Nitrogen replacement device for pressurized plugging rectification of natural gas pipeline

Abstract

The utility model provides a nitrogen replacement device for pressurized plugging rectification of a natural gas pipeline, which comprises an upstream plugging valve and a downstream plugging valve which are arranged at two ends of a pipeline section to be rectified; an upstream tee joint and a downstream tee joint; an upstream four-way joint and a downstream four-way joint; an upstream rectification valve; a downstream rectification valve; a natural gas bypass; two bypass valves; the first nitrogen replacement mechanism is arranged on the natural gas bypass; the second nitrogen replacement mechanism is arranged on the to-be-rectified pipeline section; the natural gas supplementing pipeline is arranged between the downstream four-way joint and the natural gas bypass; and the supplement pump and the supplement valve are arranged on the natural gas supplement pipeline. The natural gas pipeline and the natural gas bypass can be subjected to nitrogen replacement, so that existing natural gas in the pipeline can be transferred into the natural gas bypass, the interruption time of the whole gas conveying pipeline is shortened, and waste of resources is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to long -distance natural gas field, especially relate to a kind of nitrogen replacement device for natural gas pipeline pressure plugging rectification. BACKGROUND

[0002] Long -distance natural gas pipeline will be in the process of overhaul and rectification, the natural gas stored in pipeline is directly discharged to atmosphere, causing resource waste, and also damaging environment.Usually spare branch is set on the side, if the existing natural gas in pipeline can be transferred to spare branch for subsequent overhaul and rectification, energy can be greatly saved. INVENTION CONTENTS

[0003] One purpose of the utility model is to provide a kind of nitrogen replacement device for natural gas pipeline pressure plugging rectification, and provide at least the advantages to be explained later.

[0004] Another purpose of the utility model is to provide a kind of nitrogen replacement device for natural gas pipeline pressure plugging rectification, nitrogen replacement can be carried out to natural gas pipeline and natural gas bypass, so that the existing natural gas in pipeline can be transferred to natural gas bypass, shorten the time of entire gas pipeline interruption, and resource waste can not be caused.

[0005] The technical scheme of the utility model is as follows:

[0006] The nitrogen replacement device for natural gas pipeline pressure plugging rectification includes:

[0007] Upstream block valve and downstream block valve are arranged at the two ends of the pipeline section to be rectified;

[0008] Upstream tee and downstream tee are arranged at the downstream position of the upstream block valve and the upstream position of the downstream block valve on the pipeline section to be rectified;

[0009] Upstream cross and downstream cross are arranged at the downstream position of the upstream tee and the upstream position of the downstream tee on the pipeline section to be rectified respectively;

[0010] Upstream rectification valve is arranged between the upstream tee and the upstream cross;

[0011] Downstream rectification valve is arranged between the downstream tee and the downstream cross;

[0012] Natural gas bypass is connected with the upstream tee and the downstream tee at two ends, and the two ends of the natural gas bypass are respectively provided with exhaust port, and exhaust valve is arranged on the exhaust port;

[0013] Two bypass valves, which are respectively arranged at two ends of the natural gas bypass and are located at positions of the exhaust port close to the upstream three-way joint and the downstream three-way joint;

[0014] A first nitrogen replacement mechanism arranged on the natural gas bypass;

[0015] A second nitrogen replacement mechanism arranged on the pipeline segment to be rectified;

[0016] A natural gas supplement pipeline arranged between the downstream four-way joint and the natural gas bypass;

[0017] A supplement pump and a supplement valve arranged on the natural gas supplement pipeline.

[0018] Preferably, the nitrogen replacement device for the natural gas pipeline pressure sealing rectification further comprises a natural gas recovery mechanism arranged on the downstream four-way joint.

[0019] Preferably, the nitrogen replacement device for the natural gas pipeline pressure sealing rectification further comprises a nitrogen secondary utilization pipeline arranged between the upstream four-way joint and the natural gas bypass.

[0020] Preferably, the nitrogen secondary utilization pipeline is provided with a secondary utilization valve and a secondary utilization pump.

[0021] The present application has the following advantages:

[0022] The upstream sealing valve and the downstream sealing valve can seal the pipeline segment to be rectified, so that subsequent operations do not affect other pipelines.

[0023] The combination of the upstream three-way joint and the downstream three-way joint, the upstream four-way joint and the downstream four-way joint, and the upstream rectification valve and the downstream rectification valve makes each stage of the whole process controllable, and the nitrogen replacement and natural gas transfer operations are safer.

[0024] Other advantages, objects and features of the present application will be apparent to those skilled in the art from the following description, and will be understood by those skilled in the art upon reading and understanding the specification. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The present application provides a structure diagram of an embodiment of the nitrogen replacement device for the natural gas pipeline pressure sealing rectification. DETAILED DESCRIPTION

[0026] The present application will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement the present application according to the specification.

[0027] It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0028] As shown in Figure 1 The utility model provides a kind of nitrogen replacement device for natural gas pipeline pressure plugging rectification, it includes:

[0029] Upstream plugging valve 1 and downstream plugging valve 2 are arranged at the two ends of the pipeline segment 3 to be rectified;

[0030] Upstream tee 4 and downstream tee 5 are arranged at the downstream position of the upstream plugging valve 1 and the upstream position of the downstream plugging valve 2 on the pipeline segment 3 to be rectified;

[0031] Upstream cross 6 and downstream cross 7 are arranged at the downstream position of the upstream tee 4 and the upstream position of the downstream tee 5 on the pipeline segment 3 to be rectified respectively;

[0032] Upstream rectification valve 8 is arranged between the upstream tee 4 and the upstream cross 6;

[0033] Downstream rectification valve 9 is arranged between the downstream tee 5 and the downstream cross 7;

[0034] Natural gas bypass 10 is connected with the upstream tee 4 and the downstream tee 5 at both ends, and both ends of the natural gas bypass 10 are respectively provided with an exhaust port 11, and the exhaust valve 12 is arranged on the exhaust port 11;

[0035] Two bypass valves 13 are arranged at both ends of the natural gas bypass 10 and located at the position close to the upstream tee 4 and the downstream tee 5 of the exhaust port 11;

[0036] First nitrogen replacement mechanism 14 is arranged on the natural gas bypass 10;

[0037] Second nitrogen replacement mechanism 15 is arranged on the pipeline segment 3 to be rectified;

[0038] Natural gas supplement pipeline 16 is arranged between the downstream cross 7 and the natural gas bypass 10;

[0039] Supplement pump 17 and supplement valve 18 are arranged on the natural gas supplement pipeline 16.

[0040] The working process of the utility model is as follows:

[0041] First, close the upstream plugging valve and the downstream plugging valve at both ends, interrupt the entire gas pipeline, then close the upstream rectification valve and the downstream rectification valve;

[0042] Secondly, open the first nitrogen replacement mechanism and the exhaust valve on the natural gas bypass, replace the air in the natural gas bypass with nitrogen, and close the first nitrogen replacement mechanism after completion;

[0043] After that, open the second nitrogen replacement mechanism and the supplement pump and the supplement valve on the natural gas supplement pipeline, the natural gas enters the natural gas bypass from the pipeline segment to be rectified, while the nitrogen is supplemented into the pipeline segment to be rectified, and the nitrogen in the natural gas bypass is discharged to the air through the exhaust port, and the exhaust valve, the supplement pump and the supplement valve are closed after the natural gas transfer is completed; the second nitrogen replacement mechanism is closed after the nitrogen supplement is completed;

[0044] Finally, open the bypass valve, the upstream blocking valve and the downstream blocking valve, and the natural gas is transmitted through the natural gas bypass; subsequent operations are performed on the pipeline to be rectified.

[0045] Regarding the first nitrogen replacement mechanism and the second nitrogen replacement mechanism, existing replacement devices can be used, and those skilled in the art can select different equipment according to actual conditions, which need not be described in detail here.

[0046] Regarding the installation of the tee, the cross and various valves, it is a routine operation of those skilled in the art during rectification, which will not be explained here.

[0047] In an embodiment of the nitrogen replacement device for the natural gas pipeline pressure blocking rectification provided by the utility model, the downstream cross 7 is further provided with a natural gas recovery mechanism 19, which can recover natural gas when the natural gas bypass is not laid, avoiding waste of natural gas.

[0048] In an embodiment of the nitrogen replacement device for the natural gas pipeline pressure blocking rectification provided by the utility model, the upstream cross 6 and the natural gas bypass 10 are further provided with a nitrogen secondary utilization pipeline 20, which can return the nitrogen in the natural gas bypass to the pipeline segment to be rectified, realizing secondary utilization.

[0049] In an embodiment of the nitrogen replacement device for the natural gas pipeline pressure blocking rectification provided by the utility model, the nitrogen secondary utilization pipeline 20 is provided with a secondary utilization valve 21 and a secondary utilization pump 22, facilitating adjustment of the flow of the secondary utilization of nitrogen.

[0050] In the entire device, pressure gauges, gas sensors and the like are arranged to detect the pressure in the pipeline and the content of nitrogen and natural gas and the like, and the installation and distribution of these devices also belong to the conventional technical means in the art, which need not be described here.

[0051] Although the embodiments of the present application have been disclosed as above, it is not limited to the application listed in the specification and the embodiments, and it can be applied to various fields suitable for the present application. For those skilled in the art, other modifications can be easily realized, and therefore the present application is not limited to specific details and the figures shown and described herein.

Claims

1. A nitrogen replacement device for natural gas pipeline pressure-containing plugging rectification, characterized in that, The application relates to a natural gas pipeline rectification device. The device comprises: an upstream blocking valve and a downstream blocking valve arranged at two ends of a pipeline section to be rectified; an upstream tee and a downstream tee arranged at downstream of the upstream blocking valve and upstream of the downstream blocking valve on the pipeline section to be rectified; an upstream cross and a downstream cross arranged at downstream of the upstream tee and upstream of the downstream tee on the pipeline section to be rectified respectively; an upstream rectification valve arranged between the upstream tee and the upstream cross; a downstream rectification valve arranged between the downstream tee and the downstream cross; a natural gas bypass connected with the upstream tee and the downstream tee at two ends and provided with exhaust ports at the two ends respectively, wherein exhaust valves are arranged on the exhaust ports; two bypass valves arranged at the two ends of the natural gas bypass respectively and located close to the upstream tee and the downstream tee; a first nitrogen replacement mechanism arranged on the natural gas bypass; a second nitrogen replacement mechanism arranged on the pipeline section to be rectified; a natural gas supplement pipeline arranged between the downstream cross and the natural gas bypass; 2. The nitrogen displacement device for natural gas pipeline pressure containment plugging remediation of claim 1, wherein, a supplement pump and a supplement valve arranged on the natural gas supplement pipeline.

3. The nitrogen displacement device for in-service plugging and remediation of natural gas pipelines as claimed in claim 2, wherein, A natural gas recovery mechanism is further arranged on the downstream cross.

4. The nitrogen displacement device for natural gas pipeline pressure containment plugging remediation of claim 3, wherein, A nitrogen secondary utilization pipeline is further arranged between the upstream cross and the natural gas bypass. A secondary utilization valve and a secondary utilization pump are arranged on the nitrogen secondary utilization pipeline.

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