Negative pressure high-efficiency auxiliary nitrogen replacement device

Abstract

The utility model relates to natural gas pipeline high risk operation technical field, especially in kind of negative pressure high -efficient auxiliary nitrogen replacement device. The utility model discloses a negative pressure high -efficient auxiliary nitrogen replacement device including nitrogen replacement supply device and set up on the nitrogen injection port and the inspection port of natural gas pipeline, the nitrogen injection port and the inspection port distribution are in the upstream and downstream of the equipment to be overhauled on natural gas pipeline, the output of nitrogen replacement supply device is connected the nitrogen injection port through the pipeline, and the inspection port is connected with negative pressure system. Advantage: simple and reasonable, simple installation, convenient to use, effective nitrogen loss, improve the replacement efficiency, improve the nitrogen replacement quality.

Description

TECHNICAL FIELD

[0001] The utility model relates to natural gas pipeline high risk operation technical field, especially in kind of negative pressure high -efficient auxiliary nitrogen replacement device. BACKGROUND

[0002] Nitrogen replacement is the current petrochemical industry pipeline opening, pipeline hot work, disassembly and repair, into the limited space and other high risk operation essential process.

[0003] Taking the natural gas pipeline opening operation area as an example, the current industry usually adopts the mode of nitrogen continuous purging or pressure holding cycle purging to carry out gas replacement, and the pipeline opening operation can be carried out after ensuring that the gas replacement meets the standard, since the nitrogen injection port and the drainage port or the detection port are medium flow through the existing interface of the pipeline auxiliary equipment flange, instrument valve group plug, vent nozzle and blowdown nozzle, almost not in the pipe end part, there must be a cecum section, which increases the difficulty of nitrogen replacement, and the combustible gas in the cecum section is difficult to replace completely in a short time, which inevitably increases the nitrogen purging replacement time.

[0004] Therefore, it is necessary to develop a kind of negative pressure high -efficient auxiliary nitrogen replacement device to overcome the above technical problems. UTILITY MODEL CONTENT

[0005] The utility model solves the technical problem that provides a kind of negative pressure high -efficient auxiliary nitrogen replacement device, effectively overcome the defects of prior art.

[0006] The technical scheme that the utility model solves above technical problem is as follows:

[0007] A kind of negative pressure high -efficient auxiliary nitrogen replacement device, including nitrogen replacement supply device and be set on natural gas pipeline and check the nitrogen injection port and port, the nitrogen injection port and check the port distribution in the upstream and downstream of the equipment to be overhauled on natural gas pipeline, the output of the nitrogen replacement supply device is connected with the nitrogen injection port by pipeline, the port is connected with negative pressure system.

[0008] On the basis of the above technical scheme, the utility model can also be improved as follows.

[0009] Further, the two ends of the natural gas pipeline are respectively provided with control valves.

[0010] Further, the control valve is a ball valve.

[0011] Further, a first pressure gauge is sealingly installed at the check port, and a detection port of the first pressure gauge is connected with the negative pressure system.

[0012] Further, the negative pressure system comprises a negative pressure joint and a negative pressure device, the negative pressure joint is connected to the detection port of the first pressure gauge, and the negative pressure joint is connected to the negative pressure device through a pipeline.

[0013] Further, the negative pressure system comprises a three-way joint, one interface of the three-way joint is connected to the detection port of the first pressure gauge, and the other interface of the three-way joint is connected to the output port of the nitrogen replacement supply device through a pipeline.

[0014] Further, the output port of the nitrogen replacement supply device is connected to one interface of the three-way, and the other two interfaces of the three-way are respectively connected to the nitrogen injection port and the other interface of the three-way joint through pipelines.

[0015] Further, the other two interfaces of the three-way are respectively provided with flow valves.

[0016] Further, a second pressure gauge is sealingly installed at the nitrogen injection port, a detection port of the second pressure gauge is connected to a nitrogen injection joint provided with a valve, and the nitrogen injection joint is connected to the nitrogen replacement supply device through a pipeline.

[0017] Further, the nitrogen replacement supply device is a nitrogen cylinder.

[0018] The nitrogen replacement device has the advantages of simple and reasonable structure, simple installation, convenient use, effective nitrogen consumption saving, improved replacement efficiency and improved nitrogen replacement quality. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a structural schematic view of a negative pressure efficient auxiliary nitrogen replacement device according to the present application;

[0020] Figure 2 FIG. 2 is a structural schematic view of another embodiment of the negative pressure efficient auxiliary nitrogen replacement device according to the present application;

[0021] Figure 3 FIG. 3 is a structural schematic view of a three-way joint in the negative pressure efficient auxiliary nitrogen replacement device according to the present application.

[0022] In the drawings, the components represented by the numbers are listed as follows:

[0023] 1, nitrogen replacement supply device; 2, natural gas pipeline; 3, equipment to be inspected; 4, control valve; 5, first pressure gauge; 6, second pressure gauge; 7, negative pressure joint; 8, negative pressure device; 9, three-way joint; 10, three-way; 21, nitrogen injection port; 22, inspection port; 51, nitrogen injection joint. DETAILED DESCRIPTION

[0024] The principles and characteristics of the utility model are described below in combination with the drawings, and the examples are only used to explain the utility model and not to limit the scope of the utility model.

[0025] Embodiment: As shown in the figure, the negative pressure high-efficiency auxiliary nitrogen replacement device of the embodiment includes a nitrogen replacement supply device 1 and a nitrogen injection port 21 and an inspection port 22 arranged on a natural gas pipeline 2. Figure 1 and 2 The output port of the nitrogen replacement supply device 1 is connected to the nitrogen injection port 21 through a pipeline, and the inspection port 22 is connected to a negative pressure system.

[0026] In the use process of the negative pressure high-efficiency auxiliary nitrogen replacement device of the embodiment, after the pipeline is depressurized and the nitrogen is conventionally purged for one minute (the main amount of natural gas is replaced), the entire auxiliary replacement device is put into use.

[0027] It should be noted that: if the negative pressure system is not arranged, there must be a replacement cecum section in the pipe section between the inspection port 22 and the end of the natural gas pipeline 2 close to it during the replacement process, which increases the difficulty of nitrogen replacement.

[0028] As a preferred embodiment, the two ends of the natural gas pipeline 2 are respectively provided with control valves 4.

[0029] In the above embodiment, the design of the control valves 4 at the two ends of the natural gas pipeline 2 can make the two ends of the natural gas pipeline 2 open or close through the valves, which facilitates the switching operation of replacement or subsequent aeration.

[0030] In the embodiment, the control valve 4 is a ball valve, and a commercially available ball valve of a suitable model can be used.

[0031] As a preferred embodiment, a first pressure gauge 5 is sealingly installed at the inspection port 22, and the detection port of the first pressure gauge 5 is connected to the negative pressure system.

[0032] In the above embodiment, the first pressure gauge 5 is arranged at the inspection port 22, which can detect the pressure distribution at the inspection port 22 in real time and provide effective data indicators for the safety of the replacement process.

[0033] It should be noted that the first pressure gauge 5 is a product of existing technology and has its own detection port. Under normal circumstances, the detection port is sealed with a plug. In this embodiment, the plug is removed and the negative pressure system is connected.

[0034] In this embodiment, the negative pressure system includes at least the following two structural forms:

[0035] 1) such as Figure 1 As shown, the negative pressure system includes a negative pressure connector 7 and a negative pressure device 8. The negative pressure connector 7 is connected to the detection port of the first pressure gauge 5, and the negative pressure connector 7 is connected to the negative pressure device 8 through a pipeline.

[0036] In the above scheme 1), the negative pressure connector 7 (threaded connector) is screwed into the detection port of the first pressure gauge 5. The negative pressure connector 7 is connected to the negative pressure device 8 through the pipeline connected to it. The negative pressure device 8 provides negative pressure to extract gas from the natural gas pipeline 2, promoting rapid and efficient replacement.

[0037] 2) such as Figure 2 As shown, the negative pressure system includes a three-way connector 9. One interface of the three-way connector 9 is connected to the detection port of the first pressure gauge 5, and the other interface of the three-way connector 9 is connected to the output port of the nitrogen replacement supply device 1 through a pipeline.

[0038] In scheme 2) above, the two ports of the tee connector 9 are respectively connected to the detection port of the first pressure gauge 5 and the output port of the nitrogen replacement supply device 1. When the nitrogen replacement supply device 1 outputs nitrogen, the nitrogen enters the tee connector 9 through the port and then exits from the remaining port. During this process, a negative pressure is generated at the port where the tee connector 9 is connected to the first pressure gauge 5. This negative pressure is used to extract the gas from the natural gas pipeline 2, thereby promoting rapid and efficient replacement. This design utilizes the nitrogen output of the nitrogen replacement supply device 1 to generate a negative pressure suction effect. The structural design is very ingenious, without adding any other equipment, and has low operating costs.

[0039] In this embodiment, as Figure 3 As shown, at least one end of the tee connector 9 is configured as an external threaded interface, which is compatible with the test port of the first pressure gauge 5 after the plug has been removed, and the two can be connected by threads.

[0040] In a preferred embodiment, the output port of the nitrogen replacement supply device 1 is connected to one interface of the tee 10, and the remaining two interfaces of the tee 10 are respectively connected to the nitrogen injection port 21 and the other interface of the tee connector 9 through pipelines.

[0041] In the above embodiment, the nitrogen replacement supply device 1 can be connected to the nitrogen injection port 21 and the tee joint 9 through the tee 10, and the pipeline connection is reasonable, so that the nitrogen can be smoothly output.

[0042] In the above embodiment, the tee 10 has two remaining interfaces, and flow valves are arranged on the two interfaces respectively, so that the flow rate can be effectively controlled through the two flow valves, and the nitrogen can be reasonably distributed in the two pipelines.

[0043] As a preferred embodiment, the second pressure gauge 6 is arranged at the nitrogen injection port 21 in a sealing mode, and a nitrogen injection joint 51 with a valve is connected to a detection port of the second pressure gauge 6, and the nitrogen injection joint 51 is connected to the nitrogen replacement supply device 1 through a pipeline.

[0044] The nitrogen injection joint 51 is a threaded joint, which is matched with a threaded port of the second pressure gauge 6 after a plug is removed, and the two are connected in a threaded mode.

[0045] In the above embodiment, the second pressure gauge 6 is arranged at the nitrogen injection port 21, so that the pressure distribution at the nitrogen injection port 21 can be detected in real time, and effective data indexes are provided for the safety of the replacement process.

[0046] In the above embodiment, the nitrogen replacement supply device 1 can be a conventional pressurized nitrogen cylinder.

[0047] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of description of the present application and simplification of description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0048] In addition, the terms "first" and "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0049] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can indirectly connect through intermediate medium, can be the communication of two element internals or the interaction of two elements, unless another definite limitation.For ordinary skilled in the art, can understand the specific meaning of the above terms in the utility model according to specific circumstances.

[0050] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium.Further, the first feature "over", "above" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or it simply means that the first feature is horizontally higher than the second feature.The first feature "under", "below" and "on" the second feature can be that the first feature is directly below or obliquely below the second feature, or it simply means that the first feature is horizontally lower than the second feature.

[0051] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model.In this specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.Further, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0052] Although the embodiments of the utility model have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the utility model.The ordinary skilled in the art can change, modify, replace and modify the above embodiments within the scope of the utility model.

Claims

1. A negative pressure high-efficiency auxiliary nitrogen replacement device, characterized in that: The nitrogen replacement supply device (1) and the nitrogen injection port (21) and the inspection port (22) arranged on the natural gas pipeline (2) are included, the nitrogen injection port (21) and the inspection port (22) are distributed on the upstream and downstream of the equipment (3) to be inspected in the natural gas pipeline (2), the output port of the nitrogen replacement supply device (1) is connected with the nitrogen injection port (21) through a pipeline, and the inspection port (22) is connected with a negative pressure system.

2. The negative pressure high-efficiency auxiliary nitrogen replacement device according to claim 1, characterized in that: The natural gas pipeline (2) is provided with a control valve (4) at each end.

3. The negative pressure high-efficiency auxiliary nitrogen replacement device according to claim 2, characterized in that: The control valve (4) is a ball valve.

4. The negative pressure high-efficiency auxiliary nitrogen replacement device according to claim 1, characterized in that: A first pressure gauge (5) is sealingly arranged at the inspection port (22), and a detection port of the first pressure gauge (5) is connected with the negative pressure system.

5. The negative pressure high-efficiency auxiliary nitrogen replacement device according to claim 4, characterized in that: The negative pressure system includes a negative pressure connector (7) and a negative pressure device (8), the negative pressure connector (7) is connected with the detection port of the first pressure gauge (5), and the negative pressure connector (7) is connected with the negative pressure device (8) through a pipeline.

6. The negative pressure high-efficiency auxiliary nitrogen replacement device according to claim 4, characterized in that: The negative pressure system includes a three-way connector (9), one interface of the three-way connector (9) is connected with the detection port of the first pressure gauge (5), and the other interface of the three-way connector (9) is connected with the output port of the nitrogen replacement supply device (1) through a pipeline.

7. The negative pressure high-efficiency auxiliary nitrogen replacement device according to claim 6, characterized in that: The output port of the nitrogen replacement supply device (1) is connected with one interface of a three-way connector (10), and the other two interfaces of the three-way connector (10) are respectively connected with the nitrogen injection port (21) and the other interface of the three-way connector (9) through pipelines.

8. The negative pressure high-efficiency auxiliary nitrogen replacement device according to claim 7, characterized in that: Flow valves are respectively arranged on the other two interfaces of the three-way connector (10).

9. The negative pressure high-efficiency auxiliary nitrogen replacement device according to any one of claims 1 to 8, characterized in that: A second pressure gauge (6) is sealingly arranged at the nitrogen injection port (21), a detection port of the second pressure gauge (6) is connected with a nitrogen injection connector (51) provided with a valve, and the nitrogen injection connector (51) is connected with the nitrogen replacement supply device (1) through a pipeline.

10. The negative pressure high-efficiency auxiliary nitrogen replacement device according to any one of claims 1 to 8, characterized in that: The nitrogen replacement supply device (1) is a nitrogen cylinder.

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