Product category:
Process Monitoring and Optimisation
News Release from: Cinar | Subject: KHD Calciner
Edited by the Processingtalk Editorial
Team on 17 October 2007
Alternative fuels optimisation in a KHD
calciner
Cinar carried out a mathematical study with the primary aim to increase the waste derived fuel contribution in a low-NO configuration of a coal-fired KHD pre-calciner on a cement plant
The waste fuels are co-fired with coal in two parallel ducts 'legs': waste tyre chips and diaper cubes in the riser duct and the lighter wood chips and plastic disks in the tertiary air duct Model simulations of the kiln and precalciner have been performed, subsequent to obtaining all the model inputs related to kiln and precalciner boundary conditions, fuel specifications, flow rates and preheat temperatures
This article was originally published on Processingtalk on 23 Oct 2007 at 8.00am (UK)
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One of the major operational problems has been the dropout of semi-burned tyre chips in the tertiary air duct and the consequent blocking of the passage of tertiary air.
Through improvements to the riser and tertiary air joining area and introduction of a refractory tier below the waste fuel firing location of the tertiary air duct, an enhanced waste fuel proportion has been achieved (from 20% to nearly 50% of the total pre-calciner thermal input).
The optimisation of waste fuel particle size and firing ratios have also established through several parametric simulations.
An additional advantage has been the reduced energy loss in clearing the tertiary air blockage which has been carried out on regular basis prior to the introduced modifications.
Cinar is a high-tech company established in 1988, as a 'spin-off' enterprise from Imperial College London.
It is a broad based engineering and technical consultancy specialising in energy issues, fuel conversions, flame monitoring and control systems and turn-key operation of non-conventional combustion and emission equipment.
Cinar has sought and earned special expertise in the field of advanced mathematical modelling of engineering fluid flows, resulting in valid and accurate simulations.
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