Heat integration of combined 1st and 2nd generation ethanol production from wheat kernels and wheat straw

Sustainable Chemical Processes

Elisabeth Joelsson¹  Mats Galbe¹  Ola Wallberg¹ 

[1] Department of Chemical Engineering, Lund University, Lund, SE-22100, Sweden

关键词: Pinch analysis;    Lignocellulosic;    Wheat;    Simulation;    First and second generation;    Bioethanol;    Heat integration;   

Others  :  1082506
DOI  :  10.1186/s40508-014-0020-3

 received in 2014-04-03, accepted in 2014-09-23,  发布年份 2014

【 摘 要 】

Background

Reducing the energy used in an ethanol plant is an important step towards reducing both the cost and environmental impact of the process. Pinch technology was used to analyze the energy utilization and to investigate possible energy savings in stand-alone and combined 1^st and 2^nd generation ethanol production plant designs. Different heat sources and sinks in the plant were identified to improve energy integration. Four different scenarios were evaluated using Aspen Plus, with heat exchanger networks generated in the simulation program Aspen Energy Analyzer. The total direct cost of the heat exchanger networks was calculated using Aspen Process Economic Analyzer.

Results

It was shown that heating costs could be reduced by 40-47% and cooling costs by 42-54% by heat integration. The sum of the discounted total direct cost for heat exchangers and annual cost of utilities was also lower in the heat integrated cases than in the corresponding non-heat integrated cases for all the configurations investigated.

Conclusion

Heat integration showed that the heating and cooling energy demands could be reduced to a great extent in stand-alone as well as combined 1^st and 2^nd generation bioethanol plants. The cost for heating and cooling of the process can be decreased with heat integration. The main cost for providing the processes with heat can be attributed to the cost of hot utilities.

【 授权许可】

   
2014 Joelsson et al.; licensee Springer.

【 图 表 】

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