Abstract:
Described is a plant for manufacturing cement clinker comprising a preheater (1) which comprises at least one last cyclone (1d) and at least one next-to-last cyclone (1c) which is connected in series via a gas duct (2c) to and fed with gas from the last cyclone (1d), a calciner (3) which comprises at least one inlet opening (9) for introducing preheated raw meal from the last cyclone (1d), and which is connected to a subsequent separating cyclone (4), a gas duct (2d) which connects the separating cyclone (4) to the last cyclone (1d), and which comprises at least one inlet opening (11) for introducing preheated raw meal from the next-to-last cyclone (1c). The plant is peculiar in that the inlet opening (11) for introducing preheated raw meal from the next-to-last cyclone (1c) into the gas duct (2d) which connects the separating cyclone (4) to the last cyclone (1d) in a vertical plane is located under at least one inlet opening (9) for introducing preheated raw meal from the last cyclone (1d) into the calciner. Hence, without affecting the installation height of the preheater, it will be possible to locate the last cyclone (1d) of the preheater (1) at an arbitrary height relative to the calciner (3), and preheated raw meal from the last cyclone (1d) can therefore be introduced at any point into the calciner (3) without any use of lifting equipment.
Abstract:
The invention relates to a method for producing marl slags and marl slag cements or mixed constituents for mixed cements made of marl with a basicity CaO/SiO2 of
Abstract:
In a process for converting well drill cuttings into raw materials for the production of cement comprising the steps of extracting limestone and clay, crushing and prehomogenizing the extracted materials, raw grinding, and adjusting the composition by adding correctives, producing clinker in rotary kiln and cement grinding, the water based drill cutting sludge is introduced in the crushing and prehomogenizing step and the oil based drill cutting sludge is fed into the rotary kiln.
Abstract:
A kiln plant for manufacturing cement, said plant comprising a kiln (1), a cooler (4), a calciner (2) with subsequent separation cyclone (9), a burning compartment (3) provided at its upper part with a central burner (16), and featuring below the burner a tangential inlet through which hot gas is fed, via a duct (5), from the cooler (4) to the burning compartment (3), said duct (5) being provided with an inlet (14A) for raw meal, the lower part of the burning compartment (3) being provided with a connection (7) to the calciner (2), and a second connection (6) directing the exhaust gases from the kiln (1) to the calciner (2). The kiln plant is of a relatively simplified construction and it may advantageously burn fuel with a low reactivity, such as petcoke, anthracite and other grades of coal with a low gas content in the calcining zone.
Abstract:
Cement clinker is produced using high sulfur fuels by combusting high sulfur fuel within a kiln. The feed material is introduced at an inlet of the kiln and is sintered by the combusting fuel to form sintered material. The sintered material is cooled to form cement clinker. The production of the sintered material is controlled by measuring the sulfur content in the cement clinker and using that measurement to control the concentration of oxygen at the inlet of the kiln.
Abstract:
A method of heating solids in a reactor to produce a heat-treated material, such as a cementitious, a supplementary cementitious, or a pozzolanic material, comprising: conveying the solids through the reactor from a feeding end to a discharge end so as to form a material bed extending from the feeding end to the discharge end; heating the solids during said conveying step to at least 600°C to transform the solids into the heat-treated material, wherein said heating step comprises applying radiative heating to the material bed from above and/or from the sides, wherein said radiative heating contributes at least 60%, preferably at least 80% of the thermal energy needed for said heating step, and wherein the material bed is mobilized during the conveying step in order to renew the surface of the material bed that is exposed to the radiative heating.
Abstract:
Die Erfindung betrifft eine Anlage (100, 200) zur Herstellung von Zementklinker (Z) aus Zementrohmehl (R), aufweisend eine Wärmetauscherkomponente (110), bestehend aus Zyklonwärmetauschern (111, 112, 113, 114) als Vorwärmer für das Zementrohmehl (R), eine mit Brennstoff (B) und Tertiärluft (TL2) aus einem in der Anlage (100, 200) vorhandenen Zementklinkerkühler (150) versorgte Vorcalcinierstufe in Form eines Calcinators (130), eine Sinterstufe in Gestalt eines Drehrohrofens (140), einen materialflussseitig nachgeschalteten Zementklinkerkühler (150), und einen Drehtrommelreaktor (170) zur Verschwelung und/oder Verbrennung von Sekundärbrennstoffen (SB), wobei ein Gasaustrittsende (170') des Drehtrommelreaktors (170) über eine Leitung (180) mit dem Calcinator (130) in Verbindung steht zur Einleitung der Gase aus der Verschwelung und/oder Verbrennung der Sekundärbrennstoffe (SB) in den Calcinator (130), und wobei ein Gutaustragsende (170'') des Drehtrommelreaktors (170) mit einer Drehrohrofeneinlaufkammer (120) in Verbindung steht. Erfindungsgemäß, dass das Gasaustrittsende (170') und das Gutaustragsende (170'') an gegenüberliegenden Seiten des Drehtrommelreaktors (170) angeordnet sind. Durch den Gegenstrom von Material und Gas ist es möglich, auch unsortierter Sekundärbrennstoff einzusetzen und sogar auf einen Pilotbrenner zur Unterhaltung der Verschwelung zu verzichten.