共查询到19条相似文献,搜索用时 625 毫秒
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1气化机组的特点及存在的问题 固定床秸秆气化机组主要由两部分组成,一是气化炉(主要指下吸式气化炉),进行秸秆的气化反应;二是净化设备,即对秸秆煤气进行冷却,并脱除煤气中焦油、灰分、硫化氢等物质。 由于下吸式气化炉气化煤气经过灰渣层,所以煤气灰分较多,但焦油含量较其它类型炉的低。灰分与焦油凝固在一起,常常堵塞输气管道和净化设备。由于下吸式气化炉采用固定炉排,所以气化炉气化能力低,限制了气化站的供气规模。 另外,气化炉在开炉时,排放大量含有焦油、一氧化碳的气体,造成严重的环境污染;在停炉时,还会… 相似文献
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以传统生物质(稻壳)与潜在生物质(毛竹)为实验原料,通过热重法对生物质热解特性进行研究,利用单元体气化炉研究催化剂对生物质气化特性的影响。结果显示:脱灰除去矿物质后,热解曲线向高温区移动,反应活性降低;加入碱金属离子后,半焦产率提高,热解向低温区移动,反应活性增强。加入碱金属离子后,气化合成气中Cx Hy浓度大幅增大,并随催化剂含量的增大而增大。气化过程中,CO浓度曲线出现两个明显峰区,加入催化剂使前峰区面积显著增大、前移。在催化剂作用下,毛竹、稻壳的热解、气化特性明显改善。 相似文献
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结合浙江省长兴市某大米加工厂800kW稻壳气化发电系统测试结果,对MW级生物质气化发电站的运行特性进行了详细分析,重点考察了气化温度、当量比和负荷对生物质流化床气化特性的影响,并对系统存在的问题进行了讨论。气化炉轴向温度分布表明:床内存在流化不充分现象;密相区温度与当量比和负荷(加料速率)变化密切相关(负荷不变,床温随当量比增加近似线性升高;当量比相同,较高负荷对应较低的床温)。燃气热值随气化温度升高而降低,负荷变化对其影响不大。当气化温度保持在700~800℃之间时,燃气热值基本稳定在5453~6407kJ/Nm3。原料水分对气化炉的运行也有重要影响:当原料水份低于15%,水分含量增加,有助于提高运行气化当量比,提高燃气品质和产气率;然而原料水分含量超过15%,气化炉温度将很难控制。 相似文献
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《能源学会志》2019,92(6):1977-1986
Energy can be extracted from biomass through gasification. The gasification process is influenced by the physico-chemical nature of the biomass selected for gasification. Ash content and composition of the biomasses are likely to affect the gasification process. Clinker formation in the reactor bed caused by melting and agglomeration of ashes will affect the gasification process in fluidised bed gasifiers. The agglomeration tendency of the biomass is examined by carrying out the Energy Dispersive X-ray Spectroscopy analysis on biomass ash to identify the presence of elements like potassium and sodium responsible for agglomeration. Experimental investigations on the gasification of coffee husk revealed that coffee husk is prone to agglomeration even though the hydrogen yield is more. However, gasification of saw dust is not vulnerable to agglomeration. Co-gasification of coffee husk with sawdust (which is less prone to agglomeration) is investigated experimentally. 相似文献
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生物质流化床燃烧/气化的烧结特性与机理综述 总被引:1,自引:0,他引:1
流化床燃烧/气化是生物质高效规模化能源利用的主要方式之一,由于生物质在较低温度下燃烧/气化时就容易发生床料烧结,影响了系统安全稳定运行,阻碍了能源利用效率的提高.系统地归纳了不同生物质在不同种类床料状态下燃烧/气化时烧结所需的特征温度,分析了生物质种类、碱金属含量、反应气氛与烧结温度之间的联系,结合相关研究,对生物质的烧结机理进行了分析和总结,对烧结温度预测方法和模型的优缺点进行了剖析和比较,对生物质燃烧/气化烧结机理进一步研究、预测模型的优化等提出了积极的建议,以期为相关研究的深入开展和生物质能规模化利用水平的提高提供有意义的参考. 相似文献
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The depletion of fossil fuels and the increasing environmental problems, make biomass energy a serious alternative resource of energy. Biomass gasification is one of the major biomass utilization technologies to produce high quality gas. In this paper, biomass gasification was performed in a self-designed fluidized bed. The main factors (equivalence ratio, bed temperature, added catalyst, steam) influenced the gasification process were studied in detail. The results showed that the combustible gas content and the heating value increased with the increase of the temperature, while the CO2 content decreased. The combustible gas content decreased with the increase of the equivalence ratio (ER), but CO2 content increased. At the same temperature and at different ratios of CaO (from 0 to 20%), H2 content was increased significantly, CO content was also increased, CH4 content increased slightly, but CO2 content was decreased. With the addition of steam at different temperature, the gas in combustible components increased, the content of H2 increased obviously. The growth rate was 50% increased. As the bed temperature increased, gas reforming reaction increased, the CO and CH4 content decreased, but CO2 and H2 content increased. 相似文献