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High-efficiency CO_(2) sequestration through direct aqueous carbonation of carbide slag: determination of carbonation reaction and optimization of operation parameters

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Frontiers of Environmental Science & Engineering 2024年第1期18卷 157-167页

作者： Zhiqiang Wang Longpeng Cui Yanfang Liu jili hou Hongwei Li Liang Zou Fuxia Zhu Department of Coal and Syngas Conversion Sinopec Research Institute of Petroleum Processing Co.Ltd.Beijing 100083China

Under the dual-carbon target, CO_(2) mineralization through solid wastes presents a mutually beneficial approach for permanent carbon emission reduction at a low material cost, while also enabling the resource utilization of these wastes. However, despite its potential, a comprehensive understanding about the effect of industrial solid waste properties and operating parameters on the carbonation process, and the mechanism of direct aqueous carbonation is still lacking. A series of experiments were conducted to compare the carbonation performance of fly ash, steel slag, and carbide slag. Subsequently, CO_(2) mineralization by carbide slag was systematically studied under various operating parameters due to its high CO_(2) sequestration capacity. Results showed the reactivity of CaO and Ca(OH)2 was higher than that of CaO·SiO_(2) and 2CaO·SiO_(2). Carbide slag demonstrated a sequestration capacity of 610.8 g CO_(2)/kg and carbonation efficiency ζCa of 62.04% under the conditions of 65 ℃, 1.5 MPa initial CO_(2) pressure, 15 mL/g liquid-to-solid ratio, and 200 r/min stirring speed. Moreover, the formation of carbonates was confirmed through XRD, SEM-EDS, TG, and FTIR. A mechanism analysis revealed that initially, the rate of the carbonation process was primarily controlled by the mass transfer of CO_(2) in the gas–liquid interface. However, the rate-determining step gradually shifted to the mass transfer of Ca2+ in the solid–liquid interface as the reaction time increased. This study lays the foundation for the large-scale implementation of CO_(2) sequestration through carbide slag carbonation.

关键词： Industrial by-products Direct aqueous carbonation CO_(2)sequestration Mass transfer

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CO2 mineralization by typical industrial solid wastes for preparing ultrafine CaCO3: A review

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Green Energy and Environment 2024年第11期9卷 1679-1697页

作者： Xu, Run Zhu, Fuxia Zou, Liang Wang, Shuqing Liu, Yanfang hou, jili Li, Chenghao Song, Kuntong Kong, Lingzhao Cui, Longpeng Wang, Zhiqiang Department of Coal and Syngas Conversion Sinopec Research Institute of Petroleum Processing CO. Ltd. Beijing 100083 China School of Environmental Science and Engineering Suzhou University of Science and Technology Suzhou 215000 China

Mineral carbonation is a promising CO2 sequestration strategy that can utilize industrial wastes to convert CO2 into high-value CaCO3. This review summarizes the advancements in CO2 mineralization using typical industrial wastes to prepare ultrafine CaCO3. This work surveys the mechanisms of CO2 mineralization using these wastes and its capacities to synthesize CaCO3, evaluates the effects of carbonation pathways and operating parameters on the preparation of CaCO3, analyzes the current industrial application status and economics of this technology. Due to the large amount of impurities in solid wastes, the purity of CaCO3 prepared by indirect methods is greater than that prepared by direct methods. Crystalline CaCO3 includes three polymorphs. The polymorph of CaCO3 synthesized by carbonation process is determined the combined effects of various factors. These parameters essentially impact the nucleation and growth of CaCO3 by altering the CO2 supersaturation in the reaction system and the surface energy of CaCO3 grains. Increasing the initial pH of the solution and the CO2 flow rate favors the formation of vaterite, but calcite is formed under excessively high pH. Vaterite formation is favored at lower temperatures and residence time. With increased temperature and prolonged residence time, it passes through aragonite metastable phase and eventually transforms into calcite. Moreover, polymorph modifiers can decrease the surface energy of CaCO3 grains, facilitating the synthesis of vaterite. However, the large-scale application of this technology still faces many problems, including high costs, high energy consumption, low calcium leaching rate, low carbonation efficiency, and low product yield. Therefore, it is necessary to investigate ways to accelerate carbonation, optimize operating parameters, develop cost-effective agents, and understand the kinetics of CaCO3 nucleation and crystallization to obtain products with specific crystal forms. Furthermore, more studi

关键词： Carbonation

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A comparative study on characteristics of sulfur and nitrogen transformation and gaseous emission for combustion of bituminous coal and char

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Carbon Resources Conversion 2018年第1期1卷 86-93页

作者： jili hou Yue Ma Shuyuan Li Wenzhi Shang a State Key Laboratory of Heavy Oil Processing China University of Petroleum-BeijingBeijing 102249PR China Shenmu Sanjiang Coal Chemical Industry Co. Ltd.Shenmu 719300PR China

The characteristics of sulfur and nitrogen transformation and the emissions’comparison of sulfurous and nitrogenous gas were investigated using SEM,XPS,TG-FTIR and TG-gas analyzer during the combustion process of Shenmu bituminous coal(SM coal)and its *** indicated that porosity and specific surface area of char were enlarged after coal pyrolysis and a large amount of space could be provided for the oxidation reaction of various sulfur species with oxide during the combustion *** sulfur and nitrogen species of the two samples analyzed by XPS showed that,pyritic sulfur,organic sulfide sulfur,sulfone and sulfoxide sulfur in coal were partly transformed to thiophenic sulfur and sulfate sulfur in the pyrolysis of coal,and the total sulfur content in char was ***,the sulfur and nitrogen species’changes in SM coal,char and the ashes determined by XPS showed that sulfur fixation effect was enhanced in the presence of calcium oxide during *** component analysis of the gas during combustion via TG-FTIR indicated that SO2 and NO2 began to escape at 300C and reached maximum at about 1100C,by contrast,the emissions of SO2 and NO2 of char were below that of SM coal throughout the whole combustion *** wide range of TG-gas analyzer analysis revealed that the SO2 and NOx emissions of SM coal were 2.51 and 1.71 times as much as char burning,respectively.

关键词： Coal Char S/N Combustion Transformation XPS TG-FTIR

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生活垃圾焚烧飞灰直接湿法矿化固碳性能

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石油炼制与化工 2024年第4期55卷 95-104页

作者：赵明明郎子轩刘艳芳侯吉礼王志强崔龙鹏中石化石油化工科学研究院有限公司北京100083

为实现生活垃圾焚烧飞灰(MSWIFA)资源化利用,采用单因素法和响应面曲线法研究MSWIFA直接湿法矿化固碳性能,获得最大CO_(2)封存率,并采用BCR形态分析及毒性浸出试验评价其矿化前后重金属环境风险。结果表明:随着反应温度、压力、时间及... 详细信息

为实现生活垃圾焚烧飞灰(MSWIFA)资源化利用,采用单因素法和响应面曲线法研究MSWIFA直接湿法矿化固碳性能,获得最大CO_(2)封存率,并采用BCR形态分析及毒性浸出试验评价其矿化前后重金属环境风险。结果表明:随着反应温度、压力、时间及液固比的增大,MSWIFA的CO_(2)封存率先增大后减小,在105℃、2.0 MPa、1.5 h和液固比为20 mL g时最大CO_(2)封存率分别为16.71%,15.80%,15.36%,14.96%;基于响应面曲线法得出的优化反应条件为0.5 MPa、99.19℃、1 h及液固比25 mL g,最大CO_(2)封存率为12.91%;矿化反应后,MSWIFA中As和Pb的可氧化态转化为残渣态,Ba转化为可还原态,Cd转化为残渣态和可还原态,Zn的残渣态和可氧化态转化为可还原态和酸可溶态,反应后均无重金属毒性浸出的环境风险。

关键词：生活垃圾焚烧飞灰矿化反应 CO_(2)封存响应面曲线法浸出毒性

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An optimization-oriented modeling approach using input convex neural networks and its application on optimal chiller loading

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Building Simulation 2024年第4期17卷 639-655页

作者： Shanshuo Xing jili Zhang Song Mu Dalian University of Technology Dalian116024China Guangdong Airport Baiyun Information Technology Co. Ltd.Guangzhou510000China

Optimization for the multi-chiller system is an indispensable approach for the operation of highly efficient chiller *** optima obtained by model-based optimization algorithms are dependent on precise and solvable objective *** classical neural networks cannot provide convex input-output mappings despite capturing impressive nonlinear fitting capabilities,resulting in a reduction in the robustness of model-based *** this paper,we leverage the input convex neural networks(ICNN)to identify the chiller model to construct a convex mapping between control variables and the objective function,which enables the NN-based OCL as a convex optimization problem and apply it to multi-chiller optimization for optimal chiller loading(OCL).Approximation performances are evaluated through a four-model comparison based on an experimental data set,and the statistical results show that,on the premise of retaining prior convexities,the proposed model depicts excellent approximation power for the data set,especially the unseen ***,the ICNN model is applied to a typical OCL problem for a multi-chiller system and combined with three types of optimization *** with conventional and meta-heuristic methods,the numerical results suggest that the gradient-based BFGS algorithm provides better energy-saving ratios facing consecutive cooling load inputs and an impressive convergence speed.

关键词： chiller plant input convex neural network optimal load distribution convex optimization

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煤气化飞灰合成有序介孔纳米氧化硅及其吸附罗丹明B的性能

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煤炭学报 2022年第11期47卷 3990-3997页

作者：刘艳芳崔龙鹏侯吉礼中石化石油化工科学研究院有限公司北京100083

煤气化飞灰是煤气化产生的固体废物,其产量逐年增多。受建材市场需求减弱的影响,煤气化飞灰制备建工建材的传统利用方式受限,亟待寻求高附加值利用技术。以煤气化飞灰为硅源制备硅基材料可实现其高附加值利用,但硅提取效率低及所制备材... 详细信息

煤气化飞灰是煤气化产生的固体废物,其产量逐年增多。受建材市场需求减弱的影响,煤气化飞灰制备建工建材的传统利用方式受限,亟待寻求高附加值利用技术。以煤气化飞灰为硅源制备硅基材料可实现其高附加值利用,但硅提取效率低及所制备材料性能较差限制了该技术的应用。基于此,以Shell粉煤气化飞灰为硅源,采用微波加热碱溶(微波法)提取硅-水热合成两步法制备了有序介孔纳米氧化硅(mSiO_(2)),并对比了微波法和常规水热法在提取Shell粉煤气化飞灰中硅元素,以及以2种方法所得提取液为硅源制备的氧化硅性能上的差异。采用小角XRD、N 2吸附/脱附、TEM、FTIR和Zeta电位等方法对所制备纳米氧化硅的结构、形貌、官能团和表面电位进行表征,并研究了其对废水中染料罗丹明B(RhB)的吸附性能。结果表明:微波法能快速、高效、选择性地提取煤气化飞灰中的硅元素,碱灰比(NaOH与煤气化飞灰的质量比)为0.5、反应时间为30 min时硅的提取率达20.2%,且除低浓度的铝元素外,无其他杂质元素溶出,利于高纯度纳米氧化硅的合成。碱灰比在0.5~1.5时,相同条件下,微波法提取的Si元素浓度为水热法的2.4~3.3倍。采用微波加热碱溶提取硅-水热合成两步法制备的氧化硅为高度有序的介孔材料,比表面积高达1069 m^(2)/g,孔体积高达1.02 cm^(3)/g,孔径在2~6 nm,Zeta电位为-63.2 mV。mSiO_(2)对废水中RhB具有良好的吸附能力,室温下可在10 min内将溶液中的RhB吸附去除90%以上,最大去除率达96%,是以水热法所得提取液制备的介孔氧化硅的1.9倍。mSiO_(2)良好的吸附性能归因于其多孔结构和丰富的表面负电荷。吸附RhB后的纳米氧化硅可通过煅烧再生。良好的吸附能力和易再生优势,使其在吸附领域具有广阔应用前景。

关键词：介孔纳米氧化硅罗丹明B(RhB) 飞灰煤气化吸附微波

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油页岩干酪根热解产物特性研究

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石油炼制与化工 2021年第8期52卷 49-55页

作者：侯吉礼石剑崔龙鹏中国石化石油化工科学研究院北京100083 常州大学石油化工学院

采用裂解色谱(PY-GC-MS)、电子顺磁共振波谱(EPR)和红外光谱(FTIR)等技术手段,分析了Estonia油页岩中干酪根及其热解产物的结构特性,研究了不同温度下中间产物与最终产物的关联性。结果显示:油页岩热解符合干酪根热解为中间产物热沥青,... 详细信息

采用裂解色谱(PY-GC-MS)、电子顺磁共振波谱(EPR)和红外光谱(FTIR)等技术手段,分析了Estonia油页岩中干酪根及其热解产物的结构特性,研究了不同温度下中间产物与最终产物的关联性。结果显示:油页岩热解符合干酪根热解为中间产物热沥青,热沥青再热解为页岩油、干馏气和半焦等产物反应路径,中间产物热沥青的生成趋势反映了终产物的生成速率变化;H_(2)、CH_(4)和C_(2)~C_(5)组分主要来自热沥青中脂肪烃的芳构化、芳香族化合物烷基侧链的断裂及含氧化合物的缩聚等,干酪根热解产生的烷烃和烯烃类化合物是产油气的主要组分。干酪根和页岩油的自由基自旋浓度明显低于热沥青和半焦;半焦g值最大,干酪根次之,热沥青和页岩油的g值偏低。

关键词：油页岩热解中间产物热沥青干酪根

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Magnetic properties of soft magnetic composites prepared by gas-atomized glassy powders from a new Fe-based alloy with high glass-forming ability

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Science China(Physics,Mechanics & Astronomy) 2024年第11期67卷 91-104页

作者： Ranbin Wang jili Jia You Wu Wenhui Guo Na Chen Yang Shao Kefu Yao School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Wuzhen Laboratory Tongxiang 314500China

With a pressing need for high efficiency, low power consumption, and miniaturization of electronics, soft magnetic composites(SMCs) show great potential, especially for applications in key electronic component. However, core loss is still the focused issue for SMCs that hinders their sustainable development and widespread applications. In the present study, high-performance SMCs were fabricated by novel Fe_(74)B_(7)C_(7)P_(7)Si_(3)Mo_(1)Cr_(1) powders with spherical shape and a fully glassy structure, which were successfully prepared by a gas atomization method. The microstructure and high-frequency magnetic properties of these SMCs were studied in detail. To enhance the soft ferromagnetism, the effects of annealing temperature(T_a) and powder size on their performance were clarified. Increasing T_a up to 703 K not only helps to effectively release internal stress in the powders, but also improves the integrity of the insulation layer structure, which is conducive to decreasing the core loss. In addition, reducing the powder size contributes to the overall performance enhancement. Prepared from the powders with the smallest mean particle size and annealed at 703 K, the SMC exhibits optimum property combination of a stable effective permeability of 26.2 up to 1 MHz, a total core loss of 883 kW m^(–3)(100 kHz, 100 mT), and a DC-Bias performance of 79.3% under 100 Oe field, which is even comparable to those of the most prominent SMCs reported so far. These results are meaningful for potentially stimulating the development and application of new low-loss SMCs.

关键词： metallic glassy powder soft magnetic composite annealing temperature particle size high-frequency property

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A Scenario-classification Hybrid-based Banding Method for Power Transfer Limits of Critical Inter-corridors

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Journal of Modern Power Systems and Clean Energy 2024年第2期12卷 547-560页

作者： Lidong Yi Maosheng Ding jili Wang Gao Qiu Fei Xue Ji'ang Liu Yuxiong Huang Gengfeng Li Junyong Liu State Grid Ningxia Electric Power Co. Ltd.YinchuanChinaand M.Ding is also with State Grid Ningxia Electric Power Research InstituteYinchuanChina Northwest Branch State Grid Corporation of ChinaXi’anChina School of Electrical Engineering Sichuan UniversityChengduChina State Grid Ningxia Electric Power Research Institute Yinchuan YinchuanChina School of Electrical Engineering Xi’an Jiaotong UniversityXi’anChina IEEE

To secure power system operations,practical dispatches in industries place a steady power transfer limit on critical inter-corridors,rather than high-dimensional and strong nonlinear stability ***,computational complexities lead to over-conservative pre-settings of transfer limit,which further induce undesirable and non-technical congestion of power *** conquer this barrier,a scenario-classification hybrid-based banding method is proposed.A cluster technique is adopted to separate similarities from historical and generated operating condition *** a practical rule,transfer limits are approximated for each operating ***,toward an interpretable online transfer limit decision,costsensitive learning is applied to identify cluster affiliation to assign a transfer limit for a given *** this stage,critical variables that affect the transfer limit are also picked out via mean impact *** enables us to construct low-complexity and dispatcher-friendly rules for fast determination of transfer *** numerical case studies on the IEEE 39-bus system and a real-world regional power system in China illustrate the effectiveness and conservativeness of the proposed method.

关键词： Transfer limit transfer capability power transfer inter-corridor cluster cost-sensitive learning banding power system operation

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Microstructure optimization and electrochemical behavior of in-situ growth Ramsdellite-MnO_(2)@NCA-LDH@CC for supercapacitors and oxygen evolution reaction catalysts

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Journal of Materiomics 2024年第3期10卷 552-565页

作者： Xinpeng Huang Yanli Li Xuehua Yan Feng Zhang Chu Chu jili Wu Jianmei Pan Zohreh Shahnavaz Jamile Mohammadi Moradian School of Materials Science and Engineering Jiangsu UniversityZhenjiang212013JiangsuChina Institute for Advanced Materials Jiangsu UniversityZhenjiang212013JiangsuChina

Supercapacitors are electrochemical energy storage devices with great potential ***-while,the oxygen evolution reaction(OER)determines the efficiency of some electrochemical energy *** study aims at constructing,exploring,and optimizing Ramsdellite-MnO_(2)@NiCoAl-LDH@CC(R-MNCA@CC)*** effect of microstructure and Al role on the performance is investigated when R-MNCA@CC was used as supercapacitor electrode material and OER ***-like R-MNCA@CC in-situ growth composites were synthesized by a two-step hydrothermal method.R-MNCA@CC-2(molar ratio of Ni:Co:Al is 1:1:1)performs the best with the largest specific capacitance,1,742 F/g at 1 A/g,increased by 797%and 1,489%compared to that of NiCoAl-LDH and Ramsdellite-MnO_(2).The capacitance retention rate of the R-MNCA@CC-2//AC@CC supercapacitor is 80.1%after 5,000 cycles at 0.8 A/*** overpotential for driving an OER to reach 10 m/cm^(2)is only 276 mV,which is lower than that of commercial IrO_(2)(300 mV).Noteworthy,we propose a view that is“competing to trigger redox re-action”of electrochemical active sites in LDH during electrochemical processes derived from a discrepancy between theory and experimental results.

关键词： Supercapacitors Oxygen evolution reaction MnO_(2)@NiCoAl-LDH composites Microstructure optimization Electrochemical mechanism

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