EXPERIMENTAL INVESTIGATIONS ON PRESSURIZED FLUIDIZED BED COMBUSTION(PFBC)FOR HIGH ASH COAL

The first phase of the experimental investigation in our institute on pressur-ized fluidized bed combustion(PFBC)technology is introduced,and the results of fivetests are presented.The combustion efficiencies were as high as 97% 98% when high ashcontent coal was burnt in PFBC,and the sulphur retention efficiencics were 80%-85%with the Ca/S mole ratios between 1.5-1.8.The particulate content in flue gas at the out-let of high temperature gas clean-up system was 189mg/m~3(normalized).The average di-ameter of particles was 2.5-3μm and the weight fraction of particles with diameter largerthan 10μm was not greater than 3%.     

煤在增压流化床 O2／CO2气氛下的燃烧及污染物排放特性

在空气和 O2／CO2气氛下进行烟煤和褐煤的燃烧实验以考察压力和气氛对煤燃烧以及 CO,NO,SO2析出过程的影响．采用排放峰值与排放总量2个指标来评估压力、气氛和温度等操作参数对煤在增压流化床富氧燃烧过程中 NO 及 SO2生成的影响．结果表明：煤在增压富氧燃烧时 CO,NO 和 SO2析出规律和增压空气燃烧时的规律相似,各组分气体均呈现单峰析出;O2／CO2气氛下,压力从0．1 MPa 提高到0．7 MPa会抑制 NO 和 SO2生成;随着温度的升高,NO 和 SO2的排放峰值和总量均增大,常压时两者增加的幅度要高于加压时．     

宜兴南部溶洞发育机制及其模式

根据宜兴南部溶洞的全面调查,阐明了岩石成分与结构、地质构造、地下水动力与水化学、区域自然环境和人类活动等对溶洞发育的影响。并提出了层面溶洞发育模式和羽状溶洞发育模式。     

“燃烧热测定”教学实验的改进

本文介绍了在燃烧热的测定实验中采用双孔带槽模底,单、双股燃烧丝相结合的挂样片法,代替单孔或无孔模底,单股燃烧丝接触样片法,以及压片操作技法。四年的实践表明,这种实验方法大大提高了实验的成功率,缩短了实验操作时间。     

INVESTIGATION INTO REDUCTION CHARACTERISTICS OF NO IN HIGH TEMPERATURE COMBUSTION PRODUCTS

ＩＮＶＥＳＴＩＧＡＴＩＯＮＩＮＴＯＲＥＤＵＣＴＩＯＮＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＮＯＩＮＨＩＧＨＴＥＭＰＥＲＡＴＵＲＥＣＯＭＢＵＳＴＩＯＮＰＲＯＤＵＣＴＳＳｕＳｈｉ（苏适）ＣａｉＳｏｎｇ（蔡崧）ＸｕＹｉｑｉａｎ（徐益谦）（Ｔｈｅｒｍｏｅｎｅｒｇ...     

EXPERIMENTAL STUDY OF GAS—SOLID SUSPENSION FLOWS IN VORTEXING FLUIDIZED BED CHAMBER FREEBOARD

Gas flows and particle mass flux were measured and clutriation experimentswere conducted in two cold test models of vortexing fluidized bed(VFB).The experimen-tal results show that the secondary air injected tangentially creates strong vortexes,estab-lishes particle suspension layers and internal circulation,and suppresses the elutriation offine particles greatly.The vortexing fluidized bed combustion has bright prospect bccauseof its much higher combustion efficiency and desulphidation efficiency than bubblingfluidized bed combustion due to long particle residence time and high slip velocity betweengas and solid,and its simpler configuration and lower cost than circulating fluidized bedcombustion.     

部分气化联合循环发电系统热力性能分析

针对增压部分气化2种增压流化床(PFB)锅炉半焦燃烧和2种常压流化床(CFB)半焦燃烧的先进增压流化床燃烧联合循环(APFBC-CC)方案,进行了系统热力性能计算, 分析比较了主要参数对系统性能的影响. 结果表明,将PFB锅炉高温烟气引入部分气化炉的方案一避开了高温烟气过滤式除尘器, 但降低了煤气热值和系统效率; 方案二则可获得较高的系统效率, 然而高温过滤式除尘器目前技术上有一定困难, 需降温运行; 方案三、四采用CFB锅炉半焦燃烧系统, 其中方案四采用气化空气/蒸汽预热方法, 不仅可获得较高的煤气热值, 而且可提高系统效率.     

INTEGRATION AND REGULATION MATTERS IN EDUCATIONAL TRANSITION: A THEORETICAL CRITIQUE OF RETENTION AND ATTRITION MODELS

ABSTRACT: This paper examines the appropriateness of models developed to understand why students do or do not complete their courses in higher education. It is suggested that emphasising integration above regulation has taken attention away from a possible anomic interpretation. A more contextualised, nuanced and psychosocial approach to understanding student participation and retention is needed to address difficulties and inequalities in the transition to higher education.     

经济史的史学范式与经济学范式

经济史有史学与经济学两种范式,各自归属于历史学和经济学两个学科范畴。两种范式在合作与争夺中产生和发展着,既有联系又有区别,理清二者的关系,有助于正确认识经济史学科的当前形态和今后发展趋势。     

ANALYSIS AND DECISION OF A COAL TIPPLE

ＡＮＡＬＹＳＩＳＡＮＤＤＥＣＩＳＩＯＮＯＦＡＣＯＡＬＴＩＰＰＬＥＷａｎｇＣｈａｎｇｚｈｏｕ（王昌周）（ＤｅｐａｒｔｍｅｎｔｏｆＣｏｍｐｕｔｅｒＳｃｉｅｎｃｅａｎｄＴｅｃｈｎｏｌｏｇｙ）ＪｉａｎｓＢｉｎｇｌｅｉ（蒋冰蕾）（ＤｅｐａｒｔｍｅｎｔｏｆＴｒａ...     

基于LUCC的内蒙古人地关系地域系统调控模式初探

内蒙古地区由于其自然生态环境的脆弱性以及人类长期以来不合理的土地利用，目前毁林开荒和开垦草原、土地沙漠化、草原退化等土地利用／覆盖变化（LUCC）过程极其严峻，应该尽快建立和完善土地利用／覆盖变化动态监测体系、资源与环境法律体系、土地利用可持续管理体系和退化土地生态重建工程体系，实施基于可持续发展理念的人地关系地域系统调控模式。     

THE BEHAVIOR OF A CLASS OF EPIDEMIOLOGICAL MODEL WITH POPULATION DYNAMICS AND NONLINEAR INFECTIOUS RATE

ＴＨＥＢＥＨＡＶＩＯＲＯＦＡＣＬＡＳＳＯＦＥＰＩＤＥＭＩＯＬＯＧＩＣＡＬＭＯＤＥＬＷＩＴＨＰＯＰＵＬＡＴＩＯＮＤＹＮＡＭＩＣＳＡＮＤＮＯＮＬＩＮＥＡＲＩＮＦＥＣＴＩＯＵＳＲＡＴＥＤｏｎｇＭｅｉｆａｎｇ（董梅芳）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａ...     

脂肪酮燃烧热和生成热与分子结构关系的探讨

本文用图论方法探讨了气态脂肪酮的燃烧热和生成热与分子结构的关系,提出了一个结构基础明确的定量关系。计算结果表明,脂肪酮燃烧热和生成热计算值与实验值的一致性令人满意。应用本文定量关系,不仅能够预测脂肪酮的燃烧和生成热,而且能够合理表征物质结构与性能之间的关系。     

Bi_2O_3对低温燃烧合成堇青石粉性能的影响

采用X射线衍射、扫描电镜和EDS能谱分析等手段研究了Bi2O3对低温燃烧法制备的非化学计量组成的MgO-Al2O3-SiO2三元系堇青石基微晶玻璃的相变和烧结特性的影响.研究结果表明:添加Bi2O3能明显促进μ-堇青石向α-堇青石的相转变或促进α-堇青石相的直接析晶,使α-堇青石相的析出温度从1050°C降到900°C;Bi2O3的加入可促进玻璃粉体的烧结致密化;Bi2O3的添加量以5%(质量分数)左右为宜,加入量太大会阻止微晶玻璃的晶化.     

THE ROLE OF STUDENT INVOLVEMENT AND PERCEPTIONS OF INTEGRATION IN A CAUSAL MODEL OF STUDENT PERSISTENCE

This study uses a revised integrated model ofundergraduate persistence to examine first-yearretention at a private, highly selective researchuniversity. Findings from the study provide strongsupport for use of the model in futurestudies.     

PCDD/FS EMISSION IN A 150T/D MSW AND COAL CO-FIRING FLUIDIZED BED INCINERATOR

Ａｂｓｔｒａｃｔ :　ＩｎｃｉｎｅｒａｔｉｏｎａｓａｍｅｔｈｏｄｏｆｒｅｄｕｃｉｎｇＭｕｎｉｃｉｐａｌＳｏｌｉｄＷａｓｔｅ (ＭＳＷ)ｖｏｌｕｍｅａｎｄｒｅｃｏｖｅｒｙｏｆｅｎｅｒ ｇｙｈａｓｂｅｅｎｄｅｖｅｌｏｐｅｄｇｒａｄｕａｌｌｙｉｎＣｈｉｎａ .Ｍｏｒｅａｔｔｅｎｔｉｏｎｉｓｐａｉｄｏｎｐｏｌｙｃｈｌｏｒｉｎａｔｅｄｄｉｂｅｎｚｏ ｐ ｄｉｏｘｉｎｓａｎｄｐｏｌｙｃｈｌｏｒｉｎａｔｅｄｄｉｂｅｎｚｏｆｕｒａｎｓ (ＰＣＤＤ Ｆｓ)ｆｏｒｍｅｄｉｎＭＳＷｉｎｃｉｎｅｒａｔｉｏｎｐｒｏｃｅｓｓ .Ｔｈｉｓｐ…     

上海、重庆企业职工对技能认识的分类及其影响因素:三水平分析

本研究以上海和重庆第二、三产业7040名职工为对象,运用多水平模型分析职工对工作技能的认识及分类,以及个人因素和企业因素对职工对技能重要性认识的影响。第一水平分析使用测量模型根据职工对20个工作技能重要性的认识将之分为五类,即:个人工作习惯和特点、交流能力、解决问题能力、岗位工作需要的操作技能和完成岗位工作需要的一般职业能力。这五种技能又可以归为通用技能和与工作有关的技能两大类。第二、三水平的分析显示,个人特征是解释职工对不同技能因子重要性认识差异的主要因素,在职培训对于改变职工对技重要性的认识起重要作用。