CN114113214A - Uniform high-temperature heat transfer characteristic testing device suitable for supercritical fluid - Google Patents
Uniform high-temperature heat transfer characteristic testing device suitable for supercritical fluid Download PDFInfo
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- CN114113214A CN114113214A CN202111183604.0A CN202111183604A CN114113214A CN 114113214 A CN114113214 A CN 114113214A CN 202111183604 A CN202111183604 A CN 202111183604A CN 114113214 A CN114113214 A CN 114113214A
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- G—PHYSICS
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- G01N25/48—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on solution, sorption, or a chemical reaction not involving combustion or catalytic oxidation
- G01N25/4873—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on solution, sorption, or a chemical reaction not involving combustion or catalytic oxidation for a flowing, e.g. gas sample
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Abstract
The invention discloses a device for testing uniform high-temperature heat transfer characteristics of supercritical fluid, which comprises a heat input module and a heat conduction test module, wherein the heat input module is used for inputting heat to the supercritical fluid; the heat conduction testing module is arranged on the heat input module, and high temperature is uniformly transmitted into the heat conduction testing module through the heat input module; the heat input module comprises a medium-frequency power supply, a capacitor, a water-cooled cable, an induction coil, a mica plate and a graphite plate; the medium-frequency power supply is connected with a capacitor, the capacitor is connected with the induction coil through a water-cooled cable, and the mica plate is arranged between the induction coil and the graphite plate; the heat conduction testing module is arranged on the graphite plate; the working principle of the heat input module is that a graphite plate is heated through medium-frequency induction to obtain a uniform flat plate heat source; the final test module is fixed at the position of 0.5mm on the graphite plate through the rack and is transmitted to the test module through radiation and air heat conduction, so that high-temperature stable flat plate heating is realized; the test plates can reach a maximum of 1000 ℃.
Description
Technical Field
The invention relates to the technical field of fluid heat exchange experimental equipment, in particular to a uniform high-temperature heat transfer characteristic testing device suitable for supercritical fluid.
Background
The power industry starts to optimize, adjust, transform and upgrade, and gradually builds a clean, low-carbon, safe and efficient modern energy system. The thermoelectric conversion efficiency of the supercritical fluid Brayton cycle system is far higher than that of the traditional steam turbine and the gas turbine taking gas as a medium, and the supercritical fluid Brayton cycle system has good application prospect and research value in the field of power generation.
Supercritical fluid (supercritical fluid) refers to fluid with temperature and pressure higher than its critical state, such as supercritical carbon dioxide, supercritical water, etc.; the supercritical fluid has the characteristics of large density, large heat conductivity coefficient, low viscosity and low surface tension, has better flow and heat transfer performance than the conventional fluid, is widely applied to the technical field of power engineering, and is a relatively ideal power cycle working medium.
For the Brayton cycle, the key characteristic is that a large amount of heat can be regenerated after the exhaust of the turbine, the heat is about 60% -70% of the total heat transfer, and the cycle performance depends on the regenerative efficiency to a great extent; there is therefore a need for a very clear understanding of the heat transfer characteristics of supercritical fluids at present.
However, although the change of the supercritical fluid from the low-temperature liquid phase to the high-temperature gas phase is a continuous process without phase change, the flow and heat transfer phenomena of the supercritical fluid during the temperature increase or decrease process are very complicated; therefore, the heat transfer and endothermic reaction characteristics of the supercritical fluid need to be studied systematically; particularly, the heat exchange characteristic test in a high-temperature environment (about 1000 ℃) has a great problem, and at present, the experimental devices capable of uniformly reaching the test temperature are very few and mainly take numerical simulation and theoretical analysis; this also greatly restricts the research on supercritical fluid heat transfer and the development of supercritical fluid brayton thermoelectric systems.
Disclosure of Invention
Aiming at the problems, the scheme provides a device for testing the uniform high-temperature heat transfer characteristics of the supercritical fluid; so as to realize the real-time measurement and analysis of the heat transfer and endothermic reaction characteristics of the supercritical fluid; the problem that the heat exchange characteristic of the supercritical fluid in a high-temperature environment (about 1000 ℃) can not be tested efficiently in the prior art is solved.
The scheme is realized as follows:
a testing device for uniform high-temperature heat transfer characteristics of supercritical fluid comprises a heat input module and a heat conduction testing module; the heat conduction testing module is arranged on the heat input module, and high temperature is uniformly transmitted to the heat conduction testing module through the heat input module, and the heat transmission is carried out in a heat radiation and air heat conduction mode.
Based on the structure of the device for testing the uniform high-temperature heat transfer characteristic of the supercritical fluid, the heat input module comprises a medium-frequency power supply, a capacitor, a water-cooling cable, an induction coil, a mica plate and a graphite plate; the medium-frequency power supply is connected with a capacitor, the capacitor is connected with the induction coil through a water-cooled cable, and the mica plate is arranged between the induction coil and the graphite plate; the heat conduction testing module is arranged on the graphite plate.
Based on the structure of the device for testing the uniform high-temperature heat transfer characteristic of the supercritical fluid, the heat input module heats the graphite plate through medium-frequency induction to obtain a uniform flat heat source on the graphite plate; the heat transfer mode of the graphite plate and the heat conduction testing module is radiation and air heat conduction transfer to the testing module.
Based on the structure of the device for testing the uniform high-temperature heat transfer characteristics of the supercritical fluid, the heat conduction testing module comprises a cover plate, a coil pipe, a thermocouple guide pipe and a heat flux density sensor; the coil pipes are uniformly and reciprocally arranged on the cover plate in a bending mode, and the thermocouple guide pipe is arranged between the adjacent bent coil pipes; thermocouples can be inserted into the thermocouple catheter to perform multipoint detection on the temperature change condition of the supercritical fluid medium; the heat flux density sensor is arranged on the cover plate;
based on the structure of the device for testing the uniform high-temperature heat transfer characteristics of the supercritical fluid, the two ends of the coil pipe are respectively provided with the fluid inlet assembly and the fluid outlet assembly, and the fluid inlet assembly and the fluid outlet assembly are communicated with the external supercritical fluid medium to be tested to test the heat conduction characteristics of the supercritical fluid.
Based on the structure of the device for testing the uniform high-temperature heat transfer characteristic of the supercritical fluid, the device also comprises a water cooling system, wherein the water cooling system comprises a water pump, a water valve, a filter, a water conveying pipeline and a heat exchanger; the water pump is arranged on an external water source, and the water conveying pipeline comprises a main pipeline and branch pipelines; the water valve and the filter are arranged on the main pipeline.
Based on the structure of the device for testing the uniform high-temperature heat transfer characteristics of the supercritical fluid, the branch pipelines are arranged into a plurality of pipelines which are respectively a power supply cooling pipeline, a capacitance cooling pipeline and an induction coil cooling pipeline; the water outlet ends of the power supply cooling pipeline, the capacitance cooling pipeline and the induction coil cooling pipeline are converged in the heat exchanger.
Based on the structure of the device for testing the uniform high-temperature heat transfer characteristics of the supercritical fluid, the device is also provided with a data acquisition end, the data acquisition end is respectively connected with the thermocouple and the heat flow density sensor, and the data acquisition end records the temperature measurement change of the thermocouple and the heat flow density change on the cover plate in real time.
Based on the structure of the device for testing the uniform high-temperature heat transfer characteristics of the supercritical fluid, the output voltage range of the intermediate-frequency power supply is 70-550V, the induction coil is a copper tube or a square copper tube with the diameter of more than 8 MM and the wall thickness of more than 1MM, and the total length is more than 5 meters.
Based on the structure of the device for testing the uniform high-temperature heat transfer characteristic of the supercritical fluid, the heating temperature of the heat conduction testing module can reach 1000 ℃ at most, and the temperature difference between all regions of the whole heat conduction testing module is within 2 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1. the working principle of the heat input module is that a graphite plate is heated through medium-frequency induction to obtain a uniform flat plate heat source; the final test module is fixed at the position of 0.5mm on the graphite plate through the rack and is transmitted to the test module through radiation and air heat conduction, so that high-temperature stable flat plate heating is realized; the test plate can reach a maximum of 1000 ℃, and the temperature difference among all areas of the whole test plate is within 2 ℃.
2. After the heating device is heated at a uniform and stable high temperature, the temperature measurement change of the galvanic couple and the heat flux density change on the cover plate are recorded in real time through the data acquisition end; and realizing the experimental record of the heat conduction characteristic of the supercritical fluid.
Drawings
FIG. 1 is a schematic diagram of the overall architecture of the system of the present invention;
FIG. 2 is a schematic view of the heating principle of the system of the present invention;
FIG. 3 is a schematic structural diagram of a thermal conductivity test module according to the present invention;
in the figure: 1. a medium frequency power supply; 2. a capacitor; 3. a water-cooled cable; 4. an induction coil; 5. mica plates; 6. a graphite plate; 7. a cover plate; 8. a coil pipe; 9. a thermocouple guide tube; 10. a fluid inlet assembly; 11. a fluid outlet assembly; 12. a water pump; 13. a water valve; 14. a filter; 15. a heat exchanger; 161. a main pipeline; 162. a power supply cooling pipeline; 163. a capacitor cooling circuit; 164. an induction coil cooling circuit; 17. and a heat conduction testing module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Example 1
Referring to fig. 1 to 3, the present invention provides a technical solution:
a uniform high-temperature heat transfer characteristic testing device suitable for supercritical fluid comprises a heat input module and a heat conduction testing module 17; the heat conduction testing module 17 is arranged on the heat input module, and high temperature is uniformly transmitted to the heat conduction testing module 17 through the heat input module, and heat transmission is carried out in a heat radiation and air heat conduction mode.
The heat input module comprises a medium-frequency power supply 1, a capacitor 2, a water-cooled cable 3, an induction coil 4, a mica plate 5 and a graphite plate 6; the medium-frequency power supply 1 is connected with a capacitor 2, the capacitor 2 is connected with an induction coil 4 through a water-cooled cable 3, and the mica plate 5 is arranged between the induction coil 4 and a graphite plate 6;
based on the structure, the mica plate 5 can prevent the induction coil 4 and the graphite plate 6 from being bonded under a high-temperature state, so that the high-efficiency operation of the equipment is ensured; the safety of the line is ensured by the water-cooled cable 3.
The heat conduction testing module 17 is arranged on the graphite plate 6;
based on the structure, the heat input module heats the graphite plate 6 through medium-frequency induction, and a uniform flat plate heat source is obtained on the graphite plate 6; finally, heating a heat conduction test module 17 arranged at a position of 0.5mm on the graphite plate 6, wherein the heat conduction test module 17 is fixed on the graphite plate 6 through a rack, and the heat transfer modes of the graphite plate 6 and the heat conduction test module 17 are radiation and air heat conduction transfer to the test module, so that high-temperature stable flat plate heating is realized; the high temperature in the scheme is about 1000 ℃.
The heat conduction test module 17 comprises a cover plate 7, a coil 8, a thermocouple guide tube 9 and a heat flux density sensor; the coil pipe 8 is uniformly and reciprocally bent on the cover plate 7, a fluid inlet assembly 10 and a fluid outlet assembly 11 are respectively arranged at two ends of the coil pipe 8, and the coil pipe is communicated with an external supercritical fluid medium to be tested through the fluid inlet assembly 10 and the fluid outlet assembly 11, so that the heat conduction characteristic of the supercritical fluid is tested;
the thermocouple guide tubes 9 are arranged between the adjacent bent coil tubes 8, in the embodiment, the number of the thermocouple guide tubes 9 is 8, the thermocouple guide tubes are respectively arranged along the center of the cover plate 7 in a symmetrical mode, and the number of single edges is 4; thermocouples can be inserted into the thermocouple guide tube 9 to perform multipoint detection on the temperature change condition of the supercritical fluid medium;
the heat flux density sensor is arranged on the cover plate 7, is in close contact with the cover plate 7 and detects the change of the heat flux density on the cover plate 7;
example 2
The testing device also comprises a water cooling system, wherein the water cooling system comprises a water pump 12, a water valve 13, a filter 14, a water conveying pipeline and a heat exchanger 15; the water pump 12 is arranged on an external water source, and the water conveying pipeline comprises a main pipeline 161 and branch pipelines; the water valve 13 and the filter 14 are arranged on the main pipeline 161, the water valve 13 controls the on-off condition of the whole water cooling system, and the filter 14 can filter water entering the water cooling system, so that subsequent water cooling components or pipelines are prevented from being blocked; the high-efficiency operation of the water cooling system is ensured.
The branch pipelines are arranged into a plurality of branch pipelines, namely a power supply cooling pipeline 162, a capacitance cooling pipeline 163 and an induction coil cooling pipeline 164; the water outlet ends of the power supply cooling pipeline 162, the capacitance cooling pipeline 163 and the induction coil cooling pipeline 164 converge in the heat exchanger 15, and after heat exchange, the cooling water is discharged to a water source for recycling.
Based on the structure, the power supply, the capacitor 2 and the induction coil 4 are respectively cooled through the power supply cooling pipeline 162, the capacitor cooling pipeline 163 and the induction coil cooling pipeline 164, so that the safety and controllability of the whole system are ensured.
In the embodiment, a data acquisition end is also arranged and is respectively connected with the thermocouple and the heat flux density sensor, and the data acquisition end records the temperature measurement change of the thermocouple and the heat flux density change on the cover plate 7 in real time; and realizing the experimental record of the heat conduction characteristic of the supercritical fluid.
The output voltage range of the intermediate frequency power supply 1 is 70-550V, and the intermediate frequency power supply is grounded by 6mm2 annealed copper wires;
the induction coil 4 is a copper tube or a square copper tube with the diameter of more than 8 MM and the wall thickness of more than 1MM, and the total length of the induction coil is more than 5 meters;
in the scheme, the heat input principle of the heat input module is that the graphite plate 6 is uniformly heated by medium-frequency induction current and then is transmitted to the test module through heat radiation and air heat conduction, and based on the heat input method, the test module can be uniformly heated at high temperature; the test plate can reach a maximum of 1000 ℃, and the temperature difference among all areas of the whole test plate is within 2 ℃.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A uniform high-temperature heat transfer characteristic testing device suitable for supercritical fluid is characterized in that: the device comprises a heat input module and a heat conduction test module; the heat conduction testing module is arranged on the heat input module, and high temperature is uniformly transmitted to the heat conduction testing module through the heat input module, and the heat transmission is carried out in a heat radiation and air heat conduction mode.
2. The apparatus for testing uniform high-temperature heat transfer characteristics of supercritical fluid according to claim 1, wherein: the heat input module comprises a medium-frequency power supply, a capacitor, a water-cooled cable, an induction coil, a mica plate and a graphite plate; the medium-frequency power supply is connected with a capacitor, the capacitor is connected with the induction coil through a water-cooled cable, and the mica plate is arranged between the induction coil and the graphite plate; the heat conduction testing module is arranged on the graphite plate.
3. The apparatus for testing uniform high-temperature heat transfer characteristics of supercritical fluid according to claim 2, wherein: the heat input module heats the graphite plate through medium-frequency induction to obtain a uniform flat heat source on the graphite plate; the heat transfer mode of the graphite plate and the heat conduction testing module is radiation and air heat conduction transfer to the testing module.
4. The apparatus for testing uniform high-temperature heat transfer characteristics of supercritical fluid according to claim 1 or 2, wherein: the heat conduction testing module comprises a cover plate, a coil pipe, a thermocouple guide pipe and a heat flux density sensor; the coil pipes are uniformly and reciprocally arranged on the cover plate in a bending mode, and the thermocouple guide pipe is arranged between the adjacent bent coil pipes; thermocouples can be inserted into the thermocouple catheter to perform multipoint detection on the temperature change condition of the supercritical fluid medium; the heat flux density sensor is arranged on the cover plate.
5. The apparatus for testing uniform high-temperature heat transfer characteristics of supercritical fluid according to claim 4, wherein: and the two ends of the coil pipe are respectively provided with a fluid inlet assembly and a fluid outlet assembly which are communicated with an external supercritical fluid medium to be tested through the fluid inlet assembly and the fluid outlet assembly, so that the heat conduction characteristic of the supercritical fluid is tested.
6. The apparatus for testing uniform high-temperature heat transfer characteristics of supercritical fluid according to claim 5, wherein: the water cooling system comprises a water pump, a water valve, a filter, a water conveying pipeline and a heat exchanger; the water pump is arranged on an external water source, and the water conveying pipeline comprises a main pipeline and branch pipelines; the water valve and the filter are arranged on the main pipeline.
7. The apparatus for testing uniform high-temperature heat transfer characteristics of supercritical fluid according to claim 6, wherein: the branch pipelines are arranged into a plurality of branch pipelines which are respectively a power supply cooling pipeline, a capacitance cooling pipeline and an induction coil cooling pipeline; the water outlet ends of the power supply cooling pipeline, the capacitance cooling pipeline and the induction coil cooling pipeline are converged in the heat exchanger.
8. The apparatus for testing uniform high-temperature heat transfer characteristics of supercritical fluid according to claim 7, wherein: the temperature measurement device is characterized by also comprising a data acquisition end, wherein the data acquisition end is respectively connected with the thermocouple and the heat flow density sensor, and the data acquisition end records the temperature measurement change of the thermocouple and the heat flow density change on the cover plate in real time.
9. The apparatus for testing uniform high-temperature heat transfer characteristics of supercritical fluid according to claim 8, wherein: the output voltage range of the medium-frequency power supply is 70-550V, the induction coil is a copper tube or a square copper tube with the diameter of more than 8 MM and the wall thickness of more than 1MM, and the total length is more than 5 meters.
10. The apparatus for testing uniform high-temperature heat transfer characteristics of supercritical fluid according to claim 9, wherein: the heating temperature of the heat conduction testing module can reach 1000 ℃ at most, and the temperature difference among all the areas of the whole heat conduction testing module is within 2 ℃.
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