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Effect of secondary air on NO emission in a 440 t/h circulating fluidized bed boiler based on CPFD method

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Particuology 2023年第12期83卷 18-31页

作者： Hongpeng Liu Haiwen Sun Ye Bi Chunxia Jia lei Zhang Yanlong Li Hong qin qing Wang Engineering Research Centre of Oil Shale Comprehensive Utilization Ministry of EducationSchool of Energy and Power EngineeringNortheast Electric Power UniversityJilin132012China Department of Chemical&Biological Engineering University of British ColumbiaVancouverV6T1Z3Canada Northeast Branch of Huadian Electric Power Research Institute Co. LtdShenyang110000China

The 440 t/h circulating fluidized bed boiler was numerically simulated by the Computational Particle Fluid Dynamics(CPFD)*** combustion characteristics of circulating fluidized bed boiler and the effect of secondary air on NO emission were *** full-scale three-dimensional model of a 440 t/h circulating fluidized bed boiler was *** rationality of the grid was validated by the experimental data of material layer *** accuracy of the simulation was validated by measuring the temperature of each measuring point in the dense phase *** combustion conditions in the furnace under different setting modes were *** effects of secondary air rates on NO formation in fluidized bed were *** results show that when the secondary air rate increases to 27%,the proper secondary air rate has a positive effect on the inhibition of NO generation,and the proper strengthening of the central air supply will improve the permeability of the secondary air and make the combustion more uniform and *** the secondary air rate increases to 33%,excessive improvement of air classification and central air distribution will affect the stability of circulating fluidized bed ***,air classification and strengthening of central air supply can be used together to inhibit the generation of NO.

关键词： Circulatingfluidized bed Low nitrogen combustion Computational particlefluid dynamics (CPFD) Numerical simulation Secondary air

Insight into relationship between composition,thickness and electrochemistry behavior of oxide film formed on TA15under different potentials in 0.5 mol·L^(-1)H_(2)SO_(4)

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Rare Metals 2023年第5期42卷 1760-1772页

作者： Fei-Fei Huang Yi qin qing-Rui Wang Hiroaki Yoshida lei Wen Hai Chang Ying Jin National Center for Materials Service Safety University of Science and Technology BeijingBeijing100083China Innovation Group of Marine Engineering Materials and Corrosion Control Southern Marine Science and Engineering Guangdong LaboratoryZhuhai519080China Department of Physical Science Hiroshima UniversityHigashi-Hiroshima739-8526Japan

The oxide film formed on TA15 alloy in0.5 mol·L^(-1)H_(2)SO_(4)at different applied potentials is investigated by evaluating the film formation current density,film thickness,surface film composition,valence state,and the electrochemical *** relative quantitative spectral analysis revealed by X-ray photoelectron spectroscopy(XPS)and X-ray absorption spectra(XAS)shows that the increasing applied potential promotes the formation of thick and high-valence state *** contrasting with XAS of the reference titanium oxides,it is found that TiO_(2)within the oxide film changes from anatase type to rutile type with the potential increases to 2.00 *** oxide film formed at passive region has better protection performance,and with the increase of applied potential,the corrosion resistance of passive film increases,whereas the ND(donor density)values obtained from the Mott-Schottky(MS)results decrease with the increasing applied potential,indicating a better uniformity and protective effect of the oxide *** on above facts,the model of the oxide films formed on TA15 at different applied potentials in passive region and dissolve region is ***,the existence forms of all the TA15alloying elements under the most corrosion resistant condition are confirmed.

关键词： TA15 Electrochemical passivation Corrosion behavior Surface compositions and structures

Thermal cracking characteristics of n-decane in the rectangular and circular tubes

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Chinese Journal of Chemical Engineering 2019年第12期27卷 2876-2883页

作者： Zhiliang lei Bin Liu qin Huang Kuo He Zewei Bao Quan zhu Xiangyuan Li School of Chemical Engineering Sichuan UniversityChengdu 610065China

To investigate the effect of regenerative cooling channel geometry on pyrolysis of endothermic hydrocarbon fuel,a series of supercritical pyrolysis experiments of n-decane in the rectangular and circular tubes were ***,sensitivity analysis of production of propylene and methane as well as CFD simulation were also *** results showed that gas yield and conversion in the circular tube with an inner diameter of 2 mm had a similar tendency with the one of 1.5 mm in inner *** conversion in the circular tube was much less than that in the rectangular tube at the same outlet *** heat sink of the rectangular tube at the same outlet temperature was larger than that of circular tubes,but the temperature at the corner of the rectangular tube was relatively *** to the experimental data of the test tubes,a correlation between the conversion and the temperature in the rectangular and circular tubes at the same outlet temperature was fitted,providing a reference for the design of regenerative cooling channels.

关键词： Hydrocarbons Supercritical fluid Pyrolysis Rectangular tube Circular tube

Comparative analysis of the ecological fitness and transcriptome between two genotypes of the brown planthopper Nilaparvata lugens

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Journal of Integrative Agriculture 2020年第6期19卷 1501-1511页

作者： LIU Kai CHEN Zhan SU qin YUE lei CHEN Wei-wen ZHANG Wen-qing State Key Laboratory of Biocontrol/School of Life Sciences Sun Yat-sen UniversityGuangzhou 510275P.R.China

Insect quantity is an important index for determining the degree of damage to *** brown planthopper(BPH),Nilaparvata lugens(Stal),is one of the most important rice pests in ***,we used two genotypes of BPH,a highfecundity genotype(HFG)and a low-fecundity genotype(LFG),to measure their ecological fitness and to explore possible causes for genotype differentiation by transcriptome *** results showed that there were significant differences in body weight,egg hatching rate and honeydew secretion between the HFG and LFG,particularly,the number of eggs laid per female was more *** analysis showed that a total of 1966 differentially expressed genes(DEGs)were mainly involved in energy metabolism,carbohydrate and lipid syn thesis,in sect horm one syn thesis and fecun dity-related ***,we found that the phosphorylation levels of AMPK,AKT and FoxO and the synthesis of ecdysone were different between the two genotypes of *** findings may partially explain the differenee in the ecological fitness between HFG and *** study is the first to compare the differences between two genotypes of BPH and to provide transcriptomic evidenee to further understand the fecundity of BPH.

关键词： Nilaparvata lugens genotype fecundity RNA-seq phosphorylation

Structural Designs for Accommodating Volume Expansion in Sodium Ion Batteries

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Chinese Journal of Chemistry 2018年第9期36卷 866-874页

作者： Wenjie Wang Xiaohui zhu Yujing Zhang yongiun Liu qin Zhang lei Fu College of Chemistry and Molecular Science Wuhan University Wuhan Hubei 430072 China The Institute for Advanced Studies (IAS) Wuhan University WuhanHubei 430072 China

T At the forefront of energy storage field, developing sodium ion batteries （SIBs） has drew a wide concern due to relatively low cost and abundant resource, comparing with lithium ion batteries （LIBs）. Serious volume expansion constraints the electrochemical performance of the conver- sion/alloying materials, despite of their high reversible capacities or theoretical capacities. Here, from the perspective of structural designs, we systemat- ically study four types of routes to accommodate volume expansion. Delicate and peculiar nanostructures based on nanocrystallization engineering are widely focused on, covering nanosheet assembly and nanoarray construction. Robust materials such as carbon-based materials can be utilized as the buffer matrix, mitigating the mechanical stress during the charge/discharge process. Besides, recent studies have demonstrated void space reservation in nanostructures was also beneficial for adapting to volume changes. Moreover, for conversion materials, numerous works have confirmed the advanta- geous influence of interlayer spacing regulation. We also explained the superiority and challenges for further giving scope to structural designs. Sketching out the future studies in SIBs, in situ characterizations are supposed to be highlighted, as well as in-depth researches on the stress evolution caused by volume expansion.

关键词： sodium ion batteries volume expansion structural design buffer matrix void space

STUDY ON MECHANICAL INTERACTIONS BETWEEN SINGLE CARDIAC MYOCYTE AND ELASTIC SUBSTRATE

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Acta Mechanica Solida Sinica 2009年第6期22卷 563-570页

作者： Jianyong Huang Tao zhu lei qin Xiaoling Peng Chunyang Xiong Jing Fang Department of Biomedical Engineering Peking University Beijing 100871 China Academy for Advanced Interdisciplinary Studies Peking University Beijing 100871 China Institute of Vascular Medicine Peking University Third Hospital Beijing 100083 China

Quantitative investigation on mechanical characteristics of cardiac myocytes has important physiological significance. Based on elastic substrate technique, this paper develops a set of algorithms for high-efficiency cellular traction recovery. By applying a gradient-based digital image correlation method to track randomly distributed fluorescence microbeads on the deformed substrate induced by single cardiac myocyte, high-resolution substrate displacement field can readily be obtained. By using a numerical algorithm based on the integral Boussinesq solution, cell-substrate tractions are reconstructed in a stable and reliable manner. Finally, spatiotemporal dynamics of a single cardiac myocyte is investigated as it adheres to a polyacrylamide elastic substrate.

关键词： cardiac myocyte elastic substrate deformation digital image correlation traction recovery contraction work intensity

Effects of hydrocarbon physical properties on caprock’s capillary sealing ability

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Science China Earth Sciences 2010年第5期53卷 665-671页

作者： LinYe Zhang YouShu Bao qing Liu ShouChun Zhang RiFang zhu lei Zhang 1. Geology Scientific Research Institute SinoPec Shengli Oilfield Company Dongying 257015 China

A new mechanics formula of caprock’s capillary sealing ability has been established in this paper, in which the boundary layer resistance was considered and characterized by starting pressure gradient. The formula shows that capillary sealing ability of caprock is determined not only by the capillary force of rock and the buoyancy of hydrocarbon column, but also by the starting pressure gradient of hydrocarbons and the thickness of caprock. The buoyancy of hydrocarbon column, the starting pressure gradient of hydrocarbon, and the capillary force of caprock are affected by hydrocarbon density, hydrocarbon viscosity, and hydrocarbon-water interface tension respectively. Based on hydrocarbon property data of reservoirs of Jiyang Depression and equations from literature, the effects of hydrocarbon density, hydrocarbon viscosity, and hydrocarbon-water interface tension on the sealing ability of caprock are analyzed. Under formational conditions, the sealing ability of oil caprock can vary up to dozens times because of the variations of the oil density, oil viscosity, and oil-water interface tension. Thus, the physical characters of hydrocarbon should be considered when evaluating the capillary sealing ability of caprocks. Study of the effects of physical characters on sealing ability of caprock can provide guidance to exploring special physical property hydrocarbon resources, such as viscous oils, and hydrocarbon resources in special pressure-temperature environments.

关键词： caprock capillary sealing ability boundary layer resistance starting pressure gradient hydrocarbon physical property non-Darcy flow heavy oil

Distribution and mechanism of gently dipping fractures subjected to river incision: A case study from Nujiang River, China

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Journal of Mountain Science 2018年第1期15卷 211-224页

作者： zhu lei HUANG Run-qiu YAN Ming CHEN Guo-qing WEI Wei State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology College of architecture and urban planning Sichuan Agricultural University

Gently dipping fractures subjected to river incision are widely distributed on rock *** this paper,a rock slope on the Nujiang River(China)is investigated to study the role of gently dipping fractures in the rock slopes *** field surveys indicate that gentle fractures are concentrated in four main ***,the kinematics of the fracture system suggest that the genesis of these fractures can be synthesized into a progressive evolution *** model indicates that the joints begin with the formation of an array of en echelon cracks that are subjected to continued crack elongation and shearing before ultimately approaching one another and interacting to form a complex joint *** analysis is performed to reveal the mechanisms of this genesis,and three main fracture patterns are identified based on the slope stress and are classified with respect to the slope *** on the detail field investigations and the evolutionary history of the river valley,we propose that intermittent incision by the river was the main factor contributing to the concentrated distribution of gently dipping joints.

关键词： Joints Rock slope Distribution Fracture mode Genesis mechanism

Constituents from Aerial Parts of Bidens ceruna L. and Their DPPH Radical Scavenging Activity

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Chemical Research in Chinese Universities 2009年第3期25卷 328-331页

作者： zhu Na LI Xu-wen LIU Gui-ying SHI Xiao-lei GUI Ming-yu SUN Chang-qing JIN yong-ri College of Chemistry Jilin University Changchun 130012 P. R. China

A new chalcone glycoside, butein-4-methoxyl-4′-O-（6＂-O-acetyl）-β-D-glucopyranoside（2）, along with seven known compounds, namely, quercitrin（1）, luteolin-7-O-β-D-glucopyranoside（3）, butein-4＇-O-β-D-glucopyranoside（4）, butein-4-methoxyl-4＇-O-β-D-glucopyranoside（5）, butin-7-O-β-D-glucopyranoside（6）, isoquercitrin（7）, and sulfurein（8） was isolated from aerial parts of Bidens ceruna L. Their structures were elucidated on the basis of spectroscopic studies. Compounds 1-8 were tested for their DPPH radical scavenging activity and, except compounds 2 and 5, other compounds showed scavenging activitv.

关键词： Bidens ceruna L. Constituent Flavonoid DPPH radical Scavenging activity