Measuring light path anti-interference device of laser gas analyzer

Abstract

The utility model discloses an anti-interference device for a measuring light path of a laser gas analyzer, which comprises a transmitting assembly, a receiving assembly, a connecting assembly arranged between the transmitting assembly and the receiving assembly, and a nitrogen purging pipeline communicated with the transmitting assembly and the receiving assembly, a first window and a second window are arranged at the two ends of the connecting assembly respectively, a first purging pipeline used for purging the first window and a second purging pipeline used for purging the second window are further arranged on the nitrogen purging pipeline, and a purging nozzle inserted into the to-be-detected gas pipeline is arranged at the joint of the connecting assembly and the to-be-detected gas pipeline. The purging nozzle is connected with a half-shielding pipe transversely arranged in the middle of the to-be-detected gas pipeline, and a detection opening is formed in the side, deviating from the flowing direction of gas in the to-be-detected gas pipeline, of the middle of the half-shielding pipe. The device solves the problems that an existing purging device is unstable in purging effect and unreliable in detection result, and a detection light path is prone to being blocked.

Description

TECHNICAL FIELD

[0001] The utility model relates to a laser gas analyzer, concretely relates to a laser gas analyzer measurement light path anti -interference device. BACKGROUND

[0002] In the converter steelmaking production process, the flue gas generated by converter smelting is transported to the cooling, dust removal device through the coal gas pipeline, and after purification treatment, it is sent into the gas tank for storage and use. By recycling and utilizing converter gas (mainly CO gas), it can make the converter process even the whole steel plant realize negative energy steelmaking. In order to effectively and safely recover the gas, it is necessary to monitor the CO and O2 in the gas at the key position in the recovery process in real time. The use of laser gas analyzer brings a new online detection means to the steel industry, which can improve the speed and efficiency of real-time gas analysis, significantly increase the effective time of converter gas recovery, and increase the efficiency of coal gas recovery by 3% to 5%. But the converter flue gas pipeline has large diameter, high dust content and high humidity. In the long-term operation of the laser gas analyzer, the dust and other pollutants in the process gas will pollute the optical elements and reduce the optical transmittance, thereby affecting the normal work of the system and misleading part of the qualified gas dispersion, which not only wastes energy but also pollutes the atmosphere. The existing light path purging device of the laser gas analyzer is designed as a point type double purging port to deal with the conditions of high temperature, high dust, high humidity (water content), multiple components and flammable and explosive sample gas, but the purging effect is unstable and cannot meet the application purpose of stable and reliable measurement. There is a significant gap between reliability, maintainability and other aspects and the objective requirements of engineering application. After the measurement light path is blocked, it is seriously dependent on manual cleaning, which becomes a bottleneck problem restricting the stable, coordinated, reliable and safe work of the converter gas composition online analysis system. CONTENT OF THE UTILITY MODEL

[0003] The utility model discloses a laser gas analyzer measurement light path anti -interference device to solve the problem of unstable purging effect of the present point type double purging port design.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] A laser gas analyzer measurement light path anti -interference device, including transmitting component, receiving component, set up in transmitting component and receiving component between and the middle part is used for with the gas pipeline of measuring to be connected connecting component and with transmitting component and receiving component intercommunication's nitrogen gas purging pipeline, the both ends of connecting component are equipped with first window and second window respectively, nitrogen gas purging pipeline is also equipped with respectively for blowing first window's first purging pipeline and for blowing second window's second purging pipeline, the connecting component is provided with the purging spout of inserting the gas pipeline of measuring to be connected at the connecting place of the gas pipeline of measuring to be connected, and the purging spout is connected with the half pipe that is transversely arranged in the middle part of the gas pipeline of measuring to be connected, and the detection port is formed in the side of half pipe middle part that is away from the gas flow direction in the gas pipeline of measuring to be connected.

[0006] Compared with the prior art, the utility model has the following beneficial effects:

[0007] 1. The stainless steel half-shading pipe is installed at the center of the measuring pipeline of the laser gas analyzer, a detection gap is formed at the center of the half-shading pipe, the flow rate of the converter gas containing suspended particulate matters through the center gap of the half-shading pipe is slowed down, the gravity of the suspended particulate matters accelerates the dust to fall down, the dust entering the stainless steel half-shading pipe is greatly reduced, and the gas analysis and detection accuracy is improved.

[0008] 2. The purge spout is installed on the measuring light path of the laser gas analyzer, the airflow outlet is designed as a tangent line spout (3mm*60°), industrial nitrogen is used for continuous purging, a shielding air curtain is formed to prevent the dust of the converter gas and other pollutants in the measured environment from gathering on the laser window, and long-term stable, reliable and accurate measurement of the laser gas analyzer under the conditions of high temperature, high dust, high humidity (containing water), multiple components and flammable and explosive sample gas is realized. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a schematic view of the measuring light path anti-interference device of the laser gas analyzer in the prior art.

[0010] Figure 2 It is a schematic view of the measuring light path anti-interference device of the laser gas analyzer in the prior art.

[0011] In the figure, 1 is a transmitting assembly, 2 is a receiving assembly, 3 is a connecting assembly, 4 is a pipeline of a gas to be measured, 5 is a nitrogen purging pipeline, 6 is a first window, 7 is a second window, 8 is a first purging pipeline, 9 is a second purging pipeline, 10 is a purging spout, 11 is a half-shading pipe, 12 is a detection port, 13 is a third gas purging pipeline, 14 is a positive pressure gas inlet pipeline, and 15 is a balance pipeline. DETAILED DESCRIPTION

[0012] The utility model will be further explained in combination with the drawings.

[0013] Reference is made to the utility model patent CN201822087080.5 and the drawings attached to the present application Figure 1The existing laser gas analyzer's measurement optical path anti-interference device includes a transmitting component 1, a receiving component 2, a connecting component 3 located between the transmitting component 1 and the receiving component 2 and connected in the middle to the gas pipeline 4 to be measured, and a nitrogen purging pipeline 5 connected to the transmitting component 1 and the receiving component 2. The two ends of the connecting component 3 are respectively provided with a first viewing window 6 and a second viewing window 7. The nitrogen purging pipeline 5 is also provided with a first purging pipe 8 for purging the first viewing window 6 and a second purging pipe 9 for purging the second viewing window 7. A positive pressure gas inlet pipe 14 is connected to the transmitting component 1, and a balance pipe 15 is connected between the transmitting component 1 and the receiving component 2, forming a positive pressure gas passage between the positive pressure gas inlet pipe 14 and the balance pipe 15.

[0014] The aforementioned point-to-point dual-purge port design still suffers from unstable purging effects when dealing with high temperature, high dust, high humidity (containing water), multi-component, and flammable and explosive sample gas conditions. It fails to achieve the application purpose of stable and reliable measurement and has significant gaps in terms of reliability and ease of maintenance compared to the objective requirements of engineering applications.

[0015] Therefore, this utility model discloses an anti-interference device for the measurement optical path of a laser gas analyzer, including a transmitting component 1, a receiving component 2, a connecting component 3 disposed between the transmitting component 1 and the receiving component 2 and connected in the middle to the gas pipeline 4 to be measured, and a nitrogen purging pipeline 5 connected to the transmitting component 1 and the receiving component 2. The two ends of the connecting component 3 are respectively provided with a first viewing window 6 and a second viewing window 7. The nitrogen purging pipeline 5 is also provided with a first purging pipe 8 for purging the first viewing window 6 and a second purging pipe 9 for purging the second viewing window 7. A positive pressure gas inlet pipe 14 is connected to the transmitting component 1, and a balance pipe 15 is connected between the transmitting component 1 and the receiving component 2, forming a positive pressure gas passage between the positive pressure gas inlet pipe 14 and the balance pipe 15.

[0016] A purge nozzle 10 is provided at the connection point between the connecting component 3 and the gas pipeline 4 to be tested, and the purge nozzle 10 is connected to a semi-obstruction tube 11 placed horizontally in the middle of the gas pipeline 4 to be tested. A detection port 12 is provided on the side of the semi-obstruction tube 11 away from the gas flow direction in the gas pipeline 4 to be tested.

[0017] Specifically, the nozzle size of the purge nozzle 10 is Φ3mm×60°. The opening size of the detection port 12 is related to the diameter of the gas pipeline 4 to be tested by a ratio of 1:(2~3). A third purge pipeline 13 connected to the purge nozzle 10 is also provided on the nitrogen purge pipeline 5.

[0018] In use, a Ф50mm semi-shielded tube 11 is installed in the gas pipeline 4 with a diameter of 1000mm. A 400mm gap is made at the center of the semi-shielded tube on the side opposite to the gas flow direction. The gas flow velocity of the converter gas containing suspended particles slows down at the center (400mm) gap of the semi-shielded tube. The gravity of the suspended particles will cause the dust to fall downwards at an accelerated rate, greatly reducing the amount of dust entering the steel semi-shielded tube, improving the accuracy of detection and analysis, and avoiding contamination of the detection optical path. At the same time, the purging nozzles 10 connected to both ends of the semi-shielded tube 11 and the third purging pipe 13 connected to the purging nozzles 10 are used to increase the purging pressure and form a shielding air curtain to prevent dust in the converter gas and other pollutants in the measured environment from accumulating on the first window 6 and the second window 7. This enables the laser gas analyzer to perform long-term stable, reliable, and accurate measurements under conditions of high temperature, high dust, high humidity (containing water), multi-component, and flammable and explosive sample gas.

Claims

1. An anti-interference device for the measurement optical path of a laser gas analyzer, comprising a transmitting component (1), a receiving component (2), a connecting component (3) disposed between the transmitting component (1) and the receiving component (2) and connected in the middle to a gas pipeline (4) to be measured, and a nitrogen purging pipeline (5) connected to the transmitting component (1) and the receiving component (2), wherein the two ends of the connecting component (3) are respectively provided with a first viewing window (6) and a second viewing window (7), and the nitrogen purging pipeline (5) is further provided with a first purging pipe (8) for purging the first viewing window (6) and a second purging pipe (9) for purging the second viewing window (7), characterized in that: The connection assembly (3) is provided with a purge nozzle (10) for inserting into the gas pipe (4) under test at the connection point of the connection assembly (3). The purge nozzle (10) is connected to a semi-obstruction tube (11) placed horizontally in the middle of the gas pipe (4) under test. A detection port (12) is provided on the side of the semi-obstruction tube (11) away from the gas flow direction inside the gas pipe (4) under test.

2. The anti-interference device for the measurement optical path of a laser gas analyzer as described in claim 1, characterized in that: The nozzle size of the purging nozzle (10) is Φ3mm×60°.

3. The anti-interference device for the measurement optical path of a laser gas analyzer as described in claim 1, characterized in that: The opening size of the detection port (12) is related to the diameter of the gas pipeline (4) to be tested by a ratio of 1:(2~3).

4. The anti-interference device for the measurement optical path of a laser gas analyzer as described in claim 1, characterized in that: The nitrogen purging pipeline (5) is also provided with a third purging pipeline (13) connected to the purging nozzle (10).

5. The anti-interference device for the measurement optical path of a laser gas analyzer as described in claim 1, characterized in that: The transmitting component (1) is connected to a positive pressure gas inlet pipe (14), and a balance pipe (15) is connected between the transmitting component (1) and the receiving component (2), forming a positive pressure gas passage between the positive pressure gas inlet pipe (14) and the balance pipe (15).

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