CN108344768B - Device and method for measuring heat conductivity coefficient of gas-liquid component - Google Patents
Device and method for measuring heat conductivity coefficient of gas-liquid component Download PDFInfo
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- CN108344768B CN108344768B CN201810233414.7A CN201810233414A CN108344768B CN 108344768 B CN108344768 B CN 108344768B CN 201810233414 A CN201810233414 A CN 201810233414A CN 108344768 B CN108344768 B CN 108344768B
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- 239000007788 liquid Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 97
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 77
- 239000012071 phase Substances 0.000 claims abstract description 41
- 239000007791 liquid phase Substances 0.000 claims abstract description 40
- 238000010438 heat treatment Methods 0.000 claims abstract description 39
- 239000011521 glass Substances 0.000 claims description 20
- 238000005259 measurement Methods 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 6
- 238000005286 illumination Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 3
- 239000000243 solution Substances 0.000 description 46
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 4
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—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
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- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention discloses a device and a method for measuring the heat conductivity coefficients of gas-liquid components, which can simultaneously measure the heat conductivity coefficients of gas and liquid under the working conditions of controllable temperature and pressure (or concentration). The measuring device comprises a testing body, a gas phase heat conductivity coefficient tester, a condensing coil, a liquid phase heat conductivity coefficient tester, a first stop valve, a data acquisition instrument, a water tank, a solution pump, a second stop valve, a heat exchanger, a liquid phase temperature sensor, a temperature controller, a heating coil, a gas phase temperature sensor, a constant pressure valve and a pressure sensor; the condensing coil is fixedly connected in the inner cavity of the test body, and the water outlet end of the condensing coil is connected with the first water inlet end of the water tank through a first pipeline; the water outlet end of the water tank is connected with the water inlet end of the heat exchanger through a second pipeline; the water outlet end of the heat exchanger is connected with the water inlet end of the condensing coil; the heating coil is fixedly connected in the inner cavity of the test body, and the temperature controller is connected with the heating coil.
Description
Technical Field
The invention belongs to the field of gas-liquid component performance measurement, and particularly relates to a device and a method for measuring the heat conductivity coefficient of a gas-liquid component.
Technical Field
Thermal conductivity is one of the most fundamental thermophysical properties of a substance. Has wide application in the industries of energy, chemical industry, refrigeration and the like. The thermal fluid is often in a gas-liquid coexisting state particularly in thermal devices such as evaporators, condensers, generators, rectifiers and the like. At this point, the temperature, pressure, volume (or temperature, pressure, concentration) in the heat exchange device is in a steady state or an unsteady state. How to accurately measure the heat conductivity coefficient of the gas-liquid two-phase medium in a transient state or a steady state is a precondition for heat transfer calculation and becomes one of key factors for ensuring reasonable design of heat exchange equipment.
At present, the heat conductivity coefficient tester in the market can only generally meet the test conditions under the normal temperature working condition. Particularly, when the liquid to be tested is a volatile liquid or a mixed solution (such as an ammonia solution, lithium bromide, lithium chloride aqueous solution or nanofluid, etc.), the pressure and the concentration change with the change of temperature, and the change of temperature and concentration can change the heat conductivity coefficient. The existing thermal conductivity testing instrument cannot simultaneously meet the thermal conductivity measurement under the steady-state working condition of temperature, pressure or concentration requirements.
Disclosure of Invention
Technical problems: the invention solves the technical problem of providing a device and a method for measuring the heat conductivity coefficient of a gas-liquid component aiming at the defects of the prior art, and can simultaneously measure the heat conductivity coefficients of two states of gas and liquid under the working conditions of controllable temperature and pressure (or concentration).
The technical content is as follows: in order to solve the technical problems, the technical scheme adopted by the embodiment of the invention is as follows:
On one hand, the embodiment of the invention provides a device for measuring the heat conductivity coefficient of a gas-liquid component, which comprises a test body, a gas-phase heat conductivity coefficient tester, a condensing coil, a liquid-phase heat conductivity coefficient tester, a first stop valve, a data acquisition instrument, a water tank, a solution pump, a second stop valve, a heat exchanger, a liquid-phase temperature sensor, a temperature controller, a heating coil, a gas-phase temperature sensor, a constant pressure valve and a pressure sensor; the gas phase heat conductivity coefficient tester and the liquid phase heat conductivity coefficient tester are respectively arranged on the test body; when the device is used, the gas-phase heat conductivity coefficient tester is positioned above the liquid level in the test body, and the liquid-phase heat conductivity coefficient tester is positioned below the liquid level in the test body; the condensing coil is fixedly connected in the inner cavity of the test body, the water outlet end of the condensing coil is connected with the first water inlet end of the water tank through a first pipeline, and the first stop valve is connected in the first pipeline; the water outlet end of the water tank is connected with the water inlet end of the heat exchanger through a second pipeline, and the solution pump and the second stop valve are respectively connected in the second pipeline; the water outlet end of the heat exchanger is connected with the water inlet end of the condensing coil; the heating coil is fixedly connected in the inner cavity of the test body, and the temperature controller is connected with the heating coil; the liquid phase temperature sensor and the gas phase temperature sensor are respectively and fixedly connected to the test body; the constant pressure valve is communicated with the test body through a third pipeline; the pressure sensor is fixedly connected to the top of the test body; the data output ends of the pressure sensor, the liquid phase temperature sensor, the gas phase temperature sensor, the constant pressure valve, the gas phase heat conductivity coefficient tester and the liquid phase heat conductivity coefficient tester are respectively connected with the data input end of the data acquisition instrument.
As a preferred example, the device for measuring the heat conductivity coefficient of the gas-liquid component further comprises a sight glass, wherein the sight glass is fixedly connected with the test body.
Preferably, the number of the sight glass is at least three, wherein the first sight glass is opposite to the condensing coil, and the second sight glass is opposite to the liquid level in the test body; the third sight glass is positioned on top of the test body.
As a preferred example, the device for measuring the heat conductivity coefficient of the gas-liquid component further comprises an illuminating lamp, wherein the light-emitting surface of the illuminating lamp is opposite to the third sight glass.
As a preferred example, the device for measuring the heat conductivity coefficient of the gas-liquid component further comprises a fourth pipeline and a bypass valve, wherein one end of the fourth pipeline is connected with the second pipeline, the other end of the fourth pipeline is connected with the second water inlet end of the water tank, and the bypass valve is connected in the fourth pipeline.
As a preferable example, the test body, the water tank, the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are all provided with an outer wall heat insulation layer.
As a preferred example, the device for measuring the heat conductivity coefficient of the gas-liquid component further comprises a safety valve, wherein the safety valve is fixedly connected to the top of the testing body and is communicated with the testing body.
On the other hand, the embodiment of the invention also provides a method for measuring the heat conductivity coefficient of the gas-liquid component, which comprises the following steps:
The first step: the measuring device keeps a sealing state, and vacuumizes the test body 1;
and a second step of: filling a solution to be tested into the test body, wherein the liquid level of the solution to be tested submerges the heating coil;
And a third step of: opening a cooling water loop in the heat exchanger; opening a first stop valve, a bypass valve and a second stop valve, and enabling condensed water to circularly flow in the condensing coil, the water tank and the heat exchanger; starting a temperature controller to heat the heating coil;
Fourth step: adjusting the power of the temperature controller and the flow rate of condensate water to make the temperature and the pressure of the solution to be measured reach an equilibrium state; acquiring a gas phase and liquid phase heat conductivity coefficient test value of the solution to be tested through a data acquisition instrument;
fifth step: and returning to the fourth step, changing the power of the temperature controller and the flow rate of condensate water to obtain the gas phase and liquid phase heat conductivity coefficient test values of the solution to be measured at different temperatures and pressures until the measurement is finished.
The beneficial effects are that: compared with the prior art, the embodiment of the invention has the following beneficial effects: the testing device and the testing method can realize the measurement of the gaseous and liquid heat conductivity coefficients of the monobasic solution, the dibasic solution, the polybasic solution and the mixed solution (such as nano fluid and the like) under the steady-state working conditions of required designated temperature, pressure and concentration. Meanwhile, the measuring device of the embodiment solves the test requirement of the heat conductivity coefficient of the volatile liquid in a wider temperature and pressure range. In the prior art, the temperature regulation range is limited and the pressure cannot be constant for an open type measuring device. The measuring device of this embodiment is of a closed type structure. The device has two links of heating and condensing, and can realize the adjustment of temperature and pressure in a larger temperature area and a wider pressure range.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
The drawings are as follows: the test body 1, the gas phase heat conductivity tester 2, the condensing coil 3, the liquid phase heat conductivity tester 4, the first stop valve 5, the data acquisition instrument 6, the water tank 7, the solution pump 8, the bypass valve 9, the second stop valve 10, the heat exchanger 11, the liquid phase temperature sensor 12, the temperature controller 13, the heating coil 14, the sight glass 15, the gas phase temperature sensor 16, the constant pressure valve 17, the safety valve 18, the illuminating lamp 19 and the pressure sensor 20.
Detailed Description
The following describes in detail the examples of the present invention, which are implemented on the premise of the technical solution of the present invention, and give detailed embodiments and specific operation procedures, but the scope of the present invention is not limited to the following examples.
As shown in fig. 1, a device for testing the heat conductivity coefficient of a gas-liquid component according to an embodiment of the present invention includes a testing body 1, a gas phase heat conductivity coefficient tester 2, a condensing coil 3, a liquid phase heat conductivity coefficient tester 4, a first stop valve 5, a data acquisition instrument 6, a water tank 7, a solution pump 8, a second stop valve 10, a heat exchanger 11, a liquid phase temperature sensor 12, a temperature controller 13, a heating coil 14, a gas phase temperature sensor 16, a constant pressure valve 17 and a pressure sensor 20. The gas phase heat conductivity tester 2 and the liquid phase heat conductivity tester 4 are respectively arranged on the test body 1; when in use, the gas phase heat conductivity tester 2 is positioned above the liquid level in the test body 1, and the liquid phase heat conductivity tester 4 is positioned below the liquid level in the test body 1. The condensing coil 3 is fixedly connected in the inner cavity of the test body 1, the water outlet end of the condensing coil 3 is connected with the first water inlet end of the water tank 7 through a first pipeline, and the first stop valve 5 is connected in the first pipeline. The water outlet end of the water tank 7 is connected with the water inlet end of the heat exchanger 11 through a second pipeline, and the solution pump 8 and the second stop valve 10 are respectively connected in the second pipeline. The water outlet end of the heat exchanger 11 is connected with the water inlet end of the condensing coil 3. The heating coil 14 is fixedly connected in the inner cavity of the test body 1, and the temperature controller 13 is connected with the heating coil 14. The liquid phase temperature sensor 12 and the gas phase temperature sensor 16 are fixedly connected to the test body 1, respectively. The constant pressure valve 17 is communicated with the test body 1 through a third pipeline; the pressure sensor 20 is fixedly connected to the top of the test body 1. The data output ends of the pressure sensor 20, the liquid phase temperature sensor 12, the gas phase temperature sensor 16, the constant pressure valve 17, the gas phase heat conductivity tester 2 and the liquid phase heat conductivity tester 4 are respectively connected with the data input end of the data acquisition instrument 6.
In the device for testing the thermal conductivity of the gas-liquid component in the above embodiment, the test body 1 is filled with the solution to be tested. The solution to be measured may be a unitary solution (such as water, ethanol, refrigerant, oil, etc.), a binary solution (such as aqueous ammonia, aqueous lithium bromide, aqueous lithium chloride, binary mixed refrigerant, etc.), a multi-component solution (such as multi-component mixed refrigerant or solution, etc.), a mixed solution (such as solution with nano-or micro-particulate added), etc. The solution to be measured may be an azeotropic solution or a non-azeotropic solution.
Part of the solution to be tested volatilizes in the test body 1 to form a gas state and is still positioned in the test body 1. The gas phase thermal conductivity tester 2 is used for measuring the thermal conductivity of gas. The liquid phase thermal conductivity tester 4 is used for measuring the thermal conductivity of the liquid.
The condensing coil 3, the water tank 7 and the heat exchanger 11 form a condensing device. The condensing device adjusts the temperature of the gas in the test body 1. Specifically, for a monobasic solution, when the temperature is constant, the pressure is balanced, and when the temperature is adjusted, the pressure is also adjusted; when the solution is binary or multi-element, the temperature, pressure and concentration are unified, namely, when two parameters of the three parameters are determined to reach a steady state, the third parameter is also determined.
The thermostat 13 and the heating coil 14 constitute a heating device. The heating means heats the solution in the test body 1. The heating device heats the solution, so that the temperature of the solution is changed, and the concentration of the solution is also changed.
The flow rate of the condensed water in the condensing device is regulated by the first shut-off valve 5 and the second shut-off valve 10. The constant pressure valve 17 is used to regulate the gas pressure in the test body 1 so that the pressure in the test body 1 can be constant at the pressure required for the test.
According to the embodiment, the flow rate of the condensate water in the condensing device and the heating power of the heating device are adjusted, so that the gas-liquid components in the test body 1 are under different temperature and pressure working conditions, and the measurement of the heat conductivity coefficients of the gas-liquid states is realized. The device of the embodiment can measure the heat conductivity coefficients of gas and liquid under the working conditions of temperature and pressure in a larger section. The device adopts a closed space, has two links of heating and condensing, and can achieve the adjustment of temperature and pressure in a larger temperature area and a wider pressure range.
The data acquisition instrument 6 acquires data in the pressure sensor 20, the liquid phase temperature sensor 12 and the gas phase temperature sensor 16, and when the pressure and the temperature in the test body 1 reach the working conditions required by measurement, the data acquisition instrument 6 acquires data in the gas phase heat conductivity tester 2 and the liquid phase heat conductivity tester 4, and acquires the gas phase heat conductivity and the liquid phase heat conductivity.
After the data acquisition instrument 6 acquires the data in the pressure sensor 20, the liquid phase temperature sensor 12 and the gas phase temperature sensor 16, when the pressure and the temperature in the test body 1 cannot reach the working conditions required by measurement, the pressure and the temperature in the test body 1 can meet the working conditions required by measurement by adjusting the heating quantity of the heating coil 14 (i.e. adjusting the temperature controller 13), the water flow of the condensed water loop (i.e. adjusting the opening of the bypass valve 9) and the opening of the constant pressure valve 17. And then the data in the gas phase heat conductivity coefficient tester 2 and the liquid phase heat conductivity coefficient tester 4 are acquired through the data acquisition instrument 6, so that the gas phase heat conductivity coefficient and the liquid phase heat conductivity coefficient are acquired.
As a preferred example, the device for testing the heat conductivity coefficient of the gas-liquid component further comprises a sight glass 15, wherein the sight glass 15 is fixedly connected with the testing body 1. More preferably, the number of said mirrors 15 is at least three, wherein the first mirror 15 is opposite the condensing coil 3 and the second mirror 15 is opposite the liquid level in the test body 1; a third sight glass 15 is located at the top of the test body 1. Illumination can be provided in the test body 1 by means of a third mirror. The condensation of the gas outside the condensing coil 3 is observed by means of a first sight glass 15. The heating evaporation of the liquid outside the heating coil 14 can be observed by means of a second sight glass 15.
As a preferred example, the device for testing the thermal conductivity of the gas-liquid component further comprises an illuminating lamp 19, wherein the light emitting surface of the illuminating lamp 19 is opposite to the third sight glass 15. The light emitting surface of the illuminating lamp 19 is opposite to the third sight glass 15, so that the light emitted by the illuminating lamp 19 can irradiate the solution in the test body 1, and the measuring personnel can observe the solution more clearly through the first sight glass 15 and the second sight glass 15.
As a preferred example, the device for testing the heat conductivity coefficient of the gas-liquid component further comprises a fourth pipeline and a bypass valve 9, wherein one end of the fourth pipeline is connected with the second pipeline, the other end of the fourth pipeline is connected with the second water inlet end of the water tank 7, and the bypass valve 9 is connected in the fourth pipeline.
The condensing coil 3, the first stop valve 5, the second stop valve 10, the water tank 7, the solution pump 8, the heat exchanger 11 and the bypass valve 9 form a condensed water loop. The condensation heat is released to the atmosphere in the heat exchanger 11 by the cooling water in the cooling water circuit to the cooling tower to dissipate heat.
As a preferable example, the test body 1, the water tank 7, the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are all provided with an outer wall heat insulation layer. The purpose of setting up the heat preservation is for whole measuring device heat preservation to thermal loss is prevented, is convenient for maintain the invariable of required test operating mode (temperature, pressure), thereby makes the measurement coefficient of heat conductivity more accurate.
As a preferred example, the device for testing the thermal conductivity of the gas-liquid component further comprises a safety valve 18, wherein the safety valve 18 is fixedly connected to the top of the testing body 1 and is communicated with the testing body 1. The purpose of the relief valve 18 is to be able to set in advance the maximum pressure that the measuring device can withstand (i.e. the maximum pressure allowed). When the pressure in the test body 1 exceeds the maximum allowable pressure of the system, the safety valve 18 is opened rapidly to release the pressure so as to prevent emergency situations such as explosion.
The embodiment of the invention also provides a method for testing the heat conductivity coefficient of the gas-liquid component, which comprises the following steps:
The first step: the measuring device keeps a sealing state, and vacuumizes the test body 1;
And a second step of: filling the test body 1 with a solution to be tested, and immersing the heating coil 14 in the liquid level of the solution to be tested;
And a third step of: opening a cooling water circuit in the heat exchanger 11; opening the first stop valve 5, the bypass valve 9 and the second stop valve 10, and circulating the condensed water in the condensing coil 3, the water tank 7 and the heat exchanger 11; starting a temperature controller 13 and heating a heating coil 14;
fourth step: adjusting the power of the temperature controller 13 and the flow rate of condensate water to make the temperature and the pressure of the solution to be measured reach an equilibrium state; acquiring a gas phase and liquid phase heat conductivity coefficient test value of the solution to be tested through a data acquisition instrument 6;
Fifth step: returning to the fourth step, changing the power of the temperature controller 13 and the flow rate of condensate water to obtain the gas phase and liquid phase heat conductivity coefficient test values of the solution to be measured at different temperatures and pressures until the measurement is finished.
In the method of the foregoing embodiment, as a preferred example, the fourth step specifically includes: heating quantity of the heating coil 14 is regulated by the temperature controller 13; regulating and controlling the water flow of the condensed water loop by regulating the opening of the bypass valve 9; the opening of the constant pressure valve 17 is controlled, so that the temperature and the pressure of the solution to be measured reach an equilibrium state, and the working condition required by measurement is met.
The measuring device of the embodiment can simultaneously measure the heat conductivity coefficients of the gas phase and the liquid phase of the solution to be measured, and can also measure the heat conductivity coefficients of the gaseous component and the liquid component under different balanced working conditions.
In the measuring device of the above embodiment, the temperature, pressure, and concentration of the measured liquid may be constant and adjustable. The method specifically comprises the following steps: the heating coil 14 heats the solution to be tested in the test body 1 so that the solution to be tested evaporates or boils off the gas (or low boiling point component); starting the solution pump 8, circulating condensed water from the water tank 7 to the condensing coil 3 through the solution pump 8 and the heat exchanger 11, taking away heat of gas evaporated from the upper space in the test body 1, cooling and condensing part of the gas on the outer surface of the condensing coil 3, and taking away the condensation heat to the cooling tower by the cooling water system in the heat exchanger 11. The temperature and pressure in the test body 1 are controlled by the temperature controller 13 and the water flow in the condensing coil 3, and finally the temperature and pressure required by the gas-liquid two-state test are achieved. The temperature and pressure in the test body 1 can be adjusted by adjusting the heating quantity of the heating coil 14 (i.e. adjusting the temperature controller 13), the water flow of the condensed water loop (i.e. adjusting the opening of the bypass valve 9) and the opening of the constant pressure valve 17, so as to finally reach the temperature and pressure required by the gas-liquid two-state test. In the case of binary or multi-element solutions, the control of temperature and pressure can determine the required concentration test requirements.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the specific embodiments described above, and that the above specific embodiments and descriptions are provided for further illustration of the principles of the present invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. The scope of the invention is defined by the claims and their equivalents.
Claims (7)
1. The device for measuring the heat conductivity coefficient of the gas-liquid component is characterized by comprising a test body (1), a gas-phase heat conductivity coefficient tester (2), a condensing coil (3), a liquid-phase heat conductivity coefficient tester (4), a first stop valve (5), a data acquisition instrument (6), a water tank (7), a solution pump (8), a second stop valve (10), a heat exchanger (11), a liquid-phase temperature sensor (12), a temperature controller (13), a heating coil (14), a gas-phase temperature sensor (16), a constant pressure valve (17) and a pressure sensor (20);
The gas phase heat conductivity coefficient tester (2) and the liquid phase heat conductivity coefficient tester (4) are respectively arranged on the test body (1); when in use, the gas phase heat conductivity coefficient tester (2) is positioned above the liquid level in the test body (1), and the liquid phase heat conductivity coefficient tester (4) is positioned below the liquid level in the test body (1);
the condensing coil (3) is fixedly connected in the inner cavity of the test body (1), the water outlet end of the condensing coil (3) is connected with the first water inlet end of the water tank (7) through a first pipeline, and the first stop valve (5) is connected in the first pipeline; the water outlet end of the water tank (7) is connected with the water inlet end of the heat exchanger (11) through a second pipeline, and the solution pump (8) and the second stop valve (10) are respectively connected in the second pipeline; the water outlet end of the heat exchanger (11) is connected with the water inlet end of the condensing coil (3);
The heating coil (14) is fixedly connected in the inner cavity of the test body (1), and the temperature controller (13) is connected with the heating coil (14);
The liquid phase temperature sensor (12) and the gas phase temperature sensor (16) are respectively and fixedly connected to the test body (1); the constant pressure valve (17) is communicated with the test body (1) through a third pipeline; the pressure sensor (20) is fixedly connected to the top of the test body (1);
The data output ends of the pressure sensor (20), the liquid phase temperature sensor (12), the gas phase temperature sensor (16), the constant pressure valve (17), the gas phase heat conductivity tester (2) and the liquid phase heat conductivity tester (4) are respectively connected with the data input end of the data acquisition instrument (6);
The water tank also comprises a fourth pipeline and a bypass valve (9), one end of the fourth pipeline is connected with the second pipeline, the other end of the fourth pipeline is connected with the second water inlet end of the water tank (7), and the bypass valve (9) is connected in the fourth pipeline;
the condensing coil (3), the water tank (7) and the heat exchanger (11) form a condensing device, and the condensing device adjusts the temperature of the gas in the test body (1);
Heating quantity of the heating coil (14) is regulated through a temperature controller (13), and water flow of the condensate water loop is regulated through regulating opening of a bypass valve (9); controlling the opening of the constant pressure valve (17) so as to ensure that the temperature and the pressure of the solution to be measured reach an equilibrium state and meet the working condition required by measurement; the device is used for measuring the heat conductivity coefficients of the gas phase and the liquid phase of the solution to be measured and measuring the heat conductivity coefficients of the gaseous component and the liquid component under different balanced working conditions.
2. The device for measuring the thermal conductivity of a gas-liquid component according to claim 1, further comprising a sight glass (15), said sight glass (15) being fixedly connected to the test body (1).
3. The device for measuring the thermal conductivity of a gas-liquid composition according to claim 2, characterized in that said mirrors (15) are at least three, wherein a first mirror (15) is opposite the condensing coil (3) and a second mirror (15) is opposite the liquid level inside the test body (1); the third sight glass (15) is positioned at the top of the test body (1).
4. A device for measuring the thermal conductivity of a gas-liquid composition according to claim 3, further comprising an illumination lamp (19), the light-emitting surface of the illumination lamp (19) being opposite to the third mirror (15).
5. The device for measuring the heat conductivity coefficient of the gas-liquid component according to claim 1, wherein the test body (1), the water tank (7), the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are all provided with an outer wall heat insulation layer.
6. The device for measuring the thermal conductivity of a gas-liquid component according to claim 1, further comprising a safety valve (18), wherein the safety valve (18) is fixedly connected to the top of the test body (1) and is communicated with the test body (1).
7. A method of measuring the thermal conductivity of a gas-liquid composition using the apparatus of claim 1, the method comprising:
The first step: the measuring device keeps a sealing state, and vacuumizes the test body (1);
and a second step of: filling a solution to be tested into the test body (1), and immersing a heating coil (14) in the liquid level of the solution to be tested;
And a third step of: opening a cooling water loop in the heat exchanger (11); opening a first stop valve (5), a bypass valve (9) and a second stop valve (10), and enabling condensed water to circularly flow in the condensing coil (3), the water tank (7) and the heat exchanger (11); starting a temperature controller (13) to heat the heating coil (14);
Fourth step: adjusting the power of a temperature controller (13) and the flow of condensate water to ensure that the temperature and the pressure of the solution to be measured reach an equilibrium state; acquiring a gas phase and liquid phase heat conductivity coefficient test value of the solution to be tested through a data acquisition instrument (6);
fifth step: and returning to the fourth step, changing the power of the temperature controller (13) and the flow rate of condensate water to obtain the gas phase and liquid phase heat conductivity coefficient test values of the solution to be measured at different temperatures and pressures until the measurement is finished.
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| CN201810233414.7A CN108344768B (en) | 2018-03-21 | 2018-03-21 | Device and method for measuring heat conductivity coefficient of gas-liquid component |
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| CN201810233414.7A CN108344768B (en) | 2018-03-21 | 2018-03-21 | Device and method for measuring heat conductivity coefficient of gas-liquid component |
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| CN108344768A CN108344768A (en) | 2018-07-31 |
| CN108344768B true CN108344768B (en) | 2024-04-26 |
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Citations (9)
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