A cleaning device that can properly and efficiently clean a place such as a coke oven top part where an obstacle is present, can perform cleaning irrespective of whether or not a coal charging car is operating, and has a simple and compact structure and a method for cleaning an oven top of a coke oven. The cleaning device travels on a road surface and collects an accumulated substance accumulated on the road surface and includes a travelling trolley, a collector provided on a front face part of the travelling trolley that collects the accumulated substance accumulated on the road surface in front of the travelling trolley as the travelling trolley travels forward, and a sweeper provided on the travelling trolley and that sweeps the accumulated substance accumulated on the road surface beside the travelling trolley toward a position in front of the travelling trolley.

A cleaning device that can properly and efficiently clean a place such as a coke oven top part where an obstacle is present, can perform cleaning irrespective of whether or not a coal charging car is operating, and has a simple and compact structure and a method for cleaning an oven top of a coke oven. The cleaning device travels on a road surface and collects an accumulated substance accumulated on the road surface and includes a travelling trolley, a collector provided on a front face part of the travelling trolley that collects the accumulated substance accumulated on the road surface in front of the travelling trolley as the travelling trolley travels forward, and a sweeper provided on the travelling trolley and that sweeps the accumulated substance accumulated on the road surface beside the travelling trolley toward a position in front of the travelling trolley.

A heat treatment system disclosed herein may include: one or more saggars, each of which is configured to accommodate powder of a lithium positive electrode material; and a heat treatment furnace configured to heat-treat the powder accommodated in the one or more saggars.

Each of the one or more saggars may include a contact surface which is to make contact with the powder, wherein at least the contact surface of each saggar is constituted of a nickel-based alloy. The heat treatment furnace may be configured to heat-treat the powder accommodated in the one or more saggars at a temperature of 300° C. or more and 1000° C. or less for a duration of 10 hours or more and 30 hours or less.

A heat treatment system disclosed herein may include: one or more saggars, each of which is configured to accommodate powder of a lithium positive electrode material; and a heat treatment furnace configured to heat-treat the powder accommodated in the one or more saggars.

Each of the one or more saggars may include a contact surface which is to make contact with the powder, wherein at least the contact surface of each saggar is constituted of a nickel-based alloy. The heat treatment furnace may be configured to heat-treat the powder accommodated in the one or more saggars at a temperature of 300° C. or more and 1000° C. or less for a duration of 10 hours or more and 30 hours or less.

A slag door arrangement (10) for a metallurgical furnace (1) includes a furnace vessel (2) with a slag tunnel (8) having a rectangular opening cross section extending laterally through the furnace vessel (2). A pivoting movement of the slag door about a horizontal pivoting axis and a lifting movement of the slag door in a direction perpendicular to the horizontal pivoting axis are independent of each other. A method for cleaning a slag opening of such a metallurgical furnace (1) includes pivoting the slag door to perform a cleaning movement from a position of the slag door in the slag tunnel near the interior of the furnace towards the outside of the furnace out of the slag tunnel at controllably different distances (clearances) from the bottom of the slag opening or of the slag tunnel.

The invention relates to method and to an arrangement for removing outgrowth in a suspension smelting furnace. The suspension smelting furnace comprising a reaction shaft having a reaction shaft structure. The reaction shaft comprises at least one opening for an outgrowth removal means. The movable piston is arranged such that the movable piston can move in the opening in the reaction shaft and into the reaction shaft to push possible outgrowth in the reaction shaft.

The invention relates to method and to an arrangement for removing outgrowth in a suspension smelting furnace. The suspension smelting furnace comprising a reaction shaft having a reaction shaft structure. The reaction shaft comprises at least one opening for an outgrowth removal means. The movable piston is arranged such that the movable piston can move in the opening in the reaction shaft and into the reaction shaft to push possible outgrowth in the reaction shaft.

A machine for cleaning regeneration chambers of furnaces, the regeneration chambers having stacks of hollow refractory elements delimiting vertical passages, which define chimneys includes a self-propelled support structure to be introduced into a compartment, below the regeneration chamber to be cleaned, which communicates with the regeneration chamber. The machine further includes at least one lance, applied to the self-propelled support structure and configured to send within the vertical passages a stream of cleaning material powder and compressed air generated by a compressor positioned outside of the regeneration chamber to be cleaned, and at least one suction mouth, applied to said support structure and configured to suck cleaning material dust and aspirable materials from the ground, which were removed during the cleaning operation. At least one video camera is mounted on the support structure and at least one monitor controls from outside, through the video camera, operation of the machine.

A system, method, and apparatus for cleaning deposits in industrial furnaces. An improved fan jet nozzle for air cannon includes either a 4″ or a 6″ inner diameter circular inlet. The nozzle includes a flattening of the inlet on opposed top and bottom side walls converging towards an outlet of the nozzle. The opposed top and bottom sidewalls have convex surface protruding towards the throat of the nozzle. Lateral sidewalls converge towards the outlet of the nozzle. The lateral sidewalls have a slightly concave curvature protruding outwardly from the interior of the nozzle. The outlet may have an arcuate indentation proximal to a centerline of the lateral sidewalls. The improved performance in face area, planar are, and penetration depth permits employment of half the air cannons in an industrial furnace for cleaning while improving cleaning efficiency in the width and depth of cleaning.

Direct reduction process and plant for producing DRI comprising a reduction reactor and at least one reducing gas heater typically comprising a convective heating section and a radiant heating section for raising the reducing gas temperature to a level adequate for iron oxides reduction to metallic iron, typically above 850° C., wherein the reducing gas fed to the reduction reactor comprises a stream of reducing gas recycled from the reduction reactor and a make-up stream of coke oven gas containing carbon compounds which may form carbon deposits in the heating path of said heater, namely BTX and other complex carbon compounds. The heater is provided with means for feeding oxidizing agents, for example steam, steam and air and/or oxygen at predetermined heating tubes successively for eliminating the carbon deposits which may form inside the heating tubes of said heater without interrupting the operation of the plant. The make-up stream of cold COG can be combined with the recycled gas at a point in the gas heating path of the heater where the tubes have a skin wall temperature of at least 700° C., or when the mixture of recycled gas and COG is at a temperature above 700° C. for minimizing clogging or fouling of heating equipment.