Integrated optical fiber-free hot-wet method optical measurement air chamber and measurement instrument thereof

Abstract

The utility model provides an integrated optical fiber-free hot wet method optical measurement gas chamber and a measuring instrument thereof, the integrated optical fiber-free hot wet method optical measurement gas chamber comprises a spectrograph, an ultraviolet light source, a gas chamber body and a core connector, the gas chamber body comprises a cylinder body, a main reflecting mirror seat, a main reflecting mirror, a secondary reflecting mirror seat and a secondary reflecting mirror; the right side of the core connecting body is provided with an adapter piece, the adapter piece is connected with the main reflector base through a heat insulation stud, the upper end of the core connecting body is provided with an ultraviolet light source, and the left side of the core connecting body is connected with a spectrograph through a heat insulation plate and a fixing plate. The high-temperature environment of the air chamber body is separated from the ultraviolet light source and the spectrograph, so that the ultraviolet light source and the spectrograph can be effectively prevented from being influenced by high temperature, and the detection precision is ensured. Optical fiber connection is canceled, and system complexity and light loss are reduced, so that the overall stability of the instrument is enhanced, maintenance requirements caused by optical fiber loss are reduced, and the overall use cost is reduced. The measuring instrument is compact in structure and convenient for field measurement.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of gas detection equipment, especially relates to an integrated optical measurement gas chamber without optical fiber of hot and humid method and measuring instrument thereof. BACKGROUND

[0002] Flue gas monitoring refers to monitoring the concentration and total emission of gaseous pollutants and particulate matters discharged by atmospheric pollution sources, and the concentration of pollutants such as SO2, NO and NO2 in flue gas needs to be measured during the monitoring process, and the measurement method usually adopts ultraviolet absorption method. The ultraviolet absorption method is mainly divided into hot and humid method and cold and dry method, wherein the hot and humid method does not need to carry out gas dehumidification, and avoids the dissolution loss of components such as SO2 and NH3 which are easily dissolved in water during the condensation process of the cold and dry method. The detection instrument adopting the hot and humid method can integrate the optical gas chamber into the inside of the sampling pipe, and is designed as an integrated structure of the sampling pipe and the host computer, so as to facilitate on-site operation and form a portable flue gas analyzer.

[0003] In the hot and humid detection instrument, the temperature in the optical gas chamber is usually required to reach above 120 DEG C, but since the light source and the detection assembly are difficult to withstand high temperature, therefore, the traditional design adopts optical fiber to connect the light source and the detector with the optical gas chamber, so as to achieve the purpose of heat insulation, however, this scheme has the following disadvantages: the optical fiber connection increases the complexity of the system, the vibration of the optical fiber affects the stability of the instrument; the light transmission efficiency of the optical fiber is limited, which affects the detection sensitivity and raises the detection limit of the instrument; the connection structure of the optical fiber is complex, the cost is high, and the optical fiber is easy to be damaged in high temperature and high humidity environment, which increases the maintenance rate. UTILITY MODEL CONTENTS

[0004] The utility model discloses a kind of integrated optical measurement gas chambers without optical fiber of hot and humid method and measuring instrument thereof for the technical problem that the existing hot and humid portable flue gas analyzer adopts optical fiber to connect light source and detector, instrument stability is low, cost is high, propose a kind of system stability can be improved, reduce maintenance rate.

[0005] In order to achieve the above purpose, the utility model adopts the technical scheme that:

[0006] An integrated optical measurement gas chamber without optical fiber of hot and humid method, comprising a spectrometer, an ultraviolet light source, a gas chamber body and a core connector, the gas chamber body comprises a cylinder, a main mirror seat is installed at the left end of the cylinder, a main mirror is installed inside the main mirror seat, a secondary mirror seat is installed at the right side of the cylinder, two secondary mirrors are installed inside the secondary mirror seat, and a temperature and humidity sensor for detecting the gas parameters in the cylinder is also installed on the cylinder.

[0007] The core connector is provided with a switching piece on the right side, the switching piece is connected with the main mirror seat through a heat insulation stud, an ultraviolet light source is installed on the upper end of the core connector, a 45-degree mirror is also installed in the core connector, ultraviolet light emitted by the ultraviolet light source is reflected by the 45-degree mirror and then enters the cylinder, and the left side of the core connector is connected with a spectrometer through a heat insulation plate and a fixing plate, and the ultraviolet light reaches the spectrometer after multiple reflections.

[0008] Preferably, an air outlet is arranged at the left end of the cylinder, and an air inlet is arranged on the secondary mirror seat.

[0009] Preferably, the core connector comprises a top plate, a middle connecting block and a bottom plate, the middle connecting block is provided with a light inlet and a light outlet, and the bottom plate is H-shaped.

[0010] Preferably, the heat insulation plate is made of polytetrafluoroethylene or rubber.

[0011] Preferably, the outer wall of the cylinder is provided with a heating film.

[0012] Preferably, the heat insulation stud is four.

[0013] The utility model also provides a measuring instrument, including sampling host computer, sampling pipe and above-mentioned integral type no optical fiber hot and humid method optical measurement gas chamber.

[0014] Preferably, the right end of the cylinder is installed in the sampling pipe.

[0015] Compared with the prior art, the utility model has the advantages and positive effects that:

[0016] The utility model discloses an integral type no optical fiber hot and humid method optical measurement gas chamber, which connects the core connector and the gas chamber body through four heat insulation studs, and sets a heat insulation plate between the core connector and the spectrometer, so that the high-temperature environment of the gas chamber body is isolated from the ultraviolet light source and the spectrometer, which can effectively prevent the ultraviolet light source and the spectrometer from being affected by high temperature and ensure the detection accuracy. The utility model cancels the optical fiber connection, reduces the system complexity and light loss, thereby enhancing the overall stability of the instrument, reducing the maintenance demand caused by optical fiber loss, and reducing the overall use cost. The no optical fiber design improves the ultraviolet light transmission efficiency, makes the detection sensitivity higher, and reduces the detection limit of pollutants.

[0017] The right end of the cylinder of the integral type no optical fiber hot and humid method optical measurement gas chamber directly extends into the sampling pipe, so that the measuring instrument has a compact structure and can directly sample in a high-temperature area without the need of adding a high-temperature sampling pipe, thereby facilitating on-site measurement. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a structural schematic view of the utility model measuring instrument;

[0019] Figure 2 Structure diagram of the integrated optical measurement gas chamber without optical fiber by hot and humid method of the utility model;

[0020] Figure 3 The utility model discloses an integrated optical measurement gas chamber without optical fiber by hot and humid method of the utility model's explosion view;

[0021] Figure 4 Structure diagram of the core connecting body of the integrated optical measurement gas chamber without optical fiber by hot and humid method of the utility model;

[0022] In the above figures: 1, sampling host computer;11, main control board;2, sampling tube;3, optical spectrometer;4, ultraviolet light source;5, gas chamber body;51, cylinder;52, main mirror seat;53, main mirror;54, secondary mirror seat;55, secondary mirror;56, temperature and humidity sensor;57, gas outlet;58, gas inlet;6, core connecting body;61, top plate;62, bottom plate;63, middle connecting block;64, adapter sheet;65, mirror hole;66, heat insulation plate;67, fixed plate;68, light inlet;69, light outlet;7, heat insulation stud;8, 45-degree mirror. Specific embodiments

[0023] In order to better understand the utility model, the following will be combined with the embodiment and make specific description.

[0024] Embodiment: as Figure 1 The utility model discloses a measuring instrument for measuring the concentration of SO2, NO, NO2 and other pollutants in flue gas, which comprises a sampling host computer 1 and a sampling tube 2 connected to the front end of the host computer.

[0025] As Figure 2 , Figure 3As shown, the integrated fiber-free hot and wet optical measurement gas chamber includes a spectrometer 3, an ultraviolet light source 4, a gas chamber body 5, and a core connector 6. The gas chamber body 5 includes a cylinder 51 for containing the gas to be detected, a main mirror seat 52 is installed at the left end of the cylinder 51, a light inlet hole 68 and a light outlet hole 69 are arranged on the main mirror seat 52, and a main mirror 53 is installed on the inner side of the main mirror seat 52. The right side of the cylinder 51 is installed with a secondary mirror seat 54, and two secondary mirrors 55 are installed on the inner side of the secondary mirror seat 54. The main mirror 53 and the secondary mirror 55 form a White cell structure to form a multiple reflection light path. In this embodiment, the distance between the two secondary mirrors 55 is 2mm, and the reflection light path is 8 times the length of the gas chamber. The outer wall of the cylinder 51 is provided with a heating film, and a temperature and humidity sensor 56 for detecting the gas parameters in the cylinder 51 is also installed on the cylinder 51. The heating film and the temperature and humidity sensor 56 are electrically connected with a main control board 11. The gas in the gas chamber body 5 can be heated to above 120℃ by the heating film to ensure that the moisture and other components in the flue gas do not condense at high temperature, thereby avoiding the loss of soluble components. The left end of the cylinder 51 is provided with a gas outlet nozzle 57 communicating with the inside of the cylinder 51, which extends through the main mirror seat 52 to the core connector 6 to facilitate the connection of the gas outlet pipeline. The secondary mirror seat 54 is provided with a gas inlet nozzle 58 for connecting the gas inlet pipeline.

[0026] As shown in the figure, Figure 4 The core connector 6 is used to connect the gas chamber body 5, the spectrometer 3 and the ultraviolet light source 4. The structure includes a top plate 61 and a bottom plate 62, and a connecting block 63 between the top plate 61 and the bottom plate 62. The bottom plate 62 is arranged in the shape of H, and the recess of the H-shaped bottom plate 62 can accommodate the gas outlet nozzle 57 to facilitate the connection of the pipeline, while reducing the weight of the instrument and increasing the portability of the instrument.

[0027] A conversion sheet 64 is installed on the right side of the core connector 6, and the conversion sheet 64 is provided with a light inlet hole 68 and a light outlet hole 69. The conversion sheet 64 is connected with the main mirror seat 52 through four heat insulation studs 7. The ultraviolet light source 4 is installed on the top plate 61 of the core connector 6. The core connector 6 is provided with a vertical mirror hole 65, a horizontal light inlet hole 68 and a light outlet hole 69, and a 45-degree mirror 8 is installed in the mirror hole 65. The left side of the core connector 6 is connected with the spectrometer 3 through a heat insulation plate 66 and a fixing plate 67. The heat insulation plate 66 and the fixing plate 67 are provided with a light outlet hole 69, and the heat insulation plate 66 is made of polytetrafluoroethylene or rubber material. The ultraviolet light emitted by the ultraviolet light source 4 is reflected by the 45-degree mirror 8 and enters the cylinder 51. After multiple reflections of the main mirror 53 and the secondary mirror 55 in the cylinder 51, the light is emitted. The emitted light is received and detected by the spectrometer 3, and then the concentration values of various gas components in the flue gas are calculated.

[0028] The core connecting body 6 and the gas chamber body 5 are connected through four heat insulation columns, and a heat insulation plate 66 is arranged between the core connecting body 6 and the spectrometer 3, so that the high-temperature environment of the gas chamber body 5 is isolated from the ultraviolet light source 4 and the spectrometer 3, the ultraviolet light source 4 and the spectrometer 3 can be effectively prevented from being affected by high temperature, and the detection precision is guaranteed. The optical fiber connection is cancelled, the system complexity and the light loss are reduced, the overall stability of the instrument is enhanced, the maintenance demand caused by the optical fiber loss is reduced, and the overall use cost is reduced. The ultraviolet light transmission efficiency is improved by the optical fiber-free design, the detection sensitivity is higher, and the detection limit of the pollutants is reduced.

[0029] The right end of the barrel 51 of the integrated optical measurement gas chamber without optical fiber is directly extended into the sampling pipe 2, the measurement instrument structure is compact, sampling in the high-temperature area is directly and conveniently realized, a high-temperature sampling pipe does not need to be additionally arranged, and on-site measurement is facilitated.

[0030] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any person skilled in the art can modify or change the above-mentioned technical content to equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification made on the basis of the technical essence of the present application to the above-mentioned embodiments still belongs to the protection scope of the present application technical scheme.

Claims

1. An integrated fiber-free hot-wet optical measurement gas cell, characterized by: The application relates to a gas chamber for optical measurement, which comprises a spectrometer, an ultraviolet light source, a gas chamber body and a core connector. The right side of the core connector is provided with a connecting piece, the connecting piece is connected with the main mirror seat through heat insulation studs, the upper end of the core connector is provided with the ultraviolet light source, a 45-degree mirror is arranged in the core connector, ultraviolet light emitted by the ultraviolet light source is reflected by the 45-degree mirror and then enters the cylinder, the left side of the core connector is connected with the spectrometer through a heat insulation plate and a fixing plate, and the ultraviolet light reaches the spectrometer after multiple reflections.

2. The integrated fiber-free hot-wet optical measurement gas cell of claim 1, wherein: The left end of the cylinder is provided with a gas outlet, and the secondary mirror seat is provided with a gas inlet.

3. The integrated fiber-free hot-wet optical measurement gas cell of claim 1, wherein: The core connector comprises a top plate, a middle connecting block and a bottom plate, the middle connecting block is provided with a light inlet hole and a light outlet hole, and the bottom plate is H-shaped.

4. The integrated fiber-free hot-wet optical measurement gas cell of claim 1, wherein: The heat insulation plate is made of polytetrafluoroethylene or rubber.

5. The integrated fiber-free hot-wet optical measurement gas cell of claim 1, wherein: The outer wall of the cylinder is provided with a heating film.

6. The integrated fiber-free hot-wet optical measurement gas cell of claim 1, wherein: The heat insulation stud is four.

7. A gauge, characterized by: The application further relates to a sampling main machine, a sampling tube and the integrated optical measurement gas chamber without optical fiber.

8. The gauge of claim 7, wherein: The right end of the cylinder is arranged in the sampling tube.

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