000			03728nas a2200385 4500
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008			290998s1992 th r 000| eng d
035			_a.b10243458
099		9	_aAIT Thesis no.ET-92-8
100	0		_aFu Xiaofeng
245	1	0	_aEnergy management in corn alcohol distilleries in China
260			_aBangkok : _bAsian Institute of Technology, _c1992
300			_a103 leaves : _bill.
490	1		_aThesis ; _vno. ET-92-8
500			_aA thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering
502			_aThesis (M.Eng.) - Asian Institute of Technology
520			_aThe energy consumption pattern in two corn alcohol distilleries in China, Liaoning Province, were investigated and analyzed. The electri city consumption was about 1 MJ e and steam consumption about 18.5 MJth per liter pure alcohol (1 p.a.) in bot h distilleries. Cooking and distillation consumed about 34 % and 56% of the total thermal energy , respectively. This study focused on analyzing the energy conservation potential of a) the vapor recompression cyc l e (VRC) system in distillation processes and b) biogas generated by anaerobic digestion of wastewaters (slops). As already mentioned, the largest energy consumer is distillation wit h a share of 56% (Longguan) and 57% (Shenyang) of the total energy consumption, respectively. A vapor recompression cycle system (heat pump), may reduce the total energy consumption (electricity+ steam) by 44% and 46%. Ass uming an initial investment of 18315$ (Longguan) and 27472$ (Shenyang), payback periods of about 3 and 4 years, respectively could be achieved. By applying the Contois kinetic model, the operating conditions of the existing HYBRID biogas plant were opt imi zed in regard to maximum volumetric me thane production rate (2 . 85 CH4 N m3/m3). The following conditions were proposed: HRT: 1.4 days, temperature: 40°C, substrate con centration: 23.4 CODo/l. If all the s lop (135 m3/d) would be treated, in Longgaun about 1,080 Nm3 CH4/d (about 8 Nm3 CH4/m3 slop) could be generated . This corresponds to 288 MJ/m3 slop at a slop : ethano l ratio of 14.71, to 4.23 MJ/l p.a.. The specific e n ergy consumption may replace 88% of the electricity consumpt ion. Actually, 38% of the slop is treated. Thus, the specific energy production from slop is 1.6 MJ/l p . a .. This could cover , at an energy conversion efficiency of 0.23 from methane to electricity. Only 36% of the electricity consumption could be replaced. And the energy bill will be reduced from 0 . 056 $/1 . p . a to 0.047 $/1 . p.a. (Longquan) and from 0.044 $/1.p.a . to 0 . 038 $/1.p.a. (Shenyang), respectively, calcu l ated with a e l ectricity cost 0.033 $/kWh.
650		0	_aDistilleries _xEnergy concumption
700	1		_aTentscher, Wolfgang, _eChairperson
700	1		_aMora, J. A., _eExamination Committee
700	1		_aYongping, Zhai, _eExamination Committee
710	2		_aEEC, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. ET-92-8
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B16250
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