Blaster nozzle
A novel blaster nozzle used for assisting in the pneumatic removal of cloggings and cakings during the transport of particulate matter through an enclosure housing is set such that it can be removed and replaced from outside the enclosure housing. The blaster nozzle includes a nozzle head having an orifice for the conduction of high-pressure fluid, wherein the nozzle head is composed of a refractory concrete having from about 4-20% by volume metal fibers therein. The blaster nozzle also includes a flange member connected to the nozzle head and a connection tube extends from the flange member for connecting the blaster nozzle to an air cannon.
1. A method of installing a blaster nozzle in a refractory lined enclosure housing, the blaster nozzle being effective to assist in the pneumatic removal of cloggings and/or cakings during the transport of particulate matter through the enclosure housing, the method comprising:
(a) providing, outside an outer shell of the enclosure housing, the blaster nozzle, the blaster nozzle comprising a nozzle head, a flange member and a connection tube, the flange member being connected to the nozzle head, the connection tube extending from the flange member for connecting the blaster nozzle to an air cannon, the nozzle head comprising a refractory concrete having about 4-20% by volume metal fibers therein, the nozzle head having an inner surface which defines a passageway extending from adjacent the flange member for conduction of, and contact with, high-pressure air, the nozzle head having an orifice at a distal end of the passageway where high-pressure air is expellable from the blaster nozzle, at least a majority of said inner surface being said refractory concrete, the nozzle head having an outer surface of said refractory concrete, the orifice, including the inner and outer surfaces thereof, being made entirely of said refractory concrete, the enclosure housing, including the outer shell thereof, having a hole sized to accommodate the blaster nozzle;
(b) from outside the outer shell and through the hole in the outer shell, installing the blaster nozzle into the hole; and
(c) attaching the flange member to the outer shell.
2. The method of claim 1 , further comprising connecting the connection tube to the air cannon.
3. The method of claim 1 , wherein the flange member is attached to the outer shell by welding.
4. The method of claim 1 , wherein the outer shell is metal.
5. The method of claim 1 , further comprising installing a filler to fill a gap between the outer surface of the nozzle head and an inner surface of the hole.
6. The method of claim 1 , wherein the blaster nozzle is installed into the hole by inserting the blaster nozzle into the hole orifice-end first.
7. The method of claim 1 , wherein the enclosure housing is selected from the group consisting of hoppers, funnels, silos, enclosed conveyors, and rotary kilns.
8. The method of claim 1 , wherein the enclosure housing is an enclosure housing in a cement production process.
9. The method of claim 1 , wherein the enclosure housing is a rotary kiln.
10. The method of claim 1 , wherein the enclosure housing is a rotary kiln for cement production.
11. The method of claim 1 , wherein the nozzle head is effective to operate in an environment having temperatures in excess of 2000° F.
12. The method of claim 1 , wherein the nozzle head is effective to withstand temperatures of up to 1620° C.
13. The method of claim 1 , further comprising, prior to step (b), removing a different blaster nozzle from the enclosure housing to provide the hole.
14. The method of claim 13 , wherein the different blaster nozzle is removed from outside the outer shell by passing an orifice-end of the different blaster nozzle through the hole in the outer shell.
15. The method of claim 1 , wherein the nozzle head is cylindrical.
16. The method of claim 1 , wherein the flange member is connected to the nozzle head by means comprising fasteners cast into the nozzle head.
17. The method of claim 1 , wherein the orifice is a slotted orifice.