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Influence of SO_2 in incineration flue gas on the sequestration of CO_2 by municipal solid waste incinerator fly ash

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Journal of Environmental Sciences 2013年第4期25卷 735-740页

作者： jianguo jiang Sicong Tian Chang Zhang School of Environment Tsinghua University Key Laboratory for Solid Waste Management and Environment Safety Ministry of Education of China

The influence of CO2 content and presence of SO2 on the sequestration of CO2 by municipal solid waste incinerator （MSWI） fly ash was studied by investigating the carbonation reaction of MSWI fly ash with different combinations of simulated flue gas. The reaction between fly ash and 100% CO2 was relatively fast; the uptake of CO2 reached 87 g CO2/kg ash, and the sequestered CO2 could be entirely released at high temperatures. When CO2 content was reduced to 12%, the reaction rate decreased; the uptake fell to 41 g CO2/kg ash, and 70.7% of the sequestered CO2 could be released. With 12% CO2 in the presence of SO2, the reaction rate significantly decreased; the uptake was just 17 g CO2/kg ash, and only 52.9% of the sequestered CO2 could be released. SO2 in the simulated gas restricted the ability of fly ash to sequester CO2 because it blocked the pores of the ash.

关键词： municipal solid waste incinerator fly ash SO2 accelerated carbonation CO2 sequestration simulated incineration flue gas

MINTEQ modeling for evaluating the leaching behavior of heavy metals in MSWI fly ash

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Journal of Environmental Sciences 2008年第11期20卷 1398-1402页

作者： Mang Yan jiang jianguo Chen Maozhe Tsinghua Univ Dept Environm Sci & Engn Beijing 100084 Peoples R China

At present,all kinds of municipal solid waste incineration (MSWI) fly ash stabilization technology has been reported and successfully applied in many ***,leaching procedures are very different that the technologies lack uniform standard,and it is even impossible to predict the long-term *** model can explain the environmental stabilization based on chemical phase and thermodynamic crystal structure,and it is also able to guide the development of environment-friendly stabi...

关键词： MINTEQ model incinerator fly ash stabilization mechanism

Adv Paxos: making classical Paxos more efficient

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The Journal of China Universities of Posts and Telecommunications 2019年第5期26卷 33-40,59页

作者： Li Bin jiang jianguo Yuan Kaiguo Beijing Jiaotong University Beijing 100044China National Secrecy Science and Technology Evaluation Center Beijing 100044China Institute of Information Engineering Chinese Academy of SciencesBeijing 100093China Beijing University of Posts and Telecommunications Beijing 100876China

Paxos is a well-known distributed algorithm that provides strong ***,the original Paxos has several shortcomings,including those of slow elections,redundant communications and excessive traffic of the coordinator *** order to tackle the above deficiencies,the design of advanced edition of Paxos(Adv Paxos)was proposed,which is a new distributed consensus algorithm that is derived from Basic *** paper analyzes the behavior of each character of the original algorithm during each of its *** optimizing the behavior of the proposer and acceptor,a series of behavioral optimization measures was proposed,which included distance related waiting mechanisms,optimization of the number of proposals,self-learning and a reduction in broadcast *** theoretical analysis and experimentation,it is demonstrated that the new algorithm has a lower probability of livelock without a reduction in reliability,faster agreement reaching speeds,lower communication costs among server clusters and higher percentage of successful proposals.

关键词： consensus Paxos behavior optimizing performance

Influence of H_(2)S and NH_(3) on biogas dry reforming using Ni catalyst:a study on single and synergetic effect

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Frontiers of Environmental Science & Engineering 2023年第3期17卷 63-74页

作者： Yuchen Gao jianguo jiang Yuan Meng Tongyao Ju Siyu Han School of Environmental Science and Engineering Tiangong UniversityTianjin 300387China School of Environment Tsinghua UniversityBeijing 100084China

Biogas is a renewable biomass energy source mainly composed of CH4 and CO_(2).Dry reforming is a promising technology for the high-value utilization of *** impurity gases in biogas can not be completely removed after pretreatment,which may affect the performance of dry *** this study,the influence of typical impurities H_(2)S and NH_(3) on dry reforming was studied using Ni/MgO *** results showed that low concentration of H_(2)S in biogas could cause serious deactivation of *** results including EDS,XPS and TOF-SIMS confirmed the adsorption of sulfur on the catalyst surface,which was the cause of catalyst *** used air calcination method to regenerate the sulfur-poisoned catalysts and found that the regeneration temperature higher than 500℃could help catalyst recover the original ***_(3)in the concentration range of 50–10000 ppm showed a slight inhibitory effect on biogas dry *** decline rate of biogas conversion efficiency increased with the increase of NH_(3) *** was related to the reduction of oxygen activity on catalyst surface caused by NH_(3).The synergetic effect of H_(2)S and NH_(3)in biogas was *** results showed that biogas conversion decreased faster under the coexistence of H_(2)S and NH_(3)than under the effect of H_(2)S alone,so as the surface oxygen activity of *** calcination regeneration could also recover the activity of the deactivated catalyst under the synergetic effect of H_(2)S and NH_(3).

关键词： Biogas Dryreforming Suifur poisoning Ammonia Synergetic effect Hydrogen

Lag compensation errors in active power filters based on DSP controllers

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Mining Science and Technology 2010年第2期20卷 312-316页

作者： WANG, Xuedan jiang, jianguo GAO, Baichen school of information and electrical engineering china university of mining & technologyxuzhou 221008china school of electrical and information engineering heilongjiang institute of science and tech school of information and electrical engineering china university of mining & technologyxuzhou 221008china school of electrical and information engineering heilongjiang institute of science and technologyharbin 150027china

The growing problems of harmonic pollution on coal mine power lines caused by high-power DC drive systems has increased the use of active power *** analyzed compensation errors caused by the time lag in the detecting circuits of an active power filter based on DSP *** derived a mathematical model for the compensation error starting from the error estimation when a single distortion frequency is *** model was then extended to the case where multiple frequencies are present in the distortion.A formula for a general theory of compensation error with fixed load and fixed lag time is *** theoretical analysis and experimental results show that the delay time of an active power filter mainly arises from the sampling *** sampling frequencies introduce larger compensation errors in the active power filter reference current.

关键词： active power filter digital signal processing modeling compensation error

Process optimization and mechanism study of ionic liquid-based mixed amine biphasic solvents for CO_(2) capture in biogas upgrading procedure

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Frontiers of Environmental Science & Engineering 2024年第8期18卷 43-57页

作者： Fanzhi Meng Siyu Han Li Lin Jinglin Li Kailun Chen jianguo jiang School of Environment Tsinghua UniversityBeijing 100084China

This study focused on enhancing the efficiency of methane upgrading and reducing energy consumption in the biogas upgrading process through the use of biphasic *** aqueous-based biphasic solvent,comprising methyl monoethanolamine(MMEA),N-methyldiethanolamine(MDEA),and 1-butyl-3-methylimidazolium tetrafluoroborate(ItFB),was meticulously *** biogas upgrading effect,regeneration efficiency,regeneration energy consumption,economic viability,selectivity,and phase separation characteristics of this absorbent were systematically *** parameters,including different inlet flow rates,stirring rate,methane inlet concentrations,reaction temperatures,and amine mixing ratios,were adjusted to investigate their impact.A comprehensive evaluation was conducted on the biogas upgrading effect and substance migration trends of the biphasic *** process parameters were determined,demonstrating the favorable impact of the biphasic solvent on biogas *** upgraded gas achieved a methane purity exceeding 96%,and the regeneration energy consumption decreased by 44.27% compared to 30 wt.%MEA,resulting in a more than 50% improvement in economic *** interaction between the ionic liquid and carbamate facilitated the phase separation process,with carbon enrichment after separation exceeding 95%.This enhancement significantly contributed to the improvement of regeneration energy *** study thus concludes that biphasic solvents,exemplified by the described aqueous-based solution,offer a promising avenue for effective biogas upgrading with notable advancements in economic and energy efficiency.

关键词： Biphasic solvents Biogas upgrading Energy consumption Process parameters Ionic liquid

Porous silica synthesis out of coal fly ash with no residue generation and complete silicon separation

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Frontiers of Environmental Science & Engineering 2023年第9期17卷 197-208页

作者： Tongyao Ju Siyu Han Fanzhi Meng Li Lin Jinglin Li Kailun Chen jianguo jiang School of Environment Tsinghua UniversityBeijing 100084China

Ordered mesoporous silica materials exhibit enormous potential in industrial *** coal fly ash(CFA)is abundant in Si,it has become a green and promising way to utilize CFA by synthesizing porous silica ***,the stable crystalline structure of CFA limits the extraction of Si,and the residue is generated during the process of extracting *** this work,we proposed a no-residue method to synthesize ordered mesoporous silica out of *** carbonate(Na_(2)CO_(3))was used to reconstruct the crystals of the CFA,and the calcined mixture then directly reacted with the *** method combined the process of Si extraction and porous material *** this method,no residue was generated and the silicon in both amorphous and crystalline phases of CFA was fully *** this method,the extraction efficiency of Si was increased from 31.75%to nearly 100%.The as-synthesized mesoporous silica had a highly-ordered pore structure with a space group of la-3d,a surface area of 663.87 m^(2)/g,a pore volume of 0.41 cm^(3)/g,and an average pore diameter of 2.73 *** mechanism of crystalline transformation and material structure formation were systematically *** method provides a new idea to dispose of CFA and synthesize porous silica materials.

关键词： Coal fly ash Alkali fusion Micro-/meso-porous Si Zeolite MCM-48 Crystalline transformation

Leaching characteristics of heavy metals during cement stabilization of fly ash from municipal solid waste incinerators

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Frontiers of Environmental Science & Engineering 2008年第3期2卷 358-363页

作者： Shunwen LIANG jianguo jiang Yan ZHANG Xin XU Environment and Sanitary Management Department Shenzhen 518001China Department of Environment Science and Engineering Tsinghua UniversityBeijing 100084China

The leaching characteristics of heavy metals in products of cement stabilization of fly ash from a municipal solid waste incinerator were investigated in this *** stabilization of heavy metals such as Cd,Pb,Cu,and Zn in fly ash from such incinerators was examined through the national standard method in China based on the following factors:additive quantity of cement and Na_(2)S,curing time,and pH of leaching *** results showed that as more additives were used,less heavy metals were leached except for Pb,which is sensitive to pH of the leachate,and the worse effect was observed for *** mass ratio of cement to fly ash=10% is the most appropriate parameter according to the national standard *** the hydration of cement was basically finished,stabilization of heavy metals did not vary after curing for 1 *** mixtures of cement and fly ash had excellent adaptability to environmental *** pH of leachate was maintained at 7 when pH of leaching liquor varied from 3 to 11.

关键词： municipal solid waste(MSW) fly ash heavy metal solidification and stabilization cement

An end-to-end text spotter with text relation networks

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Cybersecurity 2021年第1期4卷 91-103页

作者： jianguo jiang Baole Wei Min Yu Gang Li Boquan Li Chao Liu Min Li Weiqing Huang Institute of Information Engineering Chinese Academy of SciencesBeijingChina School of Cyber Security University of Chinese Academy of ScienceBeijingChina Centre for Cyber Security Research and Innovation Deakin UniversityGeelongAustralia

Reading text in images automatically has become an attractive research topic in computer ***,end-to-end spotting of scene text has attracted significant research attention,and relatively ideal accuracy has been achieved on several ***,most of the existing works overlooked the semantic connection between the scene text instances,and had limitations in situations such as occlusion,blurring,and unseen characters,which result in some semantic information lost in the text *** relevance between texts generally lies in the scene *** the perspective of cognitive psychology,humans often combine the nearby easy-to-recognize texts to infer the unidentifiable *** this paper,we propose a novel graph-based method for intermediate semantic features enhancement,called Text Relation ***,we model the co-occurrence relationship of scene texts as a *** nodes in the graph represent the text instances in a scene image,and the corresponding semantic features are defined as representations of the *** relative positions between text instances are measured as the weights of edges in the established ***,a convolution operation is performed on the graph to aggregate semantic information and enhance the intermediate features corresponding to text *** evaluate the proposed method through comprehensive experiments on several mainstream benchmarks,and get highly competitive *** example,on the SCUT-CTW1500,our method surpasses the previous top works by 2.1%on the word spotting task.

关键词： Scene text spotting Graph convolutional network Visual reasoning