A maintenance-friendly gas absorption cell

Abstract

This utility model relates to the field of flue gas analyzer technology, specifically an easy-to-maintain gas absorption cell, including an absorption cell body. Lens mechanisms and reflector mechanisms are respectively arranged at both ends of the absorption cell body. Maintenance window mechanisms are provided on the outer sides of the absorption cell body corresponding to the lens and reflector mechanisms. The absorption cell body also has at least one gas passage interface for gas flow. This easy-to-maintain gas absorption cell, through the maintenance window mechanisms at both ends of the absorption cell body, effectively protects the lens and reflector from contamination by dust, acidic aerosols, tar, and other substances in the flue gas. Cleaning only requires unscrewing the screws of the window mounting base to separate it from the absorption cell body, and then wiping the ultraviolet plane window. There is no need to disassemble the lens and reflector mechanisms, and the optical path of the gas chamber is not affected, making operation simple.

Description

Technical Field

[0001] This utility model relates to the field of flue gas analyzer technology, specifically to an easy-to-maintain gas absorption cell. Background Technology

[0002] Ultraviolet differential absorption spectroscopy (UV-DOAS) is a primary means of online monitoring of flue gas pollutants such as SO2 and NOx. Its measurement accuracy is highly dependent on the stability of the gas chamber optical system. In actual pollution source monitoring environments, the absorption cell serves as the analysis unit. After the flue gas enters the gas chamber cavity, substances such as dust, acidic aerosols, and tar in the flue gas can easily contaminate the lens, leading to inaccurate measurements. Regular cleaning and disassembly of the gas chamber lens is necessary. Since the gas chamber reflector is usually coated with a metal reflective film, the metal film is easily damaged when not cleaned properly, affecting the measurement. Furthermore, when the gas chamber is disassembled and reinstalled, the micro-angular offset of the optical lens can introduce measurement errors. Utility Model Content

[0003] To achieve the above objectives, this utility model provides the following technical solution: an easy-to-maintain gas absorption pool, comprising an absorption pool body, with a lens mechanism and a reflector mechanism respectively disposed at both ends of the absorption pool body, and maintenance window mechanisms provided on the outer sides of the lens mechanism and the reflector mechanism respectively, and the absorption pool body also having at least one gas path interface for gas flow; the lens mechanism includes a lens mounting part and at least one optical lens, and at least one optical fiber connector for optical path coupling is mounted on the lens mechanism; the reflector mechanism includes a reflector mounting part and at least one reflector for optical path reflection.

[0004] Furthermore, the two ends of the absorption tank body are provided with semi-circular openings corresponding to the installation positions of the maintenance window mechanism. A sealing element is provided in the opening, and the maintenance window mechanism is sealed and fixed in the opening by fasteners.

[0005] Furthermore, the maintenance window mechanism includes a window plate mounting base fixed in the opening by fasteners, and an ultraviolet flat window plate is fixedly mounted on the inner side of the window plate mounting base.

[0006] Furthermore, the window mounting base is a combination structure of an upper arc-shaped block and a lower ring. The upper arc-shaped block is adapted to the contour of the opening, and the lower ring is adapted to the inner wall of the absorption pool body.

[0007] Furthermore, the lens mounting part is a lens end cap, which has a convex cylindrical structure with a groove for accommodating the sealing element on its small diameter section. The optical lens consists of two ultraviolet lenses, which are fixedly mounted on the lens end cap. The fiber optic connector is fixed to the lens end cap by fasteners.

[0008] Furthermore, the reflector mounting part is a reflector end cap, which has a convex cylindrical structure. A groove for accommodating the sealing element is opened on its small diameter section, and a circular concave reflector is installed on the inner side of the reflector end cap.

[0009] Furthermore, the gas interface is located on the side of the absorption tank body and is used to connect to the gas nozzle.

[0010] Furthermore, the bottom of the absorption tank body is provided with two sets of arc-shaped grooves, and support blocks are installed in the arc-shaped grooves. The support blocks can be locked and fixed to the table surface by fasteners.

[0011] Furthermore, the absorption pool body has grooves at both ends for accommodating the sealing components, so as to achieve a sealed fit with the lens mechanism and the reflector mechanism.

[0012] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0013] This easy-to-maintain gas absorption cell, through the maintenance window mechanism set at both ends of the absorption cell body, can effectively protect the lens and reflector from dust, acidic aerosols, tar and other substances in the flue gas that can easily contaminate the lens. During cleaning, simply unscrew the screws of the window mounting base to separate it from the absorption cell body, and then wipe the ultraviolet plane window. There is no need to disassemble the lens mechanism and reflector mechanism, and it does not affect the optical path of the gas chamber. The operation is simple. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is an exploded view of the structure of this utility model;

[0016] Figure 3 This utility model is an exploded view of the lens mechanism, the reflector mechanism, and the maintenance window mechanism;

[0017] Figure 4 This is a structural diagram showing the connection between the absorption tank body and the support block in this utility model;

[0018] Figure 5 This utility model Figure 4 Cross-sectional structural diagram;

[0019] Figure 6 This utility model Figure 4 Exploded view;

[0020] Figure 7 This is the structured optical path diagram of this utility model.

[0021] In the diagram: 1. Absorption cell body; 11. Opening; 12. Arc groove; 2. Lens mechanism; 3. Reflector mechanism; 4. Maintenance window mechanism; 5. Gas path interface; 21. Fiber optic connector; 22. Lens end cap; 23. Ultraviolet lens; 31. Reflector end cap; 32. Circular concave reflector; 41. Ultraviolet planar window; 42. Window mounting base; 6. Support block. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-7 This embodiment of an easy-to-maintain gas absorption pool includes an absorption pool body 1, which is a hollow cavity structure. A lens mechanism 2, a reflector mechanism 3, and a maintenance window mechanism 4 are symmetrically arranged at both ends of the absorption pool body 1. The absorption pool body 1 is also provided with at least one gas passage interface 5. The two ends of the absorption pool body 1 are respectively provided with grooves for accommodating sealing rings to achieve a sealed fit with the lens mechanism 2 and the reflector mechanism 3.

[0024] The lens mechanism 2 includes a lens end cap 22, two ultraviolet lenses 23, and two fiber optic connectors 21. The lens end cap 22 is a convex cylinder with a groove on the outer periphery of its small diameter end for placing a sealing ring to ensure the air chamber is sealed. The two ultraviolet lenses 23 are fixed to the inner side of the lens end cap 22 by ultraviolet curing process and are used to collimate the incident light and focus the emitted light, respectively. The two fiber optic connectors 21 are symmetrically fixed to the outer side of the lens end cap 22 by fastening screws and are used to connect external optical fibers to the spectrometer.

[0025] The reflector mechanism 3 includes a reflector end cap 31 and a circular concave reflector 32. The reflector end cap 31 is also a convex cylinder with a sealing ring groove on the outer periphery of its small diameter end, which is consistent with the structure of the lens end cap to ensure the sealing of both ends. The circular concave reflector 32 is fixed to the inner side of the reflector end cap 31 by ultraviolet curing process, and is used to reflect the parallel light incident from the lens mechanism 2 multiple times to extend the optical path.

[0026] The maintenance window mechanism 4 includes an ultraviolet flat window 41 and a window mounting base 42. The ultraviolet flat window 41 is fixed to the inner side of the window mounting base 42 by ultraviolet curing process to isolate the flue gas from the core optical components and prevent pollution. The two ends of the absorption pool body 1 are provided with openings 11 corresponding to the installation position of the maintenance window mechanism 4, and the inner side is provided with a groove for placing a sealing strip to enhance the airtightness. The window mounting base 42 is detachably fixed in the opening by fastening screws. The structure of the window mounting base is divided into an upper arc-shaped block that fits the opening and a lower ring that fits the inner side of the absorption pool body 1 to ensure the fit with the body after installation.

[0027] In addition, two sets of arc-shaped grooves 12 are provided at the bottom of the absorption tank body 1. Support blocks 6 are installed in the arc-shaped grooves 12. The support blocks 6 can be locked and fixed to the table surface by screws to achieve stable installation of the absorption tank.

[0028] To further explain, the gas interface 5 is located on the side of the absorption tank body 1 and is used to connect the gas nozzle to realize the entry and exit of the flue gas to be tested.

[0029] The working principle of the above embodiments is as follows:

[0030] The ultraviolet light emitted by the external spectrometer is transmitted via optical fiber to one of the fiber optic connectors of the lens mechanism. After being collimated into parallel light by the corresponding ultraviolet lens, the parallel light passes through the ultraviolet plane window of the maintenance window mechanism and enters the interior of the absorption cell. It is reflected multiple times by the circular concave mirror. Finally, the reflected light passes through the ultraviolet plane window again, is focused by another ultraviolet lens of the lens mechanism, and is transmitted back to the spectrometer through another fiber optic connector. The flue gas to be detected is introduced into the interior of the absorption cell through the gas path interface. Pollutants such as SO2 and NOx in the flue gas absorb ultraviolet light of specific wavelengths. The spectrometer calculates the pollutant concentration by analyzing the changes in light intensity before and after absorption. When the monitoring data drifts, the gas path system is shut down, the screws of the maintenance window mechanism are unscrewed, the window mounting base is removed, and the surface of the ultraviolet plane window is gently wiped with a lint-free cloth soaked in anhydrous ethanol. After the ethanol evaporates, the window is reinstalled in the mounting base and the screws are tightened to restore the gas path. The maintenance is completed without touching the lens and mirror.

[0031] The entire workflow is now complete, and anything not described in detail in this specification is existing technology known to those skilled in the art.

[0032] It should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gas absorption cell that is easy to maintain, characterized in that: The absorption pool body (1) includes a lens mechanism (2) and a reflector mechanism (3) respectively at both ends of the absorption pool body (1). A maintenance window mechanism (4) is provided on the outer side of the lens mechanism (2) and the reflector mechanism (3) respectively. The absorption pool body (1) is also provided with at least one gas passage interface (5) for gas flow. The lens mechanism (2) includes a lens mounting part and at least one optical lens, and at least one optical fiber connector (21) for optical path coupling is mounted on the lens mechanism (2); The reflector mechanism (3) includes a reflector mounting part and at least one reflector for optical path refracting.

2. The easy-to-maintain gas absorption tank according to claim 1, characterized in that: The absorption pool body (1) has semi-circular openings (11) at both ends corresponding to the installation positions of the maintenance window mechanism (4). The openings (11) are equipped with sealing elements, and the maintenance window mechanism (4) is sealed and fixed in the openings (11) by fasteners.

3. The easy-to-maintain gas absorption tank according to claim 2, characterized in that: The maintenance window mechanism (4) includes a window plate mounting base (42) fixed in the opening (11) by fasteners, and an ultraviolet flat window plate (41) is fixedly mounted on the inner side of the window plate mounting base (42).

4. The easy-to-maintain gas absorption tank according to claim 3, characterized in that: The window mounting base (42) is a combination structure of an upper arc block and a lower ring. The upper arc block is adapted to the outline of the opening (11), and the lower ring is adapted to the inner wall of the absorption pool body (1).

5. The easy-to-maintain gas absorption tank according to claim 1, characterized in that: The lens mounting part is a lens end cap (22), which has a convex cylindrical structure and a groove for accommodating the sealing element is provided on its small diameter section. The optical lens is two ultraviolet lenses (23), which are fixedly mounted on the lens end cap (22). The fiber optic connector (21) is fixed to the lens end cap (22) by fasteners.

6. The easy-to-maintain gas absorption tank according to claim 1, characterized in that: The mirror mounting part is a mirror end cap (31). The mirror end cap (31) has a convex cylindrical structure. A groove for accommodating the sealing element is opened on its small diameter section. A circular concave mirror (32) is installed on the inner side of the mirror end cap (31).

7. The easy-to-maintain gas absorption tank according to claim 1, characterized in that: The gas interface (5) is located on the side of the absorption tank body (1) and is used to connect the gas nozzle.

8. The easy-to-maintain gas absorption tank according to claim 1, characterized in that: The bottom of the absorption pool body (1) is provided with two sets of arc-shaped grooves (12), and a support block (6) is installed in the arc-shaped groove (12). The support block (6) can be locked and fixed to the table surface by fasteners.

9. The easy-to-maintain gas absorption tank according to claim 1, characterized in that: The absorption pool body (1) has grooves at both ends for accommodating the sealing components, so as to achieve a sealed fit with the lens mechanism (2) and the reflector mechanism (3).

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