A low concentration gas carbon emission monitoring system

Abstract

This utility model discloses a low-concentration methane carbon emission monitoring system, relating to the field of gas monitoring technology. It includes a gas flow meter comprising a hollow tube and a flow probe. A sealing tube is fixedly connected to the outer side of one end of the hollow tube, and one end of the sealing tube is sealed to the hollow tube. A sampling tube is fixedly connected to the other end of the sealing tube, and the flow probe is fixedly connected to the other end of the hollow tube through the sampling tube. A sampling channel is provided between the sampling tube and the hollow tube, and a sampling interface communicating with the sampling channel is provided on the outer side of the sealing tube. The sampling interface is in fluid communication with a gas sensor. The gas sensor and the gas flow meter are electrically connected to a controller via signal transmission lines. This low-concentration methane carbon emission monitoring system is easy to install and has high detection accuracy.

Description

Technical Field

[0001] This utility model relates to the field of gas monitoring technology, specifically a low-concentration methane carbon emission monitoring system. Background Technology

[0002] In the fields of coal mining and clean energy utilization, accurate carbon flux detection of coal mine gas is a core element in optimizing gas oxidation heating technology and achieving energy conservation and emission reduction. Traditional gas detection technologies mainly focus on measuring single parameters such as concentration or flow rate, which is insufficient to meet the needs of modern industry for accurate carbon emission measurement and dynamic control.

[0003] Traditional gas and carbon flux detection systems typically require separate installation holes for flow meters and sampling holes for concentration sensors on the pipeline, necessitating at least two independent openings for single-point detection. This multi-opening design not only increases construction difficulty but also significantly raises the risk of pipeline seal failure. Furthermore, the separation between the flow meter and concentration sensor installed in these independent openings makes it difficult to synchronize the acquisition timing of flow and concentration parameters, affecting detection accuracy.

[0004] Therefore, it is necessary to propose a low-concentration methane carbon emission monitoring system to solve the above problems. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] The purpose of this invention is to provide a low-concentration methane carbon emission monitoring system to solve the problems mentioned in the background art.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a low-concentration gas carbon emission monitoring system, comprising a gas flow meter, the gas flow meter including a hollow tube and a flow probe, a sealing tube fixedly connected to the outer side of one end of the hollow tube, one end of the sealing tube being sealed to the hollow tube, a sampling tube fixedly connected to the other end of the sealing tube, and a flow probe fixedly connected to the other end of the hollow tube through the sampling tube, a sampling channel being provided between the sampling tube and the hollow tube, and a sampling interface communicating with the sampling channel being provided on the outer side of the sealing tube; the sampling interface being in fluid communication with a gas sensor, and the gas sensor and the gas flow meter being electrically connected to a controller via signal transmission lines.

[0009] Preferably, the gas flow meter is a thermal gas mass flow meter.

[0010] Preferably, it also includes an explosion-proof housing, which is fixedly connected to a sealing tube, and the gas sensor and controller are both fixedly connected inside the explosion-proof housing.

[0011] Preferably, a flange is fixedly connected to one end of both the sampling tube and the sealing tube, and the sampling tube and the sealing tube are fixedly connected by the flange, with a sealing gasket provided between the two flanges.

[0012] Preferably, a filter and an air pump are connected in series between the sampling tube and the gas sensor.

[0013] Preferably, a three-way solenoid valve is provided between the gas sensor and the gas pump. One of the air inlets of the three-way solenoid valve is connected to the air outlet of the gas pump, the other air inlet of the three-way solenoid valve is connected to a calibration tube, and the air outlet of the three-way solenoid valve is connected to the air inlet of the gas sensor.

[0014] Preferably, a flow meter is provided between the gas sensor and the gas pump, and a shunt pipe is provided at the outlet of the gas pump in parallel with the gas sensor and the flow meter.

[0015] Preferably, the filter is connected to the air pump via a three-position two-way solenoid valve with a backflush pipe.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, this utility model provides a low-concentration methane carbon emission monitoring system, which has the following beneficial effects:

[0018] 1. This low-concentration methane carbon emission monitoring system improves its detection accuracy by detecting methane flow and concentration at the same location in the pipeline and calculating the methane carbon flux per unit time in combination with the pipe diameter.

[0019] 2. This low-concentration methane carbon emission monitoring system can detect flow rate and sample gas by opening a through hole in the pipeline, reducing the number of openings and making it easier to install; at the same time, the sampling channel is separated from the detection circuit of the flow probe by a hollow tube to prevent methane gas from entering and ensure its stable operation in flammable and explosive environments. Attached Figure Description

[0020] Figure 1 This is a cross-sectional schematic diagram of the sampling tube of this utility model;

[0021] Figure 2 This is a side view of the structure of this utility model;

[0022] Figure 3 This is a front view schematic diagram of the structure of this utility model.

[0023] In the diagram: 1. Sampling tube; 2. Sealing gasket; 3. Sealing tube; 4. Sampling interface; 5. Hollow tube; 6. Flow probe; 7. Sampling channel; 8. Gas flow meter; 9. Explosion-proof housing; 10. Filter; 11. Three-position two-way solenoid valve; 12. Air pump; 13. Calibration tube; 14. Backflush tube; 15. Flow meter; 16. Gas sensor; 17. Three-way solenoid valve. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Please see Figure 1-3 As shown, a low-concentration methane carbon emission monitoring system includes a gas flow meter 8, which comprises a hollow tube 5 and a flow probe 6. A sealing tube 3 is fixedly connected to the outer side of one end of the hollow tube 5, and one end of the sealing tube 3 is sealed to the hollow tube 5. A sampling tube 1 is fixedly connected to the other end of the sealing tube 3. The flow probe 6 is fixedly connected to the other end of the hollow tube 5 through the sampling tube 1. A sampling channel 7 is provided between the sampling tube 1 and the hollow tube 5. A sampling interface 4 communicating with the sampling channel 7 is provided on the outer side of the sealing tube 3. The sampling interface 4 is in fluid communication with a gas sensor 16. The gas sensor 16 and the gas flow meter 8 are electrically connected to the controller through signal transmission lines. Specifically, the gas sensor 16 is a laser methane sensor. The gas flow meter 8 is a thermal gas mass flow meter.

[0026] In use, one end of the sampling tube 1 is inserted into the inside of the gas delivery pipeline and sealed and fixed to the gas delivery pipeline by welding or other methods. Then, the flow probe 6 is inserted into the sampling tube 1, and the sampling tube 1 is sealed and connected to the sealing tube 3. The gas flow meter 8 detects the gas velocity in the pipeline in real time through the flow probe 6 and transmits the flow velocity data to the controller via an electrical signal. The gas sensor 16 continuously monitors the gas concentration in the gas in the pipeline and transmits the concentration data synchronously to the controller. The controller calculates the gas carbon flux per unit time based on the pre-stored pipeline inner diameter, flow velocity, and gas concentration. Flow velocity detection and gas sampling can be achieved by opening a through hole in the pipeline, reducing the number of openings and making installation more convenient. At the same time, the sampling channel 7 and the detection circuit of the flow probe 6 are separated by the hollow tube 5 to prevent gas from entering and ensure stable operation in flammable and explosive environments.

[0027] It also includes an explosion-proof housing 9, which is fixedly connected to the sealing tube 3. The gas sensor 16 and the controller are both fixedly connected inside the explosion-proof housing 9. By setting the explosion-proof housing 9 to seal the internal circuit, gas is prevented from entering, ensuring its stable operation in flammable and explosive environments.

[0028] To facilitate installation, flanges are fixedly connected to adjacent ends of sampling tube 1 and sealing tube 3. Sampling tube 1 and sealing tube 3 are fixedly connected by flanges, and a sealing gasket 2 is provided between the two flanges. By using flanges for fixing, disassembly and maintenance are made more convenient.

[0029] To prevent impurities in the gas from entering the gas sensor 16 and affecting the accuracy of gas detection, a filter 10 and an air pump 12 are connected in series between the sampling tube 1 and the gas sensor 16. By setting the air pump 12, the pressure drop caused by the resistance of the filter 10 can be overcome, ensuring that the system can maintain a stable gas flow rate even when the filter 10 is dusty or when the operating conditions fluctuate.

[0030] In some embodiments, a three-way solenoid valve 17 is provided between the gas sensor 16 and the gas pump 12. One inlet of the three-way solenoid valve 17 is connected to the outlet of the gas pump 12, and the other inlet of the three-way solenoid valve 17 is connected to a calibration tube 13. The outlet of the three-way solenoid valve 17 is connected to the inlet of the gas sensor 16. The three-way solenoid valve 17 controls the connection between the calibration tube 13 and the gas sensor 16, allowing methane gas of a specified concentration to be introduced into the gas sensor 16 through the calibration tube 13 for calibration.

[0031] Because the gas supply via the air pump 12 results in a gas flow rate exceeding the optimal operating range calibrated by the gas sensor 16, a flow meter 15 is installed between the gas sensor 16 and the air pump 12. A shunt pipe, connected in parallel with the gas sensor 16 and the flow meter 15, is installed at the outlet of the air pump 12. The shunt pipe diverts excess gas, reducing the gas flow rate entering the gas sensor 16. The flow rate entering the gas sensor 16 is detected by the flow meter 15, and the controller controls the speed of the air pump 12 based on the gas flow rate detected by the flow meter 15, ensuring that the gas flow rate remains consistently stable within the optimal operating range calibrated by the sensor.

[0032] To facilitate the removal of excess impurities from the filter 10, a backflush pipe 14 is connected between the filter 10 and the air pump 12 via a three-position two-way solenoid valve 11. When cleaning the filter 10, the backflush pipe 14 is connected to the filter 10 via the three-position two-way solenoid valve 11, and the filter 10 is cleaned by backflush through the backflush pipe 14.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-concentration methane carbon emission monitoring system, comprising a gas flow meter (8), characterized in that: The gas flow meter (8) includes a hollow tube (5) and a flow probe (6). A sealing tube (3) is fixedly connected to the outer side of one end of the hollow tube (5). One end of the sealing tube (3) is sealed to the hollow tube (5). A sampling tube (1) is fixedly connected to the other end of the sealing tube (3). The flow probe (6) is fixedly connected to the other end of the hollow tube (5) through the sampling tube (1). A sampling channel (7) is provided between the sampling tube (1) and the hollow tube (5). A sampling interface (4) communicating with the sampling channel (7) is provided on the outer side of the sealing tube (3). The sampling interface (4) is in fluid communication with the gas sensor (16), and the gas sensor (16) and the gas flow meter (8) are electrically connected to the controller through signal transmission lines.

2. The low concentration gas carbon emission monitoring system of claim 1, wherein: The gas flow meter (8) is a thermal gas mass flow meter.

3. The low concentration gas carbon emission monitoring system of claim 1, wherein: It also includes an explosion-proof housing (9), which is fixedly connected to a sealing tube (3), and the gas sensor (16) and the controller are both fixedly connected inside the explosion-proof housing (9).

4. The low concentration gas carbon emission monitoring system of claim 1, wherein: The sampling tube (1) and the sealing tube (3) are both fixedly connected to a flange at one of their adjacent ends. The sampling tube (1) and the sealing tube (3) are fixedly connected by the flange, and a sealing gasket (2) is provided between the two flanges.

5. The low concentration gas carbon emission monitoring system of claim 1, wherein: A filter (10) and an air pump (12) are connected in series between the sampling tube (1) and the gas sensor (16).

6. A low concentration gas carbon emission monitoring system as claimed in claim 5 wherein: A three-way solenoid valve (17) is provided between the gas sensor (16) and the air pump (12). One of the air inlets of the three-way solenoid valve (17) is connected to the air outlet of the air pump (12), and the other air inlet of the three-way solenoid valve (17) is connected to a calibration tube (13). The air outlet of the three-way solenoid valve (17) is connected to the air inlet of the gas sensor (16).

7. The low concentration gas carbon emission monitoring system of claim 5, wherein: A flow meter (15) is provided between the gas sensor (16) and the air pump (12), and a shunt pipe is provided at the outlet of the air pump (12) in parallel with the gas sensor (16) and the flow meter (15).

8. The low concentration gas carbon emission monitoring system of claim 5, wherein: The filter (10) and the air pump (12) are connected by a backflush pipe (14) via a three-position two-way solenoid valve (11).

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