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Yan G.-H.,Shandong University | Yan G.-H.,Shandong Academy of Sciences | Sun L.,Shandong Academy of Sciences | Sun F.-Z.,Shandong University | And 3 more authors.
Ranshao Kexue Yu Jishu/Journal of Combustion Science and Technology | Year: 2010

Distribution properties of pyrolysis products of corn stalk and rice husks under different reaction temperature and residence time were studied. The experiments prove that the mass ratio of liquid products was nearly 50% at 400°C. With the increase of reaction temperature, hydrocarbons further crack into small-molecule gases, and the ratio of permanent gases was above 55% at 800°C. The results show that the reaction temperature which is closely related to the compositions of permanent gases has a greater influence on pyrolysis products than residence time. With the increase of reaction temperature, the volume content of H2 rises sharply, while those of CO and CO2 both decrease obviously. Meanwhile, the volume content of CH4 increases slightly, especially when the temperature is lower than 500°C. And the highest volume content of light hydrocarbons achieves at about 500°C. As reaction temperature rises from 400°C to 500°C, the low heat value (LHV) of permanent gases increases from 11 MJ/m3 to 15 MJ/m3. When the temperature exceeds 500°C, the LHV of permanent gases changes gently within the range of 15-16.5 MJ/m3. Source


Yan G.,Shandong Academy of Sciences | Xu M.,Shandong Academy of Sciences | Xu C.,Shandong Academy of Sciences | Xiao Q.,Shandong Academy of Sciences | Sun R.,Key laboratory for biomass gasification technology of Shandong province
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2013

Tar is a kind of very harmful product during the biomass gasification process, and it is not considered in the conventional thermodynamic mathematical model because of its components complexity. In order to research the effect of operation condition on ingredients and tar content of the fuel gas, a thermodynamic mathematical model of biomass gasification process with tar was developed based on material balance, energy balance and chemical equilibrium, taking the influences of system heat loss and carbon partial conversion into account. It is well known that the number of identified tar components is more than 100, and the components of quality ratio more than 5% are benzene, toluene, phenol, dimethylbenzene, phenylethylene, naphthalene, and so on. According to the quality equal principle of the main tar components, tar was indicated as the imaginary material C6H6.2O0.2 in the thermodynamic mathematical model. The chemical reactions selected in the model were from the deoxidization process as the reaction rate was much slower than the oxidization reaction. The model was solved with Newton-Raphson method, which was validated in comparison with literature data. In addition, the developed model was used to study the operating conditions, such as air preheating temperature, air equivalence ratio (ER) and steam ratio, on gas components and tar content. The results indicated that, with the increase in air preheating temperature, the tar content was decreased but the low heat value (LHV) was increased. When ER was increased from 0.2 to 0.3, the tar content and the LHV were both decreased. As steam ratio was increased from 0 to 10%, the tar content was decreased and gasification efficiency was improved. The results might provide valuable references for low-tar and clean utilizations of biomass gasification. Source


Wang K.,Shandong Academy of Sciences | Wang K.,Key laboratory for biomass gasification technology of Shandong province | Jiang J.G.,Shandong Academy of Sciences | Sun R.F.,Shandong Academy of Sciences
Advanced Materials Research | Year: 2014

The pyrolysis characteristics for two types biomass material was tested at 230°~250°, and the pyrolysis product component was on-line analyzed by using moisture micro-detection teller, gas chromatograph-mass spectrometer computer and fourier transform infrared spectroscopy. Besides, two different algorithms were used to evaluate the test error. In addition, the generated tar gas was secondary decomposed at 800°. It is found that the tar was broken up completely, which increased the hydrogen content sharply in the pyrolysis gas. The test data shows that the heat value of cotton stalk improves better than that of the corn stalk after pyrolysis, so it is more suitable for cotton stalk than corn stalk to improve the value in use by means of low temperature pyrolysis technology. © (2014) Trans Tech Publications, Switzerland. Source


Fan X.,Key laboratory for biomass gasification technology of Shandong province | Xian J.,North China Electrical Power University | Chu L.,Key laboratory for biomass gasification technology of Shandong province | Yang L.,Key laboratory for biomass gasification technology of Shandong province
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2011

The results from biomass gasification in a pilot-scale (6 m tall×0.2 m internal diameter) air-blown circulating fluidized bed gasifier was tested and compared with bubbling fluidized bed gasifier. The results showed that the diameters of bed material in bubbling fluidized bed and circulating fluidized bed were different. The bubbling fluidized bed had a dense zone and bed material was homogeneous distribution in circulating fluidized bed. The temperature of the circulating fluidized bed was more uniform than bubbling fluidized bed. The carbon conversion rate, gasification efficiency and low gas heat value of circulating fluidized bed were larger than that of bubbling fluidized bed gasifier. Source


Guan H.,Shandong Academy of Sciences | Sun R.,Shandong Academy of Sciences | Yan G.,Shandong Academy of Sciences | Yan G.,Shandong University | And 3 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2010

Definition and characteristics of distributed combined cooling, heating and power system (CCHP) were briefly summarized. The principle of biomass gasification system was mainly introduced, and several application modes of CCHP based on biomass gasification (BGCCHP) were discussed. At last, the advantages and difficulties of developing BGCCHP in China were analyzed. BGCCHP could realize the cascade utilization of energy coming along with social, economic and environmental benefits and it is an efficient and comprehensive way for biomass resource exploitation and application. Source

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