Apichit Therdyothin creator Bhattacharya, Sribas C. Chairperson Surapong Chirarattananon Co-Chairperson Tabucanon, Mario T. Examination Committee Prida Wibulswas Examintion Committee Williamson, A. G. Examination Committee Government of Japan Scholarship Donor text series technical report th Bangkok Asian Institute of Technology 1992 continuing eng 97, [43] leaves The cogeneration potential of sugar mills in Thailand has been studied. Models of the , existing sugar mills developed show that the excess bagasse ·is 12 % of produced bagasse or 1.02 million tons which can generate approximately 214 GWh of electricity. To achieve more excess bagasse, four energy conservation opportunities, e.g. boiler excess air control, bagasse dryer, condensation heat recovery of flue gas and use of thermo-compressor in multiple effect evaporator have been studied. The results show that the total excess bagasse potential is about 28 % of produced bagasse. Four alternatives have been considered to increase the electricity generation potential from excess bagasse. These are use of bagasse dryer, use of cane tops and leaves, use of high pressure boiler with single extraction-condensing steam turbine (SECST) and use of high pressure boiler with double extraction-condensing steam turbine (DECST). The estimated costs of electricity generated from these four alternatives are 1.23, 2.80, 7.28 and 7.08 C/kWh respectively. To select the most suitable alternative that gives the maximum benefit to the country not, only financial factor is considered but also the impacts on environment and the society. The analytic hierarchy process (AHP) has been used to select the best alternative based on following criteria i) Government investment, ii) Private investment, iii) Total operating cost, iv) S02 emission, v) Employment generation, vi) Availability of local equipment, and vii) Dependency on foreign assistance. The result of five decision makers from five related organization in Thailand show that SECST and DECST system are the best alternatives due to their very low government investment and S02 emission. For maximum financial benefit to the sugar mills which apply SECST and DECST systems, the proper size of boilers and turbo generators must be selected from the commercially available equipments. Using mixed integer linear programming technique, the optimum size of the boilers and turbo generators have been selected for small, large and very large sager mills. The annual benefit of small, large and very large size sugar mills, if proper SECST system is used, is 1.3, 2.4 and 4.6 million US$ respectively while the benefit is 1.9, 4.4 and 6.4 million US$ respectively if DECST system is used. A dissertation submitted in partial fulfillment of the requirements for the Degree of Doctor of Engineering, school of Environment, Resources & Development Thesis (Ph.D.) - Asian Institute of Technology Cogeneration of electric power and heat Thailand Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B16465 http://203.159.5.9/ait-thesis/detail.php?q=B16465 170699 20260817163528.0