Coal measure stratum helium and harmful gas analysis and detection system

Abstract

The utility model discloses a coal measure strata helium and harmful gas analysis and detection system, including gas delivery system, sample introduction system, separation system and detection system, gas delivery system includes gas generator, air compressor and gas compression jar, sample introduction system includes first six -way valve, first ration ring and first chromatographic column, separation system includes first separation unit, second separation unit and separation and conversion unit, detection system includes TCD detector, FPD detector and FID detector. The utility model can effectively realize coal measure strata helium and harmful gas's analysis and detection, and can detect other various mixed gas component, simple structure, high sensitivity, low operating cost. Can determine the natural gas component and its content in the evaluation area in advance, provides reliable data for helium resource evaluation and rich helium beneficial area optimization, prevents or reduces the harmful gas caused by coalbed gas development process simultaneously and causes various influences, improves the development and utilization of coalbed gas resources.

Description

Technical Field

[0001] This utility model relates to the technical field of coalbed methane component gas analysis equipment, specifically to a coal-bearing strata helium and harmful gas analysis and detection system. Background Technology

[0002] Coalbed methane contains a variety of mixed gases, which can be used for various purposes after development. For example, gases mainly composed of hydrocarbons can be processed into high-quality clean energy; small amounts of the rare gas helium can serve as an important national strategic resource. However, coalbed methane also contains harmful gases such as sulfides, nitrides, and carbon monoxide, which can cause damage to health and the environment. For instance, the construction of national railways and highways often passes through numerous oil fields, oil and gas-bearing structures, and coal-bearing strata. The generation of harmful gases can severely impact the safety of tunnel construction and operation. The release of harmful gases from coal seams can pollute the atmosphere, mine wastewater can pollute surface and groundwater, and the extraction and loosening systems can occupy large amounts of farmland, while construction can generate noise pollution. Therefore, we should take preventative measures to minimize or reduce the various impacts caused by harmful gases generated during coalbed methane exploration and development. In recent years, with the increasing scale and extent of coalbed methane exploration and development, helium has been discovered as a component of the gas. Helium, as a rare gas, is an irreplaceable strategic and scarce resource in the modern high-tech industrial chain. Exploring its geographical distribution and testing its component content are of great significance for the development and utilization of coalbed methane. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide a coal-bearing strata helium and harmful gas analysis and detection system, which solves the problems of incomplete detection of mixed gas components in coal-bearing strata, low sensitivity, and cumbersome process flow in existing devices.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a coal-bearing strata helium and harmful gas analysis and detection system, comprising a gas delivery system, a separation system connected to the gas delivery system, a sample injection system connected to the gas delivery system, and a detection system connected to the separation system and the sample injection system respectively.

[0005] The sample introduction system is connected to the separation system.

[0006] The gas delivery system includes a gas generator, an air compressor, and a gas compression tank.

[0007] The injection system includes: a first six-way valve, a first quantitative loop, and a first chromatographic column.

[0008] The separation system includes: a first separation unit, a second separation unit, and a separation and conversion unit.

[0009] The detection system includes a TCD detector, an FPD detector, and an FID detector.

[0010] This utility model also has the following technical features:

[0011] The first six-way valve has its port 5 connected to an air compressor.

[0012] The interface 4 of the first six-way valve is connected to the FPD detector through the first chromatographic column.

[0013] The first six-way valve has ports 3 and 6 connected to the first metering ring.

[0014] The interface 1 of the first six-way valve is the sample inlet.

[0015] The interface 2 of the first six-way valve is connected to the first separation unit.

[0016] The first separation unit includes: a second six-way valve, a second quantitative loop, and a second chromatographic column.

[0017] The second six-way valve has its port 5 connected to a gas generator.

[0018] The second six-way valve's interface 4 is connected to the FID detector via the second chromatographic column.

[0019] The second six-way valve has ports 3 and 6 connected to the second metering ring.

[0020] The second six-way valve's interface 2 is connected to the second separation unit.

[0021] The interface 1 of the second six-way valve is connected to the interface 2 of the first six-way valve.

[0022] The second separation unit includes: a ten-way valve, a third quantitative loop, a third chromatographic column, a fourth chromatographic column, and a first isolation valve.

[0023] The ten-way valve has ports 7 and 4 connected to a gas compression tank.

[0024] The ten-way valve's port 6 is connected to the third chromatographic column and port 2.

[0025] The interface 5 of the ten-way valve is connected to the separation and conversion unit via the fourth chromatographic column.

[0026] The port 3 of the ten-way valve is vented through the first isolation valve.

[0027] The ten-way valve has ports 1 and 8 connected to the third metering ring.

[0028] The port 9 of the ten-way valve is the discharge port.

[0029] The interface 10 of the ten-way valve and the interface 2 of the second six-way valve.

[0030] The separation and conversion unit includes a third six-way valve, a fifth chromatographic column, and a second isolation valve.

[0031] The third six-way valve's interface 5 is connected to the fourth chromatographic column.

[0032] The interface 4 of the third six-way valve is connected to the interface 3 of the fifth chromatographic column.

[0033] The third six-way valve has its interface 2 connected to a TCD detector.

[0034] The third six-way valve has ports 1 and 6 connected to the second isolation valve.

[0035] A first drying device is also installed between the first six-way valve and the air compressor, and a second drying device is also installed between the second six-way valve and the gas generator.

[0036] Compared with the prior art, this utility model has the following technical effects:

[0037] (I) This utility model provides a helium and harmful gas analysis and detection system for coal-bearing strata, which can effectively analyze and detect helium and harmful gases in coal-bearing strata, and can also detect other mixed gas components. It features a simple structure, high sensitivity, and low operating cost. It can determine the composition and content of natural gas in the evaluation area in advance, providing reliable data for helium resource evaluation and the selection of favorable helium-rich areas. Simultaneously, it prevents or reduces the various impacts caused by harmful gases generated during coalbed methane development, thereby improving the development and utilization rate of coalbed methane resources.

[0038] (II) The coal-bearing strata helium and harmful gas analysis and detection system provided by this utility model can determine the composition and content of natural gas in the evaluation area in advance, provide reliable data for helium resource evaluation and selection of helium-rich favorable areas, and at the same time prevent or reduce the various impacts caused by harmful gases generated during coalbed methane development, thereby improving the development and utilization rate of coalbed methane resources.

[0039] (III) The helium and harmful gas analysis and detection system for coal-bearing strata provided by this utility model is simple in structure, easy to operate, safe and reliable, and highly adaptable. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of the coal-bearing strata helium and harmful gas analysis and detection system of this utility model.

[0041] The meanings of the labels in the attached diagram are as follows:

[0042] 1-Gas delivery system, 2-Separation system, 3-Sample injection system, 4-Detection system, 5-First drying device, 6-Second drying device.

[0043] 1-1-Gas generator, 1-2-Air compressor, 1-3-Gas compression tank.

[0044] 2-1-First six-way valve, 2-2-First quantitative loop, 2-3-First chromatographic column.

[0045] 3-1-First separation unit, 3-2-Second separation unit, 3-3-Separation and conversion unit.

[0046] 4-1-TCD detector, 4-2-FPD detector, 4-3-FID detector.

[0047] 3-1-1-Second six-way valve, 3-1-2-Second quantitative loop, 3-1-3-Second chromatographic column.

[0048] 3-2-1-Ten-way valve, 3-2-2-Third quantitative ring, 3-2-3-Third chromatographic column, 3-2-4-Fourth chromatographic column, 3-2-5-First isolation valve.

[0049] 3-3-1-Third six-way valve, 3-3-2-Fifth chromatographic column, 3-3-3-Second isolation valve.

[0050] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0051] Unless otherwise specified, all components in this invention are made from components known in the prior art.

[0052] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0053] Example 1:

[0054] This embodiment provides a system for analyzing and detecting helium and harmful gases in coal-bearing strata, such as... Figure 1 As shown, it includes a gas delivery system 1, a separation system 3 connected to the gas delivery system 1, a sample injection system 2 connected to the gas delivery system 1, and a detection system 4 connected to the separation system 3 and the sample injection system 2 respectively.

[0055] The sample introduction system 2 is connected to the separation system 3.

[0056] The gas delivery system 1 includes: a gas generator 1-1, an air compressor 1-2, and a gas compression tank 1-3.

[0057] The injection system 2 includes: a first six-way valve 2-1, a first quantitative loop 2-2, and a first chromatographic column 2-3.

[0058] The separation system 3 includes: a first separation unit 3-1, a second separation unit 3-2, and a separation and conversion unit 3-3.

[0059] The detection system 4 includes: TCD detector 4-1, FPD detector 4-2 and FID detector 4-3.

[0060] A thermal conductivity detector (TCD), also known as a thermal conductivity cell or hot wire detector, is the most commonly used, earliest, and most widely applied detector in gas chromatography. The working principle of a thermal conductivity detector is based on the fact that different gases have different thermal conductivities.

[0061] A flame photometric detector (FPD) is a highly selective and sensitive detector used in gas chromatography for phosphorus and sulfur-containing compounds. When a sample burns in a hydrogen-rich flame, phosphorus-containing organic compounds mainly emit light at a wavelength of 526 nm in the form of HPO fragments, while sulfur-containing compounds emit characteristic light at a wavelength of 394 nm in the form of S2 molecules. A photomultiplier tube converts the light signal into an electrical signal, which is then amplified and recorded by a microcurrent.

[0062] A hydrogen flame ionization detector, also known as a flame ionization detector (FID), is a machine used to test the ionization of hydrogen flames.

[0063] Using a gas generator 1-1, a large amount of gas can be generated in a short time. Compared with purchasing gas compression tanks, gas generators can provide a more efficient and economical gas supply, and are also environmentally friendly, safe, easy to use, and ready to use immediately.

[0064] The first quantitative loop 2-2 of the injection system 2 can effectively control the injection volume, avoid sample waste, and ensure the accuracy of the injection volume. Especially when injecting manually, the precise injection volume is usually more than half of the capacity of the quantitative loop. The quantitative loop can efficiently separate the components in complex samples, improving the accuracy and sensitivity of the analysis.

[0065] By using six-way and ten-way valves, the components of the mixed gas can be effectively separated, ensuring that the gas enters the corresponding detector. This guarantees the effective separation of helium and harmful gases from coal-bearing strata, achieving the purpose of analysis and detection.

[0066] This invention can effectively analyze and detect helium and harmful gases in coal-bearing strata, and can also detect various other mixed gas components. It features a simple structure, high sensitivity, and low operating costs. It can determine the composition and content of natural gas in the evaluation area in advance, providing reliable data for helium resource evaluation and the selection of favorable helium-rich areas. Simultaneously, it prevents or reduces the various impacts caused by harmful gases generated during coalbed methane development, thereby improving the development and utilization rate of coalbed methane resources.

[0067] As a preferred embodiment:

[0068] The port 5 of the first six-way valve 2-1 is connected to the air compressor 1-2.

[0069] The interface 4 of the first six-way valve 2-1 is connected to the FPD detector 4-2 through the first chromatographic column 2-3.

[0070] The first six-way valve 2-1 has ports 3 and 6 connected to the first metering ring 2-2.

[0071] The interface 1 of the first six-way valve 2-1 is the sample inlet.

[0072] The interface 2 of the first six-way valve 2-1 is connected to the first separation unit 3-1.

[0073] Switch the first six-way valve 2-1 to connect interface 1 and interface 6, interface 2 and interface 3, and interface 4 and interface 5.

[0074] A gas sample is injected into the first quantitative loop 2-2, and then the six-way valve is switched to connect interface 1 and interface 2, interface 3 and interface 4, and interface 5 and interface 6. The carrier carries the gas sample into the detection system 4. This system is used for the detection of hydrocarbon gases.

[0075] As a preferred embodiment:

[0076] The first separation unit 3-1 includes: a second six-way valve 3-1-1, a second quantitative ring 3-1-2, and a second chromatographic column 3-1-3.

[0077] The port 5 of the second six-way valve 3-1-1 is connected to the gas generator 1-1.

[0078] The interface 4 of the second six-way valve 3-1-1 is connected to the FID detector 4-3 through the second chromatographic column 3-1-3.

[0079] The second six-way valve 3-1-1 has ports 3 and 6 connected to the second metering ring 3-1-2.

[0080] The second six-way valve 3-1-1 has its port 2 connected to the second separation unit 3-2.

[0081] The interface 1 of the second six-way valve 3-1-1 is connected to the interface 2 of the first six-way valve 2-1.

[0082] The second six-way valve 3-1-1 is switched to connect interface 1 and interface 6, interface 2 and interface 3, and interface 4 and interface 5. Then, the second six-way valve 3-1-1 is switched to connect interface 1 and interface 2, interface 3 and interface 4, and interface 5 and interface 6, and the gas sample in the second quantitative loop 3-1-2 enters the detection system 4 along with the carrier.

[0083] The second quantitative ring 3-1-2 is a quantitative ring with a volume of 0.25 mL that has undergone passivation treatment.

[0084] The second chromatographic column 3-1-3 is a sulfur capillary column, used in the analysis and detection system for helium and harmful gases in coal-bearing formations for the separation of sulfur-containing gases.

[0085] As a preferred embodiment:

[0086] The second separation unit 3-2 includes: a ten-way valve 3-2-1, a third quantitative ring 3-2-2, a third chromatographic column 3-2-3, a fourth chromatographic column 3-2-4, and a first isolation valve 3-2-5.

[0087] The ports 7 and 4 of the ten-way valve 3-2-1 are connected to the gas compression tank 1-3.

[0088] The port 6 of the ten-way valve 3-2-1 is connected to the port 2 via the third chromatographic column 3-2-3.

[0089] The interface 5 of the ten-way valve 3-2-1 is connected to the separation and conversion unit 3-3 through the fourth chromatographic column 3-2-4.

[0090] After the 10-way valve 3-2-1 is switched, the compressed gas backflushs out the gas remaining in the pipeline through port 4.

[0091] The port 3 of the ten-way valve 3-2-1 is vented through the first isolation valve 3-2-5.

[0092] The ten-way valve 3-2-1 has its ports 1 and 8 connected to the third metering ring 3-2-2.

[0093] The port 9 of the ten-way valve 3-2-1 is the discharge port.

[0094] The port 10 of the ten-way valve 3-2-1 is connected to the port 2 of the second six-way valve 3-1-1.

[0095] The 10-way valve 3-2-1 is switched to connect interface 1 to interface 10, interface 2 to interface 3, interface 4 to interface 5, interface 6 to interface 7, and interface 8 to interface 9.

[0096] Then, the ten-way valve 3-2-1 is switched to connect interface 1 with interface 2, interface 3 with interface 4, interface 5 with interface 6, interface 7 with interface 8, and interface 9 with interface 10. The gas sample in the third quantitative loop 3-2-2 enters the detection system 4 along with the carrier.

[0097] The ten-way valve 3-2-1, based on the gas path, connects the gas sample in the third metering loop 3-2-2 to the first isolation valve 3-2-5 via the fourth chromatographic column 3-2-4, isolating and venting water vapor and C2+ gas in the gas path. Simultaneously, it discharges excess gas from the metering loop.

[0098] The third quantitative ring 3-2-2 is a quantitative ring with a volume of 0.25 μm that has undergone passivation treatment.

[0099] The fourth chromatographic column 3-2-4 is a Q column, used to separate gases such as hydrogen, methane, carbon dioxide, and C2+.

[0100] The first isolation valve 3-2-5 isolates carbon dioxide and water vapor in the mixed gas based on the gas path, and in conjunction with the chromatographic column, transmits the permanent gas to the detection system 4.

[0101] As a preferred embodiment:

[0102] The separation and conversion unit 3-3 includes a third six-way valve 3-3-1, a fifth chromatographic column 3-3-2, and a second isolation valve 3-3-3.

[0103] The third six-way valve 3-3-1 has its port 5 connected to the fourth chromatographic column 3-2-4.

[0104] The interface 4 of the third six-way valve 3-3-1 is connected to the interface 3 via the fifth chromatographic column 3-3-2.

[0105] The third six-way valve 3-3-1 is connected to the TCD detector 4-1 via its interface 2.

[0106] The third six-way valve 3-3-1 has ports 1 and 6 connected to the second isolation valve 3-3-3.

[0107] The fifth chromatographic column 3-3-2 is a Q column, based on the gas path connection of the ten-way valve 3-2-1 and the third six-way valve 3-3-1, used to separate hydrogen and methane in a gas mixture.

[0108] As a preferred embodiment:

[0109] A first drying device 5 is also installed between the first six-way valve 2-1 and the air compressor 1-2, and a second drying device 6 is also installed between the second six-way valve 3-1-1 and the gas generator 1-1.

[0110] The specific working process of this utility model:

[0111] The gas enters through the first six-way valve 2-1. Part of it passes through the first chromatographic column 2-3 and enters the FPD detector 4-2; the remaining part enters the second six-way valve 3-1-1 through a pipeline. This part of the gas is then divided into two parts through the second six-way valve 3-1-1. One part passes through the second chromatographic column 3-1-3 and connects to the FID detector 4-3; the other part passes through the ten-way valve 3-2-1 and finally connects to the TCD detector 4-1.

[0112] After the column oven temperature stabilizes, switch the first six-way valve 2-1 to connect interface 1 and interface 6, interface 2 and interface 3, and interface 4 and interface 5. The gas sample enters the first quantitative loop 2-2 through interface 1 and interface 6. Then switch the first six-way valve 2-1 to connect interface 1 and interface 2, interface 3 and interface 4, and interface 5 and interface 6. The carrier carries the gas sample through the first chromatographic column 2-3 into the detection system 4.

[0113] Subsequently, the second six-way valve 3-1-1 is switched to connect interface 1 and interface 6, interface 2 and interface 3, and interface 4 and interface 5. The gas sample enters interface 1 of the second six-way valve 3-1-1 through interface 1 and interface 2 of the first six-way valve 2-1. The gas sample enters the second quantitative loop 3-1-2 through interface 1 and interface 6. Then, the second six-way valve 3-1-1 is switched to connect interface 1 and interface 2, interface 3 and interface 4, and interface 5 and interface 6. The carrier carries the gas sample into the detection system 4 through the first chromatographic column 2-3.

[0114] Subsequently, switch the 10-way valve 3-2-1 to connect interface 1 with interface 10, interface 2 with interface 3, interface 4 with interface 5, interface 6 with interface 7, and interface 8 with interface 9.

[0115] The gas sample enters the port 10 of the tenth port valve 3-2-1 through port 2 of the second six-way valve 3-1-1, and then enters the third metering loop 3-2-2 through port 10 and port 1.

[0116] Then, the ten-way valve 3-2-1 is switched to connect interface 1 with interface 2, interface 3 with interface 4, interface 5 with interface 6, interface 7 with interface 8, and interface 9 with interface 10. The gas sample in the third quantitative loop 3-2-2, along with the carrier, enters interface 5 of the third six-way valve 3-3-1 through the third chromatographic column 3-2-4, and then enters the detection system 4 through the fifth chromatographic column 3-3-2.

[0117] Then, the third six-way valve 3-3-1 is switched to connect interface 1 and interface 2, interface 3 and interface 4, and interface 5 and interface 6. The gas sample enters the detection unit 9 through the second isolation valve 3-3-3.

[0118] Step 1: Conduct performance tests on the temperature, pressure, and airtightness of the analysis and testing system. The system can only be used after it passes the tests. Inspect and maintain the testing equipment to ensure that the tests can be carried out smoothly.

[0119] Step 2: Adjust the equipment according to the actual condition of the sample, inject an appropriate amount of air from the injection port, and observe the stability and sensitivity of the system to verify whether the test system is normal.

[0120] Step 3: Select appropriate parameters and inject the sample through the inlet, ensuring a stable gas flow rate during injection. Observe the real-time dynamics, separation, and detection during instrument operation to ensure stable detection and accurate data.

[0121] Step 4: After the analysis and testing are completed, the sample test results are analyzed to establish a complete test method that can effectively detect the components of mixed gas in coal-bearing strata, especially helium and harmful gas components. At the same time, the content of each component is calculated to provide a theoretical basis for the development and utilization of coalbed methane.

[0122] The above technical solutions are only preferred embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be conceived by those skilled in the art without creative effort within the technical scope disclosed in this utility model are covered within the protection scope of this utility model.

Claims

1. A system for analyzing and detecting helium and harmful gases in coal-bearing strata, characterized in that, It includes a gas delivery system (1), a sample introduction system (2) connected to the gas delivery system (1), a separation system (3) connected to the gas delivery system (1), and a detection system (4) connected to the sample introduction system (2) and the separation system (3) respectively; The sample introduction system (2) is connected to the separation system (3); The gas delivery system (1) includes: a gas generator (1-1), an air compressor (1-2), and a gas compression tank (1-3); The injection system (2) includes: a first six-way valve (2-1), a first quantitative loop (2-2), and a first chromatographic column (2-3); The separation system (3) includes: a first separation unit (3-1), a second separation unit (3-2), and a separation and conversion unit (3-3); The detection system (4) includes: a TCD detector (4-1), an FPD detector (4-2), and an FID detector (4-3).

2. The coal-bearing strata helium and harmful gas analysis and detection system as described in claim 1, characterized in that, The port 5 of the first six-way valve (2-1) is connected to the air compressor (1-2); The port 4 of the first six-way valve (2-1) is connected to the FPD detector (4-2) through the first chromatographic column (2-3); The first six-way valve (2-1) has its ports 3 and 6 connected to the first metering ring (2-2); The interface 1 of the first six-way valve (2-1) is the sample inlet; The interface 2 of the first six-way valve (2-1) is connected to the first separation unit (3-1).

3. The coal-bearing strata helium and harmful gas analysis and detection system as described in claim 2, characterized in that, The first separation unit (3-1) includes: The second six-way valve (3-1-1), the second quantitative loop (3-1-2), and the second chromatographic column (3-1-3); The second six-way valve (3-1-1) has its port 5 connected to the gas generator (1-1); The port 4 of the second six-way valve (3-1-1) is connected to the FID detector (4-3) through the second chromatographic column (3-1-3); The second six-way valve (3-1-1) has its ports 3 and 6 connected to the second metering ring (3-1-2); The second six-way valve (3-1-1) has its port 2 connected to the second separation unit (3-2); The interface 1 of the second six-way valve (3-1-1) is connected to the interface 2 of the first six-way valve (2-1).

4. The coal-bearing strata helium and harmful gas analysis and detection system as described in claim 3, characterized in that, The second separation unit (3-2) includes: The system includes a ten-way valve (3-2-1), a third quantitative loop (3-2-2), a third chromatographic column (3-2-3), a fourth chromatographic column (3-2-4), and a first isolation valve (3-2-5). The port 7 and port 4 of the ten-way valve (3-2-1) are connected to the gas compression tank (1-3); The port 6 of the ten-way valve (3-2-1) is connected to port 2 via the third chromatographic column (3-2-3); The port 5 of the ten-way valve (3-2-1) is connected to the separation and conversion unit (3-3) via the fourth chromatographic column (3-2-4); The port 3 of the ten-way valve (3-2-1) is vented through the first isolation valve (3-2-5); The ten-way valve (3-2-1) has its ports 1 and 8 connected to the third metering ring (3-2-2); The port 9 of the ten-way valve (3-2-1) is the discharge port; The interface 10 of the ten-way valve (3-2-1) and the interface 2 of the second six-way valve (3-1-1).

5. The coal-bearing strata helium and harmful gas analysis and detection system as described in claim 4, characterized in that, The separation and conversion unit (3-3) includes: The third six-way valve (3-3-1), the fifth chromatographic column (3-3-2), and the second isolation valve (3-3-3); The third six-way valve (3-3-1) has its port 5 connected to the fourth chromatographic column (3-2-4); The port 4 of the third six-way valve (3-3-1) is connected to port 3 through the fifth chromatographic column (3-3-2); The third six-way valve (3-3-1) has its port 2 connected to a TCD detector (4-1); The third six-way valve (3-3-1) has its ports 1 and 6 connected to the second isolation valve (3-3-3).

6. The coal-bearing strata helium and harmful gas analysis and detection system as described in claim 1, characterized in that, A first drying device (5) is also installed between the first six-way valve (2-1) and the air compressor (1-2), and a second drying device (6) is also installed between the second six-way valve (3-1-1) and the gas generator (1-1).

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