A dynamic infrared detection system for coal moisture

Abstract

This application relates to the field of coal moisture detection, and more particularly to a dynamic infrared detection system for coal moisture. The system includes a reactor, a material container, a detector, and a parallel dual-path control gas path. The reactor provides a high-temperature environment (200°C) for the dry distillation of coal sample moisture using a heater. The material container is an open aluminum structure, ensuring thin and uniform heating of the coal sample. 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, enabling rapid switching between reference values ​​and real-time detection. The first gas path in the system bypasses the reaction container and directly enters the infrared moisture detector, avoiding water vapor interference when measuring the reference signal voltage, resulting in high accuracy of the reference signal voltage measurement. Furthermore, by setting the absorbance Ai threshold for the infrared moisture detector, a mixed gas measurement of all water vapor during the drying process of the coal sample in the reactor is obtained, avoiding the problem of poor gas sampling representativeness and minimizing testing accuracy error.

Description

Technical Field

[0001] This application relates to the field of coal moisture detection, specifically to a dynamic infrared detection system 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. Furthermore, 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. In addition, the existing solution suffers from poor testing accuracy: after the water vapor reaches equilibrium, the sampling port is opened, and an infrared moisture detector detects an absorbance response value. 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 a representative sample. In other words, the sampling representativeness is poor, and gas stratification within the sealed chamber leads to uneven local moisture concentrations, resulting in poor measurement accuracy. Utility Model Content

[0004] This application provides a dynamic infrared detection system for coal moisture, which enables rapid, high-precision, and continuous detection, aiming to solve the problems of low detection efficiency and poor testing accuracy in existing technologies.

[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 moisture content of the coal sample to be tested.

[0006] 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.

[0007] 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.

[0008] 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.

[0009] Furthermore, the material of the material container includes, but is not limited to, copper, steel, or aluminum alloy.

[0010] Furthermore, the detection system of this application also includes a controller, and the heater, temperature sensor, infrared moisture detector, and valves controlling the gas path are all connected to the controller; the temperature sensor transmits the detected temperature information to the controller, the controller controls the heating of the heater, and controls the opening and closing of the first and second valves that need to cooperate with the infrared moisture detector during the detection process. Furthermore, the controller is a microcontroller or a PLC controller.

[0011] Furthermore, both the first and second valves are solenoid valves. The pressure regulating valve is preferably a solenoid valve.

[0012] 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 combined with 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 gas path control section switches the carrier gas path via valves, achieving rapid switching between reference values ​​and real-time detection. The first gas path in the system directly enters the infrared moisture detector without passing through the reaction container, avoiding water vapor interference when measuring the reference signal voltage, resulting in high accuracy of the reference signal voltage measurement. Furthermore, this system does not require a pressure sensor and does not require waiting for the mixed gas in the reactor to reach equilibrium. It measures the mixed gas containing all water vapor during the coal sample drying process, and the absorbance A set by the infrared moisture detector is used for measurement. i The threshold is used to obtain a mixed gas measurement of all water vapor during the drying process of coal samples in the reactor, avoiding the problem of poor gas sampling representativeness and small test accuracy error. Attached Figure Description

[0013] 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.

[0014] Figure 1 This is a schematic diagram of the structure of a dynamic infrared detection system for coal moisture according to this application; 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

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] The embodiments in this application are written in a progressive manner.

[0021] 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 moisture content of the coal sample to be tested.

[0022] It is understood that the infrared moisture detector can acquire a continuous voltage signal sequence throughout the entire dry distillation process and 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 Then, using the total absorbance A s The calculations reflect the moisture content of the coal sample throughout the entire process.

[0023] The infrared moisture detector in this embodiment is the Kaiyuan Instruments H09 series infrared moisture detector, which has an absorbance A i Threshold setting function.

[0024] 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.

[0025] 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 through 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 reference value and real-time detection. The first gas path in the system directly enters the infrared moisture detector without passing through the reaction container, avoiding water vapor interference when measuring the reference signal voltage, resulting in high accuracy of the reference signal voltage measurement. In addition, the system of this application does not require the design of a pressure sensor and does not need to wait for the mixed gas in the reactor to reach equilibrium. It measures the mixed gas of all water vapor during the coal sample drying process, and the absorbance A set by the infrared moisture detector is used to measure the moisture content. i The threshold is used to obtain a mixed gas measurement of all water vapor during the drying process of coal samples in the reactor, avoiding the problem of poor gas sampling representativeness and small test accuracy error.

[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. In this embodiment, the first and second valves are preferably solenoid valves, and the pressure regulating valve is also preferably a solenoid valve; the gas source is provided by the gas tank, which stores compressed inert dry gas, namely nitrogen; it is understood that gas path I in the first and second gas paths can also be externally connected to a nitrogen supply pipeline.

[0027] The reactor is a sealed box structure consisting of a sealed box body and a sealed box cover, with a sealing ring or sealing strip between the box body and the box cover; that is, the reactor is a design based on existing technology, and will not be described in detail.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] This application system also includes a controller, which is a microcontroller or PLC controller. The first valve, second valve, heater, temperature sensor, and infrared moisture detector are all connected to the controller. It is understood that the temperature sensor transmits the detected temperature information to the controller, and the heater is controlled by the controller. The on / off state of the first and second valves, which need to cooperate with the infrared moisture detector detection process, is also controlled by the controller. The controller has gas path switching logic, which realizes rapid gas path switching through a solenoid valve, and adjusts the gas path based on the absorbance A of the infrared moisture detector. i (A) i =Ln(V0 / V i The detection will automatically terminate at the threshold.

[0032] In a test application of the dynamic infrared detection system for coal moisture in this application: The reactor is heated and its temperature controlled by a controller to a preset target temperature, which is in the range of 180-300 degrees Celsius, preferably 200 degrees Celsius. The controller controls the connection of the first gas path, and inert dry gas is introduced into the infrared moisture detector. The infrared moisture detection sensor measures the reference signal voltage value V0 for the whole process. A coal sample of known mass is placed into the reactor from a material container; the controller disconnects the first gas path and connects the second gas path, introducing inert dry gas into the reactor, and 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 Based on total absorbance A s Then calculate the moisture content of the coal.

[0033] The real-time absorbance A of the sample i : ; Where V0 is the reference signal voltage value; V i This is the response voltage value.

[0034] Total absorbance A s : .

[0035] In this application system, when the absorbance A obtained by the infrared moisture detector... i Once the absorbance is below the set threshold, the detection process automatically ends and the detection result is output; Absorbance A i The threshold is set to be less than 0.06. The system design of this application eliminates the need for pressure sensors to wait for the mixed gas in the reactor to reach equilibrium, avoiding unnecessary waiting and saving energy; at the same time, it realizes the measurement of moisture in the coal sample throughout the entire dry distillation process in the reactor; the measurement error is small.

[0036] The coal moisture dynamic infrared detection system proposed in this application innovatively adopts a parallel dual-gas path design (first gas path for benchmark calibration, second gas path for dynamic detection) and valve linkage design to achieve rapid switching between benchmark value and sample detection. This application eliminates the pressure sensor design, abandons the traditional static equilibrium waiting method, and employs high-temperature dry distillation-dynamic infrared detection coupling technology, setting the absorbance A through an infrared moisture detector. i The threshold was used to measure the moisture content of the coal sample during the entire dry distillation process in the reactor. The measurement error was small, and the actual test results showed that the time for a single test was significantly shortened, meeting the requirements for rapid batch testing.

[0037] The system in this application also has: 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 dry distillation environment avoids the interference of coal sample oxidation on the results during low-temperature drying (105-110℃). 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.

[0038] Closed system design: The reactor's sealed structure, combined with the insulation layer design, reduces heat loss and the escape of harmful gases.

[0039] 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 coal moisture dynamic infrared detection system, 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 moisture content of the coal sample to be tested.

2. The coal moisture dynamic infrared detection system 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 coal moisture dynamic infrared detection system according to any one of claims 1-3, 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. The coal moisture dynamic infrared detection system according to claim 4, characterized in that, The material containers are made of copper, steel, or aluminum alloy.

6. The coal moisture dynamic infrared detection system according to any one of claims 1-3, 5, characterized in that, It also includes a controller, a heater, a temperature sensor, an infrared moisture detector, and valves for controlling the gas path, all of which are connected to the controller; the temperature sensor transmits the detected temperature information to the controller, the controller controls the heating of the heater, and controls the opening and closing of the first and second valves that need to cooperate during the detection process of the infrared moisture detector.

7. The coal moisture dynamic infrared detection system according to claim 6, characterized in that, The controller is a microcontroller or a PLC controller.

8. The dynamic infrared detection system for coal moisture according to any one of claims 1-3 and 5, characterized in that, Both the first and second valves are solenoid valves.

9. The coal moisture dynamic infrared detection system according to claim 7, characterized in that, Both the first and second valves are solenoid valves.

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