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焦炉气气氛下煤加氢热解研究进展 总被引:6,自引:3,他引:6
煤-焦炉气共热解是力图降低传统煤加氢热解工艺投资和工业运转 和的新工艺,近年来已引起人们广泛注意。本文平述了近期国内外利用焦炉气代替氢气作煤加氢热解反应气工艺的可行性以及热解温度和焦炉气组分对热角产品影响方面的研究进展。 相似文献
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煤—焦炉气共热解特性及其增油减水方法研究 总被引:1,自引:1,他引:0
介绍了一种实现煤高产,洁净利用新途径-煤-焦炉气共热解的工艺过程,经济技术评价,应用前景以及近期研究结果,在实验的基础上,进一步证实了用焦炉气代替纯氢进行加氢热解的可行性及优越性,固定床热解实验及产品分析结果表明,与相同氢分压下的加氢热解相比,煤-焦炉共热解半焦和焦油收率以及脱硫率的均有所增加,而且焦油质量明显改善,但水分也有所增加,在煤-焦炉气共解中添加少量废塑料可达到增加焦油收率降低热解水分的 相似文献
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结合煤加氢热解最新研究进展,从煤加氢热解焦油形成机理出发,综合论述了提高热解焦油产量的6条途径和方法。提出煤-焦炉气催化加氢热解的新构想,以期实现“煤→热解煤气内循环→焦油”新工艺。 相似文献
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为推动煤催化热解技术的发展,论述了金属类催化剂、负载类催化剂和煤基催化剂的催化机理及其对煤热解转化特性、产物分布的影响。根据催化机理不同,将煤催化热解工艺分为直接催化热解工艺、间接催化热解工艺和热解产物催化热解工艺,并论述了各工艺的研究现状。过渡金属、分子筛可改变低阶煤热解产物分布,提高焦油产率;金属氧化物催化剂可提高热解转化率,调节气体产品分布,提高气相产品收率。液化残渣与褐煤共热解降低了活泼分解阶段的反应活化能,加快了反应速率,提高热解焦油产率,影响气相产物分布。首次提出煤直接液化残渣与煤混合热解所产生的正协同作用也可看成是一种对煤热解的正向催化。 相似文献
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工艺条件对煤—废塑料在焦炉气气氛下共热解特性的影响 总被引:4,自引:1,他引:3
将先锋褐煤与5%聚乙烯(PE)混合加入10g固定床反应器中通入焦炉煤气在不同压力、升温速率及终态温度下共热解。结果表明,在实验压力范围内(0.1MPa ̄3MPa)添加废塑料可实现煤-焦炉气常压热解达到甚至超过高压(3MPa)下不加PE时热解的焦油收率,同时增加半焦收率,明显降低热解水分。降低升温速率可明显增加焦油收率,降低水分。添加废塑料还可实现煤-焦炉气低温热解达到甚至超过高温热解时的焦油收率, 相似文献
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介绍了焦炉气常压非催化转化工艺控制系统及控制方案,特别是焦炉气与蒸汽的比值调节程序结合串级调节的控制思路,使焦炉气常压非催化转化工艺易于控制和实现,控制手段先进,方法可靠,在同行业及相关行业值得推广. 相似文献
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介绍了我国无烟煤、贫煤、不黏煤和长焰煤等非炼焦煤的性质及在炼焦生产中的应用情况。利用非炼焦煤代替部分焦煤炼焦,成本优势十分明显,既可缓解焦煤资源不足的压力,还能优化我国煤炭资源的利用。 相似文献
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Steps are now being taken to define in more detail the phenomenology of coal liquefaction and to provide a scientific basis for empirical correlations previously established between liquefaction conversion and basic compositional characteristics of coals. The rates of production of oils, asphaltenes and preaphaltenes have been determined at four temperatures for three coals, two of Carboniferous and one of Creaceousage. Products are formed more slowly from the younger coal (which is of slightly lower rank) than from the others, but oxygen, partly as OH but probably mostly in a type of ether, is lost more rapidly. It is estimated that the maximum content of O as cleavable ether is 7.7 atoms/100 C atoms for the younger coal (from Wyoming) and 4.1 and 5.1 for the other two (from Oklahoma and Ohio, respectively). Until ≈ 50% of the amount present in the Oklahoma coal is lost, the rates of removal of oxygen and organic sulphur are approximately equal; beyond this level, the removal of S is more rapid. The loss of organic sulphur from the Ohio coal is slightly faster. Even so, the data do not support the idea that cleavage of thioethers is more rapid than that of ethers and that this is the basic reason why a high organic sulphur content tends to promote liquefaction. Conversion of the pyrite in the Ohio coal to pyrrhotite occurs considerably more rapidly than the pyrite in the Oklahoma coal. In preliminary experiments, it is shown that a curve-resolving programme allows two aromatic and five aliphatic C-H stretching vibrations to be distinguished in FTIR spectra of the hexane-insoluble products, and the distribution changes with degree of conversion. In particular, there is evidence that new aryl methyl are generated during liquefaction, in agreement with evidence from oxidation studies. 相似文献
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在融碱法和高压液减法脱灰的基础上,研究了煤的常压液碱法脱灰。考察了碱煤比、反应温度、时间、粒度组成等对两种煤脱灰的影响,并对脱灰机理作了初步分析。 相似文献
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大同侏罗纪10—11#煤煤质特征及其控制因素 总被引:1,自引:0,他引:1
研究了大同10-11#煤的变质程度和煤岩特征,指出高含量的丝质组是大同10-11#煤最主要的煤岩特征,分析了大同10-11#煤煤类、化学和工艺性质与其沉积环境和变质程度的关系,探讨了大同10-11#煤煤质特征及其成因因素,提出了煤炭分选技术是扩大大同煤利用途径的有效手段,为大同煤的合理利用提供了理论基础。 相似文献
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The e.p.r. and i.r. spectra of hand-picked samples of calcite from Pittsburgh No. 8 coal, show that it contains the Mn2+ paramagnetic ion and clay minerals as impurities. Furthermore, comparison of the e.p.r. spectra of hand-picked and natural calcite shows that the Mn2+ spectrum in this coal originates from calcite, which when diluted in KBr or coal produces a spectrum similar to that reported by other investigators. The results obtained when coal-derived calcite was treated with dilute H2SO4 and HCI rules out the possibility that the Mn2+ originates from the pyrite or clays present in the coal. 相似文献
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国内煤化工的现状及发展 总被引:2,自引:0,他引:2
介绍了国内煤化工行业的现状,详细介绍了煤制油、煤制烯烃、煤制天然气、煤制乙二醇、煤制芳烃项日的技术、经济情况,指出通过开发下游产品,合理利用CO2来改善产品单一、节能减排压力大问题。 相似文献
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