Coal spontaneous combustion oxidation temperature programming device and method based on real-time monitoring of sensor

Abstract

The invention provides a coal spontaneous combustion oxidation programmed heating device and method based on real-time monitoring of a sensor, gas outlet pipes of an air source and a nitrogen source are respectively connected with a multi-joint gas mixing bag, the multi-joint gas mixing bag is communicated into a reaction chamber of a programmed heating furnace through a gas supply pipeline, the gas supply pipeline is also provided with a flowmeter, a coal sample tank is arranged in the reaction chamber, and the coal sample tank is connected with the gas source. One end of a gas source outlet gas pipe of the reaction chamber extends to the coal sample tank, the other end of the gas source outlet gas pipe is led out of the reaction chamber, a valve and a gas sensor are arranged on the gas source outlet gas pipe outside the reaction chamber, and a drying pipe is additionally arranged on the gas source outlet gas pipe between the gas sensor and the reaction chamber. The problems that a traditional method is high in cost, large in occupied area, long in consumed time and the like are solved. Belongs to the technical field of coal spontaneous combustion experiments.

Description

Technical Field

[0001] The invention relates to a coal spontaneous combustion oxidation programmed temperature raising device and method based on real-time monitoring by a sensor, belonging to the technical field of coal spontaneous combustion experiments. Background Art

[0002] Based on the resource characteristics of my country, which is rich in coal, poor in oil and little in gas, the large-scale mining and use of coal is an inevitable trend. However, with the increase in coal mining, coal mine accidents are also frequent. Among them, internal fires caused by coal spontaneous combustion will not only cause waste of resources, but also endanger production safety and cause air pollution. During the spontaneous combustion of coal, a large amount of toxic and harmful gases are often produced, which pose a fatal threat to underground workers. Therefore, studying the gases produced during the spontaneous combustion of coal and their concentration changes is of vital importance to protecting the life and health of underground workers and the safe development of the coal industry.

[0003] At present, the method of measuring coal spontaneous combustion and oxidation by programmed temperature rise combined with gas chromatograph is mature and has the characteristics of high sensitivity and low false alarm rate. However, it is costly and occupies a large area, and it takes a long time to wait for peak judgment. Based on this, a new improvement method is proposed for the coal spontaneous combustion programmed temperature rise device, which has high gas measurement efficiency, saves costs, and can provide the effect of coal spontaneous combustion and oxidation under different oxygen conditions. Summary of the invention

[0004] The present invention provides a device and method for programmed temperature rise of spontaneous combustion oxidation of coal based on real-time monitoring by sensors, so as to solve the problems of high cost, large floor space and long time consumption of traditional methods.

[0005] In order to solve the above problems, it is planned to adopt a coal spontaneous combustion oxidation programmed temperature rising device based on real-time monitoring by sensors. The outlet pipes of the air source and the nitrogen source are respectively connected to the multi-joint mixing bags, and the multi-joint mixing bags are connected to the reaction chamber of the programmed temperature rising furnace through the gas supply pipeline. A flow meter is also provided on the gas supply pipeline. The coal sample tank is placed in the reaction chamber. One end of the gas source outlet pipe of the reaction chamber extends to the coal sample tank, and the other end is led out to the outside of the reaction chamber. A valve and a gas sensor are provided on the gas source outlet pipe outside the reaction chamber, and a drying tube is also installed on the gas source outlet pipe between the gas sensor and the reaction chamber.

[0006] In the aforementioned device, a temperature sensor is also correspondingly arranged at the coal sample tank, and the detection end of the temperature sensor extends to the reaction zone in the coal sample tank.

[0007] The aforementioned device also includes a computer terminal, and the temperature sensor and the gas sensor are respectively connected to the computer terminal for uploading the detection data of the sensors to the computer terminal.

[0008] In the aforementioned device, each joint of the multi-joint mixed air bag has a separate switch valve, which can be closed when not in use without affecting the normal use of the air bag. A gas sensor is provided inside to reflect the proportion of gas components in the bag in real time, and is mainly used to configure different oxidizing atmospheres for experiments.

[0009] In the aforementioned device, the gas supply pipeline and the gas source outlet gas pipe are both made of high temperature resistant materials, and the gas supply pipeline and the gas source outlet gas pipe both penetrate the outer wall of the reaction chamber, and are sealed with the outer wall of the reaction chamber by high temperature resistant materials;

[0010] The method for using the above-mentioned coal spontaneous combustion oxidation programmed temperature rising device based on real-time monitoring by sensors specifically comprises the following steps:

[0011] Step 1: Check the tightness of the system to ensure that all experimental equipment can be used normally;

[0012] Step 2: Take out the coal sample tank, put in the required amount of coal sample for the experiment and place it in the reaction chamber of the programmed temperature furnace;

[0013] Step 3: Turn on the nitrogen source, fill the device with nitrogen, use a flow meter to detect the flow, and control the flow through a valve on the nitrogen source;

[0014] Step 4: Control the program heating furnace to start preheating, start the sensor, and collect data in real time;

[0015] Step 5, open the dry air source, introduce dry air into the device, use a flow meter to detect the flow rate, and provide corresponding oxygen for low-temperature oxidation of the coal sample;

[0016] Step 6, setting the heating rate of the programmed heating furnace, starting the programmed heating furnace, starting to heat the coal sample in the reaction chamber and starting timing;

[0017] Step 7. After the experiment starts, open the corresponding valve. The gas in the coal sample tank will flow out through the gas source outlet pipe due to the gas pressure. The outflowing gas will be dried by the drying tube and then pass through the gas sensor. The gas sensor detects the gas concentration of the gas flow in real time and uploads the data. Check the detection data uploaded by the temperature sensor and the gas sensor in real time, that is, check the gas concentration data at the corresponding temperature in real time.

[0018] Step 8: When the temperature of the programmed temperature furnace reaches the set temperature, the experiment is ended, the dry air source is turned off, and the programmed temperature furnace is allowed to cool down;

[0019] Step nine, after the programmed temperature furnace is cooled, the nitrogen source is turned off, the coal sample tank is taken out, and the oxidized coal sample is processed;

[0020] Step 10. Save and export data on the computer.

[0021] In the above-mentioned usage method, when it is necessary to change the oxygen content and then conduct a programmed temperature rise experiment on coal spontaneous combustion, first connect the required gas source to the multi-joint mixing bag, then adjust the gas supply flow of the required gas source, and then conduct the experiment according to the above-mentioned experimental steps. When performing step five, the gas source required for the experiment is turned on, and the experiment is carried out according to the required proportion of the experiment. The proportion information is viewed in real time through the gas sensor in the multi-joint mixing bag.

[0022] Compared with the prior art, the present invention changes the gas cylinder for gas distribution, combines temperature and gas sensors, and converts various parameter signals to be measured in the low-temperature oxidation of coal and different oxidizing atmosphere processes into electrical signals, which are transmitted to the computer side, thereby realizing the monitoring of the concentration of index gas of low-temperature oxidation of coal. Compared with the prior art, the research device has a simple structure, low cost, and is easy to use. It can conveniently configure various oxidizing atmospheres for experiments, and combined with the real-time signal transmission of the sensor, it can more efficiently and quickly determine the concentration of the characteristic gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the research device of the present invention;

[0024] Figure 2 is a simplified diagram of the sensor involved in the device of the present invention;

[0025] Figure 3 Principle block diagram of coal spontaneous combustion programmed temperature heating device.

[0026] In the figure: 1. Dry air source; 2. Nitrogen source; 3. Multi-connector mixing bag; 4. External gas source hole; 5. Flow meter; 6. Programmed temperature furnace; 7. Heating wire; 8. Reaction chamber; 9. Coal sample tank; 10. Temperature sensor; 11. Drying tube; 12. Wireless network; 13. Gas sensor; 14. Computer; 15. Inside of sensor; 16. Valve; 17. Gas supply pipeline. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] Example

[0029] See attached Figure 1 To Attachment Figure 3This embodiment provides a method for heating the spontaneous combustion and oxidation program of coal based on real-time monitoring by sensors. The method first prepares a corresponding spontaneous combustion and oxidation program heating device for coal, which specifically includes: the outlet pipes of the air source 1 and the nitrogen source 2 are respectively connected to the multi-joint mixed air bag 3, each joint of the multi-joint mixed air bag 3 has a separate switch valve, which can be closed when not in use without affecting the normal use of the air bag, and a gas sensor 13 is arranged inside to reflect the proportion of gas components in the bag in real time, which is mainly used to configure different oxidation atmospheres for experiments.

[0030] The multi-joint mixing air bag 3 is connected to the reaction chamber 8 of the programmed temperature furnace 6 through an air supply pipeline 17, and a flow meter 5 is also provided on the air supply pipeline 17. The coal sample tank 9 is placed in the reaction chamber 8, and a temperature sensor 10 is correspondingly provided at the coal sample tank 9. The detection end of the temperature sensor 10 extends to the reaction zone in the coal sample tank 9. One end of the gas source outlet pipe of the reaction chamber 8 extends to the coal sample tank 9, and the other end is led out of the reaction chamber 8, and a valve 16 and a gas sensor 13 are provided on the gas source outlet pipe outside the reaction chamber 8. A drying tube 11 is also installed on the gas source outlet pipe between the gas sensor 13 and the reaction chamber 8. The temperature sensor 10 and the gas sensor 13 are respectively connected to the computer terminal 14 for uploading the detection data of the sensor to the computer terminal 14.

[0031] The gas supply pipeline 17 and the gas source outlet pipe are both made of high-temperature resistant materials, such as high-temperature resistant alloy pipes, and the gas supply pipeline 17 and the gas source outlet pipe both penetrate the outer wall of the reaction chamber 8, and are sealed with the outer wall of the reaction chamber 8 by high-temperature resistant materials. The high-temperature resistant material used for sealing can be the filling material disclosed in the invention patent named "Filling material for gaps in insulation materials, preparation method and application thereof".

[0032] The method for programmed heating of coal spontaneous combustion oxidation specifically comprises the following steps:

[0033] Step 1: Check the tightness of the system to ensure that all experimental equipment can be used normally;

[0034] Step 2: Take out the coal sample tank 9, put in the required amount of coal sample for the experiment and place it in the reaction chamber 8 of the programmed temperature furnace 6;

[0035] Step 3, open the corresponding valve 16, turn on the nitrogen source 2, fill the device with nitrogen, detect the flow rate with the flow meter 5, and control the flow rate through the valve on the nitrogen source 2;

[0036] Step 4, control the program heating furnace 6 to start preheating, start the sensor, and collect data in real time;

[0037] Step 5, open the dry air source 1, introduce dry air into the device, use the flow meter 5 to detect the flow rate, and provide corresponding oxygen for the low-temperature oxidation of the coal sample;

[0038] Step 6, setting the heating rate of the programmed heating furnace 6, starting the programmed heating furnace 6, starting to heat the coal sample in the reaction chamber 8 and starting timing;

[0039] Step 7, after the experiment starts, open the corresponding valve 16, the gas at the coal sample tank 9 will flow out through the gas source outlet pipe due to the gas pressure, the outflowing gas will be dried by the drying tube 11 and then pass through the gas sensor 13, the gas sensor 13 detects the gas concentration of the gas flow in real time and uploads the data, and checks the detection data uploaded by the temperature sensor 10 and the gas sensor 13 in real time, that is, checks the gas concentration data at the corresponding temperature in real time;

[0040] Step 8, when the temperature of the programmed temperature-raising furnace 6 reaches the set temperature, the experiment is ended, the dry air source 1 is turned off, and the programmed temperature-raising furnace 6 is waited for to cool down;

[0041] Step nine, after the programmed temperature furnace 6 is cooled, the nitrogen source 2 is turned off, the coal sample tank 9 is taken out, and the oxidized coal sample is processed;

[0042] Step ten, the computer 14 saves the data and exports the data.

[0043] When it is necessary to change the oxygen content and conduct a programmed temperature rise experiment on coal spontaneous combustion, first connect the required gas source to the multi-joint mixing bag, then adjust the gas supply flow of the required gas source, and then conduct the experiment according to the above experimental steps. When performing step five, the gas source required for the experiment is opened, and the experiment is carried out according to the required proportion of the experiment. The proportion information is viewed in real time through the gas sensor 13 in the multi-joint mixing bag 3.

[0044] Obviously, the above-mentioned embodiments and comparative examples are only a part of the present invention, rather than all examples. The preferred embodiments of the present invention disclosed above are only used to help explain the present invention, without describing all the details in detail. According to the content of this specification, more modifications and changes can be made. Based on the embodiments and comparative examples in the present invention, all other embodiments and various modifications or supplements obtained by ordinary technicians in the field without making creative work, as long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, belong to the scope of protection of the present invention.

[0045] In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiments and comparative examples. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments in a suitable manner.

Claims

1. A coal spontaneous combustion oxidation programmed temperature rising device based on real-time monitoring by sensors, wherein the outlet pipes of an air source (1) and a nitrogen source (2) are respectively connected to a multi-joint gas mixing bag (3), and the multi-joint gas mixing bag (3) is connected to a reaction chamber (8) of a programmed temperature rising furnace (6) through a gas supply pipeline (15). A flow meter (5) is also provided on the gas supply pipeline (15). A coal sample tank (9) is placed in the reaction chamber (8), and one end of the gas source outlet gas pipe of the reaction chamber (8) extends to the coal sample tank (9), and the other end is led out of the reaction chamber (8). A valve (16) and a gas sensor (13) are provided on the gas source outlet gas pipe outside the reaction chamber (8), and a drying tube (11) is also installed on the gas source outlet gas pipe between the gas sensor (13) and the reaction chamber (8).

2. According to claim 1, the device for programmed temperature rise of coal spontaneous combustion oxidation based on real-time monitoring by sensors is characterized in that: A temperature sensor (10) is also provided corresponding to the coal sample tank (9), and a detection end of the temperature sensor (10) extends to the reaction zone in the coal sample tank (9).

3. According to claim 2, the device for programmed temperature rise of coal spontaneous combustion oxidation based on real-time monitoring by sensors is characterized in that: It also includes a computer terminal (14), and the temperature sensor (10) and the gas sensor (13) are respectively connected to the computer terminal (14) for uploading the detection data of the sensors to the computer terminal (14).

4. According to claim 1, the device for programmed temperature rise of coal spontaneous combustion oxidation based on real-time monitoring by sensors is characterized in that: Each joint of the multi-joint gas mixing bag (3) has a separate switch valve. A gas sensor (13) is arranged inside the multi-joint gas mixing bag (3) to detect the proportion of gas components in the bag in real time, and is mainly used to configure different oxidizing atmospheres for experiments.

5. The device for programmed temperature rise of coal spontaneous combustion oxidation based on real-time monitoring by sensors according to claim 1 is characterized in that: The gas supply pipeline (17) and the gas source outlet pipe are both made of high temperature resistant materials, and the gas supply pipeline (17) and the gas source outlet pipe both penetrate the outer wall of the reaction chamber (8), and are sealed with the outer wall of the reaction chamber (8) by means of high temperature resistant materials.

6. The method for using the coal spontaneous combustion oxidation programmed temperature rising device based on real-time monitoring by sensors according to any one of claims 1 to 5, characterized in that: The specific steps are as follows: Step 1: Check the tightness of the system to ensure that all experimental equipment can be used normally; Step 2: Take out the coal sample tank (9), load it with the amount of coal sample required for the experiment and place it in the reaction chamber (8) of the programmed temperature furnace (6); Step 3, turning on the nitrogen source (2), filling the device with nitrogen, using a flow meter (5) to detect the flow rate, and controlling the flow rate through a valve on the nitrogen source (2); Step 4, controlling the programmed heating furnace (6) to start preheating, starting the sensor, and collecting data in real time; Step 5, open the dry air source (1), introduce dry air into the device, use a flow meter (5) to detect the flow rate, and provide corresponding oxygen for low-temperature oxidation of the coal sample; Step 6, setting the heating rate of the programmed heating furnace (6), starting the programmed heating furnace (6), starting to heat the coal sample in the reaction chamber (8) and starting the timing; Step 7, after the experiment starts, the corresponding valve (16) is opened, and the gas in the coal sample tank (9) will flow out through the gas source outlet pipe due to the gas pressure. The outflowing gas is dried by the drying tube (11) and then passes through the gas sensor (13). The gas sensor (13) detects the gas concentration of the gas flow in real time and uploads the data. The detection data uploaded by the temperature sensor (10) and the gas sensor (13) are checked in real time, that is, the gas concentration data at the corresponding temperature is checked in real time; Step 8, when the temperature of the programmed temperature-raising furnace (6) reaches the set temperature, the experiment is ended, the dry air source (1) is turned off, and the programmed temperature-raising furnace (6) is waited for to cool down; Step nine, after the programmed temperature furnace (6) cools down, the nitrogen source (2) is turned off, the coal sample tank (9) is taken out, and the oxidized coal sample is processed; Step 10, the computer (14) saves the data and exports the data.

7. The method of use according to claim 6, characterized in that: When it is necessary to change the oxygen content and conduct a programmed temperature rise experiment on coal spontaneous combustion, first connect the required gas source to the multi-joint mixing bag, then adjust the gas supply flow of the required gas source, and then conduct the experiment according to the above experimental steps. When performing step five, the gas source required for the experiment is turned on, and the experiment is carried out according to the required ratio of the experiment. The ratio information is checked in real time through the gas sensor (13) in the multi-joint mixing bag (3).

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