Acid gas component online analysis device

Abstract

The utility model relates to the technical field of on-line detection, and particularly discloses an acid gas component on-line analysis device which comprises a sampling pipeline connected with a sampling port, a sample return pipeline connected with a return port, and a detection pipeline used for connecting the sampling pipeline and the sample return pipeline and provided with a detection assembly, the detection assembly comprises an airflow separation tank, a filter group, a pressure regulator, a first three-way valve, a Fourier infrared analyzer and a pressure buffer tank which are sequentially arranged on the detection pipeline; the airflow separation tank is arranged between the filtering assembly and the sampling perfusion; the buffer tank is arranged between the Fourier infrared analyzer and the sample return pipeline; according to the utility model, the concentration condition of each component in the acid gas of the recovery device of the purification plant can be monitored in real time, and particularly, main components such as H2S, CO2, CH4 and the like can be monitored more accurately; timely and accurate technical support is provided for sulfur recovery process control of a purification plant; the control level of the production process is favorably adjusted and optimized, the sulfur recovery efficiency is improved, and the emission of SO2 in tail gas is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of on-line detection, and more specifically to an on-line analysis device for acid gas components. Background Art

[0002] Hydrogen sulfide (H2S) and other sulfur-containing compounds in natural gas. These sulfides are not only corrosive but can also pollute the environment. Therefore, removing sulfides is a crucial step in the natural gas purification process. The sulfur-containing gas produced by the desulfurization process, commonly known as acid gas, contains high concentrations of hydrogen sulfide. These gases are classified as secondary poisons and are highly hazardous, posing a significant safety risk to natural gas purification plants. Currently, the Claus process is widely used in industrial processing to convert the hydrogen sulfide in acid gas into elemental sulfur, achieving desulfurization and sulfur recovery. The basic process of the Claus process involves the complete combustion of hydrocarbons and the combustion of one-third of the hydrogen sulfide in a furnace to produce sulfur dioxide, which is then distributed with air. Therefore, accurate detection of acid gas components throughout the entire process is particularly important.

[0003] Currently, domestic natural gas purification plants rely primarily on manual sampling and laboratory testing to detect acid gas components. However, this method presents numerous challenges. Manual sampling and testing expose operators to high concentrations of toxic gases, posing significant safety risks. Due to the data lag associated with manual analysis, test results cannot be obtained in real time, hindering timely adjustments to production control. Manual operation inevitably introduces errors, impacting the accuracy and reliability of test results. The inability to measure acid gas concentrations in real time hinders timely adjustments to air distribution during the recovery process, impacting sulfur recovery process control and potentially causing excessive SO2 emissions in tail gas. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an online analysis device for acid gas components;

[0005] The solution adopted by the utility model to solve the technical problem is:

[0006] An acid gas component online analysis device includes a sampling pipeline connected to a sampling port, a sample return pipeline connected to a return port, and a detection pipeline for connecting the sampling pipeline and the sample return pipeline and provided with a detection component;

[0007] The detection assembly includes an airflow separation tank, a filter group, a pressure regulator, a first three-way valve, a Fourier infrared analyzer, and a pressure buffer tank, which are sequentially arranged on the detection pipeline; the airflow separation tank is arranged between the filter assembly and the sampling perfusion; the buffer tank is arranged between the Fourier infrared analyzer and the sample return pipeline;

[0008] The first three-way valve is connected to a range gas source and a zero point gas source.

[0009] In some possible implementations, the Fourier transform infrared analyzer is connected to an instrument air main via an air filter pressure reducing valve, and a first one-way valve is installed between the Fourier transform infrared analyzer and the pressure buffer tank.

[0010] In some possible embodiments, the filter assembly includes a T-type filter, which is connected to the input end of the pressure buffer tank through a fast loop pipeline; a second one-way valve and a second flow meter are provided on the fast loop pipeline; the second one-way valve is respectively connected to the Fourier infrared analyzer and the pressure buffer tank.

[0011] In some possible implementations, the filter assembly further includes a linear filter, and the linear filter is disposed between the airflow separation tank and the T-type filter.

[0012] In some possible implementations, an inlet flowmeter and a water-blocking filter are further provided at the input end of the Fourier transform infrared analyzer; the inlet flowmeter is provided between the first three-way valve and the water-blocking filter.

[0013] In some possible implementations, the bottom of the gas flow separation tank is further connected to a drain valve, and a visual tank is connected between the drain valve and the gas-liquid separation tank.

[0014] In some possible implementations, a second three-way valve is connected to the first three-way valve, and the second three-way valve is connected to a range gas source and a zero point gas source, respectively; a pressure gauge is provided between the range gas source / zero point gas source and the second three-way valve.

[0015] In some possible implementations, a ball valve 1 and a needle valve are provided at the output end of the pressure buffer tank, and the ball valve 1 is provided between the needle valve and the pressure buffer tank; a ball valve 2 is provided on the detection pipeline and between the airflow separation tank and the sampling pipeline.

[0016] In some possible implementations, an explosion-proof cabinet is further included, and the detection pipeline is located in the explosion-proof cabinet.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The utility model can monitor the concentration of each component in the acid gas of the purification plant recovery device in real time, especially the monitoring of the main components such as H2S, CO2, CH4 more accurately. The acquisition of such real-time data provides timely and accurate technical support for the sulfur recovery process control of the purification plant, and helps to adjust and optimize the production process control level, improve the sulfur recovery efficiency, and reduce SO2 emissions in the tail gas.

[0019] Acid gas with high hydrogen sulfide content enters from the sampling port, is detected in real time by the utility model, and then safely returned to the original pipeline of the recovery device. It does not consume sample gas, avoids the risk of external discharge, saves energy, and is suitable for long-term continuous online detection, eliminating the safety hazards of manual analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the utility model;

[0021] Among them: 1-sampling line, 2-return sample line, 3-air flow separation tank, 4-T-type filter, 5-linear filter, 6-pressure regulator, 7-first three-way valve, 8-Fourier infrared analyzer, 9-pressure buffer tank, 10-span gas source, 11-zero gas source, 12-air filter pressure reducing valve, 13-second three-way valve, 14-instrument air main, 15-first one-way valve, 16-fast loop pipeline, 17-second one-way valve, 18-second flowmeter, 19-inlet flowmeter, 20-water blocking filter, 21-drain valve, 22-explosion-proof cabinet, 23-through-plate joint, 24-drain port, 25-ball valve 1, 26-ball valve 2, 27-sampling port, 28-return port, 29-sight tank, 30-pressure gauge; 100-detection pipeline. DETAILED DESCRIPTION

[0022] In this application, unless otherwise specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integration; they can refer to direct connections or indirect connections through an intermediary; they can refer to internal communication between two components or interactions between two components. The terms "first," "second," and similar terms mentioned in this application do not denote any order, quantity, or importance; they are simply used to distinguish between different components. Similarly, terms such as "a" or "an" do not indicate a quantitative limitation; rather, they indicate the presence of at least one. In the implementation of this application, "and / or" describes an association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. In the description of the embodiments of this application, unless otherwise specified, "plurality" means two or more. For example, "plurality" refers to two or more positioning posts. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0023] The utility model is described in detail below.

[0024] Fourier infrared spectroscopy is an existing technology for substance detection, one of the key components of which is an interferometer. In this method, an infrared radiation light source passes through a sample chamber, molecules in the sample absorb light of a specific wavelength, forming an absorption spectrum. The light is divided into a sample light path and a reference light path, and then combined to form interference fringes. The interferometer adjusts the optical path difference to obtain infrared absorption spectra of different wave numbers, converts the optical path difference information into a frequency spectrum using Fourier transform, and then obtains the infrared absorption spectrum of the sample, and performs optical quantitative analysis of the concentration of the substance based on the Beer-Lambert law. It has the advantages of high sensitivity, high resolution and real-time monitoring.

[0025] As shown in Figure 1 An acid gas component on-line analysis device, comprising a sampling pipeline 1 and a return pipeline 2, a detection pipeline 100 for connecting the sampling pipeline 1 and the return pipeline 2, a detection assembly installed on the detection pipeline 100, and an explosion-proof cabinet body 22 for installing the detection pipeline 100; the detection assembly comprises a gas flow separation tank 3, a filter assembly, a pressure regulator 6, a first three-way valve 7, a Fourier infrared analyzer 8 and a pressure buffer tank 9 connected in sequence;

[0026] The first three-way valve 7 is connected with a range gas source 10 and a zero point gas source 11, and the range gas source 10 and the zero point gas source 11 are located outside the explosion-proof cabinet body 22; the Fourier infrared analyzer 8 is connected with an instrument air main pipe 14 through an air filter pressure reducing valve 12; a first one-way valve 15 is installed on the pipeline between the Fourier infrared analyzer 8 and the pressure buffer tank 9;

[0027] In this embodiment, the filter assembly comprises a T-shaped filter 4, wherein the T-shaped filter 4 is connected with the input end of the pressure buffer tank 9 through a quick loop pipeline 16; a second one-way valve 17 and a second flow meter 18 are arranged on the quick loop pipeline 16;

[0028] The filter assembly further comprises a linear filter 5, which is connected in series with the T-shaped filter 4 on the pipeline in front of the pressure regulator 6, i.e. between the gas flow separation tank 3 and the pressure regulator 6, wherein the linear filter 5 is arranged between the gas flow separation tank 3 and the T-shaped filter 4.

[0029] The detection pipeline 100, the gas flow separation tank 3, the filter, the pressure regulator 6, the first three-way valve 7, the Fourier infrared analyzer 8 and the pressure buffer tank 9 are all located inside the explosion-proof cabinet body 22;

[0030] The sampling pipeline 1 and the return pipeline 2 are connected with the detection pipeline 100 through a through-plate joint 23 on the explosion-proof cabinet body 22;

[0031] An air conditioner is also installed outside the explosion-proof cabinet body 22 to adjust the temperature inside it, so as to meet the working temperature of the Fourier infrared analyzer 8;

[0032] Acid gas with high hydrogen sulfide content enters from the sampling port 27, enters the detection pipeline 100, is detected online by the Fourier infrared analyzer 8, and then safely returns to the original pipeline of the desulfurization process device. It not only does not consume samples, is green and environmentally friendly, saves energy, but is also suitable for long-term continuous online detection.

[0033] The sampling pipeline 1 adopts an integrated φ8 electric heating pipeline to ensure that the sample gas and the environment meet the instrument working temperature (15℃-35℃). It can not only avoid the fluctuation of gas concentration caused by temperature changes, but also prevent the low temperature conditions caused by the environment or pressure from condensing the sample gas and clogging the pipeline.

[0034] Before the sample gas (acid gas) enters the explosion-proof cabinet 22, it is first dehydrated. A stainless steel gas-liquid separation tank 3, a visual tank 29, and a drain valve 21 are set. The gas-liquid separation tank 3, the visual tank 29, and the drain valve 21 are connected in sequence. The sample gas enters the gas-liquid separation tank 3 and undergoes a sample gas impurity removal process.

[0035] By setting up a linear filter 5 and a T-type filter 4, the sample gas after impurities removal enters the T-type filter 4 through the linear filter 5. The T-type filter 4 transports part of the sample gas to the fast loop pipeline 16 through the second one-way valve 17, thereby accelerating the flow rate of the sample gas for detection. The second flowmeter 18 set on the fast loop pipeline 16 can be used to detect the sample gas pressure passing through the second one-way valve 17.

[0036] An inlet flow meter 19 and a water blocking filter 20 are also provided at the input end of the Fourier infrared analyzer 8, wherein the water blocking filter 20 is provided between the inlet flow meter 19 and the first three-way valve 7;

[0037] By setting a water-blocking filter 20, the test sample gas is effectively guaranteed to be pure and free of water;

[0038] A pressure regulator 6 is provided between the T-type filter 4 and the first three-way valve 7 , which cooperates with the inlet flow meter 19 to avoid measurement errors caused by the sample gas flow rate and pressure, and ensure the stability of the sample gas.

[0039] After the sample gas successfully enters the Fourier infrared analyzer 8 for automated testing, the safe reflux of the sample gas is ensured, the sample gas is not consumed, energy is saved and emissions are reduced, so as to ensure the long-term continuous operation of the utility model. A first one-way valve 15 and a pressure buffer tank 9 are provided at the output end of the Fourier infrared analyzer 8, wherein the first one-way valve 15 is provided between the pressure buffer tank 9 and the Fourier infrared analyzer 8;

[0040] The connection point between the fast loop pipeline 16 and the detection pipeline 100 is provided between the first one-way valve 15 and the pressure buffer tank 9; a needle valve 26 and a ball valve 1 251 are provided at the output end of the pressure buffer tank 9, and the needle valve 26 is provided between the ball valve 1 251 and the pressure buffer tank 9; a ball valve 252 is provided at the input end of the airflow separation tank 3;

[0041] In order to ensure the accurate measurement of the sample gas spectrum, it is necessary to regularly perform zero point and span calibration, set the first three-way valve 7 and the second three-way valve 13, and lead to the span gas and zero point gas (high-purity nitrogen) outside the explosion-proof cabinet 22, so as to facilitate later replacement; at the same time, in order to ensure the stable operation of the interferometer, the core component of the Fourier transform infrared analyzer 8, and to calibrate and correct the sample spectrum, it is necessary to separately set an instrument air main pipe 14 and an air filter pressure reducing valve 12 for it outside the explosion-proof cabinet 22, wherein the air filter pressure reducing valve 12 is arranged between the instrument air main pipe 14 and the Fourier transform infrared analyzer 8, and the air in the external environment is introduced into the Fourier transform infrared analyzer 8 as a background reference and benchmark, and clean air is passed into the Fourier transform infrared analyzer 8 before shutdown;

[0042] In this embodiment, the span gas source 10 and the zero gas source 11 are connected to the first three-way valve 7 through the second three-way valve 13; in order to perform zero point calibration and span calibration regularly, the second three-way valve 13 is used to connect the span gas source 10 and the zero gas source 11 (high-purity nitrogen).

[0043] In this utility model, the zero point calibration process is:

[0044] First, the sampling line 1 needs to be closed to ensure that no new sample gas enters the utility model;

[0045] Switch to the zero-point gas source 11 and operate the second three-way valve 13 to switch the sampling line 1 to the zero-point gas source 11 (high-purity nitrogen) and introduce the zero-point gas.

[0046] Allow the zero point gas source 11 (high purity nitrogen) to flow into the present invention through the first three-way valve 7 to replace the gas currently in the present invention. Adjust the Fourier transform infrared analyzer 8: According to the operation display of the Fourier transform infrared analyzer 8, adjust the Fourier transform infrared analyzer 8 to the zero point calibration mode;

[0047] Calibrate and set the zero point: The Fourier transform infrared analyzer 8 will read the concentration value of the current zero point gas. When the concentration value of the zero point gas source 11 is stable (theoretically, it should be 0 or close to 0), the value is set as the zero point on the Fourier transform infrared analyzer 8; complete the zero point calibration: after confirming that the zero point is set correctly, the zero point calibration is completed.

[0048] Span calibration, turn off the zero gas source 11;

[0049] Before span calibration, ensure that the zero gas source 11 is turned off;

[0050] Switch to the span gas source 10, operate the second three-way valve 13 again, and switch the utility model from the zero point gas source 11 to the span gas source 10 (containing a standard gas of known concentration).

[0051] Introduce the range gas source 10: allow the range gas source 10 to flow into the utility model through the first three-way valve 7 to replace the gas currently in the utility model;

[0052] Adjust the Fourier transform infrared analyzer 8, and adjust the Fourier transform infrared analyzer 8 to a range calibration mode according to the operation display of the Fourier transform infrared analyzer 8;

[0053] Read and set the range: The Fourier transform infrared analyzer 8 will read the concentration value of the current range gas. When the concentration value of each component of the range gas is stable, it will be compared with the known standard value. The operator will be prompted to enter or confirm the range value. Complete the range calibration:

[0054] When the Fourier transform infrared analyzer 8 confirms that the range setting is correct, the range calibration is completed.

[0055] Among them, the Fourier infrared analyzer refers to the JJF1362-2012 Flue Gas Analyzer Type Evaluation Outline Standard, and the spectral range is 5000-900cm -1 , the spectral resolution is 1cm -1 The interference part adopts helium-neon laser, which has higher wavelength stability than semiconductor lasers. The all-metal multiple-reflection high-temperature gold-plated gas chamber is corrosion-resistant, with a gas chamber temperature of 50°C, an operating temperature range of (15-35)°C, and a power supply of 220VAC±10% / peak of 2500W.

[0056] In this embodiment, the bottom of the air flow separation tank 3 is also connected to a drain valve 21, which is a ball valve. A stainless steel visual tank 29 is also connected between the drain valve 21 and the gas-liquid separator 3, which can be used to store liquid. The liquid level in the tank can be observed through the visual window and discharged and transferred in time through the drain valve 21.

[0057] Pressure gauges 30 are respectively installed on the pipelines connecting the span gas source 10 and the zero point gas source 11 with the second three-way valve 13 for detecting the gas source pressure.

[0058] A drain port 24 is also provided at a corresponding position of the explosion-proof cabinet 22 , and the drain port 24 is connected to the drain valve 21 through a pipeline.

[0059] The sampling and sample gas processing system is designed to ensure the normal operation of the analyzer. The sample gas to be tested needs to meet the temperature, pressure, flow and other conditions suitable for the instrument.

[0060] Acid gas high in hydrogen sulfide undergoes a series of sample treatments starting at sampling port 27, undergoes online testing using a Fourier transform infrared analyzer 8, and is then safely returned to the recovery unit's original pipeline. This eliminates sample gas consumption, avoids the risk of external emissions, saves energy, and is suitable for long-term, continuous online testing. The advantage of this device lies in its ability to provide real-time information on the concentrations of various components in the acid gas from natural gas purification plants, particularly accurately monitoring key components such as H2S, CO2, and CH4. This real-time data acquisition provides timely and accurate technical support for sulfur recovery process control in purification plants, helping to adjust and optimize production process control, improve sulfur recovery efficiency, and reduce tail gas SO2 emissions.

[0061] 1. This utility model adopts Fourier infrared spectroscopy analysis technology to achieve accurate online analysis of acid gas components, and has the characteristics of high sensitivity and high resolution.

[0062] 2. The utility model has a multiple filtering mechanism, which realizes multiple filtering and precise flow control of the sample gas by connecting a T-type filter and a linear filter in series, and arranging a second one-way valve 16 and a second flow meter 18 on the fast loop pipeline 16.

[0063] 3. The utility model utilizes the air flow separation tank 3 and the drain valve 21 at the bottom thereof to ensure that the separated liquid is discharged in time, thereby ensuring continuous operation and the purity of the sample gas.

[0064] 4. The utility model effectively solves the problem of condensation of sample gas by adopting electric heating pipeline to prevent condensation of gas during sampling and ensure the integrity of the sample.

[0065] 5. The present invention can remove the influence of moisture on the analysis accuracy. By providing a water-blocking filter 20 at the input end of the Fourier infrared analyzer 8, moisture in the gas can be effectively removed, thereby protecting the Fourier infrared analyzer 8 and improving the accuracy of the data.

[0066] 6. The utility model can effectively enhance the control of gas flow and direction, and is equipped with multiple one-way valves and flow meters to achieve precise control and directional management of gas flow, thereby enhancing stability and reliability.

[0067] 7. The present invention improves explosion-proof safety by placing the detection pipeline 100 inside the explosion-proof cabinet 22 and connecting it through the through-plate connector 23, thereby ensuring safe operation in a hazardous environment.

[0068] 8. The utility model adopts a Fourier infrared analyzer 8, which can detect low-concentration acid gas components; Fourier infrared spectroscopy technology provides high-resolution spectral data, which can distinguish subtle composition differences; through the inlet flow meter 19 and the second flow meter 18, precise adjustment of the gas flow is achieved; multiple filtering mechanisms ensure the purity of the sample gas and effectively remove impurities and moisture.

[0069] The present invention is not limited to the aforementioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. An acid gas component online analysis device, characterized in that: It includes a sampling pipeline connected to the sampling port, a sample return pipeline connected to the return port, and a detection pipeline used to connect the sampling pipeline and the sample return pipeline and provided with a detection component; The detection assembly includes an airflow separation tank, a filter group, a pressure regulator, a first three-way valve, a Fourier infrared analyzer, and a pressure buffer tank, which are sequentially arranged on the detection pipeline; the airflow separation tank is arranged between the filter assembly and the sampling perfusion; the buffer tank is arranged between the Fourier infrared analyzer and the sample return pipeline; The first three-way valve is connected to a range gas source and a zero point gas source.

2. The acid gas component online analysis device according to claim 1, characterized in that: The Fourier transform infrared analyzer is connected to an instrument air main pipe through an air filter pressure reducing valve, and a first one-way valve is installed between the Fourier transform infrared analyzer and the pressure buffer tank.

3. The on-line acid gas component analysis device according to claim 1, characterized in that: The filter assembly includes a T-type filter, which is connected to the input end of the pressure buffer tank through a fast loop pipeline; a second one-way valve and a second flow meter are provided on the fast loop pipeline; the second one-way valve is connected to the Fourier infrared analyzer and the pressure buffer tank respectively.

4. The on-line acid gas component analysis device according to claim 3, characterized in that: The filter assembly further comprises a linear filter, which is arranged between the airflow separation tank and the T-type filter.

5. The on-line acid gas component analysis device according to claim 1, characterized in that: An inlet flow meter and a water-blocking filter are also provided at the input end of the Fourier infrared analyzer; the inlet flow meter is provided between the first three-way valve and the water-blocking filter.

6. The on-line acid gas component analysis device according to claim 5, characterized in that: The bottom of the airflow separation tank is also connected to a drain valve, and a visual tank is connected between the drain valve and the gas-liquid separation tank.

7. The acid gas component online analysis device according to claim 1, characterized in that: A second three-way valve is connected to the first three-way valve, and the second three-way valve is connected to a range gas source and a zero point gas source respectively; a pressure gauge is provided between the range gas source / zero point gas source and the second three-way valve.

8. The on-line acid gas component analysis device according to claim 5, characterized in that: A ball valve 1 and a needle valve are provided at the output end of the pressure buffer tank, and the ball valve 1 is provided between the needle valve and the pressure buffer tank; a ball valve 2 is provided on the detection pipeline and between the airflow separation tank and the sampling pipeline.

9. The on-line acid gas component analysis device according to claim 1, characterized in that: It also includes an explosion-proof cabinet, and the detection pipeline is located in the explosion-proof cabinet.

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