Component-adjustable sound velocity measuring device for hydrogen-rich natural gas mixture

Abstract

The utility model provides a component-adjustable hydrogen-rich natural gas mixture sound velocity measuring device which comprises a vacuum chamber and a gas distribution unit, a gas outlet of a gas mixer in the gas distribution unit is connected with an inlet pipeline extending into the vacuum chamber, and two flanges which are oppositely arranged are arranged in the vacuum chamber. Supporting rods fixed to the inner wall of the vacuum chamber are connected into a plurality of fixing holes in the peripheries of the two flanges through bolts, pressure pipelines are fixed to the opposite inner sides of the two flanges, and a thermometer, a pressure meter and two oppositely-arranged heat exchangers are arranged on the inner walls of the pressure pipelines. The outer wall of the pressure pipeline is provided with a fixed guide rail which enables a transducer of an external clamping type gas ultrasonic flowmeter for measuring the sound velocity of gas to be tightly attached to the outer wall of the pressure pipeline, and the inner end of the inlet pipeline, a center hole of the flange, the pressure pipeline and the outlet pipeline are sequentially connected in a sealed mode. And cold / hot fluid inlet and outlet pipelines which extend into the vacuum chamber and are communicated with each other are arranged on two sides of the outlet pipeline. The device can measure the sound velocity in the hydrogen-rich natural gas mixture.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas flow measurement detection technical field, concretely relates to a kind of component adjustable hydrogen-rich natural gas mixture sound velocity measuring device. BACKGROUND

[0002] With the advance of China's "double carbon" strategy, increasing hydrogen content in natural gas to reduce carbon emissions is an important way to achieve energy transformation in the gas field. However, with the increase of hydrogen content in natural gas pipeline network, the heterogeneity of the thermodynamic properties of hydrogen-rich mixture will also become more and more significant. Currently, AGA-8 and AGA-10 models are widely used internationally as the standard for calculating the properties of gaseous natural gas and similar mixtures, but the hydrogen content is limited to 10 mol%. Considering the important influence of the thermodynamic properties of hydrogen-rich mixture on gas flow measurement and gas trade settlement, it is likely that the hydrogen content in natural gas will exceed 10 mol% in the future. Under these conditions, the thermodynamic properties of high-hydrogen-content mixture need to be accurately measured to verify or correct the model calculation. In the verification process, the sound velocity measurement of hydrogen-rich mixed gas is the most critical parameter, as it is one of the most useful properties needed to achieve accurate equation of state and density, pressure and specific heat. Timely revealing the changes in the sound velocity of hydrogen-rich mixed gas can timely correct the flow measurement value.

[0003] However, due to the low density and high diffusion rate of hydrogen, current traditional flow measurement methods including orifice flowmeter and turbine flowmeter often have inaccurate flow readings and low measurement efficiency when applied to hydrogen-rich mixtures. Therefore, non-intrusive flow measurement methods of ultrasonic flowmeter need to be used to experimentally measure the sound velocity of hydrogen-rich gas mixture. UTILITY MODEL CONTENT

[0004] To solve the problem of inaccurate flow readings and low measurement efficiency of current traditional flow measurement methods including orifice flowmeter and turbine flowmeter when applied to hydrogen-rich mixtures, non-intrusive flow measurement methods of ultrasonic flowmeter are needed to measure the sound velocity of hydrogen-rich mixture, which requires the use of specific facilities or instruments compatible with hydrogen. Based on this purpose, the utility model provides a kind of component adjustable hydrogen-rich natural gas mixture sound velocity measuring device, which can be used to measure the sound velocity of hydrogen-rich natural gas mixture with different medium components. The device uses an external clamp-on gas ultrasonic flowmeter as a measuring instrument, which can maintain stable and controllable temperature and pressure and other thermodynamic conditions during the entire measurement process, thereby ensuring accurate results from the perspective of metrology.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] The application discloses a sound velocity measuring device for hydrogen-rich natural gas mixture with adjustable components, which comprises a vacuum chamber and a gas distribution unit, wherein the gas distribution unit comprises a gas mixer and an online chromatographic analyzer in communication with the gas mixer; an inlet pipeline is connected to the gas outlet of the gas mixer and extends into the vacuum chamber; a first flange and a second flange are oppositely arranged in the vacuum chamber; support rods are connected to a plurality of fixing holes around the first flange and the second flange by bolts; the outer ends of the support rods are fixed to the inner wall of the vacuum chamber; a pressure pipeline is fixed to the opposite inner sides of the first flange and the second flange; a thermometer and a pressure gauge and two heat exchangers are arranged on the inner wall of the pressure pipeline; a fixing guide rail is arranged on the outer wall of the pressure pipeline; a transducer of an outer clamp type gas ultrasonic flowmeter for measuring the sound velocity of the gas is tightly arranged on the outer wall of the pressure pipeline; the inner end of the inlet pipeline extending into the vacuum chamber is sealingly connected to the outer end of the central hole of the first flange; the gas inlet of the pressure pipeline is sealingly connected to the inner end of the central hole of the first flange; the gas outlet of the pressure pipeline is sealingly connected to the inner end of the central hole of the second flange; the outer end of the central hole of the second flange is sealingly connected to an outlet pipeline extending out of the vacuum chamber; a cold / hot fluid inlet pipeline and a cold / hot fluid outlet pipeline extending into the vacuum chamber are arranged on both sides of the outlet pipeline; the inner ends of the cold / hot fluid inlet pipeline and the cold / hot fluid outlet pipeline are in communication with each other outside the first flange; and the outer ends of the cold / hot fluid inlet pipeline and the cold / hot fluid outlet pipeline are connected to an existing cold / hot bath outside.

[0007] Compared with the prior art, the hydrogen-rich natural gas mixture component adjustable sound velocity measuring device provided by the utility model can continuously output the hydrogen-rich natural gas mixture with controllable components, and then the mixed hydrogen-rich natural gas mixture in the gas mixer is injected into the pressure pipeline through the first flange center hole of the inlet pipeline, the temperature and pressure are adjusted to the appropriate working conditions, the hydrogen-rich natural gas mixture is filled in the pressure pipeline, the sound velocity of the hydrogen-rich natural gas mixture in the pressure pipeline is measured by the outer clamping type gas ultrasonic flowmeter, the gas flow can be kept or the pipeline can be closed to make the gas static during the measurement process, the gas is discharged from the outlet pipeline after the measurement is completed, the two heat exchangers independently operated during the measurement process perform fine gas temperature control, the temperature stability can be better than ±0.1℃, meanwhile, the temperature and pressure of the hydrogen-rich natural gas mixture in the pressure pipeline are measured by the thermometer and the pressure gauge, and the temperature in the vacuum chamber is controlled by the cold / hot fluid in the cold / hot fluid inlet and outlet pipelines.

[0008] Further, the gas distribution unit outside the vacuum chamber is provided with a pressure and flow regulating valve.

[0009] Further, the center hole of the first flange and the second flange is sleeved with a Teflon gasket, and the inlet pipeline and the outlet pipeline are sealingly connected with the outer end of the center hole of the flange through the Teflon gasket.

[0010] Further, the pressure pipeline is a stainless steel pipeline, and the inner diameter of the pressure pipeline is 50mm, 100mm or 150mm.

[0011] Further, the outer wall of the pressure pipeline is coated with a coupling, and the transducer of the outer clamping type gas ultrasonic flowmeter is coupled to the outer wall of the pressure pipeline through the coupling. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1It is the structure schematic view of the hydrogen-rich natural gas mixture sound velocity measuring device with adjustable components provided by the utility model.

[0013] Figure 2 It is Figure 1 The structure schematic view of the first flange and the second flange.

[0014] In the figure, 1, vacuum chamber;2, gas mixer;3, inlet pipeline;4, first flange;41, fixed hole;42, center hole;5, second flange;6, support rod;7, pressure pipeline;8, heat exchanger;9, fixed guide rail;10, outer clamping type gas ultrasonic flowmeter;11, outlet pipeline;12, cold / heat fluid inlet pipeline;13, cold / heat fluid outlet pipeline;14, pressure and flow regulating valve;15, coupling. DETAILED DESCRIPTION

[0015] In order to make the technical means, creative features, purposes and effects realized by the utility model easy to understand, the utility model is further described below in combination with specific drawings.

[0016] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0017] In the description of the utility model, it should be explained that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected;Can be mechanical connection, can also be electrical connection;Can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0018] Please refer to Figure 1 And Figure 2The utility model provides a kind of hydrogen-rich natural gas mixture sound velocity measuring device with adjustable component, including vacuum chamber 1 and gas distribution unit, the gas distribution unit includes gas mixer 2 and the on-line chromatographic analyzer (not shown in drawing) with gas mixer internal communication, the specific structure and working principle of gas mixer 2 and on-line chromatographic analyzer are well known prior art to the person skilled in the art, thus no longer repeat here;The gas outlet of gas mixer 2 is connected with inlet pipeline 3 that extends into vacuum chamber 1, first flange 4 and second flange 5 are relatively arranged in vacuum chamber 1, a plurality of fixed holes 41 in the periphery of first flange 4 and second flange 5 are connected with support rod 6 by bolt, the outer end of support rod 6 is fixedly connected with the inner wall of vacuum chamber 1, pressure pipeline 7 is fixed to the opposite inner side of first flange 4 and second flange 5, the inner wall of pressure pipeline 7 is equipped with thermometer T and pressure gauge P and two heat exchangers 8 that are relatively arranged, thermometer T and pressure gauge P are used to measure the temperature and pressure of hydrogen-rich natural gas mixture in pressure pipeline 7, and the measurement uncertainty is ±0.02 DEG C, ±0.025MPa, the two heat exchangers 8 can be arranged on the front inner wall and rear inner wall of pressure pipeline 7, and it is noted that it is staggered with the outer clamp type gas ultrasonic flowmeter 10 arranged on the outer wall of pressure pipeline 7 (the outer clamp type gas ultrasonic flowmeter 10 can be arranged on the left / right outer wall of pressure pipeline 7), the two heat exchangers 8 are used for fine mixed gas temperature control, specifically, existing non-contact heat exchanger can be used to realize, the outer wall of pressure pipeline 7 is equipped with fixed guide rail 9, the transducer of outer clamp type gas ultrasonic flowmeter 10 for measuring gas sound velocity is tightly attached on the outer wall of pressure pipeline 7 by fixed guide rail 9, the outer clamp type gas ultrasonic flowmeter 10 adopts ultrasonic lamb wave transducer, which is used for measuring the sound velocity of mixed gas flowing through pressure pipeline 7, the inner end of inlet pipeline 3 that extends into vacuum chamber 1 is sealingly connected with the outer end of the center hole of first flange 4, the gas inlet of pressure pipeline 7 is sealingly connected with the inner end of the center hole 42 of first flange 4, the gas outlet of pressure pipeline 7 is sealingly connected with the inner end of the center hole 42 of second flange 5, the outer end of the center hole 42 of second flange 5 is sealingly connected with outlet pipeline 11 that extends out of vacuum chamber 1, cold / hot fluid inlet pipeline 12 and cold / hot fluid outlet pipeline 13 that extend into vacuum chamber 1 are arranged on the two sides of outlet pipeline 1, the inner ends of cold / hot fluid inlet pipeline 12 and cold / hot fluid outlet pipeline 13 are communicated with each other outside first flange 4, the outer ends of cold / hot fluid inlet pipeline 12 and cold / hot fluid outlet pipeline 13 are connected with external existing cold / hot bath.In the device, since the aforementioned various hardware is mature hardware, its assembly connection is very easy for the person skilled in the art.

[0019] Compared with the prior art, the component-adjustable hydrogen-rich natural gas mixture sound velocity measuring device provided by the utility model can realize the proportion adjustment of the hydrogen-rich natural gas mixture components in the gas mixer through ultrasonic atomization or vortex stirring and other existing modes, simultaneously corrects the mixing deviation through the feedback control of the online chromatographic analyzer, thereby being capable of continuously outputting the component-controllable hydrogen-rich natural gas mixture, and then the mixed hydrogen-rich natural gas mixture in the gas mixer is injected into the pressure pipeline through the first flange center hole of the inlet pipeline, the temperature and pressure are adjusted to the appropriate working conditions, the hydrogen-rich natural gas mixture is filled in the pressure pipeline, the sound velocity of the hydrogen-rich natural gas mixture in the pressure pipeline is measured through the outer clamping type gas ultrasonic flowmeter, the gas flow can be kept or the pipeline can be closed to make the gas static during the measuring process, the gas is discharged from the outlet pipeline after the measurement is completed, the two heat exchangers independently operated during the measurement process perform fine gas temperature control, the temperature stability can be better than ±0.1℃, meanwhile, the temperature and pressure of the hydrogen-rich natural gas mixture in the pressure pipeline are measured through the thermometer and the pressure gauge, and the temperature in the vacuum chamber is controlled through the cold / hot fluid in the cold / hot fluid inlet and outlet pipelines.

[0020] As a specific embodiment, refer to Figure 1 As shown in the figure, the gas distribution unit outside the vacuum chamber 1 is provided with a pressure flow and adjusting valve 14, so that the pressure and flow of the component-adjustable hydrogen-rich natural gas mixture continuously output by the gas mixer 2 can be adjusted through the existing pressure and flow adjusting valve 14, thereby being capable of continuously outputting the component-controllable hydrogen-rich natural gas mixture with adjustable pressure and flow.

[0021] As a specific embodiment, the center hole 42 of the first flange 4 and the second flange 5 is sleeved with a Teflon gasket (not shown in the figure), and the inlet pipeline 3 and the outlet pipeline 12 are sealingly connected with the outer end of the center hole 42 of the flange through the Teflon gasket, so that the structural integrity of the flange and the sealing property of the pressure can be maintained when the hydrogen-rich natural gas mixture is allowed to flow and the pressure pipeline 7 is pressurized.

[0022] As a specific embodiment, the pressure pipeline 7 is a stainless steel pipeline, used as a pressure container, and the nominal inner diameter is freely selected. Specifically, the inner diameter of the pressure pipeline 7 can be 50 mm, 100 mm, or 150 mm, etc., and the pipeline can bear a gas with a pressure of 10 MPa.

[0023] As a specific embodiment, please refer to Figure 1 As shown in the figure, the outer wall of the pressure pipeline 7 is coated with a coupling agent 15, and the transducer of the outer-clamped gas ultrasonic flowmeter 10 is coupled to the outer wall of the pressure pipeline 7 through the coupling agent 15, so that the influence of noise and vibration on the measurement result can be reduced.

[0024] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A sound velocity measuring apparatus for a hydrogen-rich natural gas mixture with adjustable components, characterized by, The device comprises a vacuum chamber and a gas distribution unit, the gas distribution unit comprises a gas mixer and an online chromatographic analyzer in communication with the gas mixer, the gas outlet of the gas mixer is connected with an inlet pipeline extending into the vacuum chamber, the vacuum chamber is provided with oppositely arranged first and second flanges, a plurality of fixing holes in the periphery of the first and second flanges are connected with support rods through bolts, the outer ends of the support rods are fixedly connected with the inner wall of the vacuum chamber, the opposite inner sides of the first and second flanges are fixedly provided with a pressure pipeline, the inner wall of the pressure pipeline is provided with a thermometer, a pressure gauge and two oppositely arranged heat exchangers, the outer wall of the pressure pipeline is provided with a fixed guide rail, the transducer of an outer clamp type gas ultrasonic flowmeter for measuring the sound velocity of the gas is tightly attached to the outer wall of the pressure pipeline through the fixed guide rail, the inner end of the inlet pipeline extending into the vacuum chamber is sealingly connected with the outer end of the central hole of the first flange, the gas inlet of the pressure pipeline is sealingly connected with the inner end of the central hole of the first flange, the gas outlet of the pressure pipeline is sealingly connected with the inner end of the central hole of the second flange, the outer end of the central hole of the second flange is sealingly connected with an outlet pipeline extending out of the vacuum chamber, the cold / hot fluid inlet and outlet pipelines extending into the vacuum chamber are arranged on both sides of the outlet pipeline, the inner ends of the cold / hot fluid inlet and outlet pipelines are in communication with each other outside the first flange, and the outer ends of the cold / hot fluid inlet and outlet pipelines are connected with an existing cold / hot bath outside.

2. The composition-adjustable hydrogen-rich natural gas mixture sound velocity measurement device according to claim 1, characterized by, The gas distribution unit outside the vacuum chamber is provided with pressure and flow regulating valves.

3. The composition-adjustable hydrogen-rich natural gas mixture sound velocity measurement apparatus according to claim 1, characterized by, The central hole of the first and second flanges is provided with a Teflon gasket, and the inlet and outlet pipelines are sealingly connected with the outer end of the central hole of the flange through the Teflon gasket.

4. The composition-adjustable hydrogen-rich natural gas mixture sound velocity measurement apparatus according to claim 1, characterized by, The pressure pipeline is a stainless steel pipeline, and the inner diameter of the pressure pipeline is 50mm, 100mm or 150mm.

5. The composition-adjustable hydrogen-rich natural gas mixture sound velocity measurement apparatus according to claim 1, characterized by, The outer wall of the pressure pipeline is coated with a coupling agent, and the transducer of the outer clamp type gas ultrasonic flowmeter is coupled to the outer wall of the pressure pipeline through the coupling agent.

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