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Desulfurization kinetics of ZnO sorbent loaded on semi-coke support for hot coal gas 被引量:7
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作者 Zhiwei Ma Xianrong Zheng +2 位作者 Liping Chang Ruiyuan He Weiren Bao 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2012年第5期556-562,共7页
Zn-based sorbent (Z20SC) prepared through semi-coke support in 20 wt% zinc nitrate solution by high-pressure impregnation presents an excellent desulfurization capacity in hot coal gas,in which H2 S can not be nearl... Zn-based sorbent (Z20SC) prepared through semi-coke support in 20 wt% zinc nitrate solution by high-pressure impregnation presents an excellent desulfurization capacity in hot coal gas,in which H2 S can not be nearly detected in the outlet gas before 20 h breakthrough time.The effects of the main operational conditions and the particle size of Z20SC sorbent on its desulfurization performances sorbent were investigated in a fixed-bed reactor and the desulfurization kinetics of Z20SC sorbent removing H2 S from hot coal gas was calculated based on experimental data.Results showed that the conversion of Z20SC sorbent desulfurization reaction increased with the decrease of the particle size of the sorbent and the increases of gas volumetric flow rate,reaction temperature and H 2 S content in inlet gas.Z20SC sorbent obtained from hydrothermal synthesis by high-pressure impregnation possessed much larger surface area and pore volume than semi-coke support,and they were significantly reduced after the desulfurization reaction.The equivalent grain model was reasonably used to analyze experimental data,in which k s=4.382×10-3 exp(-8.270×103/RgT) and Dep=1.262×10-4exp(1.522×104/RgT).It suggests that the desulfurization reaction of the Z20SC sorbent is mainly controlled by the chemical reaction in the initial stage and later by the diffusion through the reacted sorbent layer. 展开更多
关键词 desulfurization kinetics Zn-based sorbent hot coal gas medium-temperature desulfurization
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Effect of binder on the properties of iron oxide sorbent for hot gas desulfurization 被引量:1
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作者 Fang Zhu Chunhu Li Huilin Fan 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2010年第2期169-172,共4页
The most difficult problem in hot gas desulfurization in Integrated Coal Gasification Combined Cycle (IGCC) is the pulverization of sulfur removal sorbents.Appropriate binders for hot gas sulfur removal sorbents can... The most difficult problem in hot gas desulfurization in Integrated Coal Gasification Combined Cycle (IGCC) is the pulverization of sulfur removal sorbents.Appropriate binders for hot gas sulfur removal sorbents can solve the pulverization problem.In this paper,six sorbents with binders of different argillaceous minerals were prepared by mechanical mixing method.Desulfurization behavior for hot gas desulfurization sorbents was investigated in a fixed-bed reactor.Result showed that sorbent NTKW2 with binder of clay had a better sulfidation performance.NTKW2 had a more stable performance than other sorbents in the continuous sulfidation-regeneration cycles.Sulfur capacity of sorbent remained the same in each cycle.The desulfurization efficiency and mechanical strength of NTKW2 were the best among the tested sorbents.The behavior of NTKW2 at different temperatures showed different performances,and the best reaction temperature was 550 ℃.Higher heat stability,sulfur capacity and desulfurization efficiency were found on NTKW2 in six continuous sulfidation-regeneration cycles. 展开更多
关键词 hot gas desulfurization integrated coal gasification combined cycle (IGCC) BINDER iron oxide sorbent SULFIDATION
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DEVELOPMENT OF SMOVEN PROCESS FOR HOT GAS DESULFURIZATION
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作者 彭万旺 步学朋 +2 位作者 王乃计 戢绪国 谢可玉 《Journal of Coal Science & Engineering(China)》 1997年第1期79-85,共7页
The Beijing Research lnstitute of Coal Chemistry (BRICC) is developing the SMOVEN process for hot gas desulfurization. The SMOVEN process features sulfidation in an entrained bed,regeneration in a low velocity fluid b... The Beijing Research lnstitute of Coal Chemistry (BRICC) is developing the SMOVEN process for hot gas desulfurization. The SMOVEN process features sulfidation in an entrained bed,regeneration in a low velocity fluid bed or a moving bed with oxygen and sorbent circuIation con-trolled by gas stream. A series of tests on the bench scale unit and the continuous process devel-opment unit were carried out. The regenerable metal oxide sorbents were adopted for the sulfur-related components removing from coal gas at the temperature of 550-650℃. A fluidized bed gasifier of 100 mm (id) generated coal gas for tests. The principle of SMOVEN process has been positively verified. 展开更多
关键词 hot gas desulfurization SMOVEN process entrained bed fluid bed moving bed
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Research on improvement in Zn-based sorbent for hot gas desulfurization
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作者 张翠清 步学朋 +1 位作者 应幼菊 彭万旺 《Journal of Coal Science & Engineering(China)》 2005年第1期63-66,共4页
Two Zn-based sorbents, L-991 and L-992 used for hot gas desulfurization (HGD) were introduced. Zn/Ti ratio of the two sorbent was 1:1 and 2:3 resptively and a certain proportion of Cu and Mn metal oxide were added int... Two Zn-based sorbents, L-991 and L-992 used for hot gas desulfurization (HGD) were introduced. Zn/Ti ratio of the two sorbent was 1:1 and 2:3 resptively and a certain proportion of Cu and Mn metal oxide were added into L-992, which provided better performance than L-991 in aspects of suitable work temperature, sulfur capacity and agglomeration on the surface of sorbent particles. The evaluation tests were done on both sorbents include multi cycles tests. ARD and SEM analysis were done on fresh and post tests sorbent. During continuous sulfidation/regeneration, the H2S concentra- tion can be reduced from about 10 g/m3 to less than 20 mg/m3, the H2S removal effi- ciency >99 %. 展开更多
关键词 combined cycle hot gas desulfurization (HGD) Zn-based sorbent inte- grated coal gasification
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Cold Model Study on Mg Desulfurization of Hot Metal Under Mechanical Stirring 被引量:5
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作者 LIU Yan ZHANG Zi-mu +3 位作者 LIU Jian-nan ZHANG Jun-hua Masamichi Sano ZHANG Jun 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2013年第12期1-6,共6页
The new method of in-situ desulfurization with mechanical stirring of new type impellers was introduced, in which the bubble's dispersion and disintegration of magnesium vapor were the key to boosting the desulfuriza... The new method of in-situ desulfurization with mechanical stirring of new type impellers was introduced, in which the bubble's dispersion and disintegration of magnesium vapor were the key to boosting the desulfurization efficiency and increasing the utilization rate of magnesium. Effects of different new type of impellers on bubble dis persion and disintegration were studied through bubble image analysis, gas-liquid mass transfer, and power con- sumption levels of different impeller structures. The results showed that the sloped swept-back blade impeller-2 pro- duces optimal bubble's dispersion and disintegration, as well as higher volumetric mass transfer coefficient and CO2 gas utilization while consuming the least power. Numerical simulation result with Fluent software also showed that the sloped swept-back blade impeller-2 has higher turbulent kinetic energy and better velocity distribution than the other two impellers. 展开更多
关键词 gas injection refining eccentric mechanical stirring bubble disintegration bubble dispersion volumetric mass transfer coefficient Mg desulfurization hot metal
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Kinetics of hot metal desulfurization by bottom blowing magnesium vapor
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作者 Jian-ming Su Zhi-he Dou +1 位作者 Ting-an Zhang Yan Liu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2020年第4期392-401,共10页
To solve the technical problems of hot metal desulfurization by injecting magnesium particulate,a new idea of hot metal desulfurization by bottom-blowing magnesium vapor was put forward.The reaction mechanism of hot m... To solve the technical problems of hot metal desulfurization by injecting magnesium particulate,a new idea of hot metal desulfurization by bottom-blowing magnesium vapor was put forward.The reaction mechanism of hot metal desulfurization with magnesium vapor injection was analyzed,and the kinetic model of the desulfurization rate during the process of hot metal desulfurization with magnesium vapor injection was established.The dimensionless equation of the gas–liquid mass transfer coefficient under the injection conditions was obtained by the dimensional analysis method.And the theoretical calculation results were in good agreement with the experimental measurements.The results show that the diameter of the bubbles and the viscosity of the melt significantly affect the desulfurization rate of hot metal injected with magnesium vapor.When the temperature is 1573 K and the gas flow rate is 3 L/min,the desulfurization rate can reach 79%and the utilization rate of magnesium can reach 83%. 展开更多
关键词 Magnesium vapor hot metal desulfurization gas–liquid reaction Kinetic model desulfurization rate
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气体污染物之中高温净化技术
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作者 邱耀平 陈一顺 黄亮维 《武汉大学学报(工学版)》 CAS CSCD 北大核心 2012年第6期809-816,共8页
核能研究所从2005年起,开始执行净碳技术领域研究,而气体污染物之中高温净化技术为其中的重点之一.中高温净化程序系将典型低温气体处理程序由室温提升至中高温层级,藉由气体处理温度的增高,可降低因温度变化所导致的可用能量减损,进而... 核能研究所从2005年起,开始执行净碳技术领域研究,而气体污染物之中高温净化技术为其中的重点之一.中高温净化程序系将典型低温气体处理程序由室温提升至中高温层级,藉由气体处理温度的增高,可降低因温度变化所导致的可用能量减损,进而提升系统整体效能.主要涵盖两大领域技术,首先为流动式颗粒床过滤器气体净化技术,其原生技术为一可应用于中高温的粉尘过滤装置,本研究将其延伸发展为一种复合型过滤系统.其次,中高温脱硫为具有前瞻性的气体减排技术之一,本研究以含浸法制备脱硫剂,并于固定床反应器中进行化性测试;目前得到的最佳吸附容量为7.4g-S/100g sorbent.藉由上述技术之发展,希望提供温室气体排放减量的可行技术. 展开更多
关键词 净碳技术 中高温气体污染物净化程序 流动式颗粒床过滤器 合成气 中高温脱硫
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