Method of repairing hot refractory linings in high-temperature vessels
AssigneeAtlantic Richfield Company
InventorRichard M. Smirnoff
Life of this patent
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Abstract
A method of repairing damaged hot refractory linings in high-temperature vessels includes forming an opening through the outer shell of the vessel proximate to the damaged region of the hot refractory lining, and introducing a refractory material into the damaged region. The refractory material is rapidly injected in a sufficient amount to effect complete filling, and is fast curing to strength at the operating temperature of the vessel. The method eliminates the need to allow the vessel to cool down to ambient temperature and then reheat the vessel to operating temperature thereby eliminating thermal cycling of the refractory lining.
Claims15
A method of repairing a region of a refractory lining in a high-temperature vessel having a shell surrounding the refractory lining, the method comprising the steps of:
- a) forming a hole through the shell in communication with the region of the refractory lining;
- b) providing a phosphate bonded castable refractory material having a crush strength of at least about 5000 psi;
- c) injecting the refractory material through the hole and into the region;
- d) vibrating the refractory material during the step of injecting and after being injected into the region of the refractory lining, in order to enhance fluidization of the refractory material;
- and
- e) closing the hole.
A method of repairing a damaged region of a refractory lining in a rotary kiln having a shell surrounding the refractory lining, the method comprising the steps of:
- a) stopping rotation of the rotary kiln;
- b) forming from outside the rotary kiln a hole through the shell in communication with the damaged region of the hot refractory lining, the refractory lining being at an operating temperature of at least about 250.degree. F.;
- c) introducing through the hole and into the damaged region a phosphate bonded castable refractory material having a crush strength of at least about 5000 psi at the operating temperature, the refractory material being introduced at a rate of at least about 1 gal/min;
- d) vibrating the refractory material during the step of introducing and after the refractory material is introduced into the damaged region, in order to enhance fluidization of the refractory material;
- e) closing the hole;
- and
- f) re-starting rotation of the rotary kiln within less than about 15 min after the step of introducing.
A method of repairing a region of a refractory lining at a temperature of at least about 250.degree. F. in a high-temperature vessel, the method comprising the steps of:
- introducing into the region a refractory material having,
- (i) sufficient fluidity at about ambient temperature to be injected into the region;
- (ii) sufficient thermal stability to be heated from ambient temperature to the high temperature by injection into the vessel without explosive failure;
- and,
- (iii) a crush strength of at least about 5000 psi at the refractory lining temperature;
- providing an apparatus comprising a housing having a chamber and a plunger slidably received within the chamber;
- and,
- placing the refractory material into the chamber, positioning the chamber in communication with the region of the refractory lining, and sliding the plunger within the chamber to inject the refractory material into the region of the refractory lining.
A method of repairing a region of a refractory lining at a temperature of at least about 250.degree. F. in a high-temperature vessel, the method comprising the steps of:
- introducing into the region a refractory material having,
- (i) sufficient fluidity at about ambient temperature to be injected into the region;
- (ii) sufficient thermal stability to be heated from ambient temperature to the high temperature by injection into the vessel without explosive failure;
- and,
- (iii) a crush strength of at least about 5000 psi at the refractory lining temperature;
- providing an apparatus comprising a housing having a chamber and a plunger slidably received within the chamber;
- placing the refractory material into the chamber, positioning the chamber in communication with the region of the refractory lining, and sliding the plunger within the chamber to inject the refractory material into the region of the refractory lining;
- and,
- vibrating the refractory material (i) after being placed in the chamber, and (ii) as it is being injected into the region of the refractory lining.
Dependencies are inferred from the claim text.