Visual soot blower adopting compressed air as soot blowing medium and method thereof

Abstract

The invention discloses a visual soot blower adopting compressed air as a soot blowing medium and a method of the visual soot blower. The end portion of the tail end of the soot blowing gun barrel is closed, soot blowing nozzles are symmetrically arranged on the two sides of the side wall close to the end portion of the tail end of the soot blowing gun barrel, a reflection type flow guide block with two reflection faces is fixedly arranged at the position, between the two soot blowing nozzles, in the soot blowing gun barrel, and a camera is arranged on the central axis of the soot blowing gun barrel. The camera faces the end part of the tail end of the soot blowing gun barrel along the central axis of the soot blowing gun barrel; compressed air enters from the other end opposite to the end part of the tail end of the soot blowing gun barrel, is reflected by the reflecting surface and guided into the two soot blowing nozzles, and is blown to the surface to be detected through the two soot blowing nozzles for soot blowing operation. The cooling device has the beneficial effects that the cooling effect on the soot blowing gun barrel is good, the system safety is improved, damage is not likely to happen, the service life is long, the flow guiding effect is good, and the soot blowing effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of boilers, and particularly relates to a visual soot blower using compressed air as a soot blowing medium and a method thereof. Background Art

[0002] During the operation of a coal-fired boiler, ash deposition and coking inevitably occur on the heating surface, resulting in deteriorated heat transfer, reduced boiler thermal efficiency, increased flue gas temperature, and thus fuel waste. Ash deposition may also cause overheating of the heating surface, exacerbate corrosion, and shorten the service life of the boiler. In addition, ash deposition may cause an increase in flue gas duct resistance, increase auxiliary power consumption, and affect the normal operation of the boiler. Therefore, soot blowing of the heating surface is a necessary means to ensure the safe and economic operation of a coal-fired boiler, which can remove ash deposition and coking on the heating surface, restore its heat transfer performance, improve boiler thermal efficiency, and prevent overheating and corrosion caused by ash deposition.

[0003] At present, high-pressure and high-temperature steam is mainly used as the soot blowing medium for coal-fired boiler soot blowers. The reason is that steam has high energy, can form a high-speed steam flow at the nozzle, generate a large impact force, and effectively remove ash deposition and slag on the heating surface. In addition, as a by-product of boiler operation, steam is easy to obtain and has high economy, so it has been widely promoted in industrial applications. However, the high-speed ejected steam flow strongly impacts the heating surface pipe wall, has strong abrasiveness in a high-dust environment, and is prone to thermal fatigue and even local corrosion of the pipe material due to the influence of high temperature. Long-term use may lead to pipeline leakage or breakage, seriously affecting the safe operation and service life of the boiler. In recent years, there have been many accidents such as boiler tube bursts caused by the heating surface being damaged by steam soot blowers in power plants, resulting in huge economic losses.

[0004] In contrast, compressed air soot blowing is a feasible alternative. When using the high-pressure kinetic energy of compressed air to remove ash scale, due to the low temperature of the medium and no water, it can effectively avoid the thermal shock of high temperature to the pipeline, reduce the risk of heating surface wear and corrosion, and at the same time has the advantages of simple operation, convenient maintenance and low operation cost.

[0005] In addition, the existing power plant boiler soot blowing system has limited means for evaluating the soot blowing effect. In most cases, the frequency and time of soot blowing are determined only by experience. Some researchers have proposed a method of intelligent soot blowing relying on temperature and pressure measuring points on the heating surface, but the system is complex and the reliability is general. There are also some applications using means such as CCD cameras to monitor the soot blowing effect in the furnace. However, due to the high temperature in the furnace, the camera is extremely easy to be damaged, and a complex cooling system needs to be arranged, which affects its popularization. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, the present invention provides a visual soot blower using compressed air as the soot blowing medium and its method, which solves the problem that soot blowing cannot be visualized, has good diversion effect, good safety, is not easily damaged, and has a long service life.

[0007] The technical solution of the present invention is as follows:

[0008] I. A visual soot blower using compressed air as the soot blowing medium:

[0009] The visual soot blower includes a soot blowing barrel, a soot blowing nozzle, a reflective diversion block, and a camera. The end of the soot blowing barrel is closed, and soot blowing nozzles are symmetrically arranged on both sides of the side wall near the end. A reflective diversion block with two reflective surfaces is fixedly arranged at a position inside the soot blowing barrel between the two soot blowing nozzles. A camera is arranged on the central axis of the soot blowing barrel, and the camera faces the end of the soot blowing barrel along the central axis of the soot blowing barrel.

[0010] The two reflective surfaces of the reflective diversion block are arranged perpendicular to each other at 90 degrees.

[0011] One part of each of the two reflective surfaces of the reflective diversion block faces the two soot blowing nozzles respectively, and the other part faces the camera.

[0012] Each reflective surface of the reflective diversion block forms an angle of 45 degrees with the axial direction of the soot blowing nozzle and the orientation of the camera respectively.

[0013] The camera is connected to an external controller via a camera signal line.

[0014] Compressed air enters from the end of the soot blowing barrel opposite to the end, is reflected by the reflective surface and diverted into the two soot blowing nozzles, and is blown towards the surface to be measured through the two soot blowing nozzles for soot blowing operation.

[0015] II. A visual soot blowing method using compressed air as the soot blowing medium, the method is as follows:

[0016] The soot blowing medium is introduced from one end of the soot blowing barrel and ejected from the two soot blowing nozzles at the other end to form a soot blowing jet, and the soot blowing jet is blown towards the surface to be measured for soot blowing operation; the soot blowing jet is reflected by the reflective surface and diverted into the two soot blowing nozzles, thereby accelerating the speed of the soot blowing jet. At the same time, the ash accumulation image on the heated surface of the surface to be measured passes through the soot blowing nozzle and is then reflected to the camera by the reflective surface of the reflective diversion block, realizing the visualization of the real-time soot blowing operation.

[0017] The heated surface refers to the heat exchanger of the boiler, usually called the "heated surface".

[0018] The method uses compressed air as the soot blowing medium, with a pressure of 0.7 - 1.2 MPa and a temperature of normal temperature.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. By using compressed air as the sootblowing medium, it has a good cooling effect on the sootblowing gun barrel and will not cause erosion or thermal shock to the boiler heating surface tube wall, improving the system safety.

[0021] 2. A camera is installed inside the sootblowing gun barrel for visualization. The camera is protected by the normal-temperature compressed air flow, is not easily damaged, and has a long service life.

[0022] 3. The reflective deflector not only has the function of reflecting light to visualize the fouling state of the heating surface, but also has a guiding effect, reducing the pressure loss of the sootblowing jet and increasing the jet rigidity, improving the sootblowing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 FIG. is a schematic structural diagram of a visualization sootblower using compressed air as the sootblowing medium according to the present invention;

[0025] In the figure, 1 - sootblowing gun barrel; 2 - sootblowing nozzle; 3 - reflective deflector; 3.1 - reflecting surface; 4 - camera; 4.1 - camera signal line.

[0026] Figure 2 FIG. is a schematic flow diagram of the sootblowing medium (i.e., compressed air), and the arrow indicates its flow direction.

[0027] Figure 3 FIG. is an optical path diagram, and the arrow indicates the light direction. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following will further describe the present invention in detail with reference to the drawings and embodiments. It should be noted that the following embodiments are intended to facilitate the understanding of the present invention and do not limit it in any way.

[0029] As Figure 1As shown in the figure, the device includes a soot blowing barrel 1, soot blowing nozzles 2, a reflective flow guide block 3, and a camera 4. The end of the soot blowing barrel 1 is closed, and two soot blowing nozzles 2 are symmetrically arranged on both sides of the side wall near the end. The two soot blowing nozzles are symmetrically arranged on both sides. A reflective flow guide block 3 with two reflecting surfaces 3.1 is fixedly arranged at a fixed position inside the soot blowing barrel 1 between the two soot blowing nozzles. A camera 4 is fixedly arranged on the central axis of the soot blowing barrel 1, and the camera 4 faces the end of the soot blowing barrel 1 along the central axis of the soot blowing barrel 1.

[0030] In a specific implementation, the two reflecting surfaces 3.1 of the reflective flow guide block 3 are arranged perpendicular to each other at 90 degrees. One part of each of the two reflecting surfaces 3.1 of the reflective flow guide block 3 faces the two soot blowing nozzles 2, and the other part faces the camera 4.

[0031] More specifically, each reflecting surface 3.1 of the reflective flow guide block 3 forms an angle of 45 degrees with the axial direction of the soot blowing nozzle 2 and the orientation of the camera 4 respectively.

[0032] The camera 4 is connected to an external controller via a camera signal line 4.1.

[0033] As Figure 2 shown, compressed air enters from the other end opposite to the end of the soot blowing barrel 1, is reflected and guided by the reflecting surface 3.1 into the two soot blowing nozzles 2, and is blown onto the surface to be measured via the two soot blowing nozzles 2 for soot blowing operation. As Figure 3 shown, at the position where the soot blowing operation is simultaneously performed on the surface to be measured, it is also reflected into the camera 4 through the reflecting surface 3.1 of the soot blowing nozzle 2 to collect images in real time.

[0034] On the side of the reflective flow guide block 3 facing the camera, there are two reflecting surfaces 3.1, and the included angle between the two reflecting surfaces 3.1 is about 90°.

[0035] The reflective flow guide block 3 is made of materials such as stainless steel, and the reflecting surface 3.1 is made smooth and flat through processes such as mechanical polishing and chemical polishing to achieve the effect of specular reflection.

[0036] The reflective flow guide block 3 can not only reflect the ash accumulation condition on the heating surface onto the camera, but also play a role in guiding the flow, reducing the flow pressure loss, and increasing the rigidity of the soot blowing jet. Moreover, the camera 4 installed on the central axis of the soot blowing barrel 1, combined with the reflective flow guide block 3, forms an optical path reflection system, which can capture the image of the ash accumulation on the heating surface through the soot blowing nozzle 2 and using the reflecting surface of the reflective flow guide block 3 by the camera 4.

[0037] The implementation method of the present invention adopts a visual soot blower using compressed air as the soot blowing medium, and its principle and detection method are as follows:

[0038] In specific implementation, the visual soot blower is inserted into the boiler. The two soot blowing nozzles 2 of the visual soot blower are aligned with the symmetric two sides of the inner wall of the boiler, and the inner wall of the boiler is soot blown by the visual soot blower.

[0039] As Figure 2 shown, the soot blowing medium of compressed air enters from one end of the soot blowing barrel 1 and is ejected from the two soot blowing nozzles 2 at the other end to form a high-speed soot blowing jet. The soot blowing jet shoots towards the surface to be measured for soot blowing operation; the high-speed soot blowing jet is reflected by the reflecting surface 3.1 and guided into the two soot blowing nozzles 2, thereby accelerating the speed of the soot blowing jet. As Figure 3 shown, at the same time, since a camera and a reflective flow guiding block are arranged on the axis of the soot blowing barrel, the ash accumulation image of the surface to be heated is reflected to the camera 4 through the soot blowing nozzle 2 and then by the reflecting surface 3.1 of the reflective flow guiding block 3, realizing the visualization of the real-time soot blowing operation.

[0040] Since the camera, the camera signal line and the reflective flow guiding block are all inside the soot blowing barrel and are cooled and protected by the relatively low-temperature compressed air flow, the working conditions are good.

[0041] When not soot blowing, since the soot blowing barrel withdraws from the furnace, the above-mentioned visual device will not be damaged. At the same time, the reflective flow guiding block has a flow guiding function, reducing the pressure loss of the soot blowing jet and increasing the jet rigidity, improving the soot blowing effect.

[0042] In a further specific implementation, the visual soot blower moves axially along the inner wall of the boiler and rotates circumferentially along the inner wall of the boiler while soot blowing, so as to quickly and real-timely visualize and controllably perform the soot blowing operation on the inner wall of the boiler.

[0043] In specific implementation, the method uses compressed air as the soot blowing medium, with a pressure of 0.7 - 1.2 MPa and a temperature of normal temperature 20 - 30 °C.

Claims

1. A visual soot blower using compressed air as the soot blowing medium, characterized in that: It includes a soot blowing barrel (1), a soot blowing nozzle (2), a reflective deflector (3) and a camera (4). The end of the soot blowing barrel (1) is closed, and soot blowing nozzles (2) are symmetrically arranged on both sides of the side wall near the end. Inside the soot blowing barrel (1) between the two soot blowing nozzles (2), a reflective deflector (3) with two reflective surfaces (3.1) is fixedly arranged. A camera (4) is arranged on the central axis of the soot blowing barrel (1), and the camera (4) faces the end of the soot blowing barrel (1) along the central axis of the soot blowing barrel (1).

2. The visual soot blower using compressed air as the soot blowing medium according to claim 1, characterized in that, The two reflective surfaces (3.1) of the reflective deflector (3) are arranged perpendicular to each other at 90 degrees.

3. The visual soot blower using compressed air as the soot blowing medium according to claim 1, characterized in that, One part of each of the two reflective surfaces (3.1) of the reflective deflector (3) faces the two soot blowing nozzles (2) respectively, and the other part faces the camera (4).

4. The visual soot blower using compressed air as the soot blowing medium according to claim 3, characterized in that, Each reflective surface (3.1) of the reflective deflector (3) forms an angle of 45 degrees with the axis of the soot blowing nozzle (2) and the orientation of the camera (4) respectively.

5. The visual soot blower using compressed air as the soot blowing medium according to claim 1, characterized in that, The camera (4) is connected to an external controller via a camera signal line (4.1).

6. The visual soot blower using compressed air as the soot blowing medium according to claim 1, characterized in that, Compressed air enters from the end of the soot blowing barrel (1) opposite to the end, is reflected by the reflective surface (3.1) and diverted into the two soot blowing nozzles (2), and is blown onto the surface to be measured through the two soot blowing nozzles (2) for soot blowing operation.

7. A visual soot blowing method using compressed air as the soot blowing medium for the visual soot blower according to claim 1, characterized in that the method is as follows: The soot blowing medium enters from one end of the soot blowing barrel (1) and is ejected from the two soot blowing nozzles (2) at the other end to form a soot blowing jet. The soot blowing jet is blown onto the surface to be measured for soot blowing operation; the soot blowing jet is reflected by the reflective surface (3.1) and diverted into the two soot blowing nozzles (2), thereby accelerating the speed of the soot blowing jet. At the same time, the image of the accumulated ash on the surface to be measured passes through the soot blowing nozzle (2) and is then reflected to the camera (4) by the reflective surface (3.1) of the reflective deflector (3), realizing the visualization of the real-time soot blowing operation.

8. The visual soot blowing method using compressed air as the soot blowing medium according to claim 7, characterized in that the method uses compressed air as the soot blowing medium, with a pressure of 0.7 - 1.2 MPa and a normal temperature.

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