Abstract: A blast furnace for ironmaking production wherein iron ore is at least partly reduced by a reducing gas which is injected in the stack of the blast furnace. The blast furnace includes an external wall, an internal wall in contact with matters charged into the blast furnace, the internal wall including several rows of staves having a parallelepipedal shape. At least one row of staves comprises staves with a hole drilled in a least one of the corners of the parallelepipedal stave wherein an injection device may be partly inserted in.

Abstract: A blast furnace for ironmaking production wherein iron ore is at least partly reduced by a reducing gas which is injected in the stack of the blast furnace. The blast furnace includes an external and an internal wall, having a thickness Tint, in contact with matters charged into the blast furnace. The thickness Tint of the internal wall is substantially constant above and below the injection area of a reducing gas.

Abstract: A device to inject a reducing gas into a shaft furnace includes an external casing whose front face is provided with an outlet for gas injection into the shaft furnace, an internal casing located inside the external casing wherein reducing gas is circulating. The internal casing has an opening matching the gas injection outlet of the front face of the external casing. The front face of the external casing includes an upper and a lower part and the gas injection outlet is in the lower part and inwards from the upper part.

Abstract: A device to inject a reducing gas into a shaft furnace including an external casing whose front face is provided with an outlet for gas injection into the shaft furnace, an internal casing located inside the external casing and made of a steel able to resist to a temperature up to 1200° C., this internal casing having an opening matching the gas injection outlet of the front face of the external casing and a refractory layer located between the external casing and the internal casing.

Abstract: A blast furnace for ironmaking production wherein iron ore is at least partly reduced by a reducing gas which is injected in the stack of the blast furnace in an injection zone, the blast furnace comprising an external wall and an internal wall in contact with matters charged into the blast furnace, wherein in the injection zone the internal wall comprises local inwards enlargements and the reducing gas injections are performed below said inwards enlargements.

Abstract: A method of determination of deformation along a first direction of an equipment (1) in contact with hot material and including an inner face (3) in contact with the hot material and an outer face (4) opposite to the inner face (3) is provided. An equipment (1) in contact with hot material provided with means to determine its deformation along a first direction is also provided.

Abstract: A method of determination of deformation along a first direction of an equipment (1) in contact with hot material and including an inner face (3) in contact with the hot material and an outer face (4) opposite to the inner face (3) is provided. An equipment (1) in contact with hot material provided with means to determine its deformation along a first direction is also provided.

Abstract: A process for recycling blast furnace gas is provided. At least one portion of the gases resulting from the blast furnace undergo a CO2 purification step to create a CO-rich gas which is reinjected at a first top injection point at a temperature between 700° C. and 1000° C. through a top injection line, and at a second bottom injection point at a temperature between 1000° C. and 1300° C. through a bottom injection line. The gases from the bottom and top injection lines are heated at a temperature between 1000° C. and 1300° C. A portion of the CO-rich gas exiting the purification step is directly introduced into the top injection line via a cold gas injection line to obtain a temperature between 700° C. and 1000° C. at the first top injection point. The gas that flows through the bottom and top injection points controlled upstream of the system of the heaters. A device is also provided.

Abstract: The invention mainly relates to a process for recycling blast furnace gas in which at least one portion of the gases resulting from the blast furnace undergo a CO2 purification step so as to create a CO-rich gas which is reinjected at a first top injection point located above the base of the blast furnace at a temperature between 700° C. and 1000° C. through a top injection line, and at a second bottom injection point at the base of the blast furnace at a temperature between 1000° C. and 1300° C. through a bottom injection line, in which the gases from the bottom and top injection lines are heated by means of heaters from which the gases emerge at a temperature between 1000° C. and 1300° C. The process of the invention is essentially characterized in that a portion of the CO-rich gas (18) exiting the purification step is directly introduced into the top injection line (21) via a cold gas injection line (35) in order to obtain a temperature between 700° C. and 1000° C.