Methods for repairing a refractory wall of a high temperature process vessel utilizing viscous fibrous refractory material
View Patent ↗Systems and methods are provided whereby pumpable viscous fibrous material may be applied onto surfaces of high temperature process vessels while hot (i.e., while at or near such vessels' high operational temperatures of several hundreds up to several thousands of degrees Fahrenheit). More specifically, there are preferably provided a lance having a nozzle structure at a distal end thereof, and a pump system for pumping a pumpable fibrous refractory material to the nozzle. The lance has a length sufficient to allow it to be inserted into the high temperature process vessel so that the nozzle structure is adjacent an area in need of repair while an operator holds a proximal end thereof outside the vessel. In use, the lance is inserted into the process vessel while the process vessel is at or near its high operational temperature so that the nozzle structure is positioned adjacent to an area of the process vessel wall in need of repair, and so that the lance may be manipulated from outside the process vessel during repair of the wall thereof. Manipulating the lance from outside the process vessel will thereby cause the atomized spray of the fibrous material to contact the wall of the process vessel thereby repairing the same.
1. A method of repairing a fibrous refractory wall of a high temperature process vessel having an operational temperature of about 500° F. up to about 3000° F., comprising the steps of:
(a) providing a thermally protected lance having an atomizing tube in thermal communication therewith and a nozzle structure which includes a nozzle opening at a distal end of the lance, wherein the atomizing tube has a discharge opening which is proximally spaced from, but coaxially aligned with, the nozzle opening of the nozzle structure;
(b) inserting the a thermally protected lance into the process vessel while said process vessel is at or near its high operational temperature so that the nozzle opening of the nozzle structure at the distal end thereof is positioned adjacent to an area of the process vessel wall in need of repair, and so that the lance may be manipulated from outside the process vessel during repair of the wall thereof;
(c) pumping a fibrous refractory material having a viscosity of about 1,000 Poise or greater from a source thereof at the proximal end of the lance to the nozzle opening of the nozzle structure at the distal end of the lance;
(d) directing an atomizing gas through the atomizing tube so that the atomizing gas is discharged from the discharge opening thereof coaxially upstream of the nozzle opening and into the fibrous refractory material proximally of the nozzle opening to thereby cause the fibrous refractory material to be discharged from the nozzle opening of the nozzle structure in the form of an atomized spray; and
(e) manipulating the lance from outside the process vessel so as to cause the atomized spray of the fibrous material to contact the wall of the process vessel thereby repairing the same.
2. The method of claim 1 , which comprises circulating a liquid coolant through the lance within liquid inlet and discharge conduits.
3. The method of claim 2 , which comprises fixing the atomizing tube to a surface of one of said liquid inlet and discharge conduits.
4. The method of claim 2 , which comprises pumping the fibrous refractory material through a material supply tube positioned concentrically within said liquid inlet conduit, and positioning the atomizing tube within an annular space defined between said material supply tube and said liquid inlet conduit.
5. The method of claim 1 , which comprises directing the atomized spray of the material transversely relative to the lance.
6. The method of claim 5 , wherein the lance has an elongate axis, and wherein the nozzle opening of the nozzle structure is oriented transversely relative to the elongate axis, the method comprising positioning the discharge opening of the atomizing tube in coaxial alignment upstream of said nozzle opening so that said discharge opening is likewise oriented transversely relative to the elongate axis of the lance.
7. The method of claim 1 , which comprises directing the atomized spray of material coaxially relative to the lance.