Modularized online analysis instrument for technological process control

Abstract

The invention belongs to the technical field of online analysis instruments, and particularly discloses a modular online analysis instrument for technological process control, which comprises a modular sampling probe, an optical fiber and a transmitter, the modularized sampling probe is connected with a process pipeline and comprises a probe body and a sampling pipe connected to the lower portion of the probe body, an ascending channel and a descending channel are arranged in the sampling pipe, one end of the ascending channel and one end of the descending channel are arranged at the end of the sampling pipe to form a sampling opening, and the other ends penetrate into an inner cavity of the probe body to form a measuring pool. Two ends of the measuring cell are respectively connected with the transmitting unit optical fiber connector and the receiving unit optical fiber connector; the detection module of the transmitter comprises at least one light source and a detector, the light source is connected with the transmitting unit optical fiber connector through an optical fiber, and the detector is connected with the receiving unit optical fiber connector through an optical fiber. According to the instrument, a sample pretreatment system is omitted, the lag time is remarkably shortened, the equipment cost and the maintenance complexity are reduced, meanwhile, waste gas emission is reduced, and green, environment-friendly and efficient detection is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of on-line analytical instruments, and particularly to a modular on-line analytical instrument for process control. Background Art

[0002] Traditional on-line analytical instruments are widely used in process control such as petrochemical industry, but their working methods have many drawbacks. Specifically, traditional on-line analytical instruments need to draw process gas from the sampling probe and transport it through the sample transmission pipeline to the analytical cabinet far from the sampling point. In the analytical cabinet, the sample needs to go through a series of complex pretreatment operations, including filtration, pressure and temperature regulation, flow control, and reducing the lag time through bypass. This process not only significantly increases the lag time, but also brings many problems due to the waste gas emissions generated during the sample treatment process and the tail gas emissions after the instrument monitoring is vented.

[0003] Many process media have dangerous characteristics such as toxicity, flammability, and explosiveness. The transmission, emission, and collection of their waste gases not only increase the environmental pollution risk, but also cause resource waste and the increase of construction and maintenance costs. In addition, in order to ensure a constant sample temperature and prevent condensation, the sample pretreatment system of traditional on-line analytical instruments usually needs to be installed in a thermally insulated cabinet. In the chemical industry, due to explosion-proof requirements, the cabinet needs to be equipped with explosion-proof electric heaters, lamps, power supplies, and signal junction boxes, and the sample transmission pipeline also needs to adopt explosion-proof electric tracing measures. According to different environmental conditions, some cabinets also need to be equipped with explosion-proof fans, explosion-proof air conditioners and other equipment. When multiple instruments are installed centrally, a relatively large analytical hut needs to be configured, and explosion-proof air conditioners, explosion-proof fans, explosion-proof gas detectors, and safety alarm control systems need to be installed in the hut. These additional devices not only increase the equipment investment cost, but also greatly increase the later maintenance workload and maintenance cost.

[0004] In the process of building an internationally advanced green petrochemical industry system, it is required that the petrochemical industry transform to an efficient, low-carbon, and circular green development model. The above-mentioned technical problems existing in traditional on-line analytical instruments obviously do not conform to the development trend of the industry and are not conducive to reducing resource waste, environmental pollution, improving production efficiency and safety. Therefore, there is an urgent need for a modular on-line analytical instrument for process control. Summary of the Invention

[0005] The purpose of the present invention is to provide a modular on-line analytical instrument for process control to solve the above problems existing in the prior art.

[0006] To achieve the above object, the present invention provides the following solution: A modular on-line analyzer for process control, comprising a modular sampling probe, an optical fiber, and a transmitter; the modular sampling probe is connected to a process pipeline, and includes a probe body and a sampling pipe connected below the probe body. The sampling pipe has a rising channel and a falling channel therein. One end of the rising channel and the falling channel is provided at the end of the sampling pipe to form a sampling port, and the other end penetrates through to the inner cavity of the probe body to form a measurement cell. Both ends of the measurement cell are respectively connected to a transmitting unit optical fiber connector and a receiving unit optical fiber connector; the transmitter includes a detection module composed of at least one light source and a detector. The light source is connected to the transmitting unit optical fiber connector through an optical fiber, and the detector is connected to the receiving unit optical fiber connector through another optical fiber.

[0007] In some alternative embodiments of the present invention, light-transmitting windows are hermetically installed at the positions where both ends of the measurement cell are connected to the transmitting unit optical fiber connector and the receiving unit optical fiber connector.

[0008] In some alternative embodiments of the present invention, the light-transmitting windows are sapphire windows detachably installed at both ends of the probe body.

[0009] In some alternative embodiments of the present invention, a calibration gas port is connected to one side of the probe body, and the calibration gas port is connected to the measurement cell through an internal pipeline.

[0010] In some alternative embodiments of the present invention, the modular sampling probe further includes a root valve, and the root valve is installed at a position of the sampling pipe close to the sampling port.

[0011] In some alternative embodiments of the present invention, an explosion-proof heater is installed on the probe body, and the explosion-proof heater includes a heating element, a temperature sensor, and a heater housing.

[0012] In some alternative embodiments of the present invention, a mounting flange is provided at the position where the probe body is connected to the sampling pipe. The sampling pipe is connected to the mounting flange through a ferrule seal joint. One end of the ferrule seal joint is bolted to the mounting flange, and the other end is connected to the sampling pipe through a sealing ferrule. The ferrule seal joint adopts a double-ferrule structure.

[0013] In some alternative embodiments of the present invention, the sealing ferrule is made of an elastic material, and by its elastic deformation, it is circumferentially pressed against the outer wall of the sampling pipe.

[0014] In some alternative embodiments of the present invention, the transmitter includes an explosion-proof housing, a display module, a power supply module, an input / output module, a control module, and a detection module.

[0015] In some alternative embodiments of the present invention, the transmitter further includes an analysis module, which configures different functional sub-modules according to detection requirements, and the functional sub-modules include at least one of an infrared module, an ultraviolet module, and a laser module.

[0016] Compared with the prior art, the present invention discloses at least the following beneficial effects:

[0017] The modular on-line analyzer does not need to take out the sample, and omits the sample pretreatment system, which not only greatly shortens the lag time, but also significantly reduces the equipment investment cost and the complexity of operation and maintenance. At the same time, since there is no need to extract the process medium, the emission of waste gas and waste liquid generated during the sample treatment process by the traditional on-line analyzer is avoided, environmental pollution is reduced, costs are saved, and green environmental protection is achieved. In addition, the modular on-line analyzer does not require other auxiliary equipment, further reducing equipment investment and the complexity of operation and maintenance, and effectively avoiding many technical defects brought by the traditional on-line analyzer due to complex equipment and systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 is the structure of the modular on-line analyzer for process control of the present invention Figure 1 ;

[0020] Figure 2 is the structure of the modular on-line analyzer for process control of the present invention Figure 2 ;

[0021] Figure 3 is a schematic structural diagram of the on-site modular probe in the modular on-line analyzer of the present invention;

[0022] Figure 4 is a cross-sectional view of the on-site modular probe in the modular on-line analyzer of the present invention;

[0023] Figure 5 is Figure 4 a partial enlarged view of part A in

[0024] Figure 6 is a cross-sectional view of the on-site modular probe of the present invention in a state of cooperation with a process pipeline;

[0025] Figure 7Schematic diagram of the modular on-line analyzer for process control of the present invention;

[0026] Figure 8 It is the structural diagram of a traditional on-line analyzer.

[0027] In the figure: 1. Modular sampling probe; 2. Optical fiber; 3. Transmitter; 4. Process pipeline; 11. Probe body; 12. Optical fiber connector of the transmitting unit; 13. Optical fiber connector of the receiving unit; 14. Ferrule seal joint; 15. Mounting flange; 16. Sampling pipe; 17. Sampling port; 18. Explosion-proof heater; 19. Window compression nut; 20. First window gasket; 21. Sapphire window; 22. Second window gasket; 23. Measuring cell; 24. Sealing ferrule; 25. Rising channel; 26. Falling channel; 27. Standard gas port; 28. Root valve; 31. Explosion-proof housing; 32. Display module; 33. Power supply module; 34. Input / output module; 35. Control module; 36. Detection module; 37. Light source; 38. Detector. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] There are many problems with traditional on-line analyzers, such as Figure 8 As shown, the traditional on-line analyzer needs to draw out the process gas from the sampling probe and transport it through the sample transmission pipeline to the analysis cabinet far from the sampling point. The sample is filtered by the sample pretreatment system in the analysis cabinet, and the pressure, temperature, and flow are adjusted. After a series of operations such as reducing the lag time through the bypass, it is sent to the on-line analyzer and then discharged through the vent pipeline. This process not only has a very long lag time, but also waste gas is generated in the sample treatment process through the bypass and needs to be discharged. The instrument also monitors and discharges the tail gas after venting. Many process media are toxic, flammable, explosive gases, liquids, and the transmission, discharge, and collection of waste gas will cause environmental pollution, waste of resources, and increased costs (construction, maintenance).

[0030] The sample pretreatment system of traditional on-line analyzers is designed to ensure a constant temperature of the medium to be measured, prevent condensation, prevent phase change of the medium leading to separation, prevent high-temperature polymerization, prevent low-temperature crystallization, etc. To ensure the cleanliness of the sample, multi-stage filtration is required. For samples with a high water content, water needs to be removed to prevent condensation inside the instrument. To facilitate the transmission and measurement of the sample, the temperature and pressure need to be controlled. For high-temperature samples, cooling is required to enable the components to withstand the temperature. For low-temperature samples, heat preservation during transmission is needed to prevent phase change and ensure that the components of the medium to be measured remain unchanged. For high-pressure samples, pressure reduction is required for safe transportation. For low-pressure samples, pressure needs to be increased to facilitate transportation to the sample pretreatment system. To meet the above requirements, utility engineering conditions such as instrument air, plant nitrogen, demineralized water, and steam are introduced at the sample pretreatment system, resulting in many vulnerable parts and spare parts. Sometimes, the complexity, cost, and maintenance workload of the sample pretreatment system exceed those of the instrument.

[0031] To ensure the operability of traditional on-line analyzers, the on-line instrument and the pretreatment system need to be installed in a heat-insulated cabinet. In the chemical industry, most areas are explosion-proof. The cabinet needs to be equipped with explosion-proof electric heaters, lamps, power supplies, and signal junction boxes. The sample transmission pipeline requires explosion-proof electric tracing. Depending on the environmental conditions, some cabinets are equipped with explosion-proof fans and explosion-proof air conditioners. When multiple instruments are installed together, a relatively large analysis hut needs to be configured. For the safety of personnel and equipment, the analysis hut needs to be installed with explosion-proof air conditioners, explosion-proof fans, explosion-proof gas detectors, and a safety alarm control system.

[0032] In summary, traditional on-line analyzers have many problems. To solve the above problems, the embodiments of the present invention propose a modular on-line analytical instrument. Through innovative structural design, many drawbacks of traditional on-line analyzers can be avoided. The modular on-line analytical instrument does not need to extract the process medium, thus greatly shortening the lag time, reducing the discharge of waste liquid and waste gas, saving costs, and achieving the goal of green environmental protection. At the same time, since there is no need to set up a complex sample pretreatment system, the modular on-line analytical instrument reduces the equipment investment cost and the complexity of operation and maintenance, reduces the occupied space of the equipment, and improves the safety and reliability. These characteristics make the modular on-line analytical instrument highly compatible with the goal of promoting the green transformation of the petrochemical industry in the country, providing strong support for the realization of an efficient, low-carbon, and circular green petrochemical industry system.

[0033] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Refer to Figures 1 to 6As shown in the figure, the present invention provides a modular on-line analytical instrument for process control, including a modular sampling probe 1, an optical fiber 2, and a transmitter 3. The modular sampling probe 1 is connected to the process pipeline 4 through a mounting flange 15 and is connected to the optical fiber 2 through an optical fiber connector; the optical fiber 2 serves as a signal transmission medium, with one end connected to the light source 37 and the detector 38 in the transmitter 3, and the other end connected to the transmitting unit and the receiving unit of the modular sampling probe 1; the transmitter 3 serves as the core processing unit, is connected to the modular sampling probe 1 through the optical fiber 2, completes signal transmission, reception, and data processing, and transmits the data remotely to the control center.

[0035] In the above embodiment, the modular sampling probe 1 includes a probe body 11 and a sampling pipe 16 connected below the probe body 11. The sampling pipe 16 is used for medium diversion. The interior of the sampling pipe 16 is divided into a rising channel 25 and a falling channel 26. One ends of the rising channel 25 and the falling channel 26 are arranged at the end of the sampling pipe 16 to form a sampling port 17, and the other ends penetrate through to the inner cavity of the probe body 11 to form a measurement cell 23. The sampling pipe 16 is connected to the probe body 11. The rising channel 25 is connected to the inner cavity of the probe body 11, and the falling channel 26 is also connected to the inner cavity of the probe body 11. The positions where the rising channel 25, the falling channel 26, and the probe body 11 are connected form a cavity to form the measurement cell 23. Both ends of the measurement cell 23 are respectively connected to a transmitting unit optical fiber connector 12 and a receiving unit optical fiber connector 13 for connecting the optical fiber 2. The transmitting unit located at one end of the measurement cell 23 is connected to the light source 37 in the transmitter 3 through the optical fiber 2, and the receiving unit located at the other end of the measurement cell 23 is connected to the detector 38 in the transmitter 3 through the optical fiber 2. The light of the transmitting unit passes through the measurement cell 23 to reach the receiving unit, irradiating the medium in the measurement cell 23 to complete on-line detection.

[0036] In a specific embodiment, the sampling pipe 16 is hermetically connected to the process pipeline 4. The medium to be measured in the process pipeline 4 enters the measurement cell 23 through the rising channel 25 of the sampling pipe 16 and then returns to the process pipeline 4 through the falling channel 26; at both ends of the measurement chamber of the modular sampling probe 1, there are a transmitting unit and a receiving unit respectively. The light source 37 and the detector 38 in the transmitter 3 are respectively connected to the transmitting unit and the receiving unit through the optical fiber 2; the light emitted from the transmitting unit passes through the measurement chamber, is absorbed by the gas to be measured, and the unabsorbed light reaches the detector 38 through the receiving unit. The detector 38 determines the content of the component to be measured in the process medium, and after being displayed by the transmitter 3 and remotely transmitting the data to the control center, the data collection in the process control process is completed.

[0037] In a specific embodiment, sapphire windows 21 are installed at the positions where the two ends of the measurement cell 23 are connected to the transmitting unit optical fiber connector 12 and the receiving unit optical fiber connector 13 to form a seal and prevent medium leakage. The light rays of the transmitting unit optical fiber connector 12 and the receiving unit optical fiber connector 13 enter and leave the measurement cell 23 through the sapphire windows 21. The selection of the sapphire windows 21 is based on their good optical transparency and chemical stability, and they can withstand the pressure and temperature of the process medium. The light rays emitted by the light source 37 are transmitted through the optical fiber 2 to the transmitting unit optical fiber connector 12, and then enter the measurement cell 23 through the sapphire windows 21. The light rays pass through the medium in the measurement cell 23, and part of the light rays are absorbed by the gas to be measured. The unabsorbed light rays reach the receiving unit optical fiber connector 13 through the sapphire windows 21, and then are transmitted through the optical fiber 2 to the detector 38.

[0038] In a specific embodiment, the seal between the measurement cell 23 and the environment is achieved through the window gasket. When installing the sapphire windows 21, first, a first window gasket 20 is installed on the sealing surfaces at both ends of the probe body 11, then the sapphire windows 21 are installed, followed by the installation of a second window gasket 22, and finally, it is tightened by the window compression nut 19. By adopting the above detachable installation method, it is convenient to select and install windows made of different materials according to different measurement media or light sources 37.

[0039] In a specific embodiment, a calibration gas port 27 is connected to one side of the probe body 11 for introducing calibration gas. The calibration gas port 27 is connected to the measurement cell 23 through an internal pipeline and can introduce the calibration gas into the measurement cell 23. In practical applications, the calibration gas port 27 is mainly used to calibrate and verify the accuracy of the analytical instrument. By regularly introducing calibration gas with a known concentration, the detector 38 module can be calibrated to ensure the reliability of the measurement results. In addition, the calibration gas port 27 is also used to verify the measurement accuracy of the analytical instrument. When the measurement results are abnormal, it can be quickly verified through the calibration gas port 27 to determine whether it is an instrument failure or other reasons that cause the deviation. This design not only improves the measurement accuracy but also enhances the reliability and maintenance efficiency of the equipment.

[0040] In a specific embodiment, the modular sampling probe 1 further includes a root valve 28. The root valve 28 is installed at a position of the sampling pipe 16 close to the sampling port 17 and is a key component for controlling the process medium to enter the sampling pipe 16. It is connected to the process pipeline 4 through a flange or a thread and can precisely adjust the flow rate of the medium entering the sampling pipe 16. During the operation of the equipment, the root valve 28 can control the flow rate to adapt to different process conditions, ensuring the stability and accuracy of the measurement process. In addition, the root valve 28 also has an on-off control function and can cut off or open the passage of the medium, facilitating the maintenance and calibration operations of the equipment. In case of an emergency, the root valve 28 can quickly close to cut off the medium supply, prevent leakage, and ensure the safety of the equipment and the operators. This design not only improves the flexibility and safety of the equipment but also reduces the maintenance cost and operation risk.

[0041] In a specific embodiment, an explosion-proof heater 18 is installed on the probe body 11. The explosion-proof heater 18 is a key component in the modular on-line analyzer and is installed on the probe body 11 of the modular sampling probe 1, specifically at a position close to the measurement cell 23. Its structure includes a heating element, a temperature sensor, and a heater housing. The heating element is used to provide heat, the temperature sensor is used to monitor the temperature in the measurement cell 23 in real time, and the heater housing ensures the safety of the equipment in an inflammable and explosive environment. The explosion-proof heater 18 is fixed on the probe body 11 by bolts or other mechanical means and is connected to the power supply module 33 in the transmitter 3 through a cable to obtain power from the power supply module 33. At the same time, its temperature sensor is connected to the control module 35 in the transmitter 3 through a signal line. The control module 35 adjusts the working state of the heater according to the feedback signal of the temperature sensor to achieve precise temperature control. The main function of the explosion-proof heater 18 is to prevent the process medium in the measurement cell 23 from condensing due to temperature drop, maintain the stability of the medium temperature, and ensure the accuracy and stability of the measurement. In addition, the heater housing adopts an explosion-proof design, and its explosion-proof design complies with relevant standards and can operate safely in a dangerous environment, ensuring the safety of the equipment and the operators.

[0042] In a specific embodiment, the sampling pipe 16 is connected to the mounting flange 15 through a ferrule seal joint 14. The ferrule seal joint 14 is arranged between the sampling pipe 16 and the mounting flange 15 and is used to connect the sampling pipe 16 and the mounting flange 15. Specifically, the ferrule seal joint 14 seals the sampling pipe 16 through a sealing ferrule 24. One end of the sampling pipe 16 is inserted into the inner hole of the ferrule seal joint 14, and the sampling pipe 16 is tightly connected to the ferrule seal joint 14 through the sealing ferrule 24 to ensure the sealing performance. The other end of the ferrule seal joint 14 is connected to the mounting flange 15, and the mounting flange 15 is fixed to the flange of the process pipeline 4 by bolts to realize the connection between the entire modular sampling probe 1 and the process pipeline 4.

[0043] In a specific embodiment, the sealing ferrule 24 is made of an elastic material. Through its elastic deformation, it tightly wraps around the outer wall of the sampling tube 16 to form a seal. This sealing method can effectively prevent the medium from leaking through the gap between the sampling tube 16 and the ferrule seal joint 14. The materials of the ferrule seal joint 14 and the sealing ferrule 24 usually have relatively high strength and pressure resistance, and can withstand the high-pressure medium in the process pipeline 4. This design ensures that the connection between the sampling tube 16 and the mounting flange 15 will not become loose or leak due to pressure in a high-pressure environment.

[0044] In a specific embodiment, the ferrule seal joint 14 adopts a double-ferrule structure, which makes the disassembly and assembly of the sampling tube 16 more convenient. When it is necessary to maintain or replace the sampling tube 16, it can be quickly disassembled and reinstalled, improving the maintenance efficiency.

[0045] It should be understood that in practical applications, the modular sampling probe 1 can be configured with different specifications of flanges according to the size of the process pipeline 4, so as to meet the installation requirements of on-site sampling points.

[0046] It should also be understood that the modular on-line analyzer for process control in this embodiment can be configured with a single detector 38 or multiple detectors 38 according to different analysis requirements to meet the requirements of on-site single-component or multi-component analysis.

[0047] In the above embodiment, the transmitter 3 is the core component of the modular on-line analyzer. Its internal structure includes an explosion-proof housing 31, a display module 32, a power module 33, an input / output module 34, a control module 35, and a detection module 36. The explosion-proof housing 31 is used to protect the internal components and ensure the safety of the device in an explosion-proof environment; the display module 32 is used to display measurement data and device status information; the power module 33 provides power support for each module in the transmitter 3; the input / output module 34 is responsible for data input and output, including communication with external devices; the control module 35 is used to control the operation of the entire transmitter 3, process data, and coordinate the work of each module; the detection module 36 includes a light source 37 and a detector 38, which are used to emit and receive light to detect the content of the component to be measured in the process medium.

[0048] The light source 37 is connected to the transmitting unit fiber optic connector 12 through the optical fiber 2. The light emitted by the light source 37 is transmitted through the optical fiber 2 to the transmitting unit fiber optic connector 12 of the on-site modular probe. The detector 38 is connected to the receiving unit fiber optic connector 13 through the optical fiber 2. The detector 38 receives the light transmitted from the receiving unit fiber optic connector 13 of the on-site modular probe through the optical fiber 2. The control module 35 receives the data transmitted from the detection module 36 and processes it. The processed data is sent to the display module 32 for display through the control module 35 and is remotely transmitted to the control center through the input / output module 34.

[0049] In a specific embodiment, the transmitter 3 can be configured with an analysis module. The analysis module sets different functional sub-modules according to different analysis components, such as sub-modules with different principles and functions like infrared module, ultraviolet module, laser module, etc. Specifically, single-module or multi-module combination configuration is performed according to requirements to analyze various gases such as CO2, CO, water, H2S, SO2, CH4, etc.

[0050] The working principle of the embodiment of the present invention:

[0051] As Figure 7 shown, for the modular on-line analytical instrument of this embodiment, the entire power of the light source 37 is controlled to a particularly narrow region. The precise wavelength of the laser can be finely tuned on the absorption line by changing the temperature or current of the laser. The laser passes through the gas sample, and the laser power passing through the sample is detected, which is a function of the laser wavelength. When the laser emission wavelength exactly coincides with the resonance absorption in the molecule, we will see an obvious absorption signal.

[0052] The principle of laser analysis: The intensity of gas absorption depends on the number of molecules, the cross-sectional area, and the optical path length. Therefore, the gas concentration can be expressed as:

[0053]

[0054] It can be seen from this expression that we need to distinguish the light absorbed by the molecules from the light absorbed by other factors such as dust and dirt in the measurement path. To determine the gas concentration, we measure the absorption intensity at a certain characteristic wavelength and divide it by the cross-sectional area and the path. The absorption intensity is calculated according to Lambert-Beer's law.

[0055] The modular on-line analyzer for process control disclosed in the embodiments of the present invention aims to solve the problems existing in traditional on-line analyzers, such as long lag time, complex equipment, high cost, and environmental pollution. The analyzer includes a modular sampling probe 1, an optical fiber 2, and a transmitter 3. The modular sampling probe 1 is connected to a process pipeline 4 and is internally provided with a measurement cell 23 for directly measuring the process medium without sampling transmission and complex pretreatment, significantly shortening the lag time and reducing the emission of waste liquid and waste gas. The transmitter 3 includes a detection module 36, an analysis module, etc., and different functional sub-modules, such as infrared, ultraviolet, and laser modules, can be configured according to requirements to achieve on-line detection of various gases. The invention has the advantages of compact structure, low cost, simple maintenance, and environmental friendliness, and is suitable for the efficient, low-carbon, and circular green transformation of industries such as petrochemical industry, meeting the development goals of the national promotion of the green petrochemical industry system.

[0056] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0057] The above-described embodiments are only for describing the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A modular on-line analyzer for process control, characterized in that It includes a modular sampling probe (1), an optical fiber (2), and a transmitter (3); the modular sampling probe (1) is connected to a process pipeline (4), and includes a probe body (11) and a sampling pipe (16) connected below the probe body (11). An upward channel (25) and a downward channel (26) are provided in the sampling pipe (16). One ends of the upward channel (25) and the downward channel (26) are arranged at the end of the sampling pipe (16) to form a sampling port (17), and the other ends penetrate through to the inner cavity of the probe body (11) to form a measurement cell (23). Two ends of the measurement cell (23) are respectively connected to a transmitting unit optical fiber connector (12) and a receiving unit optical fiber connector (13); the transmitter (3) includes a detection module (36) composed of at least one light source (37) and a detector (38). The light source (37) is connected to the transmitting unit optical fiber connector (12) through an optical fiber (2), and the detector (38) is connected to the receiving unit optical fiber connector (13) through another optical fiber (2).

2. The modular on-line analytical instrument for process control according to claim 1, characterized in that Light-transmitting windows are hermetically installed at the positions where two ends of the measurement cell (23) are connected to the transmitting unit optical fiber connector (12) and the receiving unit optical fiber connector (13).

3. The modular on-line analytical instrument for process control according to claim 2, characterized in that, The light-transmitting windows are sapphire windows (21) detachably installed at two ends of the probe body (11).

4. The modular on-line analytical instrument for process control according to claim 1, characterized in that, A calibration gas port (27) is connected to one side of the probe body (11), and the calibration gas port (27) is connected to the measurement cell (23) through an internal pipeline.

5. The modular on-line analyzer for process control according to claim 1, characterized in that The modular sampling probe (1) further includes a root valve (28), and the root valve (28) is installed at a position of the sampling pipe (16) close to the sampling port (17).

6. The modular on-line analyzer for process control according to claim 1, characterized in that, An explosion-proof heater (18) is installed on the probe body (11), and the explosion-proof heater (18) includes a heating element, a temperature sensor, and a heater housing.

7. The modular on-line analyzer for process control according to claim 1, characterized in that, An installation flange (15) is provided at the position where the probe body (11) is connected to the sampling pipe (16). The sampling pipe (16) is connected to the installation flange (15) through a ferrule seal joint (14). One end of the ferrule seal joint (14) is bolted to the installation flange (15), and the other end is connected to the sampling pipe (16) through a sealing ferrule (24). The ferrule seal joint (14) adopts a double-ferrule structure.

8. The modular on-line analyzer for process control according to claim 7, characterized in that, The sealing ferrule (24) is made of an elastic material, and hugs and presses tightly on the outer wall of the sampling pipe (16) through its elastic deformation.

9. The modular on-line analytical instrument for process control according to any one of claims 1 to 8, characterized in that, The transmitter (3) includes an explosion-proof housing (31), a display module (32), a power supply module (33), an input / output module (34), a control module (35), and a detection module (36).

10. The modular on-line analytical instrument for process control according to claim 1, characterized in that, The transmitter (3) further includes an analysis module. The analysis module configures different functional sub-modules according to detection requirements, and the functional sub-modules include at least one of an infrared module, an ultraviolet module, and a laser module.

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