Thermal analysis of a sugar mill in Taiwan | |
| Author | Cheng, Eel-Tai |
| Call Number | AIT RSPR no. ET-89-14 |
| Subject(s) | Thermal analysis Sugar factories |
| Note | A research study (9 credits) submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | The energy crisis in 1973 , and the rising cost of the fuel made saving energy in virtually every industry. However this is especially important to the cane sugar industry, since it always takes much power for transportation , shredding and milling of the cane and requires much heat for heating of the juice evaporation of water and crystallization of sugar from syrup Usually the fuel cost in Taiwan sugar" industry is even up to 70 - 75 % of total processing cost . Hence the conservation of energy has attracted the attention of sugar technologists and engineers. The cogeneration system and evaporation system in Chifu Sugar Mill , the largest raw sugar producing mill in Taiwan, were studied Energy and exergy analyses of the components of the cogeneration system and evaporation system were carried out . The best case efficiency of the boiller was found to be 62. 1 % and the worst case efficiency was found to be 61. 19 % . Using the component analysis , the analysis of the cogeneration system as a whole was carried out . The energy analysis indicates that the maximum first law efficiency of the cogeneration system was 58. 95 % Based on energy and exergy analyses , energy conservation measures are suggested to improve the efficiency of the system Major energy conservation measures suggested are reduction of excess air supplied to the boilers , installation of bagasse dryer and operating the turbogenerator and milling turbines at their rated capacity . The feasibility of bagasse drier using flue gas from the boiler is also carried out. The best case efficiency of the evaporation system is 94. 89 % and the worst case efficiency is 94. 13 % Major energy conservation measures suggested are utilization of 3rd effect vapor , raising the exhaust steam pressure as high as possibl e and vapor recompression . When using 3rd effect vapor to heat 1st heater in place of 2nd effect vapor , the amount of bagasse saved is 1, 113 tons per milling season, which costs 467, 376 N. T. and the payback period is 1. 07 years . The live steam required will be 403 kg/t. c ( 40 . 3 % on cane> When using vapor recompression in the evaporation system , the amount of bagasse saved is 4, 719. 5 tons per milling season , which costs 1, 982, 202 N. T., and the payback period is 9. 9 years . The live steam required will be 379. 7 kg/t. c ( 37. 97 % on cane ) . |
| Year | 1989 |
| Type | Research Study Project Report (RSPR) |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Energy Technology (ET) |
| Chairperson(s) | Tentscher, Wolfgang |
| Examination Committee(s) | Prida Wibulswas ;Surapong Chiraratananon |
| Scholarship Donor(s) | Taiwan Power Company CR. 0. C) |
| Degree | Research Studies Project Report (M. Eng.) - Asian Institute of Technology, 1989 |