A dynamic infrared detection system and method for coal moisture content

Abstract

This application relates to the field of coal moisture detection, and more particularly to a dynamic infrared detection system and method for coal moisture. The system includes a reactor, a material container, a detector, and a parallel dual-gas-path control system. The reactor provides a high-temperature environment (200℃) for the dry distillation of coal sample moisture using a heater. The material container is an open aluminum structure, ensuring that the coal sample is thin and uniformly heated. The detector detects the water vapor concentration carried by the carrier gas in real time and converts it into a voltage signal. The gas path control section switches the carrier gas path via on / off valves, achieving rapid switching between reference values ​​and real-time detection. The method dynamically monitors absorbance and integrates to calculate the total absorbance, then substitutes it into a quadratic function fitting model (W=a·A). s ²+b·A s +c) yields the moisture content. This invention eliminates the need for static equilibrium waiting, shortens the detection time, and simplifies the device structure (no pressure detector), making it suitable for rapid batch detection scenarios.

Description

Technical Field

[0001] This application relates to the field of coal moisture detection, specifically to a dynamic infrared detection system and method for coal moisture. Background Technology

[0002] Traditional coal moisture testing mainly follows GB / T 211 "Determination of Total Moisture in Coal" and GB / T 212 "Industrial Analysis Methods for Coal". This involves weighing a certain mass of the sample using a balance, placing it in an oven at a constant temperature (105~110)℃, drying it for a certain period of time, weighing the sample, and recording the mass. This process is repeated until the mass decreases by no more than a certain value between two consecutive weighings. This method requires weighing, drying, cooling, and reweighing, making it cumbersome and time-consuming (≥2 hours).

[0003] The existing technology CN118914122A employs an infrared method for detecting coal moisture. This method is a static equilibrium method, requiring the water vapor and inert gas to mix and reach equilibrium in a sealed chamber. This results in a long equilibrium time, reliance on pressure control to determine the equilibrium state, complex equipment, and low detection efficiency. After testing one sample, the existing technology vents the exhaust gas from the sealed container via a vent valve. However, even after venting, gas with a high moisture content still remains in the container. Before testing the next sample, the internal gas must be purged to prevent cross-contamination. Furthermore, this method struggles to ensure the representativeness of the sampled gas, leading to poor testing accuracy. Another method involves opening the sampling port after water vapor reaches equilibrium and detecting an absorbance response value using an infrared moisture detector. This method measures a small portion of the mixed gas, using its moisture concentration to represent the overall moisture concentration. However, due to the large volume of the sealed container and the stratification effect caused by high temperature, it is difficult to obtain representative gas samples, resulting in poor testing accuracy. Summary of the Invention

[0004] This application provides a dynamic infrared detection system and method for coal moisture, aiming to solve the problems of low detection efficiency, poor testing accuracy and complex operation in the prior art.

[0005] To achieve the above objectives, this application provides the following technical solution: A dynamic infrared detection system for coal moisture includes: a reactor, a material container, an infrared moisture detector, and a parallel dual-path control gas path; The reactor is a sealable container, which is equipped with a heater and a temperature sensor to provide a high-temperature carbonization environment for heating the coal sample; the reactor has an air inlet on one side and an air outlet on the other side. The material container is arranged inside the reactor and is used to hold the coal sample to be tested; The control air path includes: a first air path and a second air path arranged in parallel; One end of the first gas path is connected to an infrared moisture detector, and the other end is used to connect to a gas source to introduce dry gas into the infrared moisture detector. A first valve is provided on the first gas path to control the opening and closing of the gas path. The second gas path includes: gas path I connected to the air inlet, gas path I is used to connect the gas source to the reactor to introduce dry gas, and gas path I is provided with a second valve to control the opening and closing of the gas path; and gas path II connected to the air outlet of the reactor at one end and connected to the infrared moisture detector at the other end, gas path II is used to introduce the mixed gas after the reactor dries the coal sample into the infrared moisture detector for detection. The infrared moisture detector is used to detect the water vapor concentration in the mixed gas in real time throughout the entire process and output a voltage signal sequence.

[0006] Furthermore, the infrared moisture detector is used to acquire a continuous voltage signal sequence throughout the entire distillation process and to calculate the instantaneous absorbance A in real time. i And by measuring absorbance A i The total absorbance A is obtained by time integration. s This reflects the moisture release from the coal sample throughout the entire process. Specifically, the total absorbance A... s Substitute into the quadratic function fitting model (W=a·A) s ²+b·A s The moisture content can be calculated using the formula +c.

[0007] Furthermore, the control air lines at the input ends of both the first and second air lines, which are set in parallel, are also equipped with pressure regulating valves for reducing the pressure of the gas supplied by the gas source to a set pressure.

[0008] Furthermore, the heater heats the reactor to form a heating chamber that provides a high-temperature dry distillation environment for the coal sample, and an insulation layer is arranged around the reactor.

[0009] Furthermore, the heater is a resistance wire heater, and the material container is placed on the heater. The material container is an open container made of a material with high thermal conductivity to ensure the uniform heating of the coal sample to be tested.

[0010] This application also provides a method for dynamic infrared detection of coal moisture, including the aforementioned dynamic infrared detection system for coal moisture, comprising the following steps: The reactor is heated and the temperature is controlled to a preset target temperature, which is 180-300 degrees Celsius. Connect the first gas path and introduce inert dry gas into the infrared moisture detector. The infrared moisture detection sensor measures the reference signal voltage value V0 for the entire process. A coal sample of known mass is placed into the reactor from a material container. Disconnect the first gas path, connect the second gas path, and introduce inert dry gas into the reactor. The response voltage value V is measured by an infrared moisture detector. i The real-time absorbance A of the sample is calculated based on the voltage reference value and the response voltage value. i ; Based on the obtained real-time absorbance A of the sample i The total absorbance A was calculated. s and the total absorbance A s The moisture content of the coal is calculated by substituting it into the function model.

[0011] Furthermore, the real-time absorbance A of the sample i Obtained based on the following formula: ; Where V0 is the reference signal voltage value; V i This is the response voltage value.

[0012] The total absorbance A s Obtained based on the following formula: .

[0013] Furthermore, when the obtained absorbance A i Once the value falls below the set threshold, the detection process automatically ends and the detection result is output.

[0014] Furthermore, the function model is established by calibrating the sample, using the total absorbance A of the calibrated sample. s Establish a functional relationship with the total water content W, calculate the parameters using the least squares method, and determine the functional model; specifically: Select at least two sets of standard coal samples with known moisture content and measure the total absorbance A. s Total moisture content W; Total moisture content W = mass of standard coal sample m × moisture content M; A is fitted using the least squares method s Functional relationship with W: W = a × A s 2 +b×A s +c; obtain the coefficients a, b, and c of the function model to determine the function model.

[0015] Beneficial effects: This application discloses a dynamic infrared detection system and method for coal moisture. It achieves rapid and continuous detection of coal moisture through high-temperature dry distillation in a reactor and dynamic gas path switching, solving the problem of low efficiency in static methods. Specifically, the reactor provides a high-temperature environment (200℃), and the coal sample moisture is dry-distilled using a heater. The material container is an open container with good thermal conductivity, improving the uniform heating efficiency of the coal sample. The infrared moisture detector detects the water vapor concentration carried by the carrier gas in real time and converts it into a voltage signal. The gas path control section switches the carrier gas path by switching valves, achieving rapid switching between the baseline value and real-time detection. The absorbance is dynamically monitored and the total absorbance is calculated by integration, then substituted into a quadratic function fitting model (W=a·A). s ²+b·A s +c) The moisture content is obtained; the solution of this application does not require static equilibrium waiting, the detection time is shortened, and the device has no pressure detector. The end of the analysis is determined by the real-time detection value of the infrared moisture detector being less than the set threshold, which is suitable for rapid batch detection scenarios.

[0016] Furthermore, compared to existing static infrared detection schemes, in the detection system and method of this application, the first gas path is directly introduced into the infrared moisture detector without passing through the reaction vessel, avoiding water vapor interference when measuring the reference signal voltage, and the reference signal voltage measurement accuracy is high. The design scheme of this application does not require waiting for the mixed gas in the reactor to reach equilibrium, but measures the mixed gas of all water vapor during the coal sample drying process, obtaining the moisture test value of the whole process, avoiding the problem of poor gas sampling representativeness. In addition, the total absorbance is brought into the quadratic function fitting model for calculation, solving the nonlinear problem of high moisture content, with small error across the whole range and good test accuracy. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. 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 a dynamic infrared detection system for coal moisture according to this application; Figure 2 This is a flowchart of a dynamic infrared detection method for coal moisture according to this application; Figure 3 This is a diagram illustrating the results of fitting the total water content and total absorbance using the least squares method in this embodiment; Among them, 10 is the reactor, 11 is the material container, 12 is the heater, 13 is the temperature sensor, 14 is the infrared moisture detector, 15 is the first gas path, 16 is the second gas path, 17 is the first valve, 18 is the second valve, 19 is the air inlet, 20 is the air outlet, 21 is the pressure regulator, and 22 is the gas tank. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0021] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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.

[0022] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0023] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0024] The embodiments in this application are written in a progressive manner.

[0025] See Figure 1 A dynamic infrared detection system for coal moisture includes: a reactor, a material container, an infrared moisture detector, and a parallel dual-channel control gas path; The reactor is a sealable container, which is equipped with a heater and a temperature sensor to provide a high-temperature carbonization environment for heating the coal sample; the reactor has an air inlet on one side and an air outlet on the other side. The material container is arranged inside the reactor and is used to hold the coal sample to be tested; The control air path includes: a first air path and a second air path arranged in parallel; One end of the first gas path is connected to an infrared moisture detector, and the other end is used to connect to a gas source to introduce dry gas into the infrared moisture detector. A first valve is provided on the first gas path to control the opening and closing of the gas path. The second gas path includes: gas path I connected to the air inlet, gas path I is used to connect the gas source to the reactor to introduce dry gas, and gas path I is provided with a second valve to control the opening and closing of the gas path; and gas path II connected to the air outlet of the reactor at one end and connected to the infrared moisture detector at the other end, gas path II is used to introduce the mixed gas after the reactor dries the coal sample into the infrared moisture detector for detection. The infrared moisture detector is used to detect the water vapor concentration in the mixed gas in real time throughout the entire process and output a voltage signal sequence.

[0026] The main components involved in the dynamic infrared detection system for coal moisture proposed in this application include: a reactor 10, a material container 11, a heater 12, a temperature sensor 13, an infrared moisture detector 14, a first gas path 15, a second gas path 16, a first valve 17, a second valve 18, an air inlet 19, an air outlet 20, a pressure regulating valve 21, and a gas tank 22; the infrared moisture detector integrates a microcontroller MCU, and the microcontroller MCU is configured with a quadratic function fitting model.

[0027] In this embodiment, the first valve and the second valve are preferably solenoid valves. The gas source is provided by a gas tank, which stores compressed inert dry gas, which is nitrogen. It can be understood that gas line I in the first gas line and the second gas line can also be connected to an external nitrogen gas supply line.

[0028] Compared to existing technical solutions: During the coal sample drying process, the sealed container is disconnected from the outside. After the moisture dries and reaches equilibrium, the pressure balance is detected by a pressure sensor (equilibrium is determined when the set pressure is reached). A small portion of the gas is taken through the sampling port to obtain a detection value. Then, the absorbance is calculated, and the moisture content is calculated using this absorbance.

[0029] In this application, rapid and continuous detection of coal moisture is achieved through high-temperature dry distillation in a reactor combined with dynamic gas path switching, solving the problem of low efficiency in static methods. Specifically, the reactor provides a high-temperature environment (preferably 200℃), and the coal sample moisture is dry-distilled using a heater. The material container is an open container with good thermal conductivity, improving the uniform heating efficiency of the coal sample. An infrared moisture detector detects the water vapor concentration carried by the carrier gas in real time and converts it into a voltage signal. The gas path control section switches the carrier gas path by switching valves, achieving rapid switching between the baseline value and real-time detection. The absorbance is dynamically monitored and the total absorbance is calculated by integration, then substituted into a quadratic function fitting model (W=a·A). s ²+b·A s +c) The moisture content is obtained; the solution of this application does not require static equilibrium waiting, the detection time is shortened, and the device has no pressure detector. The end of the analysis is determined by the real-time detection value of the infrared moisture detector being less than the set threshold, which is suitable for rapid batch detection scenarios.

[0030] Furthermore, compared to existing static infrared detection schemes, in the detection system and method of this application, the first gas path is directly introduced into the infrared moisture detector without passing through the reaction vessel, avoiding water vapor interference when measuring the reference signal voltage, and the reference signal voltage measurement accuracy is high. The design scheme of this application does not require waiting for the mixed gas in the reactor to reach equilibrium, but measures the mixed gas of all water vapor during the coal sample drying process, obtaining the moisture test value of the whole process, avoiding the problem of poor gas sampling representativeness. In addition, the total absorbance is brought into the quadratic function fitting model for calculation, solving the nonlinear problem of high moisture content, with small error across the whole range and good test accuracy.

[0031] Furthermore, the infrared moisture detector is used to acquire a continuous voltage signal sequence throughout the entire distillation process and to calculate the instantaneous absorbance A in real time. i And by measuring absorbance A i The total absorbance A is obtained by time integration. s To reflect the moisture release of the coal sample throughout the entire process.

[0032] Furthermore, the control gas lines at the input ends of both the first and second gas lines, which are configured in parallel, are equipped with pressure regulating valves to reduce the pressure of the gas supplied by the gas source to a set pressure. This pressure regulating valve design effectively ensures a constant carrier gas pressure and eliminates interference from airflow fluctuations on infrared detection.

[0033] Furthermore, a heater heats the reactor to form a heating chamber that provides a high-temperature carbonization environment for the coal sample, and an insulation layer is arranged around the reactor. This insulation layer design reduces heat loss and ensures carbonization efficiency and thermal safety.

[0034] Furthermore, the heater is a resistance wire heater, and the material container is placed on the heater. The material container is an open container made of a material with high thermal conductivity to ensure the uniform heating of the coal sample to be tested. The material of the material container includes, but is not limited to, steel, copper, and aluminum alloy.

[0035] The system in this application also includes a controller, which is a microcontroller or PLC controller. The first valve, the second valve, the heater, the temperature sensor, and the infrared moisture detector are all connected to the controller. It can be understood that the temperature sensor transmits the detected temperature information to the controller, and the heater is controlled by the controller to heat. The on / off state of the first and second valves, which need to cooperate with the infrared moisture detector during the detection process, is also controlled by the controller.

[0036] See Figure 2 This application also provides a method for dynamic infrared detection of coal moisture, including the aforementioned dynamic infrared detection system for coal moisture, comprising the following steps: The reactor is heated and the temperature is controlled to a preset target temperature, which is in the range of 180-300 degrees Celsius, preferably 200 degrees Celsius. Connect the first gas path and introduce inert dry gas into the infrared moisture detector. The infrared moisture detection sensor measures the reference signal voltage value V0 for the entire process. A coal sample of known mass is placed into the reactor from a material container. Disconnect the first gas path, connect the second gas path, and introduce inert dry gas into the reactor. The response voltage value V is measured by an infrared moisture detector. i The real-time absorbance A of the sample is calculated based on the voltage reference value and the response voltage value. i ; Based on the obtained real-time absorbance A of the sample i The total absorbance A was calculated. s and the total absorbance A s The moisture content of the coal is calculated by substituting it into the function model.

[0037] In this embodiment, the preset target temperature is preferably 200 degrees Celsius.

[0038] Furthermore, the real-time absorbance A of the sample i Obtained based on the following formula: ; Where V0 is the reference signal voltage value; V i This is the response voltage value.

[0039] The total absorbance A s Obtained based on the following formula: .

[0040] Furthermore, when the obtained absorbance A i Once the absorbance falls below a set threshold, the detection process automatically ends and the detection result is output. In this embodiment, the absorbance A is set. i Once the absorbance is less than 0.06, the total absorbance and coal moisture content are calculated. This design reduces the influence of measurements between samples in the reactor, avoids unnecessary waiting, and saves energy.

[0041] Furthermore, the function model is established by calibrating the sample, using the total absorbance A of the calibrated sample. s Establish a functional relationship with the total water content W, calculate the parameters using the least squares method, and determine the functional model; specifically: Select at least two sets of standard coal samples with known moisture content and measure the total absorbance A. s Total moisture content W; Total moisture content W = mass of standard coal sample m × moisture content M; A is fitted using the least squares method s Functional relationship with W: W = a × A s 2 +b×A s +c; obtain the coefficients a, b, and c of the function model to determine the function model.

[0042] As a feasible approach, five calibration samples were selected, and their sample names and moisture contents are shown in Table 1 below: Table 1

[0043] Each calibration sample was measured twice, and the total absorbance measurements are shown in Table 2 below: Table 2

[0044] The total water content W of the calibrated sample was calculated, and the total water content and total absorbance were fitted using the least squares method. The results are shown in the figure. Figure 3 ; Obtain W and A s Functional relationship: W = -0.00000095 × A s 2 +0.00899408×A s -0.34129629; Furthermore, four samples were selected and tested twice. The results calculated using the above model were compared and verified with the measured values ​​using the standard method, as shown in Table 3 below: Table 3

[0045] The errors of the verification samples were strictly controlled below the repeatability limit specified in GB / T 211. Through rigorous verification of a series of actual test cases, it was fully demonstrated that there were no significant differences between the design of this application scheme and the national standard test method, thus ensuring the accuracy and reliability of the test results.

[0046] The dynamic infrared detection system for coal moisture and its supporting detection method proposed in this application have been comprehensively compared and analyzed with existing patented technologies. The detailed comparison is shown in Table 4 below, which clearly shows the significant advantages of this solution in terms of detection efficiency, ease of operation, and accuracy of detection results.

[0047] The detailed comparative analysis is shown in Table 4 below: Table 4

[0048] Compared with existing coal moisture detection technologies, the dynamic infrared detection system and method for coal moisture proposed in this application have achieved significant breakthroughs in detection efficiency, device structure, testing accuracy, and applicability. The specific beneficial effects are as follows: Detection efficiency has been significantly improved. Dynamic detection mechanism: This application abandons the traditional static equilibrium waiting method and adopts a high-temperature dry distillation-dynamic infrared detection coupling technology. By monitoring the change in water vapor concentration in real time and integrating to calculate the total absorbance, rapid determination of moisture content is achieved. Experimental results show that the single detection time is significantly shortened, meeting the needs of rapid batch detection.

[0049] Simplified process: No need for repeated weighing, cooling or reweighing, avoiding the cumbersome "constant weight-re-drying" operation in GB / T 211 / 212 standard, and reducing labor costs.

[0050] The device has a simplified structure and enhanced reliability. Pressure sensor elimination design: Existing technologies (such as CN118914122A) rely on the pressure balance of the sealed cavity to determine the endpoint, requiring the configuration of a high-precision pressure sensor and a complex gas path. This application determines the endpoint by using a real-time signal threshold from an infrared moisture detector, eliminating the need for a pressure detection module and significantly reducing maintenance costs.

[0051] Modular gas path control: The innovative parallel dual gas path (first gas path for calibration reference, second gas path for dynamic detection) and valve linkage design enable rapid switching between reference value and sample detection.

[0052] Detection accuracy and adaptability optimization Quadratic function fitting model compensation: Establishing the total absorbance (A) through calibration experiments s The quadratic function relationship between water content (W) and water content (W=a·A) s ²+b·As (+c), effectively correcting for coal sample matrix interference and infrared signal nonlinearity errors. Validation data show that, compared with the GB / T 211 standard method, the errors of this method are all less than 0.7%, with no significant difference.

[0053] Wide temperature range adaptability: The target temperature range is 180-300℃, which can cover the moisture detection needs of coals with different metamorphic degrees, such as lignite to anthracite. Moreover, the high-temperature dry distillation environment avoids the interference of coal sample oxidation on the results during low-temperature drying (105-110℃).

[0054] Improved operational safety and environmental friendliness Inert gas protection: Nitrogen and other inert gases are used as carrier gases throughout the process to isolate oxygen and prevent the risk of high-temperature oxidation of coal samples or dust explosion.

[0055] Closed system design: The reactor's sealed structure, combined with the insulation layer design, reduces heat loss and the escape of harmful gases, improving the laboratory operating environment.

[0056] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dynamic infrared detection system for coal moisture, characterized in that, include: Reactor, material container, infrared moisture detector, and parallel dual-channel control gas path; The reactor is a sealable container, which is equipped with a heater and a temperature sensor to provide a high-temperature carbonization environment for heating the coal sample; the reactor has an air inlet on one side and an air outlet on the other side. The material container is arranged inside the reactor and is used to hold the coal sample to be tested; The parallel dual-air-path control air path includes: a first air path and a second air path arranged in parallel; One end of the first gas path is connected to an infrared moisture detector, and the other end is used to connect to a gas source to introduce dry gas into the infrared moisture detector. A first valve is provided on the first gas path to control the opening and closing of the gas path. The second gas path includes: gas path I connected to the air inlet, gas path I is used to connect the gas source to the reactor to introduce dry gas, and gas path I is provided with a second valve to control the opening and closing of the gas path; and gas path II connected to the air outlet of the reactor at one end and connected to the infrared moisture detector at the other end, gas path II is used to introduce the mixed gas after the reactor dries the coal sample into the infrared moisture detector for detection. The infrared moisture detector is used to detect the water vapor concentration in the mixed gas in real time throughout the entire process and output a voltage signal sequence. The infrared moisture detector is used to acquire a continuous voltage signal sequence throughout the entire dry distillation process and to calculate the instantaneous absorbance A in real time. i And by measuring absorbance A i The total absorbance A is obtained by time integration. s To reflect the moisture release of the coal sample throughout the entire process.

2. The dynamic infrared detection system for coal moisture according to claim 1, characterized in that, The control air lines at the input ends of the first and second air lines, which are set in parallel, are also equipped with pressure regulating valves for reducing the pressure of the gas supplied by the gas source to the set pressure.

3. The dynamic infrared detection system for coal moisture according to claim 2, characterized in that, The heater heats the reactor to form a heating chamber that provides a high-temperature carbonization environment for the coal sample, and an insulation layer is also arranged around the reactor.

4. The dynamic infrared detection system for coal moisture according to claim 3, characterized in that, The heater is a resistance wire heater, and the material container is placed on the heater. The material container is an open container made of a material with high thermal conductivity.

5. A method for dynamic infrared detection of coal moisture, comprising the dynamic infrared detection system for coal moisture as described in any one of claims 1-4, characterized in that, Includes the following steps: The reactor is heated and the temperature is controlled to a preset target temperature, which is 180-300 degrees Celsius. Connect the first gas path and introduce inert dry gas into the infrared moisture detector. The infrared moisture detection sensor measures the reference signal voltage value V0 for the entire process. A coal sample of known mass is placed into the reactor from a material container. Disconnect the first gas path, connect the second gas path, and introduce inert dry gas into the reactor. The response voltage value V is measured by an infrared moisture detector. i The real-time absorbance A of the sample is calculated based on the voltage reference value and the response voltage value. i ; Based on the obtained real-time absorbance A of the sample i The total absorbance A was calculated. s and the total absorbance A s The moisture content of the coal is calculated by substituting it into the function model.

6. The method for dynamic infrared detection of coal moisture according to claim 5, characterized in that, The real-time absorbance A of the sample i Obtained based on the following formula: ； Where V0 is the reference signal voltage value; V i The response voltage value; The total absorbance A s Obtained based on the following formula: 。 7. The method for dynamic infrared detection of coal moisture according to claim 6, characterized in that, When the absorbance A is obtained i Once the value falls below the set threshold, the detection process automatically ends and the detection result is output.

8. The method for dynamic infrared detection of coal moisture according to any one of claims 5-7, characterized in that, The function model is established by calibrating the sample, using the total absorbance A of the calibrated sample. s A functional relationship is established with the total water content W, and the parameters are calculated using the least squares method to determine the functional model.

9. The dynamic infrared detection method for coal moisture according to claim 8, wherein the function model is established by calibrating samples, and the total absorbance A of the calibrated samples is used as a reference. s Establish a functional relationship with the total water content W, calculate the parameters using the least squares method, and determine the functional model; specifically including: Select at least two sets of standard coal samples with known moisture content and measure the total absorbance A. s and total moisture content W; Total moisture content W = mass of standard coal sample m × moisture content M; Fitting A using the least squares method s The functional relationship between W and A is: W = a × A s 2 +b×A s +c; obtain the coefficients a, b, and c of the function model to determine the function model.

Images