Device for recovering natural gas diffused by urban gas pipeline

Abstract

The utility model discloses a device for recovering natural gas diffused by an urban gas pipeline, which comprises an inlet quick connector, a filter, a calorific value analyzer, a flow meter, a compressor, a gas cylinder, a pressure regulator and an outlet quick connector, the inlet quick connector is connected to a first valve, the first valve is connected to the filter, the filter is connected to a second valve, and the second valve is connected to a third valve. A heat value analyzer is connected between the filter and the second valve, the second valve is connected to a flow meter, the flow meter is connected to a compressor, the compressor is connected to a gas cylinder through a first pipeline, the gas cylinder is connected to a pressure regulator through a third valve, and the compressor is connected with a second pipeline. The second pipeline and the pressure regulator are connected to a fourth valve, and the fourth valve is connected to an outlet quick connector. The device can effectively solve the problems of diffused natural gas recovery and emergency gas supply in the pressure stopping and reducing operation process of the urban gas medium-pressure or higher pressure level pipe network.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas recovery, in particular to a device for recovering natural gas released from a town gas pipeline. Background Art

[0002] In the operation and management of urban natural gas pipeline networks, there is a common phenomenon of natural gas release during overhaul, emergency repair and maintenance, and there are problems with emergency gas supply during the overhaul and repair process. At present, the overhaul and emergency repair of urban gas pipeline networks basically adopt the method of direct release, which not only causes energy waste and environmental pollution, but also easily causes major safety accidents such as fire and explosion. The recovery and utilization of overhaul and emergency repair gas has good economic and social benefits.

[0003] The existing natural gas recovery technology is mainly based on two methods. One is to compress the released natural gas with a compressor and then store it; the other is to absorb the released natural gas and then store it. Patent application number 201721295558.2 discloses a mobile released natural gas recovery device, which uses a small car equipped with a compressor to recover the released natural gas and pressurize it and directly inject it into the downstream pipeline. The device has no storage function.

[0004] The patent with application number 202023093917.0 discloses a natural gas release and recovery device, including storage tanks, compressors and other equipment, which is suitable for LNG filling stations or gasification stations; when in use, the device is connected to the natural gas system safety valve, and the natural gas enters the storage tank for storage.

[0005] At present, the application focus of natural gas recovery technology is mainly on long-distance pipelines. It is only applicable to application scenarios with large natural gas flow and high pressure, and cannot be well applied to the situation where the natural gas flow and pressure are small in urban gas pipelines. At present, the cost of natural gas recovery technology is relatively high, and it has high requirements for working space and supporting facilities. At present, natural gas recovery technology has high requirements for the release continuity and stability of natural gas release sources, but the release of natural gas from urban gas pipelines has the characteristics of short release time and variable release conditions. The existing natural gas recovery technology cannot be well applied to the release of natural gas from urban gas pipelines. Utility Model Content

[0006] The utility model aims to provide a device for recovering the released natural gas from town gas pipelines, so as to solve the problem of recovering the released natural gas and providing emergency gas during the shutdown and pressure reduction operation of town gas medium-pressure and above pressure level pipelines.

[0007] The utility model provides a device for recovering natural gas released from a town gas pipeline, comprising: an inlet quick connector, a filter, a calorific value analyzer, a flow meter, a compressor, a gas cylinder, a pressure regulator and an outlet quick connector. The inlet quick connector is connected to a first valve, the first valve is connected to the filter, the filter is connected to a second valve, a calorific value analyzer is connected between the filter and the second valve, the second valve is connected to the flow meter, the flow meter is connected to the compressor, the compressor is connected to the gas cylinder through a first pipeline, the gas cylinder is connected to the pressure regulator through a third valve, the compressor is connected to a second pipeline, the second pipeline and the pressure regulator are connected to a fourth valve, and the fourth valve is connected to the outlet quick connector.

[0008] Furthermore, the calorific value analyzer is connected to the pipeline between the filter and the second valve through the fifth valve.

[0009] Furthermore, the first pipeline is connected to the gas cylinder through a sixth valve, and the gas cylinder is connected to the third valve through a seventh valve.

[0010] Furthermore, the gas cylinder is connected to a deflation pipeline, and an eighth valve is provided on the deflation pipeline.

[0011] Furthermore, the compressor is connected to the second pipeline through a ninth valve.

[0012] Furthermore, the filter, calorific value analyzer, flow meter, compressor, gas cylinder and pressure regulator are all arranged on the movable chassis through a skid-mounted structure.

[0013] The utility model has the following beneficial effects: the device for recovering natural gas released from urban gas pipelines of the utility model is suitable for scenarios such as small flow rate and low pressure of released natural gas, which expands the application scenarios of the released natural gas recovery device. The device adopts a skid-mounted design, which has the advantages of low cost, low operating cost, and flexible mobility. The device is provided with a storage gas cylinder, which can store the released natural gas. Compared with the previous released natural gas recovery device, the device avoids the problem that the recovered natural gas must be immediately injected into the pipeline network, and has higher flexibility in use. Once the closed buried valve cannot be opened, the device can serve as an emergency gas source to supply gas to the pipeline network downstream of the valve. At present, natural gas recovery technology has high requirements on the release continuity and stability of the natural gas release source; the released natural gas from urban gas pipelines has the characteristics of short release time and variable release conditions. The device effectively solves the above problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 This is a structural diagram of a device for recovering natural gas released from a town gas pipeline provided by the utility model. DETAILED DESCRIPTION

[0016] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those of ordinary skill in the art to which the present application belongs.

[0017] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0018] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for clarity, the thickness of the layers and regions is enlarged, and the same reference numerals are used to represent the same devices, so their description will be omitted.

[0019] See also Figure 1The utility model provides a device for recovering natural gas released from a town gas pipeline, comprising: an inlet quick connector 1, a filter 3, a calorific value analyzer 4, a flow meter 6, a compressor 7, a gas cylinder 9, a pressure regulator 12 and an outlet quick connector 14.

[0020] Among them, the inlet quick connector 1 is connected to the first valve 2, and the first valve 2 is connected to the filter 3. The filter 3 is used to filter impurities to ensure that the quality meets the requirements. The filter 3 is connected to the second valve 5. A calorific value analyzer 4 is connected between the filter 3 and the second valve 5. The calorific value analyzer 4 is used to measure the calorific value of natural gas. Only when the calorific value of natural gas reaches the established standard can the subsequent process continue. The second valve 5 is connected to the flow meter 6. The natural gas is accurately measured by the flow meter and then enters the compressor for pressurization. The flow meter 6 is connected to the compressor 7. The compressed natural gas is distributed through two outlet pipes: one pipe transports the natural gas to the gas cylinder for storage; the other pipe is connected to the downstream pipeline network through a flexible metal pipe to directly transport the pressurized natural gas to the downstream system. Specifically: the compressor 7 is connected to the gas cylinder 9 through the first pipeline 8, and the gas cylinder 9 is connected to the pressure regulator 12 through the third valve 11. The compressor 7 is connected to the second pipeline 10, and the second pipeline 10 and the pressure regulator 12 are connected to the fourth valve 13, and the fourth valve 13 is connected to the outlet quick connector 14.

[0021] Specifically, the calorific value analyzer 4 is connected to the pipeline between the filter 3 and the second valve 5 through the fifth valve 15. The first pipeline 8 is connected to the gas cylinder 9 through the sixth valve 16, and the gas cylinder 9 is connected to the third valve 11 through the seventh valve 17. The gas cylinder 9 is connected to the deflation pipeline 18, and the eighth valve 19 is arranged on the deflation pipeline 18. The compressor 7 is connected to the second pipeline 10 through the ninth valve 20. The device can recover, store and inject the released natural gas into the downstream pipeline network. Once the valve is closed and cannot be opened, the device can serve as an emergency gas source to supply gas to the downstream of the valve.

[0022] Specifically, the filter 3, calorific value analyzer 4, flow meter 6, compressor 7, gas cylinder 9 and pressure regulator 12 are all arranged on a movable chassis through a skid-mounted structure, which has the advantages of low cost, low operating cost and flexible movement.

[0023] The specific use process of the device for recovering natural gas released from town gas pipelines of the utility model is as follows:

[0024] 1) Connect

[0025] When performing the stop and pressure reduction operation, a flexible metal pipe is used to connect the relief port of the buried valve to the inlet quick connector 7 of the device. Then the relief valve is opened to allow natural gas to enter the device through the relief port.

[0026] Stop and reduce pressure operation process: designate a point in a pipeline in the gas pipeline network as the operation point; around this point, close several valves and pressure regulating stations in the pipeline network to form a closed area around the operation point. Select a closed valve, open the release valve, vent the natural gas in the closed area, and then perform related operations. After the operation is completed, open the relevant valves and pressure regulating stations to resume gas supply.

[0027] 2) Filtration and calorific value determination

[0028] After the natural gas enters the device, it first passes through the filter 1 to filter out impurities to ensure that the quality meets the requirements. Then, the gas flows through the calorific value analyzer 4 for calorific value measurement. Only when the calorific value of the natural gas reaches the established standard can the subsequent process continue.

[0029] 3) Metering and compression

[0030] After the calorific value meets the requirements, the second valve 5 in front of the flow meter 6 is opened, the natural gas is accurately measured through the flow meter, and then enters the compressor for pressurization.

[0031] 4) Gas storage and transportation

[0032] The compressed natural gas is distributed through two outlet pipelines: one pipeline transports the natural gas to gas cylinders for storage; the other pipeline is connected to the downstream pipeline network through a flexible metal pipe, directly transporting the pressurized natural gas to the downstream system.

[0033] 5) Pressure regulation and pipeline transportation

[0034] The natural gas in the gas cylinder is pressure-regulated by the pressure regulator 12 to meet the requirements of pipeline transportation, and then transported to the downstream pipeline through the device outlet.

[0035] 6) Treatment of unqualified gas

[0036] If it is detected that the calorific value of the natural gas does not meet the requirements, it will be vented through the relief valve at the front end of the device to ensure the safety and efficiency of the device.

[0037] It can be seen from the above embodiments that the device for recovering natural gas released from urban gas pipelines of the utility model is suitable for scenarios such as small flow rate and low pressure of released natural gas, which expands the application scenarios of the released natural gas recovery device. The device adopts a skid-mounted design, which has the advantages of low cost, low operating cost, and flexible mobility. The device is provided with a storage gas cylinder that can store the released natural gas. Compared with previous released natural gas recovery devices, the present device avoids the problem that the recovered natural gas must be immediately injected into the pipeline network, and has higher flexibility in use. Once the closed buried valve cannot be opened, the present device can serve as an emergency gas source to supply gas to the pipeline network downstream of the valve. At present, natural gas recovery technology has high requirements on the release continuity and stability of the natural gas release source; the released natural gas from urban gas pipelines has the characteristics of short release time and variable release conditions. The present device effectively solves the above problems.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0040] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. 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 device for recovering natural gas released from a town gas pipeline, characterized in that: include: An inlet quick connector (1), a filter (3), a calorific value analyzer (4), a flow meter (6), a compressor (7), a gas cylinder (9), a pressure regulator (12), and an outlet quick connector (14); The inlet quick connector (1) is connected to a first valve (2), the first valve (2) is connected to a filter (3), the filter (3) is connected to a second valve (5), a calorific value analyzer (4) is connected between the filter (3) and the second valve (5), the second valve (5) is connected to a flow meter (6), the flow meter (6) is connected to a compressor (7), the compressor (7) is connected to a gas cylinder (9) via a first pipeline (8), the gas cylinder (9) is connected to a pressure regulator (12) via a third valve (11), the compressor (7) is connected to a second pipeline (10), the second pipeline (10) and the pressure regulator (12) are connected to a fourth valve (13), and the fourth valve (13) is connected to an outlet quick connector (14).

2. A device for recovering natural gas released from a town gas pipeline as claimed in claim 1, characterized in that: The calorific value analyzer (4) is connected to the pipeline between the filter (3) and the second valve (5) via the fifth valve (15).

3. The device for recovering natural gas released from a town gas pipeline according to claim 1, characterized in that: The first pipeline (8) is connected to the gas cylinder (9) via a sixth valve (16), and the gas cylinder (9) is connected to the third valve (11) via a seventh valve (17).

4. The device for recovering natural gas released from a town gas pipeline according to claim 1, characterized in that: The gas cylinder (9) is connected to a deflation pipeline (18), and an eighth valve (19) is provided on the deflation pipeline (18).

5. The device for recovering natural gas released from a town gas pipeline as claimed in claim 1, characterized in that: The compressor (7) is connected to the second pipeline (10) via a ninth valve (20).

6. The device for recovering natural gas released from a town gas pipeline as claimed in claim 1, characterized in that: The filter (3), calorific value analyzer (4), flow meter (6), compressor (7), gas cylinder (9) and pressure regulator (12) are all arranged on a movable chassis via a skid-mounted structure.

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