CN217464408U

CN217464408U - Ignition control system of circulating fluidized bed boiler

Info

Publication number: CN217464408U
Application number: CN202221039650.3U
Authority: CN
Inventors: 马永; 朱忠志; 张洪
Original assignee: Zhejiang Hetai Thermal Power Co ltd
Current assignee: Zhejiang Hetai Thermal Power Co ltd
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-09-20
Anticipated expiration: 2032-04-28

Abstract

The utility model relates to an ignition control system of a circulating fluidized bed boiler, which comprises an oil tank, a first burner, a second burner, a lower air chamber of a boiler bed, a first ignition oil supply pump, a second ignition oil supply pump and an air compressor, the first combustor and the second combustor respectively comprise a combustor shell, an oil gun and an ignition gun, the oil outlet pipe and the atomized compressed air pipeline are both communicated with an oil gun, an ignition air duct communicated to an air chamber under a boiler bed is arranged in the combustor shell, the oil gun and the ignition gun are both arranged on the burner shell and penetrate through the ignition air duct, the ignition gun is sleeved with a heat insulation sleeve, be equipped with actuating mechanism on the radiation shield, actuating mechanism is used for driving the burning torch and releases and indentation radiation shield, the utility model discloses the ignition effect is stable to the burning torch has ignited the back, moves back into in the radiation shield, has improved life.

Description

Ignition control system of circulating fluidized bed boiler

Technical Field

The utility model relates to a circulating fluidized bed boiler technical field, especially a circulating fluidized bed boiler's ignition control system.

Background

Circulating fluidized bed boilers are the most industrialized clean coal combustion technology. The circulating fluidized bed boiler adopts fluidized combustion, and the main structure comprises a combustion chamber (comprising a dense phase region and a dilute phase region) and a circulating return furnace (comprising a high-temperature gas-solid separator and a return system). The biggest difference from the bubbling fluidized bed combustion technology is that the operation wind speed is high, heterogeneous reaction processes such as combustion, desulfurization and the like are strengthened, the boiler capacity can be expanded to a large capacity (600MW or above grade) acceptable by the power industry, at present, the circulating fluidized bed boiler well solves the basic problems such as thermal, mechanical and material science and the engineering problems such as expansion, abrasion and overtemperature, and becomes an advanced technology for energy utilization of difficult-to-burn solid fuels (such as coal gangue, oil shale, municipal refuse, sludge and other wastes).

The existing ignition control system of the circulating fluidized bed boiler has unstable ignition effect, and the service life of an ignition gun on the existing ignition control system is short under a long-term combustion state.

SUMMERY OF THE UTILITY MODEL

The utility model provides an ignition control system of circulating fluidized bed boiler, its ignition effect is stable to after having lighted, the burning torch can move back into in the thermal-insulated cover, has improved life, has solved the above-mentioned problem that exists among the prior art in the use.

The technical scheme of the utility model is realized like this: an ignition control system of a circulating fluidized bed boiler comprises an oil tank, a first combustor, a second combustor, a lower air chamber of a boiler bed, a first ignition oil supply pump, a second ignition oil supply pump and an air compressor, wherein the first ignition oil supply pump and the second ignition oil supply pump are both connected with oil pipes communicated with the oil tank, the first ignition oil supply pump and the second ignition oil supply pump are respectively connected with oil outlet pipes communicated with the first combustor and the second combustor, the air compressor is connected with atomized compressed air pipelines respectively communicated with the first combustor and the second combustor, the first combustor and the second combustor are both arranged on the lower air chamber of the boiler bed, the first combustor and the second combustor respectively comprise a combustor shell, an oil gun and an ignition gun, the oil outlet pipes and the atomized compressed air pipelines are both communicated with the oil gun, an ignition air duct communicated with the lower air chamber of the boiler bed is arranged in the combustor shell, the oil gun and the ignition gun are both installed on the combustor shell and penetrate into the ignition air duct, a heat insulation sleeve is sleeved outside the ignition gun, and a driving mechanism is arranged on the heat insulation sleeve and used for driving the ignition gun to be pushed out and retracted into the heat insulation sleeve.

Preferably, radiation shield fixed connection is on the combustor casing, the ignition wind channel is penetrated into in the inner of radiation shield, the outer end of radiation shield is located the combustor casing outside, be equipped with the push rod in the radiation shield, the push rod is the prism form, the radiation shield is equipped with the spacing seat of push rod, the push rod slides and sets up on the spacing seat of push rod, the burning torch is connected and is served towards one in ignition wind channel at the push rod, actuating mechanism is located and is used for controlling the push rod on the other end of push rod, open the inner of radiation shield has the opening that is used for supplying burning torch to penetrate out.

Preferably, actuating mechanism is including bearing, axis of rotation, lead screw, driven gear, driving gear and motor, the bearing is connected on the outer end of radiation shield casing, the axis of rotation rotates to be connected on the bearing, driven gear connects in the axis of rotation, driving gear is connected on the motor, the driving gear meshes with driven gear mutually, it has the screw hole that runs through its both ends to be the axial in the axis of rotation to open, lead screw threaded connection is on the screw hole, lead screw and push rod fixed connection.

Preferably, the opening upper cover is closed with a door blocking plate, and one side of the door blocking plate is hinged to the inner end of the heat insulation sleeve.

Preferably, the oil gun comprises an outer tube, an inner tube, an atomizing head and a gun head, wherein the inner tube is fixedly arranged inside the outer tube, an oil passage is formed in the inner tube, an air passage is formed in the outer tube, the outer tube is connected with the air connector and the oil connector, the air connector is communicated with the air passage, the oil connector is communicated with the oil passage, one end of the inner tube, which is positioned in the combustor shell, is connected with the atomizing head, the gun head is connected to an ignition air passage on the outer tube, the gun head is sleeved outside the atomizing head, and the atomizing head is communicated with the air passage.

Preferably, the air compressor is connected with a purging pipe communicated with the oil outlet pipe, and the purging pipe is provided with a purging valve.

Preferably, the oil outlet pipe is connected with an oil return pipe, and the oil return pipe is communicated with the oil tank.

To sum up, the beneficial effects of the utility model reside in that:

1. the utility model discloses a first ignition fuel feed pump and second ignition fuel feed pump give the oil gun fuel feeding on first combustor and the second combustor respectively, and the air compressor machine passes through atomizing compressed air pipeline and carries into the oil gun with compressed air, makes the diesel oil atomizing that gets into the ignition wind channel through the oil gun, actuating mechanism just releases the radiation shield casing with the burning torch before this, waits diesel oil entering oil gun, and the burning torch just ignites, and the diesel oil after the atomizing is lighted more easily, and the diesel oil of burning torch after the atomizing is lighted in the back just through actuating mechanism indentation radiation shield casing, to sum up, the utility model discloses the effect of igniting is stable to the burning torch has improved life in the radiation shield casing after having lighted.

2. The shutter plate can cover the through hole after the ignition gun retracts into the through hole, so that the ignition gun is better protected.

Drawings

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

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of a partial cross-sectional structure of a first burner according to the present invention;

fig. 3 is a partially enlarged schematic view of fig. 2.

In the figure: 1. an oil tank; 2. a first burner; 3. a second combustor; 4. a boiler bed bottom plenum; 5. a first ignition oil feed pump; 6. a second ignition fuel feed pump; 7. an air compressor; 8. an oil pipe; 9. an oil outlet pipe; 10. an atomized compressed air conduit; 11. a burner housing; 12. an oil gun; 13. an ignition gun; 14. an ignition air duct; 15. a heat insulating sleeve; 16. a push rod; 17. a push rod limiting seat; 18. a port; 19. a bearing; 20. a rotating shaft; 21. a screw rod; 22. a driven gear; 23. a driving gear; 24. a motor; 25. a threaded hole; 26. a door stopper plate; 27. an outer tube; 28. an inner tube; 29. an atomizing head; 30. a gun head; 31. an oil passing channel; 32. a gas passage; 33. a gas joint; 34. an oil joint; 35. a purge tube; 36. a purge valve; 37. an oil return pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying fig. 1-3 in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Example (b):

as shown in fig. 1 to 3, the utility model discloses an ignition control system of a circulating fluidized bed boiler, which comprises an oil tank 1, a first burner 2, a second burner 3, a lower chamber 4 of a boiler bed, a first ignition oil supply pump 5, a second ignition oil supply pump 6 and an air compressor 7, wherein the first ignition oil supply pump 5 and the second ignition oil supply pump 6 are both connected with an oil pipe 8 communicated with the oil tank 1, the first ignition oil supply pump 5 and the second ignition oil supply pump 6 are respectively connected with an oil outlet pipe 9 communicated with the first burner 2 and the second burner 3, in addition, the air compressor 7 is connected with an atomized compressed air pipeline 10 respectively communicated with the first burner 2 and the second burner 3, the first burner 2 and the second burner 3 are both arranged on the lower chamber 4 of the boiler bed, the lower chamber 4 of the boiler bed is arranged at the lower side position of the circulating fluidized bed boiler, in addition, the first combustor 2 and the second combustor 3 each include a combustor casing 11, an oil gun 12 and an ignition gun 13, the oil outlet pipe 9 and the atomized compressed air pipeline 10 are both communicated with the oil gun 12, wherein an ignition air duct 14 leading to the lower air chamber 4 of the boiler bed is arranged in the combustor casing 11, the oil gun 12 and the ignition gun 13 are both mounted on the combustor casing 11 and penetrate through the ignition air duct 14, in order to protect the ignition gun 13 and prevent the ignition gun 13 from being in a combustion environment for a long time, a heat insulation sleeve 15 is sleeved outside the ignition gun 13, and a driving mechanism is arranged on the heat insulation sleeve 15 and used for driving the ignition gun 13 to push out and retract into the heat insulation sleeve 15.

Specifically, the heat insulating sleeve 15 is fixedly connected to the burner housing 11, the inner end of the heat insulating sleeve 15 penetrates into the ignition air duct 14, the outer end of the heat insulating sleeve 15 is located outside the burner housing 11, a push rod 16 is arranged in the heat insulating sleeve 15, the push rod 16 is prism-shaped, the heat insulating sleeve 15 is provided with a push rod limiting seat 17, the push rod 16 is slidably arranged on the push rod limiting seat 17, the structure of the push rod 16 ensures that the push rod 16 cannot rotate relative to the push rod limiting seat 17, wherein the ignition gun 13 is connected to one end, facing the ignition air duct 14, of the push rod 16, the driving mechanism is located at the other end of the push rod 16 and used for controlling the push rod 16, and in addition, the inner end of the heat insulating sleeve 15 is provided with a through hole 18 through which the ignition gun 13 penetrates. More specifically, the driving mechanism includes a bearing 19, a rotating shaft 20, a screw rod 21, a driven gear 22, a driving gear 23 and a motor 24, wherein the bearing 19 is connected to the outer end of the heat insulation sleeve 15, the rotating shaft 20 is rotatably connected to the bearing 19, the driven gear 22 is connected to the rotating shaft 20, the driving gear 23 is connected to the motor 24, the driving gear 23 is engaged with the driven gear 22, a threaded hole 25 is axially formed in the rotating shaft 20 and penetrates through both ends of the rotating shaft, the screw rod 21 is threadedly connected to the threaded hole 25, and the screw rod 21 is fixedly connected to the push rod 16, the motor 24 drives the driving gear 23, so that the rotating shaft 20 is driven to rotate relative to the bearing 19 by the driven gear 22, the screw rod 21 cannot rotate due to being connected to the push rod 16, and therefore, the screw rod 21 is driven to move by the screw hole 25 when the rotating shaft 20 rotates, therefore, the push rod 16 synchronously slides on the push rod limiting seat 17 along with the screw rod 21, and the ignition gun 13 connected to the push rod 16 can be pushed out and retracted into the heat insulation sleeve 15.

In order to further improve the protection of the ignition gun 13, a shutter plate 26 is covered on the through opening 18, one side of the shutter plate 26 is hinged to the inner end of the heat insulation sleeve 15, when the ignition gun 13 is pushed out of the through opening 18 by the push rod 16, the shutter plate 26 is abutted to the opening of the shutter plate 26, when the ignition gun 13 retracts into the through opening 18, the shutter plate 26 is covered on the through opening 18 again due to gravity, and in addition, a torsion spring can be matched and arranged on the shutter plate 26 and used for driving the shutter plate 26 to rotate towards the through opening.

Furthermore, the oil gun 12 comprises an outer tube 27, an inner tube 28, an atomizing head 29 and a gun head 30, wherein the inner tube 28 is fixedly arranged inside the outer tube 27, the inner tube 28 is internally provided with an oil passage 31, the outer tube 27 is internally provided with an air passage 32, the outer tube 27 is connected with an air connector 33 and an oil connector 34, the air connector 33 is communicated with the air passage 32, the oil connector 34 is communicated with the oil passage 31, the inner tube 28 is connected with the atomizing head 29 at one end positioned inside the burner shell 11, the outer tube 27 is connected with the gun head 30 communicated with the ignition air duct 14, the gun head 30 is sleeved outside the atomizing head 29, the atomizing head 29 is communicated with the air passage 32, diesel oil enters the inner tube 28 from the oil connector 34 through the oil outlet pipe 9 and reaches the atomizing head 29 from the oil passage 31, meanwhile, compressed air enters the outer tube 27 from the air connector 33 through the atomizing compressed air duct 10 and then enters the atomizing head 29 from the air passage 32, the diesel oil passing through the atomizing head 29 is atomized, and the atomized diesel oil enters the ignition air duct 14 from the gun head 30, so that the ignition gun 13 can ignite conveniently.

In order to clean the oil outlet pipe 9 and the oil gun 12 conveniently, the air compressor 7 is connected with a purging pipe 35 communicated with the oil outlet pipe 9, and the purging pipe 35 is provided with a purging valve 36.

In order to stop the supply of oil after the ignition of the coal in the circulating fluidized bed boiler and to allow the excess oil on the oil outlet pipe 9 to flow back to the oil tank 1, an oil return pipe 37 is connected to the oil outlet pipe 9, and the oil return pipe 37 is connected to the oil tank 1.

The utility model discloses a theory of operation: when ignition is performed, the purging valve 36 is opened to blow compressed air into the oil outlet pipe 9 and the oil gun 12 from the purging pipe 35 for 2 to 3 minutes, the purge valve 36 is then closed, and the ignition gun 13 is then pushed out of the insulating sleeve 15 by the drive mechanism, then the oil guns 12 on the first combustor 2 and the second combustor 3 are respectively supplied with oil through a first ignition oil supply pump 5 and a second ignition oil supply pump 6, the air compressor 7 sends compressed air into the oil guns 12 through an atomized compressed air pipeline 10, so that diesel oil entering an ignition air duct 14 through the oil guns 12 is atomized, at the moment, the ignition guns 13 start to ignite, the ignition guns 13 are retracted into the heat insulation sleeve 15 through a driving mechanism after the atomized diesel oil is ignited, and then, when the temperature in the circulating fluidized bed boiler rises to 650 ℃, coal is added, the oil feeding is stopped after the coal is burnt, and the redundant oil on the oil outlet pipe 9 flows to the oil tank 1 through the oil return pipe 37.

The utility model that should point out simultaneously indicates the terminology, like: the directional or positional relationships indicated as "front", "rear", "vertical", "horizontal", etc. are based on the directional or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of the invention.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An ignition control system for a circulating fluidized bed boiler, characterized by: the oil tank, the first combustor, the second combustor, the lower air chamber of the boiler bed, the first ignition oil supply pump, the second ignition oil supply pump and the air compressor are included, the oil outlet pipe is communicated with the first combustor and the second combustor respectively, the first combustor and the second combustor are installed on the lower air chamber of the boiler bed, the first combustor and the second combustor respectively comprise a combustor shell, an oil gun and an ignition gun, the oil outlet pipe and the atomized compressed air pipe are communicated with the oil gun respectively, an ignition air duct communicated with the lower air chamber of the boiler bed is arranged in the combustor shell, the oil gun and the ignition gun are installed on the combustor shell and penetrate through the ignition air duct, the ignition gun is sleeved with a heat insulation sleeve, the heat insulation sleeve is provided with a driving mechanism, and the driving mechanism is used for driving the ignition gun to be pushed out and retracted into the heat insulation sleeve.

2. The ignition control system of a circulating fluidized bed boiler according to claim 1, wherein: the utility model discloses a burner, including combustor casing, combustion chamber, driving mechanism, heat shield sleeve, push rod, spacing seat of push rod, the heat shield sleeve is fixed connection on the combustor casing, the inner penetration of heat shield sleeve advances the ignition wind channel, the outer end of heat shield sleeve is located the combustor casing outside, be equipped with the push rod in the heat shield sleeve, the push rod is the prism form, the heat shield sleeve is equipped with the spacing seat of push rod, the push rod slides and sets up on the spacing seat of push rod, the burning torch is connected and is served towards one in the ignition wind channel of push rod, actuating mechanism is located and is used for controlling the push rod on the other end of push rod, the inner of heat shield sleeve is opened there is the opening that is used for supplying the burning torch to penetrate out.

3. The ignition control system of a circulating fluidized bed boiler according to claim 2, characterized in that: actuating mechanism is including bearing, axis of rotation, lead screw, driven gear, driving gear and motor, the bearing is connected on the outer end of radiation shield casing, the axis of rotation is rotated and is connected on the bearing, driven gear connects in the axis of rotation, the driving gear is connected on the motor, the driving gear meshes with driven gear mutually, it has the screw hole that runs through its both ends to be opened to the axial in the axis of rotation, lead screw threaded connection is on the screw hole, lead screw and push rod fixed connection.

4. The ignition control system of a circulating fluidized bed boiler according to claim 2, characterized in that: the opening upper cover is closed with a door blocking plate, and one side of the door blocking plate is hinged to the inner end of the heat insulation sleeve.

5. The ignition control system of a circulating fluidized bed boiler according to claim 1, wherein: the oil gun comprises an outer pipe, an inner pipe, an atomizing head and a gun head, wherein the inner pipe is fixedly arranged inside the outer pipe, an oil passing channel is formed in the inner pipe, an air passing channel is formed in the outer pipe, an air connector and an oil connector are connected to the outer pipe, the air connector is communicated with the air passing channel, the oil connector is communicated with the oil passing channel, the atomizing head is connected to one end of the inner pipe, which is located in a combustor shell, the gun head which passes through an ignition air channel is connected to the outer pipe, the gun head is sleeved outside the atomizing head, and the atomizing head is communicated with the air passing channel.

6. The ignition control system of a circulating fluidized bed boiler according to claim 1, wherein: the air compressor is connected with a purging pipe communicated to the oil outlet pipe, and a purging valve is arranged on the purging pipe.

7. The ignition control system of a circulating fluidized bed boiler according to claim 1, wherein: and the oil outlet pipe is connected with an oil return pipe, and the oil return pipe is communicated with an oil tank.