CN214468764U - Flame detection assembly and boiler flame detection system - Google Patents

Abstract

The utility model provides a flame detection subassembly and boiler flame detecting system relates to the technical field that the boiler detected. A flame detection assembly comprising: an outer catheter, an inner catheter and an optical fiber; the inner guide pipe penetrates through the outer guide pipe, and a first air channel is formed between the inner guide pipe and the outer guide pipe; the optical fiber penetrates through the inner guide pipe, a second ventilation channel is formed between the optical fiber and the inner guide pipe, a ventilation groove is formed in the first end of the inner guide pipe, a ventilation hole is formed in the second end of the inner guide pipe, and the ventilation groove and the ventilation hole are communicated with the two ends of the second ventilation channel respectively. A boiler flame detection system includes a flame detection assembly. The problems that the optical fiber is easy to damage and the like of a detection system in the prior art are solved.

Description

Flame detection assembly and boiler flame detection system

Technical Field

The utility model belongs to the technical field of the technique that the boiler detected and specifically relates to a flame detecting component and boiler flame detecting system are related to.

Background

Since the flame detection system of a boiler of a 2 x 300MW unit is put into operation, faults that the flame cannot be detected due to frequent optical fiber burnout are caused, serious threats are caused to the safe and stable operation of the unit, and the problems of large field maintenance workload, high equipment maintenance cost and the like are brought.

In the prior art, a burner flame detector and a cooling air system are composed of an integrated flame detection probe, a flame detection power supply cabinet, a maintenance workstation, an optical fiber and related communication equipment materials, a cooling air pipe, a connector and the like. The front end of the outer duct component is welded on a partition plate of the secondary air box through a cushion block, the observation angle and the observation range of flame detection are determined by the cushion block, the installation position of the front end of the outer duct component can directly influence the detection result of flame detection equipment on the working condition of a hearth, and the distance from the foremost end of the duct to the secondary air duct opening is 3-5 cm. The flame detection guide pipe can transmit flame signals in the hearth to a flame detection probe outside the boiler through optical fibers, and the flame detection guide pipe is used as an important component of a boiler FSSS system, and the flame detection system plays an important role in ensuring safe and stable operation of the boiler.

In order to obtain a better detection result and avoid the influence of a burner baffle on the flame detection installation position, most flame detection sleeves are made into a flexible structure. The flame detection cooling air passes through the inner sleeve and the outer sleeve of the flame detector to indirectly cool the flame detection optical fiber. The problems of optical fiber degumming, burning or optical fiber light transmittance reduction and the like are easily caused when the cooling effect is poor due to the influence of a large amount of radiant heat generated during the combustion of boiler fuel and the optical fiber fixing part on the optical fiber conduction heat, and adverse factors such as poor combustion working condition of the boiler, too close combustion ignition point to a hearth, frequent positive pressure combustion and the like; moreover, when the optical fiber has a problem and needs to be replaced, the flame detection inner sleeve needs to be pulled out, so that the optical fiber is difficult to pull out and plug, the maintenance workload is large, and the cost is high.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a flame detection subassembly and boiler flame detecting system to alleviate the detecting system among the prior art and appear optic fibre easily and damage the scheduling problem.

In order to solve the technical problem, the utility model discloses the technical means who takes does:

the utility model provides a pair of flame detection subassembly, include: an outer catheter, an inner catheter and an optical fiber;

the inner guide pipe penetrates through the outer guide pipe, and a first air channel is formed between the inner guide pipe and the outer guide pipe;

the optical fiber penetrates through the inner guide pipe, a second ventilation channel is formed between the optical fiber and the inner guide pipe, a ventilation groove is formed in the first end of the inner guide pipe, a ventilation hole is formed in the second end of the inner guide pipe, and the ventilation groove and the ventilation hole are communicated with the two ends of the second ventilation channel respectively.

As a further technical scheme, the first air channel and the second air channel are communicated with an external cold air supply device.

As a further technical scheme, the cold air supply device comprises a cold air pipeline, a joint and an air pump;

the joint is connected between the cold air pipeline and the outer guide pipe, and the first ventilation channel and the second ventilation channel are communicated with the cold air pipeline through the joint;

one end of the cold air pipeline, which is far away from the joint, is connected with the air pump.

As a further technical solution, the flame detection assembly further comprises a detection probe;

the joint is a three-way joint and comprises a first port connected with the outer conduit, a second port connected with the detection probe and a third port connected with the cold air pipeline;

and the optical fiber sequentially penetrates through the first port and the second port and then is connected with the detection probe.

As a further technical solution, the three-way joint includes a first pipe and a second pipe;

the first port and the second port are respectively disposed at both ends of the first pipe;

the second pipe is connected to the middle part of the first pipe, and the second pipe is relative to the extending direction of the first pipe and an included angle between the flowing directions of cold air in the first pipe is an obtuse angle.

As a further technical solution, the flame detection assembly further comprises a flange joint;

one end of the flange joint is connected with the second port, and the other end of the flange joint is connected with the detection probe;

the optical fiber sequentially penetrates through the first port, the second port and the flange joint and then is connected with the detection probe.

As a further technical solution, one end of the detection probe, which is far away from the optical fiber, is connected with a cable;

and/or, a ball valve is arranged on the cold air pipeline.

As a further technical solution, the flame detection assembly further includes a quartz lens, and the quartz lens is disposed at a front end of the optical fiber.

As a further aspect, the flame detection assembly further includes a mount;

the mounting member is coupled to the outer conduit to secure the flame detection assembly to a wall of a boiler.

The utility model provides a pair of boiler flame detecting system, including above-mentioned flame detection subassembly.

Compared with the prior art, the utility model provides a flame detection subassembly and boiler flame detecting system have the technical advantage to be:

the utility model provides a pair of flame detection subassembly, including outer pipe, inner conduit and optic fibre, wherein, in the outer pipe was worn to locate by the inner conduit, and was formed with first ventiduct between inner conduit and the outer pipe, in the inner conduit was worn to locate by optic fibre, was formed with the second ventiduct between optic fibre and the inner conduit to, including the first end of pipe seted up the ventilation groove, the ventilation hole has been seted up to the second end, and ventilation groove and ventilation hole correspond the intercommunication with the both ends of second ventiduct respectively. Based on above-mentioned setting for cold wind can flow to the front end of optic fibre through first ventiduct, and blow off from the front end of optic fibre, in order to play certain cooling effect to the optic fibre, this cooling effect belongs to indirect cooling, and cold wind can also get into the second ventiduct and flow to the front end of optic fibre from air channel or ventilation hole, finally blows off from ventilation hole or the air channel of optic fibre front end, in order to play certain cooling effect to the optic fibre, this cooling effect belongs to direct cooling. Through the arrangement of the first ventilation channel and the second ventilation channel, a single-layer cooling mode in the prior art is changed, a double-layer cooling mode is adopted, the cooling effect on the optical fiber is greatly improved, the temperature of the front end of the optical fiber is reduced, and the service life of the optical fiber is ensured.

The utility model also provides a boiler flame detecting system, including above-mentioned flame detecting component, so, technical advantage and effect that this boiler flame detecting system reached include the technical advantage and the effect that above-mentioned flame detecting component reached, and here is no longer repeated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a disassembled schematic view of a partial structure of a boiler flame detection system according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a flame detection assembly according to an embodiment of the present invention.

Icon:

100-an outer catheter;

200-an inner conduit; 210-a ventilation slot; 220-a vent;

300-an optical fiber;

400-detecting the probe;

510-a cold air duct; 520-a three-way joint; 521-a first tube; 5211-a first port; 5212-a second port; 522-a second tube; 5221-third port; 530-ball valve;

600-flange joint;

700-a cable;

800-a mounting member;

p-a first air duct; q-a second ventilation channel.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present invention will be described in further detail below with reference to specific embodiments and with reference to the accompanying drawings.

The specific structure is shown in fig. 1-2.

The flame detection assembly provided by the embodiment comprises an outer guide pipe 100, an inner guide pipe 200 and an optical fiber 300, wherein the inner guide pipe 200 is arranged in the outer guide pipe 100 in a penetrating manner, a first ventilation channel P is formed between the inner guide pipe 200 and the outer guide pipe 100, the optical fiber 300 is arranged in the inner guide pipe 200 in a penetrating manner, a second ventilation channel Q is formed between the optical fiber 300 and the inner guide pipe 200, a ventilation groove 210 is formed at the first end of the inner guide pipe 200, a ventilation hole 220 is formed at the second end, and the ventilation groove 210 and the ventilation hole 220 are respectively communicated with two ends of the second ventilation channel Q correspondingly.

Based on the above arrangement, the cool air can flow to the front end of the optical fiber 300 through the first ventilation channel P and blow out from the front end of the optical fiber 300, so as to have a certain cooling effect on the optical fiber 300, the cooling effect belongs to indirect cooling, and the cool air can also enter the second ventilation channel Q from the ventilation slot 210 or the ventilation slot 220 and flow to the front end of the optical fiber 300, and finally blow out from the ventilation slot 220 or the ventilation slot 210 at the front end of the optical fiber 300, so as to have a certain cooling effect on the optical fiber 300, and the cooling effect belongs to direct cooling.

Through the arrangement of the first ventilation channel P and the second ventilation channel Q, a single-layer cooling mode in the prior art is changed, but a double-layer cooling mode is adopted, so that the cooling effect on the optical fiber 300 is greatly improved, the temperature of the front end of the optical fiber 300 is reduced, and the service life of the optical fiber 300 is ensured.

As a more preferable embodiment, in this embodiment, a cold air supply device is additionally provided, which is respectively communicated with the first air passage P and the second air passage Q, and cold air can be simultaneously supplied to the first air passage P and the second air passage Q through the cold air supply device, so that cold air is supplied to the front end of the optical fiber 300 through the first air passage P and the second air passage Q, thereby cooling the front end of the optical fiber 300.

Specifically, the confession cold wind device includes the cold air pipeline, joint and air pump, the end of giving vent to anger of air pump is connected with the one end of cold air pipeline, the other end on cold air pipeline is connected with outer pipe 100 through the joint, and, first ventiduct P and second ventiduct Q all communicate with cold air duct 510 through the joint, so, after starting the air pump, cold wind flows to first ventiduct P and second ventiduct Q along cold air duct 510, finally carries the front end of optic fibre 300, and blow out from the front end, in order to play the cooling effect to the front end of optic fibre 300.

It should be noted here that one end of the first air passage P is provided with an inlet, the other end is provided with an outlet, similarly, one end of the second air passage Q is communicated with the air groove 210, and the other end is communicated with the air hole 220, so that the cool air flowing into the outer duct 100 from the cool air passage enters through the inlet of the first air passage P and the air groove 210 of the second air passage Q, and finally blows out from the outlet of the first air passage P and the air hole 220 of the second air passage Q.

Preferably, the vent holes 220 are provided in plurality and arranged around the front end of the optical fiber 300 to enlarge an area for cooling the optical fiber 300, thereby enhancing cooling efficiency.

As a more preferable embodiment, the flame detection assembly further includes a detection probe 400, the detection probe 400 needs to be connected to the end of the optical fiber 300, and considering the arrangement of the optical fiber 300 and the arrangement of the air duct inside the flame detection assembly, in this embodiment, a three-way joint 520 is preferably adopted, the three-way joint 520 includes a first pipe 521 and a second pipe 522 that are communicated with each other, the first pipe 521 and the second pipe 522 are disposed at an included angle, two ends of the first pipe 521 are respectively a first port 5211 and a second port 5212, an outlet of the second pipe 522 is a third port 5221, the first port 5211 is connected to the outer conduit 100, the second port 5212 is connected to the detection probe 400, and the third port 5221 is connected to the cold air duct 510. In this way, the optical fiber 300 passes through the first pipe 521 and then is connected to the sensing probe 400 to transmit flame information to the sensing probe 400, and the cold air duct 510 inputs cold air into the first ventilation duct and the second ventilation duct through the second pipe 522 to cool the front end of the optical fiber 300.

Further, an included angle between the extending direction of the second pipe 522 and the flowing direction of the cold air in the first pipe 521 is an obtuse angle, that is, one end of the second pipe 522, which is away from the first pipe 521, is staggered backwards at the joint of the second pipe 522 and the first pipe 521 along the flowing direction of the cold air, so that when the cold air in the cold air duct 510 enters the first pipe 521 along the second pipe 522, a velocity component is provided in advance, so that the cold air flows more smoothly in the first pipe 521.

Of course, in other embodiments, the second pipe 522 and the first pipe 521 may also be perpendicular to each other, and there is no limitation to the specific arrangement of the two.

In order to ensure the stability and the firmness of the connection between the three-way joint 520 and the detection probe 400, the flange joint 600 is additionally arranged between the three-way joint 520 and the detection probe 400 in the embodiment, one end of the flange joint 600 is connected with the second port 5212, and the other end of the flange joint 600 is connected with the detection probe 400, so that the connection between the first pipe 521 in the three-way joint 520 and the detection probe 400 is realized through the flange joint 600, and the stability and the firmness of the connection are improved.

Further, in this embodiment, the cable 700 is further connected to the detection probe 400, and the flame signal on the detection probe 400 can be transmitted to the outside of the furnace for analysis through the cable 700, and in addition, the cable 700 also has a function of supplying power to the detection probe 400, so as to ensure that the detection probe 400 normally detects flame information.

In consideration of the control factor of cold air delivery, in this embodiment, the ball valve 530 is additionally disposed on the cold air duct 510, and the cold air duct 510 can be opened or closed through the ball valve 530, and certainly, the flow rate of cold air in the cold air duct 510 can also be adjusted.

The quartz lens has been set up at the front end of optic fibre 300 in this embodiment, under the general condition, the quartz lens tolerates the temperature and is 1200 ℃, and optic fibre 300 normally tolerates the temperature and only is 450 ℃, thereby, optic fibre 300 behind the quartz lens is burnt and damaged easily, lead to the detected signal of furnace flame unstable, frequently flicker, thereby, in this embodiment through set up the radiating efficiency to optic fibre 300 front end in flame detection subassembly, guaranteed that optic fibre 300 front end is difficult by the burning and damage, and then guaranteed flame detection subassembly and boiler flame detection system's normal use.

As a more preferable embodiment, an attachment 800, preferably an attachment pipe, is provided outside the outer guide pipe 100, and the attachment 800 is fixed to the wall of the boiler, so that the flame detection unit can be fixed in the boiler, and the flame detection unit is ensured to be less likely to fall off.

This embodiment still provides a boiler flame detecting system, includes above-mentioned flame detecting component, so, the technical advantage and the effect that this boiler flame detecting system reached include the technical advantage and the effect that above-mentioned flame detecting component reached, and it is no longer repeated here.

In conclusion, the double-layer ventilation channel is arranged in the flame detection assembly, so that the front end of the optical fiber 300 is cooled in a multi-azimuth and comprehensive mode, double cooling effects are achieved, the heat dissipation efficiency of the front end of the optical fiber 300 is greatly improved, the service life of the optical fiber 300 is prolonged, the operation cost is reduced, and the second ventilation channel Q is formed between the light and the inner guide pipe 200, so that the optical fiber 300 is more convenient to install and maintain, and the workload of field maintenance is reduced; in addition, the cooling effect is achieved on the quartz lens to a certain extent, the temperature resistance level of the quartz lens is improved, the temperature resistance of the quartz lens is improved to 1200 ℃, and the coking degree of the quartz lens is reduced. Therefore, the stable and safe operation of the boiler flame detection system is ensured.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A flame detection assembly, comprising: an outer catheter (100), an inner catheter (200), and an optical fiber (300);

the inner conduit (200) is arranged in the outer conduit (100) in a penetrating way, and a first ventilation channel (P) is formed between the inner conduit (200) and the outer conduit (100);

optical fiber (300) wear to locate in inner catheter (200), optical fiber (300) with be formed with second ventilation way (Q) between inner catheter (200), ventilation groove (210) have been seted up to the first end of inner catheter (200), and ventilation hole (220) have been seted up to the second end, just ventilation groove (210) reach ventilation hole (220) respectively with the both ends intercommunication in second ventilation way (Q).

2. Flame detection assembly according to claim 1, wherein the first ventilation duct (P) and the second ventilation duct (Q) are both in communication with an external cold air supply device.

3. The flame detection assembly of claim 2, wherein the cold air supply device includes a cold air duct (510), a fitting, and an air pump;

the joint is connected between the cold air pipeline (510) and the outer guide pipe (100), and the first ventilation channel (P) and the second ventilation channel (Q) are communicated with the cold air pipeline (510) through the joint;

one end of the cold air pipeline (510) departing from the joint is connected with the air pump.

4. The flame detection assembly of claim 3, further comprising a detection probe (400);

the connector is a three-way connector (520) and comprises a first port (5211) connected with the outer conduit (100), a second port (5212) connected with the detection probe (400) and a third port (5221) connected with the cold air duct (510);

the optical fiber (300) is connected with the detection probe (400) after sequentially passing through the first port (5211) and the second port (5212).

5. The flame detection assembly of claim 4, wherein the tee fitting (520) includes a first tube (521) and a second tube (522);

the first port (5211) and the second port (5212) are respectively provided at both ends of the first pipe (521);

the second pipe (522) is connected to the middle of the first pipe (521), and an included angle between the extending direction of the second pipe (522) relative to the first pipe (521) and the flowing direction of cold air in the first pipe (521) is an obtuse angle.

6. The flame detection assembly of claim 4, further comprising a flange joint (600);

one end of the flange joint (600) is connected with the second port (5212), and the other end is connected with the detection probe (400);

the optical fiber (300) passes through the first port (5211), the second port (5212) and the flange joint (600) in sequence and then is connected with the detection probe (400).

7. A flame detection assembly according to claim 4, wherein a cable (700) is connected to an end of the detection probe (400) facing away from the optical fibre (300);

and/or a ball valve (530) is arranged on the cold air pipeline (510).

8. The flame detection assembly of any of claims 1-7, further comprising a quartz lens disposed at a front end of the optical fiber (300).

9. The flame detection assembly of any of claims 1-7, further comprising a mount (800);

the mounting member (800) is coupled to the outer pipe (100) to fix the flame detection assembly to a wall of a boiler.

10. A boiler flame detection system, comprising a flame detection assembly according to any of claims 1-9.

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