Key Laboratory of Clean Production and Utilization of Renewable Energy

Haidian District, China

Key Laboratory of Clean Production and Utilization of Renewable Energy

Haidian District, China
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Li G.,Beijing Technology and Business University | Ji F.,Chinese Academy of Agricultural Sciences | Xiang S.,China Agricultural Machinery Testing Center | Zhou Y.G.,China Agricultural University | And 4 more authors.
International Journal of Agricultural and Biological Engineering | Year: 2017

Pyrolysis-Gas Chromatography-Mass Spectrometry (Py-GC/MS) was adopted to determine the changes in component of BG11-cultivated Desmodesmus sp. (BG11/8-10) pyrolyzed products at different temperatures (300°C-800°C). The results of analysis on a series of total ions chromatogram (TIC) showed that pyrolyzed products of BG11/8-10 at different temperature mainly included aliphatic hydrocarbons, nitrogen compounds, aromatic hydrocarbons, fatty acids, ketones, alcohols, aldehydes and furan compounds. Compared to the bio-oil (42.36%) generated by pyrolysis at 700°C, the relative content of bio-oil generated at 800°C was the highest up to 56.96%. However, higher temperature could easily cause the generation of large quantities of such pollutants as nitrogen compounds and polycyclic aromatic hydrocarbons (PAHs). Therefore, based on lower pollutant discharge and higher bio-oil yield, the optimal pyrolysis temperature of BG11/8-10 was around 700°C. © 2017, Chinese Society of Agricultural Engineering. All rights reserved.


Zhang Y.,China Agricultural University | Wang X.,China Agricultural University | Hou T.,China Agricultural University | Liu H.,China Agricultural University | And 3 more authors.
Journal of Energy Chemistry | Year: 2017

Levulinate esters are versatile chemicals that have been used in various fields. Herein, the production of ethyl levulinate (EL) from corn stover was investigated under microwave irradiation. Several reaction parameters, including acid concentration, reaction temperature, reaction time, and liquid-to-solid mass ratio, were investigated to evaluate the reaction conditions. Response surface methodology (RSM) was employed to optimize the reaction conditions for the production of EL. A quadratic polynomial model was fitted to the data with an R 2 value of 0.93. The model validation results reflected a good fit between the experimental and predicted values. A high conversion yield (58.1mol%) was obtained at the optimum conditions of 190°C, 30.4min, 2.84wt% acid, and 15g/g liquid-to-solid mass ratio. Compared with conventional heating, microwave irradiation facilitated the conversion of corn stover to EL by dramatically shortening the reaction time from several hours to ∼30min. Thus, microwave-assisted conversion of corn stover to EL is an efficient way of utilizing a renewable biomass resource. © 2017 Elsevier Ltd.


Li G.,Beijing Technology and Business University | Xiang S.N.,China Agricultural Machinery Testing Center | Ji F.,Chinese Academy of Agricultural Sciences | Zhou Y.G.,China Agricultural University | And 2 more authors.
International Journal of Agricultural and Biological Engineering | Year: 2017

Qualitative and quantitative analyses of thermal cracking products from Desmodesmus sp. were performed based on pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS) at different temperature regimes (350°C-750°C). After further analysis of a series of total ions chromatogram (TIC) and summarized, thermal cracking products of Desmodesmus sp. at different temperature regimes can be obtained, which mainly comprised of aliphatic hydrocarbons, nitrogen compounds, aromatic hydrocarbons, fatty acids, ketones, alcohols, aldehydes and furan compounds. Compared to bio-oil production at 650°C (32.07%), Desmodesmus sp. pyrolyzed at 750°C could produce the highest bio-oil content of 42.25%. However, higher temperature could lead to the formation of contaminants (nitrogen compounds and PAHs) more easily. Therefore, considering the higher content of bio-oil conversion and less pollutants generation, the optimum temperature for Desmodesmus sp. thermal cracking conversion was about 650°C. © 2017, Chinese Society of Agricultural Engineering. All rights reserved.


Zhou Y.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Zhou Y.,China Agricultural University | Zhou Y.,National Energy Randnter for Biomass | Zhang Z.,Key Laboratory of Clean Production and Utilization of Renewable Energy | And 12 more authors.
Renewable and Sustainable Energy Reviews | Year: 2016

Biomass is a sustainable and renewable energy source with relatively low pollution emissions. It can be transformed into gaseous, liquid and/or solid biofuels as well as other raw chemical materials and products. Among the biomass conversion technologies, densified solid biofuel is one of the means that is storable and transportable with low heating cost. In order to achieve the target of reducing the amount of carbon dioxide emissions per unit of Gross Domestic Product (GDP) by 40-45% until 2020 as set at the United Nations Framework Convention on Climate Change (UNFCCC), and realize the goal of China's 12th Five-year Plan (2011-2015) for the development of biomass energy, given that carbon emissions will peak in 2030 as estimated in 2014 during Asia-Pacific Economic Cooperation Conference, China should vigorously develop densified solid biofuel, so as to sharply minimize the unorganized burning of crop residues. This paper introduces the current status of China's densified solid biofuel and the industry in following aspects: (a) the classification of densified solid biofuel; (b) development of densified solid biofuel industry; (c) molding technology of densified solid biofuel; (d) characteristics of densified solid biofuel combustion; (e) the problems faced during molding, handling, transportation and storage; (f) existing Chinese standards for densified solid biofuel and the assessment of densified solid biofuel; and (g) market analysis and perspectives of densified solid biofuel and the industry. Moreover, this study provides a comprehensive overview of the development of China's densified solid biofuel and the related industry, proposes some recommendations for further development of the industry for domestic and international biomass energy researchers as well. © 2015 Elsevier Ltd. All rights reserved.


Ji F.,China Agricultural University | Ji F.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Liu Y.,China Agricultural University | Liu Y.,Key Laboratory of Clean Production and Utilization of Renewable Energy | And 7 more authors.
Bioresource Technology | Year: 2014

Anaerobic digestion wastewater (ADW), which contains large amount of nitrogen and phosphorus, particularly high concentration of ammonium, might lead to severely environmental pollution. A new unicellular green microalgae species from a wetland at the Olympic Forest Park, Beijing, China was screened based on its growth rates and nutrients removal capability under ADW. Results of 18s rDNA and ITS1 analysis indicated that this strain have a close relationship with Desmodesmus sp., named as EJ9-6. Desmodesmus sp. EJ9-6 could remove 100% NH4-N (68.691mg/L), TP (4.565mg/L) and PO4-P (4.053mg/L), and 75.50% TN (84.236mg/L) at 10.0% ADW, which the highest biomass production was 0.412g/L after 14d cultivation. Maximum nutrients removal was observed at 10.0% ADW with daily removal rates of TN, NH4-N, TP and PO4-P at 4.542, 5.284, 0.326 and 0.290mg/L/d, respectively. © 2014 Elsevier Ltd.


Ji F.,China Agricultural University | Ji F.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Hao R.,China Agricultural University | Liu Y.,China Agricultural University | And 7 more authors.
Bioresource Technology | Year: 2013

A novel strain of unicellular green algae was isolated from fresh water samples collected from Yesanpo National Geopark, Laishui County of Hebei Province, China. The morphological and genomic identification of this strain was carried out using 18. s rRNA analysis. This novel strain was identified as Desmodesmus sp. named as EJ15-2.Environmental factors for biomass production of Desmodesmus sp. EJ15-2 grown under autotrophic condition (BG11 medium) was optimized using response surface methodology (RSM). A high correlation coefficient (R2=0.923, p≤0.01) indicated the adaptability of the second-order equation matched well with the growth condition of this strain. The optimal conditions for a relatively high biomass production (up to 0.758g/L) were at 30°C, 98μmol/m2/s and 14:10 (L:D), respectively. © 2013 Elsevier Ltd.


Li G.,China Agricultural University | Li G.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Zhou Y.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Zhou Y.,China Agricultural University | And 9 more authors.
Energies | Year: 2013

Pyrolysis-gas chromatographic mass spectrometry (Py-GC/MS) was used to determine the yield and chemical composition of the pyrolysis products of Schizochytrium limacinum. The pyrolysis was carried out by varying the temperature from 300 °C to 800 °C. It was found that the main decomposition temperature of Schizochytrium limacinum was 428.16 °C, at which up to 66.5% of the mass was lost. A further 18.7% mass loss then occurred in a relatively slow pace until 760.2 °C due to complete decomposition of the ash content of Schizochytrium limacinum. The pyrolysis of Schizochytrium limacinum at 700 °C produced the maximum yield (67.7%) of pyrolysis products compared to 61.2% at 400 °C. While pollutants released at 700 °C (12.3%) was much higher than that of 400 °C (2.1%). Higher temperature will lead to more pollutant (nitrogen compounds and PAHs) release,which is harmful to the environment. Considering the reasonably high yield and minimum release of pollutants, a lower pyrolysis temperature (400 °C) was found to be optimum for producing biofuel from Schizochytrium limacinum. © 2013 by the authors.


Ji F.,China Agricultural University | Ji F.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Zhou Y.,China Agricultural University | Zhou Y.,Key Laboratory of Clean Production and Utilization of Renewable Energy | And 10 more authors.
Bioresource Technology | Year: 2015

Desmodesmus sp. was used in anaerobically digested wastewater (ADW) for nutrients removal and the biodiesel production was measured and compared using fed-batch cultivation was investigated and compared with batch cultivation. The Desmodesmus sp. was able to remove 236.143, 268.238 and 6.427mg/L of TN, NH4-N and PO4-P respectively after 40d of fed-batch cultivation, while in batch cultivation the quantities of TN, NH4-N and PO4-P removed were 33.331, 37.227 and 1.323mg/L. Biomass production of Desmodesmus sp. was also enhanced in fed-batch cultivation, when ADW loading was carried out every 2days; the biomass concentration peaked at 1.039g/L, which was three times higher than that obtained in batch cultivation (0.385g/L). The highest lipid production (261.8mg/L) was also recorded in fed-batch cultivation as compared to batch cultivation (83.3mg/L). Fed-batch cultivation of Desmodesmus sp. could provide effective control of nutrients limitation and/or ammonia inhibition on microalgae cultivation. © 2014 Elsevier Ltd.


Zhou Y.,China Agricultural University | Hao C.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Mao Z.,COFCO
American Society of Agricultural and Biological Engineers Annual International Meeting 2014, ASABE 2014 | Year: 2014

This study investigated the thermal properties curve, the change trend of peak temperature and heat flow of Chlorella pyrenoidosa protein by optimizing the extraction effect in different ultrasonic time, ultrasonic power and solid-to-liquid ratios. Results showed that the moisture content (dry basis) of dehydrated Chlorella pyrenoidosa for elemental analysis was 4.06%, major element contents including carbon, hydrogen, and nitrogen element was obtained as 46.03%, 6.41%, and 8.48%, respectively. The decomposition temperature of Chlorella pyrenoidosa was 294.53°C, while another decomposition peak point at 642.64°C and 8.475% of residue remained finally. Ultrasonic extraction for protein has a high efficiency and good effect. By analyzing the characteristic curve of Chlorella pyrenoidosa protein, some conclusions had been reached. (1) With the increasing of temperature, the peak temperature was decreased at first and then increased. The heat flow was relativeky stable. However, with the increasing of ultrasonic time, the stability of heat flow was changed because of the degeneration that may occur in the process extraction. (2) With the increasing of temperature, the peak temperature was decreased at first and then increased. The heat flow was volatile. However, high ultrasonic power is helpful to shorten the time of ultrasonic. (3) With the decreasing of solid-to-liquid ratio, the peak temperature was decreased at first and then increased. The heat flow was stable.


Xiao W.,China Agricultural University | Xiao W.,Key Laboratory of Clean Production and Utilization of Renewable Energy | Chen X.,China Agricultural University | Zhang Y.,China Agricultural University | And 2 more authors.
Energy and Fuels | Year: 2016

The microwave-assisted methanolysis products from lignocellulose were analyzed with gas chromatography/mass spectrometry. Methyl levulinate (ML) and levoglucosenone derived from cellulose and furfural derived from hemicellulose were identified as the dominant compounds in corn stover methanolysis products. Only ML was revealed to accumulate rapidly over time in the methanolysis of cellulose and corn stover. The ML yields ranged from 34.9 to 84.5 mol % depending upon the starting materials varied among glucose, fructose, sucrose, cellulose, and corn stover. As a consequence of microwave dielectric heating, the ML yields from saccharides were increased significantly by 1.2-13.2 times compared to conventional heating. The results indicate that microwave-assisted methanolysis is a promising technology for the utilization of lignocellulosic materials. © 2016 American Chemical Society.

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