CN213713119U

CN213713119U - Flame detection device

Info

Publication number: CN213713119U
Application number: CN202022430130.2U
Authority: CN
Inventors: 卜玉忠; 梁鹤涛; 陈金洲; 张万林; 谷延辉; 王春和; 孙承志; 岳福春
Original assignee: Huaneng Hegang Power Generation Co ltd
Current assignee: Huaneng Hegang Power Generation Co ltd
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2021-07-16
Anticipated expiration: 2030-10-28

Abstract

The utility model relates to a flame detection device, this flame detection device is including the extension pipe that is located the inboard outer pipe of brickwork and is located the brickwork outside, the one end of outer pipe is connected on furnace, the other end of outer pipe is connected with the one end of extension pipe, the other end of extension pipe extends to keeping away from the brickwork direction, the inside of outer pipe and extension pipe is provided with the interior pipe that runs through outer pipe and extension pipe along the axial, the one end of interior pipe is connected on furnace, the other end of interior pipe is examined the probe connection with the fire that is located the brickwork outside, the inside of interior pipe is provided with the fiber bundle, the fiber bundle examines the probe connection with the fire. The utility model provides a flame detector life low, the not good technical problem of detection effect.

Description

Flame detection device

Technical Field

The utility model relates to a thermal power generation technical field, it is further, relate to a flame detection device, especially relate to a thermal power plant's furnace burning flame detection device that can increase of service cycle.

Background

The combustion flame is the most direct reflection for representing whether the combustion state is stable or not, the flame detector judges the combustion state of the boiler by detecting whether the flame exists in the hearth, and whether the hearth safety monitoring system is put into operation or not depends on whether the flame detector and the hearth fire-extinguishing protection device are reliable and perfect to a great extent. Therefore, the method can accurately and reliably detect the flame of the furnace, and is an important means for preventing the explosion of the furnace and ensuring the safe operation of the boiler. However, when the temperature of the environment is high (especially in summer), the worker finds that the fire detection probe often generates an alarm condition and is mostly distributed at the position of the burner in the middle layer of the boiler, the fire detection alarm can cause the on-off quantity of the fire detection probe to disappear, the non-stop condition is easily caused, the potential hazard is brought to the safe operation of the boiler, the wiring of the flame detector is also often damaged due to high-temperature aging, and therefore the service life is shortened, and the detection effect is poor.

Therefore, the inventor provides a flame detection device by virtue of experience and practice of related industries for many years, so as to overcome the defects of the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a flame detection device, under the prerequisite of guaranteeing that the optic fibre bundle has good signal transmission ability and anti-loss ability, avoided passing closely and leading to the condition that the fire detects the probe and easily damages to appear apart from the brickwork, the life of probe is examined in the extension fire, guarantees that the fire detects the homoenergetic normal operating of device under the different loads of boiler.

The purpose of the utility model can be realized by adopting the following technical scheme:

the utility model provides a flame detection device, flame detection device is including being located the inboard outer pipe of brickwork and being located the extension pipe in the brickwork outside, wherein:

the utility model discloses a fire detection device, including extension pipe, stove wall, outer pipe, inner pipe, fire detection probe, the one end of outer pipe is connected on the furnace, the other end of outer pipe with the one end of extension pipe is connected, the other end of extension pipe is to keeping away from the furnace wall direction extends, outer pipe with the inside of extension pipe is provided with along the axial and runs through outer pipe with the inner pipe of extension pipe, the one end of inner pipe is connected on the furnace, the other end of inner pipe with be located the fire detection probe in the furnace wall outside is connected, the inside of inner pipe is provided with the fiber bundle, the fiber bundle with the.

In a preferred embodiment of the present invention, the extension duct has an axial direction perpendicular to the furnace wall, and the length of the extension duct is greater than or equal to 1000 mm; the diameter of the optical fiber bundle is greater than or equal to 4 mm.

The utility model discloses an in a preferred embodiment, the inside of inner guide pipe is close to furnace one end is provided with convex lens subassembly, the one end of optic fibre bundle with convex lens subassembly is connected, the other end of optic fibre bundle with the probe is examined to the fire signal reception end electric connection, the probe is examined to the fire signal output part and cable assembly electric connection.

In a preferred embodiment of the present invention, the outer duct and the inner duct and the extension duct and the inner duct leave a gap therebetween, respectively, so that the outer duct and the inner duct and the extension duct and the inner duct form a communicating air duct therebetween, the extension duct is provided with an air supply opening communicating with the air duct, and the air supply opening is connected with the cooling air duct.

The utility model discloses an in a preferred embodiment, the extension pipe with be provided with air supply hose and connecting pipe between the cooling air duct, the one end of air supply hose with the supply-air outlet is connected, the other end of air supply hose with the one end of connecting pipe is connected, the other end of connecting pipe the cooling air duct connects, be provided with the valve on the connecting pipe.

In a preferred embodiment of the present invention, a first fixing member is disposed at a connecting position of the outer conduit and the extension conduit;

first fixed subassembly is including fixed section of thick bamboo and fixed cover, fixed cylinder sleeve is located outer pipe with on the hookup location of extension pipe, follow on the inner wall of fixed section of thick bamboo the circumference of fixed section of thick bamboo is provided with first boss, first boss compresses tightly outer pipe with the hookup location of extension pipe, the outer wall of fixed section of thick bamboo with the brickwork butt, a pot head of fixed cover is located the tip of fixed section of thick bamboo, the other end of fixed cover with the outer wall connection of extension pipe.

In a preferred embodiment of the present invention, at least one washer is disposed between the fixing sleeve and the fixing cylinder.

In a preferred embodiment of the present invention, a second fixing assembly is disposed between one end of the extension duct away from the furnace wall and the inner duct;

the second fixing component comprises a sealing sleeve and a sealing sleeve, the sealing sleeve is sleeved on the inner catheter, the inner wall of the sealing sleeve is tightly attached to the outer wall of the inner catheter, one end of the sealing sleeve is sleeved on the end portion of the extension catheter, and the inner wall of the other end of the sealing sleeve is tightly attached to the outer wall of the sealing sleeve.

In a preferred embodiment of the present invention, the inner guide tube and the outer guide tube are provided with a support ring therebetween, the support ring is sleeved on the inner guide tube, and the inner wall of the support ring abuts against the outer wall of the inner guide tube, and the outer wall of the support ring abuts against the inner wall of the outer guide tube.

In a preferred embodiment of the present invention, the extension duct is a telescopic tube.

From above, the utility model discloses a flame detection device's characteristics and advantage are: the distance between fire detection probe and the furnace wall is prolonged, the occurrence of unstable conditions of fire detection such as easy overtemperature and poor adaptability of the probe due to the fact that the fire detection probe is close to the furnace wall for installation is prevented, the fire detection probe is guaranteed to always work in a suitable temperature environment, the safety and the stability of boiler operation are improved, the adaptability of a unit is improved, the occurrence of abnormal shutdown conditions of the unit is avoided, the workload of field maintenance personnel is effectively reduced, and a large amount of production and maintenance cost can be saved.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

FIG. 1: is the structure schematic diagram of the flame detection device of the utility model.

FIG. 2: which is a partial enlargement of the position a in fig. 1.

FIG. 3: which is a partial enlarged view of the position B in fig. 1.

FIG. 4: a partial enlarged view of the position C in fig. 1.

FIG. 5: a partial enlarged view of the position D in fig. 1.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 1 to 4, the present invention provides a flame detection device, which comprises an outer conduit 3 located inside a furnace wall 14 and an extension conduit 15 located outside the furnace wall 14, wherein: the one end of outer pipe 3 is connected on furnace, the other end of outer pipe 3 is connected with the one end of extension pipe 15, the other end of extension pipe 15 extends to keeping away from 14 directions of furnace wall, the inside of outer pipe 3 and extension pipe 15 is provided with inner duct 2 that runs through outer pipe 3 and extension pipe 15 along the axial, the one end of inner duct 2 is connected on furnace, the other end of inner duct 2 is connected with the fire detection probe 1 that is located the furnace wall 14 outside, the inside of inner duct 2 is provided with fiber bundle 5, fiber bundle 5 is connected with fire detection probe 1.

In an alternative embodiment of the present invention, the extension duct 15 is axially perpendicular to the furnace wall 14, and the length of the extension duct 15 is greater than or equal to 1000 mm. The fire detection probe 1 is easy to damage due to overtemperature and mainly caused by heat radiation of a boiler, the environment temperature of the installation position of the fire detection probe 1 is about 80 ℃ in the actual working environment for measurement, and the distance between the fire detection probe 1 and the furnace wall 14 is 500mm at the moment; considering the influence of the ambient temperature on the fire detection probe 1, when the ambient temperature is about 55 ℃, the distance between the measuring point and the furnace wall is 1000mm, and the temperature is just lower than the allowable operating temperature of the fire detection probe 1, so that the length of the extension conduit 15 is more than or equal to 1000mm, and the safe and stable operation of the fire detection probe 1 can be ensured. Due to the arrangement of the extension duct 15, the length of the optical fiber bundle 5 needs to be increased on the original basis, and the light transmission performance of the optical fiber bundle 5 is slightly reduced (the light transmission performance of the optical fiber bundle 5 is reduced by about 3%) with the increase of the length of the optical fiber bundle 5. In order to improve the detection performance of the fire detection probe 1 and further calibrate the fire detection parameters, the gain of the fire detection probe 1 needs to be adjusted from 28 to 29 so as to ensure that the fire detection probe 1 can normally work under different loads of the boiler.

Further, the diameter of the optical fiber bundle 5 is greater than or equal to 4mm, and the diameter of the optical fiber bundle 5 needs to be increased due to the extension of the extension optical fiber bundle 5, so that the signal transmission capability and the loss resistance energy consumption of the optical fiber bundle 5 are improved, and the accuracy of flame data is ensured.

In an optional embodiment of the present invention, a thermal insulation layer is laid on the outer wall and/or the inner wall of the furnace wall 14, so as to improve the separation capability of the furnace wall 14 to thermal radiation, and further prevent the over-temperature damage of the fire detection probe 1.

The utility model discloses an optional embodiment, as shown in FIG. 1, the inside of inner catheter 2 is close to furnace one end and is provided with convex lens subassembly 4, and the one end and the convex lens subassembly 4 of optical fiber bundle 5 are connected, and the other end and the signal reception end electric connection of probe 1 are examined to the fire of optical fiber bundle 5, and the signal output part and the 6 electric connection of cable assembly of probe 1 are examined to the fire. The arrangement of the convex lens component 4 can reduce the dust adhesion capability and improve the detection accuracy, and can further increase the fire detection angle and capture target flames in a wider range.

Further, the distance between the arrangement position of the convex lens component 4 and one end of the inner guide pipe 2 close to the hearth is 2mm to 4 mm.

Further, the convex lens component 4 can be but is not limited to a plano-convex lens, and the convex lens component 4 is made of quartz and can resist temperature of more than 1200 ℃.

In an optional embodiment of the present invention, as shown in fig. 1 and 4, gaps are respectively left between the inner wall of the outer conduit 3 and the outer wall of the inner conduit 2 and between the inner wall of the extension conduit 15 and the outer wall of the inner conduit 2, so as to form a communicated air duct between the inner wall of the outer conduit 3 and the outer wall of the inner conduit 2 and between the inner wall of the extension conduit 15 and the outer wall of the inner conduit 2, an air supply opening 301 communicated with the air duct is provided near one end of the fire detection probe 1 on the extension conduit 15, and the air supply opening 301 is connected with the cooling air duct 7. The cooling air is conveyed into the air duct through the cooling air pipeline 7, so that an enough cold source is ensured to form an air film on the outer side of the inner guide pipe 2, the effect of blocking the optical fiber bundle 5 from the external high-temperature environment is achieved, the optical fiber bundle 5 is prevented from being melted due to overhigh temperature, and the normal work of the optical fiber bundle 5 is ensured.

Specifically, as shown in fig. 4, an air supply hose 8 and a connection pipe 9 are disposed between the extension duct 15 and the cooling air duct 7, the air supply hose 8 is made of a flexible material, the connection pipe 9 is made of a rigid material, one end of the air supply hose 8 is connected to the air supply opening 301, the other end of the air supply hose 8 is connected to one end of the connection pipe 9, the other end of the connection pipe 9 is connected to the cooling air duct 7, and a valve 10 is disposed on the connection pipe 9. The on-off state of the connecting pipe 9 is controlled by the valve 10, so that the air supply time is controlled, and the air pressure is not supplied at the terminal within 15min before ignition and 1.5h after flameout and furnace shutdown.

Further, the valve 10 may be, but is not limited to, a manual ball valve.

In an optional embodiment of the present invention, as shown in fig. 1 and fig. 2, a first fixing component 11 is disposed at a connection position of the outer catheter 3 and the extension catheter 15, and the stability of the connection of the outer catheter 3 and the extension catheter 15 is improved by the first fixing component 11.

Specifically, as shown in fig. 2, the first fixing assembly 11 includes a fixing cylinder 1101 and a fixing sleeve 1102, both the fixing cylinder 1101 and the fixing sleeve 1102 are cylindrical structures with openings at both ends, the fixing cylinder 1101 is sleeved on a connection position of the outer conduit 3 and the extension conduit 15, an annular first boss 11011 is arranged on an inner wall of the fixing cylinder 1101 along a circumferential direction of the fixing cylinder 1101, the first boss 11011 compresses the connection position of the outer conduit 3 and the extension conduit 15, an outer wall of the fixing cylinder 1101 abuts against a furnace wall 14, one end of the fixing sleeve 1102 is sleeved on an end portion of the fixing cylinder 1101, and the other end of the fixing sleeve 1102 is connected with an outer wall of the extension conduit 15. The outer guide pipe 3 and the extension guide pipe 15 are fixed by matching the fixing cylinder 1101 with the fixing sleeve 1102, and the fixing cylinder 1101 plays a role in protecting the outer guide pipe 3, so that the situation that the outer guide pipe 3 is damaged due to the fact that the furnace wall 14 directly extrudes the outer guide pipe 3 when being pressed is avoided.

Further, as shown in fig. 2, an annular second boss 11021 is disposed on an inner wall of the fixing sleeve 1102 along a circumferential direction of the fixing sleeve 1102, at least one bolt 1104 is connected between the second boss 11021 and an outer wall of the extension duct 15, at least one washer 1103 is sleeved on the extension duct 15 between the first boss 11011 and the second boss 11021, and two ends of the washer 1103 are respectively abutted to the first boss 11011 and the second boss 11021.

In an alternative embodiment of the present invention, as shown in fig. 1 and 3, a second fixing component 12 is disposed between one end of the extension duct 15 away from the furnace wall 14 and the inner duct 2, and the extension duct 15 is fixedly connected to the inner duct 2 through the second fixing component 12.

Specifically, as shown in fig. 3, the second fixing assembly 12 includes a plugging sleeve 1201 and a sealing sleeve 1202, both the plugging sleeve 1201 and the sealing sleeve 1202 are cylindrical structures with openings at both ends, the sealing sleeve 1202 is sleeved on the inner catheter 2, an inner wall of the sealing sleeve 1202 is tightly attached to an outer wall of the inner catheter 2, one end of the plugging sleeve 1201 is sleeved on an end of the extension catheter 15, and an inner wall of the other end of the plugging sleeve 1201 is tightly attached to an outer wall of the sealing sleeve 1202. By matching the plugging sleeve 1201 with the sealing sleeve 1202, not only stable connection between the extension duct 15 and the inner duct 2 is ensured, but also the connection position of the extension duct and the inner duct 2 is well sealed, thereby ensuring that cooling air flows in the whole air duct.

In an optional embodiment of the present invention, as shown in fig. 1 and 5, a support ring 13 is disposed between the inner conduit 2 and the outer conduit 3, the support ring 13 is of a circular ring structure, the support ring 13 is sleeved on the inner conduit 2, an inner wall of the support ring 13 abuts against an outer wall of the inner conduit 2, and an outer wall of the support ring 13 abuts against an inner wall of the outer conduit 3. The inner guide pipe 2 is supported in the outer guide pipe 3 by the support ring 13, and the stability of the inner guide pipe 2 installed in the outer guide pipe 3 is improved.

The utility model discloses an optional embodiment, extension pipe 15 can adopt flexible pipe, can adjust the length of extension pipe 15 according to actual ambient temperature to adjust the distance between fire detection probe 1 and the brickwork 14, guarantee that fire detection probe 1 is worked in suitable temperature environment all the time.

In the actual work process, the installation angle of the fire detection probe 1 can be adjusted, so that the fire detection probe 1 is aligned to the high-frequency region of flame, and the adaptability of the fire detection probe 1 under different working conditions and different flame states is improved. In addition, the delay function is arranged, the flame signal is still kept in the acquisition state within a period of time after the flame signal is lost due to the fact that the flame signal drifts indefinitely, the acquisition of the flame signal is stopped in a delayed mode, and misjudgment of the flame signal can be effectively avoided. Wherein the delay time is greater than or equal to 2 s.

The utility model discloses a flame detection device's characteristics and advantage are:

the flame detection device prolongs the distance between the fire detection probe 1 and the furnace wall 14 due to the fact that the extension guide pipe 15 is arranged on the outer side of the furnace wall 14, and prevents the situation that the fire detection is unstable due to the fact that the inner guide pipe 2 extends out of the outer side of the furnace wall 14 and then is directly connected with the fire detection probe 1, the fire detection probe 1 is installed close to the furnace wall 14, the probe is prone to being over-heated and poor in adaptability, and the like, so that the fire detection probe 1 is guaranteed to work in a proper temperature environment all the time, the safety and the stability of boiler operation are improved, the adaptability of a unit in a working environment with large AGC (automatic gain compensation) and primary frequency modulation check amplitude is improved, the abnormal shutdown situation of the unit is avoided, the workload of field maintenance personnel is effectively reduced, meanwhile, a large amount of production and maintenance cost can be saved, and the flame detection.

The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.

Claims

1. Flame detection device, characterized in that it comprises an outer conduit (3) located inside a furnace wall (14) and an elongated conduit (15) located outside said furnace wall (14), wherein:

the one end of outer pipe (3) is connected on furnace, the other end of outer pipe (3) with the one end of extension pipe (15) is connected, the other end of extension pipe (15) is to keeping away from brickwork (14) direction extends, outer pipe (3) with the inside of extension pipe (15) is provided with along the axial and runs through outer pipe (3) with interior pipe (2) of extension pipe (15), the one end of interior pipe (2) is connected on furnace, the other end of interior pipe (2) with be located fireexamine probe (1) in brickwork (14) outside and connect, the inside of interior pipe (2) is provided with optical fiber bundle (5), optical fiber bundle (5) with fireexamine probe (1) and connect.

2. Flame detection device according to claim 1, wherein the elongated conduit (15) has an axial direction perpendicular to the furnace wall (14) and the length of the elongated conduit (15) is greater than or equal to 1000 mm; the diameter of the optical fiber bundle (5) is larger than or equal to 4 mm.

3. The flame detection device according to claim 1, wherein a convex lens component (4) is arranged at one end of the inner guide pipe (2) close to the hearth, one end of the optical fiber bundle (5) is connected with the convex lens component (4), the other end of the optical fiber bundle (5) is electrically connected with a signal receiving end of the fire detection probe (1), and a signal output end of the fire detection probe (1) is electrically connected with a cable component (6).

4. The flame detection device according to claim 1, wherein gaps are respectively left between the outer duct (3) and the inner duct (2) and between the extension duct (15) and the inner duct (2) to form an air duct communicated between the outer duct (3) and the inner duct (2) and between the extension duct (15) and the inner duct (2), the extension duct (15) is provided with an air supply opening (301) communicated with the air duct, and the air supply opening (301) is connected with a cooling air duct (7).

5. The flame detection device according to claim 4, wherein an air supply hose (8) and a connection pipe (9) are provided between the extension duct (15) and the cooling air duct (7), one end of the air supply hose (8) is connected to the air supply port (301), the other end of the air supply hose (8) is connected to one end of the connection pipe (9), the other end of the connection pipe (9) is connected to the cooling air duct (7), and a valve (10) is provided on the connection pipe (9).

6. Flame detection device according to claim 1, characterized in that a first fixing assembly (11) is provided at the connection point of the outer conduit (3) and the elongated conduit (15);

first fixed subassembly (11) are including fixed section of thick bamboo (1101) and fixed cover (1102), fixed section of thick bamboo (1101) cover is located outer pipe (3) with on the hookup location of extension pipe (15), follow on the inner wall of fixed section of thick bamboo (1101) the circumference of fixed section of thick bamboo (1101) is provided with first boss (11011), first boss (11011) compress tightly outer pipe (3) with the hookup location of extension pipe (15), the outer wall of fixed section of thick bamboo (1101) with furnace wall (14) butt, the pot head of fixed cover (1102) is located the tip of fixed section of thick bamboo (1101), the other end of fixed cover (1102) with the outer wall connection of extension pipe (15).

7. Flame detection device according to claim 6, characterized in that at least one washer (1103) is arranged between said fixed sleeve (1102) and said fixed cylinder (1101).

8. Flame detection device according to claim 1, wherein a second fixing member (12) is arranged between the end of the elongated conduit (15) remote from the furnace wall (14) and the inner conduit (2);

the second fixing component (12) comprises a plugging sleeve (1201) and a sealing sleeve (1202), the sealing sleeve (1202) is sleeved on the inner catheter (2), the inner wall of the sealing sleeve (1202) is tightly attached to the outer wall of the inner catheter (2), one end of the plugging sleeve (1201) is sleeved on the end portion of the extension catheter (15), and the inner wall of the other end of the plugging sleeve (1201) is tightly attached to the outer wall of the sealing sleeve (1202).

9. Flame detection device according to claim 1, characterized in that a support ring (13) is arranged between the inner conduit (2) and the outer conduit (3), the support ring (13) is sleeved on the inner conduit (2), and the inner wall of the support ring (13) abuts against the outer wall of the inner conduit (2), and the outer wall of the support ring (13) abuts against the inner wall of the outer conduit (3).

10. Flame detection device according to claim 1, wherein the elongated duct (15) is a telescopic tube.