共查询到19条相似文献,搜索用时 156 毫秒
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高温煤气铁系脱硫剂的研究 总被引:6,自引:5,他引:6
高温煤气脱硫净化是目前先进洁净煤利用技术之一 ,但是以前高温煤气脱硫剂在多次硫化再生循环过程中出现粉化 ,妨碍脱硫剂进一步使用 .本研究选择钢厂赤泥作为脱硫剂原料 ,添加不同活性组分和防粉化结构助剂 ,制备了氧化铁基高温煤气脱硫剂 .经过 1 0次硫化 /再生循环实验 .结果表明 :1 0次循环累计 1 96.98% ,再生后脱硫活性不发生变化 ,具有较高和较稳定的脱硫活性 .再生后脱硫剂的机械强度高于新鲜样品 ,在使用过程中没有出现粉化现象 ,这为氧化铁基高温煤气脱硫剂的工业化研究提供了可靠的依据 . 相似文献
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热煤气一体化净化工艺中的脱硫反应特征 总被引:1,自引:0,他引:1
利用固定床反应器考察了高温煤气脱硫除尘一体化净化工艺中沉积粉尘对高温煤气脱硫剂脱硫性能的影响.结果表明,表面沉积粉尘对脱硫剂初次硫化行为有明显的影响,且与脱硫剂的组成和结构有关.利用钢厂赤泥制备的脱硫剂,含有多种惰性杂质,且具有较大的孔径结构,易于和粗煤气中的粉尘作用,造成脱硫剂硫容的减小.硫化气氛中,H2O的存在造成脱硫剂硫容和脱硫效率的降低,但不会影响因表面沉积粉尘造成的脱硫剂硫容的减小.多次硫化-再生循环实验表明,硫化-再生循环过程有助于减小表面沉积粉尘对脱硫剂脱硫行为的影响.经历一定次数的硫化-再生循环后,粉尘对脱硫剂脱硫行为的影响逐渐消失. 相似文献
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The coal poly-generation system for the production of alcohol and ether fuels as well as power is one of advanced coal utilization techniques. The team leaded by Professor Xie Kechang is carrying out the research on the poly-generation system to produce the syngas from the combination of gasified and pyrolyzed coal gas (dual gas resources) for the alcohol ether synthesis. Gas desulfurization is one of the key technologies for this system. The desulfurization matching with dual gas resources based poly-generation system for the production of alcohol and ether fuels as well as power is presented according to gas components, sulfur content, sulfur species and desulfurization accuracy in this technology. This matching desulfurization is classified into hot gas desulfurization, normal gas desulfurization, warm gas desulfurization and organic sulfur catalytic conversion. The preparation of H2S removal sorbents, organic sulfur hydrolysis catalyst and the evaluation of their activities involved in the system were investigated. The H2S removal efficiencies of the crude and fine desulfurization sorbents prepared for hot gas desulfurization are 90% and 99% at 500 °C in simulating coal gas, and their sulfur capacities are 21.85 wt.% and 24.91 wt.%, respectively. The organic sulfur catalyst shows the high hydrolysis activity, and the hydrolysis conversion of COS is more than that of CS2 on the same catalyst. The research will provide necessary information for the matching desulfurization technology in the demonstration project on dual gas resources coal poly-generation system. 相似文献
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采用钢厂的废物赤泥为活性成分,添加不同的黏结剂及造孔剂制备出了高温煤气脱硫剂。对制备的脱硫剂的脱硫活性和机械强度进行了测试与表征。结果表明,以赤泥为原料制备的脱硫剂是一种性能优良的脱硫剂。黏结剂的添加不仅能够提高脱硫剂的抗粉化性能,而且也可通过改变脱硫剂的织构来影响脱硫效果,分别添加三种黏结剂后,脱硫剂的机械强度最高的由188 N/cm提高到230 N/cm。同时通过对脱硫剂的硫容和穿透曲线进行的综合考察,发现高机械强度的脱硫剂,并不一定有高的硫容和脱硫效率,而适宜的强度能够提高脱硫剂的脱硫效率。 相似文献
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通过微波与常规固相法制备了铁酸锌高温煤气脱硫剂,使用X射线衍射(XRD)、氮吸附、扫描电子显微镜(SEM)以及X射线光电子能谱(XPS)对两种不同焙烧方式制备的脱硫剂的物相组成、织构形貌和表面元素进行了表征。数据显示微波焙烧制备的脱硫剂具有孔隙结构丰富、表面金属元素含量高、结合能低等优点。使用热天平对铁酸锌脱硫剂硫化行为进行了研究,根据等效粒子模型计算了两种脱硫剂与硫化氢气体反应的动力学参数,得到了硫化反应动力学方程,并在固定床上对其煤气脱硫性能进行了考察。结果表明硫化过程分为化学反应控制区和颗粒内扩散控制区。微波焙烧制备脱硫剂的化学反应活化能和颗粒内扩散活化能较低,说明其在硫化氢气体脱除上具有更高的活性。在模拟煤气气氛下,相比常规焙烧方法制备的脱硫剂,微波制备的脱硫剂的脱硫性能显著提高,具有更高的硫容和更长的精脱硫时间。 相似文献
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Jinxiao Dou Yongqi Zhao Arash Tahmasebi Jianglong Yu 《Korean Journal of Chemical Engineering》2016,33(10):2849-2857
The sulfidation and regeneration properties of lignite char-supported iron-based sorbent for coke oven gas (COG) desulfurization prepared by mechanical stirring (MS), ultrasonic assisted impregnation (UAI), and high pressure impregnation (HPI) were investigated in a fixed-bed reactor. During desulfurization, the effects of process parameters on sulfidation properties were studied systematically. The physical and chemical properties of the sorbents were analyzed by X-ray diffraction (XRD), scanning electron microscope coupled with energy dispersive spectroscopy (SEM-EDS), Fourier transform infrared (FTIR) and BET surface area analysis. The results of desulfurization experiments showed that high pressure impregnation (HPI) enhanced the sulfidation properties of the sorbents at the breakthrough time for char-supported iron sorbents. HPI method also increased the surface area and pore volume of sorbents. Sulfur capacity of sorbents was enhanced with increasing sulfidation temperatures and reached its maximum value at 400 °C. It was observed that the presence of steam in coke oven gas can inhibit the desulfurization performance of sorbent. SO2 regeneration of sorbent resulted in formation of elemental sulfur. HPIF10 sorbent showed good stability during sulfide-regeneration cycles without changing its performance significantly. 相似文献
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引 言燃烧脱硫技术是在高温燃烧过程中将煤中的硫转化为硫酸盐或硫化物 ,因而其固硫率与硫酸盐或硫化物的热力学形成过程密切相关 .据文献报道 ,CaSO3和CaSO4 分别在 10 0 4℃[1] 和 1195~ 12 14℃[2 ] 就已开始分解 .纯CaSO4 在 12 5 0℃高温下的分解率为 85 % .纯BaSO4 的分解温度为 15 80℃[3] ,大大高于CaSO4 ,显示较高的热稳定性 .根据元素周期表递变规律 ,位于第 6周期的Ba较位Fig .1 Schematicofintelligentsulfurdetermination1—mainframeofin… 相似文献