CN118817117B - A TDLAS high temperature and high pressure calibration system - Google Patents
A TDLAS high temperature and high pressure calibration systemInfo
- Publication number
- CN118817117B CN118817117B CN202411139887.2A CN202411139887A CN118817117B CN 118817117 B CN118817117 B CN 118817117B CN 202411139887 A CN202411139887 A CN 202411139887A CN 118817117 B CN118817117 B CN 118817117B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/002—Calibrated temperature sources, temperature standards therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/005—Calibration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
本发明公开了一种TDLAS高温高压校准系统，包括高压舱、高压控制模块、高温管式炉、温度控制及显示模块、测量光路，高压舱包括分别用于密封高压舱两端的左端盖法兰和右端盖法兰，高压控制模块用于提供预定压强的目标气体并均匀填充到炉管中心的测量区域；高温管式炉置于高压舱的内部，包括炉管、加热丝、控温热电偶、测温热电偶；温度控制及显示模块用于对高温管式炉进行PID控温并显示炉管中心的温度；测量光路位于炉管的中轴线上，包括第一导光柱、测量区域、第二导光柱，测量区域位于第一导光柱和第二导光柱之间。本发明使所有承受高温和高压的部件完全独立，克服了材料高温屈服强度限制，可实现高温高压环境下TDLAS传感器的校准。
The present invention discloses a TDLAS high-temperature and high-pressure calibration system, comprising a high-pressure chamber, a high-pressure control module, a high-temperature tube furnace, a temperature control and display module, and a measurement optical path. The high-pressure chamber comprises a left end cover flange and a right end cover flange for sealing the high-pressure chamber at both ends, respectively. The high-pressure control module is used to provide a target gas at a predetermined pressure and evenly fill it into a measurement area at the center of the furnace tube. The high-temperature tube furnace is placed inside the high-pressure chamber and comprises a furnace tube, a heating wire, a temperature-control thermocouple, and a temperature-measuring thermocouple. The temperature control and display module is used to perform PID temperature control on the high-temperature tube furnace and display the temperature at the center of the furnace tube. The measurement optical path is located on the central axis of the furnace tube and comprises a first light guide column, a measurement area, and a second light guide column, with the measurement area located between the first and second light guide columns. The present invention makes all components subjected to high temperature and high pressure completely independent, overcomes the high-temperature yield strength limitation of the material, and can realize the calibration of TDLAS sensors in high-temperature and high-pressure environments.
Description
Technical Field
The invention belongs to the technical field of gas temperature testing based on an absorption spectroscopy, and particularly relates to a TDLAS (Tunable Diode Laser Absorption Spectroscopy ) high-temperature high-pressure calibration system.
Background
The laser absorption spectrum technology uses laser as an excitation light source, obtains measurement information by sensing an electromagnetic field related to the internal energy distribution and energy level transition of a measured object, has the advantages of non-contact, quick response, easy realization of two-dimensional field reconstruction and the like, and is particularly suitable for flow field measurement with quick change of combustion parameters of an aeroengine. However, for the high temperature and high pressure environments common to the engine and industrial field application, the problem of inconsistent measurement and calibration environments is commonly existed, namely, a TDLAS temperature sensor is usually calibrated under the condition of high pressure and high temperature in a laboratory, the impact broadening is affected by the actual measurement under the high pressure environment, the linear change of an absorption spectrum is obvious, and the deviation of a final measurement result is larger. A typical overseas research work is a TDLAS high-temperature and high-pressure calibration device built by Hanson team of Stanford university, a combination of a tube furnace and a high-temperature and high-pressure resistant air chamber is adopted, but a main body of the high-pressure resistant air chamber is subjected to high temperature and high pressure, is limited by the high-temperature yield strength of self materials, can only achieve 700K and 3MPa, and cannot meet the high-temperature and high-pressure calibration requirements of a TDLAS sensor for an engine and industrial field test.
Disclosure of Invention
The invention aims to provide a TDLAS high-temperature high-pressure calibration system, which enables all parts bearing high temperature and high pressure to be completely independent, overcomes the limitation of high-temperature yield strength of materials, and can realize the calibration of a TDLAS sensor in high-temperature (1000 ℃) and high-pressure (3 MPa) environments.
One aspect of the invention provides a TDLAS high-temperature high-pressure calibration system, which comprises a high-pressure chamber, a high-pressure module, a high-temperature tube furnace, a temperature control and display module and a measuring light path; the high-pressure chamber comprises a left end cover flange and a right end cover flange which are respectively used for sealing two ends of the high-pressure chamber, a high-pressure air inlet port is welded at the upper end of the high-pressure chamber and connected through a stainless steel clamping sleeve connector, the high-pressure chamber is used for providing target gas with preset pressure and uniformly filling the target gas into a measuring area at the center of a furnace tube, the high-temperature tube furnace is arranged in the high-pressure chamber and comprises the furnace tube, a heating wire, a temperature control thermocouple and a temperature thermocouple, the heating wire is wound on the surface of the furnace tube, the temperature control thermocouple is used for PID temperature control feedback of the high-temperature tube furnace, the temperature thermocouple is arranged at the center of the furnace tube and used for temperature monitoring at the center of the furnace tube, a power supply and thermocouple port are welded at the upper end of the high-pressure chamber and are used for connecting the heating wire, the temperature control thermocouple and the temperature control and the temperature display module, the temperature control and the temperature display module are used for PID temperature control of the high-temperature tube furnace and display of the furnace tube, the measuring light path is arranged on the central axis, the measuring light path comprises a first light guide column, a measuring area, a second light guide column and a second light guide column, a first guide column and a second guide column are arranged on the left end cover and a right end cover, and a first light guide column are respectively arranged on the surface of the first light guide column.
Preferably, the measuring light path further comprises a collimating lens, a left end cover quartz window piece and a right end cover quartz window piece, wherein the collimating lens is fixedly arranged on the left side of the left end cover sealing flange, and the left end cover quartz window piece and the right end cover quartz window piece are respectively arranged at the centers of the left end cover flange and the right end cover flange.
Preferably, the hyperbaric chamber further comprises three water-cooled jackets, namely a first water-cooled jacket, a second water-cooled jacket and a third water-cooled jacket in sequence from left to right, and annular water-cooled jackets are respectively arranged at the centers of the left end cover flange and the right end cover flange and used for cooling the left end cover flange, the right end cover flange, the quartz window sheets, the first light guide column and the second light guide column.
Preferably, the main body of the high-pressure cabin is cylindrical, stainless steel is adopted, and the three water cooling jackets are stainless steel cylinders.
Preferably, the high-pressure control module comprises a high-pressure gas cylinder, a pressure controller, an atomizer and a heat tracing pipe, wherein the high-pressure gas cylinder is used for filling high-pressure gas, the pressure controller is used for controlling the pressure value of the gas to a preset value, the atomizer is used for atomizing distilled water into water vapor, and the heat tracing pipe is used for heating the gas.
Preferably, the high-pressure gas cylinder, the pressure controller, the atomizer and the heat tracing pipe are connected through metal pipes and sealed through stainless steel cutting sleeve joints.
Preferably, the high-temperature tube furnace further comprises a heat insulation layer which is wrapped on the outer layer of the furnace tube, the high-temperature tube furnace is a three-section tube furnace, the heating wire is three-section temperature control, and three temperature control thermocouples are uniformly distributed between the heating wire and the heat insulation layer and used for carrying out PID temperature feedback on the high-temperature tube furnace.
The temperature control and display module comprises a supporting plate, a touch display screen and a control circuit board, wherein the supporting plate is used for supporting a high-pressure chamber and a built-in high-temperature tube furnace, the heating wire, the temperature control thermocouple and the temperature thermocouple are connected with the control circuit board through a power supply and a thermocouple interface, and the touch display screen is used for displaying the temperature in real time and setting temperature control parameters.
According to the TDLAS high-temperature high-pressure calibration system provided by the invention, all parts bearing high temperature and high pressure are completely independent through the high-pressure cabin built-in high-temperature tube furnace, the limit of high-temperature yield strength of materials is overcome, and the calibration of the TDLAS sensor in high-temperature (1000 ℃) and high-pressure (3 MPa) environments can be realized.
Drawings
For a clearer description of the technical solutions of the present invention, the following description will be given with reference to the attached drawings used in the description of the embodiments of the present invention, it being obvious that the attached drawings in the following description are only some embodiments of the present invention, and that other attached drawings can be obtained by those skilled in the art without the need of inventive effort:
fig. 1 is a schematic structural diagram of a TDLAS high temperature and high pressure calibration system according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a high voltage control module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a temperature control and display module according to an embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides a TDLAS high-temperature high-pressure calibration system, which comprises a high-pressure chamber, a high-pressure control module 14, a high-temperature tube furnace, a temperature control and display module 10 and a measuring light path.
Fig. 1 is a schematic structural diagram of a TDLAS high temperature and high pressure calibration system according to an embodiment of the present invention, and as shown in fig. 1, a main body of a hyperbaric chamber is of a cylindrical design, and is made of stainless steel. The main body of the hyperbaric chamber is water-cooled in three sections, namely a first water-cooled jacket 9, a second water-cooled jacket 12 and a third water-cooled jacket 15 in sequence from left to right. The three water cooling jackets are made of stainless steel cylinders with wall thickness of 3mm, and are welded with phi 6mm quick-plug connectors up and down. The cooling water inlet principle is 'lower inlet and upper outlet', and the upper end of the high-pressure cabin is sequentially provided with a first water jacket water outlet 8, a second water jacket water outlet 11 and a third water jacket water outlet 16. The hyperbaric chamber comprises a left end cover flange 1 and a right end cover flange 17 for sealing the two ends of the hyperbaric chamber respectively. The center of the left end cover flange 1 is additionally provided with a left end cover quartz window 4 for transmitting a measuring light path, and the left end cover flange 3 and the left end cover rubber sealing ring 5 are utilized for sealing. The center of the left end cover flange 1 is provided with a left end cover annular water cooling jacket 7 which is used for cooling the left end cover flange 1, the left end cover quartz window sheet 4, the left end cover rubber sealing ring 5 and the first light guide column 30 and is used for installing and fixing the first light guide column 30. The left end cover flange 1 is provided with a left end cover water cooling jacket water inlet 2 and a left end cover water cooling jacket water outlet 6 in sequence from top to bottom, and the cooling water inlet sequence is 'lower inlet and upper outlet'. The left end cover and the right end cover of the high-pressure cabin are symmetrically arranged, and the water cooling and sealing installation refers to the left end design and comprises a right end cover sealing flange 19, a right end cover rubber sealing ring 21, a left end cover annular water cooling jacket 23, a right end cover water cooling jacket water inlet 22 and a right end cover water cooling jacket water outlet 18.
The high-temperature tube furnace is used for providing a uniform and stable constant-temperature area for the system, and is arranged in the high-pressure cabin. In the embodiment shown in fig. 1, the high temperature tube furnace includes furnace tube 24, heater wire 25, temperature control thermocouple 29, and temperature thermocouple 31. The three-section type tube furnace is arranged in the high-pressure cabin, and is heated by adopting a heating wire 25, wherein the heating wire 25 is directly wound on the surface of the furnace tube 24, and the heating wire 25 is, for example, a nickel-chromium 2080 heating wire. The furnace tube 24 is made of aluminum oxide, for example, the length is 50cm, the inner diameter is 4cm, the wall thickness is 0.5cm, and the upper temperature limit is 1700 ℃ when the furnace tube is used for a long time. The heat insulation layer 27 is made of high-temperature-resistant aluminum silicate heat insulation cotton and is wrapped on the outer layer of the furnace tube 24, for example, the thickness is 1cm, and the temperature is 1700 ℃. The heating wire 25 is three-section temperature control, three temperature control thermocouples 29 are uniformly distributed between the heating wire 25 and the heat insulation layer 27 and used for PID (proportion-integral-derivative) temperature feedback of the tube furnace, a temperature thermocouple 31 is arranged in the center of the furnace tube 24, and the temperature control thermocouples 29 and the temperature thermocouple 31 are connected with the temperature control and display module 10 through a power supply and thermocouple interface. The upper end of the hyperbaric chamber is welded with a power supply and a thermocouple interface, which are used for connecting the heating wire 25, the temperature control thermocouple 29 and the temperature control and display module 10, and the interface is filled with epoxy resin glue for sealing. The length of the effective heating area of the furnace body is 50cm, the length of the central constant temperature area is 10cm, the temperature uniformity is less than or equal to 2 ℃ per 10cm, and the power is 1.5kW.
In this embodiment, the TDLAS measuring light path is located on the central axis of the furnace tube, and includes a collimator lens, a left end cover quartz window 4, a first light guide column 30, a measuring area 28, a second light guide column 26, and a right end cover quartz window 20. The laser emitted by the laser is collimated by a collimating lens which is fixed on the left side of the left end cover sealing flange 3. The laser sequentially passes through the left end cover quartz window 4, the first light guide column 30, the measuring area 28, the second light guide column 26 and the right end cover quartz window 20, and is received by the detector. In addition, the installation position of the collimating lens is close to the quartz window sheet 4 of the left end cover as much as possible, the installation position of the photosensitive surface of the detector is close to the quartz window sheet 20 of the right end cover as much as possible, or the collimating lens is purged by dry high-purity nitrogen, so that the interference of air on the measurement of target gases such as water vapor or CO 2 is avoided. The first light guide column 30 and the second light guide column 26 mainly serve to isolate low temperature areas at two sides of the tube furnace, in one embodiment, the first light guide column 30 and the second light guide column 26 are made of single crystal sapphire, the spectral transmission range is 0.17-5.5 μm long, the length is 20cm, the diameter is 2.5cm, and the two end faces are optically polished and processed to form a 10-degree wedge angle, so that interference effects of an optical standard tool are avoided, and the long-term working temperature is 1800 ℃.
The upper end of the high-pressure cabin is welded with a high-pressure air inlet connector, and is connected with a high-pressure control module 14 through a stainless steel clamping sleeve connector, and simultaneously is connected with a digital pressure gauge and a safety valve 13 in series. The high pressure control module 14 is configured to provide a high pressure environment for the system, and as shown in fig. 2, the high pressure control module 14 includes a high pressure gas cylinder 141, a pressure control valve 142, a pressure controller 143, an atomizer 144, and a heat trace pipe 145. All parts are connected through metal pipes and sealed through stainless steel cutting sleeve joints.
During TDLAS high-temperature high-pressure calibration with H 2 O as target gas, high-pressure gas cylinder 141 is filled with high-purity nitrogen, distilled water is firstly added into atomizer 144, the heating function of atomizer 144 is started, the temperature is kept above 110 ℃, then the heating function of heat tracing pipe 145 is started, the temperature is kept above 110 ℃ to ensure that internal vapor is not condensed, target gas is introduced into high-temperature high-pressure calibration device for 10 minutes before sealing, sealing flange 17 is sealed after target gas is uniformly filled into measuring area 28, the pressure value is controlled to a preset value through pressure controller 143, vapor is carried into measuring area 28 through high-purity nitrogen, and TDLAS temperature sensor calibration is performed after temperature pressure is stable.
When CO 2 is used as target gas, the high-pressure gas cylinder 141 is filled with corresponding standard gas, the heating function of the atomizer 144 is closed, then the heating function of the heat tracing pipe 145 is opened, the temperature is kept above 110 ℃, the target gas is introduced for 10 minutes before the high-temperature high-pressure calibration device is sealed, the sealing flange 17 is sealed after the target gas is uniformly filled in the measuring area 28, the pressure value is controlled to a preset value by the pressure controller 143, and the TDLAS temperature sensor is calibrated after the temperature and the pressure are stable.
The temperature control and display module 10 is used for high pressure cabin support and tube furnace temperature control and display. The temperature control and display module 10 in this embodiment is shown in fig. 3, and includes a support plate, a touch display screen 102, a control circuit board 106, a switch, and the like, and mainly realizes the PID temperature control function of the furnace tube of the high-temperature tube furnace and the temperature display function of the central measurement area of the furnace tube. In one embodiment, the support plates comprise a left support plate 101 and a right support plate 103, stainless steel with the thickness of 2mm is adopted to support a high-pressure chamber and a built-in tube furnace thereof, and the heating wire 25, the temperature control thermocouple 29 and the temperature control Wen Ou are connected with the control circuit board 106 through wires through a power supply and thermocouple interface and controlled by the control circuit board 106. The power supply and thermocouple interface is sealed by adopting a flange and epoxy resin pouring glue, the touch display screen 102 is used for displaying the real-time temperature and setting temperature control parameters, and the switch comprises a power switch 104 and a heating switch 105.
The working flow of the TDLAS high-temperature high-pressure calibration system is that a power switch 104 is firstly turned on, then a temperature value is set through a touch display screen 102, then a heating switch 105 is turned on, after the display temperature reaches the set temperature, a pressure control module 10 is turned on, the temperature and pressure are regulated to target pressure values, and after the temperature and the pressure are stabilized for 10 minutes, the TDLAS sensor calibration work can be carried out.
In summary, the TDLAS high-temperature high-pressure calibration system according to the embodiments of the present invention includes a high-pressure system and a high-temperature system, and the overall architecture is a high-pressure cabin internal tube furnace, which has the advantages that all components bearing high temperature and high pressure are completely independent, i.e., components bearing high pressure are not subjected to high temperature, and components bearing high temperature are not subjected to high pressure, so as to ensure safe, stable and reliable operation of the device.
Compared with the prior art, the TDLAS high-temperature high-pressure calibration system provided by the embodiment of the invention has the following beneficial effects:
(1) The invention adopts a high-temperature tube furnace structure with a high-pressure cabin, so that all parts bearing high temperature and high pressure are completely independent, the limit of high-temperature yield strength of materials is overcome, and the calibration of the TDLAS sensor in high-temperature (1000 ℃) and high-pressure (3 MPa) environments can be realized.
(2) According to the invention, the calibration of the TDLAS sensor with the target gas of H 2O、CO2 and other gases in a high-temperature and high-pressure environment can be realized through the atomizer or the replacement of the standard high-pressure gas cylinder.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the invention, which is defined by the appended claims.
Claims (5)
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| CN202411139887.2A CN118817117B (en) | 2024-08-19 | 2024-08-19 | A TDLAS high temperature and high pressure calibration system |
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| CN202411139887.2A CN118817117B (en) | 2024-08-19 | 2024-08-19 | A TDLAS high temperature and high pressure calibration system |
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| CN118817117B true CN118817117B (en) | 2025-09-05 |
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| CN103411918B (en) * | 2013-06-28 | 2015-08-05 | 中国科学院安徽光学精密机械研究所 | A kind of device of accurate measurement high-temperature gas spectrum parameter |
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| CN107434244A (en) * | 2017-09-13 | 2017-12-05 | 南京金美镓业有限公司 | A kind of composite heat shield structure of indium phosphide synthesizer |
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| CN103383189A (en) * | 2013-06-27 | 2013-11-06 | 西北核技术研究所 | Furnace tube of high-pressure high-temperature optical tubular atmosphere furnace |
| CN105180654A (en) * | 2015-09-25 | 2015-12-23 | 中国科学院上海硅酸盐研究所 | Large-pipe-diameter high-temperature graphite heating device for high-temperature microscope and refractoriness test |
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