Invention relates to a vertical ring shaft kiln comprising a vertical burning region (1); an intermediate sintering zone (Z.sub.3) surrounded by a first wall (10) and an opposite second wall (20) at the burning region (1) to obtain a clinker from a particulate raw material flowing downwards direction.

The present invention relates to apparatus for thermal treatment of a mineral starting material, wherein the apparatus comprises a calciner, wherein the calciner comprises at least a first calciner section and a second calciner section, wherein the first calciner section is arranged vertically, wherein the second calciner section is arranged at an incline, wherein the second calciner section has an angle ? between the horizontal and the flow direction of the second calciner section, wherein the angle ? is between 20? and 80?, wherein the first calciner section has a first hydraulic diameter d.sub.h,1, wherein the second calciner section has a second hydraulic diameter d.sub.h,2, wherein the second hydraulic diameter d.sub.h,2 is less than or equal to the first hydraulic diameter d.sub.h,1 multiplied by the sine of the angle ?.

The invention relates to a device (30) for the extraction and the transfer of granular mineral materials at high temperature contained in a first enclosure including a fixed upper part (32) and a mobile lower part (34) delimiting a duct (36), the mobile lower part (34) being movable in a determined direction (50) between a advanced position and a retracted position, and vice versa, to allow the flow of the granular mineral materials in the duct (36). The device further includes means (78, 80) for moving and guiding the mobile part (34) relative to the fixed part (32). The fixed part (32) and the mobile part (34) each comprise a metal outer shell (38, 58), and an inner shell (40; 60) made by stacking at least a first coating (42; 62) of thermally insulating material mounted on the metal outer shell (38; 58), and a second coating (44; 64) of refractory material mounted on the first coating (42, 62).

The invention relates to a device (30) for the extraction and the transfer of granular mineral materials at high temperature contained in a first enclosure including a fixed upper part (32) and a mobile lower part (34) delimiting a duct (36), the mobile lower part (34) being movable in a determined direction (50) between a advanced position and a retracted position, and vice versa, to allow the flow of the granular mineral materials in the duct (36). The device further includes means (78, 80) for moving and guiding the mobile part (34) relative to the fixed part (32). The fixed part (32) and the mobile part (34) each comprise a metal outer shell (38, 58), and an inner shell (40; 60) made by stacking at least a first coating (42; 62) of thermally insulating material mounted on the metal outer shell (38; 58), and a second coating (44; 64) of refractory material mounted on the first coating (42, 62).

A method for burning material, such as carbonate rocks, in a parallel-flow regenerative shaft kiln having two shafts which are operated alternately as a burning shaft and as a regenerative shaft and are connected to one another by means of a connecting channel, wherein the material flows through a material inlet into a preheating zone for preheating the material, a burning zone for burning the material and a cooling zone for cooling the material to a material outlet, wherein a cooling gas is admitted into the cooling zone, wherein exhaust gas is discharged from one of the shafts via an exhaust gas outlet, wherein the exhaust gas discharged from the shaft via the exhaust gas outlet is at least partially introduced into at least one of the shafts.

The present invention relates to device for heat-treating solid material, in particular in granular form, wherein the device comprises a kiln and an external heat source, wherein said device comprises at least two steps arranged above each other, wherein each step comprises a gas permeable sloped sliding surface on which a bed of said solid material slides down within said device due to gravity and wherein said sloped sliding surfaces of said steps directly consecutive to each other slope in opposite directions, wherein the kiln comprises at least one, preferably at least two, of said steps and the kiln is configured such that a hot gas generated by the external heat source is led through said solid material inside the kiln to heat said solid material to a desired temperature in order to change the substance properties of said solid material. According to the invention, said device comprises at least one gas temperature adjustment system comprising a gas outlet in a second step of said steps, a temperature adjustment zone and a gas inlet in a first step of said steps, preferably the first step being arranged directly consecutive and above the second step, wherein at least the first step is one of said at least one step inside the kiln and wherein said gas temperature adjustment system is adapted such that hot gas is extracted from said second step through the gas outlet, directed into the temperature adjustment zone where a hot gas temperature is adjusted to an adjusted temperature by the external heat source and reintroduced into said first step at said adjusted temperature. The invention further relates to a method for producing supplementary cementitious materials.

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.

High temperature furnaces, calcining, pyrolysis and other high temperature manufacturing processes, composition rearrangements, and equipment. Systems, equipment and processes using oxyfuel combustion using gaseous fuels for cement manufacture. Reactor furnaces using oxyfuel containing natural gas and gravity feed to process pellets forming a pellet bed into cement.

Numerous examples of a vertical kiln for manufacturing cement are disclosed. In one example, a vertical kiln comprises a housing comprising a top opening to receive unprocessed material and a bottom opening to output processed material; a combustion system to heat the unprocessed material within the housing to generate the processed material; a thermocouple located within the housing to measure temperature; and a control system to control the combustion system in response to temperature data from the thermocouple.

The present invention relates to a device for heat-treating solid material, in particular in granular form, wherein the device comprises a kiln and an external heat generator, wherein said kiln comprises at least one sloped sliding surface on which a bed of said solid material slides down within said kiln due to gravity while a hot gas generated by the external heat generator is led through said solid material to heat said solid material to a desired temperature in order to change the substance properties of said solid material. According to the invention, said external heat generator for generating said hot gas is external to said kiln, wherein said kiln further comprises at least one kiln gas inlet through which said hot gas enters said kiln, such that the necessary temperature of said hot gas can be controlled precisely in that said hot gas is generated in said external heat generator, ensuring that the solid material does not experience temperatures above an allowed maximum temperature, and further such that the solid material is not exposed to radiation from a burner.