Abstract: The subject of the present invention is a method and a device for filling a distribution line (20) with corrosive gas. The said method is a method for filling with gas, with passivation, a line (20) for distributing corrosive gas, which line is intended to distribute the said corrosive gas to a system (3) located immediately downstream of the said line (20); the said method comprising: prior conditioning of the said line (20); the actual filling of the said line (20) with the said corrosive gas known as an active gas. Characteristically, the said actual filling with gas comprises: at least one cycle of filling the said line (20) with active gas as far as immediately upstream of the system (3) and of removing the said active gas thus introduced into the said line (20); the said removal being performed without the said active gas passing through the said system (3); followed by the final filling of the said line (20) with gas so as to make the said gas available to the said system (3).

Abstract: Combustion assembly adapted to be placed in a wall of a furnace including an axis having at least one pair of burners with axes, one oxidant lance arranged between the burners of the pair and having a lance axis and a source of oxidant connected to the burners and to the lance.

Abstract: Combustion assembly adapted to be placed in a wall of a furnace including an axis having at least one pair of burners with axes, one oxidant lance arranged between the burners of the pair and having a lance axis and a source of oxidant connected to the burners and to the lance.

Abstract: A combustion assembly adapted for a furnace is provided. The assembly includes an axis comprising at least one pair of burners having axes. An oxidant lance is arranged between the burners of the pair and has a lance axis. A source of oxidant is connected to the burners and to the lance. The combustion assembly can provide uniform heating of a charge of glass in a furnace.

Abstract: Method of heating the charge of a glass furnace in which at least one burner is placed in a wall of a furnace so as to heat the bath of glass, characterized in that at least one assembly consisting of a first and a second burner which are fed with fuel gas and with oxidizer gas containing at least 50 vol. % of oxygen is arranged in one of the walls of the furnace at a distance (D) at least equal to approximately 3 meters from each other, in that an oxygen lance is arranged between the first and second burners, the first burner, the second burner and the lance forming a combustion assembly and in that from approximately 30 vol. % to approximately 80 vol. % of oxidizer gas is sent into the lance and from approximately 20 vol. % to approximately 70 vol.

Abstract: An oxyburner (1) is associated with an opening (3) comprising a through passage (2) comprising a substantially cylindrical inlet region (5) receiving the downstream end of the oxyburner (1) and a substantially cylindrical outlet region (4) of a diameter D.sub.s and a length L.sub.s, the ratio D.sub.s /D.sub.e being comprised between 1.5 and 2.5 and the ratio L.sub.s /(D.sub.s -D.sub.e) comprised between 2 and 7. The speed of ejection of the oxygenated combustible gas is greater than 5 meters/second and the speed of ejection of the combustible gas is greater than the speed of the combustion-supporting gas.

Abstract: A process for the vitrification of products in the form of solid pieces or particles without the release of dust as a pollutant, according to which there is used a furnace (3) provided with a burner (15). There are introduced into the furnace the products to be vitrified, and the products are permitted to heat in the furnace until they form a liquid or pasty vitreous mass, then this vitreous mass is removed from the furnace and permitted to cool. The internal walls of the furnace are preheated with the burner to a temperature exceeding the temperature at which the products to be vitrified can form a liquid or pasty vitreous mass, then the energy supplied by the burner is reduced substantially or even cut off, before introducing waste into the furnace.

Abstract: A process for combustion in an industrial furnace (1), using at least one burner (2; 3) supplied with combustible (4) and combustion supporting (5) fluids. The flow rate of at least one of the fluids is pulsed at a frequency comprised between 0.1 and 3 Hz. There is provided in the furnace (1) at least one pair of two burners (2A, 2B; 3A, 3B) disposed substantially confronting each other; and the fluid of the burners of a pair is pulsed in offset phase from one burner to the other. The frequency of pulsation is between 0.1 and 1 Hz. The flow rates of fluids are substantially identical for each burner (2A, 2B; 3A, 3B) of the pair. The power of the pair of burners is greater than 300 KW.

Abstract: In a method of dry process fluxing at least one surface of a metallic article, the surface to be fluxed is treated with a plasma at atmospheric pressure of a gaseous mixture comprising hydrogen and optionally at least one inert gas. The invention also concerns an apparatus, particularly for practicing the process, as well as a process for soldering or plating.

Abstract: The thermal treatment atmosphere is obtained by catalytic reaction of an impure mixture of nitrogen, advantageously obtained by permeation or adsorption, and hydrocarbon, the catalytic reaction being carried out at a temperature between 400.degree. and 900.degree. C., typically between 500.degree. and 800.degree. C., with a noble metal base catalyst, typically platinum or palladium on alumina support. The reaction may be carried out in a reactor placed inside or outside the furnace.

Abstract: Substantially all residual oxidizing gas in a treating atmosphere which is inert or reducing, is eliminated by injecting into the atmosphere a gaseous silicon hydride at a temperature between 50 and 1,600.degree. C. and in amount such that the ratio R of the content of hydride to the content of oxidizing gas to be eliminated is within the range of 1.5 to 20. The rapid action of the trace amounts of hydride injected enables one to control with precision heat treatment processes by maintaining the residual oxidizing gas contents below predetermined very low thresholds.

Abstract: Process for heat treating articles by hardening them in a recirculating gas medium which is in contact with the treated articles, the hardening gas being cooled by means of a heat exchanger, of the type in which helium is used as hardening gas, and is stored under holding pressure in a buffer container, wherein at the end of a hardening operation, a helium load is extracted from the treatment enclosure, in final phase by means of pump until a primary vacuum is obtained, the extracted helium is brought to purifying pressure by means of a compressor associated to a mechanical filter, and the helium under purifying pressure is sent to a purifier in which impurities are removed, after which it is transferred, if desired, after recompression in the buffer container.

Abstract: Heat treating metals by continuous longitudinal passage of metallic pieces in an elongated treating zone under controlled atmosphere having a high temperature upstream end where the controlled atmosphere comprises nitrogen and reducing chemical substances, such as hydrogen, possibly carbon monoxide, and a downstream cooling end under an atmosphere essentially formed by introducing nitrogen. In the high temperature upstream end, the nitrogen which constitutes the atmosphere is supplied by introducing nitrogen with a residual oxygen content not exceeding 5%, the reducing chemical substances being present at any moment in amounts at least sufficient to eliminate oxygen introduced with nitrogen. The nitrogen introduced in the downstream cooling end is substantially free of oxygen. Application of the process to the annealing of metallic pieces.

Abstract: Process for thermal treatment of metals by passage of metallic pieces into an elongated zone under a controlled atmosphere, having an upstream section at an elevated temperature, where the controlled atmosphere comprises nitrogen and reductive chemicals, particularly hydrogen, possibly carbon monoxide; and a downstream section at a lower temperature under a controlled atmosphere. The invention is characterized by the fact that in the upstream section at an elevated temperature, the atmosphere comprises nitrogen having a residual content of oxygen between 0.5% and 5% produced by separation of air using permeation or adsorption techniques. The reductive chemicals are present at all times in a content at least sufficient to eliminate the oxygen admitted with the nitrogen.

Abstract: Process for the heat treatment of low-alloy steels at temperatures higher than 600.degree. C., such as annealing or heating before hardening, etc., said treatment being carried out in a protection atmosphere produced by the injection of nitrogen, hydrocarbon C.sub.x H.sub.y and optionally hydrogen, with a control of the atmosphere. According to the invention, the composition of the residual species CH.sub.4, CO, H.sub.2 O, and the temperature of the gaseous mixture in the furnace are controlled in order to control the carburization and the decarburization of the treated steels.