Rotational flow positive pressure protection device for laser back scattering type dust meter

Abstract

The utility model relates to a rotational flow positive pressure protection device for a laser back scattering type dust meter, which comprises a dust meter, a positive pressure pipe and a flue, one end of the positive pressure pipe is connected with the dust meter, and the other end of the positive pressure pipe is connected with the flue; a plurality of air compression pipes communicated with the inner wall of the positive pressure pipe are evenly distributed in the circumferential direction of the positive pressure pipe, and the diameter of the air compression pipes is smaller than that of the positive pressure pipe. The free end of the air compression pipe points to the direction of the dust meter, and a first included angle is formed between the axis of the air compression pipe and the axis of the positive pressure pipe; a second included angle is formed between the tangent line of the joint of the air compression pipe and the positive pressure pipe and the axis of the positive pressure pipe. The positive pressure pipe is arranged between the dust meter and the flue, gas entering from the air compression pipe forms rotating airflow in the positive pressure pipe, the free end of the air compression pipe points to the direction of the dust meter, it is ensured that air flows towards the flue side, and dust and particles are prevented from entering the dust meter and polluting optical elements of the dust meter.

Description

Technical Field

[0001] The utility model belongs to the technical field of flue dust detection, in particular to a swirl positive pressure protection device for a laser backscattering dust monitor. Background Art

[0002] Flue dust detection is usually monitored by a laser backscattering dust monitor. The laser backscattering dust monitor is installed on one side of the flue. Its laser source emits a laser beam to the opposite side of the flue. At this time, the detector on the same side as the laser source detects the intensity of the light backscattered by the dust. This light intensity is proportional to the dust concentration, so the dust concentration is obtained by the detected light intensity.

[0003] Currently, when using laser backscattering dust monitors to detect flues, when the process of the main production device changes or the operation of the exhaust emission facilities changes, the static pressure of the exhaust gas will fluctuate, which can easily cause the optical components to be contaminated by particulate matter and the monitoring data to be abnormal. Utility Model Content

[0004] The utility model aims to provide a swirl positive pressure protection device for a laser backscattering dust monitor, so as to solve the technical problems raised in the background technology.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A swirl positive pressure protection device for a laser backscatter dust monitor, comprising: a dust monitor, a positive pressure tube, and a flue, wherein one end of the positive pressure tube is connected to the dust monitor and the other end is connected to the flue; a plurality of air compression tubes are evenly distributed around the circumference of the positive pressure tube and penetrate the inner wall of the positive pressure tube, wherein the diameter of the air compression tube is smaller than that of the positive pressure tube;

[0007] The free end of the air compression tube points toward the dust monitor and a first angle is formed between its axis and the axis of the positive pressure tube; and a second angle is formed between the tangent line at the connection between the air compression tube and the positive pressure tube and the axis of the positive pressure tube.

[0008] As a further improvement of the present invention, the first angle is 45°, and the second angle is 45°.

[0009] As a further improvement of the present invention, three air compression tubes are evenly distributed on the circumference of the positive pressure tube and pass through the inner wall of the positive pressure tube.

[0010] As a further improvement of the present invention, a connection hole is provided at the end of the positive pressure pipe, and the positive pressure pipe is connected to the dust monitor and the flue through flanges through the connection hole.

[0011] As a further improvement of the present invention, the dust monitor is provided with two purge air pipelines, which are located above and below the optical element inside the dust monitor and are both arranged horizontally.

[0012] The beneficial effects of adopting the above technical solution are:

[0013] The utility model arranges a positive pressure tube between the dust monitor and the flue, and an air compression tube is arranged on the positive pressure tube. On the one hand, the gas entering from the air compression tube forms a rotating airflow (vortex) in the positive pressure tube, thereby preventing dust and particles in the flue from entering the interior of the dust monitor and contaminating its optical components after the static pressure of the flue fluctuates. On the other hand, the free end of the air compression tube points to the direction of the dust monitor, which can ensure that the air flows toward the flue side, and can also prevent dust and particles from entering the interior of the dust monitor and contaminating its optical components.

[0014] The utility model horizontally arranges two purge air pipelines to purge in the same direction on the upper and lower sides of the optical element to clean the optical element, while enhancing the flow of the protective gas in the positive pressure pipe toward the flue, thereby enhancing the function of the positive pressure pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front view of the positive pressure tube of the present utility model;

[0016] Figure 2 It is a side view of the positive pressure tube of the present utility model;

[0017] Figure 3 It is a top view of the positive pressure tube of the present utility model;

[0018] Figure 4 This is a schematic diagram of the installation position of the purge air pipeline of the present invention;

[0019] Explanation of the marks in the figure: 1 dust monitor, 2 positive pressure pipe, 3 air compression pipe, 4 purge air pipeline, 5 optical element, 6 flange, a first angle, b second angle. DETAILED DESCRIPTION

[0020] In order to better understand the purpose, structure and function of the present invention, the present invention is clearly and completely described below in conjunction with the accompanying drawings.

[0021] like Figures 1-4The device shown is a cyclonic positive pressure protection device for a laser backscatter dust monitor 1, comprising: a dust monitor 1, a positive pressure tube 2, and a flue. The positive pressure tube 2 is connected to the dust monitor 1 at one end and to the flue at the other end. The dust monitor 1 in this device is a laser backscatter dust monitor 1. Specifically, the positive pressure tube 2 has a connecting hole (not shown) at the end, through which it is connected to the dust monitor 1 and the flue via a flange 6.

[0022] Multiple compressed air tubes 3 are evenly distributed around the circumference of the positive pressure tube 2, extending through its inner wall. The diameter of each compressed air tube 3 is smaller than that of the positive pressure tube 2. In this embodiment, the positive pressure tube 2 is a DN100 tube with a length of 150 mm; the compressed air tube 3 is a DN10 mm tube, and its distance from the optical element 5 of the dust monitor 1 is 40 mm. Furthermore, three compressed air tubes 3 are evenly distributed around the circumference of the positive pressure tube 2, extending through its inner wall.

[0023] Compressed air entering the compressed air pipe 3 forms a swirling airflow within the positive pressure pipe 2, generating a vortex that improves the stability of the protective air and prevents dust and particulate contamination of the optical elements. A second angle b is formed between the tangent line at the connection between the compressed air pipe 3 and the positive pressure pipe 2 and the axis of the positive pressure pipe 2. This angle b is 45°. In this embodiment, the protective air refers to the gas entering the positive pressure pipe 2 from the compressed air pipe 3. To ensure that the protective air ultimately flows to the flue gas monitoring side and prevent flue gas particulates and impurities from contaminating the optical elements, the compressed air pipe, after entering tangentially, is blown toward the flue gas side from the optical element 5 to ensure the fluidity of the protective air within the positive pressure pipe 2. The free end of the compressed air pipe 3 points toward the dust monitor 1, and its axis forms a first angle a with the axis of the positive pressure pipe 2. This first angle a is 45°. Because the compressed air within the positive pressure pipe 2 forms a swirling airflow toward the flue gas side, it ensures the proper operation of the laser monitoring system of the optical element 5 while reducing the probability of contamination.

[0024] The original dust monitor 1's purge air was set to blow parallel to the optical element 5, meaning the purge air pipe was arranged vertically. This only had a certain cleaning effect on the contaminated original components. However, if the compressed air was dry or degreasing was abnormal, it would accelerate the contamination of the optical element 5. In this embodiment, the dust monitor 1 is equipped with two purge air pipelines 4. These two purge air pipelines 4 are located above and below the optical element 5 inside the dust monitor 1 and are arranged horizontally. This avoids contamination caused by unclean air and strengthens the function of the positive pressure pipe 2, enhancing the flow of protective gas within the positive pressure pipe 2 toward the flue.

[0025] It is understood that the present invention is described by way of certain embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A cyclone positive pressure protection device for a laser backscatter dust monitor, characterized by: It includes: A dust monitor (1), a positive pressure tube (2) and a flue, wherein one end of the positive pressure tube (2) is connected to the dust monitor (1) and the other end is connected to the flue; a plurality of air compression tubes (3) are evenly distributed on the circumference of the positive pressure tube (2) and are connected to the inner wall thereof, and the diameter of the air compression tube (3) is smaller than the diameter of the positive pressure tube (2); The free end of the air compression tube (3) points in the direction of the dust monitor (1), and a first angle (a) is formed between the axis of the air compression tube (3) and the axis of the positive pressure tube (2); and a second angle (b) is formed between the tangent line at the connection between the air compression tube (3) and the positive pressure tube (2) and the axis of the positive pressure tube (2).

2. The cyclone positive pressure protection device for a laser backscatter dust monitor according to claim 1, characterized in that: The first angle (a) is 45°, and the second angle (b) is 45°.

3. The cyclone positive pressure protection device for a laser backscatter dust monitor according to claim 1, characterized in that: Three air compression pipes (3) are evenly distributed in the circumferential direction of the positive pressure pipe (2) and are connected to the inner wall thereof.

4. The cyclone positive pressure protection device for a laser backscatter dust monitor according to claim 1, characterized in that: The end of the positive pressure pipe (2) is provided with a connection hole, and the positive pressure pipe (2) is connected to the dust monitor (1) and the flue through the flange (6) through the connection hole.

5. The cyclone positive pressure protection device for a laser backscatter dust monitor according to claim 1, characterized in that: The dust monitor (1) is provided with two purge air pipelines (4), which are located above and below an optical element (5) inside the dust monitor (1) and are both arranged horizontally.

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