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Simulation of aggregation effects on co-fired biomass-coal ash in an electrostatic precipitator

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Particuology 2020年第3期18卷 120-126页

作者： jianyi lu Zhe Yang Bingyi Xu Zhiyong Zhou Chenxi Sun MOE Key Laboratory of Resources and Environmental Systems Optimization Beijing 102206China School of Environment Science and Engineering North China Electric Power UniversityBaoding 071003China

Aggregation of fine ash into larger particles benefits fly ash removal in an electrostatic *** aggregation,turbulent aggregation,and electrical aggregation of fine ash (derived from co-firing of biomass fuel and anthracite coal) was simulated under different conditions in an electrostatic precipitator.A population balance model and user-defined function in Fluent were assumed to obtain aggregation kernel functions and calculate the aggregation effects on the co-combusted *** results show that electrical aggregation had an obvious effect on both micron-and submicron-sized *** submicron particles,the effect of thermal aggregation is about ten times greater than turbulent ***,for micron-sized particles,turbulent aggregation is about seven times greater than thermal ***,particle aggregation in the electrostatic precipitator mainly occurs because of electrical aggregation,supplemented by thermal aggregation and turbulent *** the flow velocity is 1.0 m/s,particle volume fraction is 1.4%,and biomass co-firing ratio is 10%,the effects of all three aggregation processes on ash particles are optimized.

关键词： Co-combustion Aggregation Population balance model(PBM) Dust removal Electrostatic precipitator(ESP)

A New Method for the Aging Evaluation of Oil-Paper Insulation Using η-Butanol and Methanol

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 717-726页

作者： jianyi Wang Yuanxiang Zhou Jun Liu Zhaowei Wang Song Bai Jiayu lu Department of High Voltage China Electric Power Research InstituteBeijing 100192China State Key Laboratory of Power Grid Environmental Protection Beijing 100192China Electrical Engineering Department Tsinghua UniversityBeijing 100084China Solar Storage Division of State Key Lab of Power System and Generation Equipment School of Electrical EngineeringXinjiang UniversityUrumqi 830047China State Grid Wuwei Electric Power Supply Company Wuwei 733000China

To improve the accuracy and efficiency of the aging life prediction and assessment of transformer oil-paper insulation,and to make up for the deficiencies of traditional characterizers,such as 2-furfural,carbon monoxide,and carbon dioxide,a method for the simultaneous determination of methanol,ethanol,n−propanol,and η-butanol in oil with a single injection is established by headspace-gas chromatography-mass *** measured results show that the determination limits of the four alcohol characterizers can be controlled to 10μg/kg *** on this method,the change patterns of the above four alcohols with thermal aging time and degree of polymerization are obtained through thermal aging experimental ***,η-propanol,and η-butanol in oil indicate nearly linear correlations with thermal aging time and degree of polymerization,similar to that of *** analyzing 52 sets of measured data of 500 kV EHV transformers in operation,η-butanol is found to have excellent performance,and a new method to evaluate the aging state of oil-paper insulation employing η-butanol and methanol is proposed along with the aging attention value *** measured data of 500 kV EHV transformers in operation indicate that the combination of η-butanol and methanol as the preferred characterizers can effectively compensate for the shortcoming of traditional characterizers in the early stages of aging,and the feasibility of the method is *** possible pathways for the generation of η-butanol by cellulose cleavage during the aging of oil-paper are proposed from the chemical structure of cellulose.

关键词： Aging characterization determination method methanol η-butanol oil-paper insulation 500 kV transformers

A cross-association model for CO_2-methanol and CO_2-ethanol mixtures

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Science China Chemistry 2010年第6期53卷 1438-1444页

作者： FU Dong,YANG Zhuang,lu jianyi & LIU JianMin School of Environmental Science and Engineering,North China Electric Power University,Baoding 071003,China School of Environmental Science and Engineering North China Electric Power University Baoding China

A cross-association model was proposed for CO2-alcohol mixtures based on the statistical associating fluid theory (SAFT).CO2 was treated as a pseudo-associating molecule and both the self-association between alcohol hydroxyls and the cross-association between CO2 and alcohol hydroxyls were *** equilibrium properties from low temperature-pressure to high temperature-pressure were investigated using this *** calculated p-x and p-p diagrams of CO2-methanol and CO2-ethanol mixtures agreed with the experimental *** results showed that when the cross-association was taken into account for Helmholtz free energy,the calculated equilibrium properties could be significantly improved,and the error prediction of the three phase equilibria and triple points in low temperature regions could be avoided.

关键词： CO2-methanol CO2-ethanol cross-association SAFT phase equilibria

Industrial Investment by COFCO

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China's Foreign Trade 1996年第3期 33-34页

作者： lu jianyi Li Dashan

Through hard work over the past decade,the China National Cereals,Oils andFoodstuffs Import and ExportCorporation(COFCO) has made muchheadway in its industrialization.A total of226 industrial enterprises has so far been setup at home and abroad by the corporationand its subsidiaries in this country and *** industrial investment has been directedtowards the development of diversifiedbusinesses centering around major operationon a large scale,at a higher level and in aserial patterm from its original

关键词： Industrial Investment by COFCO

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黄河口人海流路规划中泥沙数学模型的应用

人民黄河 1989年第6期11卷 30-34页

作者：陆俭益黄委会勘测规划设计院

在黄河口入海流路规划中,曾用不同的泥沙数学模型对河口水位变化和入海流路的行河年限进行计算,在各模型关于清水沟流路行河年限计算成果比较中可见,由于计算条件相同,成果的差异不大。此外,作者根据神仙沟和钓口河实测资料,分别推估一... 详细信息

在黄河口入海流路规划中,曾用不同的泥沙数学模型对河口水位变化和入海流路的行河年限进行计算,在各模型关于清水沟流路行河年限计算成果比较中可见,由于计算条件相同,成果的差异不大。此外,作者根据神仙沟和钓口河实测资料,分别推估一定防洪水位下的行河年限,结果与各模型计算值相近。总之,应用泥沙数学模型预估入海流路行河年限作为规划依据是可信的。

关键词：黄河口入海流路规划泥沙数学模

可变增量的EGR控制策略对柴油机瞬态排放的影响

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内燃机学报 2016年第5期34卷 394-400页

作者：田荐伊陆国祥徐宏明伯明翰大学机械工程学院

针对涡轮增压柴油发动机在瞬态工况下因涡轮延迟现象所导致的碳氢化合物(THC)和颗粒物(PM)排放相对较高的问题,研究瞬态工况下废气再循环(EGR)变化率与发动机动力性能和排放性能之间的变化规律,搭建基于AVLPUMA系统的柴油发动机瞬态排... 详细信息

针对涡轮增压柴油发动机在瞬态工况下因涡轮延迟现象所导致的碳氢化合物(THC)和颗粒物(PM)排放相对较高的问题,研究瞬态工况下废气再循环(EGR)变化率与发动机动力性能和排放性能之间的变化规律,搭建基于AVLPUMA系统的柴油发动机瞬态排放测试平台,监测瞬态工况下EGR变化率、进气质量流量与NOx、PM和THC排放物之间的变化关系,在此基础上提出一种可变增量的EGR控制策略.结果表明:通过该策略能够快速有效地降低发动机的喷油量,提高新鲜空气进入气缸的质量流量,提高瞬态空燃比,改善燃烧,最大程度地降低涡轮延迟现象对发动机造成的不利影响;在试验工况条件下,使用该策略可使累计颗粒物排放最高降低83.5%,.

关键词：柴油发动机瞬态工况废气再循环颗粒物排放控制策略

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燃烧过程颗粒物的形成及我国燃烧源分析

环境污染治理技术与设备 2006年第5期7卷 43-47页

作者：吕建燚李定凯吕子安清华大学热科学与动力工程教育部重点实验室北京100084

燃料燃烧会排放一次颗粒物和二次颗粒物,一次颗粒物中亚微米粒子主要是由于无机矿物质经蒸发-成核-凝结-凝并的途径形成的;超微米颗粒的产生不同于亚微米颗粒的形成,是由于破碎机理。二次颗粒物是由气态前驱体在大气中转化而成的。我国... 详细信息

燃料燃烧会排放一次颗粒物和二次颗粒物,一次颗粒物中亚微米粒子主要是由于无机矿物质经蒸发-成核-凝结-凝并的途径形成的;超微米颗粒的产生不同于亚微米颗粒的形成,是由于破碎机理。二次颗粒物是由气态前驱体在大气中转化而成的。我国燃烧源主要是煤燃烧、燃油机动车和农村生活燃料等。深入认识颗粒物的形成及燃烧源的特征对有效控制颗粒物的排放是很有帮助的。

关键词：一次颗粒物二次颗粒物形成机理燃烧源

我国房地产投资影响CPI的机理及实证研究——来自上市公司的样本数据

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建筑经济 2020年第S2期41卷 260-265页

作者：鲁检毅肖鲁赛汐中建信和地产有限公司湖南长沙410004 湖南农业大学经济学院湖南长沙410128

根据2009年6月至2018年6月上市公司的样本数据,通过对于房地产投资影响CPI的机理及实证分析,探讨两者的影响机理和计量关系,实证研究表明民间房地产投资对CPI的拉动作用系数为0.0025,民间房地产投资每增加1个单位对CPI的拉升作用为0.002... 详细信息

根据2009年6月至2018年6月上市公司的样本数据,通过对于房地产投资影响CPI的机理及实证分析,探讨两者的影响机理和计量关系,实证研究表明民间房地产投资对CPI的拉动作用系数为0.0025,民间房地产投资每增加1个单位对CPI的拉升作用为0.0025个单位,为房地产政策的提出和实施提供参考。

关键词：房地产投资 CPI 产业关联度

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论清前期闽台海防对海外贸易的影响

海交史研究 2001年第1期 107-114页

作者：卢建一福建师范大学历史系副教授福州350007

福建是濒海省份,位于亚洲东部南北交通要道,海岸线长达3 051公里,占全国海岸线1/5.台湾岛是中国第一大岛,四面环海,海岸线总长达1 600公里,东濒辽阔太平洋,西隔海峡与福建遥遥相望.台湾海峡是中国与太平洋地区各国海上联系的重要交通枢... 详细信息

福建是濒海省份,位于亚洲东部南北交通要道,海岸线长达3 051公里,占全国海岸线1/5.台湾岛是中国第一大岛,四面环海,海岸线总长达1 600公里,东濒辽阔太平洋,西隔海峡与福建遥遥相望.台湾海峡是中国与太平洋地区各国海上联系的重要交通枢纽,水深不超过200米,浅处仅80米,是大陆架延伸的一部分.这种海洋环境,使两岸安危相系.

关键词：清朝前期福建台湾省海防政策对外贸易