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Frontiers in Energy 2024年第4期18卷 525-534页

作者： Juntian NIU Shengzhuo CHEN xianrong zheng Haiyu LIU Yan JIN Jingyu RAN College of Electrical and Power Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Low-grade Energy Utilization Technologies and Systems(Ministry of Education) Chongqing UniversityChongqing 400044China

In recent years,the dry reforming of methane(DRM)reaction has gained widespread attention due to its effective utilization of two major greenhouse *** Ni-based catalysts for DRM exhibit a strong dependence on particle size,however,the reaction mechanisms involved remain *** this work,the effect of metal particle size on CO_(2)activation and CO formation was explored in the DRM reaction using the density functional ***/MgO(x=13,25,37)was constructed to investigate the CO_(2)activation and the formation of CO during the DRM *** is found that CO_(2)is more inclined to undergo chemisorption on Nix/MgO before *** the variation in particle size,the main activation pathway of CO_(2)on the catalyst *** the smallest Ni13/MgO,CO_(2)tends to directly dissociate,while on the larger Ni25/MgO and Ni37/MgO,the hydrogenation dissociation of CO_(2)is more kinetically *** to Ni13/MgO and Ni37/MgO,the oxidation of surface C atoms and the oxidation of CH occur more readily on Ni25/*** indicates that C atoms are less likely to form on Ni25 particle and are more easily to be *** some extent,the results suggest that Ni25/MgO exhibits superior resistance to carbon formation.

关键词： particle size Ni/MgO catalyst CO_(2)activation CO formation

Desulfurization kinetics of ZnO sorbent loaded on semi-coke support for hot coal gas

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Journal of Natural Gas Chemistry 2012年第5期21卷 556-562页

作者： Zhiwei Ma xianrong zheng Liping Chang Ruiyuan He Weiren Bao Key Laboratory of Coal Science and Technology Taiyuan University of TechnologyMinistry of Education and Shanxi ProvinceTaiyuan 030024ShanxiChina

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 *** 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 *** 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 *** 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.

关键词： desulfurization kinetics Zn-based sorbent hot coal gas medium-temperature desulfurization

1-甲基环丙烯处理导致跃变型果实成熟障碍影响的研究进展

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食品与发酵工业 2024年第17期50卷 387-393页

作者：杨爽谢鸿林郑现容陈安均李萍赵迅刘兴艳四川农业大学食品学院四川雅安625014

1-甲基环丙烯(1-methylcyclopropene,1-MCP)是一种新型乙烯作用抑制剂,通过与乙烯竞争乙烯受体来阻断内源乙烯信号传导进而抑制乙烯的生物合成,为乙烯敏感型果实采后贮藏保鲜提供了新的保鲜思路和技术手段,并取得了显著的保鲜效果。然... 详细信息

1-甲基环丙烯(1-methylcyclopropene,1-MCP)是一种新型乙烯作用抑制剂,通过与乙烯竞争乙烯受体来阻断内源乙烯信号传导进而抑制乙烯的生物合成,为乙烯敏感型果实采后贮藏保鲜提供了新的保鲜思路和技术手段,并取得了显著的保鲜效果。然而近年来因1-MCP使用不当甚至滥用,造成果实无法正常成熟的现象频频发生,极大影响了果实的食用品质。该文从软化异常、香气形成受抑、色泽不均3个重要方面概述了1-MCP导致水果成熟障碍的具体表现,综述了1-MCP造成果实成熟障碍的影响因素,讨论了目前针对1-MCP造成果实成熟障碍的解决措施,以期为1-MCP在实际生产实践中的合理应用提供一定的参考。

关键词： 1-甲基环丙烯(1-MCP) 果蔬保鲜成熟障碍

Impact of impregnation pressure on desulfurization performance of Zn-based sorbents supported on semi-coke

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Journal of Natural Gas Chemistry 2012年第1期21卷 56-60页

作者： xianrong zheng Weiren Bao Qingmai Jin Ruiyuan He Liping Chang Kechang Xie Key Laboratory of Coal Science and Technology Ministry of Education and Shanxi ProvinceTaiyuan University of TechnologyTaiyuan 030024ShanxiChina College of Electrical and Power Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina

High-pressure impregnation, a new preparation method for sorbents to remove H2S from hot coal gas, is introduced in this paper. Semi-coke （SC） and ZnO is selected as the support and active component of sorbent, respectively. The sorbent preparation process includes high-pressure impregnation, filtration, ovendry and calcination. The aim of this research is to primarily study the effects of the impregnation pressure on physical properties and desulfurization ability of the sorbent. The desulfurization experiment was carried out in a fixed-bed reactor at 500 ~C and a simulated coal gas used in this work was composed of CO （33 vol%）, H2 （39 vol%）, H2S （300 ppm in volume）, and N2 （balance）. Experimental results show that the pore structure of the SC support can be improved effectively and ZnO active component can be uniformly dispersed on the support, with the small particle size of 10-500 nm. Sorbents prepared using high-pressure impregnation have better desulfurization capacity and their active components have higher utilization rate. P20-ZnSC sorbent, obtained by high-pressure impregnation at 20 atm, has the best desulfurization ability with a sulfur capacity of 7.54 g S/100g sorbent and a breakthrough time of 44 h. Its desulfurization precision and efficiency of removing H2S from the middle temperature gases can reach 〈 1 ppm and 〉99.7%, respectively, before sorbent breakthrough.

关键词： desulfurization high-pressure impregnation method semi-coke support ZnO sorbent

Effects of ultrasound on the desulfurization performance of hot coal gas over Zn-Mn-Cu supported on semi-coke sorbent prepared by high-pressure impregnation method

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Journal of Energy Chemistry 2015年第3期24卷 291-298页

作者： Xiaoyang Zhang xianrong zheng Peng Han Ze Liu Liping Chang State Key Laboratory Breeding Base of Coal Science and Technology Co-founded by Shanxi Province and the Ministry of Science and Technology Taiyuan University of Technology College of Electrical and Power Engineering Taiyuan University of Technology

Zn-Mn-Cu/SC（U） sorbent was hydrothermally synthesized by ultrasound-assisted high-pressure impregnation method with semi-coke（SC）as support and the mixed solution of zinc nitrate,manganese nitrate and copper nitrate as active component *** desulfurization performances of hot coal gas on the prepared sorbent at a mid-temperature of 500°C were tested in fixed-bed *** and pore structure of the prepared sorbent were also characterized by TEM,N2adsorption/desorption isotherms and *** comparison,the sorbent of Zn-Mn-Cu/SC prepared by conventional high-pressure impregnation was also evaluated and characterized in order to study the effects of ultrasound ***-Mn-Cu/SC（U） sorbent prepared by high-pressure impregnation under ultrasound-assisted condition showed a better desulfurization performance than Zn-Mn-Cu/*** could remove H2 S from 1000×10-6m3/m3 to 0.1×10-6m3/m3 at 500°C and maintained for 12.5 h with the sulfur capacity of 7.74%,in which both the breakthrough time and sulfur capacity were about 32% and 51% higher than those of Zn-Mn-Cu/SC *** introduction of ultrasound during high-pressure impregnation process greatly improved the morphology and pore structure of the *** ultrasonic treatment made particle size of active components smaller and made them more evenly disperse on semi-coke support,which provided more opportunities to contact with H2S in coal-based ***,there were no any difference in compositions and existing forms of active components on the Zn-Mn-Cu/SC and Zn-Mn-Cu/SC（U） sorbents.

关键词： ultrasound-assistance high-pressure impregnation mid-temperature desulfurization Zn-Mn-Cu sorbent semi-coke support

Mercury emission and adsorption characteristics of fly ash in PC and CFB boilers

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Frontiers in Energy 2021年第1期15卷 112-123页

作者： Li JIA Baoguo FAN xianrong zheng Xiaolei QIAO Yuxing YAO Rui ZHAO Jinrong GUO Yan JIN College of Electrical and Power Engineering Taiyuan University of TechnologyTaiyuan 030024China

The mercury emission was obtained by measuring the mercury contents in flue gas and solid samples in pulverized coal (PC) and circulating fluidized bed (CFB) utility boilers. The relationship was obtained between the mercury emission and adsorption characteristics of fly ash. The parameters included unburned carbon content, particle size, and pore structure of fly ash. The results showed that the majority of mercury released to the atmosphere with the flue gas in PC boiler, while the mercury was enriched in fly ash and captured by the precipitator in CFB boiler. The coal factor was proposed to characterize the impact of coal property on mercury emissions in this paper. As the coal factor increased, the mercury emission to the atmosphere decreased. It was also found that the mercury content of fly ash in the CFB boiler was ten times higher than that in the PC boiler. As the unburned carbon content increased, the mercury adsorbed increased. The capacity of adsorbing mercury by fly ash was directly related to the particle size. The particle size corresponding to the highest content of mercury, which was about 560 ng/g, appeared in the range from 77.5 to 106 µm. The content of mesoporous (4–6 nm) of the fly ash in the particle size of 77.5–106 µm was the highest, which was beneficial to adsorbing the mercury. The specific surface area played a more significant role than specific pore volume in the mercury adsorption process.

关键词： mercury combustion modes coal property fly ash particle size

高铁灰对钙基脱硫剂脱除SO_(2)行为的影响

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煤炭学报 2022年第S1期47卷 350-355页

作者：郑仙荣梁云波谭煜幺太原理工大学电气与动力工程学院山西太原030024

燃煤释放的大量SO_(2)气体给人类的生活和生产活动带来极大的危害。与此同时,燃煤排出的固体废弃物粉煤灰大量堆积也易造成粉尘污染。降低燃煤SO_(2)排放和消减粉煤灰已成为主要研究课题。粉煤灰的主要成分为SiO_(2),Al_(2)O_(3),Fe_(2)... 详细信息

燃煤释放的大量SO_(2)气体给人类的生活和生产活动带来极大的危害。与此同时,燃煤排出的固体废弃物粉煤灰大量堆积也易造成粉尘污染。降低燃煤SO_(2)排放和消减粉煤灰已成为主要研究课题。粉煤灰的主要成分为SiO_(2),Al_(2)O_(3),Fe_(2)O_(3)和CaO,其中Fe_(2)O_(3)和CaO对烟气中的SO_(2)具有一定脱除作用。CaO烟气脱硫效率高,但钙利用率较低,可以通过合适的改性方法提高其利用率。基于以废治废原则,通过湿式磁选将粉煤灰中的铁氧化物富集,获得高铁灰,将高铁灰与氧化钙水合制备钙基脱硫剂,并在固定床评价系统上进行SO_(2)脱除试验,结合XRD,BET和FTIR等揭示高铁灰对钙基脱硫剂脱除SO_(2)行为的影响。结果显示,高铁灰钙基脱硫剂具有较好的脱硫性能,穿透时间和硫容分别为26 min和14.87 mg/g。其原因是在钙基脱硫剂中添加高铁灰后,可增加钙基脱硫剂内水化物和铁氧化物等活性组分,脱硫反应活性中心由CaO颗粒转移至Fe_(2)O_(3)颗粒;Fe_(2)O_(3)具备储氧释氧功能,同时附着于CaO颗粒表面,使高铁灰脱硫剂表面具有优良的孔隙结构,易于SO_(2)气体穿过孔隙进入脱硫剂内部,延长脱硫反应时间,进而提升脱硫剂的脱硫能力;另一方面,Fe_(2)O_(3)的存在促进了被吸附在脱硫剂表面的SO_(2)转化为SO3,最终脱除的SO_(2)以SO^(2-)_(4)形式存在。动力学分析结果显示化学吸附脱除在吸附脱硫中起主导作用,化学吸附动力学遵循准二级动力学模型,高铁灰有助于增强钙基脱硫剂对SO_(2)的化学脱除能力。

关键词：高铁灰钙基脱硫剂水合改性脱硫化学吸附

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线性逐步遗忘协同过滤算法的研究

计算机工程 2007年第6期33卷 72-73,82页

作者：郑先荣曹先彬中国科技大学计算机科学与技术系合肥230027

协同过滤系统是目前最成功的一种推荐系统,但是传统的协同过滤算法没有考虑用户兴趣变化问题,导致用户兴趣发生变化时的推荐质量较差。该文借鉴心理学遗忘规律,提出了线性逐步遗忘协同过滤算法。该算法依据评价时间线性逐步减小每项评... 详细信息

协同过滤系统是目前最成功的一种推荐系统,但是传统的协同过滤算法没有考虑用户兴趣变化问题,导致用户兴趣发生变化时的推荐质量较差。该文借鉴心理学遗忘规律,提出了线性逐步遗忘协同过滤算法。该算法依据评价时间线性逐步减小每项评分的重要性。基于MovieLens数据集的实验结果表明,该算法在准确性方面优于传统的协同过滤算法。

关键词：协同过滤兴趣变化线性逐步遗忘

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载锰飞灰吸附剂脱除SO2的实验研究

中国电机工程学报 2019年第15期39卷 4504-4514页

作者：赵杰郑仙荣樊保国宋凯蒋海燕太原理工大学电气与动力工程学院

采用溶胶凝胶法制备脱除SO2用载锰飞灰吸附剂,并借助固定床评价系统对其脱硫性能进行测试。实验结果表明,吸附剂WNa(2)5Br Mn(3)100具有最高的脱硫能力,其本质原因是:NaBr在飞灰水化过程可以增强NaOH对飞灰表面玻璃体的破坏,生成水溶性... 详细信息

采用溶胶凝胶法制备脱除SO2用载锰飞灰吸附剂,并借助固定床评价系统对其脱硫性能进行测试。实验结果表明,吸附剂WNa(2)5Br Mn(3)100具有最高的脱硫能力,其本质原因是:NaBr在飞灰水化过程可以增强NaOH对飞灰表面玻璃体的破坏,生成水溶性胶体Na2SiO3,利用具有氧化性的Mn组分负载,Mn与Na2SiO3的共同作用可以显著增强吸附剂的脱硫性能,NaOH和Mn(NO3)2存在最佳添加量;溶胶温度会通过影响吸附剂的晶体结构来影响吸附剂的脱硫性能,溶胶温度越高其脱硫能力越强,最佳溶胶温度为100℃;飞灰吸附剂的粒径会通过影响其孔结构参数而影响对SO2的脱除能力,本实验中最佳粒径范围为270~150mm;根据载锰飞灰吸附剂自身特性,可用研磨溶胶的方法使其再生。

关键词：飞灰溶胶凝胶法激发剂溶胶温度脱硫吸附剂

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Mn-Cu吸附剂脱除模拟烟气中NO的研究

煤炭学报 2018年第B6期43卷 317-323页

作者：李军郑仙荣廖俊杰樊保国张冬冬太原理工大学电气与动力工程学院山西太原030024 煤科学与技术教育部和山西省共建重点实验室山西太原030024

采用超声辅助加压浸渍法在半焦上负载金属组分锰和铜,研究锰铜吸附剂在模拟烟气中脱除NO的性能。重点考察了金属组分和锰铜摩尔比对Mn-Cu吸附剂脱除NO性能的影响。通过XRD,BET,XPS,AAS等表征手段对Mn-Cu吸附剂NO脱除机理进行初步探索。... 详细信息

采用超声辅助加压浸渍法在半焦上负载金属组分锰和铜,研究锰铜吸附剂在模拟烟气中脱除NO的性能。重点考察了金属组分和锰铜摩尔比对Mn-Cu吸附剂脱除NO性能的影响。通过XRD,BET,XPS,AAS等表征手段对Mn-Cu吸附剂NO脱除机理进行初步探索。结果表明,双金属锰铜吸附剂脱除NO的能力远高于单金属锰吸附剂和铜吸附剂,在锰吸附剂中添加适量铜可以使锰铜组分之间产生协同效应从而显著提高吸附剂的脱硝性能;金属组分锰铜最佳浸渍摩尔比为3∶1,且实际负载量在1∶1时脱硝性能最佳,吸附剂M3C1在脱除效率为80%以上的穿透硝容高达10.07 mg/g,穿透时间长达300 min。在模拟烟气中含O_2气氛下,吸附剂中的Mn^(3+)是脱除NO的主体,碳骨架提供化学吸附的反应场所,组分Cu起到催化的作用。

关键词：锰铜吸附剂模拟烟气脱硝超声辅助加压浸渍