A filling material room temperature oxidation gas detection device with gas compensation

Abstract

The present invention provides a gas detection device for room-temperature oxidation of filling materials with gas compensation, which belongs to the technical field of gas detection; the gas detection device for room-temperature oxidation of filling materials with gas compensation can realize gas concentration monitoring during room-temperature oxidation of filling materials in goafs, and corrects chemical gas sensor detection data by obtaining interference coefficients between different reducing gases, thereby obtaining the true concentration of the reaction gas; the device can realize real-time display of filling material reaction gas concentration parameters, temperature parameters and pressure parameters, and intuitively reflect the detection values ​​and change trends of each reaction gas concentration, reaction temperature and cavity pressure during room-temperature oxidation.

Description

Technical Field

[0001] The invention belongs to the technical field of gas detection, and in particular relates to a normal-temperature oxidation gas detection device of a filling material containing gas compensation. Background Art

[0002] At present, the "Coal Mine Safety Regulations" stipulate that the maximum allowable CO concentration in coal mines is 24ppm. In order to meet the requirements of intrinsically safe equipment, electrochemical sensors are used to detect gases in mines. However, in actual applications, it is found that the strong oxidizing electrolyte contained in the electrochemical sensor is not targeted, and the filling materials in the goaf will produce certain non-CO reducing gases under the influence of physical and chemical reactions and the environment, which interferes with the detection of underground CO electrochemical sensors, causing false alarms of the sensors many times, seriously affecting the normal production of the mine. In order to solve the above problems, it is necessary to develop a normal temperature gas detection device that can realize real-time monitoring of the concentration of normal temperature oxidizing gas in the filling material. Summary of the invention

[0003] In view of the shortcomings in the prior art, the present invention provides a gas detection device for room-temperature oxidation of filling materials with gas compensation; the gas detection device for room-temperature oxidation of filling materials with gas compensation can realize gas concentration monitoring during room-temperature oxidation of filling materials in goafs, and correct the detection data of chemical gas sensors by obtaining the interference coefficients between different reducing gases, so as to obtain the true concentration of the reaction gas; the device can also realize real-time display of temperature parameters of filling materials and pressure parameters of reaction gases, and intuitively reflect the changing trends of numerical values ​​such as concentration of each reaction gas, reaction temperature and cavity pressure during room-temperature oxidation.

[0004] The present invention provides a filling material room temperature oxidation gas detection device containing gas compensation, comprising a reaction system, a gas detection system and a data processing system;

[0005] The reaction system comprises a room temperature oxidation reaction chamber, and a thermocouple temperature sensor is inserted into the room temperature oxidation reaction chamber;

[0006] The gas detection system comprises a gas detection cavity, which is a hollow cavity. At least one reaction gas sensor and an oxygen sensor are arranged on the cavity wall of the gas detection cavity. The reaction gas sensor and the oxygen sensor are screwed into the cavity wall of the gas detection cavity through threaded connection. The gas detection cavity is connected to the room-temperature oxidation reaction cavity through a flange, and the gas freely diffuses from the room-temperature oxidation reaction cavity through the flange ring to the gas detection cavity.

[0007] The data processing system includes a data processing box and a computer terminal. The data processing box is connected to a thermocouple temperature sensor, a reaction gas sensor and an oxygen sensor respectively through a data transmission line to collect and process data such as reaction temperature, gas concentration, and cavity pressure. The data processing box is also connected to a computer terminal through a data transmission line to store the reaction temperature, gas concentration, and cavity pressure during the room-temperature oxidation process of the filling material, and to draw change curves of various numerical values ​​for real-time display.

[0008] Preferably, the thermocouple temperature sensor is vertically inserted from the side of the room temperature oxidation reaction chamber.

[0009] Preferably, the insertion length of the thermocouple temperature sensor is 1 / 2 of the diameter of the room temperature oxidation reaction chamber.

[0010] Preferably, a pressure detection gauge is provided on the top of the outside of the gas detection cavity, and the pressure detection gauge is connected to the data processing box via a data transmission line.

[0011] Preferably, the reaction gas sensor and the oxygen sensor are distributed on the side wall of the gas detection cavity.

[0012] Preferably, the reaction gas sensor comprises a reducing gas species sensor and a non-reducing reaction gas sensor;

[0013] When used for detecting reducing reaction gases, the reaction gas sensor includes sensors for all reducing gas species that can be produced by the filling material;

[0014] When used for detecting non-reducing reaction gases, the reaction gas sensor selects a corresponding gas sensor according to the type of the detected gas and is installed separately.

[0015] The present invention also provides a method for using the above-mentioned filling material room temperature oxidation gas detection device containing gas compensation, comprising:

[0016] Filling materials are added to the room-temperature oxidation reaction chamber and the gas detection chamber is connected through a flange. The gas generated by the reaction freely diffuses from the room-temperature oxidation reaction chamber through the hollow part of the flange to the gas detection chamber. Then, the reaction gas sensor and the oxygen sensor are used to monitor the gas concentration, and the pressure detection gauge monitors the real-time pressure of the gas detection chamber. Then, a data processing box is used to collect and summarize the data of the thermocouple temperature sensor, the reaction gas sensor, the oxygen sensor and the pressure detection gauge, and transmit them to a computer terminal. The computer terminal stores the data of the reaction temperature, gas concentration and cavity pressure during the room-temperature oxidation of the filling material, and draws the change curves of various values ​​for real-time display.

[0017] Preferably, the total volume of the filling material does not exceed 4 / 5 of the volume of the room temperature oxidation reaction chamber.

[0018] Preferably, when the detected gas is a reducing gas, the data processing box corrects the accurate concentration of the gas produced by room temperature oxidation to obtain the real concentration of the reducing gas, and then transmits the real concentration of the reducing gas to the computer terminal.

[0019] Preferably, the correction step is: solving a formula using interference parameters between mixed gases and the concentration of the mixed gas detected by the corresponding reaction gas sensor;

[0020] The formula is: Among them, c j is the actual concentration of various reducing gases j, q ij is the interference coefficient of reducing gas j on the detection channel of the electrochemical sensor of gas i, C j is the instrument detection value of the detection channel of the electrochemical sensor of gas j, and j is a positive integer.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] In the present invention, a thermocouple temperature sensor probe is arranged in the room temperature oxidation reaction chamber to monitor the reaction temperature inside the oxidation reactant in real time; a pressure detection gauge is arranged in the gas detection chamber to monitor the pressure inside the device cavity in real time; and the detection data is compensated for temperature and pressure through the gas state equation through a data processing box.

[0023] In the present invention, an oxygen concentration sensor and chemical sensors for various reducing gases such as CO and H2 and sensors for detecting non-reducing gases such as CH4 and CO2 are arranged in the gas detection cavity to monitor the oxygen concentration and various reaction gases in the cavity of the device. The data processing box corrects the concentration of reducing gases such as CO and H2 detected by the sensor according to the interference coefficient between the reducing gases, eliminates the interference effect of other reducing gases on the detection channel of the chemical sensor, and then obtains the true concentration of various reducing gases.

[0024] The computer terminal of the present invention can store the temperature parameters of the filling material inside the room temperature oxidation reaction chamber, the pressure parameters of the reaction gas and the gas concentration value, and display them in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of a room temperature oxidation reaction gas detection device with gas compensation according to the present invention.

[0026] Figure 2 This is a distribution diagram of the reactive gas chemical sensor in the gas concentration detection module domain of the present invention.

[0027] Figure 3It is a cross-sectional view of the oxidation reaction area of ​​the present invention.

[0028] Reference numerals:

[0029] 1- oxidation reaction chamber; 2- thermocouple temperature sensor; 3- gas detection chamber; 4- reaction gas sensor; 5- oxygen sensor; 6- pressure detection gauge; 7- flange; 8- data transmission line; 9- data processing box; 10- computer terminal. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0031] Embodiment 1:

[0032] like Figures 1 to 3 As shown, the gas detection device for normal temperature oxidation of filling materials with gas compensation in the present invention comprises a reaction system, a gas detection system and a data processing system. The reaction system comprises a normal temperature oxidation reaction chamber 1, and a thermocouple temperature sensor 2 is inserted into the normal temperature oxidation reaction chamber 1. During the implementation process, the thermocouple temperature sensor 2 is vertically inserted from the side of the normal temperature oxidation reaction chamber 1, and the insertion length of the thermocouple temperature sensor 2 is 1 / 2 of the diameter of the normal temperature oxidation reaction chamber 1, so as to monitor the reaction temperature of the filling material in the normal temperature oxidation reaction chamber 1 during oxidation.

[0033] The gas detection system includes a gas detection cavity 3, which is connected to the room temperature oxidation reaction cavity 1 through a flange 7, and the gas freely diffuses from the room temperature oxidation reaction cavity 1 to the gas detection cavity 3 through the flange 7 ring. The gas detection cavity 3 is a cavity that can accumulate various gases inside the cavity when the filling material is oxidized at room temperature. At least one reaction gas sensor 4 and an oxygen sensor 5 are provided at the cavity wall of the gas detection cavity 3. Among them, the reaction gas sensor 4 includes various reducing gas chemical sensors such as CO and H2 and various sensors for detecting non-reducing gases such as CH4 and CO2. The reaction gas sensor 4 monitors the concentrations of gases such as CO, H2, NH3, CH4, CO2, etc. during the room temperature oxidation of the filling material, and the oxygen sensor monitors the concentration of O2 in the cavity. In addition, a pressure detection gauge 6 is provided on the top of the outside of the gas detection cavity 3 to monitor the pressure inside the gas detection cavity 3 in real time.

[0034] The data processing system includes a data processing box 9 and a computer terminal 10. The data processing box 9 is respectively connected to the thermocouple temperature sensor 2, the pressure detection gauge 6, the reaction gas sensor 4 and the oxygen sensor 5 through the data transmission line 8. The data processing box 9 is also connected to the computer terminal 10 through the data transmission line 8.

[0035] Embodiment 2:

[0036] In this embodiment, the above filling material room temperature oxidation gas detection device with gas compensation is used to monitor, summarize, correct and process the gas in the filling material reaction process, which specifically includes the following steps:

[0037] Filling material is added to the normal temperature oxidation reaction chamber 1 of the normal temperature oxidation gas detection device containing gas compensation filling material, and the total volume of the filling material does not exceed 4 / 5 of the volume of the normal temperature oxidation reaction chamber. After the material is loaded, the gas detection chamber 3 is connected through the flange 7, and the external connection between the normal temperature oxidation reaction chamber 1 and the gas detection chamber 3 is sealed to prevent the reaction gas from leaking. The filling material reacts in the normal temperature oxidation reaction chamber 1 to produce gas, which freely diffuses into the gas detection chamber 3 through the flange 7 ring, and then the CO, H2 and other reducing gas chemical sensors and oxygen sensor 5 in the reaction gas sensor 4 are used to monitor the gas concentration, and the pressure detection meter 6 monitors the real-time pressure of the gas detection chamber 3; then the data processing box 9 is used to collect and summarize the data of the thermocouple temperature sensor 2, the reaction gas sensor 4, the oxygen sensor 5 and the pressure detection meter 6, and the corrected and processed data are obtained to obtain the accurate concentration of the normal temperature oxidation-reduction reaction gas, which is transmitted to the computer terminal 10 for storage and reading.

[0038] Since the electrochemical gas sensor does not have targeting due to the strong oxidizing electrolyte it contains, there may be mutual interference between gases, so the obtained data needs to be corrected. The specific steps include: inputting and storing the interference coefficients between known gases in the data processing box, such as the interference coefficient of H2 on the detection channel of the CO electrochemical sensor in this embodiment Interference coefficient q of CO on the detection channel of H2 electrochemical sensor H2,CO If the interference coefficient between gases is not clear, test the standard mixed gases of different concentrations and solve c i +q ij c j =C (c is the standard concentration of gas i and j, q ij is the interference coefficient of gas j to gas i, C is the detection value of the chemical sensor of gas i), the interference coefficient between gases is obtained by calculation and recorded in the data processing box 9. Then the gas concentration after the oxidation reaction is detected, and the equation is solved (where c j is the actual concentration of various reducing gases j, q ij is the interference coefficient of reducing gas j on the detection channel of the electrochemical sensor of gas i, C j is the instrument detection value of the gas j electrochemical sensor detection channel) to obtain the accurate concentration c of the redox reaction gas at room temperature j; In this embodiment, the actual concentration of CO after excluding the interference of H2 and other reducing gases c CO , the actual CO concentration c after excluding the interference of CO and other reducing gases H2 and the actual concentration of other reducing gases c j Furthermore, the gas concentration is temperature compensated and pressure compensated through the gas state equation using parameters such as reaction temperature and chamber pressure.

[0039] Finally, the computer terminal 10 is used to store the data transmitted by the data processing box 9 and display them in real time on the display.

[0040] Embodiment 3:

[0041] like Figure 1 As shown, in this embodiment, a three-hole chemical sensor design is used, combined with a room temperature oxidation gas detection device containing a filling material with gas compensation to illustrate the working process of detecting two reducing gases, CO and H2, which specifically includes the following steps:

[0042] The three sides of the gas detection chamber 3 are respectively installed with CO gas chemical sensors, H2 gas chemical sensors and oxygen sensors 4, and the last side is installed with non-reducing gas chemical sensors or sealed. When the gas generated by the filling material in the room temperature oxidation reaction chamber 1 enters the gas detection chamber 3, the CO gas chemical sensor, H2 gas chemical sensor and oxygen sensor 4 monitor the CO, H2 and oxygen concentrations during the reaction process.

[0043] Since the strong oxidizing electrolyte contained in the CO gas chemical sensor and the H2 gas chemical sensor is not targeted, the two reducing gases CO and H2 interfere with each other during detection. The data is corrected by the interference coefficient between the two gases to obtain the true reaction concentration of CO and H2 gases. If the interference coefficient between CO and H2 is known, the interference coefficient is recorded in the data processing box 9; if the interference coefficient between CO and H2 is unknown, the two-component mixed gas at different standard concentrations is measured with CO and H2 sensors respectively, and c is solved. i +q ij c j =C (c is the standard concentration of gas i and j, q ij is the interference coefficient of gas j to gas i chemical sensor, C is the gas chemical sensor detection value) the interference coefficient between the two gases can be obtained and The interference coefficient is recorded in the data processing box 9, and the data processing box 9 corrects the CO and H2 detection values ​​according to the interference coefficient to calculate the true concentration of CO and H2 gases. The calculation formula is as follows:

[0044]

[0045] After obtaining the true concentrations of CO and H2 gases, further, the gas concentrations are temperature compensated and pressure compensated through the gas state equation using parameters such as reaction temperature and cavity pressure.

[0046] The data processing box 9 transmits data such as gas concentration, filling material temperature and internal pressure to the computer terminal, which directly reflects the detection values ​​and their changing trends of the reaction gas concentration, reaction temperature and cavity pressure during the room temperature oxidation process. Further, the oxidation reaction gas production rate and the corresponding oxidation reaction cycle of the filling material can be obtained according to the displayed gas concentration change curve; further, combined with the gas space △V in the reaction cavity (cavity volume V1-filling material volume V2), the actual production amount Q of CO and H2 per unit mass of the filling material can be calculated respectively. CO ,

[0047] The embodiments are preferred implementations of the present invention, but the present invention is not limited to the above-mentioned implementations. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essential content of the present invention belong to the protection scope of the present invention.

Claims

1. A gas detection device for filling material oxidation at room temperature with gas compensation, characterized in that: Including reaction system, gas detection system and data processing system; The reaction system comprises a room-temperature oxidation reaction chamber (1), and a thermocouple temperature sensor (2) is inserted into the room-temperature oxidation reaction chamber (1); The gas detection system comprises a gas detection cavity (3), wherein the gas detection cavity (3) is a hollow cavity; at least one reaction gas sensor (4) and an oxygen sensor (5) are provided at the cavity wall of the gas detection cavity (3), wherein the reaction gas sensor (4) and the oxygen sensor (5) are screwed into the cavity wall of the gas detection cavity (3) via a threaded connection; the gas detection cavity (3) is connected to a room temperature oxidation reaction cavity (1) via an external flange (7), and gas freely diffuses from the room temperature oxidation reaction cavity (1) through the flange (7) ring to the gas detection cavity (3); The data processing system comprises a data processing box (9) and a computer terminal (10), wherein the data processing box (9) is respectively connected to a thermocouple temperature sensor (2), a reaction gas sensor (4) and an oxygen sensor (5) via a data transmission line (8); the data processing box is also connected to the computer terminal (10) via the data transmission line (8), and stores the reaction temperature, gas concentration and cavity pressure during the normal temperature oxidation process of the filling material, and draws curves of changes of various values ​​for real-time display; The thermocouple temperature sensor (2) is vertically inserted from the side of the room temperature oxidation reaction chamber (1); The insertion length of the thermocouple temperature sensor (2) is 1 / 2 of the diameter of the room temperature oxidation reaction chamber (1); The reaction gas sensor (4) comprises a reducing gas type sensor and a non-reducing reaction gas sensor; When used for detecting reducing reaction gases, the reaction gas sensor (4) includes sensors for all types of reducing gases that can be generated by the filling material; When used for detecting non-reducing reaction gases, the reaction gas sensor (4) is installed separately by selecting a corresponding gas sensor according to the type of the detected gas.

2. The room temperature oxidation gas detection device containing gas compensation for filling materials according to claim 1 is characterized in that: A pressure detection gauge (6) is provided on the top of the outside of the gas detection cavity (3), and the pressure detection gauge (6) is connected to a data processing box (9) via a data transmission line (8).

3. The room temperature oxidation gas detection device containing gas compensation for filling materials according to claim 1 is characterized in that: The reaction gas sensor (4) and the oxygen sensor (5) are distributed on the side wall of the gas detection cavity.

4. The method for using the room temperature oxidation gas detection device containing gas compensation filling material according to any one of claims 1 to 3, characterized in that: include: A filling material is added to a room temperature oxidation reaction chamber (1) and connected to a gas detection chamber (3) via a flange (7). The gas generated by the reaction freely diffuses from the room temperature oxidation reaction chamber (1) through the hollow portion of the flange (7) to the gas detection chamber (3). Then, a reaction gas sensor (4) and an oxygen sensor (5) are used to monitor the gas concentration, and a pressure detection gauge (6) monitors the real-time pressure of the gas detection chamber (3). Then, a data processing box (9) is used to collect and summarize data from the thermocouple temperature sensor (2), the reaction gas sensor (4), the oxygen sensor (5) and the pressure detection gauge (6), and transmit the data to a computer terminal (10). The computer terminal (10) stores the data of the reaction temperature, gas concentration and chamber pressure during the room temperature oxidation of the filling material, and draws curves of changes in various values ​​for real-time display. When the detected gas is a reducing gas, the data processing box (9) corrects the accurate concentration of the gas generated by normal temperature oxidation to obtain the real concentration of the reducing gas, and then transmits the real concentration of the reducing gas to the computer terminal (10); The correction step is: solving a formula using interference parameters between the mixed gases and the concentration of the mixed gases detected by the corresponding reaction gas sensor (4); The formula is: ; Among them, c j is the actual concentration of various reducing gases j, q ij is the interference coefficient of reducing gas j on the detection channel of the electrochemical sensor of gas i, C j is the instrument detection value of the detection channel of the electrochemical sensor of gas j, and j is a positive integer.

5. The method of use according to claim 4, characterized in that: The total volume of the filling material does not exceed 4 / 5 of the volume of the room temperature oxidation reaction chamber (1).

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