Detection method for 5E-CHN200 elemental analyzer

Abstract

The invention provides a detection method for a 5E-CHN200 elemental analyzer, which comprises the following steps: arranging a first gas change-over valve at the joint of a first oxygen gas path and a helium gas path, and communicating the first gas change-over valve with a carrier gas path; the carrier gas passage is connected with an inlet end pipeline of the hydrocarbon detection device, and the gas storage tank is also connected with the inlet end pipeline of the hydrocarbon detection device; the outlet end of the hydrocarbon detection device is connected with a conversion line pipeline; the conversion line comprises a first pipeline and a second pipeline which are arranged in parallel; a second gas conversion valve is arranged on the first pipeline, and a third gas conversion device and a nitrogen conversion device are arranged on the second pipeline; and the outlet end of the conversion line is connected with the nitrogen detection line. According to the invention, the gas flow and direction are reasonably regulated and controlled, and meaningless consumption of gas leakage and ineffective reaction on copper particles and drying agents is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of coal analysis, and in particular to a detection method for a 5E-CHN200 element analyzer. Background Art

[0002] The existing 5E-CHN200 elemental analyzer uses high-temperature combustion to convert carbon, hydrogen, and nitrogen in coal into carbon dioxide (CO2), hydrogen (H2O), and nitrogen dioxide (NO), and then measures concentrations using infrared absorption. However, this traditional method has several drawbacks: It requires simultaneous oxygen and helium flow, with helium serving as the carrier gas, which is costly.

[0003] In summary, the prior art has at least the following problems: when the 5E-CHN200 elemental analyzer is used to detect the element content in coal, the detection cost is high. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem of how to improve the efficiency of 5E-CHN200 element analyzer in detecting the element content of coal and reduce the maintenance cost.

[0005] To this end, an embodiment of the present invention provides a detection method for a 5E-CHN200 elemental analyzer, and in particular, a detection path separation method for a 5E-CHN200 elemental analyzer, the method comprising:

[0006] A first gas conversion valve is provided at the connection between the first oxygen gas path and the helium gas path, and the first gas conversion valve is connected to the carrier gas path; a first gas conversion valve is added in front of the large purification chamber to replace helium with oxygen as the carrier gas, and flexible switching of the carrier gas type is achieved through valve control.

[0007] The carrier gas passage is connected to the inlet pipeline of the hydrocarbon detection device, and the gas storage tank is also connected to the inlet pipeline of the hydrocarbon detection device;

[0008] Connect the outlet of the hydrocarbon detection device to the conversion line pipeline;

[0009] The conversion circuit includes a first pipeline and a second pipeline, wherein the first pipeline and the second pipeline are arranged in parallel;

[0010] A second gas switching valve is provided on the first pipeline, and a third gas switching valve and a nitrogen conversion device are provided on the second pipeline;

[0011] The outlet end of the conversion line is connected to the nitrogen detection line.

[0012] Specifically, a large purification chamber, a first flow sensor and a quantitative valve are arranged on the carrier gas passage.

[0013] Specifically, the oxygen storage tank is connected to both the first oxygen gas path and the second oxygen gas path, and a combustion tube and a filtering system are sequentially arranged on the second oxygen gas path along the gas flow direction.

[0014] Specifically, the combustion tube is configured to be U-shaped.

[0015] Specifically, the second oxygen gas circuit is connected to the gas storage tank.

[0016] Specifically, the hydrocarbon detection device includes a H2O infrared cell, a CO2 infrared cell and a second flow sensor.

[0017] Specifically, a second gas conversion valve and a sensor are sequentially arranged on the first pipeline along the gas flow direction; a third gas conversion valve, a reduction furnace and a small purification chamber are sequentially arranged on the second pipeline along the gas flow direction.

[0018] Specifically, a fourth gas switching valve, a fifth gas switching valve and a thermal conductivity cell are provided on the nitrogen detection circuit;

[0019] The fourth gas switching valve and the fifth gas switching valve are arranged in parallel;

[0020] The fifth gas switching valve is connected in series with the thermal conductivity cell.

[0021] Specifically, when testing for elements C and H, the first gas switching valve is adjusted to connect the first oxygen gas path to the carrier gas path, closing the helium gas path. Simultaneously, the third and fifth gas switching valves are closed, while the second and fourth gas switching valves are opened. By optimizing the gas paths, unnecessary N element testing processes are precisely eliminated, effectively reducing the consumption of high-purity argon and helium, and improving testing efficiency and resource utilization.

[0022] Specifically, when detecting the N element, the first gas conversion valve is adjusted to connect the helium gas path with the carrier gas path, the first oxygen gas path is closed, and the second gas conversion valve and the fourth gas conversion valve are closed, and the third gas conversion valve and the fifth gas conversion valve are opened.

[0023] The beneficial effects of this invention are as follows: the technical solution precisely separates the detection paths for the C and H elements, avoiding unnecessary N detection steps and thus reducing the loss of copper particles and desiccant due to redundant detection reactions. Upgrading the gas system to rationally regulate gas flow and direction allows the reactive gases to more efficiently participate in the C and H element detection reactions, reducing gas leakage and unnecessary consumption of copper particles and desiccant due to ineffective reactions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1This is a flow chart of a detection method for a 5E-CHN200 element analyzer provided in an embodiment of the present invention;

[0025] Figure 2 This is a flow chart of a first implementation of a detection method for a 5E-CHN200 element analyzer provided in an embodiment of the present invention.

[0026] Description of Figure Numbers:

[0027] 1. Helium gas line; 2. First oxygen gas line; 3. Carrier gas line; 4. Second oxygen gas line; 5. First pipeline; 6. Second pipeline; 7. Hydrocarbon detection device. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] When the applicant used the 5E-CHN200 elemental analyzer to detect the element content in coal, it was found that: the oxygen and helium gas lines needed to be opened at the same time during the test, and helium was used as a carrier gas, which was expensive and unnecessary. In addition, the applicant also found that the consumables were greatly lost, and the redundant N element detection process required the use of a reduction furnace (consuming copper particles) and a small purification room (consuming desiccant), resulting in high maintenance costs. The applicant also found that the current detection efficiency was low, the gas path was complex, the process was redundant, and there was a gas retention problem in the thermal conductivity cell link. The single detection time was as long as 11 minutes, which was shortened from the original 11 minutes to 5 minutes after the improvement.

[0030] The technical solution of the present invention directly reduces gas usage costs by controlling the pipelines of oxygen and helium. The path separation and short-circuit design are adopted to optimize the gas transmission path and improve the operating efficiency of the system. Path separation avoids cross contamination, and the short-circuit structure reduces transmission loss, ensuring precise control of the system.

[0031] In the embodiment of the present invention, Figure 1 , provides a detection method for 5E-CHN200 element analyzer, the method comprising:

[0032] A first gas conversion valve is provided at the connection between the first oxygen gas line 2 and the helium gas line 1, and the first gas conversion valve is connected to the carrier gas line 3; the carrier gas line 3 is connected to the inlet end pipeline of the hydrocarbon detection device, and the gas storage tank is also connected to the inlet end pipeline of the hydrocarbon detection device; the first gas conversion valve can be a first gas conversion valve, and the connection or closure of the first oxygen gas line 2, the helium gas line 1 and the carrier gas line 3 is adjusted by controlling the first gas conversion valve.

[0033] Connect the outlet of the hydrocarbon detection device to the conversion circuit pipeline. The conversion circuit includes a first pipeline 5 and a second pipeline 6, which are arranged in parallel. A second gas conversion valve (second gas conversion valve) is installed in the first pipeline, and a third gas conversion device (third gas conversion valve) and a nitrogen conversion device are installed in the second pipeline. The first pipeline 5 uses an inner diameter of φ2.5mm±0.1mm, a high-temperature ceramic coating, and an interface sealing design (flange connection + O-ring seal). A gas circuit short-circuit structure is used, including an L-shaped stainless steel pipeline with an inner diameter of φ2.5mm±0.1mm that bypasses the reduction furnace. The interface uses a flange connection and a silicone seal ring.

[0034] The outlet end of the conversion line is connected to the nitrogen detection line.

[0035] A large clean room, a first flow sensor and a quantitative valve are arranged on the carrier gas passage. The oxygen flow is monitored in real time by the flow sensor, and a feedback signal is transmitted to a PID controller.

[0036] The oxygen storage tank is connected to both the first and second oxygen gas lines (4). A combustion tube and a filtration system are sequentially arranged along the gas flow direction on the second oxygen gas line (4). The combustion tube is U-shaped. The second oxygen gas line (4) is connected to the gas storage tank. The object being tested mixes with oxygen in the U-shaped combustion tube and burns, with the resulting combustion gases entering the gas storage tank.

[0037] The hydrocarbon detection device includes a H2O infrared cell, a CO2 infrared cell and a second flow sensor.

[0038] A second gas switching valve and sensor were placed along the first pipeline, sequentially along the gas flow direction. A third gas switching valve, a reduction furnace, and a small cleanroom were placed along the second pipeline, sequentially along the gas flow direction. The gas system was upgraded and renovated to rationally regulate gas flow and direction, allowing the reactant gas to more efficiently participate in the CH element detection reaction, reducing gas leakage and the unnecessary consumption of copper particles and desiccant due to ineffective reactions.

[0039] A fourth gas conversion device (fourth gas conversion valve), a fifth gas conversion device (fifth gas conversion valve), and a thermal conductivity cell are installed on the nitrogen detection circuit. Through targeted gas path optimization, unnecessary nitrogen detection processes are precisely eliminated, effectively reducing the consumption of high-purity argon and helium, improving detection efficiency and resource utilization. The fourth gas conversion device and the fifth gas conversion device are installed in parallel; the fifth gas conversion device and the thermal conductivity cell are installed in series. Through valve combination control, the C and H element detection paths are physically isolated from the nitrogen detection path, enabling nitrogen detection only when needed.

[0040] The first gas conversion valve, the second gas conversion valve, the third gas conversion device, the fourth gas conversion device and the fifth gas conversion device are all solenoid valves.

[0041] A PLC (PLC is a programmable logic controller, a computer control system specifically used for industrial automation) is used to precisely control the opening and closing of each gas conversion valve, achieving a rapid response in milliseconds while also meeting the precise control of gas flow direction, pressure, and flow rate. Ultimately, through multi-node valve control, carrier gas type switching (He→O2) and dynamic adjustment of the detection path (CH independent detection) are achieved. When detecting elements C and H, the first gas conversion valve is adjusted to connect the first oxygen gas path with the carrier gas path, closing the helium gas path, and simultaneously closing the third and fifth gas conversion devices, while opening the second gas conversion valve and the fourth gas conversion device. When detecting elements N, the first gas conversion valve is adjusted to connect the helium gas path with the carrier gas path, closing the first oxygen gas path, and simultaneously closing the second gas conversion valve and the fourth gas conversion device, while opening the third and fifth gas conversion devices.

[0042] The system utilizes a solenoid valve, flow sensor, and a PID control algorithm based on detection requirements to adjust oxygen flow in real time. This closed-loop control architecture uses a flow sensor to monitor oxygen flow in real time and transmits feedback signals to a PID controller. The PID controller dynamically adjusts the opening of the solenoid valve based on the set flow target and actual measured values to achieve precise control of oxygen flow. This ultimately enables dynamic switching to bypass the reduction furnace and small cleanroom, reducing consumables.

[0043] The technical solution of this invention precisely separates the detection paths for the C and H elements, avoiding unnecessary N detection steps and ultimately reducing the loss of copper particles and desiccant due to redundant detection reactions. By upgrading and renovating the gas system and rationally regulating gas flow and direction, the reaction gases more efficiently participate in the C and H element detection reactions, reducing gas leakage and unnecessary consumption of copper particles and desiccant due to ineffective reactions.

[0044] The PID controller dynamically adjusts the solenoid valve opening based on the set flow target and actual measured value to achieve precise control of the oxygen flow. Ultimately, dynamic switching is achieved to bypass the reduction furnace and small cleanroom, reducing consumables consumption.

[0045] By replacing helium with oxygen, the gas usage cost is directly reduced. The path separation and short-circuit design optimize the gas transmission path and improve the operating efficiency of the system. Path separation avoids cross contamination, and the short-circuit design reduces transmission loss and ensures precise control of the system.

[0046] Example 1:

[0047] The present invention provides a detection method for 5E-CHN200 element analyzer, which uses gas path system to reconstruct carrier gas optimization, such as Figure 2 A gas switching valve was added before the large cleanroom, replacing helium with oxygen as the carrier gas. Flexible switching of carrier gas types was achieved through valve control. The CO2 infrared cell was then modified: a new gas switching valve was added before the cell, and the piping layout was replanned, allowing gas to bypass the reduction furnace and small cleanroom required for nitrogen measurement and enter the detection phase directly. The thermal conductivity cell was also optimized: a gas switching valve was added before the cell and the exhaust port was short-circuited to precisely control gas flow and path, shortening detection time from 11 minutes to 5 minutes. Element detection paths were separated.

[0048] 1. Improvement of detection accuracy and accuracy

[0049] (1) The accuracy test was carried out using standard substances, as shown in Tables 1, 2, 3, and 4. The average values were compared with the standard values. The deviations of GBW11110s, GBW11107k, etc. were C < -0.09% and H < ±0.01%, which were in line with the method tolerance (C: ±1.30%, H: ±0.40%).

[0050] Table 1 Comparison of the first detection structure

[0051]

[0052]

[0053] Table 2 Comparison of the second detection structure

[0054]

[0055] Table 3 Comparison of the third detection structure

[0056]

[0057] (3) Conduct precision tests

[0058] Table 4 Comparison table of the fourth detection structure

[0059]

[0060] Example 2:

[0061] The present invention provides a detection method for 5E-CHN200 element analyzer.

[0062] Equipment used: Re-determine the relevant management of the element analyzer to ensure that the newly added gas conversion valve is effective and easy to detect.

[0063] Sample testing:

[0064] Select coal standard materials GBW11108u and GBW11107k for testing and perform the test according to the instrument operating procedures. Test the standard materials and record the measured values each time.

[0065] Table 5 Experimental record

[0066]

[0067] In the coal coke combustion gasification detection system, the gas path is a key component and plays a decisive role in the detection effect. We optimized the gas path. By innovating the gas pipeline, we reduced the resistance and turbulence of gas flow. At the same time, we replaced the high-precision gas flow control components to ensure the stability and accuracy of gas delivery. As a result, the detection accuracy has been significantly improved, and the detection errors originally caused by gas fluctuations have been greatly reduced. The detection time has also been significantly shortened. The gas can reach the detection area more quickly and efficiently, speeding up the detection process from the original 11 minutes to 5 minutes. Moreover, due to the reduction of unnecessary gas loss and the frequency of equipment maintenance, the detection cost has been effectively saved.

[0068] The present invention optimizes the detection process, accurately separates the detection path of the CH element, avoids the intervention of unnecessary N element detection links, and reduces the loss of copper particles and desiccant due to redundant detection reactions from the source. The gas circuit system is upgraded and renovated, and the gas flow and direction are reasonably regulated to enable the reaction gas to participate in the CH element detection reaction more efficiently, reducing gas leakage and unnecessary consumption of copper particles and desiccant due to ineffective reactions. 4. By performing targeted optimization of the gas circuit, unnecessary N element detection processes are accurately eliminated, effectively reducing the consumption of high-purity argon and helium, and improving detection efficiency and resource utilization.

[0069] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. The various components of the present invention may be combined with each other without conflict, and any equivalent changes and modifications made by a person skilled in the art without departing from the concept and principles of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A detection method for 5E-CHN200 element analyzer, characterized in that: The method comprises: A first gas switching valve is provided at the connection between the first oxygen gas path (2) and the helium gas path (1), and the first gas switching valve is communicated with the carrier gas path (3); The carrier gas passage (3) is connected to the inlet pipeline of the hydrocarbon detection device (7), and the gas storage tank is also connected to the inlet pipeline of the hydrocarbon detection device (7); Connecting the outlet end of the hydrocarbon detection device (7) to the conversion line; The conversion circuit comprises a first pipeline (5) and a second pipeline (6), wherein the first pipeline (5) and the second pipeline (6) are arranged in parallel; A second gas conversion valve is provided on the first pipeline (5), and a third gas conversion valve and a nitrogen conversion device are provided on the second pipeline (6); The outlet end of the conversion line is connected to the nitrogen detection line.

2. The detection method for 5E-CHN200 element analyzer according to claim 1, characterized in that: A large purification chamber, a first flow sensor and a quantitative valve are arranged on the carrier gas passage (3).

3. The detection method for 5E-CHN200 element analyzer according to claim 1, characterized in that: The oxygen storage device is in communication with both the first oxygen gas path (2) and the second oxygen gas path (4), and a combustion tube and a filtering system are sequentially arranged on the second oxygen gas path (4) along the gas flow direction.

4. The detection method for 5E-CHN200 element analyzer according to claim 3, characterized in that: The combustion tube is configured in a U shape.

5. The detection method for 5E-CHN200 element analyzer according to claim 3, characterized in that: The second oxygen gas line (4) is connected to the gas storage tank.

6. The detection method for 5E-CHN200 element analyzer according to claim 1, characterized in that: The hydrocarbon detection device (7) comprises an H2O infrared cell, a CO2 infrared cell and a second flow sensor.

7. The detection method for 5E-CHN200 element analyzer according to claim 1, characterized in that: A second gas conversion valve and a sensor are sequentially arranged on the first pipeline (5) along the gas flow direction; and a third gas conversion valve, a reduction furnace and a small purification chamber are sequentially arranged on the second pipeline (6) along the gas flow direction.

8. The detection method for 5E-CHN200 element analyzer according to claim 1, characterized in that: A fourth gas switching valve, a fifth gas switching valve and a thermal conductivity cell are arranged on the nitrogen detection line; The fourth gas switching valve and the fifth gas switching valve are arranged in parallel; The fifth gas switching valve is connected in series with the thermal conductivity cell.

9. A detection method for 5E-CHN200 element analyzer according to claim 8, characterized in that: When detecting the C and H elements, the first gas conversion valve is adjusted so that the first oxygen gas path (2) is connected to the carrier gas path (3), the helium gas path (1) is closed, and the third gas conversion valve and the fifth gas conversion valve are closed at the same time, and the second gas conversion valve and the fourth gas conversion valve are opened.

10. The detection method for 5E-CHN200 element analyzer according to claim 8, characterized in that: When detecting the nitrogen element, the first gas conversion valve is adjusted to connect the helium gas path (1) with the carrier gas path (3), the first oxygen gas path (2) is closed, the second gas conversion valve and the fourth gas conversion valve are closed, and the third gas conversion valve and the fifth gas conversion valve are opened.

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