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Zhou S.,Shandong Jiaotong University | Zhang Y.,Shandong Green Energy Gas Industrial Co. | Dong Y.,Shandong University
Energy | Year: 2012

Stack-pretreatment is introduced to gain higher biogas production from corn stover through solid state anaerobic digestion. The purpose of this study is to find the effects of naturally microbial pretreatment on stalk lignin, cellulose and hemicellulose degradation, and biogas production. The result indicates that the corn straws which had been stack-pretreated for 20 days decreases of the content of the middle corn straws cellulose, hemi-cellulose and lignin by 5.8%, 16.8% and 5.7% respectively lower than that of the untreated samples.The highest cumulative biogas yield for 60-day digestion was obtained in B group, which was 23.2% higher than that of A group, 29.1% higher than H group and also 40.7% higher than I group. The result indicates the biogas yield of anaerobic digestion of the pretreated corn stover mixed with cow dung is higher than that of the untreated ones mixed with cow dung, and higher than that of the untreated ones alone, also higher than the cow dung alone. The biogas yield of the pretreated corn stover mixed with cow is higher than the pretreated ones with the sludge. © 2012 Elsevier Ltd.


Zhou S.,Shandong University | Dong Y.,Shandong University | Zhang Y.,Shandong Green Energy Gas Industrial Co. | Wang W.,Shandong University | And 2 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2011

The pint-sized gas mixed-refrigerant liquefaction process was designed to analyze the exergy loss by using Aspen HYSYS software. The temperature and the pressure of bubble point and the dew-point were obtained from the PR equation, and the liquefied rate and energy consumption was calculated. Subsequently, the exergy loss was calculated via the thermodynamic analysis, and the methodology for reducing exergy loss was approached. An experiment was conducted to measure the exergy loss. The results showed that small gas mixed-refrigerant liquefaction process was feasible, while the largest exergy loss in the liquefaction process was compressor. With flash evaporation pre-cooled freezing medium on the top of storage tank, the reduction of exergy loss for compressor and chiller were 12.2% and 27.2%, respectively.


Zhou S.,Shandong University | Dong Y.,Shandong University | Zhang Y.,Shandong Green Energy Gas Industrial Co. | Sun H.,Shandong University
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2011

According to the differences in physical properties between CO2 and CH4, the temperature and pressure of bubble point and dew point of the biogas with different volume fractions could be obtained with PR equation. Based on Aspen HYSYS, the liquefaction process of separating CO2 from biogas was designed. The effects of low temperature liquid separation on CO2 and CH4 from biogas were analyzed. The experiment of biogas purification was carried out and the result was consistent with that of simulation. The results of the experiment showed that the volume fraction of CH4 increased from 58.2% to 82.8%, the volume fraction of CO2 decreased from 36.4% to 8.8%, and the volume fraction of N2+O2 was less than 4.0%.


Zhou S.,Shandong Jiaotong University | Zhang Y.,Shandong Green Energy Gas Industrial Co. | Zhang H.,Shandong Jiaotong University
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2013

Microbial pretreatment can enhance biogas production from corn stover through solid-state anaerobic digestion, but the price of microbial strains is high. Stack-pretreatment is introduced to gain higher biogas production from corn stover through solid-state anaerobic digestion. The purpose is to find the effects of naturally microbial pretreatment on stalk lignin, cellulose and hemicellulose degradation, and biogas production. The result indicates that the corn straws which has been stack-pretreated for 20 days decreases of the content of the middle corn straws cellulose, hemi-cellulose and lignin by 5.8%, 16.8% and 5.7% respectively lower than those of untreated samples. The highest cumulative biogas yield for 60-day digestion is obtained in the group that the mass ratio of corn stover and cattle dung is 1:1, which is 24.4% higher than that of untreated corn stover mixed with cattle dung with the same mass ratio. When the mass ratio of corn stover and slug is 1:1, the cumulative biogas is 23.27% higher than that of untreated corn stover with slug.

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