| OCR Text |
Show ducts and pollution control equipment must be evaluated for each site since they make up a significant portion of the installation costs. Table 8 displays the costs and savings predicted for a batchlcullet temperature of 850°F. Payback rates of one to four years are predicted. Payback is most attractive for t~e larger furnaces because installation costs are a smaller fraction of the cost of equipment In larger installations. CONCLUSIONS In conclusion, batchlcullet preheating using the Raining Bed Cullet/Batch Preheater offers significant cost and performance savings to the glass industry. Payback periods of one t~ f~ur years are predicted with 850°F preheat for the retrofit of the Cullet/Batch Preheater to eXlstmg furnaces. Preheat temperatures of 1000°F have been demonstrated at steady state conditions for up to 12 hours with 1300°F inlet gases which promise reduced payback periods. These savings can be achieved with reduced electric boost or reduced fuel use. Further, CulletlBatch Preheating can be used to boost the furnace pull rate in much the same way as electric boost is used. REFERENCES 1. William Kays and A. L. London, Compact Heat Exchangers, 2nd edition, McGraw-Hill Book Company, New York, 1964. 2. William E. Cole, Gregory L. Ridderbusch, Ashok Bendre, Shery Panahe, "Installation and Operation of a Cullet Preheating System", 49th Conference on Glass Problemes, November 15 &16, 1988, Ohio State University. 3. W. E. Cole, F. Becker, L. Donaldson, S. Panahe, "Operation of a Cullet Preheating System", 50th Conference on Glass Problemes, November 7 &8, 1989, University of illinois at Urbana-Champaign. 4. Ronald Schroeder, Allan E. Zak, "Oxy-Fuel Economics Update based on Case Histories" , Glass 95, 56th Conference on Glass Problems, University of Illinois, Urbana, lll. November 1995. 6 |
