6.0x95m 12000t/d Cement Rotary Kiln For Minerals Process Applications
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Rotary Kiln for Cement and Minerals Process Applications
Products Description Cement Rotary KilnRotary kilns are synonymous with cement making, being the workhorses of this
industry. There are many types of rotary kiln arrangements for producing cement clinker with each incremental design goal aimed at improving energy efficiency, ease of operation, and product quality and minimizing
environmental pollutants. Rotary cement kilns can be classified into wet-process kilns, semidry kilns, dry
kilns, preheater kilns, and precalciner kilns. All of these are described in the
book by Peray (1986) and many others, hence we will not dwell upon them here. Rather, we
will briefly show the pertinent process chemistry and the heat
requirements that drive them, so as to be consistent with the
transport phenomena theme. Rotary kilns have been used in various industrial applications (e.g., oil shale retorting, tar sands coking, incineration, cement production, etc.). The rotation of a cylinder-shaped vessel positioned longitudinally approximately 30° of the horizontal position ensures a continuous motion of catalyst between the entrance and exit of the kiln. With regard to the spent catalyst regeneration, the description of rotary kilns was given by Ellingham and Garrett [451]. There are two types of rotary kilns, i.e., direct fire and indirect fire. The direct fire is a single shell vessel with rings added inside to slow the catalyst as it tumbles from the inlet (elevated part) towards outlet (lower part). The oxidation medium flows countercurrent to catalyst movement. The O2 concentration in the medium will decrease in the same direction because of its consumption. Therefore, the zone in the vessel located near the inlet may function as a stripper of volatile components of coke. The kiln is fired by gas burners directly against the outer shell of the vessel. The temperature inside the kiln is controlled by adjusting the burner heat, varying concentration of O2 in the oxidizing medium and its flow. The indirect fire kiln comprises a double-shell cylinder vessel. The inner shell is similar as that of the direct fire kiln. The space between the shells is heated either by combustion gas or steam. In some cases, the inner cylinder shell is ebullated allowing hot gases or steam to enter and contact the tumbled catalyst. The catalyst temperatures are controlled by monitoring the temperatures of the inlet and outlet gases. It is believed that Eurocat process evolved from a rotary kiln process by be improving the control of operating parameters such as temperature, gas flow, speed of rotation, etc. Rotary kiln
Cement Rotary Kiln Burner/Gypsum Rotary Kiln technical
characteristics:
In the Wet Process, the kiln system is fed with liquid slurry, the
water then being evaporated in the kiln. In the Semi-Wet Process, raw material is prepared as a slurry, but a substantial proportion (50-80%) of the water is mechanically removed, usually by filtration, and the resulting "filter cake" is fed to the kiln system. In the Dry Process, the kiln system is fed with dry raw meal powder. In the Semi-Dry Process, a limited amount of water (10-15%) is added to dry raw meal so that it can be nodulised, and the damp nodules are fed to the kiln system. The original rotary cement kilns were called 'wet process' kilns. In their basic form they were relatively simple compared with modern developments. The raw meal was supplied at ambient temperature in the form of a slurry. A wet process kiln may be up to 200m long and 6m in diameter. It has to be long because a lot of water has to be evaporated and the process of heat transfer is not very efficient. The slurry may contain about 40% water. This takes a lot of energy to evaporate and various developments of the wet process were aimed at reducing the water content of the raw meal. An example of this is the 'filter press' (imagine a musical accordion 10-20 metres long and several metres across) -such adaptions were described as 'semi-wet' processes. The wet process has survived for over a century because many raw materials are suited to blending as a slurry. Also, for many years, it was technically difficult to get dry powders to blend adequately. In a modern works, the blended raw material enters the kiln via the pre-heater tower. Here, hot gases from the kiln, and probably the cooled clinker at the far end of the kiln, are used to heat the raw meal. As a result, the raw meal is already hot before it enters the kiln.The dry process is much more thermally efficient than the wet process. FAQ Q: Why we believe in luoyang zhongtai industries co., ltd: A: 1. More than 30 years experience. 2.We are the leading
professional supplier of mining machinery, construction machinery,
machines casting and forged parts. 3. All products achieved
ISO9901:2000 quality management certificate and CE, ROHS
certificates. Q:Delivery time A: parts lead time 1-2months, machines 2-3months. Q:Payment terms
A: Accept payment type: T/T, L/C, Western union,Cash. 30% deposit
when signed contract. Full payment paid before shipping Q: Quality warranty? A: guarantee time: one year for main machinery. If something wrong
we will provide the technical advice and find solution immediately.
For those wearing parts we guarantee high quality parts for
long-term supply. Q: After sales service? A: we can supply technical guide for machines running test and
parts maintenance if end user needs. |
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| Product Tags: 12000t/D Cement Rotary Kiln 6.0x95m Cement Rotary Kiln 6.0x95m vertical lime kiln | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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6.0x95m 12000t/d Cement Rotary Kiln For Minerals Process Applications |