This paper proposes the use of a coal-fired, closed-cycle gas turbine to provide electric power and process heat to a “wet process” cement plant. Taking the example of a large plant requiring 100 million kilowatt-hours of electric energy per year, it is estimated that, by substitution of in-plant power generation for purchased electricity and use of reject heat for slurry dewatering, annual energy cost savings (at current rates) sufficient to pay off the capital cost of the installation between 5 and 15 years (depending upon the amount of that cost) could be realized. This degree of savings will increase as the price of power increases due to “normal” projected escalation of coal costs, plus the imposition of requirements for emission control equipment to meet stringent environmental quality standards. Because the fly ash from pulverized coal firing and the limestone sludge from a stack gas scrubber represent feed materials for the cement process, emission control does not constitute the burden on a cement plant that it would for an electric utility, but rather permits additional savings due to effective use of “waste” materials. Conservation of energy, material resources and the environment could thus be accomplished simultaneously.
- International Gas Turbine Institute
Gas-Turbine Total Energy System for a Cement Plant
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Green, L, Jr. "Gas-Turbine Total Energy System for a Cement Plant." Proceedings of the ASME 1977 International Gas Turbine Conference and Products Show. ASME 1977 International Gas Turbine Conference and Products Show. Philadelphia, Pennsylvania, USA. March 27–31, 1977. V001T01A021. ASME. https://doi.org/10.1115/77-GT-22
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