Boiler coal combustion image flame detection equipment

Abstract

The utility model discloses boiler coal combustion image flame detection equipment which comprises a flame detection probe, a cooling air inlet end of the flame detection probe is provided with a three-way connector, one end, far away from the flame detection probe, of the three-way connector is connected with a cooling air supply pipeline, and the other end, far away from the flame detection probe, of the three-way connector is provided with a rotary air guide mechanism. A gas-guide tube capable of rotating around the axis of the lens end of the flame detection probe is arranged on the rotary gas-guide mechanism, and the gas-guide tube is communicated with the three-way joint through the rotary gas-guide mechanism. According to the utility model, one part of cooling air for cooling the flame detection probe is divided and supplied into the rotary air guide mechanism, one part of the cooling air can be accurately sprayed to the ash deposition position at the lens end of the flame detection probe through the telescopic nozzle by virtue of the rotation of the telescopic nozzle and the air guide pipe, and the deposited ash is scoured by high-speed air so as to fall off; therefore, the lens end of the flame detection probe can be maintained without dismounting the flame detection probe, and the maintenance efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of flame detectors, in particular to a boiler coal combustion image fire detection device. Background Technique

[0002] The statements herein only provide the background technique related to the present invention and do not necessarily constitute the prior art.

[0003] The stability of boiler combustion is crucial for safe and economic operation. With the increase in single-unit capacity and the complexity of equipment, boiler operation faces more challenges, such as coal type changes and load adjustments. During the start-up and shutdown processes, operational errors may lead to unstable combustion, even furnace flameout and furnace explosion. Therefore, power station boilers need to be equipped with a complete and reliable furnace safety monitoring system, and the reliability of the flame detector is of great importance.

[0004] Since the flame detector probe works in a furnace with high temperature and large amount of fly ash, in order to withstand the high-temperature radiation of the furnace and the erosion of fly ash in the furnace and avoid mirror fouling, the current flame detector is equipped with a cooling air system. By inputting cooling air into the probe and making the cooling air spray out at the lens, the purpose of cooling the lens and blocking fly ash is achieved. However, in the actual use process, due to the problem of the stability of the cooling air supply, mirror fouling is difficult to avoid, and the wind force of the cooling air is difficult to blow the fouling on the mirror away. In order to avoid affecting the judgment of the subsequent fire detection signal, the fire detection probe can only be removed for maintenance, and the maintenance efficiency is low. Summary of the Utility Model

[0005] The purpose of the utility model is to aim at the above deficiencies at present and provide a boiler coal combustion image fire detection device to achieve the purpose of improving the maintenance efficiency.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions: A boiler coal combustion image fire detection device includes a fire detection probe. A tee joint is arranged at the cooling air inlet end of the fire detection probe. One end of the tee joint far from the fire detection probe is connected to the cooling air supply pipeline. The other end of the tee joint far from the fire detection probe is provided with a rotary air guiding mechanism. A gas guiding pipe capable of rotating around the axis of the lens end of the fire detection probe is arranged on the rotary air guiding mechanism. The gas guiding pipe is communicated with the tee joint through the rotary air guiding mechanism. One end of the gas guiding pipe far from the rotary air guiding mechanism is provided with a telescopic nozzle for jetting air towards the lens end of the fire detection probe and the jetting height is variable.

[0007] Further, the rotary air guiding mechanism includes a valve connected to the tee joint and a pneumatic rotary joint sleeved on the fire detection probe. A communication pipe is arranged between the air inlet end of the pneumatic rotary joint and one end of the valve far from the tee joint. The air outlet end of the pneumatic rotary joint is connected to one end of the gas guiding pipe.

[0008] Furthermore, the telescopic nozzle comprises a hollow telescopic tube disposed at one end of the air guide tube away from the rotary air guide mechanism and perpendicular to the air guide tube, the end of the hollow telescopic tube away from the air guide tube is provided with a nozzle, the nozzle air outlet end is located on the side of the nozzle close to the lens end of the fire detection probe, and the cross-sectional area of ​​the side of the nozzle close to the lens end of the fire detection probe is smaller than the cross-sectional area of ​​the side of the nozzle away from the lens end of the fire detection probe;

[0009] The telescopic nozzle also includes a telescopic control component for controlling the telescopic length of the hollow telescopic tube, the telescopic control component includes two side plates arranged on the rotating air guide mechanism and capable of rotating along with the air guide tube, a fixed plate is fixedly connected between the two side plates, a movable plate is slidably arranged between the two side plates, the movable plate is located between the fixed plate and the rotating air guide mechanism, an adjusting screw is threadedly connected to the fixed plate, which passes through the fixed plate and has one end rotatably connected to the movable plate, and a pull rope is connected between the movable plate and the nozzle.

[0010] Furthermore, the fire detection probe is provided with an annular bracket for supporting the air duct, the air duct is fixedly connected to the annular bracket, and the annular bracket and the pneumatic rotary joint can rotate around the axis of the lens end of the fire detection probe and reciprocate along the axis of the lens end of the fire detection probe.

[0011] Furthermore, two limit blocks for limiting the moving distance of the annular bracket are provided on the fire detection probe, and the annular bracket is located between the two limit blocks. When the annular bracket contacts the limit block away from the rotating air guide mechanism, the telescopic nozzle is located outside the fire detection probe. When the annular bracket contacts the limit block close to the rotating air guide mechanism, the telescopic nozzle is inserted into the fire detection probe and does not contact the lens end of the fire detection probe. A T-shaped handle is provided at the control end of the valve. When the T-shaped handle contacts the pneumatic rotary joint, the annular bracket contacts the limit block away from the rotating air guide mechanism and the valve is in a closed state.

[0012] The beneficial effects of the utility model are embodied in:

[0013] The utility model separates a part of the cooling air supplied to cool the fire detection probe and supplies it into a rotary air guide mechanism, and the telescopic nozzle and the air guide pipe rotate, so that a part of the cooling air can be accurately sprayed to the dust accumulation at the lens end of the fire detection probe through the telescopic nozzle, and the dust is flushed away by high-speed wind, so that the lens end of the fire detection probe can be maintained without removing the fire detection probe, thereby improving maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional view of the utility model;

[0015] Figure 2 for Figure 1 A local enlarged schematic diagram of point A shown;

[0016] Figure 3 is a partial view of the present utility model;

[0017] Figure 4 is a three-dimensional view of the telescopic control assembly of the present utility model.

[0018] In the figure:

[0019] 1. Flame detector probe; 2. Three-way joint; 3. Rotary air guiding mechanism; 31. Valve; 32. Pneumatic rotary joint; 33. Connecting pipe; 4. Air guiding pipe; 5. Telescopic nozzle; 51. Hollow telescopic pipe; 52. Nozzle; 53. Side plate; 54. Fixed plate; 55. Movable plate; 56. Adjusting screw; 57. Pulling rope; 6. Ring-shaped bracket; 7. Limit block. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0021] Please refer to Figures 1-4 , the present utility model discloses a boiler coal combustion image flame detection device, including a flame detector probe 1. A three-way joint 2 is provided at the cooling air inlet end of the flame detector probe 1. One end of the three-way joint 2 far from the flame detector probe 1 is connected to the cooling air supply pipeline, and a rotary air guiding mechanism 3 is provided at the other end of the three-way joint 2 far from the flame detector probe 1. An air guiding pipe 4 capable of rotating around the axis of the lens end of the flame detector probe 1 is provided on the rotary air guiding mechanism 3. The air guiding pipe 4 is communicated with the three-way joint 2 through the rotary air guiding mechanism 3, and a telescopic nozzle 5 for jetting air towards the lens end of the flame detector probe 1 and with variable jetting height is provided at the end of the air guiding pipe 4 far from the rotary air guiding mechanism 3.

[0022] In the present utility model, a part of the cooling air supplied to cool the flame detector probe 1 is diverted into the rotary air guiding mechanism 3. Through the rotation of the telescopic nozzle 5 and the air guiding pipe 4, a part of the cooling air can be accurately jetted towards the ash accumulation at the lens end of the flame detector probe 1. The ash accumulation is washed off by the high-speed air, so that the maintenance of the lens end of the flame detector probe 1 can be completed without removing the flame detector probe 1, improving the maintenance efficiency.

[0023] In one embodiment, the rotary air guiding mechanism 3 includes a valve 31 connected to the three-way joint 2 and a pneumatic rotary joint 32 sleeved on the flame detector probe 1. A connecting pipe 33 is provided between the air inlet end of the pneumatic rotary joint 32 and the end of the valve 31 away from the three-way joint 2. The air outlet end of the pneumatic rotary joint 32 is connected to one end of the air guiding pipe 4.

[0024] With this design, the air guiding pipe 4 can drive the telescopic nozzle 5 to rotate around the lens end of the flame detector probe 1, which not only increases the cleanable area of the telescopic nozzle 5, but also does not affect the cooling air entering the air guiding pipe 4 through the rotary air guiding mechanism 3 when the air guiding pipe 4 rotates.

[0025] It should be noted that both the flame detector probe 1 and the pneumatic rotary joint 32 are mature existing technologies and will not be elaborated here.

[0026] In one embodiment, the telescopic nozzle 5 includes a hollow telescopic pipe 51 disposed at the end of the air guiding pipe 4 away from the rotary air guiding mechanism 3 and perpendicular to the air guiding pipe 4. A nozzle 52 is provided at the end of the hollow telescopic pipe 51 away from the air guiding pipe 4. The air outlet end of the nozzle 52 is located on the side of the nozzle 52 close to the lens end of the flame detector probe 1, and the cross-sectional area of the side of the nozzle 52 close to the lens end of the flame detector probe 1 is smaller than the cross-sectional area of the side of the nozzle 52 away from the lens end of the flame detector probe 1;

[0027] The telescopic nozzle 5 further includes a telescopic control component for controlling the telescopic length of the hollow telescopic pipe 51. The telescopic control component includes two side plates 53 disposed on the rotary air guiding mechanism 3 and capable of rotating together with the air guiding pipe 4. A fixing plate 54 is fixedly connected between the two side plates 53. A movable plate 55 is slidably disposed between the two side plates 53. The movable plate 55 is located between the fixing plate 54 and the rotary air guiding mechanism 3. An adjusting screw 56 is threadedly connected to the fixing plate 54 and penetrates through the fixing plate 54 with one end rotatably connected to the movable plate 55. A pulling rope 57 is connected between the movable plate 55 and the nozzle 52. The pulling rope 57 is preferably a steel wire rope.

[0028] With this design, by rotating the adjusting screw 56, the adjusting screw 56 pushes the movable plate 55 to move towards the side close to the rotary air guiding mechanism 3, releasing the pulling rope 57. Thus, when air is supplied in the air guiding pipe 4, the air pressure can be used to push the hollow telescopic pipe 51 to extend. Therefore, by adjusting the position of the movable plate 55, the spraying point of the nozzle 52 can be changed. Since the cross-sectional area of the side of the nozzle 52 close to the lens end of the flame detector probe 1 is smaller than the cross-sectional area of the side away from the lens end of the flame detector probe 1, the spraying air pressure increases, which can improve the scouring efficiency of the ash accumulation.

[0029] During specific operation, pulleys for guiding the direction of the pulling rope 57 can be provided on the air guiding pipe 4 to improve the smoothness of the pulling rope 57 pulling the nozzle 52. A scale can be provided on the side plate 53 to assist maintenance personnel in determining the adjustment position.

[0030] In one embodiment, an annular bracket 6 for supporting the air guide pipe 4 is sleeved on the flame detector probe 1. The air guide pipe 4 is fixedly connected to the annular bracket 6. Both the annular bracket 6 and the pneumatic rotary joint 32 can rotate around the axis of the lens end of the flame detector probe 1 and reciprocate along the axis direction of the lens end of the flame detector probe 1.

[0031] With such a design, the nozzle 52 can be as close as possible to the lens end when flushing the ash deposits, reducing the influence of the original cooling air on the flushing air. After the flushing is completed, the nozzle 52 can be moved out of the flame detector probe 1 to avoid affecting the normal monitoring of the flame detector probe 1.

[0032] It should be noted that the connecting pipe 33 is a flexible pipe, and the movement of the pneumatic rotary joint 32 is not restricted by the connecting pipe 33.

[0033] In one embodiment, two limit blocks 7 for restricting the moving distance of the annular bracket 6 are arranged on the flame detector probe 1. The annular bracket 6 is located between the two limit blocks 7. When the annular bracket 6 contacts the limit block 7 far from the rotary air guiding mechanism 3, the telescopic nozzle 5 is located outside the flame detector probe 1. When the annular bracket 6 contacts the limit block 7 close to the rotary air guiding mechanism 3, the telescopic nozzle 5 is inserted into the flame detector probe 1 and does not contact the lens end of the flame detector probe 1. A T-shaped handle is arranged at the control end of the valve 31. When the T-shaped handle contacts the pneumatic rotary joint 32, the annular bracket 6 contacts the limit block 7 far from the rotary air guiding mechanism 3 and the valve 31 is in a closed state.

[0034] With such a design, the movement position of the nozzle 52 is restricted by the limit blocks 7, which is convenient for maintenance personnel to control the nozzle 52 to approach the lens end during maintenance. At the same time, it is also convenient to reset the nozzle 52 after the maintenance is completed. By setting the T-shaped handle and using the T-shaped handle to push against the rotary air guiding mechanism 3, the nozzle 52 cannot move in the non-maintenance state, ensuring the working stability of the flame detector probe 1. In the maintenance state, only by opening the valve 31 can the nozzle 52 be unlocked synchronously, and the operation is convenient and fast.

[0035] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0037] In addition, "a plurality of" means two or more.

[0038] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the scope of protection of the present utility model.

Claims

1. A boiler coal combustion image fire detection device, comprising a fire detection probe (1), characterized in that: A three-way joint (2) is provided at the cooling air inlet end of the fire detection probe (1); one end of the three-way joint (2) away from the fire detection probe (1) is connected to a cooling air supply pipeline; the other end of the three-way joint (2) away from the fire detection probe (1) is provided with a rotary air guide mechanism (3); the rotary air guide mechanism (3) is provided with an air guide pipe (4) that can rotate around the axis of the lens end of the fire detection probe (1); the air guide pipe (4) is connected to the three-way joint (2) through the rotary air guide mechanism (3); the end of the air guide pipe (4) away from the rotary air guide mechanism (3) is provided with a telescopic nozzle (5) for spraying air to the lens end of the fire detection probe (1) and the spraying height is variable.

2. According to claim 1, a boiler coal combustion image fire detection device is characterized in that: The rotary air guide mechanism (3) comprises a valve (31) connected to the three-way joint (2) and a pneumatic rotary joint (32) sleeved on the fire detection probe (1); a connecting pipe (33) is provided between the air inlet end of the pneumatic rotary joint (32) and an end of the valve (31) away from the three-way joint (2); and the air outlet end of the pneumatic rotary joint (32) is connected to one end of the air guide pipe (4).

3. The boiler coal combustion image fire detection device according to claim 1, characterized in that: The telescopic nozzle (5) comprises a hollow telescopic tube (51) which is arranged at one end of the air guide tube (4) away from the rotary air guide mechanism (3) and is perpendicular to the air guide tube (4); a nozzle (52) is arranged at one end of the hollow telescopic tube (51) away from the air guide tube (4); an air outlet end of the nozzle (52) is located on a side of the nozzle (52) close to the lens end of the fire detection probe (1); and a cross-sectional area of ​​the side of the nozzle (52) close to the lens end of the fire detection probe (1) is smaller than a cross-sectional area of ​​the side of the nozzle (52) away from the lens end of the fire detection probe (1); The telescopic nozzle (5) further comprises a telescopic control assembly for controlling the telescopic length of the hollow telescopic tube (51), the telescopic control assembly comprising two side plates (53) arranged on the rotary air guide mechanism (3) and capable of rotating together with the air guide tube (4), a fixed plate (54) being fixedly connected between the two side plates (53), a movable plate (55) being slidably arranged between the two side plates (53), the movable plate (55) being located between the fixed plate (54) and the rotary air guide mechanism (3), an adjusting screw (56) penetrating the fixed plate (54) and having one end rotatably connected to the movable plate (55) being threadedly connected to the fixed plate (54), and a pull rope (57) being connected between the movable plate (55) and the nozzle (52).

4. The boiler coal combustion image fire detection device according to claim 2, characterized in that: The fire detection probe (1) is sleeved with an annular bracket (6) for supporting the air guide tube (4); the air guide tube (4) is fixedly connected to the annular bracket (6); and the annular bracket (6) and the pneumatic rotary joint (32) can both rotate around the axis of the lens end of the fire detection probe (1) and reciprocate along the axis of the lens end of the fire detection probe (1).

5. The boiler coal combustion image fire detection device according to claim 4, characterized in that: The fire detection probe (1) is provided with two limit blocks (7) for limiting the moving distance of the annular bracket (6); the annular bracket (6) is located between the two limit blocks (7); when the annular bracket (6) contacts the limit block (7) away from the rotary air guide mechanism (3), the telescopic nozzle (5) is located outside the fire detection probe (1); when the annular bracket (6) contacts the limit block (7) close to the rotary air guide mechanism (3), the telescopic nozzle (5) is plugged into the fire detection probe (1) and does not contact the lens end of the fire detection probe (1); the control end of the valve (31) is provided with a T-shaped handle; when the T-shaped handle contacts the pneumatic rotary joint (32), the annular bracket (6) contacts the limit block (7) away from the rotary air guide mechanism (3) and the valve (31) is in a closed state.

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