Dynamic infrared detection system and method for coal moisture

Abstract

The invention relates to the field of coal moisture detection, in particular to a coal moisture dynamic infrared detection system and method. The system comprises a reactor, a material container, a detector and a parallel double-gas-path control gas path, the reactor provides a high-temperature environment (200 DEG C), and coal sample moisture is subjected to dry distillation through a heater; the material container is of an open aluminum structure, so 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 the water vapor concentration into a voltage signal; and the gas path control part switches a carrier gas path through an on-off valve, so that rapid switching between a reference value and real-time detection is realized. The method comprises the following steps: dynamically monitoring absorbance, carrying out integral calculation on total absorbance, and substituting the total absorbance into a quadratic function fitting model (W = a. As + b. As + c) to obtain the moisture content. Static balance waiting is not needed, the detection time is shortened, the device structure is simplified (no pressure detector is used), and the method is suitable for rapid batch detection scenes.

Description

Technical Field

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

[0002] Traditional coal moisture testing is mainly based on GB / T 211 "Determination of total moisture in coal" and GB / T 212 "Industrial analysis of coal"; that is, a certain mass of sample is weighed on a balance, placed in a constant temperature (105-110) °C oven, and after drying for a certain period of time, the sample is taken out, weighed and the mass is recorded. Then it is placed in the oven to dry for a certain period of time, taken out and weighed again, and the test drying process is repeated until the mass reduction does not exceed a certain value after two consecutive weighings. The above measurement method requires steps such as weighing, drying, cooling, and re-weighing, which are cumbersome and time-consuming (≥2 hours).

[0003] The prior art CN118914122A adopts a technical solution for infrared detection of coal moisture. This design method is a static equilibrium method, which requires waiting for the water vapor and inert gas to reach equilibrium in a sealed chamber. The equilibrium time required for the test is long, and it relies on pressure control to determine the equilibrium state. The device is complex and the detection efficiency is low. After testing the previous sample, this prior art solution discharges the tail gas of the sealed container through the vent valve. However, after the venting, there is still gas with a high moisture content in the container. When testing the next sample, the internal gas must be purged clean, otherwise it will cause cross-contamination to the next sample. In addition, this solution is difficult to ensure that the sampled gas is representative, and the test accuracy is poor. This method opens the sampling port after the water vapor reaches equilibrium and detects an absorbance response value through an infrared moisture detector. This method is to take out a small portion of the mixed gas for measurement, and use the moisture concentration of this small portion of gas to represent the moisture concentration in the entire mixed gas. However, due to the large volume of the sealed container and the stratification effect caused by the high temperature, it is difficult to take out representative gas for testing, resulting in poor test accuracy of this method. Summary of the Invention

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

[0005] To achieve the above objectives, this application provides the following technical solutions: A dynamic infrared detection system for coal moisture, comprising: a reactor, a material container, an infrared moisture detector and a parallel dual gas 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 heating and distillation environment for the coal sample; an air inlet is provided on one side of the reactor and an air outlet is provided on the other side; The material container is arranged in the reactor and is used to hold the coal sample to be tested; The control gas circuit includes: a first gas circuit and a second gas circuit arranged in parallel; One end of the first gas path is connected to the infrared moisture detector, and the other end is used to connect to the gas source to pass dry gas into the infrared moisture detector, and a first valve for controlling the opening and closing of the gas path is provided on the first gas path; The second gas circuit includes: a gas circuit I connected to the gas inlet, gas circuit I is used to connect to the gas source to pass dry gas into the reactor, and a second valve for controlling the on-off of the gas circuit is provided on gas circuit I; and a gas circuit II connected to the gas outlet of the reactor at one end and connected to the infrared moisture detector at the other end, gas circuit II is used to pass the mixed gas after the coal sample is dry-distilled in the reactor into the infrared moisture detector for detection; The infrared moisture detector is used to perform full-process real-time detection of the water vapor concentration in the mixed gas and output a voltage signal sequence.

[0006] Furthermore, the infrared moisture detector is used to obtain a continuous voltage signal sequence during the entire dry distillation process and calculate the instantaneous absorbance A in real time. i and by the absorbance A i The total absorbance A is obtained by integrating the time s To reflect the water release of the coal sample during the whole process. s Substitute into the quadratic function fitting model (W=a·A s ²+b·A s +c) to calculate the moisture content.

[0007] Furthermore, a pressure stabilizing valve for reducing the pressure of the gas provided by the gas source to a set pressure is also provided on the control gas circuits at the input ends of the first gas circuit and the second gas circuit arranged in parallel.

[0008] Furthermore, the heater heats inside the reactor to form a heating chamber that provides a high-temperature dry distillation environment for the coal sample, and a heat insulation layer is also 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 heating uniformity of the coal sample to be tested.

[0010] The present application also provides a method for dynamic infrared detection of coal moisture, including the above-mentioned dynamic infrared detection system for coal moisture, comprising the following steps: The reactor is heated and temperature-controlled to a preset target temperature, the target temperature range being 180-300 degrees Celsius; Connect the first gas path, and introduce inert dry gas into the infrared moisture detector. The infrared moisture detection sensor will measure the voltage value V0 of the whole process reference signal. Place the coal sample to be tested of known mass from the material container into the reactor; Disconnect the first gas line, connect the second gas line, introduce inert dry gas into the reactor, and measure the response voltage value V by the infrared moisture detector. i ; Calculate the real-time absorbance A of the sample based on the voltage reference value and the response voltage value i ; Based on the real-time absorbance of the sample A i Calculate the total absorbance A s and the total absorbance A s Substitute the function model to calculate the moisture content of coal.

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

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

[0013] Furthermore, when the absorbance A i When the value is less than the set threshold, the detection process is automatically ended and the detection result is output.

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

[0015] Beneficial effects: The application discloses a coal moisture dynamic infrared detection system and method, which realizes rapid and continuous detection of coal moisture through reactor high-temperature dry distillation and dynamic gas path switching, and solves the problem of low efficiency of a static method. s ²+b·A s +c)obtained by substituting the total absorbance into a quadratic function fitting model (W=a·A s ²+b·A s +c)obtained by substituting the total absorbance into a quadratic function fitting model (W=a·A

[0016] In addition, compared with the existing static infrared detection scheme, in the detection system and the detection method, the first gas path does not pass through the reaction container and is directly introduced into the infrared moisture detector, so that the measurement of the reference signal voltage is not disturbed by water vapor, and the measurement accuracy of the reference signal voltage is high. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 FIG. 1 is a structural schematic diagram of a coal moisture dynamic infrared detection system according to the present application; Figure 2 FIG. 2 is a flow chart of a coal moisture dynamic infrared detection method according to the present application; Figure 3 FIG. 5 is a result diagram of fitting total moisture content and total absorbance by using the least square method in the present embodiment; and Among them, 10, reactor, 11, material container, 12, heater, 13, temperature sensor, 14, infrared moisture detector, 15, first gas path, 16, second gas path, 17, first valve, 18, second valve, 19, air inlet, 20, air outlet, 21, pressure regulating valve, 22, gas tank. DETAILED DESCRIPTION

[0019] In order to help those skilled in the art 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 embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

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

[0021] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0023] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0024] The embodiments of the present application are written in a progressive manner.

[0025] See also Figure 1 , a coal moisture dynamic infrared detection system, comprising: a reactor, a material container, an infrared moisture detector and a parallel dual gas 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 heating and distillation environment for the coal sample; an air inlet is provided on one side of the reactor and an air outlet is provided on the other side; The material container is arranged in the reactor and is used to hold the coal sample to be tested; The control gas circuit includes: a first gas circuit and a second gas circuit arranged in parallel; One end of the first gas path is connected to the infrared moisture detector, and the other end is used to connect to the gas source to pass dry gas into the infrared moisture detector, and a first valve for controlling the opening and closing of the gas path is provided on the first gas path; The second gas circuit includes: a gas circuit I connected to the gas inlet, gas circuit I is used to connect to the gas source to pass dry gas into the reactor, and a second valve for controlling the on-off of the gas circuit is provided on gas circuit I; and a gas circuit II connected to the gas outlet of the reactor at one end and connected to the infrared moisture detector at the other end, gas circuit II is used to pass the mixed gas after the coal sample is dry-distilled in the reactor into the infrared moisture detector for detection; The infrared moisture detector is used to perform full-process real-time detection of the water vapor concentration in the mixed gas and output a voltage signal sequence.

[0026] The main components involved in the dynamic infrared detection system solution of coal moisture in the present 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 is integrated with 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, and the gas source is provided by a gas tank, which stores compressed inert dry gas, and the inert dry gas is nitrogen; it can be understood that the gas path I in the first gas path and the second gas path can also be connected to an external nitrogen supply pipeline.

[0028] Compared with the existing technical solutions: during the coal sample drying process, the sealed container is disconnected from the outside, and after the moisture is dried and balanced, the pressure balance is detected by the pressure sensor (the balance is determined when the set pressure is reached), the sampling port is opened to take a small amount of gas to obtain a detection value, and then the absorbance is calculated, and then the water content is calculated with the help of the absorbance.

[0029] In the scheme, the reactor high-temperature dry distillation + dynamic gas path switching is used to realize rapid and continuous detection of the moisture content of coal, and the problem of low efficiency of the static method is solved. Specifically, the reactor provides a high-temperature environment (preferably 200°C), and the moisture content of the coal sample is dry distilled by the heater. The material container is an open container with good heat conduction efficiency, which improves 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 part switches the carrier gas path through the switch valve to realize the rapid switching of the reference value and the real-time detection. The total absorbance is obtained by dynamically monitoring the absorbance and integrating calculation, and the moisture content is obtained by substituting the quadratic function fitting model (W=a·A s ²+b·A s +c). The scheme does not need to wait for static equilibrium, the detection time is shortened, and the device does not have a pressure detector. The analysis is ended by judging that the real-time detection value of the infrared moisture detector is less than the set threshold, which is suitable for rapid batch detection scene.

[0030] In addition, compared with the existing static infrared detection scheme, in the detection system and the detection method, the first gas path does not pass through the reaction container and is directly introduced into the infrared moisture detector, avoiding water vapor interference when measuring the reference signal voltage, and the reference signal voltage measurement accuracy is high. The design scheme does not need to wait for the mixed gas in the reactor to reach equilibrium, measures all the water vapor in the drying process of the coal sample, obtains the total water content in the whole process, avoids the problem of poor representativeness of gas sampling, and calculates the total absorbance into the quadratic function fitting model, solves the problem of high water content nonlinearity, the full-scale error is small, and the test precision is good.

[0031] Further, the infrared moisture detector is used to obtain a continuous voltage signal sequence in the whole dry distillation process, and to calculate the instantaneous absorbance A i in real time, and to obtain the total absorbance A i by time integration of the absorbance A s to reflect the whole process moisture release of the coal sample.

[0032] Further, a pressure stabilizing valve for reducing the gas provided by the gas source to a set pressure is further arranged on the control gas path of the input end of the parallelly arranged first gas path and second gas path. Through the design of the pressure stabilizing valve structure, the carrier gas pressure is effectively ensured to be constant, and the interference of gas flow fluctuation on infrared detection is eliminated.

[0033] Further, the heater heats in the reactor to form a heating cavity providing a high-temperature dry distillation environment for the coal sample, and a heat insulation layer is further arranged on the outer periphery of the reactor. The heat insulation layer structure design reduces heat loss and ensures dry distillation efficiency and heat insulation 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 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 of the present application also includes a controller, which is a single-chip microcomputer or a 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 first valve and the second valve that need to cooperate during the detection process of the infrared moisture detector are also controlled by the controller.

[0036] See also Figure 2 The present application also provides a method for dynamic infrared detection of coal moisture, including the above-mentioned dynamic infrared detection system for coal moisture, comprising the following steps: The reactor is heated and temperature-controlled to a preset target temperature 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 will measure the voltage value V0 of the whole process reference signal. Place the coal sample to be tested of known mass from the material container into the reactor; Disconnect the first gas line, connect the second gas line, introduce inert dry gas into the reactor, and measure the response voltage value V by the infrared moisture detector. i ; Calculate the real-time absorbance A of the sample based on the voltage reference value and the response voltage value i ; Based on the real-time absorbance of the sample A i Calculate the total absorbance A s and the total absorbance A s Substitute the function model to calculate the moisture content of coal.

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

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

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

[0040] Furthermore, when the absorbance A i When the absorbance is less than the set threshold, the detection process is automatically terminated and the detection result is output. i When it is less than 0.06, the total absorbance and coal moisture content are calculated; this design method reduces the impact of measurements between samples in the reactor, avoids ineffective waiting, and saves energy.

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

[0042] As a feasible method, 5 calibration samples were selected. The sample names and moisture contents are shown in Table 1 below: Table 1

[0043] Each calibration sample was measured twice, and the total absorbance was determined as shown in Table 2: Table 2

[0044] Calculate the total water content W of the calibration sample and use the least squares method to fit the total water content and total absorbance. The results are shown in the figure. Figure 3 ; Get 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, and the calculation results of the above model were compared with the measured values ​​of the standard method, as shown in Table 3 below: Table 3

[0045] The errors of the verification samples were strictly controlled below the repeatability limits specified in the GB / T 211 standard. Through rigorous verification in 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, ensuring the accuracy and reliability of the test results.

[0046] The coal moisture dynamic infrared detection system and its supporting detection method scheme proposed in this application have been comprehensively compared and analyzed with the existing patented technical schemes. The detailed comparison is shown in Table 4 below, from which it can be clearly seen that this scheme has significant advantages in detection efficiency, operation convenience and detection result accuracy.

[0047] The specific comparative analysis details are shown in Table 4 below: Table 4

[0048] Compared with existing coal moisture detection technologies, the coal moisture dynamic infrared detection system and method proposed in this application have achieved significant breakthroughs in detection efficiency, device structure, test accuracy and applicability. The specific beneficial effects are as follows: Detection efficiency significantly improved Dynamic Detection Mechanism: This application abandons the traditional static equilibrium waiting method and adopts high-temperature retort-dynamic infrared detection coupling technology. By real-time monitoring of water vapor concentration changes and integrating the total absorbance, it can achieve rapid determination of moisture content. Actual measurements have shown that the single detection time is significantly shortened, meeting the needs of rapid batch testing.

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

[0050] The device structure is streamlined and the reliability is enhanced Pressure sensor-free design: Existing technologies (such as CN118914122A) rely on pressure balance in a sealed chamber to determine the endpoint, requiring a high-precision pressure sensor and complex gas flow. This application uses an infrared moisture detector's real-time signal threshold to determine the endpoint, eliminating the pressure detection module and significantly reducing maintenance costs.

[0051] Modular gas path control: innovatively adopts parallel dual gas paths (the first gas path is for calibration reference, the second gas path is for dynamic detection) and valve linkage design to achieve rapid switching between reference value and sample detection.

[0052] Detection accuracy and adaptability optimization Quadratic function fitting model compensation: establish the total absorbance (A) through calibration experiment s ) and the quadratic function relationship between water content (W) (W = a·A s ²+b·As +c), effectively correcting for coal sample matrix interference and infrared signal nonlinearity. Validation data showed that the error of this method was less than 0.7% compared with the GB / T 211 standard method, 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 and anthracite. The high-temperature distillation environment avoids the interference of coal sample oxidation on the results during low-temperature drying (105-110℃).

[0054] Improved operational safety and environmental protection 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 thermal insulation layer design reduces heat loss and harmful gas escape, improving the laboratory operating environment.

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

Claims

1. A coal moisture dynamic infrared detection system, characterized in that: include: Reactor, material container, infrared moisture detector and parallel dual gas control gas circuit; The reactor is a sealable container, which is equipped with a heater and a temperature sensor to provide a high-temperature heating and distillation environment for the coal sample; an air inlet is provided on one side of the reactor and an air outlet is provided on the other side; The material container is arranged in the reactor and is used to hold the coal sample to be tested; The parallel dual-gas control gas circuit comprises: a first gas circuit and a second gas circuit arranged in parallel; One end of the first gas path is connected to the infrared moisture detector, and the other end is used to connect to the gas source to pass dry gas into the infrared moisture detector, and a first valve for controlling the opening and closing of the gas path is provided on the first gas path; The second gas circuit includes: a gas circuit I connected to the gas inlet, gas circuit I is used to connect to the gas source to pass dry gas into the reactor, and a second valve for controlling the on-off of the gas circuit is provided on gas circuit I; and a gas circuit II connected to the gas outlet of the reactor at one end and connected to the infrared moisture detector at the other end, gas circuit II is used to pass the mixed gas after the coal sample is dry-distilled in the reactor into the infrared moisture detector for detection; The infrared moisture detector is used to perform full-process real-time detection of the water vapor concentration in the mixed gas and output a voltage signal sequence.

2. The coal moisture dynamic infrared detection system according to claim 1, characterized in that: The infrared moisture detector is used to obtain the continuous voltage signal sequence during the entire distillation process and calculate the instantaneous absorbance A in real time. i and by the absorbance A i The total absorbance A is obtained by integrating the time s To reflect the moisture release of the coal sample throughout the entire process.

3. The coal moisture dynamic infrared detection system according to claim 1 or 2, characterized in that: The control gas paths at the input ends of the first gas path and the second gas path arranged in parallel are further provided with pressure-stabilizing valves for reducing the pressure of the gas provided by the gas source to a set pressure.

4. The coal moisture dynamic infrared detection system according to claim 3, characterized in that: The heater is heated in the reactor to form a heating chamber that provides a high-temperature dry distillation environment for the coal sample, and a heat insulation layer is also arranged on the periphery of the reactor.

5. The coal moisture dynamic infrared detection system according to claim 4, 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.

6. A method for dynamic infrared detection of coal moisture, comprising the dynamic infrared detection system for coal moisture according to any one of claims 1 to 5, characterized in that: The following steps are involved: The reactor is heated and temperature-controlled to a preset target temperature, the target temperature range being 180-300 degrees Celsius; Connect the first gas path, and introduce inert dry gas into the infrared moisture detector. The infrared moisture detection sensor will measure the voltage value V0 of the whole process reference signal. Place the coal sample to be tested of known mass from the material container into the reactor; Disconnect the first gas line, connect the second gas line, introduce inert dry gas into the reactor, and measure the response voltage value V by the infrared moisture detector. i ; Calculate the real-time absorbance A of the sample based on the voltage reference value and the response voltage value i ; Based on the real-time absorbance of the sample A i Calculate the total absorbance A s and the total absorbance A s Substitute the function model to calculate the moisture content of coal.

7. The method for dynamic infrared detection of coal moisture according to claim 6, characterized in that: The real-time absorbance of the sample A i Based on the following formula: ； Among them, V0 is the reference signal voltage value; V i is the response voltage value; The total absorbance A s Based on the following formula: 。 8. The method for dynamic infrared detection of coal moisture according to claim 7, characterized in that: When the absorbance A is obtained i When the value is less than the set threshold, the detection process is automatically ended and the detection result is output.

9. The method for dynamic infrared detection of coal moisture according to any one of claims 6 to 8, characterized in that: The function model is established by calibrating the sample, with the help of the total absorbance A of the calibration 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.

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

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