Coal pile internal temperature and atmosphere measuring device

Abstract

The present invention provides a device for measuring the temperature and atmosphere inside a coal pile. The device of the present invention comprises a measuring rod, a gas sampling unit, a temperature sensor, a gas temperature and humidity detection unit, a gas composition detection unit, and an external connecting rod; one end of the measuring rod is connected to the gas sampling unit, the temperature sensor is suspended inside the measuring rod and does not contact the inner wall of the measuring rod, and is located at one end of the measuring rod connected to the gas sampling unit, the other end of the measuring rod is connected to the gas temperature and humidity detection unit, and the gas temperature and humidity detection unit is connected to the gas composition detection unit through the external connecting rod. The device of the present invention can quickly and accurately measure the internal temperature of a coal pile, and simultaneously detect its internal atmosphere, including O2, CO, temperature, humidity, etc., to provide more abundant information for accurately judging or studying the internal heat loss and spontaneous combustion tendency of a coal pile.

Description

Technical Field

[0001] The invention belongs to the technical field of coal pile safety monitoring and relates to a device for measuring the internal temperature and atmosphere of a coal pile. Background Art

[0002] Coal is the main primary energy source in my country at present and for a long time in the future. Although coal needs to be forced to ignite and burn (rapid oxidation) under high temperature conditions, in fact, coal still has the phenomenon of slow oxidation under normal temperature conditions. The oxidation process is accompanied by heat release. Therefore, during the long-term stacking of coal piles, the internal temperature of the coal pile will gradually increase, and the temperature increase will accelerate the oxidation heat release process. Therefore, during the storage process, coal will suffer heat loss or even spontaneous combustion, causing certain economic losses and even environmental pollution. The slow oxidation rate will vary depending on the reactivity of coal. For coal with poor reactivity, the slow heat release and the natural heat dissipation of the coal pile can generally reach a balance, and no obvious heat loss or spontaneous combustion will occur. For coal with good reactivity, such as high-volatile bituminous coal, especially lignite, the spontaneous combustion of coal piles is very common. Therefore, during the storage and transportation of high-volatile bituminous coal and lignite, how to monitor the heat loss and spontaneous combustion of coal piles is a problem that storage and transportation personnel pay great attention to. Monitoring the internal temperature of a coal pile to determine the heat loss trend of a coal pile or prevent spontaneous combustion is a commonly used method. Most of them use smoke temperature measurement devices to detect the internal temperature of a coal pile online or regularly. At present, various temperature measurement devices with different structures basically have the following shortcomings: (1) Their core structure basically installs the temperature sensor inside the insertion end of the temperature measuring rod (steel pipe) and seals it. The steel pipe has a heat exchange process from the outside to the inside, and the steel pipe itself has good thermal conductivity from one end to the other. Therefore, there are more or less deviations in the rapidity and accuracy of the measurement. (2) The oxidation of coal requires the participation of oxygen, consumes oxygen and produces gases such as CO2 and CO. When the oxygen inside the coal pile is exhausted, even if the temperature is high, it may not continue to deteriorate. Therefore, simply detecting the internal temperature of the coal pile has certain limitations and may even lead to over-processing of the coal pile, forming a new oxidation environment, which in turn increases or even accelerates heat loss. (3) The insertion end generally adopts a pointed structure or an electric drill structure, the purpose of which is to facilitate insertion deep into the coal pile. However, there is still a certain degree of difficulty (the pointed tip will hold up the coal block) or complexity in actual operation. Summary of the invention

[0003] In order to solve the problems described in the background technology, the present invention provides a device for measuring the internal temperature and atmosphere of a coal pile. The purpose of the present invention is to be able to quickly and accurately measure the internal temperature of a coal pile, and simultaneously detect its internal atmosphere, including O2, CO, temperature, humidity, etc., to provide more abundant information for accurately judging or studying the internal heat loss and spontaneous combustion tendency of a coal pile.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] The device for measuring the internal temperature and atmosphere of a coal pile comprises a measuring rod, a gas sampling unit, a temperature sensor, a gas temperature and humidity detection unit, a gas composition detection unit, and an external connecting rod.

[0006] One end of the measuring rod is connected to the gas sampling unit, and the temperature sensor is suspended inside the measuring rod without contacting the inner wall of the measuring rod. It is located at the end of the measuring rod connected to the gas sampling unit, and the other end of the measuring rod is connected to the gas temperature and humidity detection unit. The gas temperature and humidity detection unit is connected to the gas composition detection unit through an external connecting rod.

[0007] The measuring rod is a stainless steel tube, which is convenient for inserting into the deep of coal pile and maintaining good rigidity.

[0008] The stainless steel tube with an outer diameter of 10mm-20mm and a wall thickness of more than 1mm is preferred, and the length of the measuring rod is determined according to the depth of the temperature point to be measured.

[0009] The gas collection unit comprises a steel ball set screw, a cylindrical lengthened nut, a positioning point, and a ventilation groove.

[0010] The steel ball set screw is a standard part and is installed at the end of the insertion end of the measuring device, so as to facilitate the smooth insertion of the measuring device into the coal pile.

[0011] The cylindrical extension nut is a standard part used to install the steel ball set screw. Its internal thread model matches the steel ball set screw. The outer diameter of the cylindrical extension nut is slightly smaller than the outer diameter of the measuring rod and is welded to the end of the measuring rod.

[0012] The positioning points are welding points. 1-2 welding points are spot welded on the inner thread of the cylindrical extension nut at the welding point between the cylindrical extension nut and the measuring rod by electric welding to prevent the steel ball set screw from automatically rotating into the measuring rod when being screwed in or subjected to force.

[0013] The ventilation grooves are open grooves cut along the length direction at the end of the measuring rod, with a number of 2-4, which are used for the gas at the measuring point inside the coal pile to enter the measuring rod, so that the temperature sensor can quickly measure the temperature at the corresponding measuring point, and the gas is derived from the measuring rod to measure the gas composition. The ventilation grooves are 3cm-10cm long and 2mm-4mm wide to prevent coal particles from completely blocking the ventilation grooves and facilitate the removal of coal particles entering the measuring rod.

[0014] The temperature sensor is used to measure the temperature at the measuring point inside the coal pile, and adopts a thermocouple or a thermal resistor. The temperature sensor temperature sensing point is not far from the measuring rod but close to the end of the measuring rod along the length direction of the measuring rod. In order to avoid temperature deviation caused by heat conduction of the steel pipe, the temperature sensing point of the temperature sensor is suspended in the measuring rod and cannot contact the steel pipe wall. A simple method is to tie a knot near the temperature sensing point, and the temperature sensing point is suspended in the middle of the lead knot.

[0015] The gas temperature and humidity detection unit comprises a temperature and humidity sensor, a temperature and humidity wiring, a temperature and humidity cylinder, and a temperature and humidity screw cover.

[0016] The temperature and humidity sensor is used to measure the temperature and humidity of the gas escaping from the inside of the coal pile through the ventilation groove.

[0017] The temperature and humidity wiring is the power supply and signal connection line of the temperature and humidity sensor.

[0018] The temperature and humidity cylinder is a section of stainless steel tube, the inner diameter of which is suitable for installing the temperature and humidity sensor and still having space for gas circulation, and standard parts are used.

[0019] The temperature and humidity screw cover adopts a standard part matching the temperature and humidity cylinder. The present invention adopts a 1-inch stainless steel pipe cap. A hole is opened on one end of the temperature and humidity screw cover and coaxially welded with the measuring rod. The hole diameter matches the inner diameter of the measuring rod. When the temperature and humidity screw cover is connected to the temperature and humidity cylinder, a gasket or raw tape is used for sealing.

[0020] The gas component detection unit comprises a gas component sensor, a gas component wiring, a gas component cylinder, a gas component screw cover, a wiring terminal, a wiring box, a thin nut, and a gas escape hole.

[0021] The gas composition sensor adopts an electrochemical gas sensor. The sensor model and quantity are determined according to the components of the gas to be detected. The present invention adopts O2 and CO sensors.

[0022] The gas composition wiring is the power supply and signal connection line of the gas composition sensor.

[0023] The gas component cylinder is a stainless steel tube, the inner diameter of which is suitable for housing the gas component sensor and still having space for gas circulation. Standard parts can be selected. The present invention uses a 1-inch stainless steel tube with a length of 10 cm.

[0024] The gas component screw cap adopts a standard part matching the gas component cylinder, and the present invention adopts a 1-inch stainless steel pipe cap. When the gas component screw cap is connected to the gas component cylinder, a gasket or raw tape is required for sealing.

[0025] The wiring terminals are used to aggregate the wiring of the temperature sensor, the temperature and humidity sensor, and the gas composition sensor, so as to facilitate connection with the power line and the signal line of the external measuring instrument.

[0026] The junction box is used to install the wiring terminals.

[0027] The thin nut is a standard part, which is used to clamp the junction box and install it on the gas component cylinder. Its model can match the gas component cylinder.

[0028] The gas escape hole is one or more circular holes opened on the junction box, which are used for the natural flow and escape of the gas inside the coal pile.

[0029] The external connecting rod is used to connect the gas temperature and humidity detection unit with the gas composition detection unit, with the purpose of separating the temperature and humidity detection from the gas composition detection. During measurement, the gas temperature and humidity detection unit is inserted into the coal pile to a certain depth to prevent the condensation of the gas escaping from the coal pile. The gas composition detection unit is placed outside the environment, and the escaping high-temperature gas is cooled by the external connecting rod to avoid damage to the gas sensor. The length of the external connecting rod can cool the escaping gas to the temperature that the gas sensor can withstand. The two ends of the external connecting rod are coaxially welded to the temperature and humidity screw cover and the gas composition screw cover, respectively. The two screw covers are respectively opened with holes, and the hole diameters match the inner diameter of the external connecting rod.

[0030] Since there is little gas inside the coal pile, it is not suitable to use an external power source to extract gas. Based on the trapezoidal shape of the coal pile, when measuring the gas composition inside the coal pile, the device of the present invention uses the temperature difference (gas density difference) between the inside and outside of the coal pile to make the internal gas flow outward naturally. When in use, it needs to be inserted vertically or obliquely downward into the coal pile.

[0031] The beneficial effects of the present invention are as follows:

[0032] The device of the present invention can quickly and accurately measure the internal temperature of a coal pile, and simultaneously detect its internal atmosphere, including O2, CO, temperature, humidity, etc., to provide more abundant information for accurately judging or studying the internal heat loss and spontaneous combustion tendency of a coal pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structural principle of the present invention.

[0034] Figure 2 It is a schematic diagram of the insertion end and the gas sampling unit.

[0035] Figure 3 It is a schematic diagram of a gas temperature and humidity detection unit.

[0036] Figure 4 It is a schematic diagram of the gas composition detection unit.

[0037] In the figure: 1. Measuring rod; 2. Insertion end and gas sampling unit; 3. Temperature sensor; 4. Gas temperature and humidity detection unit; 5. Gas composition detection unit; 6. External connecting rod; 2-1. Steel ball set screw; 2-2. Cylindrical extension nut; 2-3. Positioning point; 2-4. Ventilation groove; 4-1. Temperature and humidity sensor; 4-2. Temperature and humidity wiring; 4-3. Temperature and humidity cylinder; 4-4. Temperature and humidity screw cover; 5-1. Gas composition sensor; 5-2. Gas composition wiring; 5-3. Gas composition cylinder; 5-4. Gas composition screw cover; 5-5. Wiring terminal; 5-6. Junction box; 5-7. Thin nut; 5-8. Gas escape hole. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings.

[0039] like Figure 1 As shown, the device for measuring the internal temperature and atmosphere of a coal pile includes a measuring rod 1, a gas sampling unit 2, a temperature sensor 3, a gas temperature and humidity detection unit 4, a gas composition detection unit 5, and an external connecting rod 6.

[0040] The measuring rod 1 is a stainless steel tube. In order to facilitate insertion into the deep of the coal pile and maintain good rigidity, a stainless steel tube with an outer diameter of 10mm-20mm and a wall thickness of more than 1mm is used. The length of the measuring rod 1 is determined according to the depth of the temperature point to be measured. The stainless steel tube used in the application of the present invention is 2m in length, 16mm in outer diameter, and 2mm in wall thickness.

[0041] The gas collection unit 2 comprises a steel ball set screw 2-1, a cylindrical lengthened nut 2-2, a positioning point 2-3, and a ventilation groove 2-4.

[0042] The steel ball set screw 2-1 is a standard part and is installed at the end of the insertion end of the measuring device to facilitate the smooth insertion of the measuring device into the coal pile.

[0043] The cylindrical lengthened nut 2-2 is a standard part, used to install the steel ball set screw 2-1, its inner thread model matches the steel ball set screw 2-1, its outer diameter is slightly smaller than the outer diameter of the measuring rod 1, and is welded to the end of the measuring rod 1.

[0044] The positioning point 2-3 is a welding point. 1-2 welding points are spot welded on the inner thread of the cylindrical extension nut 2-2 where the cylindrical extension nut 2-2 is welded to the measuring rod 1 by electric welding to prevent the steel ball set screw 2-1 from automatically rotating into the measuring rod 1 when being screwed in or subjected to force.

[0045] The ventilation grooves 2-4 are open grooves cut along the length direction at the end of the measuring rod 1, and the number is 2-4, which are used for the gas at the measuring point inside the coal pile to enter the measuring rod 1. The ventilation grooves are 3cm-10cm long and 2mm-4mm wide to prevent coal particles from completely blocking the ventilation grooves 2-4 and facilitate the removal of coal particles entering the measuring rod 1.

[0046] The temperature sensor 3 is used to measure the temperature at the measuring point inside the coal pile, and adopts a thermocouple or a thermal resistor. The temperature sensing point of the temperature sensor 3 is not near the end of the measuring rod 1 along the length direction of the measuring rod. In order to avoid temperature deviation caused by heat conduction of the steel pipe, the temperature sensing point of the temperature sensor 3 is suspended in the measuring rod 1 and cannot contact the steel pipe wall. A simple method is to tie a knot near the temperature sensing point, and the temperature sensing point is suspended in the middle of the lead knot.

[0047] The gas temperature and humidity detection unit 4 comprises a temperature and humidity sensor 4-1, a temperature and humidity connection 4-2, a temperature and humidity cylinder 4-3, and a temperature and humidity screw cover 4-4.

[0048] The temperature and humidity sensor 4-1 is used to measure the temperature and humidity of the gas escaping from the inside of the coal pile through the ventilation grooves.

[0049] The temperature and humidity connection 4-2 is a power supply and signal connection line of the temperature and humidity sensor 4-1.

[0050] The temperature and humidity cylinder 4-3 is a section of stainless steel tube, the inner diameter of which is suitable for housing the temperature and humidity sensor 4-1 and still having space for gas circulation. Standard parts can be selected. The present invention uses a 1-inch external thread stainless steel tube with a length of 5 cm.

[0051] The temperature and humidity screw cover 4-4 is a standard part that matches the temperature and humidity cylinder. A 1-inch stainless steel pipe cap is used in the application of the present invention. A hole is opened on one end of the temperature and humidity screw cover 4-4 and coaxially welded with the measuring rod 1. The hole diameter matches the inner diameter of the measuring rod 1. When the temperature and humidity screw cover 4-4 is connected to the temperature and humidity cylinder 4-3, a gasket or raw tape needs to be used for sealing.

[0052] The gas component detection unit 5 includes a gas component sensor 5-1, a gas component wiring 5-2, a gas component cylinder 5-3, a gas component screw cover 5-4, a wiring terminal 5-5, a wiring box 5-6, a thin nut 5-7, and a gas escape hole 5-8.

[0053] The gas composition sensor 5-1 may generally be an electrochemical gas sensor, and the sensor model and quantity are determined according to the components of the gas to be detected. For example, in the application of the present invention, O2 and CO sensors are installed.

[0054] The gas composition connection 5-2 is a power supply and signal connection line of the gas composition sensor 5-1.

[0055] The gas composition cylinder 5-3 is a section of stainless steel tube, the inner diameter of which is suitable for housing the gas composition sensor 5-1 and still having space for gas circulation. Standard parts can be selected, such as a 1-inch stainless steel tube with a length of 10 cm used in the application of the present invention.

[0056] The gas component screw cap 5-4 is a standard part matching the gas component cylinder 5-3, and a 1-inch stainless steel pipe cap is used in the application of the present invention. When the gas component screw cap 5-4 is connected to the gas component cylinder 5-3, a gasket or raw tape is required for sealing.

[0057] The wiring terminal 5-5 is used to aggregate the wiring of the temperature sensor 3, the temperature and humidity sensor 4-1, and the gas composition sensor 5-1, so as to facilitate connection with the power line and signal line of the external measuring instrument.

[0058] The junction box 5-6 is used to install the connection terminal 5-5.

[0059] The thin nut 5-7 is a standard part, which is used to clamp the junction box 5-6 and install it on the gas component cylinder 5-3. Its model can match the gas component cylinder 5-3.

[0060] The gas escape hole 5-8 is one or more circular holes opened on the junction box 5-6, which are used for the natural flow and escape of the gas inside the coal pile.

[0061] The external connecting rod 6 is used to connect the gas temperature and humidity detection unit 4 and the gas composition detection unit 5, with the purpose of separating the temperature and humidity detection from the gas composition detection. During measurement, the gas temperature and humidity detection unit 4 is inserted into the coal pile to a certain depth to prevent the condensation of the gas escaping from the coal pile. The gas composition detection unit 5 is placed outside the environment, and the escaping high-temperature gas is cooled by the external connecting rod 6 to avoid damage to the gas sensor 5-1. The length of the external connecting rod 6 can cool the escaping gas to the temperature that the gas sensor 5-1 can withstand. In the application of the present invention, a stainless steel pipe with a length of 30 cm, an outer diameter of 16 mm, and a wall thickness of 2 mm is used. The two ends of the external connecting rod 6 are coaxially welded with the temperature and humidity screw cover 4-4 and the gas composition screw cover 5-4, respectively. The two screw covers are respectively opened with holes, and the hole diameter matches the inner diameter of the external connecting rod 6.

[0062] Since there is little gas inside the coal pile, it is not suitable to use an external power source to extract gas. Based on the trapezoidal shape of the coal pile, when measuring the gas composition inside the coal pile, the device of the present invention uses the temperature difference (gas density difference) between the inside and outside of the coal pile to make the internal gas flow outward naturally. When in use, it needs to be inserted vertically or obliquely downward into the coal pile.

Claims

1. A device for measuring the internal temperature and atmosphere of a coal pile, characterized in that: It includes a measuring rod, a gas sampling unit, a temperature sensor, a gas temperature and humidity detection unit, a gas composition detection unit, and an external connecting rod; One end of the measuring rod is connected to the gas sampling unit, the temperature sensor is suspended inside the measuring rod and does not contact the inner wall of the measuring rod. It is located at the end of the measuring rod connected to the gas sampling unit, and the other end of the measuring rod is connected to the gas temperature and humidity detection unit. The gas temperature and humidity detection unit is connected to the gas composition detection unit through an external connecting rod; The gas collection unit comprises a steel ball set screw, a cylindrical lengthened nut, a positioning point, and a venting groove; The steel ball set screw is a standard part, which is installed at the end of the insertion end of the measuring device, so as to facilitate the smooth insertion of the measuring device into the coal pile; The cylindrical extension nut is a standard part, used to install the steel ball set screw, and its internal thread type matches the steel ball set screw. The outer diameter of the cylindrical extension nut is slightly smaller than the outer diameter of the measuring rod, and is welded to the end of the measuring rod; The positioning point is a welding point. One to two welding points are spot welded by electric welding on the inner thread of the cylindrical extension nut where the cylindrical extension nut and the measuring rod are welded, so as to prevent the steel ball set screw from automatically rotating into the measuring rod when being screwed in or subjected to force. The ventilation grooves are open grooves cut along the length direction at the end of the measuring rod, and the number is 2-4, which are used for the gas at the measuring point inside the coal pile to enter the measuring rod; the ventilation grooves are 3cm-10cm long and 2mm-4mm wide to avoid coal particles completely blocking the ventilation grooves and facilitate the removal of coal particles entering the measuring rod; The temperature sensor is used to measure the temperature at the measuring point inside the coal pile, and adopts a thermocouple or a thermal resistor; the temperature sensing point of the temperature sensor is not along the length direction of the measuring rod but close to the end of the measuring rod; in order to avoid temperature deviation caused by heat conduction of the steel pipe, the temperature sensing point of the temperature sensor is suspended in the measuring rod and cannot contact the steel pipe wall; The gas temperature and humidity detection unit comprises a temperature and humidity sensor, a temperature and humidity wiring, a temperature and humidity cylinder, and a temperature and humidity screw cover; The temperature and humidity sensor is used to measure the temperature and humidity of the gas escaping from the inside of the coal pile through the ventilation groove; The temperature and humidity wiring is the power supply and signal connection line of the temperature and humidity sensor; The temperature and humidity cylinder is a section of stainless steel tube, the inner diameter of which can accommodate the temperature and humidity sensor and still have space for gas circulation, and is a standard part; The temperature and humidity screw cover is a standard part that matches the temperature and humidity cylinder; a hole is opened on one end of the temperature and humidity screw cover and is coaxially welded to the measuring rod, and the hole diameter matches the inner diameter of the measuring rod; a gasket or raw tape is used to seal the temperature and humidity screw cover and the temperature and humidity cylinder; The gas component detection unit includes a gas component sensor, a gas component wiring, a gas component cylinder, a gas component screw cover, a wiring terminal, a wiring box, a thin nut, and a gas escape hole; The gas composition sensor adopts an electrochemical gas sensor, and the sensor model and quantity are determined according to the components of the gas to be detected; The gas composition wiring is the power supply and signal connection line of the gas composition sensor; The gas composition cylinder is a section of stainless steel tube, the inner diameter of which can accommodate the gas composition sensor and still have space for gas circulation, and standard parts are selected; The gas component screw cap is a standard part that matches the gas component cylinder. When the gas component screw cap is connected to the gas component cylinder, a gasket or raw tape is used for sealing. The wiring terminals are used to aggregate the wiring of the temperature sensor, the temperature and humidity sensor, and the gas composition sensor, so as to facilitate connection with the power line and signal line of the external measuring instrument; The junction box is used to install the wiring terminals; The thin nut is a standard part, used to clamp the junction box and install it on the gas component cylinder. Its model can match the gas component cylinder. The gas escape hole is one or more circular holes opened on the junction box, which are used for the natural flow and escape of the gas inside the coal pile; The external connecting rod is used to connect the gas temperature and humidity detection unit with the gas composition detection unit, and separate the temperature and humidity detection from the gas composition detection. During measurement, the gas temperature and humidity detection unit is inserted into the coal pile to a certain depth to avoid condensation of the gas escaping from the coal pile. The gas composition detection unit is placed outside the environment, and the escaping high-temperature gas is cooled by the external connecting rod. The length of the external connecting rod can cool the escaping gas to the tolerable temperature of the gas sensor. The two ends of the external connecting rod are coaxially welded to the temperature and humidity screw cover and the gas composition screw cover, respectively. The two screw covers are respectively opened with holes, and the hole diameters match the inner diameter of the external connecting rod.

2. The device for measuring the internal temperature and atmosphere of a coal pile according to claim 1, characterized in that: The measuring rod is a stainless steel tube with an outer diameter of 10mm-20mm and a wall thickness of more than 1mm. The length of the measuring rod is determined according to the depth of the temperature point to be measured.

3. The device for measuring the internal temperature and atmosphere of a coal pile according to claim 2, characterized in that: The measuring rod is a stainless steel tube with a length of 2m, an outer diameter of 16mm and a wall thickness of 2mm.

4. The device for measuring the internal temperature and atmosphere of a coal pile according to claim 1, characterized in that: The temperature and humidity cylinder body adopts a 1-inch stainless steel tube with a length of 5 cm, and the temperature and humidity screw cover adopts a 1-inch stainless steel pipe cap.

5. The device for measuring the internal temperature and atmosphere of a coal pile according to claim 4, characterized in that: The gas composition sensor adopts O2 and CO sensors, the gas composition cylinder adopts a 1-inch stainless steel tube with a length of 10 cm, and the gas composition screw cover adopts a 1-inch stainless steel pipe cap.

6. The device for measuring the internal temperature and atmosphere of a coal pile according to claim 1, characterized in that: The outer connecting rod is a stainless steel tube with a length of 30 cm, an outer diameter of 16 mm and a wall thickness of 2 mm.

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