本文主要研究内容
作者杨宁（2019）在《持液流化床中喷嘴雾化及颗粒团聚特性研究》一文中研究指出：中国天然气资源匮乏,原油普遍偏重,多年来一直希望将重质油直接作为低碳烯烃生产的裂解原料。伴随着石油加工技术提升和石油价格的上涨,超重质油和重质油在将来原油资源中供应增长是必然趋势,劣质原油的加工及高效利用成为我国面临的主要问题。流化焦化反应工艺以重质沥青烃为原料液,通过喷嘴以蒸汽的形式进行雾化并注入装有热态焦炭的流化床中,液相以非连续相的形式引入气固流化床。对于具有较高粘度的重质原料液体而言,喷嘴技术是进料技术的核心,雾化质量的优劣直接影响到原料液与焦炭颗粒接触的充分程度、反应效率、稳定性等,并且持液操作将显著影响流化床中焦炭颗粒的流体力学行为及流化稳定性,但液相的具体作用尚不明确,若引起颗粒的团聚,会导致床层崩塌,生产被迫停止。因此,为了提高裂化反应速率,降低反应所需的能耗,在保证进料喷嘴良好雾化质量的前提下,研究液相是如何影响气固流化床反应器中的流体力学行为及团聚结构流化稳定性具有重大理论意义和工业价值。本文围绕持液流化床喷嘴结构改进及雾化质量优化、持液流化床流体动力学多层次表征、和团聚结构检测识别及其离散破碎开展如下四个方面的研究工作:首先,选取工业中常用的两种类型喷嘴作为研究对象,采用重量分析法测量了持液流化床内团聚结构的尺寸分布特性,有效表征了不同类型喷嘴的射流混合效果;通过改进喷嘴上游混合器结构,消除了喷嘴雾化过程的液体脉动现象;加装气罩装置将雾化液滴推向射流外围,结合固体夹带装置创造的紊流环境促进了周向颗粒与液滴的充分混合;利用冲击锥体结构的圆锥体障碍物离散中心区域的雾化液滴,结合气罩装置产生气体空间有效抑制了射流液滴的再次聚合以及压缩。然后,在逐步提高液体含量的过程中,制造不同团聚结构流化状态,通过摄像法对持液流化床内气泡的形态及其向沟流转变的全过程进行了细致的观察与分析;结合压力信号测量技术,采用压力脉动信号标准差方法,有效的判断了持液流化床内颗粒的团聚、沟流等不良流化状态;从算法原理出发,综合利用功率谱分析、小波分析、相干分析和递归分析等信息处理技术从多层次建立适合表征持液流化床气泡行为的方法,揭示了流化床内气泡的增长、运动和数量随液体含量增加的变化规律。再后,选用水-沙系统模拟热态沥青-焦炭系统,通过连续的工质雾化实验,基于电导信号法测量雾化喷嘴注入多粘度液体的电导信号随射流时间的变化规律,研究多粘度液体注入过程雾化液滴与颗粒表面的接触效果;通过与空白实验(无粘实验)结果进行对比,研究液体粘度在不同气液比与气速条件下对于颗粒团聚特性的影响;在线监测不同流化阶段液体射流在床层进行扩散过程的颗粒团聚现象,为多粘度液体注入过程颗粒团聚现象的在线监测提供了一种新方法,确保了持液流化床内雾化液滴与颗粒表面的良好接触;最后,控制流化气速使团聚结构经历非破碎区域、过渡区域到完全破碎区域,团聚破坏方式从破碎阶段逐渐转变为磨损阶段;回收床料并测定团聚结构破碎程度,研究了液体含量、流化气速、液体浓度、初始团聚结构尺寸和颗粒润湿程度对于团聚结构破碎和磨损的影响;比较并分析了硅砂-糖水溶液系统以及焦炭-重质沥青液系统的团聚稳定性;确定了团聚结构破坏机制的主导因素,为团聚结构破碎和磨损行为的深入研究提供了重要理论基础。
Abstract
zhong guo tian ran qi zi yuan kui fa ,yuan you pu bian pian chong ,duo nian lai yi zhi xi wang jiang chong zhi you zhi jie zuo wei di tan xi ting sheng chan de lie jie yuan liao 。ban sui zhao dan you jia gong ji shu di sheng he dan you jia ge de shang zhang ,chao chong zhi you he chong zhi you zai jiang lai yuan you zi yuan zhong gong ying zeng chang shi bi ran qu shi ,lie zhi yuan you de jia gong ji gao xiao li yong cheng wei wo guo mian lin de zhu yao wen ti 。liu hua jiao hua fan ying gong yi yi chong zhi li qing ting wei yuan liao ye ,tong guo pen zui yi zheng qi de xing shi jin hang wu hua bing zhu ru zhuang you re tai jiao tan de liu hua chuang zhong ,ye xiang yi fei lian xu xiang de xing shi yin ru qi gu liu hua chuang 。dui yu ju you jiao gao nian du de chong zhi yuan liao ye ti er yan ,pen zui ji shu shi jin liao ji shu de he xin ,wu hua zhi liang de you lie zhi jie ying xiang dao yuan liao ye yu jiao tan ke li jie chu de chong fen cheng du 、fan ying xiao lv 、wen ding xing deng ,bing ju chi ye cao zuo jiang xian zhe ying xiang liu hua chuang zhong jiao tan ke li de liu ti li xue hang wei ji liu hua wen ding xing ,dan ye xiang de ju ti zuo yong shang bu ming que ,re yin qi ke li de tuan ju ,hui dao zhi chuang ceng beng ta ,sheng chan bei pai ting zhi 。yin ci ,wei le di gao lie hua fan ying su lv ,jiang di fan ying suo xu de neng hao ,zai bao zheng jin liao pen zui liang hao wu hua zhi liang de qian di xia ,yan jiu ye xiang shi ru he ying xiang qi gu liu hua chuang fan ying qi zhong de liu ti li xue hang wei ji tuan ju jie gou liu hua wen ding xing ju you chong da li lun yi yi he gong ye jia zhi 。ben wen wei rao chi ye liu hua chuang pen zui jie gou gai jin ji wu hua zhi liang you hua 、chi ye liu hua chuang liu ti dong li xue duo ceng ci biao zheng 、he tuan ju jie gou jian ce shi bie ji ji li san po sui kai zhan ru xia si ge fang mian de yan jiu gong zuo :shou xian ,shua qu gong ye zhong chang yong de liang chong lei xing pen zui zuo wei yan jiu dui xiang ,cai yong chong liang fen xi fa ce liang le chi ye liu hua chuang nei tuan ju jie gou de che cun fen bu te xing ,you xiao biao zheng le bu tong lei xing pen zui de she liu hun ge xiao guo ;tong guo gai jin pen zui shang you hun ge qi jie gou ,xiao chu le pen zui wu hua guo cheng de ye ti mai dong xian xiang ;jia zhuang qi zhao zhuang zhi jiang wu hua ye di tui xiang she liu wai wei ,jie ge gu ti ga dai zhuang zhi chuang zao de wen liu huan jing cu jin le zhou xiang ke li yu ye di de chong fen hun ge ;li yong chong ji zhui ti jie gou de yuan zhui ti zhang ai wu li san zhong xin ou yu de wu hua ye di ,jie ge qi zhao zhuang zhi chan sheng qi ti kong jian you xiao yi zhi le she liu ye di de zai ci ju ge yi ji ya su 。ran hou ,zai zhu bu di gao ye ti han liang de guo cheng zhong ,zhi zao bu tong tuan ju jie gou liu hua zhuang tai ,tong guo she xiang fa dui chi ye liu hua chuang nei qi pao de xing tai ji ji xiang gou liu zhuai bian de quan guo cheng jin hang le xi zhi de guan cha yu fen xi ;jie ge ya li xin hao ce liang ji shu ,cai yong ya li mai dong xin hao biao zhun cha fang fa ,you xiao de pan duan le chi ye liu hua chuang nei ke li de tuan ju 、gou liu deng bu liang liu hua zhuang tai ;cong suan fa yuan li chu fa ,zeng ge li yong gong lv pu fen xi 、xiao bo fen xi 、xiang gan fen xi he di gui fen xi deng xin xi chu li ji shu cong duo ceng ci jian li kuo ge biao zheng chi ye liu hua chuang qi pao hang wei de fang fa ,jie shi le liu hua chuang nei qi pao de zeng chang 、yun dong he shu liang sui ye ti han liang zeng jia de bian hua gui lv 。zai hou ,shua yong shui -sha ji tong mo ni re tai li qing -jiao tan ji tong ,tong guo lian xu de gong zhi wu hua shi yan ,ji yu dian dao xin hao fa ce liang wu hua pen zui zhu ru duo nian du ye ti de dian dao xin hao sui she liu shi jian de bian hua gui lv ,yan jiu duo nian du ye ti zhu ru guo cheng wu hua ye di yu ke li biao mian de jie chu xiao guo ;tong guo yu kong bai shi yan (mo nian shi yan )jie guo jin hang dui bi ,yan jiu ye ti nian du zai bu tong qi ye bi yu qi su tiao jian xia dui yu ke li tuan ju te xing de ying xiang ;zai xian jian ce bu tong liu hua jie duan ye ti she liu zai chuang ceng jin hang kuo san guo cheng de ke li tuan ju xian xiang ,wei duo nian du ye ti zhu ru guo cheng ke li tuan ju xian xiang de zai xian jian ce di gong le yi chong xin fang fa ,que bao le chi ye liu hua chuang nei wu hua ye di yu ke li biao mian de liang hao jie chu ;zui hou ,kong zhi liu hua qi su shi tuan ju jie gou jing li fei po sui ou yu 、guo du ou yu dao wan quan po sui ou yu ,tuan ju po huai fang shi cong po sui jie duan zhu jian zhuai bian wei mo sun jie duan ;hui shou chuang liao bing ce ding tuan ju jie gou po sui cheng du ,yan jiu le ye ti han liang 、liu hua qi su 、ye ti nong du 、chu shi tuan ju jie gou che cun he ke li run shi cheng du dui yu tuan ju jie gou po sui he mo sun de ying xiang ;bi jiao bing fen xi le gui sha -tang shui rong ye ji tong yi ji jiao tan -chong zhi li qing ye ji tong de tuan ju wen ding xing ;que ding le tuan ju jie gou po huai ji zhi de zhu dao yin su ,wei tuan ju jie gou po sui he mo sun hang wei de shen ru yan jiu di gong le chong yao li lun ji chu 。
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论文作者分别是来自东北电力大学的杨宁，发表于刊物东北电力大学2019-07-08论文，是一篇关于持液流化床论文,喷嘴雾化论文,颗粒团聚论文,动力学表征论文,稳定性机制论文,东北电力大学2019-07-08论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自东北电力大学2019-07-08论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：持液流化床论文; 喷嘴雾化论文; 颗粒团聚论文; 动力学表征论文; 稳定性机制论文; 东北电力大学2019-07-08论文;