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考察了空气氛围下热解温度、空气流量、升温速率等因素对紫茎泽兰茎干气化特性的影响。试验结果表明,热解温度的提高有利于H2含量的增加,CO、CH4、C2H4含量则随着热解温度的上升而下降;空气流量的增加有利于CO含量的增加,H2、CO2、CH4、C2H4含量由于空气的引进均出现下降现象,在5—10mL/min范围内,燃气组分变化幅度最大;升温速率的增加有利于CH4和CO2含量的上升,H2含量先下降后上升,CO含量则是先升后降。热解温度和空气流量上升均不利于燃气热值的提高,而升温速率增加燃气热值提高。 相似文献
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水合物法净化酸性天然气的工艺探讨 总被引:1,自引:0,他引:1
天然气中H2S、CO2、有机硫化合物等酸性组分的存在,不仅会造成金属腐蚀、环境污染,还会影响天然气的输送、加工和使用。对酸性天然气进行净化处理,使其满足商品气或管输气的质量要求,是天然气资源利用的一个重要环节。气体水合物相平衡研究表明,单组分CH4、CO2、H2S气体及(CH4+H2S+CO2)三元体系在纯水中生成水合物的条件存在显著差异,可利用水合物的生成过程逐一脱除酸性天然气中的H2S和CO2。基于此,提出了一种利用水合分离技术处理酸性天然气的新工艺,以优化流程、降低能耗、提高酸性组分的脱除效率。 相似文献
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天然气中微量组分对吸附剂性能的影响 总被引:4,自引:0,他引:4
考察了天然气吸附剂LXC对天然气中微量组分C2H6,C3H8,CO2,N2的吸附和脱附特性及其对CH4吸附能力的影响。实验结果表明,天然气吸附剂LXC吸附CH4,C2H6,C3H8的吸附量依次增大,滞留比依次减小,不可逆吸附性增强;CO2在吸附剂上的吸附量和滞留量较大;N2的可逆吸附与脱附性能较好;天然气中C2H6,C3H8,CO2均能导致吸附剂LXC吸附CH4的能力降低。在20℃、充气压力3.5M Pa、放气压力0.1M Pa的条件下,吸附剂LXC对配制的混合气体经12次连续吸脱附后,其吸附能力下降27.5%。 相似文献
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甲烷二氧化碳重整热力学分析 总被引:1,自引:1,他引:0
为了优化反应条件及提高催化剂的反应效率,采用平衡常数法对甲烷二氧化碳重整制合成气进行了热力学分析,计算出该反应发生的最低可行温度为914K。研究了反应温度、压力及反应原料进气组成对重整特性的影响。结果表明,温度在1 123K和常压下,CH4和CO2的转化率可分别达到94.47%和97.31%,且温度升高有利于转化率的提高,而压力升高却不利于反应正向进行。随着原料气中n(CH4)/n(CO2)比值的增加,CH4和CO2转化率呈现单调但相反的变化趋势,当n(CH4)/n(CO2)=1.2时,CO2的转化率可达99.29%,n(H2)/n(CO)为0.99。O2含量增加,使CH4和CO2转化率分别升高和降低,且使n(H2)/n(CO)的值增加;当n(CH4)∶n(CO2)∶n(O2)=1.2∶1∶0.575时,能使反应实现自热。 相似文献
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《中国石化文摘》2005,(6)
TQ013.1200506430CO2/DME/CH3OH和CO2/DME/C2H5OH体系的汽液相平衡研究〔刊〕/曹文,郑丹星(北京化工大学化学工程学院)∥北京化工大学学报.-2004,31(5).-1~5基于对CO2/DME(二甲醚),DME/CH3OH,CO2/CH3OH和DME/C2H5OH体系汽液相平衡研究的文献调查,用Gibbs-Duhems方程对实验数据做动力学一致性检验和热力学模型评价。研究表明,PR-NRTL模型组合对四个体系都有良好的表现。进而基于通过检验的二元体系数据拟合了5个组合的NRTL模型的交叉作用参数,并以该模型研究了CO2/DME/CH3OH和CO2/DME/C2H5OH两个三元体系。计… 相似文献
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采用浸渍法制备了Fe-Co-K/SiO2催化剂,在连续流动固定床反应器上考察了反应温度、反应压力、重时空速和n(H2)∶n(CO)对该催化剂催化Fischer-Tropsch合成反应性能的影响。实验结果表明,随反应温度的升高,催化剂的活性提高,CO转化率和CH4选择性增大,重质烃(C 5+)选择性减小;升高反应压力有利于提高CO转化率和重质烃选择性;增大重时空速不利于重质烃的生成,同时CO转化率减小,CH4选择性增大;随n(H2)∶n(CO)的增大,CO转化率和CH4选择性增大,重质烃选择性减小。Fe-Co-K/SiO2催化剂用于Fischer-Tropsch合成反应较适宜的工艺条件为:反应温度503~513 K、反应压力1.5 MPa、重时空速600~800 h-1、n(H2)∶n(CO)=2.00。 相似文献
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在活塞流式微分反应器和脉冲微型反应器中,反应温度550~750℃,分别通过连续反应和脉冲反应,考察了Ni/α-Al2O3催化剂上CH4/CO2反应的动力学行为.结果表明,在550~600℃,原料气CH4和CO2的反应级数随温度升高而增大,产物CO的反应级数随温度提高而提高,H2的反应级数随温度升高而降低.在650~750℃,原料气CH4的反应级数随温度的升高略有增加,而CO2的反应级数恒定,产物H2不再影响反应速率,产物CO反应级数随温度升高几乎恒定.并且发现以上两个温度区间的CH4/CO2反应的表观活化能有显著不同,表明Ni/α-Al2O3催化剂上CH4/CO2重整的反应历程在650℃左右发生了明显变化. 相似文献
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四川盆地东北部飞仙关组储层流体包裹体特征 总被引:1,自引:0,他引:1
四川盆地东北部下三叠统飞仙关组鲕滩气藏储层成岩矿物中的流体包裹体主要有盐水溶液包裹体、含烃包裹体和烃类包裹体3大类.拉曼光谱成分测试表明,气相烃类包裹体以含CH4为主,平均含量为82.94%;H2S平均含量为7.29%,但H2S含量变化较大,为2.17%~13.08%,包裹体中的H2S平均含量较现今气藏低一些,且变化范围更大,为气藏不同演化阶段所捕获.含烃气液两相包裹体中H2O、CH4和H2S的含量变化都比较大,为盐水溶液和天然气在不混溶条件下捕获.高含H2S的含烃包裹体和气态烃包裹体基本不合CO2,这一现象与TSR反应产生CO2和H2S,CO2参与储层溶蚀作用而被大量消耗有关.CO2参与储层溶蚀作用,碳酸盐沉淀作用加强,白云石、方解石在孔隙及裂缝中结晶沉淀,并捕获以含CH4和H2S为主、不含或微含CO2的包裹体,因此川东北飞仙关组气藏具有CO2含量相对H2S显著亏损的特征. 相似文献
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Sunggyu Lee Vetkav R. Parameswaran Irving Wender Conrad J. Kulik 《Petroleum Science and Technology》1989,7(8):1021-1057
The roles played by carbon dioxide in the chemistry of methanol synthesis over CuO/ZnO/A12O3 catalysts have been experimentally investigated. It was concluded based on reaction rate measurements and thermodynamic considerations, that the two reactions that best describe the chemical system of methanol synthesis are the CO2-hydrogenation and water-gas shift reactions. It was also found experimentally that the presence of CO2 is vital for maintaining the catalytic activity. The significance of the study is enhanced by the fact that this was the first such investigation of the global chemistry of methanol synthesis to be based on the novel liquid phase process. It was also observed that the rates of methanol synthesis attained a maximum when the concentration of carbon dioxide in the reactor feed was controlled at a certain optimal value. The optimal CO2 content was found to be a function of the operating temperature and syngas composition. The experimental data are especially important because the apparatus and the operating conditions have been well-defined and carefully chosen to closely simulate industrial reactors. 相似文献
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铜基催化剂上富二氧化碳合成气制甲醇的研究 总被引:3,自引:0,他引:3
采用两步共沉淀法制备了一种铜基催化剂,在微反装置上评价了反应条件对其催化富CO2合成气合成甲醇反应的影响。结果表明,随温度升高,CO转化率和甲醇时空收率都出现一个极大值,而CO2转化率呈上升趋势;在实验允许的范围内,增大压力是提高CO和CO2转化率和甲醇时空收率的有效手段;提高原料入塔气中H2含量,可提高CO和CO2的转化率,但甲醇时空收率下降;提高空速,可提高甲醇时空收率,但CO和CO2转化率下降。 相似文献
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Sunggyu Lee Vetkav R. Parameswaran Irving Wender Conrad J. Kulik 《Petroleum Science and Technology》2013,31(8):1021-1057
ABSTRACT The roles played by carbon dioxide in the chemistry of methanol synthesis over CuO/ZnO/A12O3 catalysts have been experimentally investigated. It was concluded based on reaction rate measurements and thermodynamic considerations, that the two reactions that best describe the chemical system of methanol synthesis are the CO2-hydrogenation and water-gas shift reactions. It was also found experimentally that the presence of CO2 is vital for maintaining the catalytic activity. The significance of the study is enhanced by the fact that this was the first such investigation of the global chemistry of methanol synthesis to be based on the novel liquid phase process. It was also observed that the rates of methanol synthesis attained a maximum when the concentration of carbon dioxide in the reactor feed was controlled at a certain optimal value. The optimal CO2 content was found to be a function of the operating temperature and syngas composition. The experimental data are especially important because the apparatus and the operating conditions have been well-defined and carefully chosen to closely simulate industrial reactors. 相似文献
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The chemical equilibrium compositions and equilibrium constants of methanol synthesis reactions, starting from carbon monoxide, carbon dioxide and hydrogen, were studied experimentally at P=4.0-8. 6MPa and t = 220∼260°C. It was found that lower temperatures and higher pressures are favourable to chemical equilibria In the interested range of the synthesis reactions using low-pressure process, but the influence of temperature on Kp Is much larger than that of pressure. 相似文献