A distributed movable in-pipeline gas component stratification measurement device

Abstract

The application provides a distributed movable pipeline internal mixed gas component layering measuring device, which comprises a heating inlet section horizontal circular pipe, a heating section horizontal circular pipe and a heating outlet section horizontal circular pipe; a mixed gas component layering measuring device is respectively arranged on the heating inlet section horizontal circular pipe and the heating outlet section horizontal circular pipe; the mixed gas component layering measuring device comprises an upper gas component measuring device and a lower gas component measuring device, the upper gas component measuring device and the lower gas component measuring device are the same in structure and are respectively symmetrically arranged above and below the horizontal circular pipe section; the movable temperature measuring module and the gas component measuring module can measure the temperature and the gas component at different radial positions on the circular pipe section, can directly indicate the influence of the gas temperature gradient on the gas component and provide technical support for the temperature and the gas component distribution characteristics of the binary mixed gas in the pipeline.

Description

Technical Field

[0001] This invention belongs to the field of engineering fluid thermal hydraulic technology, specifically relating to a distributed mobile pipeline mixed gas component stratification measurement device. Background Technology

[0002] Small modular reactor (SMR) systems offer advantages such as flexible deployment, wide applicability, and compact structure, making them promising for applications in remote and localized power supply. As a type of SMR, the ultra-high temperature gas-cooled reactor (UHTRC) in Generation IV reactors typically uses inert gases such as helium-xenon or carbon dioxide as coolants. When the power output of a SMR reaches megawatt or sub-megawatt levels, a closed Brayton cycle is preferable. To improve the performance of the closed Brayton cycle, binary mixtures of inert gases, especially helium-xenon mixtures, are often used as the working fluid. Compared to the more common helium, helium-xenon mixtures are physically stable, easily compressible, and possess excellent thermodynamic properties, making them suitable as a coolant in a closed Brayton cycle. New mixed-flue cooled reactors utilize mixed gas working fluids for core cooling, combined with direct Brayton cycle power generation. These reactors feature system simplification, lightweight and compact equipment, ease of operation, high power-to-weight ratio, and inherent safety, offering broad development prospects.

[0003] Unlike commonly used coolants like water, gaseous coolants, especially binary gas mixtures, possess unique flow heat transfer characteristics within channels. Furthermore, under the influence of flow acceleration, buoyancy, and their coupling, binary gas mixtures may exhibit thermal stratification within the channels, resulting in temperature gradients across the channel cross-section. Since binary gas mixtures consist of two single-atom gases with different molecular masses, the temperature gradient during flow within the pipe may cause deviations in gas components at different locations, thus affecting the flow heat transfer characteristics of the binary gas mixture. Measuring the temperature and gas component distribution characteristics of binary gas mixtures within pipes can support research on the flow heat transfer characteristics of mixed gases, providing a foundation for the research and development of ultra-high temperature gas-cooled reactors.

[0004] Existing gas composition measuring devices have several limitations: firstly, they cannot achieve real-time measurement of gas composition at different radial positions within a pipeline; secondly, they cannot achieve multi-point measurement of gas composition along the pipeline's axial direction; and thirdly, they cannot be combined with gas temperature measuring devices, thus failing to simultaneously measure the gas temperature difference within the pipeline and the differences in gas composition under that temperature difference. Summary of the Invention

[0005] The purpose of this invention is to provide a distributed mobile pipeline mixed gas component stratification measurement device.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A distributed mobile pipeline mixed gas component stratification measurement device includes: a horizontal circular pipe with a heating inlet section, a horizontal circular pipe with a heating section, and a horizontal circular pipe with a heating outlet section.

[0008] A mixed gas component stratification measurement device is installed on the horizontal circular pipe of the heating inlet section and the horizontal circular pipe of the heating outlet section, respectively.

[0009] The mixed gas component stratification measurement device includes an upper gas component measurement device and a lower gas component measurement device. The upper gas component measurement device and the lower gas component measurement device have the same structure and are symmetrically installed directly above and below the horizontal circular tube cross-section, respectively.

[0010] The upper gas composition measuring device includes a movable temperature measuring module and a gas composition measuring module. The gas composition measuring module is closely attached to the movable temperature measuring module. The thermocouple temperature measuring probe of the movable temperature measuring module is inserted through a hole in the circular tube and comes into direct contact with the gas. The gas temperature at the position of the thermocouple temperature measuring probe is monitored in real time by a data acquisition system. The gas composition measuring module extracts gas near the position of the thermocouple temperature measuring probe through a gas sampling and pressure-sensing tube, and transports it to a gas thermal conductivity meter through the gas sampling and pressure-sensing tube to measure the composition of the gas at that position.

[0011] Furthermore, the movable temperature measurement module includes a movable thermocouple holder, and a thermocouple data transmission line is fixedly installed inside the movable thermocouple holder by a thermocouple sealing sleeve. One end of the thermocouple data transmission line is connected to the thermocouple temperature measurement probe, and the other end is connected to the data acquisition system.

[0012] The gas component measurement module includes a movable pressure tap, which is connected to the gas transport pressure tap via a valve;

[0013] The movable thermocouple holder and the movable pressure tap are respectively mounted on the base with shaft seals and can move up and down. The base is welded to a horizontal circular tube.

[0014] The movable thermocouple holder and the movable pressure tube are connected and cooperate with each other, maintaining the same moving distance and the same insertion depth in the moving direction.

[0015] Furthermore, the horizontal circular pipe of the heating inlet section is connected to the horizontal circular pipe of the heating section through the heating section inlet connecting flange assembly, and the horizontal circular pipe of the heating section is connected to the horizontal circular pipe of the heating outlet section through the heating section outlet connecting flange assembly.

[0016] Furthermore, the horizontal circular tube of the heating section is heated by direct current using an electric heating cabinet and copper braids.

[0017] Furthermore, a set of mixed gas component stratification measuring devices is installed on the horizontal circular pipe of the heating inlet section; N sets of mixed gas component stratification measuring devices are installed on the horizontal circular pipe of the heating outlet section, wherein N≥2.

[0018] Furthermore, the distance C1 between the two sets of mixed gas component stratification measuring devices installed on the horizontal circular pipe of the heating outlet section is 60mm~200mm.

[0019] Furthermore, the movable thermocouple holder and the movable pressure tap are inserted into the horizontal circular tube to measure the temperature and gas composition at different radial positions of the horizontal circular tube cross-section. The specified depth D1 of the movable thermocouple holder inserted into the horizontal circular tube and the specified depth D2 of the movable pressure tap inserted into the horizontal circular tube are 0~20mm respectively.

[0020] Furthermore, the inner diameter B1 of the horizontal circular tube in the heating inlet section, the inner diameter B2 of the horizontal circular tube in the heating section, and the inner diameter B3 of the horizontal circular tube in the heating outlet section are all equal, and are all 20~40mm.

[0021] The length A1 of the horizontal circular tube in the heating section is 400~1500mm.

[0022] Furthermore, the diameter of the thermocouple temperature measuring probe is 0.5~2mm; the outer diameter of the movable pressure tube is 6~10mm and the wall thickness is 1mm.

[0023] Furthermore, the upper limit of the measurable gas pressure inside the horizontal circular pipe of the heating inlet section, the horizontal circular pipe of the heating section, and the horizontal circular pipe of the heating outlet section is not less than 0.5 MPa.

[0024] The beneficial effects of this invention are as follows:

[0025] This invention integrates a temperature measurement module and a gas composition measurement module, enabling simultaneous and real-time measurement of temperature and gas composition at a specified location within a circular pipe. Through a distributed arrangement, gas composition can be measured at different locations along the pipe's axial direction. Furthermore, the movable structure design of the temperature and gas composition measurement modules allows for measurement of temperature and gas composition at different radial positions on the pipe's cross-section. This measuring device directly demonstrates the impact of gas temperature gradients on gas composition, providing technical support for the study of temperature and gas composition distribution characteristics of binary gas mixtures within pipelines.

[0026] This invention enables the measurement of the gas component distribution of various binary mixed gases within a circular tube when there is a temperature difference between the upper and lower gas layers, effectively ensuring the diversity of the measurement medium. Attached Figure Description

[0027] AppendixFigure 1 This is a perspective view of the main view of the present invention.

[0028] Appendix Figure 2 It is attached Figure 1 A partial enlarged view of the gas temperature and composition measuring device group in the upper part of the pipeline in the middle and outlet sections;

[0029] Appendix Figure 3 This is a schematic diagram showing the movement result of the temperature measurement module and the gas component measurement module described in a specific embodiment of the present invention.

[0030] In the attached diagram: 1. Horizontal circular pipe for heating inlet section; 2. Gas temperature and composition measuring device assembly in the upper part of the inlet section pipe; 3. Gas temperature and composition measuring device assembly in the lower part of the inlet section pipe; 4. Horizontal circular pipe for heating outlet section; 5. Gas intake and pressure tapping pipe; 6. Inlet connecting flange assembly for heating section; 7. Horizontal circular pipe for heating section; 8. Copper braid; 9. Outlet connecting flange assembly for heating section; 10. Gas temperature and composition measuring device assembly in the upper part of the outlet section pipe; 11. Gas temperature and composition measuring device assembly in the lower part of the outlet section pipe.

[0031] 10-1. Thermocouple data transmission line; 10-2. Thermocouple sealing sleeve; 10-3. Movable thermocouple holder; 10-4. Shaft seal; 10-5. Base; 10-6. Gas transport pressure tap; 10-7. Valve; 10-8. Movable pressure tap. Detailed Implementation

[0032] The present invention will now be further described with reference to the accompanying drawings.

[0033] This invention provides a distributed mobile pipeline mixed gas component stratification measurement device, as shown in the attached figure. Figure 1-3 As shown, it includes: a horizontal circular pipe 1 for the heating inlet section, a horizontal circular pipe 7 for the heating section, and a horizontal circular pipe 4 for the heating outlet section;

[0034] A mixed gas component stratification measurement device is installed on the horizontal circular pipe 1 of the heating inlet section and the horizontal circular pipe 4 of the heating outlet section, respectively.

[0035] The mixed gas component stratification measurement device includes an upper gas component measurement device and a lower gas component measurement device. The upper gas component measurement device and the lower gas component measurement device form a set of devices to cooperate in measurement. The upper gas component measurement device and the lower gas component measurement device have the same structure and are symmetrically installed directly above and directly below the horizontal circular tube cross section, respectively.

[0036] The upper gas composition measuring device includes an upper gas temperature and composition measuring device group 2 in the inlet section pipeline and an upper gas temperature and composition measuring device group 10 in the outlet section pipeline;

[0037] The lower gas component measuring device includes a lower gas temperature and component measuring device group 3 in the inlet section pipeline and a lower gas temperature and component measuring device group 11 in the outlet section pipeline.

[0038] In this embodiment, the mixed gas component stratification measurement device requires two sets to form a set of devices for measurement, including an upper gas component measurement device and a lower gas component measurement device, with the two sets of devices respectively arranged directly above the circular tube cross-section and directly below the same circular tube cross-section.

[0039] In this embodiment, the horizontal circular pipe 1 of the heating inlet section is connected to the horizontal circular pipe 7 of the heating section through the heating section inlet connecting flange group 6, and the horizontal circular pipe 7 of the heating section is connected to the horizontal circular pipe 4 of the heating outlet section through the heating section outlet connecting flange group 9.

[0040] Preferably, a set of mixed gas component stratification measuring devices is installed on the horizontal circular pipe 1 of the heating inlet section; N sets of mixed gas component stratification measuring devices are installed on the horizontal circular pipe 4 of the heating outlet section, wherein N≥2.

[0041] In this embodiment, a heating inlet horizontal circular pipe 1 is set before the heating section horizontal circular pipe 7, on which a set of mixed gas component stratification measuring devices are arranged, which can measure the gas component distribution when there is no temperature difference between the upper and lower gases in the circular pipe when it is not heated. A heating outlet horizontal circular pipe 4 is set after the heating section horizontal circular pipe 7, on which multiple sets of mixed gas component stratification measuring devices can be arranged along the axial direction of the circular pipe, which can measure the gas component distribution when there are different temperature differences between the upper and lower gases in the circular pipe.

[0042] In this embodiment, the horizontal circular tube 7 of the heating section is heated by direct current through an electric heating cabinet and a copper braid 8.

[0043] As attached Figure 2 As shown, the upper gas component measuring device includes a movable temperature measuring module and a gas component measuring module. The gas component measuring module is closely attached to the movable temperature measuring module. The thermocouple temperature measuring probe of the movable temperature measuring module is inserted through a hole in the circular tube and comes into direct contact with the gas. The gas temperature at the position of the thermocouple temperature measuring probe is monitored in real time by a data acquisition system. The gas component measuring module extracts gas near the position of the thermocouple temperature measuring probe through a gas sampling and pressure-sensing tube 5, and transports it to a gas thermal conductivity meter through the gas sampling and pressure-sensing tube 5 to measure the composition of the gas at that position.

[0044] As attached Figure 2As shown, the movable temperature measurement module includes a movable thermocouple holder 10-3. A thermocouple data transmission line 10-1 is fixedly installed inside the movable thermocouple holder 10-3 through a thermocouple sealing sleeve 10-2. One end of the thermocouple data transmission line 10-1 is connected to the thermocouple temperature measurement probe, and the other end is connected to the data acquisition system.

[0045] The gas component measurement module includes a movable pressure tapping tube 10-8, which is connected to the gas transport pressure tapping tube 10-6 via a valve 10-7.

[0046] In this embodiment, the movable thermocouple holder 10-3 and the movable pressure tap 10-8 are respectively sealed and mounted on the base 10-5 via shaft seals 10-4 and can move up and down. The base 10-5 is welded to a horizontal circular tube. The movable thermocouple holder 10-3 and the movable pressure tap 10-8 are interconnected and cooperate with each other, maintaining the same moving distance and the same insertion depth in the moving direction. The movable temperature measurement module and the gas component measurement module adopt an integrated design, fixed by a stainless steel base welded to the horizontal circular tube, and share a single base. This ensures the sealing between the base and the moving components, and the movable temperature measurement module and the gas component measurement model can move synchronously in the radial direction of the circular tube, achieving unified positioning of gas temperature measurement and component measurement.

[0047] As attached Figure 1 As shown, the inner diameters B1 of the horizontal circular pipe 1 (heating inlet section), B2 of the horizontal circular pipe 7 (heating section), and B3 of the horizontal circular pipe 4 (heating outlet section) are all equal, ranging from 20 to 40 mm; the length A1 of the horizontal circular pipe 7 (heating section) is 400 to 1500 mm. Installing circular pipes of different lengths allows for a wider range of heating section outlet temperatures within a certain heating power range, enabling the measurement of gas component distribution under large-scale gas temperature differences within the circular pipe. The identical inner diameters of the three circular pipes ensure a smooth transition of the gas flow cross-section between adjacent pipe sections, effectively preventing the gas flow from being affected by the connection between adjacent pipe sections.

[0048] As attached Figure 2As shown, the distance C1 between the two sets of gas mixture component stratification measurement devices installed on the horizontal circular pipe of the heating outlet section is 60mm~200mm. This ensures sufficient but not excessive gas enters the gas thermal conductivity meter, guaranteeing the accuracy of gas component measurement and minimizing impact on the gas flow state within the circular pipe. It also reduces the influence of one set of gas mixture component stratification measurement devices on the next set along the axial direction of the circular pipe, effectively ensuring measurement accuracy. Furthermore, it effectively ensures the real-time performance of thermocouple temperature measurement and prevents the thermocouple probe from bending due to gas erosion when there is a high gas flow velocity within the circular pipe, effectively guaranteeing the accuracy of the temperature measurement position.

[0049] As attached Figure 3 As shown, the movable thermocouple holder 10-3 is inserted into the horizontal circular pipe to measure the temperature and gas composition at different radial positions within the cross-section of the horizontal circular pipe. The specified insertion depths D1 and D2 of the movable thermocouple holder 10-3 into the horizontal circular pipe are 0~20mm respectively. For any set of gas composition measuring devices installed in the inlet section before heating and the outlet section after heating, the movable thermocouple holder and pressure tap can be moved up and down across the pipe cross-section to measure the gas temperature and gas composition at different radial positions, thus achieving the measurement of the gas composition distribution at different radial positions within the same cross-section of the circular pipe.

[0050] In this embodiment, the diameter of the thermocouple temperature measuring probe is 0.5~2mm; the outer diameter of the movable pressure tube 10-8 is 6~10mm and the wall thickness is 1mm. This effectively ensures the real-time performance of the thermocouple temperature measurement, and also prevents the thermocouple probe from bending due to gas erosion when there is a large gas flow velocity inside the circular tube, effectively ensuring the accuracy of the temperature measurement position; it also ensures that sufficient but not excessive gas enters the gas thermal conductivity meter, ensuring the accuracy of gas component measurement and not excessively affecting the gas flow state inside the circular tube.

[0051] In this embodiment, the upper limit of the measurable gas pressure inside the horizontal circular pipe 1 (heating inlet section), the horizontal circular pipe 7 (heating section), and the horizontal circular pipe 4 (heating outlet section) is not less than 0.5 MPa. This enables the measurement of gas component distribution under higher pressures and effectively achieves the measurement of gas component distribution under various gas pressure parameters.

[0052] The binary mixed gases that can be measured by this invention include, but are not limited to, gases composed of inert gases such as helium-argon, helium-krypton, and helium-xenon, as well as mixed gases such as hydrogen and nitrogen mixed with water vapor.

[0053] Working principle of the invention:

[0054] The gas flowing inside the pipe is heated by electric heating. The electric heating cabinet, copper braid, and horizontal circular heating pipe 7 form a closed loop. The electric heating cabinet is the power source, and the horizontal circular heating pipe 7 is the load. The electric heating cabinet supplies current and voltage to the horizontal circular heating pipe 7 through the copper braid. The horizontal circular heating pipe 7 is made of stainless steel and can be considered a purely resistive circuit after applying current and voltage at both ends. The temperature of the horizontal circular heating pipe 7 rises, heating the gas flowing inside. After the gas flows inside the pipe and is heated by the pipe wall, due to the influence of buoyancy, thermal stratification occurs during the flow process, where the gas temperature at the upper part of the pipe cross-section is higher than that at the lower part. This temperature difference between the upper and lower gas sections may cause the migration of gas atoms, resulting in a deviation in the gas composition.

[0055] A gas thermal conductivity meter is used to measure the gas composition. By measuring and calculating the thermal conductivity of the gas entering the meter, and comparing it with a single-component standard gas, the volume fraction of a certain gas in the gas mixture is obtained. For a binary gas mixture, the measurement result is the volume percentage of that gas in the binary gas mixture.

[0056] The portable temperature measurement module measures the gas temperature at the location of the temperature probe in real time, and transmits the data to the acquisition system via thermocouple data transmission line 10-1 for real-time temperature display. The valve in the gas component measurement module, located adjacent to the temperature measurement module, opens, allowing the binary gas mixture in the pipeline, operating at a pressure higher than atmospheric pressure, to flow through the pressure tap to the gas thermal conductivity meter under the influence of the pressure difference. The volume fraction of one component gas in the binary mixture is measured in real time. The result represents the gas composition at a specific temperature at that location within the pipeline.

[0057] The mixed gas component stratification measuring device designed in this invention can simultaneously measure the temperature and gas composition of the mixed gas at a certain location in a pipeline. With the use of the measuring device, it is possible to measure the gas temperature and gas composition at different locations along the radial direction of any cross section of the pipeline, so as to characterize the gas thermal stratification phenomenon of that cross section and the possible gas component stratification phenomenon.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A distributed mobile pipeline mixed gas component stratification measurement device, characterized in that, include: Heating inlet section horizontal circular pipe (1), heating section horizontal circular pipe (7), heating outlet section horizontal circular pipe (4); The horizontal circular pipe (1) of the heating inlet section and the horizontal circular pipe (4) of the heating outlet section are respectively equipped with a mixed gas component stratification measuring device; The mixed gas component stratification measurement device includes an upper gas component measurement device and a lower gas component measurement device. The upper gas component measurement device and the lower gas component measurement device have the same structure and are symmetrically installed directly above and below the horizontal circular tube cross-section, respectively. The upper gas component measuring device includes a movable temperature measuring module and a gas component measuring module. The gas component measuring module is closely attached to the movable temperature measuring module. The thermocouple temperature measuring probe of the movable temperature measuring module is inserted through a hole on the circular tube and comes into direct contact with the gas. The gas temperature at the position of the thermocouple temperature measuring probe is monitored in real time by a data acquisition system. The gas component measuring module penetrates the circular tube through a gas sampling and pressure-sensing tube (5) to extract the gas near the position of the thermocouple temperature measuring probe. The gas is then transported to a gas thermal conductivity meter through the gas sampling and pressure-sensing tube (5) to measure the composition of the gas at that position. The movable temperature measurement module includes a movable thermocouple holder (10-3). A thermocouple data transmission line (10-1) is fixedly installed inside the movable thermocouple holder (10-3) through a thermocouple sealing sleeve (10-2). One end of the thermocouple data transmission line (10-1) is connected to the thermocouple temperature measurement probe, and the other end is connected to the data acquisition system. The gas component measurement module includes a movable pressure tap (10-8), which is connected to the gas transport pressure tap (10-6) via a valve (10-7). The movable thermocouple holder (10-3) and the movable pressure tap (10-8) are respectively sealed and mounted on the base (10-5) by a shaft seal (10-4) and can move up and down. The base (10-5) is welded to a horizontal circular tube. The movable thermocouple holder (10-3) and the movable pressure tube (10-8) are connected and cooperate with each other, maintaining the same moving distance and the same insertion depth in the moving direction.

2. The distributed mobile pipeline mixed gas component stratification measurement device according to claim 1, characterized in that, The horizontal circular pipe (1) of the heating inlet section is connected to the horizontal circular pipe (7) of the heating section through the heating section inlet connecting flange group (6), and the horizontal circular pipe (7) of the heating section is connected to the horizontal circular pipe (4) of the heating outlet section through the heating section outlet connecting flange group (9).

3. The distributed mobile pipeline mixed gas component stratification measurement device according to claim 2, characterized in that, The horizontal circular tube (7) of the heating section is heated by direct current through an electric heating cabinet and a copper braid (8).

4. The distributed mobile pipeline mixed gas component stratification measurement device according to claim 3, characterized in that, A set of mixed gas component stratification measuring devices is installed on the horizontal circular pipe (1) of the heating inlet section; N sets of mixed gas component stratification measuring devices are installed on the horizontal circular pipe (4) of the heating outlet section, wherein N≥2.

5. The distributed mobile pipeline mixed gas component stratification measurement device according to claim 4, characterized in that, The distance C1 between the two sets of mixed gas component stratification measuring devices installed on the horizontal circular pipe of the heating outlet section is 60mm~200mm.

6. The distributed mobile pipeline mixed gas component stratification measurement device according to claim 1, characterized in that, The movable thermocouple holder (10-3) and the movable pressure tap (10-8) are inserted into the horizontal circular tube to measure the temperature and gas composition at different radial positions of the horizontal circular tube cross-section. The specified depth D1 of the movable thermocouple holder (10-3) inserted into the horizontal circular tube and the specified depth D2 of the movable pressure tap (10-8) inserted into the horizontal circular tube are 0~20mm respectively.

7. The distributed mobile pipeline mixed gas component stratification measurement device according to claim 1, characterized in that, The inner diameter B1 of the horizontal circular tube (1) of the heating inlet section, the inner diameter B2 of the horizontal circular tube (7) of the heating section, and the inner diameter B3 of the horizontal circular tube (4) of the heating outlet section are all equal, and are all 20~40mm. The length A1 of the horizontal circular tube (7) of the heating section is 400~1500mm.

8. The distributed mobile pipeline mixed gas component stratification measurement device according to claim 1, characterized in that, The diameter of the thermocouple temperature measuring probe is 0.5~2mm; the outer diameter of the movable pressure tube (10-8) is 6~10mm and the wall thickness is 1mm.

9. The distributed mobile pipeline mixed gas component stratification measurement device according to claim 1, characterized in that, The upper limit of the measurable gas pressure inside the horizontal circular pipe (1) of the heating inlet section, the horizontal circular pipe (7) of the heating section, and the horizontal circular pipe (4) of the heating outlet section shall not be less than 0.5 MPa.

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