Gas preheating device for tunable diode laser absorption spectrometer

Abstract

The utility model provides a gas preheating device for a tunable diode laser absorption spectrometer. The gas preheating device comprises a box body, a heating source, a temperature control system and a gas conveying device, the gas conveying device has multiple advantages in the field of heat exchangers due to the unique spiral structural design of the gas conveying device. Firstly, the surface area can be increased in the same space, the heat conduction and dissipation capacity is effectively improved, and the heat exchange efficiency is higher; secondly, heat can be more uniformly distributed on the surface of the whole heat exchanger due to the uniform layout of the spiral structure, so that the phenomenon of non-uniform local heat exchange is effectively reduced; in addition, due to the design of the spiral structure, air flow can be promoted, convection efficiency can be improved, and circulation of gas in the conveying system is more stable. According to the gas preheating device, the detected gas with stable temperature can be provided, so that the detection performance and the sensitivity of the tunable diode laser absorption spectrometer are effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of gas preheating, and in particular to a gas preheating device for a tunable diode laser absorption spectrometer. Background Art

[0002] Isotope detection is a technology that obtains key information by measuring the mass difference of the same atoms in the same element. In marine oil and gas detection, the detection of carbon isotopes in carbon compounds can provide a variety of useful information for the exploration and subsequent exploitation of oil and gas systems, including the origin, migration path, geological process and source of oil and gas.

[0003] In the process of isotope detection, the performance of optical devices and gas absorption coefficient are easily affected by temperature changes. For example, when using a tunable diode laser absorption spectrometer to detect isotopes of gas, changes in gas temperature can easily cause fluctuations in the spectral signal, which in turn reduces the detection accuracy of the tunable diode laser absorption spectrometer. Utility Model Content

[0004] The purpose of the present application is to solve at least one of the above-mentioned technical defects, especially the technical defect in the prior art that changes in gas temperature easily lead to fluctuations in spectral signals, thereby reducing the detection accuracy of the tunable diode laser absorption spectrometer.

[0005] The present application provides a gas preheating device for a tunable diode laser absorption spectrometer, the device comprising a box, a heating source, a temperature control system and a gas delivery device;

[0006] There are multiple heating sources, all of which are made of semiconductors, and the hot ends of the semiconductors are distributed around the bottom of the box, and are used to perform water bath heating on the liquid in the box;

[0007] The temperature control system is arranged on the surface of the box body, and is used to monitor the water bath temperature in the box body in real time, and adjust the working state of the heating source according to the monitoring result to keep the water bath temperature in the box body constant;

[0008] The gas delivery device is a spiral heat exchanger, which is arranged in the center of the box, and the air inlet and the air outlet both extend out of the top of the box, the air inlet is used to receive the gas to be tested, and the air outlet is used to output the heated gas to be tested to the tunable diode laser absorption spectrometer.

[0009] Optionally, the temperature control system includes a temperature sensor and a controller;

[0010] The temperature sensor is used to monitor the water bath temperature in the box in real time and send the monitoring result to the controller;

[0011] The controller is used to determine the adjustment amount of the water bath temperature in the box according to the monitoring result, and adjust the working state of the heating source according to the adjustment amount to keep the water bath temperature in the box constant.

[0012] Optionally, the temperature control system is also used to control the on and off of the heating source.

[0013] Optionally, the gas delivery device controls the flow speed and flow direction of the gas to be tested through a valve and a delivery pump.

[0014] Optionally, after the temperature of the gas to be measured is detected by a temperature detection module in the tunable diode laser absorption spectrometer and reaches a standard, the temperature is output to the tunable diode laser absorption spectrometer through the gas outlet.

[0015] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0016] The present application provides a gas preheating device for a tunable diode laser absorption spectrometer, the device comprising a box, a heating source, a temperature control system and a gas delivery device; wherein the present application has multiple heating sources, all of which are made of semiconductors, and the hot ends of each semiconductor are distributed around the bottom of the box, and are used to water-bath heat the liquid in the box, so that relatively uniform and effective heating can be achieved, and electrical energy can be efficiently converted into thermal energy through semiconductors, without generating additional energy waste, and thus having a high energy utilization efficiency; the temperature control system of the present application is arranged on the surface of the box, and is used to monitor the water bath temperature in the box in real time, and adjust the working state of the heating source according to the monitoring results to keep the water bath temperature in the box constant; and the gas delivery device is a spiral heat exchanger, the spiral heat exchanger is arranged in the center of the box, and the air inlet and the air outlet both extend out of the top of the box, the air inlet is used to receive the gas to be tested, and the air outlet is used to output the heated gas to be tested to the tunable diode laser absorption spectrometer; the gas delivery device of the present application, with its unique spiral structure design, has multiple advantages in the field of heat exchangers. First, the increased surface area in the same space effectively improves the ability to conduct and dissipate heat, making the heat exchange efficiency higher; second, the uniform layout of the spiral structure allows the heat to be more evenly distributed on the entire heat exchanger surface, effectively reducing the local heat exchange unevenness; in addition, the design of the spiral structure can not only promote air flow, but also improve convection efficiency, making the gas flow more stable in the delivery system. The gas preheating device of the present application can provide a stable temperature of the measured gas, thereby effectively improving the detection performance and sensitivity of the tunable diode laser absorption spectrometer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic diagram of the structure of a gas preheating device for a tunable diode laser absorption spectrometer provided in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of a semiconductor heating process provided in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of the control process of a temperature control system provided in an embodiment of the present application;

[0021] Figure 4 A system structure block diagram of a temperature control circuit provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of gas temperature obtained through flunt simulation provided in an embodiment of the present application.

[0023] In the figure: 1. Box; 2. Temperature control system; 3. Heating source; 4. Gas delivery device. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] In one embodiment, Figure 1 As shown, Figure 1 A structural schematic diagram of a gas preheating device for a tunable diode laser absorption spectrometer provided in an embodiment of the present application; the present application provides a gas preheating device for a tunable diode laser absorption spectrometer, the device comprising a box 1, a heating source 3, a temperature control system 2 and a gas delivery device 4.

[0026] There are multiple heating sources 3 , all of which are made of semiconductors. The hot ends of the semiconductors are distributed around the bottom of the box 1 and are used to perform water bath heating on the liquid in the box 1 .

[0027] The temperature control system 2 is arranged on the surface of the box 1, and is used to monitor the water bath temperature in the box 1 in real time, and adjust the working state of the heating source 3 according to the monitoring result to keep the water bath temperature in the box 1 constant.

[0028] The gas delivery device 4 is a spiral heat exchanger, which is arranged in the center of the box body 1, and the air inlet and the air outlet both extend out of the top of the box body 1. The air inlet is used to receive the gas to be tested, and the air outlet is used to output the heated gas to be tested to the tunable diode laser absorption spectrometer.

[0029] In this embodiment, Figure 1 As shown, the gas preheating device of the present application may include a housing 1, a heating source 3, a temperature control system 2 and a gas delivery device 4. Among them, a water bath liquid may be loaded in the housing 1, and the water bath liquid may be water or other liquids that can be heated. The specific setting may be based on the actual situation and is not limited here. The heating source 3 of the present application may be multiple, and all are made of semiconductors. The present application may set the hot ends of each semiconductor around the bottom of the inner cavity of the housing 1. In this way, after power is turned on, the water bath liquid in the housing 1 can be heated by multiple heating sources 3, and the temperature of the water bath liquid can be maintained at a constant state, so that the gas in the gas delivery device 4 can be heated by water bath heating.

[0030] It is understandable that, unlike the traditional resistance wire heating method, the present application uses semiconductors for heating, such as Figure 2 As shown, when the semiconductor material is energized, electrons will move in the P-type and N-type semiconductors and the connected metal bridges. Among them, the energy of the metal bridge in the semiconductor belongs to the Fermi level, the energy of the P-type semiconductor is lower than the Fermi level, and the energy of the N-type semiconductor is higher than the Fermi level. When the electrons move from the high energy level to the low energy level, heat will be released at the hot end of the semiconductor. Therefore, the present application uses a heating source 3 made of semiconductor to heat the water bath liquid in the box 1, which can not only efficiently convert electrical energy into thermal energy, but also does not generate additional energy waste, thereby having a higher energy utilization efficiency.

[0031] Furthermore, the present application adopts water bath heating to heat the gas in the gas delivery device 4. During the water bath heating process, after the heating source 3 heats the water, the heat is transferred to the heated gas through the gas delivery device 4 through the convection heat transfer effect of the water, thereby heating it. Among them, convection heating here refers to the process of transferring heat through a fluid (such as water), which can achieve relatively uniform and effective heating. During water bath heating, the water temperature in the box 1 is maintained in a relatively stable range, and the heated gas in the gas delivery device 4 will take away heat through the flow, thereby transferring the heat to the heated gas.

[0032] Furthermore, in order to make the water bath temperature in the box 1 constant, the present application can install a temperature control system 2 on the surface of the box 1, and the temperature control system 2 can receive the user's control command through the control panel of the peripheral device, and perform corresponding control operations according to the control command. For example, the temperature control system 2 of the present application can receive the start command sent by the user through the control panel, and start the relevant equipment under the start command to monitor the water bath temperature in the box 1 in real time, and adjust the working state of the heating source 3 according to the monitoring results to keep the water bath temperature in the box 1 constant; and when the user clicks the close command in the control panel, the monitoring and control operations can be stopped. Of course, the user can also set a preset temperature threshold through the control panel, so that the temperature control system 2 can adjust the working state of the heating source 3 according to the preset temperature threshold so that the water bath temperature in the box 1 reaches the preset temperature threshold.

[0033] In addition, in order to improve the heat exchange efficiency, the present application can set the gas delivery device 4 as a spiral heat exchanger, and set the spiral heat exchanger in the center of the box body 1, and the air inlet and the air outlet both extend out of the top of the box body 1, so that the gas to be tested can be received through the air inlet, the gas to be tested can be heated through the spiral structure, and the heated gas to be tested can be output to the tunable diode laser absorption spectrometer through the air outlet, so that the spectral signal fluctuation caused by the gas temperature change can be reduced, thereby improving the stability and clarity of the spectral signal, which is helpful to more accurately analyze the spectral characteristics of the target gas.

[0034] In the above embodiment, the device includes a box 1, a heating source 3, a temperature control system 2 and a gas delivery device 4; wherein, there are multiple heating sources 3 of the present application, and they are all made of semiconductors, and the hot ends of each semiconductor are distributed around the bottom of the box 1, which are used to perform water bath heating on the liquid in the box 1, so that relatively uniform and effective heating can be achieved, and electrical energy can be efficiently converted into thermal energy through semiconductors, and no additional energy waste will be generated, so it has a high energy utilization efficiency; the temperature control system 2 of the present application is arranged on the surface of the box 1, and is used to monitor the water bath temperature in the box 1 in real time, and adjust the working state of the heating source 3 according to the monitoring results to keep the water bath temperature in the box 1 constant; and the gas delivery device 4 is a spiral heat exchanger, which is arranged in the center of the box 1, and the air inlet and the air outlet both extend out of the top of the box 1, the air inlet is used to receive the gas to be tested, and the air outlet is used to output the heated gas to be tested to the tunable diode laser absorption spectrometer; the gas delivery device 4 of the present application, with its unique spiral structure design, has multiple advantages in the field of heat exchangers. First, the increased surface area in the same space effectively improves the ability to conduct and dissipate heat, making the heat exchange efficiency higher; second, the uniform layout of the spiral structure allows the heat to be more evenly distributed on the entire heat exchanger surface, effectively reducing the local heat exchange unevenness; in addition, the design of the spiral structure can not only promote air flow, but also improve convection efficiency, making the gas flow more stable in the delivery system. The gas preheating device of the present application can provide a stable temperature of the measured gas, thereby effectively improving the detection performance and sensitivity of the tunable diode laser absorption spectrometer.

[0035] In one embodiment, the temperature control system 2 includes a temperature sensor and a controller.

[0036] The temperature sensor is used to monitor the water bath temperature in the box 1 in real time and send the monitoring result to the controller.

[0037] The controller is used to determine the adjustment amount of the water bath temperature in the box body 1 according to the monitoring result, and adjust the working state of the heating source 3 according to the adjustment amount to keep the water bath temperature in the box body 1 constant.

[0038] In this embodiment, the temperature control system 2 may include a temperature sensor and a controller. The temperature sensor can monitor the water bath temperature in the box 1 in real time and send the monitoring results to the controller, so that the controller can determine the adjustment amount of the water bath temperature in the box 1 based on the monitoring results, and adjust the working state of the heating source 3 according to the adjustment amount to keep the water bath temperature in the box 1 constant.

[0039] Indicatively, Figure 3 , 4 As shown, Figure 3 A schematic diagram of the control process of the temperature control system 2 provided in an embodiment of the present application; Figure 4 A system structure block diagram of a temperature control circuit provided in an embodiment of the present application; Figure 3 It can be seen that the temperature control system 2 of the present application can collect the water bath temperature in the box 1 through the sensor and send the detection value to the controller. The controller can determine the deviation value according to the preset set temperature and the current detection value, and then output the corresponding control amount according to the deviation value to control the actuator through the control amount. The actuator here refers to the heating source 3 of the present application. When the controlled amount of the heating source 3 is adjusted, the water bath temperature in the box 1 can reach the set temperature. Further, by Figure 4 It can be seen that the temperature control system 2 of the present application can be composed of a single-chip microcomputer control circuit, a temperature acquisition circuit and a semiconductor heating plate driving circuit. The single-chip microcomputer can be an STM32 minimum system, which includes an LCD interface circuit, a temperature detection circuit and an I / O output, etc. The above-mentioned temperature control process of the present application can be realized through the temperature control circuit.

[0040] In one embodiment, the temperature control system 2 is also used to control the on and off of the heating source 3 .

[0041] In this embodiment, before heating the gas to be tested, preparation work of the gas preheating device can be performed, including checking the working status of the heating source 3 (semiconductor hot end), the temperature control system 2 and the gas delivery device 4 to ensure the normal operation of the equipment. Then, the present application can start the heating source 3 through the temperature control system 2, that is, the semiconductor hot end starts to be powered on. As the current passes through the semiconductor hot end, the electrons inside the semiconductor material will generate heat energy, causing the temperature inside the material to rise, thereby conducting the heat to the water bath liquid in the box 1. When water bath heating is not required, the heating source 3 can also be turned off by the temperature control system 2 to achieve the effect of controlling the start and stop of the gas preheating device.

[0042] In one embodiment, the gas delivery device 4 controls the flow speed and flow direction of the gas to be tested through a valve and a delivery pump.

[0043] In this embodiment, since the gas delivery device 4 of the present application heats the gas to be tested and then delivers it to the tunable diode laser absorption spectrometer, and the tunable diode laser absorption spectrometer has certain requirements for the gas temperature. Therefore, the present application can control the input and output of the gas to be tested by installing a valve on the gas delivery device 4, and connect the gas inlet through a delivery pump to adjust the flow speed and flow direction of the gas to be tested delivered to the gas delivery device 4, thereby effectively controlling the heating temperature and heating efficiency of the gas to be tested.

[0044] In one embodiment, after the temperature of the gas to be measured is detected by a temperature detection module in the tunable diode laser absorption spectrometer and reaches a standard, the temperature is output to the tunable diode laser absorption spectrometer through the gas outlet.

[0045] In this embodiment, since the tunable diode laser absorption spectrometer is provided with a temperature detection module, and the distance between the gas outlet of the gas delivery device 4 of the present application and the tunable diode laser absorption spectrometer is very short. Therefore, the present application can control the gas output of the gas outlet through the valve, and detect the output gas temperature through the temperature detection module provided in the tunable diode laser absorption spectrometer. When the temperature detection module detects that the output gas temperature reaches the preset temperature value, the gas outlet valve can be adjusted to ensure that the gas to be tested in the gas delivery device 4 that meets the temperature standard is delivered to the tunable diode laser absorption spectrometer.

[0046] In a specific implementation method, the present application can use drilling gas as the gas to be tested. Since the main component of drilling gas is methane, the temperature of the generally mined drilling gas can be set to 25°C, and the gas is heated by the convection heat exchange method based on water bath heating in the present application. After the gas to be tested reaches a preset temperature, the pre-heated gas to be tested is output to the tunable diode laser absorption spectrometer through the gas delivery device 4 for further experiments or analysis.

[0047] Indicatively, Figure 5 As shown, Figure 5 A schematic diagram of the gas temperature obtained through flunt simulation provided in the embodiment of the present application; the present application can set the preset temperature of the gas preheating device to 30°C, and input 25°C gas methane into the gas delivery device 4 for convective heat exchange. The output temperature of the gas obtained through flunt simulation is 29.5131°C, reaching the expected temperature. Therefore, the gas preheating device of the present application can effectively increase the temperature of the gas sample and enhance the signal intensity of its absorption spectrum, thereby improving the detection performance and sensitivity of the tunable diode laser absorption spectrometer.

[0048] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0049] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can refer to each other.

[0050] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gas preheating device for a tunable diode laser absorption spectrometer, characterized in that: The device comprises a box, a heating source, a temperature control system and a gas delivery device; There are multiple heating sources, all of which are made of semiconductors, and the hot ends of the semiconductors are distributed around the bottom of the box, and are used to perform water bath heating on the liquid in the box; The temperature control system is arranged on the surface of the box body, and is used to monitor the water bath temperature in the box body in real time, and adjust the working state of the heating source according to the monitoring result to keep the water bath temperature in the box body constant; The gas delivery device is a spiral heat exchanger, which is arranged in the center of the box, and the air inlet and the air outlet both extend out of the top of the box, the air inlet is used to receive the gas to be tested, and the air outlet is used to output the heated gas to be tested to the tunable diode laser absorption spectrometer.

2. The gas preheating device according to claim 1, characterized in that: The temperature control system includes a temperature sensor and a controller; The temperature sensor is used to monitor the water bath temperature in the box in real time and send the monitoring result to the controller; The controller is used to determine the adjustment amount of the water bath temperature in the box according to the monitoring result, and adjust the working state of the heating source according to the adjustment amount to keep the water bath temperature in the box constant.

3. The gas preheating device according to claim 1, characterized in that: The temperature control system is also used to control the on and off of the heating source.

4. The gas preheating device according to claim 1, characterized in that: The gas delivery device controls the flow speed and flow direction of the gas to be tested through a valve and a delivery pump.

5. The gas preheating device according to claim 1, characterized in that: After the temperature of the gas to be measured is detected by the temperature detection module in the tunable diode laser absorption spectrometer and reaches a standard, the temperature is output to the tunable diode laser absorption spectrometer through the gas outlet.

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