Method of treating a chamber having refractory walls
Method of treating a chamber having refractory walls, in which: a treatment composition, comprising at least one organosilicon compound and at least one hydrocarbide, is sprayed into said chamber, in the presence of oxygen; and said sprayed treatment composition is heated, the spraying in the presence of oxygen taking place in the closed chamber in which the treatment composition, in a predominantly liquid state, is atomized in the form of suspended particles, the method further including said at least one organosilicon compound decomposing to form a colloidal silica aerosol in the closed chamber, an overpressure being established therein, and a colloidal silica layer being spread over the refractory walls with, as a result of said overpressure, the colloidal silica penetrating into the microcracks.
1. A method for treating a chamber having refractory walls, comprising:
a spraying into said chamber, in the presence of oxygen, of a treatment composition comprising
at least one organosilicon compound forming a majority portion by weight of said composition and
at least one hydrocarbon capable, in the presence of oxygen, of giving rise, at a first temperature, to an exothermic reaction, and
a rise in temperature of said sprayed treatment composition to at least said first temperature,
characterized in that the spraying in the presence of oxygen takes place in the closed chamber where the treatment composition, in a predominantly liquid state, is atomized in the form of suspended particles,
and in that the method further comprises
during said exothermic reaction, a decomposition of said at least one organosilicon compound with formation of a colloidal silica aerosol in the closed chamber and the establishment of an overpressure therein, and
a spreading of a colloidal silica layer on the refractory walls of said chamber with, following said overpressure, penetration of the colloidal silica into the microcracks of the refractory walls.
2. The method as claimed in claim 1 , characterized in that it comprises, after said spreading, a rise in temperature of the chamber to a second temperature higher than the aforesaid first temperature and densification of said colloidal silica which has been spread in a layer on the refractory walls of the chamber and which has penetrated into said microcracks.
3. The method as claimed in claim 1 , characterized in that the refractory walls of the chamber separate said chamber from an external volume and in that the method further comprises, during said spraying into the closed chamber, a pressurizing of this external volume to a pressure lower than the pressure of the chamber having refractory walls which favors said penetration of colloidal silica into said microcracks.
4. The method as claimed in claim 3 , characterized in that said external volume consists of at least one combustion compartment and in that the method comprises, before said spraying, a pressurizing of said at least one combustion compartment to a pressure higher than that of the chamber having refractory walls and an inspection, therein, of a presence of brands issuing from said at least one combustion compartment via microcracks passing through said refractory walls.
5. The method as claimed in claim 1 , characterized in that said at least one organosilicon compound is at least partly soluble in said at least one hydrocarbon.
6. The method as claimed in claim 1 , characterized in that said at least one organosilicon compound is selected from the group consisting of silicones, siloxanes, organosilicates and siloxysilicates having a linear, cyclic or branched chain, substituted or unsubstituted, polymerized or unpolymerized, and the mixtures thereof.
7. The method as claimed in claim 1 , characterized in that said at least one organosilicon compound is substituted by at least one alkyl or aryl property of the group.
8. The method as claimed in claim 1 , characterized in that said at least one hydrocarbon is selected from aliphatic or aromatic hydrocarbons.
9. The method as claimed in claim 8 , characterized in that said at least one hydrocarbon is selected from the group consisting of hexane, cyclohexane, heptane, benzene, toluene, xylene and mixtures thereof.
10. The method as claimed in claim 1 , characterized in that said treatment composition further comprises at least one additive selected from the group consisting of talcum powder, lime, kaolinite, and silica fume.
11. The method as claimed in claim 1 , characterized in that the treatment composition comprises
a) 50 to 90% by weight of said at least one organosilicon compound,
b) 10 to 50% by weight of said at least one hydrocarbon, and
c) 0 to 20% by weight of at least one additive commonly used in the treatment of refractory substrates,
the sum of the percentages of a) to c) giving 100% by weight.
12. The method as claimed in claim 1 , characterized in that the treatment composition has a kinematic viscosity lower than or equal to 100 cSt (10 −4 m 2 ·s −1 ).