A hydrogen-plasma rotary kiln furnace reactor and a method of reducing iron ore to iron using the same are disclosed. The hydrogen-plasma rotary kiln furnace includes a rotary kiln furnace and a hydrogen-plasma generator.

A raw meal delivery device for delivering raw meal into a gas line or a reactor of a system for producing cement clinker, having a connection line for connecting a raw meal line to the gas line or the reactor, an oblique raw meal chute arranged inside the connection line and via which raw meal passes from the raw meal line into the gas line or to the reactor, a baffle slide arranged at the foot of the raw meal chute and protruding into the path of the raw meal flowing via the raw meal chute and deflecting the incoming raw meal. A substantially convex displacement body is arranged on the baffle slide and lies in the path of the incoming raw meal and disperses the flow of raw meal. The displacement body disperses the raw meal on entry into the calciner with the effect of quicker calcination.

The present invention relates to a process and apparatus for improving the combustion of a secondary fuel supplied in a first stream in a rotary kiln, wherein the rotary kiln has a burner assembly comprising a main burner and a plurality of feed channels for various media, of which one is designed for the supply of a secondary fuel, in particular in the form of particles or shreds in a stream of compressed air. According to the invention, a tubular oxygen lance for an oxygen-rich gas, in particular, technical grade gaseous oxygen, or an oxygen-rich liquid, in particular, technical grade liquid oxygen, with an angled nozzle at its end, is arranged in or on a feed channel of the burner assembly, whereby the oxygen lance is brought into such a position that the oxygen emerging from a nozzle forms a second stream that strikes a first stream of secondary fuel. The present invention may be considered for new constructions of burner assemblies for rotary kilns, but mainly serves for retrofitting existing burner assemblies in which mostly feed channels are available as required for inserting an oxygen lance in the present invention. Targeted delivery of gaseous or liquid oxygen, or oxygen-enriched gas or liquefied gas to a secondary fuel can significantly improve the combustion process and consequently significantly reduce exhaust emissions, in particular, the emission of carbon monoxide.

To provide a fractionating device capable of stably fractionating powders such as cement raw materials by a simple configuration. A fractionating device 1 for fractionating some of a powder (cement raw material) R falling in a chute (main body) 2, wherein the fractionating device is equipped with a screw conveyor 5 which passes through the chute, a part of a casing 5a opening inside the chute, and receives part of the powder from an opening (inlet) 5b, and a collision separation member (collision separation rod) 4 which is provided above the screw conveyor in the chute and collides with an object when an object of a predetermined size or larger falls, and prevents the object from falling directly onto the screw conveyor. A rotation shaft 5d of the screw conveyor may be inclined from 5 to 20 with respect to the horizontal plane so that the end of the discharge port side of the screw conveyor is positioned above the other end and may be equipped with a guide member 3 that guides the powder falling in the chute in the direction of the opening of the screw conveyor.

A rotary kiln includes: a heating tube; a material feeding unit disposed on a first end of the heating tube; a material collection unit disposed on a second end of the heating tube; an inner cylinder supported at the second end of the heating tube with the inner cylinder being inserted in a central portion of the heating tube; a plurality of branch tubes disposed circumferentially on an outer circumferential surface of the inner cylinder, each of the branch tubes branching from the inner cylinder and extending in an axial direction along an inner circumferential surface of the heating tube; a hot air supply tube supported to be relatively rotatable with respect to the inner cylinder with the hot air supply tube being inserted in one end of the inner cylinder that extends outside the heating tube; and a drive mechanism that rotates the heating tube.

Providing a cement production apparatus in which raw material is supplied into a duct with being dispersed uniformly so that heat-exchanging efficiency is improved by even preheating and clogging and the like are prevented, so that stable operation can be carried out. Between cyclones at an upper stage and a cyclone at a lower stage disposed below cyclones at an upper stage, a duct 21 is provided to introduce exhaust gas to the cyclones at the upper stage with distributing after flowing upward from the cyclone at the lower stage; at a lower position than a distribution part 23 of the duct 21, a material-supplying pipe 22 is connected for supplying cement raw material; at a connected part of the material-supplying pipe 22 to the duct 21, a material-guiding chute 24 on which the cement raw material is supplied from the material-supplying pipe 22 and which drops it into the duct 21 is provided with protruding into the duct 21; and the material-guiding chute 24 is formed to have a flat upper surface and to be expandable by sliding so that insertion depth of a tip end 24a from an inner-wall surface 21b of the duct 21 is 0.15 to 0.5 times of an inner diameter of the duct 21.

To provide a cement production apparatus in which heat-exchanging efficiency can be improved by even pre-heating by supplying material equally to cyclones above a duct and which can perform an operation with low pressure loss and small energy consumption. A cement production apparatus includes: a duct 21 provided between upper cyclones 13A and a lower cyclone 13B being provided below the upper cyclones 13A, the duct 21 in which the exhaust gas drained from the lower cyclone 13B flows upward, distributing and introducing the exhaust gas to the upper cyclones 13A; a plurality of material-supplying pipes 22 for supplying cement raw material provided on the duct 21 below a distribution part 23 to the plurality of the upper cyclones 13A with a same number of distribution outlets 21a among the upper cyclones 13A; and connection ports 22a of the material-supplying pipes 22 to the duct 21 each provided at each of positions corresponding to swirl flows of the exhaust gas poured into the distribution outlets 21a.

A rotary kiln includes: a heating tube; a material feeding unit disposed on a first end of the heating tube; a material collection unit disposed on a second end of the heating tube; an inner cylinder supported at the second end of the heating tube with the inner cylinder being inserted in a central portion of the heating tube; a plurality of branch tubes disposed circumferentially on an outer circumferential surface of the inner cylinder, each of the branch tubes branching from the inner cylinder and extending in an axial direction along an inner circumferential surface of the heating tube; a hot air supply tube supported to be relatively rotatable with respect to the inner cylinder with the hot air supply tube being inserted in one end of the inner cylinder that extends outside the heating tube; and a drive mechanism that rotates the heating tube.

A thermal treatment reactor for feedstocks and method of use. The thermal treatment reactor comprises an infeed assembly, a furnace, a rotary drum, a discharge assembly, and a liberator assembly. The rotary drum may comprise forwarding flights, mixing flights, oscillating flights, and raking pins. The feedstock to be thermally treated enters the reactor through the infeed assembly. The feedstock is fed into the reactor in a controlled manner by means of a screw conveyor system. The thermally-treated product exits the reactor via the discharge assembly, which separates the thermally treated product into a VOC liberator, from whence the product enters into a cooling system to reduce the temperature for safe storage and handling.

Provided is a sintering furnace. The sintering furnace includes: a furnace body and a furnace head cover having a feed inlet, the furnace head cover covering a furnace head of the furnace body, the furnace head cover being axially limited relative to the furnace head, the furnace body being rotatable around a central axis relative to the furnace head cover, and the feed inlet being in communication with an interior of the furnace body; a sliding support structure including a first sliding structure configured to support the furnace head cover, the furnace head cover being fixedly connected to the first sliding structure, and the first sliding structure being slidably arranged in a length direction of the furnace body; and a feeding device in communication with the feed inlet through a flexible connection pipe.