Cotton smoldering simulation and multi-modal gas detection device

Abstract

The utility model relates to cotton smoldering simulation and multimode gas detection device belongs to cotton smoldering detection technical field. This cotton smoldering simulation and multimode gas detection device includes air intake system, smoldering simulation cavity, multimode detection system, and smoldering simulation cavity includes box, support frame, pressing plate, load block, support frame is installed in the box, and the support frame is formed frame structure by multiple grid plates, and the inside of support frame forms the cylindrical accommodating cavity along the vertical direction, and the top of support frame is equipped with the opening that communicates with accommodating cavity, pressing plate is slidably installed in the accommodating cavity, and a plurality of air holes are seted up in the pressing plate, load block is placed on the pressing plate, air intake system is linked with the bottom of box, and the top of box is equipped with the exhaust port, and multimode detection system is installed in the box. The environment in the box of this cotton smoldering simulation and multimode gas detection device is relatively consistent, and the stability is higher, reduces the difference between different experimental groups, makes the detection data more comparable.

Description

Technical Field

[0001] This utility model belongs to the field of cotton smoldering detection technology, and specifically relates to a cotton smoldering simulation and multimodal gas detection device. Background Technology

[0002] Cotton is a natural fiber material with a highly porous structure, strong hygroscopicity, and complex cellulose composition. During storage and transportation, cotton bales are usually compacted into a high-density state, creating various smoldering initiation factors such as temperature accumulation, uneven humidity, fiber friction, and mechanical impact, which can easily develop into open flames. Smoldering in cotton is slow-burning, long-lasting, and highly concealed, posing a significant threat to storage safety. Therefore, conducting laboratory simulations and early detection studies of cotton smoldering processes is of great importance.

[0003] Existing combustion experimental devices and gas detection devices are difficult to stably and repeatedly simulate the smoldering process of cotton under different conditions, resulting in poor comparability of detection data obtained under different experimental conditions. Utility Model Content

[0004] This invention provides a cotton smoldering simulation and multimodal gas detection device to solve the technical problem that current combustion experimental devices and gas detection devices are unable to stably and repeatedly simulate the cotton smoldering process under different conditions.

[0005] This utility model is achieved through the following technical solution: a cotton smoldering simulation and multimodal gas detection device, comprising a smoldering simulation chamber including a housing, a support frame, a pressure plate, and a load block; the support frame is installed inside the housing, the support frame is composed of a frame structure of multiple grid plates, the support frame has a vertically oriented cylindrical receiving cavity inside, and the top of the support frame has an opening communicating with the receiving cavity; the pressure plate is slidably installed in the receiving cavity, and the pressure plate has multiple ventilation holes; the load block is placed on the pressure plate; the air intake system is connected to the bottom of the housing, the top of the housing has an exhaust port, and the multimodal detection system is installed in the housing.

[0006] Optionally, it also includes a release mechanism and a guide rod. The release mechanism is installed inside the housing and located above the support frame. One end of the guide rod is connected to the release mechanism, and the other end extends toward the support frame. The load block is slidably installed on the guide rod, and the release mechanism is used to drive the load block to slide along the guide rod.

[0007] Optionally, it also includes a heating plate and an igniter, wherein the heating plate is installed at the bottom of the support frame to continuously heat the cotton inside the support frame; the igniter is installed inside the box and extends toward the support frame.

[0008] Optionally, the multimodal detection system includes multiple gas sensing elements and a TDLAS gas detection module. The multiple gas sensing elements are installed inside the housing and located on one side of the support frame. Each gas sensing element is used to detect different gas concentrations. The TDLAS gas detection module is installed on the support frame and is used to scan the absorption lines of gas molecules to measure the gas concentration.

[0009] Optionally, the TDLAS gas detection module includes a laser emitter and a laser receiver. Optical windows are provided on opposite side walls of the housing. The laser emitter is installed in the optical window on one side wall of the housing, and the laser receiver is installed in the optical window on the other side wall of the housing. Both the laser emitter and the laser receiver are located outside the housing.

[0010] Optionally, the laser emitting end sends laser light to the laser receiving end to form a laser optical path, and the projection area of ​​the guide rod on the horizontal plane does not overlap with the projection area of ​​the laser optical path on the horizontal plane.

[0011] Optionally, the air intake system includes an air source, an air intake pipe, a valve, and a humidification structure. One end of the air intake pipe is connected to the air source, and the other end extends into the housing and is located at the bottom of the support frame. The valve is installed on the air intake pipe to regulate the gas flow rate of the air intake pipe. The humidification structure is installed on the air intake pipe and is used to humidify the gas in the air intake pipe.

[0012] Optionally, it also includes a flow equalization plate, which is installed inside the housing, the support frame is installed on the flow equalization plate, the air intake pipe extends to the side of the flow equalization plate away from the support frame, and a plurality of air holes are evenly distributed on the flow equalization plate.

[0013] Optionally, it also includes multiple thermocouples, which are inserted into the support frame to obtain the temperature of the cotton inside the support frame.

[0014] Optionally, it also includes an exhaust gas collection system, which is connected to the housing through the exhaust port.

[0015] Compared with the prior art, this utility model has the following advantages: The cotton smoldering simulation and multimodal gas detection device provided by this utility model includes an air intake system, a smoldering simulation chamber, and a multimodal detection system. The smoldering simulation chamber includes a box body, a support frame, a pressure plate, and a load block. The support frame is installed inside the box body and is composed of a frame structure made of multiple grid plates. The support frame has a cylindrical receiving cavity formed in the vertical direction, and the top of the support frame has an opening communicating with the receiving cavity. The pressure plate is slidably installed in the receiving cavity and has multiple ventilation holes. The load block is placed on the pressure plate. The air intake system is connected to the bottom of the box body, and the top of the box body has an exhaust port. The multimodal detection system is installed in the box body.

[0016] With the above structure, the cotton smoldering simulation and multimodal gas detection device of this utility model rigidly fixes the support frame in the box, and the position of the top opening and the grid-like side wall of the support frame does not move with the cotton compaction; when the load block changes the cotton compaction density, only the vertical thickness of the cotton in the cavity changes, and the position of the support frame body and the multimodal detection system relative to the box remains unchanged. The air intake system makes the environment in the box relatively uniform, with higher stability, reducing the differences between different experimental groups and making the detection data more comparable. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the cotton smoldering simulation and multimodal gas detection device provided by this utility model; Figure 2 This is a schematic diagram of the installation structure of the TDLAS gas detection module and the release mechanism in an embodiment of this utility model; Figure 3 This is a schematic diagram of the composition of the cotton smoldering simulation and multimodal gas detection device of this utility model.

[0019] In the picture: 1-Intake system, 11-Gas source, 12-Intake pipeline, 13-Valve, 14-Humidification structure, 2-Release mechanism, 3-Guide rod, 4-Heating plate, 5-Ignition device, 6-Flow equalization plate, 7-Thermocouple, 8-Exhaust gas collection system, 9-Smoldering simulation chamber, 91-Box, 92-Support frame, 93-Pressure plate, 94-Load block, 95-Optical window, 96-Transparent observation window, 101-Gas sensing element, 102-TDLAS gas detection module, 1021-Laser emitter, 1022-Laser receiver. Detailed Implementation

[0020] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] This invention provides a cotton smoldering simulation and multimodal gas detection device, solving the technical problem that current combustion experimental devices and gas detection devices are unable to stably and repeatedly simulate the cotton smoldering process under different conditions. The cotton smoldering simulation and multimodal gas detection device includes an air intake system 1, a smoldering simulation chamber 9, and a multimodal detection system. Reference Figures 1-2As shown, the smoldering simulation chamber 9 includes a housing 91, a support frame 92, a pressure plate 93, and a load block 94. The housing 91 provides space for smoldering simulation of cotton and gas detection. The housing 91 has a relatively stable and controllable environment to prevent excessive influence from the external environment during multiple simulations and measurements. The support frame 92 is installed inside the housing 91 and is used to place the cotton for smoldering simulation. The support frame 92 is composed of multiple grid plates to form a frame structure. The housing 91 and the grid that makes up the support frame 92 are made of stainless steel to reduce damage to the housing 91 and support frame 92 when the cotton is smoldering. In one embodiment provided in this example, the support frame 92 has a cylindrical receiving cavity formed in the vertical direction. The top of the support frame 92 has an opening that communicates with the receiving cavity. That is, the support frame 92 is a columnar structure composed of side walls and a bottom wall. Both the bottom wall and the side walls are grid structures, which allows the support to communicate with the inside and outside, and allows airflow to pass freely inside and outside the support. The cotton for smoldering simulation is placed in the receiving cavity.

[0025] Reference Figure 1 As shown, the pressure plate 93 is slidably installed in the receiving cavity. The pressure plate 93 is located above the cotton in the receiving cavity to make the pressure applied to the cotton more even. The pressure plate 93 is provided with multiple vent holes so that gas can be discharged through the vent holes when the pressure plate 93 applies pressure to the cotton.

[0026] Reference Figure 1 As shown, load blocks 94 are placed on pressure plate 93. Load blocks 94 are used to apply pressure to pressure plate 93, and thus apply pressure to cotton. The number, type, shape, size, weight, etc. of load blocks 94 can be adjusted according to the usage requirements. The load blocks 94 used in the simulation experiment can be the same or different. By stacking different load blocks 94 on pressure plate 93, the pressure on cotton can be adjusted, thereby changing the compaction density of cotton, so as to obtain relevant data on smoldering of cotton under different cotton densities.

[0027] Reference Figure 1 , Figure 3 As shown, the air intake system 1 is connected to the bottom of the housing 91. The air intake system 1 is used to vent air into the housing 91 in order to regulate the environment inside the housing 91. The top of the housing 91 is provided with an exhaust port to discharge the air inside the housing 91 so as to keep the pressure inside the housing 91 relatively stable. A multimodal detection system is installed on the housing 91 to detect the gas state inside the housing 91.

[0028] An optional implementation of this embodiment is as follows: To facilitate the adjustment and placement of the load block 94, the cotton smoldering simulation and multimodal gas detection device further includes a release mechanism 2 and a guide rod 3, as shown in the reference... Figures 1-2As shown, the release mechanism 2 is installed inside the housing 91 and located above the support frame 92. One end of the guide rod 3 is connected to the release mechanism 2, and the other end extends towards the support frame 92. The load block 94 is slidably mounted on the guide rod 3. The guide rod 3 guides the load block 94, causing it to slide along the guide rod 3, reducing the risk of the load block 94 deflecting and falling outside the support frame 92. The guide rod 3 can be multiple or prismatic. The load block 94 has holes that fit the guide rod 3, thereby reducing the rotation of the load block 94. The release mechanism 2 drives the load block 94 to slide along the guide rod 3. In use, the load block 94 can be lifted to a predetermined height and then released through the release mechanism 2. The cotton is subjected to mechanical impact. In this embodiment, the electromagnetic release mechanism 2 is an electromagnet, and the top of the load block 94 is provided with an armature or the load block 94 is an armature. When the electromagnet is energized, the electromagnet attracts the armature, thereby lifting the load block 94 to a predetermined height. When the electromagnet is de-energized, the electromagnet releases the armature, thereby causing the load block 94 to fall along the guide rod 3 under the action of gravity. The load block 94 is subjected to mechanical impact on the cotton below the pressure plate 93, making the cotton more compact. At the same time, the mechanical impact can also simulate the process of smoldering caused by mechanical friction and impact during the storage and handling of cotton due to falling or collision. By adjusting the height at which the electromagnet holds the load block 94, its falling height can be changed, thereby adjusting the impact energy.

[0029] An optional implementation of this embodiment is as follows: To better simulate smoldering cotton, the cotton smoldering simulation and multimodal gas detection device further includes a heating plate 4 and an igniter 5, as described above. Figures 1-2 As shown, the heating plate 4 is installed at the bottom of the support frame 92 to continuously heat the cotton inside the support frame 92, simulating the smoldering process induced by heat accumulation. The igniter 5 is installed inside the box 91 and extends towards the support frame 92. Specifically, the igniter 5 is a spark igniter 5, with the discharge end of the igniter 5 facing the cotton to simulate the smoldering process induced by an external spark. The heating time of the heating plate 4 and the ignition time of the igniter 5 are adjusted according to the usage requirements. The heating plate 4, the igniter 5, and the electromagnetic release mechanism 2 respectively induce the three smoldering induction methods of heat accumulation, electric spark, and mechanical impact within the box 91, so as to obtain data of different induction methods in a unified experimental environment, making the experiment more convenient.

[0030] An optional implementation of this embodiment is as follows: Refer to... Figures 1-3As shown, the multimodal detection system includes gas sensing elements 101 and TDLAS gas detection module 102. Multiple gas sensing elements 101 are provided, each detecting different gases (such as CO, CO2, volatile organic compounds, etc.) to obtain the concentration of different gases. The TDLAS gas detection module 102 is mounted on the support frame 92 and is used to scan the absorption lines of gas molecules to measure gas concentration. By simultaneously collecting the same gas sample within the chamber 91 through the gas sensing elements 101 and the TDLAS gas detection module 102, a multimodal detection system that complements qualitative and quantitative methods is formed. This eliminates errors introduced by inconsistent sampling positions and times during separate detection, improves the reliability of identifying characteristic gases in the early stages of smoldering, and thus makes the obtained gas concentration data more accurate.

[0031] An optional implementation of this embodiment is as follows: Refer to... Figures 1-3 As shown, the TDLAS gas detection module 102 includes a laser emitter 1021 and a laser receiver 1022. Optical windows 95 are provided on opposite side walls of the housing 91. The laser emitter 1021 is installed in the optical window 95 on the side wall of one housing 91, and the laser receiver 1022 is installed in the optical window 95 on the side wall of the other housing 91. Both the laser emitter 1021 and the laser receiver 1022 are located outside the housing 91. The TDLAS gas detection module 102 utilizes the selective absorption of specific wavelength laser light by gas molecules to achieve quantitative detection of the concentration of characteristic gases such as CO and CO2. 2. Installed outside the housing 91, it only comes into optical contact with the gas inside the cavity through the optical window 95, avoiding direct exposure of the TDLAS gas detection module 102 to the high-temperature environment generated by the smoldering of cotton, thus extending the service life of the TDLAS gas detection module 102; the optical window 95 is made of CaF2 material, so that the vibration band of gas molecules can be measured through the optical window 95, thereby qualitatively and quantitatively analyzing the composition of gas molecules inside the housing 91. Optionally, the smoldering simulation cavity 9 also includes a transparent observation window 96 set on the side wall of the housing 91, which facilitates direct observation of the smoldering situation inside the housing 91. The transparent observation window 96 is made of high-temperature borosilicate glass.

[0032] An optional implementation of this embodiment is as follows: Refer to... Figures 1-2As shown, the laser emitter 1021 sends laser light to the laser receiver 1022 to form a laser optical path. The projection area of ​​the guide rod 3 on the horizontal plane does not overlap with the projection area of ​​the laser optical path on the horizontal plane. This reduces the obstruction of the laser optical path by the guide rod 3, thereby enabling the TDLAS gas detection module 102 to better detect the gas. More preferably, the moving area of ​​the load block 94 does not pass through the laser optical path, so that the gas concentration can be detected even during the impact of the load block 94. This reduces the interference of the load impact on the TDLAS gas detection module 102, allowing the two to work simultaneously.

[0033] An optional implementation of this embodiment is as follows: Refer to... Figure 1 , Figure 3 As shown, the air intake system 1 includes an air source 11, an air intake pipe 12, a valve 13, and a humidification structure 14. One end of the air intake pipe 12 is connected to the air source 11, and the other end extends into the housing 91 and is located at the bottom of the support frame 92. The air source 11 is equipped with a valve 13 to regulate the gas flow rate of the air intake pipe 12 to simulate the smoldering environment of cotton under different ventilation conditions. Optionally, the humidification structure 14 is installed in the air intake pipe 12. The humidification structure 14 is used to humidify the gas in the air intake pipe 12. Specifically, the humidification structure 14 includes a humidifier, a gas washing bottle, and a humidity sensor. The gas washing bottles are connected in series on the inlet pipe 12 to regulate the humidity of the gas entering the chamber 91. A humidity sensor is installed on the inlet pipe 12 near the inlet of the chamber 91 to monitor the inlet humidity in real time, ensuring that the experimental humidity conditions are controllable and repeatable. The accompanying drawings of the instruction manual show schematic diagrams of components such as the gas source 11 and valve 13. It should be noted that the gas source 11 and valve 13 are all conventional equipment already existing in the field. Their selection, installation and control methods are all mature existing technologies, and their specific structures are not the core improvement of this utility model. Therefore, their internal detailed structures are not shown or described in detail.

[0034] An optional implementation of this embodiment is as follows: Refer to... Figure 1 As shown, in order to make the gas move more evenly within the housing 91, the cotton smoldering simulation and multimodal gas detection device also includes a flow equalization plate 6. The flow equalization plate 6 is installed inside the housing 91, and the support frame 92 is installed on the flow equalization plate 6. The air inlet pipe 12 extends to the side of the flow equalization plate 6 away from the support frame 92. Multiple air holes are evenly distributed on the flow equalization plate 6 to make the airflow entering the housing 91 more evenly transported upward, avoiding local airflow concentration from interfering with the smoldering process and detection results.

[0035] An optional implementation of this embodiment is as follows: Refer to... Figure 1As shown, in order to facilitate the determination of the cotton temperature inside the support frame 92, the cotton smoldering simulation and multimodal gas detection device also includes multiple thermocouples 7. The multiple thermocouples 7 are inserted into the cotton inside the support frame 92. The multiple thermocouples 7 are inserted into different positions inside the cotton to monitor the temperature distribution inside the cotton and to determine the occurrence and development of smoldering.

[0036] An optional implementation of this embodiment is as follows: Refer to... Figure 1 , Figure 3 As shown, to reduce the accumulation of harmful gases, the cotton smoldering simulation and multimodal gas detection device also includes an exhaust gas collection system 8. The exhaust gas collection system 8 is connected to the housing 91 through an exhaust port. The exhaust gas collection system 8 is used to discharge the gas inside the housing 91 into the experimental environment, reducing the distance of harmful gases. Specifically, the exhaust gas collection system 8 includes an exhaust pipe, a diversion pipe, a sampling bottle, and a vacuum pump. The exhaust pipe is connected to the exhaust port of the sensor housing 91. The diversion pipe divides the discharged gas into two paths. One path is connected to the sampling bottle to sample and preserve the smoldering characteristic gas for subsequent offline analysis. The other path is connected to the vacuum pump to discharge the exhaust gas into the experimental environment through the ventilation pipe, preventing the accumulation of harmful gases. More preferably, the gas extracted by the vacuum pump is treated before being discharged to reduce environmental pollution. The exhaust port can be opened or closed according to usage requirements.

[0037] It should be noted that the release mechanism 2, heating plate 4, igniter 5, gas sensing element 101, TDLAS gas detection module 102, and other components are electrically connected to the controller through their respective signal transmission lines. The controller is used to receive and process the sensing signals collected by each component and the detection data output by each detection module, and sends corresponding control commands to the required components according to the processing results, thereby completing the control of the release mechanism 2, heating plate 4, igniter 5, gas sensing element 101, TDLAS gas detection module 102, and other components, realizing real-time monitoring and adjustment of the detection operation status. The controller described in this embodiment is a conventional commercially available controller, and the basic functions such as signal acquisition, data processing, and command issuance are all existing technologies. Those skilled in the art can realize the above control functions without creative effort based on the description in this specification and common knowledge in the field. Therefore, this specification does not elaborate on the specific circuit structure and control program of the controller and related components.

[0038] With the above structure, the cotton smoldering simulation and multimodal gas detection device of this utility model is used as follows: First, the cotton to be simulated for smoldering is placed in the support frame 92, then the pressure plate 93 is placed, and the compaction density of the cotton is changed by the load block 94. Then, according to the usage requirements, the air intake system 1 introduces gas into the box 91. The gas is transported upward after passing through the flow equalization plate 6, so that the environment inside the box 91 is close to the desired state. Then, according to the usage requirements, one or more of the following methods are selected: heating plate 4, igniter 5, and release mechanism 2 to release the load block 94 to induce smoldering in the cotton. The same gas sample inside the box 91 is collected synchronously by the gas sensing element 101 and the TDLAS gas detection module 102, forming a multimodal detection system that complements qualitative and quantitative methods. This eliminates the error introduced by the inconsistency of sampling position and time when the detection is performed separately, and improves the reliability of early smoldering characteristic gas identification. Finally, according to the requirements, the exhaust gas collection system 8 is used to collect the gas inside the box 91.

[0039] By rigidly fixing the support frame 92 within the housing 91, the top opening and the position of the grid-like sidewalls of the support frame 92 do not move with the cotton compaction. When the load block 94 changes the cotton compaction density, only the vertical thickness of the cotton within the cavity changes; the positions of the support frame 92 and the multimodal detection system relative to the housing 91 remain unchanged. The TDLAS gas detection module 102 consists of laser emitters 1021 on the outer side walls of the housing 91 and receivers facing each other. Its optical path is equal to the sum of the distance between the windows on the two side walls and the distance to the internal gas pool, and it is fixed by the structure of the housing 91, independent of the cotton compaction density. The gas sensing element 101 is located in a fixed position on one side of the support frame 92. Therefore, when the compaction density, the studied variable, is changed, the detection geometry between the cotton sample and the multimodal detection system remains constant. This ensures that only the density variable differs between different compaction density experimental groups, while other detection conditions remain consistent, making the detection data more comparable.

[0040] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope described in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A cotton smoldering simulation and multimodal gas detection device, comprising an air intake system, a smoldering simulation chamber, and a multimodal detection system, characterized in that: The smoldering simulation chamber includes a box, a support frame, a pressure plate, and a load block; The support frame is installed inside the box. The support frame is a frame structure composed of multiple grid plates. The support frame has a cylindrical receiving cavity formed in the vertical direction, and the top of the support frame has an opening communicating with the receiving cavity. A pressure plate is slidably installed in the receiving cavity, and the pressure plate has multiple vent holes; The load block is placed on the pressure plate; The air intake system is connected to the bottom of the housing, the top of the housing is provided with an exhaust port, and the multimodal detection system is installed in the housing.

2. The cotton smoldering simulation and multimodal gas detection device according to claim 1, characterized in that, Also includes: A release mechanism is installed inside the housing and located above the support frame; The guide rod has one end connected to the release mechanism and the other end extending toward the support frame. The load block is slidably mounted on the guide rod, and the release mechanism is used to drive the load block to slide along the guide rod.

3. The cotton smoldering simulation and multimodal gas detection device according to claim 1, characterized in that, Also includes: A heating plate is installed at the bottom of the support frame to continuously heat the cotton inside the support frame; A lighter is installed inside the housing and extends toward the support frame.

4. The cotton smoldering simulation and multimodal gas detection device according to claim 2, characterized in that, The multimodal detection system includes: Multiple gas sensing elements are installed inside the housing and located on one side of the support frame. Each gas sensing element is used to detect different gas concentrations. The TDLAS gas detection module is installed in the enclosure. The TDLAS gas detection module is used to scan the absorption lines of gas molecules to measure the gas concentration.

5. The cotton smoldering simulation and multimodal gas detection device according to claim 4, characterized in that, The TDLAS gas detection module includes a laser emitter and a laser receiver. Optical windows are provided on opposite side walls of the housing. The laser emitter is installed in the optical window on one side wall of the housing, and the laser receiver is installed in the optical window on the other side wall of the housing. Both the laser emitter and the laser receiver are located outside the housing.

6. The cotton smoldering simulation and multimodal gas detection device according to claim 5, characterized in that, The laser emitting end sends laser light to the laser receiving end to form a laser optical path, and the projection area of ​​the guide rod on the horizontal plane does not overlap with the projection area of ​​the laser optical path on the horizontal plane.

7. The cotton smoldering simulation and multimodal gas detection device according to claim 1, characterized in that, The intake system includes: The system includes an air source, an air intake pipe, valves, and a humidification structure. One end of the air intake pipe is connected to the air source, and the other end extends into the housing and is located at the bottom of the support frame. The gas source is equipped with a valve to regulate the gas flow rate of the air intake pipe; The humidification structure is installed in the air intake pipe and is used to humidify the gas in the air intake pipe.

8. The cotton smoldering simulation and multimodal gas detection device according to claim 7, characterized in that, Also includes: A flow equalization plate is installed inside the housing, a support frame is installed on the flow equalization plate, an air intake pipe extends to the side of the flow equalization plate away from the support frame, and multiple air holes are evenly distributed on the flow equalization plate.

9. The cotton smoldering simulation and multimodal gas detection device according to claim 1, characterized in that, Also includes: Multiple thermocouples are inserted into the support frame to obtain the temperature of the cotton inside the support frame.

10. The cotton smoldering simulation and multimodal gas detection device according to claim 1, characterized in that, Also includes: An exhaust gas collection system is connected to the housing through the exhaust port.

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