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Dong Y.,Shandong University | Dong L.,Shandong University | Qiang N.,Shandong University | Jing Y.,Shandong University | Guo F.,Shandong Baichuan Tongchuang Energy Co.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2010

To settle the tar particle problem in eliminating tar from biomass gas by cyclone separator, the RSM model and DPM model were used to simulate three-dimensional strong rotating turbulent field in the cyclone separator. Contours of flow field in the cyclone separator were obtained, including dynamic pressure, turbulent kinetic energy, turbulence viscosity and velocity vector. The influence of the main factors in the cyclone separator on tar separating was analyzed. The results could provide reference for the improvement and optimization of the cyclone separator. Source


Guo F.,China University of Mining and Technology | Dong Y.,Shandong University | Dong Y.,Shandong Baichuan Tongchuang Energy Co. | Dong L.,Shandong Baichuan Tongchuang Energy Co. | Guo C.,China University of Mining and Technology
International Journal of Hydrogen Energy | Year: 2014

The main objective of this paper is to study the effect of design and operating parameters, mainly reactor geometry, equivalence ratio and biomass feeding rate, on the performance of the gasification process of biomass in a three air stage continuous fixed bed downdraft reactor. The gasification of corn straw was carried out in the gasifier under atmospheric pressure, using air as gasifying agent. The results demonstrated that due to the three stage of air supply, a high and uniform temperature was achieved in the oxidation and reduction zones for better tar cracking. The designing of both the air supply system and rotating grate avoided bridging and channeling. The gas composition and tar yield were affected by the parameters including equivalence ratio (ER) and biomass feeding rate. When biomass feeding rate was 7.5 kg/h and ER was 0.25-0.27, the product gas of the gasifier attained a good condition with lower heating value (LHV) about 5400 kJ/m3 and cold gas efficiency about 65%. An increase in equivalence ratio led to higher temperature which in turn resulted in lower tar yield which was only 0.52 g/Nm3 at ER = 0.32. Increasing biomass feeding rate led to higher biomass consumption rate and process temperature. However, excessively high feeding rate was unbeneficial for biomass gasification cracking and reforming reactions, which led to a decrease in H2 and CO concentrations and an increase in tar yield. When ER was 0.27, with an increase of biomass feeding rate from 5.8 kg/h to 9.3 kg/h, the lower heating value decreased from 5455.5 kJ/Nm3 to 5253.2 kJ/Nm 3 and tar yield increased from 0.82 g/Nm3 to 2.78 g/Nm3. © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. Source


Guo F.,Shandong University | Dong Y.,Shandong University | Jing Y.,Shandong Baichuan Tongchuang Energy Co. | Dong L.,Shandong Baichuan Tongchuang Energy Co.
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2012

According to the tar problem in biomass gas, chemical solvent condensate trapping way was used to make tar particles in the gas condense and deposit. Tar problem could be solved mostly in this way. In the experiment, three typical solvents were comparatively analyzed, and the best solvent was chosen. Then, relationship between flow rate of the best solvent and purification performance was studied. The results show that tar removal efficiency can reach up to 90% when the flow rute of the solvent is 250 L/h, also solvent loss will be less. Source


Guo F.,Shandong University | Dong Y.,Shandong University | Dong L.,Shandong Baichuan Tongchuang Energy Co. | Jing Y.,Shandong Baichuan Tongchuang Energy Co.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2011

By adapting gasification method, this paper conducts a gasification test on three kinds of herb residues, including Qiju Dihuang Wan, Liuwei Dihuang Wan, Xiangsha Yangwei Wan, of which the water contents were about 25 percent. Compared with corn stalk, the results showed that when the excess air coefficient was 1.1, all of the above three kinds of herb residues showed good gasification characters, with the calorific values above 5300 kJ/m3. The calorific value of Xiangsha Yangwei Wan residue was 5460 kJ/m3. Compared with corn stalk, herb residues produced more tar during the gasification process. When the excess air coefficient was 1.1, the tar content of the three herb residues was about 1000 mg/m3 and it kept decreasing with the increase of excess air coefficient. This experiment proves that these three kinds of herb residues have good gasification characters, providing a new method to the resource recovery of herb residues. Source


Guo F.,China University of Mining and Technology | Dong Y.,Shandong University | Fan P.,Shandong University | Lv Z.,Shandong University | And 2 more authors.
International Journal of Hydrogen Energy | Year: 2016

The kinetics of thermal decomposition of biomass tar was studied using phenol as a model compound under isothermal conditions by a two stage micro fluidized bed reactor. Calcined coal gangue and γ-Al2O3 were employed as catalyst, particularly gangue representing one type of catalyst for tar decomposition that prepared by the thermal conversion of inferior coal. The Friedman method and integral method were employed for the determination of kinetic parameters for forming H2 and CO by phenol decomposition. The results demonstrated that the activation energy for generating H2 was lower compared with CO, indicating that the reactions for forming H2 was easier in phenol decomposition. Higher activation energies for H2 and CO generating were obtained using gangue as catalyst, implying that the catalytic performance gangue was slightly lower toward phenol decomposition process due to the high content of SiO2 in gangue. © 2016 Hydrogen Energy Publications LLC. Source

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