ball valve 109, the other end of the first branch ball valve 106 is connected to the first pressure gauge 108, and the other end of the first bypass ball valve 109 is connected to the first bypass throttling stop valve 111.

[0037] The first vent line also includes a first bypass throttling stop valve 111 , one end of which is connected to the first vent line, and the other end of which is connected to the second vent line and the first throttling stop vent valve 116 .

[0038] The second venting pipeline includes a second three-way pipe 103, a second pressure transmitter 105, a second branch ball valve 113, a second pressure gauge 114 and a second bypass ball valve 112; wherein the second three-way pipe 103 is arranged on the trunk pipeline 201, and the second three-way pipe 103 is respectively connected to the second pressure transmitter 105, the second branch ball valve 113 and one end of the second bypass ball valve 112; the other end of the second branch ball valve 113 is connected to the second pressure gauge 114; the other end of the second bypass ball valve 112 is respectively connected to the first bypass throttling stop valve 111 and the first throttling stop vent valve 116 of the first venting pipeline.

[0039] The first vent line further includes a purge valve 110 , one end of the purge valve 110 is connected to the first bypass ball valve 109 , and the other end of the purge valve 110 is in communication with the outside.

[0040] The connecting pipeline includes a third three-way pipe 302, a second bypass throttling stop valve 307, a third bypass ball valve 306, a third pressure gauge 305, a fourth bypass ball valve 308 and a fourth pressure gauge 309;

[0041] The third three-way pipe 302 is respectively connected to the second trunk shut-off valve 303 and one end of the fourth bypass ball valve 308, and the other end of the fourth bypass ball valve 308 is respectively connected to the fourth pressure gauge 309, one end of the second bypass throttling stop valve 307 and the second throttling stop vent valve 310;

[0042] The other end of the second bypass throttling stop valve 307 is connected to one end of the third bypass ball valve 306 , and the other end of the third bypass ball valve 306 is connected to the third pressure gauge 305 and the other end of the second trunk shutoff valve 303 , respectively.

[0043] The connecting pipeline further includes a second insulating joint 301 , which is disposed on the trunk pipeline 201 and connected to the third tee pipe 302 .

[0044] The connecting pipeline further includes a filter 304 , which is connected to the third bypass ball valve 306 , the third pressure gauge 305 and the second trunk shut-off valve 303 respectively.

[0045] The first pressure control module 117 is also connected to the first throttle cut-off vent valve 116 ; the second pressure control module 311 is also connected to the second throttle cut-off vent valve 310 .

[0046] The working principle of the utility model is:

[0047] Taking the first venting component as a valve chamber and the second venting component as a station field as an example, the venting principle of the utility model is explained.

[0048] When the trunk pipeline 201 operates normally, the first trunk intercept valve 102 and the second trunk intercept valve 303 are in an open state, and the remaining valves are in a closed state.

[0049] When the trunk pipeline 201 needs to be emptied, first close the first trunk shut-off valve 102 and the second trunk shut-off valve 303 upstream and downstream of the trunk pipeline 201, and confirm that the valves are fully closed. The first trunk shut-off valve 102 and the second trunk shut-off valve 303 are cut off to ensure that only the trunk pipeline 201 is emptied without affecting the operation of the upstream and downstream pipelines.

[0050] Then, the second bypass ball valve 112 and the third bypass ball valve 306 are opened to guide the natural gas stored in the trunk pipeline 201 to the venting pipeline.

[0051] When venting begins, the first pressure transmitter 119 and the fourth pressure transmitter 312 detect the discharge pressure of the first venting riser 120 and the second venting riser 313 respectively, and the detection values ​​of the first venting riser 120 and the second venting riser 313 are compared with the set values ​​through the first pressure control module 117 and the second pressure control module 311 respectively. If the detection value is lower than the set value, the opening of the first throttling stop vent valve 116 and the second throttling stop vent valve 310 is slowly increased.

[0052] If the detected value is higher than the set value, the opening of the first throttling stop and vent valve 116 and the second electric throttling stop and vent valve 310 is reduced.

[0053] As the venting process proceeds, the natural gas pressure in the trunk pipeline 201 gradually decreases, the openings of the first throttling stop vent valve 116 and the second throttling stop vent valve 310 gradually increase, and interlocking control is used to ensure that the discharge pressures of the first vent riser 120 and the second vent riser 313 detected by the first pressure transmitter 119 and the fourth pressure transmitter 312 are stable at the set value.

[0054] When the pressure value detected by the first pressure transmitter 119, the fourth pressure transmitter 312, the second pressure transmitter 105, and the fourth pressure gauge 309 is 0 kPa, it is determined that the trunk pipeline 201 has been emptied, the venting instruction has ended, the first electric / pneumatic throttling stop vent valve 116, the second throttling stop vent valve 310, the second bypass ball valve 112, and the third bypass ball valve 306 are closed, and the venting operation is completed.

[0055] Furthermore, the first ball transfer valve 106 is also connected to the first blind plate 107 , and the second ball transfer valve 113 is also connected to the second blind plate 115 .

[0056] After the venting is completed, subsequent maintenance, inspection, expansion and other work can be carried out. For example, purging and nitrogen replacement can be carried out through the purge valve 110; the downstream branch pipeline can be expanded from the first blind plate 107 and the second blind plate 115, and the downstream branch pipeline expanded in the future can also be vented through the venting device.

[0057] The devices used in the utility model are all existing devices. For example, the transfer ball valve and bypass ball valve adopt VQ47Y ball valve. The throttling stop vent valve adopts J941H electric stop valve. The cut-off valve adopts J41F46-16C valve.

[0058] The pressure transmitter uses a digital pressure gauge ACD-201 pressure transmitter.

[0059] The pressure control module adopts PLC or single chip microcomputer.

[0060] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0061] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A natural gas pipeline venting device, characterized in that: It comprises a first venting component and a second venting component, wherein the first venting component and the second venting component are connected via a trunk pipeline (201); The first venting assembly comprises a first venting riser (120), a first pressure transmitter (119), a first insulating joint (118), a first pressure control module (117), a first throttling stop venting valve (116) and a venting pipeline; wherein the first venting riser (120) is connected to the first insulating joint (118) and one end of the first pressure transmitter (119) respectively; the other end of the first pressure transmitter (119) is connected to the first pressure control module (117); the other end of the first insulating joint (118) is connected to one end of the first throttling stop venting valve (116); the first throttling stop venting valve (116) is connected to one end of the venting pipeline; and the other end of the venting pipeline is connected to the trunk pipeline (201); The second venting assembly comprises a second venting riser (313), a fourth pressure transmitter (312), a second pressure control module (311), a second throttling stop venting valve (310) and a connecting pipeline; wherein the second venting riser (313) is connected to one end of the fourth pressure transmitter (312) and the second throttling stop venting valve (310) respectively; the other end of the fourth pressure transmitter (312) is connected to the second pressure control module (311); the other end of the second throttling stop venting valve (310) is connected to the connecting pipeline; and the connecting pipeline is connected to the trunk pipeline (201).

2. A natural gas pipeline venting device according to claim 1, characterized in that: The vent pipeline comprises a first vent pipeline, a second vent pipeline and a first trunk shutoff valve (102), wherein the first trunk shutoff valve (102) is arranged on the trunk pipeline (201) and is used to open or close the trunk pipeline (201); the first vent pipeline and the second vent pipeline are respectively arranged on both sides of the first trunk shutoff valve (102).

3. A natural gas pipeline venting device according to claim 2, characterized in that: The first venting pipeline comprises a first three-way pipe (101), a first sub-transmission ball valve (106), a first bypass ball valve (109), a third pressure transmitter (104) and a first pressure gauge (108); wherein the first three-way pipe (101) is arranged on the trunk pipeline (201), the first three-way pipe (101) is respectively connected to one end of the first sub-transmission ball valve (106), the third pressure transmitter (104) and the first bypass ball valve (109), the other end of the first sub-transmission ball valve (106) is connected to the first pressure gauge (108), and the other end of the first bypass ball valve (109) is connected to the first bypass throttling stop valve (111).

4. A natural gas pipeline venting device according to claim 3, characterized in that: The first venting pipeline further comprises a first bypass throttling stop valve (111), one end of the first bypass throttling stop valve (111) is connected to the first venting pipeline, and the other end of the first bypass throttling stop valve (111) is connected to the second venting pipeline and the first throttling stop venting valve (116).

5. A natural gas pipeline venting device according to claim 4, characterized in that: The second venting pipeline comprises a second three-way pipe (103), a second pressure transmitter (105), a second ball-transfer valve (113), a second pressure gauge (114) and a second bypass ball valve (112); wherein the second three-way pipe (103) is arranged on the trunk pipeline (201); the second three-way pipe (103) is respectively connected to one end of the second pressure transmitter (105), the second ball-transfer valve (113) and the second bypass ball valve (112); the other end of the second ball-transfer valve (113) is connected to the second pressure gauge (114); and the other end of the second bypass ball valve (112) is respectively connected to the first bypass throttling stop valve (111) and the first throttling stop venting valve (116) of the first venting pipeline.

6. A natural gas pipeline venting device according to claim 5, characterized in that: The first venting pipeline further comprises a purge valve (110), one end of the purge valve (110) is connected to the first bypass ball valve (109), and the other end of the purge valve (110) is connected to the outside.

7. A natural gas pipeline venting device according to claim 1, characterized in that: The connecting pipeline comprises a third three-way pipe (302), a second bypass throttling stop valve (307), a third bypass ball valve (306), a third pressure gauge (305), a fourth bypass ball valve (308) and a fourth pressure gauge (309); The third three-way pipe (302) is respectively connected to the second trunk shutoff valve (303) and one end of the fourth bypass ball valve (308), and the other end of the fourth bypass ball valve (308) is respectively connected to the fourth pressure gauge (309), one end of the second bypass throttling stop valve (307) and the second throttling stop vent valve (310); The other end of the second bypass throttling stop valve (307) is connected to one end of the third bypass ball valve (306), and the other end of the third bypass ball valve (306) is respectively connected to the other end of the third pressure gauge (305) and the second trunk shut-off valve (303).

8. A natural gas pipeline venting device according to claim 7, characterized in that: The connecting pipeline further comprises a second insulating joint (301), the second insulating joint (301) being arranged on the trunk pipeline (201), and the second insulating joint (301) being connected to the third tee pipe (302).

9. A natural gas pipeline venting device according to claim 8, characterized in that: The connecting pipeline further comprises a filter (304), and the filter (304) is respectively connected to the third bypass ball valve (306), the third pressure gauge (305) and the second trunk shut-off valve (303).

10. A natural gas pipeline venting device according to claim 1, characterized in that: The first pressure control module (117) is also connected to the first throttling stop and vent valve (116); and the second pressure control module (311) is also connected to the second throttling stop and vent valve (310).

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