CN215909073U - Device for blowing ash to hearth of ultra-supercritical boiler - Google Patents
Device for blowing ash to hearth of ultra-supercritical boiler Download PDFInfo
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- CN215909073U CN215909073U CN202120292959.2U CN202120292959U CN215909073U CN 215909073 U CN215909073 U CN 215909073U CN 202120292959 U CN202120292959 U CN 202120292959U CN 215909073 U CN215909073 U CN 215909073U
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- soot blower
- spiral pipe
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Abstract
The utility model relates to a device for blowing soot of a hearth of a supercritical (super) boiler, which comprises a soot blower spiral pipe and a spray head, wherein the soot blower spiral pipe is arranged in the side wall of the hearth of the boiler, the spray head is fixed at the end part of the soot blower spiral pipe, one end of the spray head extends into the hearth, the side wall of the end is provided with a spray nozzle, the section of the outlet of the spray nozzle is semicircular, and the spray nozzle of the device is semicircular, and the bottom surface of the spray nozzle is parallel to the tube wall of a water wall, so that the bottommost steam jet flow sprayed by the soot blower is parallel to the tube wall of the water wall, and the aim of blowing soot without blowing the tube row of the water wall is fulfilled.
Description
Technical Field
The utility model relates to a device for blowing soot in a hearth of a supercritical (super) boiler, belonging to the technical field of steam soot blowing of power station boilers.
Background
The existing purging nozzle is a cylinder body with a closed top end and an open bottom end, two venturi nozzles are arranged on the side wall of the nozzle, a nozzle is circular, the two venturi nozzles are arranged on the side wall of the nozzle in a relative mode, and the nozzle is arranged in the direction perpendicular to the water wall tube bank surface. The soot is swept by high-temperature and high-pressure steam and taken away by flowing flue gas, as shown in fig. 3, when the blower is actually put into soot blowing, part of steam sprayed by the nozzle can be blown to the water wall tube bank, so that the tube bank is abraded, the wall of the water wall is thinned in a large area, and even tube explosion can be caused. In order to reduce the wear of the water-cooled wall, the prior art means include the following ways:
1. and an anti-abrasion cover plate is additionally arranged around the nozzle. The processing method of the anti-abrasion cover plate adopts the die to press and form, which inevitably increases the production cost greatly.
2. The steam pressure is reduced. The steam pressure is reduced, the purging area is reduced, and the purging effect is weakened.
3. The frequency of purging is reduced. The method has the disadvantages of increasing the possibility of coking of the hearth and having production safety risk.
4. The extension distance of the soot blowing gun entering the hearth is increased. The defects are that because the temperature in the hearth is high, if the hearth is not withdrawn timely, the part entering the hearth is easily burnt off, the part directly drops on the slope water-cooled wall of the hearth, and the spray head falling from a high position can break the water-cooled wall pipe to cause the leakage and pipe explosion of the water-cooled wall pipe. In addition, the spray head falls into the slag conveyor to clamp the slag conveyor and cannot work normally.
5. The soot blower is not used for a long time. The method has the defects that the water-cooled wall is easy to coke, and the ash flow and the coking cause abrasion and smashing damage to the slope water-cooled wall of the furnace bottom, thereby causing tube explosion.
6. Reduce the soot blowing area and only allow the rotating half shaft of the soot blower nozzle. The disadvantage is that the water wall in the half shaft is still seriously blown.
In addition, the connection mode of the spray head and the soot blower in the prior art is threaded connection, and the spray head can fall off due to multiple rotations during operation and fall on a slope water-cooled wall at the bottom of the furnace to damage the water-cooled wall by smashing.
SUMMERY OF THE UTILITY MODEL
The utility model provides a boiler furnace soot blowing device which is not easy to blow water wall tube rows in order to solve the problems in the prior art.
In order to achieve the purpose, the technical scheme provided by the utility model is as follows: the utility model provides a device that is used for super (super) critical boiler furnace to blow grey, includes soot blower spiral pipe and shower nozzle, the soot blower spiral pipe sets up in boiler furnace lateral wall, the shower nozzle is fixed at soot blower spiral pipe end portion, and shower nozzle one end is stretched into in the furnace, and this end lateral wall is equipped with the nozzle, nozzle outlet cross-section semicircular in shape.
The technical scheme is further designed as follows: the nozzle is a semicircular Venturi nozzle.
The inner side of the side wall of the boiler furnace is provided with a water-cooled wall tube bank, and the semicircular bottom surface of the nozzle is parallel to the water-cooled wall tube bank.
The soot blower spiral pipe is cylindrical, a connecting rod is arranged at the front end of the soot blower spiral pipe, external threads are arranged on the connecting rod, the spray head is sealed at the front end, the spray head is cylindrical with an opening at the rear end, internal threads matched with the external threads of the connecting rod are arranged on the inner wall of the rear end of the spray head, and the spray head is fixed on the soot blower spiral pipe through the threaded connection of the internal threads and the external threads.
The diameter of the connecting rod is smaller than that of the spiral pipe of the soot blower, and the end face of the rear end of the spray head is welded with the end face of the front end of the spiral pipe of the soot blower.
The front end of the spray head is in a round table shape with a smooth surface.
Two nozzles are arranged on the sprayer and symmetrically arranged on two sides of the front end of the sprayer.
The outer diameter phi of the spray head is 63mm, and the wall thickness is 5 mm.
The outer diameter of the nozzle is 22.5mm, and the inner diameter is 19.5 mm.
And a wall box is arranged on the side wall of the hearth, and the soot blower spiral pipe is arranged in the wall box.
The utility model has the beneficial effects that:
in the utility model, the steam jet flow at the bottommost layer of the soot blower is parallel to the tube wall of the water wall, so that the aim of blowing only soot without blowing the tube row of the water wall is fulfilled.
Compared with the reconstruction measures such as additionally arranging an anti-abrasion cover plate and spraying, the reconstruction cost of the blowing device is greatly reduced. The purging device does not need to adjust steam pressure, and the purging effect and the purging area are guaranteed; the purging device does not need to change and adjust the original purging frequency, so that the possibility of coking of the hearth is reduced; the blowing device does not need to adjust the extension distance of the spray head, reduces the possibility of burning loss of the spray head and improves the safety of the unit; the blowing device can effectively prevent the problem that the bottom slope wall is abraded due to the fact that ash flow is accumulated along the water-cooled wall due to untimely ash blowing.
According to the blowing device, the spray head is welded on the spiral pipe of the soot blower, so that the water cooling wall pipe of the furnace bottom slope wall can be effectively prevented from being smashed by preventing the spray head from falling accidentally, and the safe operation of the unit is guaranteed.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of the usage state of FIG. 1;
FIG. 3 is a schematic diagram of the use state of a conventional soot blower.
In the figure: 1-nozzle 1, 2-nozzle 2, 3-corner spot welding, 4-soot blower spiral tube, 5-nozzle, 6-steam jet, 7-water wall tube row, 8-wall box and 9-casting material.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in fig. 1 to 2, the device for blowing soot of a furnace of a supercritical (super) boiler of the present embodiment includes a soot blower spiral pipe 4 and a spray head 5, wherein the soot blower spiral pipe 4 is arranged in a side wall of the furnace of the boiler, the spray head 5 is fixed at an end of the soot blower spiral pipe 4, one end of the spray head extends into the furnace, the end side wall is provided with a spray nozzle, and the spray nozzles 1 and 2 are both semicircular venturi nozzles.
The boiler furnace side wall is formed by pouring a pouring material 9, a wall box 8 is arranged on the furnace side wall, the soot blower spiral tube 4 is arranged in the wall box 8, a water wall tube bank 7 is arranged on the inner side of the boiler furnace side wall, the soot blower spiral tube 4 is perpendicular to the water wall tube bank 7 and is installed, and the semicircular bottom surface of the nozzle is parallel to the water wall tube bank 7.
Soot blower spiral pipe 4 is cylindricly, and 4 front ends of soot blower spiral pipe are equipped with hollow connecting rod, be equipped with the external screw thread on the connecting rod, shower nozzle 5 is that the front end is sealed, and rear end open-ended is cylindric, and 5 rear end inner walls of shower nozzle are equipped with connecting rod external screw thread complex internal thread, shower nozzle 5 is fixed on soot blower spiral pipe 4 through the spiro union of internal thread and external screw thread, because the connecting rod diameter is less than soot blower spiral pipe 4 diameter, form annular terminal surface at 4 front ends of soot blower spiral pipe, 5 rear end terminal surfaces of shower nozzle and 4 front ends of soot blower spiral pipe adopt bight spot welding 3's welding method fixed.
The front end of the spray head 5 is a round table with a smooth surface, the front end of the spray head 5 extends into the hearth, and the side wall of the front end is symmetrically provided with a semicircular Venturi nozzle 1 and a semicircular nozzle 2.
In this embodiment, the spray heads 5 are arranged in the direction perpendicular to the water wall tube bank 7; the outer diameter phi of the cylindrical body of the spray head 5 is 63mm, the wall thickness is 5mm, the material is ZGCr20Ni14Si2, the outer diameter phi of the spray nozzle 1 and the spray nozzle 2 is 22.5mm, and the inner diameter phi is 19.5 mm.
Referring to fig. 2, when the soot blower of the present embodiment purges, steam enters the spray head 5 through the spiral tube 4 of the soot blower and the connecting rod, and then is sprayed out of the well, and the steam jet 6 at the bottommost layer ejected by the spray nozzle is parallel to the water wall tube bank 7, so that the purpose of blowing only soot without blowing the water wall tube bank is achieved.
The technical scheme of the embodiment is different from the prior art, and as shown in a combined figure 3, the connection mode of the spray head and the soot blower in the prior art is threaded connection, and the spray head 5 is prevented from falling into a hearth and smashing a water cooling wall during operation by adopting a corner spot welding method for fixing in the embodiment on the basis. Simultaneously, two original circular venturi nozzles are changed into two semicircular venturi nozzles, and the bottom surfaces of the nozzles are parallel to the water wall tube bank surface.
Example two
The structure of the device for blowing the ash of the supercritical boiler furnace is basically the same as that of the first embodiment, and the device comprises a spiral ash blower pipe 4 and a spray head 5, wherein the spiral ash blower pipe 4 is arranged in the side wall of the boiler furnace, the spray head 5 is fixed at the end part of the spiral ash blower pipe 4, one end of the spray head extends into the furnace, the side wall of the end is provided with a spray nozzle, and the spray nozzles 1 and 2 are semicircular Venturi nozzles. The boiler furnace side wall is provided with a wall box 8, the soot blower spiral tube 4 is arranged in the wall box 8, the inner side of the boiler furnace side wall is provided with a water wall tube bank 7, the soot blower spiral tube 4 is arranged perpendicular to the water wall tube bank 7, and the semicircular bottom surface of the nozzle is parallel to the water wall tube bank 7.
Soot blower spiral pipe 4 is cylindricly, and 4 front ends of soot blower spiral pipe are equipped with hollow connecting rod, be equipped with the external screw thread on the connecting rod, shower nozzle 5 is that the front end is sealed, and rear end open-ended is cylindric, and 5 rear end inner walls of shower nozzle are equipped with connecting rod external screw thread complex internal thread, shower nozzle 5 is fixed on soot blower spiral pipe 4 through the spiro union of internal thread and external screw thread, because the connecting rod diameter is less than soot blower spiral pipe 4 diameter, form annular terminal surface at 4 front ends of soot blower spiral pipe, 5 rear end terminal surfaces of shower nozzle and 4 front ends of soot blower spiral pipe adopt bight spot welding 3's welding method fixed.
The front end of the spray head 5 is a round table with a smooth surface, the front end of the spray head 5 extends into the hearth, and four semicircular Venturi nozzles are circumferentially arranged on the side wall of the front end of the spray head so as to improve the sweeping efficiency of the hearth.
In this embodiment, the spray heads 5 are arranged in the direction perpendicular to the water wall tube bank 7; the outer diameter phi of the cylindrical body of the spray head 5 is 63mm, the wall thickness is 5mm, the material is ZGCr20Ni14Si2, the outer diameter phi of the spray nozzle is 22.5mm, and the inner diameter phi of the spray nozzle is 19.5 mm.
The foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the utility model and these modifications should also be considered as the protection scope of the utility model.
Claims (10)
1. The utility model provides a device that is used for ultra supercritical boiler furnace to blow ash which characterized in that: the spiral pipe of the soot blower is arranged in the side wall of a boiler furnace, the nozzle is fixed at the end part of the spiral pipe of the soot blower, one end of the nozzle extends into the furnace, the side wall of the end is provided with a nozzle, and the section of the outlet of the nozzle is semicircular.
2. The device for ultra supercritical boiler furnace soot blowing according to claim 1 is characterized in that: the nozzle is a semicircular Venturi nozzle.
3. The device for ultra supercritical boiler furnace soot blowing according to claim 2 is characterized in that: the inner side of the side wall of the boiler furnace is provided with a water-cooled wall tube bank, and the semicircular bottom surface of the nozzle is parallel to the water-cooled wall tube bank.
4. The device for ultra supercritical boiler furnace soot blowing according to claim 3, characterized by: the soot blower spiral pipe is cylindrical, a connecting rod is arranged at the front end of the soot blower spiral pipe, external threads are arranged on the connecting rod, the spray head is sealed at the front end, the spray head is cylindrical with an opening at the rear end, internal threads matched with the external threads of the connecting rod are arranged on the inner wall of the rear end of the spray head, and the spray head is fixed on the soot blower spiral pipe through the threaded connection of the internal threads and the external threads.
5. The device for ultra supercritical boiler furnace soot blowing according to claim 4, characterized by: the diameter of the connecting rod is smaller than that of the spiral pipe of the soot blower, and the end face of the rear end of the spray head is welded with the end face of the front end of the spiral pipe of the soot blower.
6. The device for ultra supercritical boiler furnace soot blowing according to claim 5, characterized by: the front end of the spray head is in a round table shape with a smooth surface.
7. The device for ultra supercritical boiler furnace soot blowing according to claim 6, characterized by: two nozzles are arranged on the sprayer and symmetrically arranged on two sides of the front end of the sprayer.
8. The apparatus for ultra supercritical boiler furnace sootblowing according to claim 7, characterized in that: the outer diameter phi of the spray head is 63mm, and the wall thickness is 5 mm.
9. The apparatus for ultra supercritical boiler furnace sootblowing according to claim 8, characterized in that: the outer diameter of the nozzle is 22.5mm, and the inner diameter is 19.5 mm.
10. The device for ultra supercritical boiler furnace soot blowing according to claim 1 is characterized in that: and a wall box is arranged on the side wall of the hearth, and the soot blower spiral pipe is arranged in the wall box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120292959.2U CN215909073U (en) | 2021-02-02 | 2021-02-02 | Device for blowing ash to hearth of ultra-supercritical boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120292959.2U CN215909073U (en) | 2021-02-02 | 2021-02-02 | Device for blowing ash to hearth of ultra-supercritical boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215909073U true CN215909073U (en) | 2022-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120292959.2U Active CN215909073U (en) | 2021-02-02 | 2021-02-02 | Device for blowing ash to hearth of ultra-supercritical boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215909073U (en) |
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2021
- 2021-02-02 CN CN202120292959.2U patent/CN215909073U/en active Active
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