Flue gas oxygen content detection device

Abstract

The utility model belongs to the technical field of testing equipment, and particularly relates to a flue gas oxygen content detection device which comprises a probe body horizontally arranged in a flue, a filter is detachably arranged at the front end of the probe body, a flow guide cap is rotatably arranged at the gas inlet end of the filter, and a gas inlet window is formed in the flow guide cap. The rear end of the probe main body is hermetically communicated with an elbow connecting piece, the elbow connecting piece is integrally positioned outside the flue, the elbow connecting piece comprises a horizontal sampling section and a vertical connecting section which are communicated with each other and arranged in an L shape, one end of the horizontal sampling section is fixed on the outer wall of the flue, and the other end of the horizontal sampling section is communicated with the vertical connecting section; one end, far away from the horizontal sampling section, of the vertical connecting section is connected with an oxygen content analyzer. The device can keep long-term and stable sampling capacity when the flow direction of flue gas is unstable, and can adapt to field installation conditions with narrow space.

Description

Technical Field

[0001] This utility model belongs to the field of testing equipment technology, specifically relating to a device for detecting the oxygen content in flue gas. Background Technology

[0002] In industrial combustion and environmental monitoring, accurate measurement of flue gas oxygen content is crucial for optimizing combustion efficiency and reducing pollutant emissions. Currently widely used flue gas oxygen content detection devices still have significant shortcomings under complex conditions such as high dust and high humidity: First, the filters at the front end of existing flue gas oxygen content detection devices are mostly fixed structures, and their air inlet direction cannot adapt to change. In high-dust flue gas environments, when the flue gas flow direction is unstable or the flow velocity is low, the fixed air inlet cannot always be aligned with the mainstream flue gas, resulting in low sampling efficiency, slow measurement response, and insufficient data representativeness. Second, the overall structural layout of existing flue gas oxygen content detection devices is not reasonable enough, posing potential installation and operational risks. Most flue gas oxygen content detection devices adopt an integrated horizontal insertion design, requiring a large lateral space for installation, making construction difficult in situations where space around the flue is narrow.

[0003] Chinese patent CN217717667U discloses a tool for measuring the oxygen content of flue gas at the inlet and outlet of an air preheater, including a flue gas analyzer and a stainless steel probe. The stainless steel probe is a hollow steel tube with a length of not less than 3 meters. One end of the hollow steel tube is connected to the gas guide tube of the flue gas analyzer, and the other end is closed. Smoke collection holes are evenly spaced along the length of one side of the hollow steel tube. This patent ensures sufficient insertion depth, and the smoke collection holes are perpendicular to the flue gas flow direction, fully meeting the needs for accurate detection of oxygen content at the inlet and outlet of the air preheater. It has advantages such as simple structure, ease of use, and accurate detection. However, the smoke collection holes in this patent are a fixed structure. When the flue gas flow direction is unstable or the flow velocity is low, the fixed-direction smoke collection holes cannot be continuously and efficiently aligned with the mainstream flue gas, resulting in decreased sampling efficiency and slow response. Utility Model Content

[0004] The purpose of this invention is to provide a flue gas oxygen content detection device that can maintain long-term and stable sampling capability when the flue gas flow direction is unstable or the flow rate is low, while also being able to adapt to the installation conditions of industrial sites with narrow spaces and dense layouts.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A flue gas oxygen content detection device includes a probe body horizontally arranged in a flue. A filter is detachably arranged at the front end of the probe body. A flow guide cap is rotatably arranged at the air inlet end of the filter. An air inlet window is provided on the flow guide cap. The rear end of the probe body is hermetically connected to an elbow connector. The elbow connector is entirely located outside the flue. The elbow connector includes a horizontal sampling section and a vertical connection section that are connected to each other and arranged in an L shape. One end of the horizontal sampling section is fixed on the outer wall of the flue, and the other end of the horizontal sampling section is connected to the vertical connection section. The end of the vertical connection section far from the horizontal sampling section is connected to an oxygen content analyzer.

[0007] Further, the filter is integrally arranged in a cylindrical shape, and a ceramic filter element is arranged inside the filter.

[0008] Further, an internal thread is provided at one end of the filter close to the probe body, and an external thread matching the internal thread is provided at one end of the probe body close to the filter.

[0009] Further, the flow guide cap includes a gas collection cylinder and a deflection plate fixedly connected. The deflection plate is fixedly arranged at one end of the gas collection cylinder, and the plane of the deflection plate is arranged at an inclined angle with the axis of the gas collection cylinder.

[0010] Further, the degree of the inclined angle is between 25 - 35°.

[0011] Further, the air inlet window is provided on the side wall of the gas collection cylinder.

[0012] Further, a support frame is fixedly arranged at the air inlet end of the filter, and a support bracket link is hinged on the support frame.

[0013] Further, the end of the support bracket link far from the support frame is fixedly connected to the gas collection cylinder.

[0014] Further, the support frame is integrally arranged in an inverted "U" shape.

[0015] Further, one end of the horizontal sampling section is fixed on the outer wall of the flue through a mounting flange.

[0016] The beneficial effects of the present utility model are as follows:

[0017] By setting the flow guide cap and the elbow connector, the present utility model solves the defects of low sampling efficiency of the fixed filter and high installation space requirements for the horizontal insertion structure in the prior art. The flow guide cap can automatically rotate along with the flue gas flow direction, so that its air inlet window can always actively align with the mainstream flue gas, ensuring that the collected gas sample can truly reflect the average oxygen content in the flue. The elbow connector is located outside the flue and arranged in an L shape, reducing the installation and operation space required by the device in the radial direction of the flue, enhancing the adaptability of the device to narrow sites, and facilitating installation and maintenance. Brief Description of the Drawings

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the present invention without the probe body, the elbow connector and the oxygen content analyzer;

[0020] Figure 3 This is a schematic diagram of the elbow connector in this utility model;

[0021] Figure 4 This is a schematic diagram of the oxygen content analyzer in this utility model;

[0022] In the picture:

[0023] 1. Probe body; 2. Filter; 3. Flow guide cap; 301. Gas collection cylinder; 302. Deflector plate; 4. Air inlet window; 5. Elbow connector; 501. Horizontal sampling section; 502. Vertical connecting section; 6. Oxygen content analyzer; 7. Support frame; 8. Support rod. Detailed Implementation

[0024] The present invention will now be described and illustrated in detail with reference to the embodiments.

[0025] Example 1

[0026] like Figure 1-4 As shown, the flue gas oxygen content detection device includes a probe body 1 horizontally installed in the flue. A filter 2 is detachably installed at the front end of the probe body 1. A guide cap 3 is rotatably installed at the air inlet end of the filter 2. An air inlet window 4 is opened on the guide cap 3. The rear end of the probe body 1 is sealed and connected to an elbow connector 5. The elbow connector 5 is located outside the flue. The elbow connector 5 includes a horizontal sampling section 501 and a vertical connecting section 502 that are interconnected and arranged in an L-shape. One end of the horizontal sampling section 501 is fixed to the outer wall of the flue. The other end of the horizontal sampling section 501 is connected to the vertical connecting section 502. The end of the vertical connecting section 502 away from the horizontal sampling section 501 is connected to an oxygen content analyzer 6.

[0027] The filter 2 is cylindrical in shape and contains a ceramic filter element.

[0028] The filter 2 has an internal thread at one end near the probe body 1, and the probe body 1 has an external thread that mates with the internal thread at one end near the filter 2.

[0029] The flow guide cap 3 includes a fixedly connected air collecting cylinder 301 and a deflector 302. The deflector 302 is fixedly installed at one end of the air collecting cylinder 301, and the plane of the deflector 302 is inclined at an angle to the axis of the air collecting cylinder 301.

[0030] The degree of the inclination angle is between 25° and 35°.

[0031] The intake window 4 is arranged on the side wall of the air collecting cylinder 301.

[0032] A support frame 7 is fixedly arranged at the intake end of the filter 2, and a support link 8 is hingedly arranged on the support frame 7.

[0033] One end of the support link 8 far from the support frame 7 is fixedly connected to the air collecting cylinder 301.

[0034] The support frame 7 is integrally arranged in an inverted "U" shape.

[0035] One end of the horizontal sampling section 501 is fixedly mounted on the outer wall of the flue through a mounting flange.

[0036] Working principle and process:

[0037] When the device starts to work, the flue gas in the flue impacts the deflector cap 3. Since the deflecting plate 302 at the front end of the deflector cap 3 is inclined, the acting force generated by the flue gas on the surface of the deflecting plate 302 will cause the entire deflector cap 3 to rotate automatically until the intake window 4 on the side wall of the air collecting cylinder 301 is stably aligned with the direction of the incoming flue gas. Thereafter, the flue gas enters the interior of the deflector cap 3 at the best angle through the intake window 4 and then immediately enters the filter 2 connected thereto. When the flue gas passes through the ceramic filter element filled inside the filter 2, the dust particles therein are effectively intercepted and preliminarily purified.

[0038] The purified clean flue gas passes through the filter 2 and enters the horizontally arranged probe body 1. The flue gas continues to flow inside the probe body 1 and enters the elbow connector 5 located outside the flue. The flue gas first flows through the horizontal sampling section 501 of the elbow connector 5, then changes direction and enters its vertical connection section 502 to continue flowing. Finally, the flue gas is discharged from the outlet of the vertical connection section 502 and enters the oxygen content analyzer 6. The oxygen content analyzer 6 performs real-time analysis on the continuously fed clean flue gas and measures the oxygen content therein, thus completing the entire detection process.

Claims

1. A flue gas oxygen content detection device, comprising a probe body (1) horizontally arranged in a flue, characterized in that, A filter (2) is detachably provided at the front end of the probe body (1). A flow guide cap (3) is rotatably provided at the air inlet end of the filter (2). An air inlet window (4) is provided on the flow guide cap (3). A elbow connector (5) is hermetically connected to the rear end of the probe body (1). The elbow connector (5) is entirely located outside the flue. The elbow connector (5) includes a horizontal sampling section (501) and a vertical connection section (502) that are connected to each other and arranged in an L shape. One end of the horizontal sampling section (501) is fixed on the outer wall of the flue. The other end of the horizontal sampling section (501) is connected to the vertical connection section (502). The end of the vertical connection section (502) away from the horizontal sampling section (501) is connected to an oxygen content analyzer (6).

2. The flue gas oxygen content detection device according to claim 1, characterized in that, The filter (2) is integrally arranged in a cylindrical shape, and a ceramic filter element is provided inside the filter (2).

3. The flue gas oxygen content detection device according to claim 1, characterized in that, An internal thread is provided at one end of the filter (2) close to the probe body (1), and an external thread matching the internal thread is provided at one end of the probe body (1) close to the filter (2).

4. The flue gas oxygen content detection device according to claim 1, characterized in that, The flow guide cap (3) includes a gas collection cylinder (301) and a deflection plate (302) fixedly connected. The deflection plate (3rd02) is fixedly provided at one end of the gas collection cylinder (301), and the plane of the deflection plate (302) is arranged at an inclined angle with the axis of the gas collection cylinder (301).

5. The flue gas oxygen content detection device according to claim 4, characterized in that, The degree of the inclined angle is between 25 - 35°.

6. The flue gas oxygen content detection device according to claim 4, characterized in that, The air inlet window (4) is provided on the side wall of the gas collection cylinder (30).

7. The flue gas oxygen content detection device according to claim 4, characterized in that, A support frame (7) is fixedly provided at the air inlet end of the filter (2), and a support link (8) is hinged on the support frame (7).

8. The flue gas oxygen content detection device according to claim 7, characterized in that, The end of the support link (8) away from the support frame (7) is fixedly connected to the gas collection cylinder (301).

9. The flue gas oxygen content detection device according to claim 7, characterized in that, The support frame (7) is integrally arranged in an inverted "U" shape.

10. The flue gas oxygen content detection device according to claim 1, characterized in that, One end of the horizontal sampling section (501) is fixed on the outer wall of the flue through a mounting flange.

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