锅炉节能蓄热器的研究

该文介绍了适合负荷波动较大时应用的锅炉蓄热器工作原理、设计和校核方法。并对１０ｔ／ｈ链条炉设计了变压蓄热器，使该炉能满足短期最高负荷１４．５ｔ／ｈ和最低负荷７ｔ／ｈ的同时，保证锅炉在设计工况附近运行。锅炉热效率由加装蓄热器前的６１．７５％提高到７６％，年节约标准煤２８４３．８ｔ能取得显著的节能效果．     

用稳燃腔煤粉燃烧器改燃烟煤为燃无烟煤锅炉

针对一台７５ｔ／ｈ锅炉，利用稳燃腔煤粉燃烧器，并实施其他相关改造，成功地将原设计一直燃用烟煤改燃无烟煤，并取得了改造后的锅炉燃用无烟煤６０％负荷下不抽油稳燃的良好效果。     

35t／h煤粉锅炉改循环流化床锅炉的研究

介绍了某公司的一台３５ｔ／ｈ煤粉锅炉改循环流化床锅炉的设计与运行,结果表明,改造后的循环流化床锅炉不仅能达到４０ｔ／ｈ的额定蒸发量,而且操作性能稳定,煤种适应性广、负荷调节范围大,达到了节能降耗和降低生产成本的目的。     

AZD20t／h抛煤机锅炉的改造设计

本文主要介绍一种ＡＺＤ２０ｔ／ｈ抛煤机锅炉的改造方案，通过对炉排的改造、炉膛结构的改变，以及采取炉内飞灰分离措施，改进二次风系统，使该型锅炉达到更新换代之目的，既解决了冒黑烟问题，又提高了锅炉热效率。     

“75t／h热电站煤粉锅炉多变量微机控制系统”通过专家鉴定

“７５ｔ／ｈ热电站煤粉锅炉多变量微机控制系统”通过专家鉴定由我校自动化系与淮化集团有限公司合作完成的安徽省科委重点研究项目“７５ｔ／ｈ热电站煤粉锅炉多变量微机控制系统”于１９９６年１０月２８日通过专家鉴定。国内外目前电站煤粉锅炉主要采用仪表控制，少数...     

60t／h中试增压流化床锅炉蒸汽负荷调节特性

增压流化床锅炉主要有两种负荷调节方法：一是改变密相床高度，二是改变床温，本文以即将在徐州安装搬运的６０ｔ／ｈ增压流化床锅炉为对象，通过计算对上述两种调节手段进行了比较。结果表明，只改变床温，负荷的调节范围很有限（７９．３％～１００％）；而利用改变密相床高的方法，可在较大范围内（５５．５％～１００％）调节锅炉负荷，若同时调节床高和床温则可获得更大的负荷调节范围，且过热器出口的蒸汽温度变化幅度也很小。     

协调PH-磷酸盐控制在锅炉炉内水处理中的应用

１问题的提出及解决方案的确定陕西兴化集团有限责任公司使用的锅炉为两台中压汽包燃煤锅炉（型号：ＳＧ３５／３９－Ｍ４３９，压力３．８２Ｍｐａ，蒸发量为３５ｔ／ｈ），其给水原采用软化水，控制指标为：Ｈｔ＜０．０１５ｍｍｏｌ／Ｌ，Ａｔ＝０．５～１．０ｍｍｏｌ／ＬＰＨ＞７。炉内采用加磷酸三钠处理，控制指标锅炉内：Ａｔ＜１２．５ｍｍｏｌ／Ｌ，ＰＯ４３－＝５～１５ｍｇ／Ｌ，ＰＨ＜１０，相对碱度（ＮａＯＨ／溶解固形物）＜０．２。公司一期软水系统改造完成后，锅炉给水采用一级除盐水，其各项指标如表１。表１一级除盐水水质指标测定项目ＨｔＡｔＮａ＋Ｃｌ－ＳｉＯ３２－ＰＨ电导率μｍｏｌ／ｌμｍｏｌ／ｌμｇ／ｌμｇ／ｌμｇ／ｌμｓ／ｃｍ测量数据１．７７５４７４０６７．６８０．８由于锅炉给水已采用了除盐水，炉内处理还采用过去的方法——磷酸三钠处理，即不合理也不经济，这是因为：①给水的碱度已经下降到０．１ｍｍｏｌ／Ｌ以下：炉水碱度如要控制在原来的水平，必然要大量投加Ｎａ３ＰＯ４，这既不经济，也很难保证相对碱度＜０．２。②除盐水中盐离子含量的大量减少，蒸汽已不可能携带大量的杂质，而大量投加的磷酸三钠将成为影响蒸汽品质的主要杂质来源。③给水硬度...     

喷射鼓泡烟气脱硫（Ⅱ）

该文介绍了喷射鼓泡烟气脱硫在工业锅炉上应用的情况。喷射鼓泡烟气脱硫工艺石灰浆液配制系统、脱硫除尘反应系统和产物处理系统等组成。喷射鼓泡反应器（ＪＢＲ）集脱硫除尘于一体，具有气体压降小、液气比高，能达到９０％以脱硫率和９５％以上的除法率等特点。ＪＢＲ硫的设备投资与运行费用低，１ｔ／ｈ锅炉的设备投资约为１．２５万元，去除１ｔＳＯ２的费用约１２５元。ＪＢＲ脱硫系统操作容易而稳定，没有结垢问题，表现出推广     

Banach空间微分方程初值问题弱解的一个存在性定理

在弱耗散型条件ｌｉｍ／ｈ→０＾－１／ｈ［｜ψ（ｘ－ｙ＋ｈ（ｆ（ｔ，ｘ）－ｆ（ｔ，ｙ）））｜－ψ（ｘ－ｙ）｜］≤ｇ（ｔ，｜ψ（ｘ－ｙ）｜）下给出了Ｂａｎａｃｈ空间常微分方程初值问题弱解的一个存在性定理。     

下排气中温分离器型循环流化床锅炉的研究与设计

根据我国循环流化床锅炉燃煤宽筛分的特点，从循环倍率和密相区吸热量、燃烧分额、出口温度及分离效率等关系深入分析了密相区热量平衡，对中温下排气分离器内三维速度场进行分析研究，并以４１０ｔ／ｈ循环流化床锅炉方案设计为例，提出了宽筛分，中、低循环倍率，中温下排气分离器，Ⅱ型布置的循环流化床的构思。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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