Production of refractory linings or walls
AssigneeL'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation
InventorBernard Genies
Life of this patent
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Abstract
This invention relates to the production of refractory linings. According to the method, the lining formed by refractory materials is heated to a temperature sufficient to cause the sintering of the materials on at least an internal surface of the said lining. To provide this heating action, a flame is produced from a fuel gas and oxygen, within a partially closed volume close to the lining which is to be sintered, and a diluting gas is injected between the flame and the lining, at least during the first part of the rise in temperature. The method is applicable to the sintering of the linings of vessels utilized in metallurgy, in particular of induction furnaces.
Claims22
A method for the production of refractory linings, according to which said linings are formed from refractory lining material the sintering of which is at least partially performed by heating action, wherein, in order to provide said heating action, said method comprises the steps of
- placing said linings within an enclosure having a gas-passage opening and at least one other opening;
- passing through said gas-passage opening a mixture formed from fuel gas and oxygen to form a heating flame, with at least said one other opening serving to permit discharge of hot gasses resulting from combustion of said mixture;
- and
- injecting a diluting gas into said enclosure close to said flame during at least a first part of the sintering of the refractory material in such a manner as to increase the temperature of said linings to a sintering temperature in the range of 1500.degree. C. to 2000.degree. C.
A method for the production of refractory linings, according to which said linings are formed from refractory lining material the sintering of which is at least partially performed by heating action, wherein, in order to provide said heating action, said method comprises the steps of
- placing said linings within an enclosure having a gas-passage opening and at least one other opening;
- passing through said gas-passage opening a mixture formed from fuel gas and oxygen to form a heating flame, with at least said one other opening serving to permit discharge of hot gasses resulting from combustion of said mixture;
- and
- injecting a diluting gas into said enclosure close to said flame during at least a first part of the sintering of the refractory material in such a manner as to increase the temperature of said linings to a sintering temperature in the range of 1500.degree. C. to 2000.degree. C., wherein said injecting of the diluting gas ceases at a temperature of the order of 1000.degree. C. to 1200.degree. C.
A method for the production of refractory linings, according to which said linings are formed from refractory lining material the sintering of which is at least partially performed by heating action, wherein, in order to provide said heating action, said method comprises the steps of
- placing said linings within an enclosure having a gas-passage opening and at least one other opening;
- passing through said gas-passage opening a mixture formed from fuel gas and oxygen to form a heating flame, with at least said one other opening serving to permit discharge of hot gasses resulting from combustion of said mixture;
- injecting a diluting gas into said enclosure close to said flame during at least a first part of the sintering of the refractory material in such a manner as to increase the temperature of said linings to a sintering temperature in the range of 1500.degree. C. to 2000.degree. C.;
- and
- maintaining a temperature of the order 500.degree. C. for a temperature maintenance period of 1 to 2 hours after reducing the temperature from said sintering temperature.
A method for the production of refractory linings, according to which said linings are formed from refractory lining material the sintering of which is at least partially performed by heating action, wherein, in order to provide said heating action, said method comprises the steps of
- placing said linings within an enclosure having a gas-passage opening and at least one other opening;
- passing through said gas-passage opening a mixture formed from fuel gas and oxygen to form a heating flame, with at least said one other opening serving to permit discharge of hot gasses resulting from combustion of said mixture;
- and
- injecting a diluting gas into said enclosure close to said flame during at least a first part of the sintering of the refractory material in such a manner as to increase the temperature of said linings, wherein the increase of temperature of the linings is controlled to occur at a rate on the order of 100.degree. C./hour to 250.degree. C./hour, to a sintering temperature in the range of 1500.degree. C. to 2000.degree. C.
Apparatus for production of refractory linings in which the linings are formed from refractory lining material the sintering of which is at least partially performed by heating action, comprising shaping means for shaping said linings from said refractory material;
- enclosure means in which said refractory lining is placed and having a gas-passage opening and at least one other opening;
- with said gas-passage opening being provided with burner means, wherein said burner means includes a fuel gas and oxygen burner and means feeding a fuel gas and oxygen mixture thereto so that said burner forms a heating flame from said fuel gas and oxygen mixture, with said at least one other opening serving to permit discharge of hot gasses resulting from combustion of said mixture;
- and wherein said enclosure means further includes gas-injecting means for injecting a diluting gas, wherein said gas-injecting means injects said diluting gas into said enclosure close to said flame during at least an initial part of the sintering of the refractory material in such a manner as to permit the increase of the temperature of said linings to a sintering temperature in the range of 1500.degree. C. to 2000.degree. C., said gas-injecting means being coaxially arranged around said burner.
Apparatus for production of refractory linings in which the linings are formed from refractory lining material the sintering of which is at least partially performed by heating action, comprising shaping means for shaping said linings from said refractory material;
- enclosure means in which said refractory lining is placed and having a gas-passage opening and at least one other opening;
- with said gas-passage opening being provided with burner means, wherein said burner means includes a fuel gas and oxygen burner and means feeding a fuel gas and oxygen mixture thereto so that said burner forms a heating flame from said fuel gas and oxygn mixture, with said at least one other opening serving to permit discharge of hot gasses resulting from combustion of said mixture;
- and wherein said enclosure means further includes gas-injecting means for injecting a diluting gas, wherein said gas-injecting means injects said diluting gas into said enclosure close to said flame during at least an initial part of the sintering of the refractory material in such a manner as to permit the increase of the temperature of said linings to a sintering temperature in the range of 1500.degree. to 2000.degree. C.;
- wherein at least a part of said enclosure means forms structure for shaping said refractory linings.
Apparatus for production of refractory linings in which the linings are formed from refractory lining material the sintering of which is at least partially performed by heating action, comprising shaping means for shaping said linings from said refractory material;
- enclosure means in which said refractory lining is placed and having a gas-passage opening and at least one other opening;
- with said gas-passage opening being provided with burner means, wherein said burner means includes a fuel gas and oxygen burner and means feeding a fuel gas and oxygen mixture thereto so that said burner forms a heating flame from said fuel gas and oxygen mixture, with said at least one other opening serving to permit discharge of hot gasses resulting from combustion of said mixture;
- and wherein said enclosure means further includes gas-injecting means for injecting a diluting gas, wherein said gas-injecting means injects said diluting gas into said enclosure close to said flame during at least an initial part of the sintering of the refractory material in such a manner as to permit the increase of the temperature of said linings to a sintering temperature in the range of 1500.degree. C. to 2000.degree. C.;
- wherein said gas-injecting means includes a diluting gas feed duct having an outlet feeding the gas into said enclosure means and means imparting a whirling motion to the injected diluting gas.
Dependencies are inferred from the claim text.