Sootblower having a nozzle with deep reaching jets and edge cleaning jets
View Patent ↗A sootblower having a nozzle that includes one or more deep reaching jets aligned with its respective platen bank to clean slag deposits inset from the leading edge of the platen bank. The nozzle also includes one or more edge cleaning jets substantially angled with respect to the platen bank for cleaning the leading edges of the platen bank. For most applications, the major axis of the sootblower is perpendicular to the major axis of its respective platen bank, resulting in a sootblower with a nozzle having angled and perpendicular jets, referred to as angled-perpendicular nozzles. The jet sizes are selected to balance the opposing components of force perpendicular to the sootblower to avoid the imposition of torque on the lance.
1. An industrial boiler comprising a plurality of sootblowers, each sootblower having a major axis along a line of insertion and retraction defining an outward direction toward insertion and an inward direction toward retraction, each sootblower located adjacent to a leading edge of a respective platen bank in the boiler having a major axis, the sootblower comprising:
a nozzle; and
a lance tube for supplying a flow of pressurized fluid to the nozzle;
the nozzle comprising one or more deep reaching jets for emitting fluid aligned with the major axis of the platen bank for removing slag deposits inset from the leading edge of the platen bank;
the nozzle further comprising one or more edge cleaning jets for emitting fluid angled with respect to the major axis of the platen bank for removing slag deposits on the leading edge of the platen bank;
wherein the sootblower is configured such that, when a flow of pressurized fluid is applied to the nozzle, a perpendicular component of force imparted by the one or more edge cleaning jets is equalized with a perpendicular component of force imparted by the one or more deep reaching jets.
2. The industrial boiler of claim 1 , wherein for each sootblower:
the number of edge cleaning jets is one and the number of deep reaching jets is one;
the number of edge cleaning jets is one and the number of deep reaching jets is two; or
the number of edge cleaning jets is two and the number of deep reaching jets is two.
3. The industrial boiler of claim 1 , wherein for each sootblower the number of edge cleaning jets is one and the number of deep reaching jets is one, and wherein:
the edge cleaning jet is located outward of the deep reaching jet and directed outward;
the edge cleaning jet is located outward of the deep reaching jet and directed inward;
the edge cleaning jet is located inward of the deep reaching jet and directed outward; or
the edge cleaning jet is located inward of the deep reaching jet and directed inward.
4. The industrial boiler of claim 1 , wherein for each sootblower:
the number of edge cleaning jets is one;
the number of deep reaching jets is two;
the edge cleaning jet and a first deep reaching jet are located on a side of the nozzle; and
the second deep reaching jet is located on an opposing side of the nozzle.
5. The industrial boiler of claim 1 , wherein for each sootblower:
the number of edge cleaning jets is two;
the number of deep reaching jets is two;
the edge cleaning jets are located outward of the outward most deep reaching jet; and
the edge cleaning jets are directed outward; and
the deep reaching jets are located on an opposing side of the edge cleaning jets.
6. The industrial boiler of claim 1 , wherein for each sootblower at least one edge cleaning jets is directed approximately 50 degrees with respect to the major axis of the platen bank.
7. The industrial boiler of claim 1 , wherein for each sootblower at least one edge cleaning jet is directed within the range of approximately 30 degrees to approximately 80 degrees with respect to the major axis of the platen bank.
8. The industrial boiler of claim 1 , wherein for each sootblower the pressurized fluid comprises steam, air, or water.
9. The industrial boiler of claim 1 , wherein the one or more edge cleaning jets have larger diameters than the one or more deep reaching jets at the respective ends of the jets where the flow of pressurized fluid exits the jets.
10. A sootblower in or for an industrial boiler, the sootblower having a major axis along a line of insertion and retraction defining an outward direction toward insertion and an inward direction toward retraction, comprising:
a nozzle; and
a lance tube for supplying a flow of pressurized fluid to the nozzle;
the nozzle comprising one or more perpendicular jets for emitting fluid perpendicular to the major axis;
the nozzle further comprising one or more angled jets for emitting fluid angled with respect to perpendicular to the major axis of the sootblower;
wherein the sootblower is configured such that, when a flow of pressurized fluid is applied to the nozzle, a perpendicular component of force imparted by the one or more angled jets is equalized with a perpendicular component of force imparted by the one or more perpendicular jets.
11. The sootblower of claim 10 , wherein:
the number of angled jets is one and the number of perpendicular jets is one;
the number of angled jets is one and the number of perpendicular jets is two; or
the number of angled jets is two and the number of perpendicular jets is two.
12. The sootblower of claim 11 , wherein the one or more edge cleaning jets have larger diameters than the one or more deep reaching jets at the respective ends of the jets where the flow of pressurized fluid exits the jets.
13. The sootblower of claim 10 , wherein the number of angled jets is one and the number of perpendicular jets is one, and wherein:
the angled jet is located outward of the perpendicular jet and directed outward;
the angled jet is located outward of the perpendicular jet and directed inward;
the angled jet is located inward of the perpendicular jet and directed outward; or
the angled jet is located inward of the perpendicular jet and directed inward.
14. The sootblower of claim 10 , wherein:
the number of angled jets is one;
the number of perpendicular jets is two;
the angled jet and a first perpendicular jet are located on a side of the nozzle; and
the second perpendicular jet is located on an opposing side of the nozzle.
15. The sootblower of claim 10 , wherein:
the number of angled jets is two;
the number of perpendicular jets is two;
the angled jets are located outward of the outward most perpendicular jet; and
the angled jets are directed outward; and
the perpendicular jets are located on an opposing side of the angled jets.
16. The sootblower of claim 10 , wherein at least one angled jets is directed approximately 50 degrees with respect to perpendicular to the major axis of the sootblower.
17. The sootblower of claim 10 , wherein at least one angled jet is directed within the range of approximately 30 degrees to approximately 80 degrees with respect to perpendicular to the major axis of the sootblower.
18. The sootblower of claim 10 , wherein the pressurized fluid comprises steam, air, or water.
19. A method for cleaning an industrial boiler comprising a plurality of platen banks, each platen bank having a major axis, comprising the steps of:
installing a plurality of sootblowers in the boiler, each sootblower having a major axis along a line of insertion and retraction, each sootblower located adjacent to a leading edge of a respective platen bank;
configuring each sootblower with a nozzle and a lance tube for supplying a flow of pressurized fluid to the nozzle;
configuring each nozzle with one or more deep reaching jets for emitting fluid aligned with the major axis of its respective platen bank for removing slag deposits inset from the leading edge of the platen bank;
further configuring each nozzle with one or more edge cleaning jets for emitting fluid angled with respect to the major axis of its respective platen bank for removing slag deposits on the leading edge of the platen bank; and
for each sootblower, supplying pressurized fluid while inserting, rotating, and retracting the sootblower to remove slag deposits from its respective platen bank; and
for each sootblower, equalizing a perpendicular component of force imparted by the one or more edge cleaning jets with a perpendicular component of force imparted by the one or more deep reaching jets.
20. The method for cleaning an industrial boiler of claim 19 , wherein the equalizing is performed by:
manipulating the distance between the one or more deep reaching jets and the one or more edge cleaning jets;
manipulating the diameter of the lance tube;
manipulating the size of the one or more deep reaching jets; and/or
manipulating the size of the one or more edge cleaning jets.
21. The method for cleaning an industrial boiler of claim 19 , wherein manipulating the size of the one or more deep reaching jets and manipulating the size of the one or more edge cleaning jets comprises changing the throat diameter of the opening in the nozzle through which the fluid is discharged.