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通过对玉米秆、小麦秆、棉花秆、稻草、松木屑等生物质进行热重分析和差热分析,分析了生物质气化过程的裂解机理。研究中采用松木屑作为气化原料,得出了气化温度、压力、水蒸气加入量等反应条件对气化产物的产率、组成成分及焦油产率的影响规律,研究结果表明,温度对生物质气化的影响最大,当温度为800℃时气体的产率最高。 相似文献
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生物质流态化催化气化技术工程化研究 总被引:16,自引:0,他引:16
在研究开发的内循环锥形流态化气化炉内。对稻草、麦草等软秸秆物料粉碎后,或者直接使用木屑等细粉状原料,进行了热解气化和催化气化的工程化应用试验研究。研究结果表明:气化反应在600—820℃的一个较宽温度范围内,均能稳定连续运行。麦草原料气化所产生的煤气热值比稻草和稻壳都高,其热值可达7716kJ/m^3。木屑气化所产生煤气热值最高则达9064kJ/m^3,远远高于一般生物质气化煤气。对流化床气化来讲,即使在非催化气化条件下,其气化产生的煤气热值比采用下吸式气化炉产生的煤气热值提高40%左右,并且气化温度较固定床(上吸式、下吸式)气化炉低。同时进行的催化气化试验发现,催化剂CaO能明显提高煤气热值、降低CO组分,Na2CO3催化气化能提高气体H2的含量。在800℃试验时,添加催化剂能明显提高气体的热值。 相似文献
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中科院广州能源研究所承担的“十五”863项目“生物质气化发电优化系统及其示范工程”,目前已取得阶段性成果.开发出适合我国国情的生物质中小型气化发电系统。采用循环流化床气化炉和多级气化净化装置。配置多台200-400kW的单气体燃料内燃发电机组,用谷壳、木屑、稻草等多种生物质作原料,可以在不同的负荷下运行。 相似文献
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在自行搭建的固定床上试验研究了不同粒径的印刷线路板在CO2气氛、不同温度下的气化特性实验。利用热重分析仪分析了不同升温速率时印刷线路板的气化特性。结果表明:随着升温速率增大,失重曲线向高温区移动;在300℃~380℃温度区间,气化反应剧烈进行。同时反应物颗粒尺寸以及气化终止温度都会对气化产物产生影响。 相似文献
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由中科院广州能源研究所承担的国家“十五”期间863项目的生物质气化发电优化系统及其示范工程.已开发出适合我国国情的生物质中小型气化发电系统。该技术采用CFB气化炉和多级气体净化装置,配置多台200~400kW的气体燃料内燃发电机组,用谷壳木屑、稻草等多种生物质作原料来发电。 相似文献
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由中科院广州能源研究所承担的国家“十五”863项目“生物质气化发电优化系统及其示范工程”,已开发出适合我国国情的生物质中小型气化发电系统。该技术采用CFB气化炉和多级气体净化装置,配置多台200-400kW的气体燃料内燃发电机组用谷壳、木屑、稻草等多种生物质作原料来发电。 相似文献
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试验研究了木屑在水蒸气气氛下的热失重行为及气化过程中合成气释放特性。首先采用TG-DTA对木屑样品进行了水蒸气气氛下的热重行为分析,结果表明,木屑气化过程可以分为挥发分释放和半焦气化两个阶段,分别可由二级反应动力学和三维扩散Ginstling-Broushtein方程描述,对应的表观活化能分别为87.014kJ/mol和103.35 kJ/mol。此外,在自制的固定床气化反应装置上,研究了生物质气化过程中挥发分释放和半焦气化阶段合成气释放特性。另外,半焦水蒸气气化阶段对气体中合成气含量和H2/CO起到决定性作用,通过合理调控半焦气化阶段反应条件,可以得到合适化学当量比的生物质合成气。 相似文献
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Experimental study on cogasification mechanisms of straw and kitchen waste in the fixed-bed gasifier
Yongfeng Qi Xiaowei Shan Meiting Wang Lingzhi Zhao Panle Ge Jiang Wu 《国际能源研究杂志》2020,44(11):8578-8590
The cogasification experiments were carried out by an electric fixed-bed gasifier to explore the cooperative gasification mechanisms of straw and kitchen waste. The effects of temperature, equivalence ratio as well as mixing ratio of straw and kitchen waste containing rice and trench oil on the gasification behaviors were investigated, combining the characterizations with SEM and FTIR. The results showed that the CH4 release volume fraction of single trench oil could up to 90%, as for the mixtures of straw, rice, and trench oil, the rapid reaction of oil could increase the gasification temperature, promote the bond fractures of CC and C H. Thereby those fractured matters could combine CO and H2 to generate CH4, which consequently improved the gas quality from straw gasification. As the equivalence ratio being 0.1 at 800°C, the actual calorific value of released gaseous from the mixture of straw, rice, and oil was at least 26% higher than the theoretical weighting value. When the mass ratio of straw, oil, and rice was 2:0.5:0.5, that superiority even reached 49.31%. Furthermore, in another fixed-bed gasifier without external heating, the mixture of sun-dried straw and actual kitchen waste containing much water could still achieve continuous gasification, and the experimental phenomena were similar to those above with the electric fixed-bed gasifier. The real calorific value of the mixture of straw and kitchen waste was still higher than the theoretical weighting value. 相似文献
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Kung-Yuh Chiang Yun-Xi LinCheng-Han Lu Kuang-Li ChienMing-Hui Lin Chih-Chao WuShan-Shin Ton Jiann-Long Chen 《International Journal of Hydrogen Energy》2013
This study investigated the feasibility of gasification of rice straw using an Fe/Mn sludge as a catalyst. The Fe/Mn sludge contained iron and manganese compounds produced from a water purification plant. The gasification temperature and equivalent ratio (ER) was set at 900 °C and 0.30, respectively, with an amended catalyst ratio of 0%–15%. Experimental results indicated that the combustible gas production was increased from 0.61 m3/kg to 0.72 m3/kg with the Fe/Mn sludge addition. The lower heating value (LHV) of combustible gas and energy density (ED) were also increased with an increase in Fe/Mn sludge addition. The LHV and ED increased from 14.76 MJ/Nm3 to 15.82 MJ/Nm3 and from 1.37 MJ/MJ to 1.47 MJ/MJ, respectively. In conclusion, the catalytic gasification of rice straw was more efficient on an energy yield basis with the Fe/Mn sludge addition. The Fe/Mn sludge used in this research has been developed as a potential catalyst for the application of rice straw gasification. 相似文献
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生物质中热值气化装置设计与运行 总被引:5,自引:2,他引:5
从富氧气化的原理和特点出发,根据空气化的结果,讨论说明中热值气化装置的设计依据和参数计算方法,在试验运行的基础上,分析采用富样气化的中热值气化装置的优缺点,通过分析和试验表明,采用90%的富氧气化具有较理想的效果,其气体热值在10-12MJ/m^3之间,气化效率在70%以上,单位燃气的耗电量约0.075kWh/Nm^3,具有较好的经济性和实用性。 相似文献
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某电厂生物质气化耦合燃煤机组发电项目于2018年9月8日完成72 h满负荷试运,项目主体是循环流化床气化耦合系统及附属设备,为评价该耦合系统的综合性能,进行了额定负荷下的产气率、气化效率、热效率及对燃煤机组煤耗影响等性能试验。试验结果表明:额定负荷下,生物质气化耦合系统以50%稻壳+50%秸秆作为原料时,燃料量为8. 61 t/h,产气率为2. 09 m~3/kg,气化效率为70. 53%,热效率为87. 65%;以100%稻壳作为原料时,燃料量为8. 57 t/h,产气率为2. 15 m~3/kg,气化效率为70. 04%,热效率为88. 12%;气化耦合系统在75%~110%负荷范围内可稳定运行;气化耦合系统额定负荷、燃煤机组维持600 MW负荷的情况下,投运气化耦合系统后,减少标煤量3 291 kg/h;气化耦合系统额定负荷、燃煤机组维持500 MW负荷的情况下,投运气化耦合系统后,减少标煤量3 122 kg/h。 相似文献
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The current paper concerns the process of non-woody biomass gasification, particularly about releasing processes of detrimental elements. The gasification of corn straw was carried out in a downdraft fixed bed gasifier under atmospheric pressure, using air as an oxidizer. The effects of the operating conditions on gasification performance in terms of the temperature profiles of the gasifier, the composition distribution of the producer gas and the release of sulphur and chlorine compounds during gasification of corn straw were investigated. Besides, the gasification characteristics were evaluated in terms of low heating value (LHV), gas yield, gasification efficiency and tar concentration in the raw gas. 相似文献
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《International Journal of Hydrogen Energy》2020,45(38):19027-19044
A combined plant including a fluidized bed gasifier, a gas turbine, a domestic heat recovery, and heat pipes was proposed and investigated from the first and the second thermodynamic laws and environmental viewpoints. Two types of biomass (wheat straw and rice straw) were fed to the gasifier. A zero-dimensional model was validated against results available in the literature. Gibbs free energy minimization and Lagrange method of undetermined multipliers methods were utilized to obtain the unknown parameters. Effects of steam to biomass ratio of the steam biomass gasification, inlet turbine temperature, and compression ratio were investigated on the plant performances. Analysis of variance results and Pareto chart of the standardized effects were carried out for net power, total exergy efficiency, and carbon dioxide emission of the combined plant. The plant was optimized using response surface methodology. The results indicated that the compression ratio was the most effective parameter and the plant performance was enhanced by increasing the compression ratio. Wheat straw had better performance in comparison with rice straw. Increasing steam to biomass ratio improved the hydrogen production and decreased the cold gas efficiency. Net power was on maximum value at steam to biomass ratio of 1.0, inlet turbine temperature of 1173–1217 K, and compression ratio of 11–12. 相似文献
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《International Journal of Hydrogen Energy》2019,44(51):27726-27740
A system based a fluidized bed gasifier with steam as a gasifying agent is investigated in details. Comparing the synthesis of gas compositions with experimental data available in the literature is used to validate the model. The synthesis of gas composition and efficiencies of the system is investigated respect to different biomasses considered as gasification fuels. The results indicate that the molar fractions of hydrogen and carbon dioxide are increased and the molar fraction of carbon monoxide is reduced with steam to biomass ratio (STBR). The hydrogen and cold gas efficiencies are improved with decreasing STBR. Hydrogen, cold gas, and exergy efficiencies are enhanced with temperature. The results illuminate that pine sawdust and straw have the highest hydrogen production and legume straw produces the lowest CO molar fraction. Straw has the highest hydrogen efficiency, eucalyptus and straw have the highest cold gas efficiency, and eucalyptus has the highest exergy efficiency. A systematical analytical hierarchy process (AHP)/technique for order preferences by similarity to ideal solution (TOPSIS) couple method are utilized to select the best alternative. The results illuminate that eucalyptus, straw, and pine sawdust are the best candidates, respectively as gasification fuel based on the considered criteria. 相似文献