A gas measurement cell integrated with a humidity monitoring unit

Abstract

The present invention provides a gas measurement gas chamber integrated with a humidity monitoring unit, which includes a front seat of the gas chamber, a heating tube, a lens seat, a corner cube prism, a wedge prism, a lens seat body of the gas chamber, a collimating lens, an optical fiber sliding seat, and a humidity detection unit. The corner cube prism and the wedge prism are fixedly arranged on the lens seat, and the corner cube prism is arranged close to the side of the front seat of the gas chamber. The corner cube prism and the wedge prism are located on the central axis. The collimating lens, the optical fiber sliding seat, and the humidity detection unit are arranged on the lens seat body of the gas chamber. The central axis of the collimating lens is parallel to and spaced from the central axis of the corner cube prism. When slight deformation occurs in the gas chamber structure, causing a certain change in the angles of the wedge lens and the corner cube prism, the light energy received by the receiving optical fiber remains basically unchanged, improving the assembly stability. The collimating lens has a double curvature, thereby reducing the influence of chromatic dispersion on light regulation and making the regulation of the light intensity in the gas chamber more convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas detection equipment, and particularly relates to a gas measurement chamber integrated with a humidity monitoring unit. Background Art

[0002] At present, the methods for measuring the concentrations of pollutants such as SO2, NO, and NO2 in flue gas during flue gas emission monitoring are diverse. Among them, the thermal wet method does not require dehumidification, can avoid the dissolution loss of water-soluble components such as SO2 and NH3 during the condensation process, and can place the gas chamber inside the sampling tube, designed as a structure integrating the sampling tube and the main unit, which is convenient to carry. Therefore, it is more suitable for portable flue gas analysis. However, when measuring flue gas components by the thermal wet method, the ultraviolet differential method measures the humidity concentration of the flue gas. It is necessary to measure the moisture content of the flue gas and then convert it into the dry gas concentration. Therefore, a flue gas humidity monitoring unit must be configured.

[0003] The patent with the application number 201910813875.6 discloses a method for improving the stability of the optical path system of the thermal wet method, its gas chamber, and measuring instrument. However, in the technical solution disclosed in this patent, there are the following deficiencies:

[0004] (1) There is no reserved installation position for the flue gas humidity unit, and it is impossible to directly measure the moisture content of the flue gas in the gas chamber. Moreover, the installation position and installation method of the humidity monitoring unit will affect the test results of the flue gas moisture content, and further affect the accuracy of the flue gas concentration.

[0005] (2) Using a plano-convex lens with a single curvature for optical fiber transmission at the light-emitting end of the gas chamber will cause different light intensities of different wavelengths received due to dispersion, making it difficult to achieve the required light intensity in the required wavelength band. Summary of the Invention

[0006] Aiming at the defects in the prior art, the present invention provides a gas measurement chamber integrated with a humidity monitoring unit, which improves the accuracy of the flue gas moisture content test, and further ensures the accuracy of the flue gas measurement concentration. A plano-convex lens with a double curvature is set in the optical path to reduce the influence of dispersion on the difficulty of light intensity adjustment and improve the ease of operation of light intensity adjustment in the gas chamber.

[0007] The present invention provides a gas measurement chamber integrated with a humidity monitoring unit, which includes a gas chamber front seat, a lens seat, a corner cube prism, a wedge prism, a gas chamber lens seat body, a collimating lens, an optical fiber sliding seat, and a humidity detection unit, wherein:

[0008] One end of the gas chamber front seat is connected to the lens seat;

[0009] The corner cube prism and the wedge prism are fixedly arranged on the lens seat, and the corner cube prism is arranged on the side close to the gas chamber front seat. The central axes of the corner cube prism and the wedge prism are on the same straight line;

[0010] The collimating lens, the optical fiber sliding seat and the humidity detection unit are arranged on the air chamber lens seat body. The collimating lens and the optical fiber sliding seat are parallel and non-coincident in axis, and the collimating lens is arranged on one side close to the front seat of the air chamber. The central axis of the collimating lens is parallel and spaced from the central axis of the corner cube prism.

[0011] Within a preset radius range centered on the central axis of the collimating lens, the curvature radius of the collimating lens is the first curvature radius. Outside the preset radius range centered on the central axis of the collimating lens and up to the outer edge of the collimating lens, the curvature radius of the collimating lens is the second curvature radius, and the first curvature radius is greater than the second curvature radius.

[0012] Furthermore, the size range of the first curvature radius is 11 mm - 13 mm, and the size range of the second curvature radius is 8 mm - 10.5 mm.

[0013] Furthermore, the preset radius size is 3.5 mm.

[0014] Furthermore, the corner cube prism is connected to the lens seat through a corner cube fixing pad.

[0015] Furthermore, the collimating lens is a plano-convex lens or a biconvex lens.

[0016] Furthermore, a flue gas outlet is arranged on the air chamber lens seat body, and the flue gas is discharged outwards through the flue gas outlet.

[0017] Furthermore, a retaining ring is arranged at the end of the lens seat, and the retaining ring is sleeved on the outer wall of the wedge-shaped lens.

[0018] Furthermore, an air chamber cylinder is further included, and a heating film or a heating tape is wrapped outside the air chamber cylinder.

[0019] Furthermore, a vacuum heat insulation tube or a protection tube with heat insulation material is also provided.

[0020] The beneficial effects of the present invention are reflected in that the present invention provides a gas measurement chamber integrated with a humidity monitoring unit, which includes a front seat of the chamber, a chamber cylinder, a lens seat, a corner cube prism, a wedge prism, a chamber lens seat body, a collimating lens, an optical fiber sliding seat and a humidity detection unit. The corner cube prism and the wedge prism are fixedly arranged on the lens seat, and the corner cube prism is arranged close to the side of the front seat of the chamber. The corner cube prism and the wedge prism are located on the same central axis. The collimating lens, the optical fiber sliding seat and the humidity detection unit are arranged on the chamber lens seat body. The central axis of the collimating lens is parallel to and spaced from the central axis of the corner cube prism. When the structure of the chamber is slightly deformed, causing a certain change in the angles of the wedge lens and the corner cube prism, the light energy received by the receiving optical fiber remains basically unchanged, improving the assembly stability. The collimating lens has a double curvature, thereby reducing the influence of chromatic dispersion on light regulation and making the regulation of the light intensity in the chamber more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0022] Figure 1 It is a structural diagram of a gas measurement chamber integrated with a humidity monitoring unit provided by an embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the optical path in the chamber unit in an embodiment of the present invention;

[0024] Figure 3 It is a structural diagram of the collimating lens in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will describe in detail the embodiments of the technical solutions of the present invention with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0026] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art to which the present invention belongs.

[0027] Please refer to Figure 1 As shown, the gas measurement chamber integrated with a humidity monitoring unit includes a vacuum insulation outer tube 11, a vacuum insulation inner tube 12, a chamber unit, a front seat 13 of the chamber, a vacuum insulation tube flange 14 and a sampling tube connection flange 15.

[0028] A vacuum insulation tube or a protective tube with heat insulation material is provided outside the gas chamber unit. For example, it may include a vacuum insulation inner tube 12 and a vacuum insulation outer tube 11, wherein the vacuum insulation inner tube 12 is arranged inside the vacuum insulation outer tube 11.

[0029] One end of the vacuum insulation inner tube 12 and the vacuum insulation outer tube 11 is connected to a vacuum insulation tube flange 14, and the other end of the vacuum insulation inner tube 12 and the vacuum insulation outer tube 11 is connected to a sampling tube connection flange 15. The gas chamber front seat 13 is connected to the vacuum insulation tube flange 14 and presses the end of the filter assembly.

[0030] The gas chamber unit is connected inside the vacuum insulation inner tube 12. The gas chamber unit includes a gas chamber front seat 21, a heating tube 22, a lens seat 23, a corner cube prism 24, a wedge prism 25, a gas chamber lens seat body 26, a collimating lens 27, an optical fiber sliding seat 28, and a humidity detection unit 29.

[0031] A hot and humid method PTFE filter element 31 is arranged inside the gas chamber front seat 21, and a stainless steel sintered filter chip 32 is arranged at the end of the gas chamber front seat 21. The hot and humid method PTFE filter element 31 and the stainless steel sintered filter chip 32 are used to filter the flue gas conveyed through the gas chamber front seat 13.

[0032] The end of the gas chamber front seat 13 is connected to the end of the gas chamber front seat 21. The other end of the gas chamber front seat 21 is connected to the lens seat 23 and the heating tube 22, and the lens seat 23 is accommodated inside the heating tube 22. The outside of the gas chamber cylinder is wrapped with a heating film or a heating tape.

[0033] The corner cube prism 24 and the wedge prism 25 are fixedly arranged on the lens seat 23, and the corner cube prism 24 is arranged on the side close to the gas chamber front seat 13. The corner cube prism 24 and the wedge prism 25 are on the same central axis, and the corner cube prism 24 is connected to the lens seat 23 through a corner cube fixing pad 241.

[0034] Please refer to Figure 2As shown in the figure, a collimating lens 27, an optical fiber sliding seat 28 and a humidity detection unit 29 are arranged on the air chamber lens seat body 26. The collimating lens 27 and the optical fiber sliding seat 28 are located on the same axis, and the collimating lens 27 is arranged closer to the front seat 13 of the air chamber. The central axis of the collimating lens 27 is parallel to and spaced from the central axis of the corner cube prism 24, and the convex surface of the collimating lens 27 faces the front seat 13 of the air chamber. The transmitting optical fiber deviates from the main central axis, and the parallel light after passing through the collimating lens 27 forms an angle with the main central axis. The wedge prism 25 is a double-wedge light-transmitting glass with a thick middle and thin sides that is centrosymmetric. After the parallel light is incident, the outgoing light will deflect towards the center, and the deflection angle is related to the angle between the two sides of the wedge prism 25 and the refractive index. The wedge angle of the wedge prism 25 makes the parallel light become a light ray parallel to the main central axis after incidence and incident on the corner cube prism 24. According to the characteristics of the corner cube prism 24, after being reflected by each total reflection surface of the corner cube prism 24, the outgoing light ray undergoes lateral displacement and exits at 180° to the incident light ray. After passing through another part of the wedge prism 25, the outgoing light ray deflects towards the main central axis and converges exactly to the end of the receiving optical fiber after passing through the collimating lens 27. Since the deflection angle of the wedge prism 25 is basically unchanged when the incident angle changes slightly, and the corner cube prism always reverses the incident light ray by 180°, the system is insensitive to the installation angles of the wedge prism 25 and the corner cube prism. When the air chamber structure is slightly deformed, causing certain changes in the angles of the wedge prism 25 and the corner cube prism, the light energy received by the receiving optical fiber remains basically unchanged, so it has high stability.

[0035] A flue gas outlet is arranged on the air chamber lens seat body 26, and the flue gas is discharged outward through the flue gas outlet. A retaining ring 231 is arranged at the end of the lens seat 23, and the retaining ring 231 is sleeved on the outer wall of the wedge prism 25.

[0036] Please refer to Figure 3 As shown in the figure, within a preset radius range centered on the central axis of the collimating lens 27, the curvature radius of the collimating lens 27 is the first curvature radius. Outside the preset radius range centered on the central axis of the collimating lens 27 and up to the outer edge of the collimating lens 27, the curvature radius of the collimating lens 27 is the second curvature radius, and the first curvature radius is greater than the second curvature radius. Among them, the size range of the first curvature radius is 11 mm - 13 mm, the size range of the second curvature radius is 8 mm - 10.5 mm, and the preset radius size is 3.5 mm. The collimating lens 27 is a plano-convex lens with double curvature, which reduces the influence of chromatic dispersion on light adjustment and makes the adjustment of the light intensity in the air chamber more convenient.

[0037] In summary, the beneficial effects of the present invention are as follows: The present invention provides a gas measurement gas chamber integrated with a humidity monitoring unit, which includes a gas chamber front seat, a heating tube, a lens seat, a corner cube prism, a wedge prism, a gas chamber lens seat body, a collimating lens, an optical fiber sliding seat, and a humidity detection unit. The corner cube prism and the wedge prism are fixedly arranged on the lens seat, and the corner cube prism is arranged close to the side of the gas chamber front seat. The corner cube prism and the wedge prism are located on the same central axis. The collimating lens, the optical fiber sliding seat, and the humidity detection unit are arranged on the gas chamber lens seat body. The central axis of the collimating lens is parallel to and spaced from the central axis of the corner cube prism. When the structure of the gas chamber is slightly deformed, causing a certain change in the angles of the wedge lens and the corner cube prism, the light energy received by the receiving optical fiber remains basically unchanged, improving the assembly stability. The collimating lens has a double curvature, thereby reducing the influence of chromatic dispersion on light regulation and making the regulation of the light intensity in the gas chamber more convenient.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. A gas measurement chamber integrated with a humidity monitoring unit, characterized in that, It includes a front air chamber seat, a lens seat, a corner cube prism, a wedge prism, an air chamber lens seat body, a collimating lens, an optical fiber sliding seat, and a humidity detection unit, wherein: One end of the front air chamber seat is connected to the lens seat; The corner cube prism and the wedge prism are fixedly arranged on the lens seat, and the corner cube prism is arranged on the side close to the front air chamber seat. The central axes of the corner cube prism and the wedge prism are on the same straight line; The collimating lens, the optical fiber sliding seat, and the humidity detection unit are arranged on the air chamber lens seat body. The axes of the collimating lens and the optical fiber sliding seat are parallel and non-coincident, and the collimating lens is arranged on the side close to the front air chamber seat. The central axis of the collimating lens is parallel and spaced from the central axis of the corner cube prism; Within a preset radius range centered on the central axis of the collimating lens, the curvature radius of the collimating lens is a first curvature radius. Outside the preset radius range centered on the central axis of the collimating lens and up to the outer edge portion of the collimating lens, the curvature radius of the collimating lens is a second curvature radius, and the first curvature radius is greater than the second curvature radius; The dimension range of the first curvature radius is 11 mm - 13 mm, and the dimension range of the second curvature radius is 8 mm - 10.5 mm; the preset radius dimension is 3.5 mm.

2. The gas measurement chamber of the integrated humidity monitoring unit according to claim 1, characterized in that, The corner cube prism is connected to the lens seat through a corner cube fixing pad.

3. The gas measurement chamber of the integrated humidity monitoring unit according to claim 1, characterized in that, The collimating lens is a plano-convex lens or a biconvex lens.

4. The gas measurement chamber of the integrated humidity monitoring unit according to claim 1, characterized in that, A flue gas outlet is arranged on the air chamber lens seat body, and the flue gas is discharged outward through the flue gas outlet.

5. The gas measurement chamber integrating a humidity monitoring unit according to claim 1, characterized in that, A retaining ring is arranged at the end of the lens seat, and the retaining ring is sleeved on the outer wall of the wedge prism.

6. The gas measurement chamber of the integrated humidity monitoring unit according to claim 1, characterized in that, It further includes an air chamber cylinder, and a heating film or a heating tape is wrapped outside the air chamber cylinder.

7. The gas measurement chamber of the integrated humidity monitoring unit according to claim 1, characterized in that, A vacuum heat insulation tube or a protection tube with heat insulation material is also provided.

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