A device for cooling the opening of a rotary kiln via cool air-blowing, the kiln including a metal cylinder lined internally with a refractory material and being rotatably mounted relative to the frame of the kiln, into which materials are intended to be inserted and fired. The cooling device includes: the aforementioned cylinder and a metal cylinder end part covered with a refractory material and secured to the cylinder; two concentric metal casings, known as the inner and outer casing, which surround the cylinder of the kiln and form two annular channels; and ventilation elements that allow cool air to flow through the annular channels. The device includes: an annular distribution chamber which surrounds the cylinder, is secured thereto and supplies the first channel with air; ventilation elements including at least one fan and an electric motor actuating the fan, and supplying the distribution chamber in an air-tight manner.

The present invention provides a fluidized calciner which can perform sufficient calcination by reducing a rate of unburned fuel at an outlet of the fluidized calciner while preventing occlusion in a preheater. In the present invention, plural pulverized coal blowing lines (3), raw material chute (4) of cement raw material, and first to fourth air introduction pipes (5a to 5d) are connected to a bottom side wall of a tubular furnace body (2) whose upper end portion is closed by a top plate (2b); a fluidizing air blowing port (2a) adapted to blow in fluidizing air is disposed at a bottom of the furnace body (2); an exhaust gas duct (6) is connected to a top side wall of the furnace body located above the first and/or second air introduction pipes (5a, 5b) by being spaced away from the top plate (2b); and blowing ports (3a) of the pulverized coal blowing lines are disposed below suction ports of respective air introduction pipes (5a to 5d) but above the fluidizing air blowing port (2a), and at least one of the blowing ports (3a) is placed below the third or fourth air introduction pipe (5c or 5d).

The present invention discloses a cooler for cooling particulate material which has been subjected to heat treatment in an industrial kiln, such as a rotary kiln for manufacturing cement clinker. This cooler comprises an inlet, an outlet, end wall, side walls, a bottom and a ceiling, at least three reciprocating supporting lanes for receiving, supporting and transporting the material to be cooled, the lanes are moving following the walking floor principles as well as means for injecting cooling gas into the material through grate plates in the lanes. With the present invention it is an aim to have an increase in the vertical shearing height, and still having stationary clinker on top of the grate plates.

A plant for the treatment and recovery of white slag resulting from steelmaking processes. The plant including at least one basic frame; at least one work chamber, movable in rotation around a relevant axis and configured to receive and treat the white slag, the latter being moved forward along at least one direction of treatment. The work chamber including at least one loading portion through which said white slag is loaded; at least one cooling portion arranged downstream of said loading portion and comprising at least one treatment channel of said white slag; and cooling device/structure/component/or the like comprising at least one coolant to cool said white slag to obtain at least one recovery powder; and at least one sorting and separation portion of the recovery powder arranged.

A cement production plant may include a preheater for preheating raw meal, a calciner for calcining the preheated raw meal, and a furnace with a furnace burner for firing the raw meal to form cement clinker. The furnace has a combustion gas inlet for admitting a combustion gas with an oxygen content of 30% to 75% into the furnace. The cement production plant may also include a cooler for cooling the cement clinker. The calciner and the furnace each have at least one respective fuel inlet for admitting at least one fuel into the calciner and the furnace. The calciner and the furnace each have at least one respective inert gas inlet for respectively admitting inert gas into the calciner and the furnace.

A multitubular rotary heat exchanger has a stationary shielding unit. The shielding unit is positioned in close proximity to a tube plate outside a heating or cooling region. A stationary surface of the shielding unit is positioned in opposition to and in close proximity to an end opening of a heat transfer tube moving in an upper zone of the heating or cooling region, thereby transiently reducing or restricting the flow rate of the thermal medium fluid flowing through the heat transfer tube moving in the upper zone.

A cooler for cooling bulk material such as cement clinker may include a stationary aeration grate that is for receiving the bulk material is passably by a flow of cooling gas, a conveyor unit having conveyor planks that are disposed above the aeration grate and that for transporting the bulk material are movable in a reciprocating manner in a conveying direction and counter to the conveying direction, a seal assembly that prevents grate riddlings and is attached to the stationary aeration grate, and a drive element that drives the conveyor planks and extends through the stationary aeration grate. The seal assembly may lie against the drive element, and spacing between the seal assembly and the drive element may be adjustable. Further, a method for preventing grate riddlings in a cooler may involve in the event of wear decreasing the spacing between the seal assembly and the drive element.

Processes and plants for producing cement clinker, in which an oxygen-containing gas having a proportion of 15% by volume or less of nitrogen and a proportion of 50% by volume or more of oxygen is conveyed from a first section of the cooler directly adjoining the top of the furnace into the rotary furnace and is optionally additionally conveyed to the calciner, and where the total gas streams fed in to the combustion processes consist to an extent of more than 50% by volume (preferably more than 85% by volume) of oxygen.

This application discloses exemplary processes and systems for reducing mineral ring accumulation in calcination kiln. The processes and systems comprise inserting non-condensable gases (“NCGs”) in a preheating zone of a calcination kiln, upstream of the burner end. The pre-heating zone may be characterized by temperatures ranging from 1,300° F. to 1,750° F. The system may desirably comprise a plenum for inserting the NCGs into the rotating calcination kiln at the pre-heating zone.

This application discloses exemplary processes and systems for reducing mineral ring accumulation in calcination kiln. The processes and systems comprise inserting non-condensable gases (“NCGs”) in a preheating zone of a calcination kiln, upstream of the burner end. The pre-heating zone may be characterized by temperatures ranging from 1,300° F. to 1,750° F. The system may desirably comprise a plenum for inserting the NCGs into the rotating calcination kiln at the pre-heating zone.