A gas extraction system employs a flow monitoring device.

Abstract

This utility model belongs to the field of gas flow monitoring technology, specifically relating to a gas extraction flow monitoring device, including an orifice plate connector. Two measuring tubes are installed on the top of the orifice plate connector, and the tops of the two measuring tubes are respectively connected to a control valve. In this utility model, a first and second insulation sleeve are fitted onto the corresponding measuring tubes. Then, the inlet and outlet heads on the first insulation sleeve are connected to an external water supply pipe and a recovery pipe, respectively. During use, warm water at 30-35°C is added to the first insulation sleeve. The warm water enters the first insulation sleeve and then flows into the second insulation sleeve through a connecting pipe. In this way, the first and second insulation sleeves transfer heat to the measuring tubes, thus maintaining the measuring tubes at approximately 30-35°C even in cold environments. When measuring gas flow during gas extraction, the warm environment inside the measuring tubes prevents an increase in gas density, thereby improving the accuracy of the differential pressure transmitter's final measurement.

Description

Technical Field

[0001] This utility model belongs to the field of gas flow monitoring technology, specifically relating to a gas extraction flow monitoring device. Background Technology

[0002] In gas drainage systems, orifice plate flow monitors serve as core flow metering devices, and their measurement accuracy directly impacts gas drainage efficiency assessment and safe production management. However, when the equipment is in sub-zero cold environments (such as underground working faces in northern winters or open-pit drainage stations in high-altitude mining areas), measurement deviations are highly likely to occur. The core influencing factors can be deduced step-by-step from changes in the temperature of the detection tube:

[0003] Cold environments can cause the temperature of the detector's sensing tube to drop below freezing. Since the sensing tube is in direct contact with the external low-temperature environment, its temperature drops significantly. When methane gas enters the sensing tube from the extraction pipeline, the low temperature significantly slows down the thermal motion rate of gas molecules, reducing the distance between molecules and resulting in a marked decrease in the actual density of the methane. Ultimately, this leads to larger errors in the differential pressure transmitter's detection data. Utility Model Content

[0004] The purpose of this invention is to provide a gas extraction flow monitoring device, aiming to solve the problem that cold environments cause the temperature of the detector tube to continuously drop below freezing. Because the detector tube is in direct contact with the external low-temperature environment, its temperature drops significantly. When gas enters the detector tube from the extraction pipeline, the low temperature significantly slows down the thermal motion rate of gas molecules, reducing the intermolecular distance and resulting in a significant decrease in the actual gas density. This ultimately leads to a large error in the differential pressure transmitter's detection data.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a gas extraction flow monitoring device, including an orifice plate connector, the top of the orifice plate connector being connected to two measuring tubes, the top ends of the two measuring tubes being respectively connected to a control valve, the tops of the two control valves being installed at the bottom of a differential pressure transmitter, and a first heat insulation sleeve being fitted onto the outer wall of one of the measuring tubes;

[0006] Another measuring tube is fitted with a second insulation sleeve on its outer wall. The first and second insulation sleeves have internal cavities. Two connecting tubes are connected in parallel between the first and second insulation sleeves, and the two ends of the connecting tubes are respectively connected to the internal cavities of the first and second insulation sleeves.

[0007] In order to keep the measuring tube within the normal temperature range in cold environments, as a gas extraction flow monitoring device of this utility model, preferably, a bottom groove is formed on the inner wall of the first and second insulation sleeves near the bottom, and a sealing groove is also formed on the inner wall below the bottom groove of the first and second insulation sleeves.

[0008] The bottom groove is equipped with absorbent cotton, and the sealing groove is equipped with a sealing ring.

[0009] In order to prevent water droplets formed on the surface of the measuring tube from dripping directly onto the orifice plate joint, as a gas extraction flow monitoring device of this utility model, preferably, the inner walls of the first and second insulation sleeves are in close contact with the outer walls of the corresponding measuring tubes, and both the first and second insulation sleeves are made of stainless steel.

[0010] The inner walls of the sealing ring and the absorbent cotton are in contact with the outer walls of the corresponding measuring tubes, wherein the inner and outer walls of the sealing ring and the connecting end of the measuring tube and the sealing groove form a sealing structure.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] The first and second insulation jackets are pre-assembled and fitted onto the corresponding measuring tubes. Then, the inlet and outlet heads on the first insulation jacket are connected to the external water supply and recovery pipes, respectively. During use, warm water at 30-35℃ is added to the first insulation jacket. This warm water enters the first insulation jacket and then flows through the connecting pipe into the second insulation jacket. In this way, the first and second insulation jackets transfer heat to the measuring tubes, allowing the measuring tubes to maintain a temperature of approximately 30-35℃ even in cold environments. When measuring gas flow during gas extraction, the warm environment inside the measuring tubes prevents an increase in gas density, thereby improving the accuracy of the differential pressure transmitter's final measurement. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a schematic diagram of the left-side structure provided in an embodiment of this application.

[0015] Figure 2 This is a schematic diagram of the right-side structure provided for an embodiment of this application.

[0016] Figure 3 This is a schematic diagram of the connecting pipe docking structure provided in an embodiment of this application.

[0017] Figure 4This is a schematic cross-sectional view of the first insulation jacket provided in an embodiment of this application.

[0018] Figure 5 This is a schematic diagram of the bottom groove structure provided in an embodiment of this application.

[0019] In the diagram: 1. Orifice plate connector; 2. Measuring tube; 3. Control valve; 4. Differential pressure transmitter; 5. First insulation sleeve; 51. Inner cavity; 52. Bottom groove; 53. Sealing groove; 54. Sealing ring; 55. Absorbent cotton; 6. Second insulation sleeve; 7. Connecting pipe. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-5 The present invention provides the following technical solution: a gas extraction flow monitoring device, including an orifice plate connector 1, two measuring tubes 2 are installed on the top of the orifice plate connector 1, the top ends of the two measuring tubes 2 are respectively connected to a control valve 3, the tops of the two control valves 3 are installed at the bottom of a differential pressure transmitter 4, and a first heat insulation sleeve 5 is fitted on the outer wall of one measuring tube 2.

[0022] Another measuring tube 2 is fitted with a second insulation sleeve 6 on its outer wall. The first insulation sleeve 5 and the second insulation sleeve 6 have an inner cavity 51. Two connecting tubes 7 are connected in parallel between the first insulation sleeve 5 and the second insulation sleeve 6, and the two ends of the connecting tubes 7 are respectively connected into the inner cavity 51 of the first insulation sleeve 5 and the second insulation sleeve 6. A water inlet and a water outlet are provided on one side of the first insulation sleeve 5.

[0023] In use, the two ends of the orifice plate connector 1 are connected to the gas extraction and delivery pipeline. During monitoring, when the gas flows through the orifice plate connector 1, the flow difference formed on both sides of the orifice plate connector 1 is captured by the two measuring tubes 2. The data captured by the measuring tubes 2 is transmitted to the differential pressure transmitter 4, so the differential pressure transmitter 4 can display the gas flow rate in the pipeline.

[0024] Preferably, a bottom groove 52 is provided on the inner wall of the first insulation sleeve 5 and the second insulation sleeve 6 near the bottom, and a sealing groove 53 is also provided on the inner wall below the bottom groove 52 of the first insulation sleeve 5 and the second insulation sleeve 6.

[0025] The bottom groove 52 is equipped with absorbent cotton 55, and the sealing groove 53 is equipped with a sealing ring 54.

[0026] Preferably, the inner walls of the first insulation sleeve 5 and the second insulation sleeve 6 are in close contact with the outer wall of the corresponding measuring tube 2, and both the first insulation sleeve 5 and the second insulation sleeve 6 are made of stainless steel.

[0027] The inner walls of the sealing ring 54 and the absorbent cotton 55 are in contact with the outer wall of the corresponding measuring tube 2, wherein the inner and outer walls of the sealing ring 54 form a sealing structure with the connecting end of the measuring tube 2 and the sealing groove 53.

[0028] In practical use, when the first insulation sleeve 5 and the second insulation sleeve 6 heat the measuring tube 2 in a cold environment, a certain amount of water droplets will be generated on the outer wall of the measuring tube 2. The generated water droplets flow down along the outer wall of the measuring tube 2. When the water droplets flow to the vicinity of the absorbent cotton 55, the absorbent cotton 55 will absorb the water droplets, thereby preventing the water droplets from dripping onto the orifice plate connector 1.

[0029] The sealing ring 54 forms an effective sealing structure at the joint between the first insulation sleeve 5 or the second insulation sleeve 6 and the measuring tube 2, which can further prevent water droplets from falling and thus ensure the integrity of the above structure.

[0030] The first insulation sleeve 5 and the second insulation sleeve 6 are pre-assembled and fitted onto the corresponding measuring tube 2. Then, the inlet and outlet heads on the first insulation sleeve 5 are connected to the external water supply and recovery pipes. During use, warm water at 30-35°C is added to the first insulation sleeve 5. This warm water enters the first insulation sleeve 5 and then flows through the connecting pipe 7 into the second insulation sleeve 6. In this way, the first and second insulation sleeves 5 and 6 transfer heat to the measuring tube 2, allowing the measuring tube 2 to maintain a temperature of approximately 30-35°C even in cold environments. When measuring the gas flow rate during gas extraction, the warm environment within the measuring tube 2 prevents an increase in gas density, thereby improving the accuracy of the final measurement by the differential pressure transmitter 4.

[0031] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A gas extraction flow monitoring device comprising an orifice adapter (1), the top of the orifice adapter (1) is connected with two measuring pipes (2), the top of the two measuring pipes (2) is respectively connected with a control valve (3), the top of the two control valves (3) is installed at the bottom of a differential pressure transmitter (4), characterized in that, A first heat-insulating sleeve (5) is fitted onto the outer wall of one of the measuring tubes (2); Another measuring tube (2) is fitted with a second heat insulation sleeve (6) on its outer wall. The first heat insulation sleeve (5) and the second heat insulation sleeve (6) have an inner cavity (51) inside. Two connecting tubes (7) are connected in parallel between the first heat insulation sleeve (5) and the second heat insulation sleeve (6), and the two ends of the connecting tubes (7) are respectively connected to the inner cavities (51) of the first heat insulation sleeve (5) and the second heat insulation sleeve (6).

2. The gas extraction flow monitoring device according to claim 1, characterized in that: The first insulation sleeve (5) and the second insulation sleeve (6) have bottom grooves (52) on their inner walls near the bottom, and sealing grooves (53) are also provided on the inner walls below the bottom grooves (52) of the first insulation sleeve (5) and the second insulation sleeve (6).

3. A gas extraction flow monitoring device according to claim 2, characterized in that: The bottom groove (52) is equipped with absorbent cotton (55), and the sealing groove (53) is equipped with a sealing ring (54).

4. A gas extraction flow monitoring device according to claim 1, characterized in that: The inner walls of the first insulation sleeve (5) and the second insulation sleeve (6) are in close contact with the outer wall of the corresponding measuring tube (2). The first insulation sleeve (5) and the second insulation sleeve (6) are both made of stainless steel.

5. A gas extraction flow monitoring device according to claim 3, characterized in that: The inner walls of the sealing ring (54) and the absorbent cotton (55) are in contact with the outer wall of the corresponding measuring tube (2), wherein the inner and outer walls of the sealing ring (54) form a sealing structure with the connecting end of the measuring tube (2) and the sealing groove (53).

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