A rapid thermogravimetric measurement platform and analysis method based on semiconductor laser heating

Abstract

The present invention belongs to the technical field of pyrolysis measurement, and specifically discloses a rapid thermogravimetric measurement platform and analysis method based on semiconductor laser heating, including a sealed box, a laser heating device, a real-time temperature measurement device, a real-time weight loss measurement device, a gas circuit system, a water cooling system, a gas detection device and a platform data acquisition terminal; it has the following advantages: the use of an external semiconductor laser emission source and an efficient water cooling system realizes rapid and stable fuel rapid thermogravimetric analysis heating, avoiding overheating damage and low-rate uncontrollable heating. Combined with real-time temperature measurement and weight loss measurement equipment, such as a precision balance and an infrared thermometer, the platform can accurately monitor the temperature and mass changes of the sample, thereby accurately controlling the pyrolysis process. The design of the sealed box and the gas circuit system ensures the stability of the experimental environment, ensures the constant flow of inert gas and accurate monitoring of gas composition.

Description

Technical Field

[0001] The present invention relates to the technical field of pyrolysis measurement, and in particular to a rapid thermogravimetric measurement platform and an analysis method based on semiconductor laser heating. Background Art

[0002] The total amount of biomass resources that can be used as energy each year is approximately equivalent to 460 million tons of standard coal. Among them, the amount of agricultural waste resources is about 400 million tons, which is converted into about 200 million tons of standard coal; the amount of forestry waste resources is about 350 million tons, which is converted into about 200 million tons of standard coal; the remaining related organic waste is about 60 million tons of standard coal. Biomass rapid pyrolysis utilization technology is an important method for efficient utilization of biomass.

[0003] Biomass rapid pyrolysis refers to the instantaneous gasification of biomass under the conditions of air isolation or supply of a small amount of air, at an ultra-high heating rate, and at an ultra-short product residence time, and then rapid condensation into liquid, which can obtain the maximum liquid yield. Thermogravimetric analysis is a method of measuring the relationship between the mass of a material and temperature or time under program-controlled temperature. By analyzing the thermogravimetric curve, the composition, thermal stability, thermal decomposition and generated products of the material and its possible intermediate products can be known. However, the heating method of the existing thermogravimetric analyzer is mainly resistance radiation heating, and the heating rate is generally 8C / s to 30C / s, so the heating rate of the traditional thermogravimetric analyzer is far from the engineering application of rapid pyrolysis of materials (especially the heating rate of biomass rapid pyrolysis generally reaches 100C / s, or even 1000C / s), and the obtained thermogravimetric analysis data often have a large deviation in guiding engineering applications. In addition, the existing thermogravimetric analyzer is limited by the heating method, consumes a lot of power, has a temperature gradient, and has a long temperature response time.

[0004] Therefore, a rapid thermogravimetric measurement platform and analysis method based on semiconductor laser heating are proposed to solve the above-mentioned problems. Summary of the invention

[0005] The present invention aims to provide a rapid thermogravimetric measurement platform and analysis method based on semiconductor laser heating to solve or improve at least one of the above-mentioned technical problems.

[0006] In view of this, a first aspect of the present invention is to provide a rapid thermogravimetric measurement platform based on semiconductor laser heating.

[0007] A second aspect of the present invention is to provide an analysis method.

[0008] The first aspect of the present invention provides a rapid thermogravimetric measurement platform based on semiconductor laser heating, comprising a sealed box, a laser heating device, a real-time temperature measuring device, a real-time weight loss measuring device, a gas circuit system, a water cooling system, a gas detection device and a platform data acquisition terminal; the outer wall of the sealed box is respectively provided with a left air inlet, a right air inlet, an exhaust port, a left laser transmitter mounting hole and a right laser transmitter mounting hole, and the lower part of the sealed box is provided with a data line collection port; the laser heating device comprises a left laser transmitter adapted to the left air inlet emitter, a right laser emitter matched with the right air inlet, an external semiconductor laser emission source and a laser emitter power supply; the external semiconductor laser emission source is electrically connected to the laser emitter power supply, the left laser emitter and the right laser emitter; the real-time temperature measurement device includes an infrared thermometer located inside the sealed box and a movable adjustable bracket for installing the infrared thermometer; the real-time weight loss measurement device includes a precision balance, heat insulation cotton and a material holding device for carrying materials stacked in sequence; the gas path device includes a The air inlet, the right air inlet and the air outlet are adapted to the air guide hose, a micro air pump and a rotor flowmeter; the micro air pump is connected to the air guide hose through the rotor flowmeter; the water cooling system includes a water cooling pump, a water cooling plate and a circulating water tank; the water cooling pump is used to drive cooling water to circulate between the water cooling plate and the circulating water tank, and the water cooling plate is fixedly assembled with the external semiconductor laser emission source; the gas detection device includes an oxygen concentration measuring instrument, a flue gas analyzer and a flue gas tar filter; the flue gas analyzer detects the concentration of oxygen in the flue gas through the flue gas tar filter The nozzle is connected to the micro air pump, and the detection end of the oxygen concentration measuring instrument is located inside the sealed box; the platform data acquisition terminal is connected to the precision balance and the infrared thermometer through a data line to obtain real-time measurement data of the precision balance and the infrared thermometer, and control the measurement frequency of the precision balance and the infrared thermometer; the platform data acquisition terminal is also used to adjust the output power of the left laser emitter and / or the right laser emitter according to the real-time measurement data, and display and analyze the calorific value and weight loss rate of the material.

[0009] In any of the above technical solutions, a disassembly door is provided at the front end of the sealed box body, and the disassembly door is connected to the sealed box body main body through a metal hinge. A door handle is provided on the outer side of the disassembly door away from the sealed box body, and a sealing rubber ring is provided close to the inner side of the sealed box body; the disassembly door squeezes the sealing rubber ring through a quick clamping tool to seal the sealed box body.

[0010] In any of the above technical solutions, the left air inlet and the right air inlet are located at the same horizontal height; and / or the left laser emitter mounting hole, the right laser emitter mounting hole and the material loading device are arranged on the same horizontal line; and / or the exhaust port is arranged directly above the material loading device; and / or the data cables of the precision balance and the infrared thermometer are connected to the platform data acquisition terminal through the data cable collection port.

[0011] In any of the above technical solutions, the left laser emitter and the right laser emitter respectively include a semiconductor laser lens, a front plano-convex lens and an extension tube sleeve, and the front plano-convex lens cooperates with the extension tube sleeve to adjust the size and intensity of the laser spot emitted by the semiconductor laser lens to the material.

[0012] In any of the above technical solutions, the extension tube sleeve is provided with an internal thread for connecting the semiconductor laser lens and the front plano-convex lens; the front plano-convex lens is located at one end of the extension tube sleeve away from the semiconductor laser lens and is fixed by an external threaded retaining ring; the distance between the front plano-convex lens and the semiconductor laser lens is 40mm-60mm; the plane side of the front plano-convex lens faces the material loading device, and the convex side of the front plano-convex lens faces the semiconductor laser lens.

[0013] In any of the above technical solutions, the infrared thermometer is fixed by a slot provided on the movable adjustable bracket, and at least one temperature measuring spot of the infrared thermometer is adjusted to be located on the material carrying device; the temperature measuring range of the infrared thermometer is between -50°C and 1650°C; the measured temperature obtained by the infrared thermometer is used to calibrate the measurement value of the precision balance when the material is heated.

[0014] In any of the above technical solutions, the material holding device includes a square thin sheet made of two layers of stainless steel wire mesh, the material is placed at the center of the upper surface of the square thin sheet, and the square thin sheet is plugged into the insulation cotton through a steel wire; wherein the precision balance has a range of 0g-120g, a graduation value of 0.1mg and an error of 0.06mg.

[0015] In any of the above technical solutions, the air hose is assembled and connected using a pneumatic joint, the micro air pump maintains the inside of the sealed box at a positive pressure of 0.1KPa-0.2KPa, and the rotor flowmeter monitors the flow change of the air hose; wherein the range of the rotor flowmeter is 1L / min-10L / min; the intake flow of the air hose is 6L / min, and the exhaust flow of the air hose is 5L / min.

[0016] In any of the above technical solutions, the fixed assembly point between the external semiconductor laser emission source and the water cooling plate is coated with silver silicone grease to maintain the operating temperature of the semiconductor laser emission source below 40°C; the water inlet of the water cooling plate is connected to the water cooling pump, and the water cooling pump is placed inside the circulating water tank.

[0017] The second aspect of the present invention provides an analysis method, comprising the following steps: S101, loading the material on the material holding device, inserting the material holding device on the insulation cotton on the precision balance to measure the mass of the material before pyrolysis; adjusting the position of the material holding device so that the laser spot is irradiated on the material and the material holding device; S102, closing the sealed box and opening the real-time weight loss measurement device and the real-time temperature measurement device. Inert gas is introduced from the left and right air inlets, and the intake flow rate is maintained at 6L / min and the exhaust flow rate is maintained at 5L / min. The exhaust port is connected to a flue gas analyzer through a flue gas tar filter to monitor the oxygen concentration; S103, when the oxygen concentration drops below 1%, the laser heating device is started, and the laser power of the laser heating device is controlled by the platform data acquisition terminal to adjust the pyrolysis temperature to 500°C and the pyrolysis rate to one of 10°C / s, 50°C / s and 100°C / s; S104, real-time measurement data of the precision balance and the infrared thermometer are obtained until the end.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] By using an external semiconductor laser emission source and a paired laser emitter, the present invention can achieve extremely fast heating speed, far exceeding the traditional resistance heating method. This allows the platform to heat the sample to the required temperature within a few seconds, meeting the requirements of rapid pyrolysis.

[0020] It is equipped with a water cooling system, including a water cooling pump, a water cooling plate and a circulating water tank, and silver silicone grease is applied between the laser emission source and the water cooling plate. These configurations effectively improve the heat conduction efficiency, while keeping the temperature of the laser emission source within a safe range, preventing overheating from damaging the equipment and extending its service life.

[0021] Using real-time temperature measurement and real-time weight loss measurement devices, combined with precision balances and infrared thermometers, this platform can accurately monitor the temperature and mass changes of samples in real time. This is crucial for accurately controlling the pyrolysis process and analyzing the properties of materials.

[0022] The stability of the experimental environment and the constant flow of inert gas are ensured by the sealed box design and the configuration of the gas path system, such as micro air pumps and rotor flowmeters. In addition, the use of flue gas analyzers and oxygen concentration meters further ensures the control of gas composition under experimental conditions.

[0023] Rapid heating and precise temperature control shorten the experimental cycle, improve the experimental throughput, and make the experiment more efficient; real-time and precise data monitoring makes the experimental results more reliable, and the accuracy of the data is significantly improved, which helps researchers better understand the thermophysical behavior and chemical changes of the fuel; the use of the water cooling system significantly reduces the maintenance cost caused by equipment overheating, while improving energy efficiency; the perfect environmental control and sealing design reduce the risk of leakage of hazardous gases and ensure the safety of experimental operations.

[0024] Additional aspects and advantages of embodiments according to the present invention will become apparent in the following description or may be learned through practice of embodiments according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 A perspective view of a sealing housing and a connection structure thereof according to the present invention;

[0028] Figure 3 It is a schematic diagram of the sealing housing structure of the present invention;

[0029] Figure 4 It is a schematic diagram of a half-section of the extension tube sleeve of the present invention and its connection structure;

[0030] Figure 5 It is a schematic diagram of the TG curve of biomass pyrolysis at different temperatures of the present invention;

[0031] Figure 6 It is a schematic diagram of the DTG curve of biomass pyrolysis at different temperatures of the present invention;

[0032] Figure 7 It is a schematic diagram of the TG curve of biomass pyrolysis at different heating rates of the present invention;

[0033] Figure 8 It is a schematic diagram of the DTG curve of biomass pyrolysis at different heating rates of the present invention;

[0034] Fig. 9 The figure is a flow chart of the method steps of the present invention.

[0035] in, Figure 1-Figure 9 The corresponding relationship between the reference numerals and the component names is as follows:

[0036] 1-sealed box, 2-laser heating device, 3-real-time temperature measuring device, 4-real-time weight loss measuring device, 5-gas system, 6-water cooling system, 7-gas detection device, 8-platform data acquisition terminal, 9-left air inlet, 10-right air inlet, 11-exhaust port, 12-left laser emitter mounting hole, 13-right laser emitter mounting hole, 14-data line collection port, 15-left laser emitter, 16-right laser emitter, 17-external semiconductor laser emission source, 1 8-infrared thermometer, 19-movable adjustable bracket, 20-precision balance, 21-insulation cotton, 22-material loading device, 23-air guide hose, 24-micro air pump, 25-rotor flowmeter, 26-water cooling pump, 27-water cooling plate, 28-circulating water tank, 29-oxygen concentration measuring instrument, 30-flue gas analyzer, 31-flue gas tar filter, 32-disassembly and assembly door, 33-semiconductor laser lens, 34-front plano-convex lens, 35-extension tube sleeve, 36-laser transmitter power supply. DETAILED DESCRIPTION

[0037] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0039] See also Figure 1-Figure 9 , a rapid thermogravimetric measurement platform and analysis method based on semiconductor laser heating according to some embodiments of the present invention are described below.

[0040] The first aspect of the present invention provides a fast thermogravimetric measurement platform based on semiconductor laser heating. In some embodiments of the present invention, Figure 1-Figure 8 As shown, the rapid thermogravimetric measurement platform comprises a sealed box 1, a laser heating device 2, a real-time temperature measuring device 3, a real-time weight loss measuring device 4, a gas circuit system 5, a water cooling system 6, a gas detection device 7 and a platform data acquisition terminal 8;

[0041] The outer wall of the sealed box 1 is respectively provided with a left air inlet 9, a right air inlet 10, an exhaust port 11, a left laser emitter 15 mounting hole 12 and a right laser emitter 16 mounting hole 13, and a data line collection port 14 is provided at the lower part of the sealed box 1;

[0042] The laser heating device 2 includes a left laser emitter 15 adapted to the left air inlet 9, a right laser emitter 16 adapted to the right air inlet 10, an external semiconductor laser emission source 17 and a laser emitter power supply 36; the external semiconductor laser emission source 17 is electrically connected to the laser emitter power supply 36, the left laser emitter 15 and the right laser emitter 16;

[0043] The real-time temperature measuring device 3 includes an infrared thermometer 18 located inside the sealed box 1 and a movable adjustable bracket 19 for mounting the infrared thermometer 18;

[0044] The real-time weight loss measuring device 4 includes a precision balance 20, a heat insulation cotton 21 and a material holding device 22 for carrying materials which are stacked in sequence;

[0045] The air path device includes an air guide hose 23, a micro air pump 24 and a rotor flow meter 25 adapted to the left air inlet 9, the right air inlet 10 and the exhaust port 11; the micro air pump 24 is connected to the air guide hose 23 through the rotor flow meter 25;

[0046] The water cooling system 6 includes a water cooling pump 26, a water cooling plate 27 and a circulating water tank 28; the water cooling pump 26 is used to drive cooling water to circulate between the water cooling plate 27 and the circulating water tank 28, and the water cooling plate 27 is fixedly assembled with the external semiconductor laser emission source 17;

[0047] The gas detection device 7 includes an oxygen concentration measuring instrument 29, a flue gas analyzer 30 and a flue gas tar filter 31; the flue gas analyzer 30 is connected to the micro air pump 24 through the flue gas tar filter 31, and the detection end of the oxygen concentration measuring instrument 29 is located inside the sealed box 1;

[0048] The platform data acquisition terminal 8 is connected to the precision balance 20 and the infrared thermometer 18 via a data line to obtain real-time measurement data of the precision balance 20 and the infrared thermometer 18, and control the measurement frequency of the precision balance 20 and the infrared thermometer 18; the platform data acquisition terminal 8 is also used to adjust the output power of the left laser emitter 15 and / or the right laser emitter 16 according to the real-time measurement data, and display the calorific value and weight loss rate of the analyzed material.

[0049] The invention provides a rapid thermogravimetric measurement platform based on semiconductor laser heating. The sealed box 1 provides a controlled environment for the sample to reduce external interference. It has multiple dedicated ports, such as a left air inlet 9, a right air inlet 10 and an exhaust port 11, as well as a hole for installing a laser emitter. The laser heating device 2 provides rapid and uniform heating to achieve rapid pyrolysis of biomass, including laser emitters on the left and right sides, which are powered by an external semiconductor laser source. The laser emitters are directly connected to a laser emitter power supply 36. The real-time temperature measurement device 3 monitors the temperature change of the sample to ensure the control of the heating process and the accuracy of the data. The infrared thermometer 18 located inside the sealed cavity is installed on a movable adjustable bracket 19 for easy adjustment and precise positioning. The real-time weight loss measurement device 4 measures the mass change of the sample during the heating process, which is key to understanding the thermal decomposition characteristics of the material, and includes a precision balance 20 and an insulator. The heat cotton 21 and the material holding device 22 for placing the sample; the gas path system 5 controls the gas flow during the combustion or pyrolysis of the sample, including a micro air pump 24, a rotor flowmeter 25 and a gas guide hose 23 connected to the air inlet and outlet 11; the water cooling system 6 keeps the system running at a safe temperature to prevent overheating, including a water cooling pump 26, a water cooling plate 27 and a circulating water tank 28 to ensure the cooling of the laser emission source and other key components; the gas detection device 7 analyzes the gas composition generated during the pyrolysis process, including an oxygen concentration measuring instrument 29, a flue gas analyzer 30 and a tar filter, which is directly connected to the micro air pump 24; the platform data acquisition terminal 8 collects and analyzes the data obtained from the infrared thermometer 18 and the precision balance 20, controls the output power of the laser transmitter, and displays the calorific value and weight loss rate of the material, including connecting with the real-time thermometer and the weight loss measuring device through a data line to realize real-time data collection and analysis.

[0050] When the sample is placed in the sealed cavity, the heating and measurement parameters are set through the platform data acquisition terminal 8. The laser heating device 2 quickly heats the sample according to the preset program. At the same time, the real-time temperature measurement equipment monitors the temperature change. The gas system 5 adjusts the intake and exhaust to maintain a suitable atmosphere. At the same time, the gas detection device 7 analyzes the gas composition produced by pyrolysis. The real-time weight loss measurement device 4 records the mass change of the sample during the pyrolysis process. All data are transmitted to the data acquisition terminal in real time. The output of the laser transmitter is adjusted according to the feedback to optimize the heating effect.

[0051] The invention has reasonable design, low cost, compact structure, safety and reliability, simple operation and convenient use. Compared with the traditional slow pyrolysis analyzer, the technical solution of the invention uses a semiconductor laser emission source as a heating device, which can realize rapid pyrolysis of fuel at different heating rates and different temperatures. The lowest heating rate of the device of the invention is 60 times that of the conventional thermogravimetric analyzer (the conventional thermogravimetric analyzer usually uses a heating rate of 10°C / min), and the highest heating rate is 900 times that of the conventional thermogravimetric analyzer; the invention is heated evenly, the material is heated completely and thoroughly, and continuous sample delivery detection can be realized, which effectively reduces the energy consumption in the pyrolysis process. Under the same charcoal yield conditions, the energy consumption can be reduced by about 1000 times (taking the slow pyrolysis of the retort furnace as an example), and at the same time greatly shortens the detection cycle; through the data acquisition terminal, real-time weight loss measurement and real-time online temperature measurement can be realized, the laser output power can be adjusted according to the online response of the feedback temperature, and the data weight loss rate can be visualized and analyzed, and the fuel heat release calculation can be completed. Taking all factors into consideration, the present invention uses semiconductor laser heating to perform rapid pyrolysis weight loss analysis on fuels. Compared with existing conventional thermogravimetric analyzers, it can achieve high-performance automated rapid thermogravimetric analysis, which is of great significance for analyzing fuel combustion and heat release characteristics, especially for providing accurate technical parameters for rapid pyrolysis utilization of biomass.

[0052] In any of the above embodiments, a disassembly door 32 is provided at the front end of the sealed box body 1, and the disassembly door 32 is connected to the main body of the sealed box body 1 through a metal hinge. A door handle is provided on the outer side of the disassembly door 32 away from the sealed box body 1, and a sealing rubber ring is provided close to the inner side of the sealed box body 1; the disassembly door 32 squeezes the sealing rubber ring through a quick clamping tool to seal the sealed box body 1.

[0053] In this embodiment, the disassembly door 32 allows the operator to quickly access the interior of the sealed box 1, which is convenient for loading and removing samples or conducting internal inspections; the disassembly door 32 is equipped with a sealing rubber ring to prevent heat and gas leakage when the door is closed, thereby ensuring the safety of the experiment and the accuracy of the data; the metal hinge connection ensures that the disassembly door 32 can maintain its stability and durability even under frequent use.

[0054] The disassembly door 32 is connected to the main body of the sealed box 1 through a metal hinge, providing stable support so that the door can be opened and closed smoothly; when the disassembly door 32 is closed, the quick clamping tool (a mechanical clamping device) will squeeze the sealing rubber ring. This clamping effect is triggered by the operation of the door handle, and the design of the door handle allows the user to easily perform this action; the sealing rubber ring is squeezed during the door closing process to form a tight sealing layer, effectively isolating the internal and external environments, preventing heat loss and gas exchange; the sealing rubber ring material is selected to be able to withstand high temperatures and potential chemical corrosion, ensuring good sealing performance after repeated use and harsh conditions.

[0055] In any of the above embodiments, the left air inlet 9 and the right air inlet 10 are located at the same level.

[0056] In this embodiment, the left and right air inlets 10 provide necessary gases (such as inert gases or reaction gases) into the sealed cavity to support thermal analysis or combustion experiments of samples; by arranging air inlets on both sides of the cavity, the uniform distribution of gas in the sealed cavity can be promoted to avoid problems of local oxidation or uneven heating; the air inlets allow precise control of the type and amount of gas entering the sealed cavity, which helps to maintain the desired reaction environment or protective atmosphere.

[0057] Designing the air inlet at the same level of the sealed chamber helps to achieve horizontal convection of the gas after entering the sealed chamber, thereby promoting uniform distribution of the gas in the entire sealed chamber. This design utilizes the principles of thermodynamics and fluid mechanics in the sealed chamber, so that the natural flow of hot air rising and cold air falling complements the artificially introduced airflow; a micro air pump 24 and a rotor flowmeter 25 are connected to the air inlet to control the flow and pressure of the gas to ensure the accuracy and continuity of the gas input. The air inlet system design has the ability to adjust the flow rate and pressure to meet different experimental requirements, from rapid pyrolysis to slow combustion, etc.; by precisely controlling the type and amount of gas at the two air inlets, the experimenter can adjust the atmosphere in the sealed chamber according to the specific needs of the experiment, such as adding inert gas to prevent oxidation reactions, or adjusting the gas combination to promote specific chemical reactions.

[0058] In any of the above embodiments, the mounting hole 12 of the left laser emitter 15 , the mounting hole 13 of the right laser emitter 16 and the material holding device 22 are arranged on the same horizontal line.

[0059] In this embodiment, by arranging the laser emitter and the material holding device 22 on the same horizontal line, it can be ensured that the material is uniformly irradiated with the laser, thereby avoiding sample analysis errors caused by uneven heating; this configuration helps to maximize the direct transfer of laser energy to the sample, reduce energy loss during the transfer process, and improve the overall heating efficiency; by simplifying the laser alignment and adjustment process, the system is made more stable and reliable, and the complexity of laser system debugging and maintenance is reduced.

[0060] The laser emitter is directly aligned with the sample in the material holding device 22 through the mounting hole. This alignment ensures that the laser can be injected and emitted in parallel to achieve uniform irradiation of the sample. When the left and right laser emitters 16 work at the same time, they form symmetrical heating areas on the sample in the material holding device 22, which helps to avoid local overheating or the generation of unheated areas. The arrangement of lasers on the same horizontal line helps to achieve a more uniform heat distribution, because the distance between the laser irradiation points is equal, so that the heat energy is more evenly diffused on the surface and inside of the sample. The platform monitors the heating process in real time through the data acquisition terminal and adjusts the output power of the laser emitter. Ensure that each laser emitter outputs accurately according to actual needs, and cooperate with the symmetrical physical layout to further improve the overall heating efficiency and repeatability of experimental results.

[0061] In any of the above embodiments, the exhaust port 11 is disposed directly above the material carrying device.

[0062] In this embodiment, the exhaust port 11 is located directly above the material carrying device, which can effectively collect and discharge the gases generated during the heating process, including water vapor, smoke and other possible volatile organic compounds; this design helps to maintain the pressure balance in the sealed cavity and prevent sealing problems or equipment damage caused by excessive internal pressure; quickly discharging the gas can reduce the residence time of the gas in the cavity, avoid cross-contamination caused by long-term contact between the gas and the sample or affect the accuracy of the analysis results.

[0063] Due to the rising characteristics of hot air, arranging the exhaust port 11 directly above the material carrier can utilize the thermodynamic principle, that is, the natural tendency of hot air and gas to move upward due to heating, thereby effectively guiding the gas to flow directly to the exhaust port 11; the equipment may include a mechanism to control the exhaust flow rate and pressure, such as a micro air pump 24 and a rotor flowmeter 25. These control devices can adjust the exhaust speed according to experimental requirements to ensure that the gas is discharged quickly and safely; the design of the exhaust system is integrated with other systems of the platform (such as gas input, temperature control, etc.), and is monitored and adjusted through a data acquisition terminal to achieve efficient and precise control. This integrated control helps to optimize experimental conditions and improve the reliability and repeatability of the experiment.

[0064] In any of the above embodiments, the data lines of the precision balance 20 and the infrared thermometer 18 are connected to the platform data acquisition terminal 8 through the data line collection port 14 .

[0065] In this embodiment, the data line hub 14 serves as a central node connecting various measuring devices (such as a precision balance 20 and an infrared thermometer 18) with a data acquisition terminal, and can centrally manage and transmit all important experimental data; directly connecting to the data acquisition terminal via a data line can achieve rapid transmission of real-time data, ensuring immediate processing and analysis of data; using a unified data line hub 14 can reduce the impact of external interference on data transmission and improve the quality and accuracy of data transmission.

[0066] The precision balance 20 and the infrared thermometer 18 are connected to the data line collection port 14 through their data lines, and the collection port is connected to the platform data acquisition terminal 8 through one or more data lines. This physical connection ensures the direct and safe transmission of data from the measuring device to the processing unit; the data acquisition terminal receives data from the precision balance 20 and the infrared thermometer 18, and can perform real-time data synchronization, processing and analysis. For example, the terminal can adjust the power of the laser heater according to the temperature data provided by the infrared thermometer 18, or calculate the weight loss rate of the material according to the balance data; the data acquisition terminal not only processes data, but also adjusts and optimizes the working parameters of the entire system according to the real-time data output, such as adjusting the gas flow rate, laser power, etc., thereby realizing a highly automated and precisely controlled experimental process.

[0067] In any of the above embodiments, the left laser emitter 15 and the right laser emitter 16 respectively include a semiconductor laser lens 33, a front plano-convex lens 34 and an extension tube sleeve 35. The front plano-convex lens 34 cooperates with the extension tube sleeve 35 to adjust the size and intensity of the laser spot emitted by the semiconductor laser lens 33 to the material.

[0068] In this embodiment, the front plano-convex lens 34 allows the size of the laser spot directed to the material to be adjusted; by adjusting the position and angle of the lens and the extension tube sleeve 35, the light intensity of the laser spot can be controlled to adapt to different materials and heating requirements; precise laser focusing helps to improve energy conversion efficiency, ensure that the laser energy is concentrated on the target area, and reduce energy waste.

[0069] The semiconductor laser lens 33 generates a laser beam, which first passes through the front plano-convex lens 34. This lens is designed to focus or diffuse the laser beam, and adjust the divergence or convergence of the beam according to its curvature and the distance from the laser lens; the extension tube sleeve 35 is used to fix and adjust the position of the lens, thereby changing the degree of influence of the lens on the laser beam. By adjusting the telescopic length of the sleeve, the position of the laser focus can be fine-tuned, thereby adjusting the size and intensity of the spot; by adjusting the relative position of the front lens and the extension tube sleeve 35, the distribution of the laser spot on the surface of the material can be accurately controlled, so that the laser heating is more uniform, or concentrated in a specific area to meet special heating needs; the data acquisition terminal can adjust the laser output according to real-time feedback, and the position of the lens and sleeve can also be dynamically adjusted as needed to optimize the heating process.

[0070] In any of the above embodiments, the extension tube sleeve 35 is provided with an internal thread for connecting the semiconductor laser lens 33 and the front plano-convex lens 34. The front plano-convex lens 34 is located at one end of the extension tube sleeve 35 away from the semiconductor laser lens 33 and is fixed by an external threaded clamp ring.

[0071] The distance between the front plano-convex lens 34 and the semiconductor laser lens 33 is 40 mm-60 mm;

[0072] The planar side of the front plano-convex lens 34 faces the material holding device 22 , and the convex side of the front plano-convex lens 34 faces the semiconductor laser lens 33 .

[0073] In this embodiment, the main function of the front plano-convex lens 34 is to focus or diffuse the laser emitted from the semiconductor laser lens 33 to adjust the size and intensity of the laser spot and achieve precise heating of the material; the distance between the lens and the laser lens is adjustable (40mm-60mm), which allows the operator to adjust the focal length as needed to optimize the characteristics of the laser spot; the design of the internal thread extension tube sleeve 35 and the external thread retaining ring ensures a firm connection between the lens and the laser lens to prevent loosening under high temperature or vibration conditions.

[0074] The laser generated by the semiconductor laser lens 33 first enters the front plano-convex lens 34 through the extension tube sleeve 35. Since the convex surface of the front plano-convex lens 34 faces the laser lens, the laser first encounters the convex surface, which can focus the laser beam. The flat side of the lens faces the material holding device 22, so that the focused laser beam is irradiated onto the sample with an appropriate spot size and energy density. By adjusting the distance between the front plano-convex lens 34 and the semiconductor laser lens 33, the focal position of the laser beam can be changed, thereby adjusting the size and shape of the spot. The external threaded retaining ring fixes the lens at the far end of the extension tube sleeve 35 to ensure that the lens remains stable under long-term use or high temperature conditions. The internal thread design allows the lens and retaining ring to be easily connected to the extension tube sleeve 35, while providing sufficient adjustment space to adapt to different experimental settings.

[0075] In any of the above embodiments, the infrared thermometer 18 is fixed by a slot provided on the movable adjustable bracket 19, and at least one temperature measuring spot of the infrared thermometer 18 is adjusted to be located on the material carrying device; the temperature measuring range of the infrared thermometer 18 is between -50°C and 1650°C.

[0076] The measured temperature obtained by the infrared thermometer is used to calibrate the measurement value of the precision balance when the material is heated.

[0077] In this embodiment, the infrared thermometer 18 is capable of measuring the surface temperature of the material in a wide temperature range (-50°C to 1650°C), which makes it suitable for various application scenarios from low temperature to extremely high temperature; by monitoring the temperature of the material in real time, the infrared thermometer 18 provides key data for the system to adjust the laser heating parameters or make other necessary adjustments; the infrared thermometer 18 is mounted on a movable adjustable bracket 19 and fixed by a slot set on the bracket. This design allows the user to adjust the position and angle of the infrared thermometer 18 as needed to ensure that at least one temperature measurement spot is accurately aligned with the sample on the material carrier.

[0078] The infrared thermometer 18 measures temperature by detecting infrared radiation emitted by an object. Each object emits infrared radiation of a specific wavelength according to its temperature, and the infrared thermometer 18 uses this principle to convert it into a temperature reading; the light spot of the thermometer is the area sensed by its infrared sensor, and the adjustment bracket can accurately locate the area covered by the light spot to ensure that the light spot covers the sample surface to be measured to obtain accurate temperature data; the set temperature range (-50℃ to 1650℃) allows use under different experimental conditions, including temperature measurement of very hot or relatively cold materials, which is very important for materials science and heat treatment research; the measured temperature data is transmitted through a data line connected to the data acquisition system, and the system analyzes and feedbacks based on real-time data to optimize the heating process and ensure the accuracy of the experiment.

[0079] Specifically, the infrared thermometer 18 has two temperature measuring spots, one is aimed at the area or upper surface of the material carrying device other than the material, and the other is aimed at the light-emitting port of the left laser emitter 15 or the right laser emitter 16, and obtains the first detection temperature of the material carrying device and the second detection temperature of the left laser emitter 15 or the right laser emitter 16. The second detection temperature is used to correct the first detection temperature, and the corrected first detection temperature is used to characterize the current temperature of the material.

[0080] From the above, it can be seen that one temperature measuring spot is aimed at the material area or upper surface of the material carrying device to provide temperature data of the material, which is called the first detection temperature, and another temperature measuring spot is aimed at the light-emitting port of the left laser emitter 15 or the right laser emitter 16 to obtain the temperature of the device itself, which is called the second detection temperature; the second detection temperature is used to correct the first detection temperature. This step can compensate for the potential measurement error caused by the heating of the device itself and improve the accuracy of the data; the corrected first detection temperature is used to accurately characterize the current temperature of the material.

[0081] The infrared thermometer 18 is able to monitor two different areas simultaneously through its built-in dual spot system. This design allows real-time temperature data about the material and the laser emitter to be obtained simultaneously; the second detected temperature (laser emitter temperature) provides information about the operating temperature of the equipment, which is used to correct the first detected temperature (material temperature). The correction algorithm may include subtracting the effect of the equipment heat from the material temperature, or adjusting the material temperature reading based on the change in equipment temperature; the card slot on the movable adjustment bracket 19 allows the infrared thermometer 18 spot to be accurately aimed at the target area. The user can adjust the position of each spot according to the experimental needs to ensure the most accurate temperature data; the corrected material temperature data is used to control the heating process (such as adjusting the laser power, modifying the heating time, etc.), ensuring that the experimental process runs according to the predetermined parameters, and helping users evaluate and optimize the thermal treatment or chemical reaction process of the material.

[0082] Furthermore, the measured temperature obtained by the infrared thermometer is used to calibrate the measurement value of the precision balance when the material is heated by the following formula:

[0083] Δm=-3.02×10 -7 T 2 +7.47×10 -3 T-0.064

[0084] Wherein, Δm is the difference between the mass after heating and the initial mass, in mg; T is the selected heating temperature, in °C;

[0085] When the emissivity R = 0.9, the calibration formula for the infrared thermometer to measure temperature is as follows:

[0086]

[0087] Where, T 真实 is the actual temperature, in °C; ΔT is the difference between the actual temperature and the infrared temperature measurement, in °C; T 红外 It is infrared temperature measurement, the unit is ℃.

[0088] In any of the above embodiments, the material holding device 22 includes a square sheet made of two layers of stainless steel wire mesh, the material is placed at the center of the upper surface of the square sheet, and the square sheet is plugged onto the heat insulation cotton 21 through steel wire;

[0089] Among them, the precision balance 20 has a range of 0g-120g, a graduation value of 0.1mg and an error of 0.06mg.

[0090] In this embodiment, the material holding device 22 is composed of a square sheet made of two layers of stainless steel wire mesh. This structure is stable and resistant to high temperatures, and can effectively support and fix the material placed thereon; the use of wire mesh can increase the contact area between the material and the heating source, promote more uniform heat transfer to the material, and avoid local overheating or non-heating; the square sheet is plugged into the insulation cotton 21 through steel wire, and the function of the insulation cotton 21 is to reduce the downward transfer of heat, protect the balance from the direct impact of high temperature, and maintain an environment for accurate measurement. The material holding device 22 achieves efficient thermal management and physical support through its structural design. The open structure of the wire mesh allows the laser to directly penetrate and evenly heat the material, while its combination with the insulation cotton 21 effectively prevents heat loss and protects the measuring equipment from high temperature.

[0091] The precision balance 20 has a range of 0g to 120g, a graduation value of 0.1mg, and an error of only 0.06mg, which enables the balance to perform very accurate mass measurements; during the material heating and pyrolysis process, the balance can monitor the mass change of the material in real time. The precision balance 20 monitors and records the mass loss of the material during the heating process in real time through its highly sensitive sensor system. This data can be directly transmitted to the data acquisition terminal for real-time analysis of the reaction dynamics of the material and calculation of the weight loss rate of the material.

[0092] In any of the above embodiments, the air hose 23 is assembled and connected using a pneumatic joint, the micro air pump 24 maintains the inside of the sealed box 1 at a positive pressure of 0.1KPa-0.2KPa, and the rotor flowmeter 25 monitors the flow change of the air hose 23;

[0093] The range of the rotor flowmeter 25 is 1 L / min-10 L / min, and the error is ±2.5%; the intake flow rate of the air hose 23 is 6 L / min, and the exhaust flow rate of the air hose 23 is 5 L / min.

[0094] In this embodiment, the air hose 23 is responsible for delivering gas from an external source or a micro air pump 24 to the inside of the sealed box 1, and is also responsible for exhausting the gas inside. A pneumatic joint is used for assembly to ensure the tightness and reliability of the connection; the micro air pump 24 maintains a positive pressure (0.1KPa to 0.2KPa) inside the sealed box 1, which helps prevent external gas contamination and ensure the stability of the experimental environment; the rotor flowmeter 25 is used to monitor the flow change of the air hose 23 to ensure the accuracy and continuity of the gas flow.

[0095] The micro air pump 24 delivers gas to the inside of the sealed box 1 through the air hose 23, and the gas flow rate is determined by the output capacity of the air pump. The intake flow rate is set to 6L / min, while the exhaust flow rate is set to 5L / min. This setting helps maintain a slight positive pressure in the box; maintaining a positive pressure of 0.1KPa to 0.2KPa helps prevent external air and pollutants from entering the sealed box 1 and protect the purity of the experimental environment. The micro air pump 24 adjusts its output to ensure that the pressure is stable within a preset range; the rotor flowmeter 25 is used to monitor the gas flow in real time, with a range of 1L / min to 10L / min and an error of ±2.5%. By monitoring the intake and exhaust flow rates, the flowmeter can help the operator adjust the output of the micro air pump 24 to ensure the accuracy of the gas flow rate and the constancy of the experimental conditions; the pneumatic connector is used to quickly and easily connect or disconnect the air hose 23 to ensure the sealing of the gas delivery path and the convenience of operation. This connector makes the assembly and maintenance process simpler and safer.

[0096] In any of the above embodiments, the fixed assembly of the external semiconductor laser emission source 17 and the water cooling plate 27 is coated with silver silicone grease to maintain the working temperature of the semiconductor laser emission source below 40°C;

[0097] The water inlet of the water cooling plate 27 is connected to the water cooling pump 26 , and the water cooling pump 26 is placed inside the circulating water tank 28 .

[0098] In this embodiment, silver silicone grease is used as a coating on the contact surface between the semiconductor laser emission source and the water-cooled plate 27 to improve the heat conduction efficiency and help maintain the laser emission source at a low temperature (below 40°C); the water-cooled plate 27 effectively absorbs the heat generated by the semiconductor laser emission source by contacting the semiconductor laser emission source, and then the heat is removed through the cooling water circulation; the water-cooled pump 26 drives the cooling water to flow between the water-cooled plate 27 and the circulating water tank 28, ensuring that there is a continuous flow of cooling water through the water-cooled plate 27 to remove the heat.

[0099] Silver silicone grease is used as a thermal interface material to reduce the thermal contact impedance between the semiconductor laser emission source and the water-cooled plate 27. The high thermal conductivity of silver silicone grease can accelerate the transfer of heat from the laser emission source to the water-cooled plate 27, thereby reducing the operating temperature of the emission source; there are usually a series of water channels inside the water-cooled plate 27, and the cooling water takes away the heat when flowing through these water channels. The design of the water-cooled plate 27 enables it to effectively absorb and dissipate the heat generated by the laser emission source; the water-cooled pump 26 is located inside the circulating water tank 28 and is responsible for driving the cooling water to circulate in the system. The function of the pump is to ensure sufficient water flow speed and pressure to continuously remove heat from the water-cooled plate 27 and transport hot water to the circulating water tank 28 for cooling; the circulating water tank 28 not only stores cooling water, but also helps the cooling water dissipate heat through the radiator or other cooling device that may be included in its design. The cooled water is pumped back to the water-cooled plate 27 again to continue to absorb the heat from the laser emission source.

[0100] By the attached Figure 5 and attached Figure 6 It can be seen that the function can meet the needs of rapid thermogravimetric analysis of biomass, and can realize multiple functions such as fuel TG, DTG analysis and fuel heat release calculation. The TG curve shows that the biomass has the largest volatilization analysis ratio between 3s-4s (pyrolysis temperature between 300℃-400℃) at this heating rate, and the DTG curve shows that the biomass has the fastest weight loss rate at 4s (pyrolysis temperature around 400℃).

[0101] By the attached Figure 7 and attached Figure 8 It can be seen that the function can meet the needs of rapid thermogravimetric analysis of biomass, and can realize multiple functions such as fuel TG, DTG analysis and fuel heat release calculation. The TG curve shows that the fixed output of biomass is basically the same at the same final pyrolysis temperature. The DTG curve shows that under different heating rate conditions (heating rate 10℃ / s, 50℃ / s, 100℃ / s), the corresponding pyrolysis time reaches the maximum weight loss rate at 40s, 8s, and 4s, respectively, and the corresponding pyrolysis temperature is 400℃.

[0102] The embodiment of the second aspect of the present invention provides an analytical method. In some embodiments of the present invention, such as Fig. 9 As shown, the analysis method includes the following steps:

[0103] S101, load the material on the material holding device 22, and insert the material holding device 22 on the heat insulating cotton 21 on the precision balance 20 to measure the mass of the material before pyrolysis; adjust the position of the material holding device 22 so that the laser spot is irradiated on the material and the material holding device 22.

[0104] S102, close the sealed box 1 and turn on the real-time weight loss measuring device 4 and the real-time temperature measuring device 3. Inert gas is introduced from the left air inlet 9 and the right air inlet 10, and the air intake flow rate is maintained at 6L / min and the exhaust flow rate is 5L / min. The exhaust port 11 is connected to the flue gas analyzer 30 through the flue gas tar filter 31 to monitor the oxygen concentration.

[0105] S103, when the oxygen concentration drops below 1%, start the laser heating device 2, and control the laser power of the laser heating device 2 through the platform data acquisition terminal 8 to adjust the pyrolysis temperature to 500°C and the pyrolysis rate to one of 10°C / s, 50°C / s and 100°C / s.

[0106] S104, obtaining real-time measurement data of the precision balance 20 and the infrared thermometer 18, until the end.

[0107] The present invention provides an analysis method. In step S101, by using heat insulation cotton 21 and material holding device 22 on precision balance 20 to perform preliminary mass measurement, high-precision monitoring of mass changes of materials can be ensured. In step S102, the use of sealed box 1 and the flow of inert gas controlled by air inlet and exhaust port 11 ensure the stability and repeatability of the experimental environment. Maintaining specific air intake and exhaust flow rates, as well as monitoring oxygen concentration through flue gas tar filter 31, ensures the inertness of the reaction environment, reduces the interference of oxidation reaction, and thus improves the accuracy of experimental data. In step S103, by accurately controlling laser power and pyrolysis rate (such as 10℃ / s, 50℃ / s and 100℃ / s), the pyrolysis temperature can be flexibly adjusted to 500℃ to meet different experimental requirements. This fine temperature control capability is achieved through the platform data acquisition terminal 8, which integrates real-time data processing functions to ensure the accuracy and response speed of laser heating. In step S104, real-time data from the precision balance 20 and infrared thermometer 18 are continuously obtained, allowing researchers to monitor mass changes and temperature changes throughout the pyrolysis process. This not only helps to adjust experimental parameters in real time, but also provides a rich information basis for subsequent data analysis and result evaluation.

[0108] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0109] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A rapid thermogravimetric measurement platform based on semiconductor laser heating, characterized in that: It includes a sealed box, a laser heating device, a real-time temperature measuring device, a real-time weight loss measuring device, a gas circuit system, a water cooling system, a gas detection device and a platform data acquisition terminal; The outer wall of the sealed box is respectively provided with a left air inlet, a right air inlet, an exhaust port, a left laser transmitter mounting hole and a right laser transmitter mounting hole, and the lower part of the sealed box is provided with a data line collection port; The laser heating device comprises a left laser emitter adapted to the left air inlet, a right laser emitter adapted to the right air inlet, an external semiconductor laser emission source and a laser emitter power supply; the external semiconductor laser emission source is electrically connected to the laser emitter power supply, the left laser emitter and the right laser emitter; The real-time temperature measurement device includes an infrared thermometer located inside the sealed box and a movable adjustable bracket for mounting the infrared thermometer; The real-time weight loss measuring device comprises a precision balance, heat insulation cotton and a material holding device for carrying materials stacked in sequence; The air path system includes an air guide hose, a micro air pump and a rotor flow meter adapted to the left air inlet, the right air inlet and the exhaust port; the micro air pump is connected to the air guide hose through the rotor flow meter; The water cooling system includes a water cooling pump, a water cooling plate and a circulating water tank; the water cooling pump is used to drive cooling water to circulate between the water cooling plate and the circulating water tank, and the water cooling plate is fixedly assembled with the external semiconductor laser emission source; The gas detection device comprises an oxygen concentration measuring instrument, a flue gas analyzer and a flue gas tar filter; the flue gas analyzer is connected to the micro air pump through the flue gas tar filter, and the detection end of the oxygen concentration measuring instrument is located inside the sealed box; The platform data acquisition terminal is connected to the precision balance and the infrared thermometer via a data line to obtain real-time measurement data of the precision balance and the infrared thermometer, and control the measurement frequency of the precision balance and the infrared thermometer; the platform data acquisition terminal is also used to adjust the output power of the left laser emitter and / or the right laser emitter according to the real-time measurement data, and display and analyze the calorific value and weight loss rate of the material; The left air inlet and the right air inlet are located at the same horizontal height; and / or the left laser emitter mounting hole, the right laser emitter mounting hole and the material holding device are arranged on the same horizontal line; and / or the exhaust port is arranged directly above the material holding device; and / or the data cables of the precision balance and the infrared thermometer are connected to the platform data acquisition terminal through the data cable collection port; The left laser emitter and the right laser emitter respectively include a semiconductor laser lens, a front plano-convex lens and an extension tube sleeve. The front plano-convex lens cooperates with the extension tube sleeve to adjust the size and intensity of the laser spot emitted by the semiconductor laser lens to the material.

2. The rapid thermogravimetric measurement platform according to claim 1, characterized in that: A disassembly door is provided at the front end of the sealed box body, and the disassembly door is connected to the sealed box body main body through a metal hinge. A door handle is provided on the outer side of the disassembly door away from the sealed box body, and a sealing rubber ring is provided close to the inner side of the sealed box body; the disassembly door squeezes the sealing rubber ring through a quick clamping tool to seal the sealed box body.

3. The rapid thermogravimetric measurement platform according to claim 1, characterized in that: The extension tube sleeve is provided with an internal thread for connecting the semiconductor laser lens and the front plano-convex lens. The front plano-convex lens is located at one end of the extension tube sleeve away from the semiconductor laser lens and is fixed by an external thread clamping ring. The distance between the front plano-convex lens and the semiconductor laser lens is 40mm-60mm; The plane side of the front plano-convex lens faces the material holding device, and the convex side of the front plano-convex lens faces the semiconductor laser lens.

4. The rapid thermogravimetric measurement platform according to claim 1, characterized in that: The infrared thermometer is fixed by a slot provided on the movable adjustable bracket, and at least one temperature measuring spot of the infrared thermometer is adjusted to be located on the material holding device; the temperature measuring range of the infrared thermometer is between -50°C and 1650°C; The measured temperature obtained by the infrared thermometer is used to calibrate the measurement value of the precision balance when the material is heated.

5. The rapid thermogravimetric measurement platform according to claim 1, characterized in that: The material holding device comprises a square sheet made of two layers of stainless steel wire mesh, the material is placed at the center of the upper surface of the square sheet, and the square sheet is plugged onto the heat insulation cotton through steel wire; The precision balance has a measuring range of 0g-120g, a graduation value of 0.1 mg and an error of 0.06 mg.

6. The rapid thermogravimetric measurement platform according to claim 1, characterized in that: The air guide hose is assembled and connected by a pneumatic joint, the micro air pump maintains the inside of the sealed box at a positive pressure of 0.1 KPa-0.2 KPa, and the rotor flowmeter monitors the flow change of the air guide hose; The range of the rotor flowmeter is 1 L / min-10 L / min; the air intake flow rate of the air hose is 6 L / min, and the air exhaust flow rate of the air hose is 5 L / min.

7. The rapid thermogravimetric measurement platform according to claim 1, characterized in that: Silver silicone grease is applied to the fixed assembly of the external semiconductor laser emission source and the water cooling plate to maintain the operating temperature of the semiconductor laser emission source below 40°C; The water inlet of the water cooling plate is connected to the water cooling pump, and the water cooling pump is placed inside the circulating water tank.

8. An analysis method implemented by the rapid thermogravimetric measurement platform according to any one of claims 1 to 7, characterized in that: The steps include: S101, loading the material on the material holding device, inserting the material holding device on the heat-insulating cotton on the precision balance to measure the mass of the material before pyrolysis; adjusting the position of the material holding device so that the laser spot is irradiated on the material and the material holding device; S102, close the sealed box and open the real-time weight loss measuring device and the real-time temperature measuring device, introduce inert gas from the left air inlet and the right air inlet, and maintain the air intake flow rate at 6L / min and the exhaust flow rate at 5L / min, and connect the exhaust port to a flue gas analyzer through a flue gas tar filter to monitor the oxygen concentration; S103, when the oxygen concentration drops below 1%, start the laser heating device, and control the laser power of the laser heating device through the platform data acquisition terminal so as to adjust the pyrolysis temperature to 500°C and the pyrolysis rate to one of 10°C / s, 50°C / s and 100°C / s; S104, obtaining real-time measurement data of the precision balance and the infrared thermometer, until the end.

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