Abstract: A method of producing cement clinker including the steps of preheating raw meal comprising calcium carbonate in a preheating stage that is preheated by the exhaust gases of a sintering stage connected downstream in the direction of the gas flow, neutralizing the preheated raw meal, sintering the raw meal into cement clinker in a sintering stage, and cooling the cement clinker from the sintering stage in a cooling stage that cools the cement clinker with a gas. The exhaust gases of the sintering stage are combined with the exhaust gases of the neutralization, and the combined exhaust gases are conducted in an open gas circuit. The CO2 emissions are substantially reduced over known systems with CO separation, and the formation of nitrogen oxides by the combustion of atmospheric nitrogen in the oxidative environment of the sintering stage burner is almost completely prevented.

Abstract: In order to create a roller press, particularly for comminuting a bed of material, the roller press having two rollers separated from each other by a roller nip and using hydraulic cylinders to press the one roller against the oppositely situated roller over the material situated in the roller nip, the stress on the surface of the rollers to be reduced and their service life to be increased, it is proposed according to the invention that both rollers are designed as loose rollers that are displaceable transversely relative to the roller nip, the bearing housings of the rollers being supported on side parts of the machine frame by hydraulic cylinders that apply the roller compaction pressure.

Abstract: A roll press for the compression or compacting of granular products. Two detachable rolls separated by a roll gap are driven in opposite directions and mounted on shafts to rotate in a machine frame. The shafts of the mobile rolls are received in bearing housings arranged in a mobile manner in the machine frame. Two respective bearing housings of different rolls, arranged on one side of the rolls, are interconnected by at least one pressure cylinder having at least two working chambers. A method for centering mobile rolls in such a roll press. The at least two working chambers have a force effect acting in opposite directions, and are interconnected in such a way that a pressure medium can circulate between the chambers. In this way, the hydraulic system is positioned in a fixed manner on the machine frame, the rolls nonetheless being mounted in the machine frame in a floating manner.

Abstract: A grinding roller comprising hard bodies embedded in the surface for fixing a material bed. The hard bodies are received in a sleeve respectively and are embedded in the surface. As a result, the sleeves can be removed more easily from the surface after use and wear of the grinding roller for restoring the surface.

Abstract: A grinding roller for the high-pressure comminution of granular milling material, having a reinforcement with hard bodies which protrude from the surface of the main part of the grinding roller. At least some of the hard bodies have a continuous recess, wherein the recess extends in the radial direction of the grinding roller. Refurbishing the surface of the grinding roller is substantially simplified by the continuous recess.

Abstract: A method for regulating the roll gap pressure of a roller press and a corresponding roller press. The roll gap pressure is regulated dependent on at least one oscillating movement that is measured on the roller press. This has the advantage that the roller press can always be operated at the maximum roller press efficiency without the roller press reaching the overload range.

Abstract: A closing element for a machine frame of a rolling press, that sits on the end of a frame element as a hasp. The closing element includes and element enabling a pendular motion on the frame element. In this way, a floating mounting of the closing element is achieved. This enables a very fast dismounting that facilitates the replacement of the rolls, and leads to an optimum arrangement of the closing elements on corresponding end pieces of the machine frame.

Abstract: A rotary kiln burner particularly for fine-grained solid fuels such as coal dust, with jet air nozzles which can be adjusted easily and effectively during operation of the kiln in order to change the divergence angle of the high-speed jet air streams to change the flame shape and optimize the combustion. The jet air nozzles are attached with the nozzle openings divergent to the burner axis at the end of jet air pipes. The nozzle openings are arranged around the burner axis, with the axes parallel, with the jet air pipes arranged inside an annular cooling air space surrounding the coal dust channel and enclosed on the outside by the burner housing pipe.

Abstract: A feed device for a high-pressure roller press for the high-pressure comminution of material to be ground, the feed device feeding the material to be ground in a controlled manner into the roller nip between two rollers of the high-pressure roller press. The feed device has at least two rotary valves, the position of which is variable independently of each other. In a refinement of the invention, the feed device also has a shaft which is variable in height above the roller nip. By means of the rotary valves which are variable independently of each other and by means of the height-variable shaft, the feeding behavior of the feed device can be varied during the starting of the high-pressure roller press and during the operation of the high-pressure roller press in order thereby to prevent the high-pressure roller press from vibrating and to ensure optimum operation of the high-pressure roller press.

Abstract: In order to provide a rotary-furnace burner in which the quantity fraction of cost-effective particulate secondary fuels to be used as energy carriers can be increased and the configuration of the burner flame can be influenced, even during the operation of the burner, it is proposed, according to the invention, to arrange an expansion chamber open towards the burner mouth and having a widened cross section, as compared with the tube or individual tubes in the burner in front of the issue of the tube or tubes for blowing out the secondary fuels, and to make the axial length and the volume of the expansion chamber variable, during the operation of the burner, by means of the axial displacement of the secondary-fuel tubes, so that the particulate secondary fuel particles blown out at the burner mouth with a considerably reduced velocity do not fly past the burner flame, but, instead, burn out in the flame.

Abstract: A method for the production of an annular casing for the press rollers of roller presses for the pressure comminution of particulate material, the outer surface of which casing always has a high degree of hardness and consequently a high wear-resisting capability, but the radially inner region of which casing has a lower degree of hardness to avoid casing ruptures. The annular casing is cast of nodular cast iron with at least the alloying elements Ni and Mo. The cast body is given a bainitic structure with residual austenite by a subsequent heat treatment followed by controlled cooling. The outer surface is constantly re-hardened during use via pressure loading such that martensite is constantly formed in boundary layers of the outer surface.

Abstract: A machine frame for a high-pressure roller press for receiving the rollers in the bearings of the press, including at least one first frame element below the rollers and at least one second frame element. At least one connecting element is provided for connecting the at least one first frame element to the at least one second frame element. The at least one connecting element has a U-shaped design forming two limbs. With this design, the frame can be constructed with smaller dimensions than current constructions and in one piece, because no releasable connections are necessary with this configuration of the machine frame. This design saves weight.

Abstract: A lateral wall arrangement for laterally bounding the roller gap of a roller press having rollers supported in a machine frame, driven in opposite directions, and forming a roller gap, comprising a lateral wall, an assembly device, and a suspension for the lateral wall, wherein the lateral wall is supported in a spring-loaded manner by the suspension. The suspension is a linkage in the simplest case. It is thus achieved in an advantageous manner that the lateral wall is both easy to dismantle and is able to follow deflection motions of the rollers.

Abstract: The aim of the invention is to provide a roll crusher for a grate cooler for cooling hot bulk material, in particular hot cement clinker, comprising several parallel crusher rolls. Said rolls are driven in opposite directions and comprise respective rotatably mounted axle tube rolls, onto each of which a large number of crusher rings that can be connected to the axle tube can be pushed. According to the invention, the crusher rings are configured in such a way that crusher elements project from the cylindrical outer face of the crusher rings, said elements being uniformly distributed both over the periphery and over the width of the crusher rings.

Abstract: A method of producing cement clinker including the steps of preheating raw meal comprising calcium carbonate in a preheating stage that is preheated by the exhaust gases of a sintering stage connected downstream in the direction of the gas flow, neutralizing the preheated raw meal, sintering the raw meal into cement clinker in a sintering stage, and cooling the cement clinker from the sintering stage in a cooling stage that cools the cement clinker with a gas. The exhaust gases of the sintering stage are combined with the exhaust gases of the neutralization, and the combined exhaust gases are conducted in an open gas circuit. The CO2 emissions are substantially reduced over known systems with CO separation, and the formation of nitrogen oxides by the combustion of atmospheric nitrogen in the oxidative environment of the sintering stage burner is almost completely prevented.

Abstract: A recirculating grinding mill, including at least two rolling presses for comminuting the material to be ground, at least two first classifiers for classifying a coarse-grain fraction, at least one second classifier for classifying a fine-grain fraction and a medium-grain fraction from the fractions classified in the at least two first classifiers. The feedstock is fed into the recirculating grinding mill passing the at least two rolling presses and the at least two first classifiers and then the at least one second classifier and the medium-grain fraction and the coarse fraction of the at least two first classifiers being fed once again to the rolling presses, and the at least two first classifiers being arranged underneath the at least two rolling presses. The rolling presses are placed between at least two risers for transporting the circulating material being ground.

Abstract: A grinding roller for the high-pressure comminution of granular milling material, having a reinforcement with hard bodies which protrude from the surface of the main part of the grinding roller. At least some of the hard bodies have a continuous recess, wherein the recess extends in the radial direction of the grinding roller. Refurbishing the surface of the grinding roller is substantially simplified by the continuous recess.

Abstract: A grate cooler plate including an air inlet and air passage openings through which the air flows for cooling the cooling goods present on the grate cooler plate. A rotatable insert having air passage openings is located in an upper surface of the grate cooler plate. The effect of the grate plate is that bulk goods placed in the inlet region of a grate plate cooler expand out to a flat cone of bulk goods.

Abstract: In order to create a roller press, particularly for comminuting a bed of material, the roller press having two rollers separated from each other by a roller nip and using hydraulic cylinders to press the one roller against the oppositely situated roller over the material situated in the roller nip, the stress on the surface of the rollers to be reduced and their service life to be increased, it is proposed according to the invention that both rollers are designed as loose rollers that are displaceable transversely relative to the roller nip, the bearing housings of the rollers being supported on side parts of the machine frame by hydraulic cylinders that apply the roller compaction pressure.

Abstract: A cement clinker production line with a calcining stage connected upstream of the rotary tubular kiln including an integrated calcining combustion chamber, with a CO-containing reduction zone whose size and reduction potential can be adapted to different NOx contents contained in the kiln exhaust gas and/or different types of secondary fuels used in the combustion chamber. The combustion chamber has an upper, raw-meal-free reducing zone with a feed for secondary fuels, and first tertiary partial airstream with sub-stoichiometric fuel combustion for gasifying the secondary fuels. The combustion chamber has a lower zone. The inflow for at least one raw meal partial stream and one second tertiary partial airstream are arranged in the junction region of the upper zone and the lower zone. The height (H) of the upper zone in relation to the height (h) of the lower zone has a ratio of approximately 5:1 to approximately 1:1.