CAJ | 학술논문

对发酵过程进行模拟优化是降低乙醇生产成本、促进乙醇工业化生产的有效途径.考虑到乙醇发酵过程中存在的各种竞争性抑制作用,结合连续生产的全混釜模型方程,利用Aspen Plus软件编写并建立了用户模型,实现了玉米清液连续发酵制乙醇过程的全流程模拟,模拟结果与工厂生产所测数据一致.同时对发酵过程进行了分析,优化了生产条件.计算结果表明,发酵罐中糖液的进料情况对结果影响较大,预发酵以及酵母回流是为了维持系统内合适的菌体浓度,需要根据实际情况调整;为了避免系统染菌,发酵过程宜采取带压操作,压力0.12～0.14 MPa为佳;工厂实际生产工艺中,前3个发酵罐的热负荷较大,需要重点采取散热措施.对发酵系统进行热量优化有利于生产发酵罐的温度控制,提高产品质量.
대발효과정진행모의우화시강저을순생산성본、촉진을순공업화생산적유효도경.고필도을순발효과정중존재적각충경쟁성억제작용,결합련속생산적전혼부모형방정,이용Aspen Plus연건편사병건립료용호모형,실현료옥미청액련속발효제을순과정적전류정모의,모의결과여공엄생산소측수거일치.동시대발효과정진행료분석,우화료생산조건.계산결과표명,발효관중당액적진료정황대결과영향교대,예발효이급효모회류시위료유지계통내합괄적균체농도,수요근거실제정황조정;위료피면계통염균,발효과정의채취대압조작,압력0.12～0.14 MPa위가;공엄실제생산공예중,전3개발효관적열부하교대,수요중점채취산열조시.대발효계통진행열량우화유리우생산발효관적온도공제,제고산품질량.
Simulating and optimizing the ethanol fermentation process will benefit the ethanol production and decrease its cost. Using Aspen Plus software, a user model library was established by writing user programs. The simulation of the whole continuous ethanol fermentation process using the purified corn saccharification liquid as fermented medium was accomplished, and it shows that the simulation results agree well with the production data. Then the continuous ethanol fermentation process was analyzed and the production conditions were optimized. The results show that the corn saccharification liquid feeding amount affects the fermentation results obviously, and the arrangements of pre-fermentation and recycle of yeast in the fermentation system are used to keep a proper yeast concentration in the system which should be adjusted according to practical situation. In order to avoid the infection of the system by other bacteria, it is suitable to maintain the fermentation system at a low positive operating pressure, such as 0.12～0.14 MPa. In present fermentation process, the heat loads of the former three fermenters are a little too height, it needs to take some measures to improve it. Therefore the heat load optimization of the fermentation system was conducted to make the fermentation temperatures of fermenters under control, which will enhance the quality of the produced ethanol.