摘要:
Apparatus for the thermal treatment of finely divided material for the calcination of cement wherein the material is preheated in a multi-stage heat exchanger and later passed to a calcining furnace. The material is partly deacidified in a pre-calcination zone before entering the sintering furnace where further calcining and sintering of the material is completed. A portion of the feed material is treated with rapidly oxidizing fuel components in a pre-calcination zone in a first stage and with more slowly oxidizing fuel components in a second stage, the more slowly oxidizing fuel components being a mixture of relatively fine granulated fuel particles of substantially uniform size and larger particles of briquetted or coarsely broken fuel.
摘要:
Apparatus for the cooling of cement clinker or the like being discharged from a rotary kiln, the apparatus including at least two cooling means arranged to receive the discharge from the rotary kiln and adjustably positionable distributor means arranged to proportion the discharge of the rotary kiln selectively between the two or more cooling means.
摘要:
A method and apparatus for the thermal treatment of alkali-containing pulverent raw material used in the manufacture of cement in which the material is preheated in a preheater and after sintering in a furnace is conveyed to a cooler. Alkali free exhaust air from the cooler is conveyed into the preheater for heating the material and the alkali-containing furnace exhaust gases are cooled by means of adding a portion of the pulverized raw material to them in a heat exchanger. The alkali salts are condensed and are separated off in a dust collecting chamber.
摘要:
In the production of cement clinker or cement with the addition of a cement additive (40), such as for example slag, which is ground in a closed-circuit grinding installation into slag meal (32) of equal fineness to cement, in order to utilize excess slag capacity in a beneficial way in the cement clinker production process, an intermediate slag fraction (33, 34) withdrawn from a three-fraction classifying device (31) is added as a raw material component to the stock inlet of the rotary kiln (20) of the cement clinker production line, and at the same time the chemical composition of the remaining raw material components (10) is adapted to the added quantity (34) of the intermediate slag fraction.
摘要:
To create a calcinator for a cement clinker production line which is connected to the rotary tubular kiln in series and which is equipped with double firings, in which it is possible expediently to dispose of lumpy combustibles such as unchipped used tires and/or other lumpy secondary combustibles by pyrolysis or potentially by combustion for the purpose of the high-grade calcination of the cement raw meal, without the pyrolysis process interfering with the calcination process, while simultaneously ensuring an exhaust gas having low NOx emissions, it is inventively proposed to slide the lumpy fuel such as old tires onto a displacement mechanism such as a grate that is transversely disposed in an additional tertiary air channel in the area of the junction with the exhaust gas channel of the rotary kiln, the lumpy fuel being pyrolized or burned on this mechanism with the aid of a tertiary air substream whose volume can be regulated, and the residue of the pyrolysis or combustion being pushed from said displacement mechanism into the rotary kiln exhaust gas channel, into which channel the CO-laden pyrolysis gas, or respectively, smoke gas that is generated is also fed.
摘要:
In order to create, for cement clinker production lines, a calcinator that is connected upstream from the rotary tubular kiln and is equipped with two firings, which enables on the one hand a high-grade calcinated raw meal and on the other hand an exhaust gas with very low NOx emissions, as well as a burning that is as complete as possible of remaining CO-containing NOx reduction zones, it is provided that a combustion point with sub-stoichiometric fuel combustion be arranged both in the rotary kiln exhaust gas ascending line and also in the cooler outgoing air line which form a first and section portion, respectively, of the calcinator and that downstream in a flow direction of the suspension, additional combustion air discharges into the calcinator which combustion air is branched off from the tertiary air line coming from the clinker cooler via at least one branch line.
摘要:
An installation for calcining finely divided particles such as for the preparation of cement including a building which houses a pre-heater, a relatively short rotary tubular kiln which receives the pre-heated particles from the pre-heater, and a rotary cooler which receives the discharge from the rotary kiln, the rotary cooler having a discharge end received in a portion of the building below the pre-heater, the discharge end of the rotary cooler being surrounded by sound absorbing material.
摘要:
In order to create a surface armoring suitable for the autogenous wear protection with application of grid armoring technology that exhibits a long service life capability due to high wear-resistance and compressive strength and that can nonetheless be manufactured and repaired relatively simply and cost-beneficially overall, particularly for the grinding rollers of high-pressure roller mills for the pressure comminution of granular material, it is inventively proposed that depressions spaced from one another be formed in the outside surface of the roller jacket and that prefabricated, highly wear-resistant hard bodies be pressed into the depressions, namely onto an adhesive compound that fills out the space provided with cavities between the bottom of the depressions and the underside of the hard bodies that have been fitted in.
摘要:
In order to create, for cement clinker production lines, a calcinator that is connected upstream from the rotary tubular kiln and is equipped with two firings, which enables on the one hand a high-grade calcinated raw meal and on the other hand an exhaust gas with very low NOx emissions, as well as a burning that is as complete as possible of remaining CO-containing NOx reduction zones, it is provided that a combustion point with sub-stoichiometric fuel combustion be arranged both in the rotary kiln exhaust gas ascending line and also in the cooler outgoing air line which form a first and section portion, respectively, of the calcinator and that downstream in a flow direction of the suspension, additional combustion air discharges into the calcinator which combustion air is branched off from the tertiary air line coming from the clinker cooler via at least one branch line.
摘要:
A rotary kiln construction wherein the kiln cylinder has an annular bearing ring for supporting the kiln in rotation with spacer plates located between the ring and the outer surface of the cylinder and circumferentially spaced from each other with supporting assemblies at each axial side of the bearing ring secured to the outer surface of the cylinder having retaining elements projecting on both circumferential sides of the plates and being radially outward of the plates to provide a radial inward support to the plate ends constructed for retaining the plates and for ease of replacement and removal without rewelding the full plate assembly on the cylinder.