Online automatic calibration system of laser oxygen analyzer

Abstract

The utility model belongs to the technical field of analytical instruments, and relates to an on-line automatic calibration system of a laser oxygen analyzer, which is characterized by comprising a laser light source and a light splitting device which is respectively connected with a measuring pipeline and a standard gas calibration device. The measuring pipeline and the standard gas calibration device are respectively connected with corresponding photoelectric conversion devices, and the photoelectric conversion devices and the standard gas calibration device are respectively connected with the man-machine interaction device through the signal processing and control device. According to the utility model, a plurality of standard gas chambers sealed with different standard gases are arranged inside, regular on-line automatic calibration and calibration of the laser oxygen analyzer can be realized through program control selection, the calibration efficiency of the laser oxygen analyzer is improved, and the operation and maintenance cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of analytical instruments, and in particular relates to an online automatic calibration system for a laser oxygen analyzer. Background Art

[0002] In the chemical industry, the detection of oxygen content in various combustion furnaces is crucial. Compared with traditional oxygen measurement methods, such as zirconium oxide and electrochemistry, the tunable laser spectroscopy technology has the advantages of strong adaptability, fast response speed and high accuracy in measuring oxygen content. In particular, the analyzer can be directly installed in situ on the combustion furnace body for measurement, and is widely used in various chemical combustion furnaces.

[0003] However, the laser oxygen analyzer needs to be calibrated and calibrated regularly during use. The current calibration technology is relatively complicated. During calibration, the laser oxygen analyzer needs to be removed from the measuring pipe and then installed on a specific standard pipe for calibration. It is also necessary to prepare a variety of customized standard gases that match the instrument. After the calibration is completed, the analyzer is installed back on the pipe. This process is too cumbersome and greatly increases the operation and maintenance costs of the laser oxygen analyzer. Summary of the invention

[0004] The utility model aims to solve the above problems and provide a system for online automatic calibration of laser oxygen analyzer.

[0005] The main technical solution of the utility model is: an online automatic calibration system for a laser oxygen analyzer, characterized in that it includes a laser light source and a spectrometer, the spectrometer is respectively connected to a measuring pipeline and a standard gas calibration device, the measuring pipeline and the standard gas calibration device are respectively connected to corresponding photoelectric conversion devices, and the photoelectric conversion device and the standard gas calibration device are respectively connected through a signal processing and control device and a human-computer interaction device.

[0006] Generally, the standard gas calibration device is an integrally enclosed device, which includes an upper cover, a standard gas chamber, a rotating base and a lower cover from top to bottom. The standard gas chamber is placed on the rotating base and can rotate intermittently with the rotating base. The upper cover and the lower cover respectively have built-in calibration device windows and are located in the same vertical optical path as the standard gas chamber.

[0007] The standard gas calibration device is sealed and connected to the spectroscopic device and the photoelectric conversion device through the upper cover plate and the lower cover plate respectively, so that the spectroscopic laser beam does not contact the outside world except the standard gas calibration device in the optical path.

[0008] The standard gas calibration device is connected to the signal processing and control device via a control line and a power supply interface.

[0009] The interior space of the standard gas calibration device is equally divided into a number of independent and closed standard gas chambers by a faceplate, the faceplate is fixed on a positioning rotary rod, and the two ends of the positioning rotary rod are respectively connected to an upper cover plate and a rotating base.

[0010] Preferably, the standard gas calibration device includes 4 independent and sealed standard gas chambers, which are fixed on the rotating base through the disc and are filled with four standard gases, namely zero point gas, 10% span gas, 90% span gas and 100% span gas.

[0011] A running track limiting groove is arranged at the bottom of the rotating base, which is connected with the transmission device and the power device through a sliding rod to form an intermittent rotating mechanism.

[0012] Preferably, the intermittent rotating mechanism is a 90-degree intermittent rotating mechanism, and the rotating base rotates 90 degrees when the gear inside the transmission device rotates one circle.

[0013] The standard gas calibration device is provided with a gas inlet and outlet with a valve. Before the instrument is put into use, the internal space of the standard gas calibration device must be filled with a background gas that does not absorb laser (such as N2, etc.).

[0014] The spectroscopic device has a built-in condenser and a spectrometer, and the spectrometer is used to split the laser into two beams, one beam enters the measuring pipe, and the other beam enters the standard gas calibration device, which are respectively used for online measurement and online calibration of process gas.

[0015] Of course, the number of built-in standard air chambers in the present invention is not limited to 4, and multiple ones can be set as needed, and the step angle size of the intermittent rotating mechanism can be adjusted synchronously according to the number of standard air chambers.

[0016] In the automatic calibration system of the utility model, the user can set the built-in automatic calibration interval of the instrument through the human-computer interaction device, or switch to the manual calibration mode. When the instrument is calibrated, the program controls the power device of the standard gas calibration device to rotate the rotating base to the specified angle position through the transmission device, so that the required standard gas chamber is switched to the optical path under the calibration device window. The gas absorption spectrum is obtained through the photoelectric conversion device and the signal processing and control device, and the measured value is compared with the standard gas concentration value in the standard gas chamber. After correcting the internal parameters, a control signal is sent to rotate the rotating base back to the starting position again, waiting for the next calibration instruction, thereby realizing the automatic online calibration of the laser oxygen analyzer.

[0017] The utility model proposes a system for online automatic calibration of laser oxygen analyzers. The system has several standard gas chambers sealed with different standard gases, and can realize regular online automatic calibration and calibration of laser oxygen analyzers through program control selection, thereby improving the calibration efficiency of laser oxygen analyzers and reducing operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the connection structure of the online automatic calibration system of the laser oxygen analyzer in the embodiment.

[0019] In the figure, 1-laser light source; 2-spectrometer; 3-photoelectric conversion device 1; 4-standard gas calibration device; 5-photoelectric conversion device 2; 6-signal processing and control device; 7-human-computer interaction device; 8-measuring pipeline.

[0020] Figure 2 Schematic diagram of the structure of the standard gas calibration device in the embodiment.

[0021] In the figure, 9 is the calibration device window; 10 is the upper cover; 11 is the faceplate; 12 is the standard air chamber; 13 is the rotating base; 14 is the air inlet and outlet with valves; 15 is the lower cover; 16 is the positioning rotary rod; 17 is the transmission device; 18 is the power device; 19 is the control line and the power supply interface. DETAILED DESCRIPTION

[0022] The utility model is described in detail below in conjunction with the accompanying drawings and embodiments. Example

[0023] This embodiment includes a system for online automatic calibration of a laser oxygen analyzer. The connection structure diagram is shown in the attached Figure 1 As shown; Figure 2 This is a schematic diagram of the structure of the standard gas calibration device in the automatic calibration system.

[0024] The laser oxygen analyzer online automatic calibration system of the embodiment mainly comprises a laser light source (1) and a spectrometer (2), the spectrometer (2) being connected to a measuring pipe (8) and a standard gas calibration device (4) respectively, the measuring pipe (8) and the standard gas calibration device (4) being connected to corresponding photoelectric conversion devices respectively, and the photoelectric conversion device and the standard gas calibration device (4) being connected via a signal processing and control device (6) and a human-computer interaction device (7) respectively.

[0025] Figure 1In the schematic diagram of the connection structure of the online automatic calibration system of the laser oxygen analyzer shown, the laser light source (1) emits a characteristic spectrum laser that is only absorbed by oxygen. After passing through the condenser and the spectrometer built in the spectrometer (2), the light beam is split into two. One beam enters the measuring pipe (8), is absorbed by the oxygen in the process sample gas, and the transmitted light beam is collected by the photoelectric conversion device 1 (3) and converted into an electrical signal, which is sent to the signal processing and control device (6). After data processing, it is converted into a digital signal and sent to the human-computer interaction device (7) for display; the other beam enters the standard gas calibration device (4), is absorbed by the oxygen in the standard gas chamber (12), and the transmitted light beam is collected by the photoelectric conversion device 2 (5) and converted into an electrical signal, which is sent to the signal processing and control device (6). When the calibration program is running, data processing is performed and internal parameters are corrected, otherwise no processing is performed. The user can set the built-in automatic calibration interval of the instrument through the human-computer interaction device (7), or switch to manual calibration mode.

[0026] Figure 2In the structural schematic diagram of the standard gas calibration device (4), the appearance of the standard gas calibration device (4) is a closed whole, the upper cover plate (10) is sealed with the spectrometer (2), and the lower cover plate (15) is sealed with the photoelectric conversion device 2 (5), so that the laser beam of the spectrometer does not contact the outside world except the standard gas calibration device (4) in the optical path; the calibration device window (9) is built into the upper cover plate (10) and the lower cover plate (15), and is located at the exit of the spectrometer (2) together with the standard gas chamber (12). In the vertical beam optical path; the faceplate (11) divides the internal space of the standard gas calibration device (4) into four equal parts, the faceplate (11) is fixed on the positioning rotary rod (16), and the two ends of the positioning rotary rod (16) are respectively connected to the upper cover plate (10) and the rotating base (13); the standard gas chamber (12) is four independent closed gas chambers, which are filled with standard gas (zero point gas, 10% span gas, 90% span gas, span gas), and the four standard gas chambers (12) pass through the faceplate (11) and are fixed to the rotating base. (13), and can intermittently rotate with the rotating base (13); the bottom of the rotating base (13) is designed with a running track limit groove, which is connected to the transmission device (17) and the power device (18) through a slide rod to form a 90-degree intermittent rotation mechanism. When the internal gear of the transmission device (17) rotates one circle, the rotating base (13) rotates 90 degrees; the control line and the power interface (19) are connected to the signal processing and control device (6), and the power device (18) is controlled by the automatic calibration program set in the signal processing and control device (6) to drive the transmission device (17) and the rotating base (13) to rotate, so as to realize the switching selection of the four standard gas chambers (12); the inlet and outlet ports (14) with valves are arranged at the upper and lower ends of the standard gas calibration device (4). Before the instrument is put into use, the internal space of the standard gas calibration device (4) must be filled with a background gas (such as N2, etc.) that does not absorb laser light to prevent the laser beam from being absorbed by the gas outside the standard gas chamber (12) in the standard gas calibration device (4), thereby affecting the calibration accuracy.

[0027] The on-line automatic calibration system of the laser oxygen analyzer of the embodiment has the following specific working process: when the instrument is working normally, the laser light source (1) emits a characteristic spectrum laser that is only absorbed by oxygen, enters the measuring pipe (8) through the spectrometer (2), is absorbed by the oxygen in the process sample gas, and the transmitted light beam is collected by the photoelectric conversion device 1 (3) and converted into an electrical signal, which is sent to the signal processing and control device (6), and after data processing, is converted into a digital signal and sent to the human-computer interaction device (7) for display; when the instrument is automatically calibrated, the program controls the power device (18) in the standard gas calibration device (4) to rotate the rotating base (13) to a specified angle position through the transmission device (17), so that the required standard gas chamber (12) is switched to the optical path under the calibration device window (9). The gas absorption spectrum is obtained through the photoelectric conversion device 2 (5) and the signal processing and control device (6), and the measured value is compared with the standard gas concentration value in the standard gas chamber (12). After correcting the internal parameters, a control signal is sent to make the rotating base (13) rotate back to the starting position again and wait for the next calibration instruction, thereby realizing automatic online calibration of the laser oxygen analyzer.

[0028] Anything not described in this embodiment is well known in the art.

Claims

1. An online automatic calibration system for a laser oxygen analyzer, characterized in that It includes a laser light source and a spectrometer, wherein the spectrometer is respectively connected to a measuring pipeline and a standard gas calibration device, wherein the measuring pipeline and the standard gas calibration device are respectively connected to corresponding photoelectric conversion devices, and the photoelectric conversion device and the standard gas calibration device are respectively connected through a signal processing and control device and a human-computer interaction device.

2. The online automatic calibration system of the laser oxygen analyzer according to claim 1, characterized in that The standard gas calibration device is an integrally sealed device, which includes an upper cover, a standard gas chamber, a rotating base and a lower cover from top to bottom. The standard gas chamber is placed on the rotating base and can rotate intermittently with the rotating base. The upper cover and the lower cover respectively have built-in calibration device windows and are located in the same vertical optical path as the standard gas chamber.

3. The online automatic calibration system of the laser oxygen analyzer according to claim 1 or 2, characterized in that The standard gas calibration device is sealed and connected to the spectroscopic device and the photoelectric conversion device through an upper cover plate and a lower cover plate respectively.

4. The online automatic calibration system for a laser oxygen analyzer according to claim 1, characterized in that The standard gas calibration device is connected to the signal processing and control device via a control line and a power supply interface.

5. The online automatic calibration system for a laser oxygen analyzer according to claim 1 or 2, characterized in that The interior space of the standard gas calibration device is equally divided into a number of independent and closed standard gas chambers by a faceplate, the faceplate is fixed on a positioning rotary rod, and the two ends of the positioning rotary rod are respectively connected to an upper cover plate and a rotating base.

6. The online automatic calibration system of the laser oxygen analyzer according to claim 5, characterized in that The standard gas calibration device includes 4 independent and sealed standard gas chambers, which are fixed on a rotating base through a flower disc and are respectively filled with four standard gases, namely zero point gas, 10% span gas, 90% span gas and 100% span gas.

7. The online automatic calibration system for a laser oxygen analyzer according to claim 2, characterized in that A running track limiting groove is arranged at the bottom of the rotating base, which is connected with the transmission device and the power device through a sliding rod to form an intermittent rotating mechanism.

8. The online automatic calibration system for a laser oxygen analyzer according to claim 7, characterized in that The intermittent rotating mechanism is a 90-degree intermittent rotating mechanism. When the gear inside the transmission device rotates one circle, the rotating base rotates 90 degrees.

9. The online automatic calibration system for a laser oxygen analyzer according to claim 1 or 2, characterized in that The standard gas calibration device is provided with a gas inlet and outlet with a valve.

10. The online automatic calibration system for a laser oxygen analyzer according to claim 1, characterized in that The spectroscopic device has a built-in condenser and a spectrometer, and the spectrometer is used to split the laser into two beams, one of which enters the measuring pipe and the other enters the standard gas calibration device.

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