燃气-蒸汽联合循环发电方式分析

分析了燃气-蒸汽联合循环发电的方式及其特点,展望了燃气-蒸汽联合循环发电方式的发展前景,并为“煤的洁净燃烧“开辟了一条高效、低污染发电的新途径.     

燃气-蒸汽联合循环发电机组水汽品质监督中的问题研究

结合了燃气发电和蒸汽发电优点的燃气-蒸汽联合循环发电机组,其中水汽品质是影响机组运行的关键因素。旨在介绍燃气-蒸汽联合循环发电机组水汽系统监督中存在的问题,探讨磷酸盐和氨的添加问题和工艺改良,阐述其对于水汽品质控制的影响,以实际工程案例进行了讲解。     

9F级燃气蒸汽联合循环发电机组性能分析

根据我公司9F级燃气蒸汽联合循环发电机组的运行状况,如对主机参数进行优化匹配,对辅助系统进行优化,提高机组的出力和效率,可以最大限度降低发电成本,可有效提高9F级燃机电厂的竞争力。文章基于此拟主要讨论9F级燃气蒸汽联合循环发电机组性能特点。     

我国发展联合循环机组的背景和条件

介绍了燃气-蒸汽联合循环装置的基本组合方式及其技术发展水平，总结了联合循环发电的主要技术特点和经济特性，分析了国内快速发展联合循环发电的环境条件，并展望了联合循环技术的发展前景。     

环境温度对E级燃气-蒸汽联合循环机组全工况影响

研究对象为PG9171E型燃气轮机为顶循环的联合循环机组,构建了燃气-蒸汽联合循环系统变工况模型.通过改变环境温度及相应边界条件,分析了环境温度对联合循环机组全工况性能及调峰能力的影响情况.结果表明:以性能保证工况作为基准工况,降低大气温度,以冬季工况为代表,其全工况性能优于基准工况,效率比基准工况提高幅度为1.69%~3.75%,其出功增加幅度为11.48%~11.57%;提高大气温度,以夏季工况为代表,其全工况性能劣于基准工况,效率降低幅度为2.56%~5.08%,其出功降低幅度为10.44%~10.58%;对于机组的调峰能力,随着环境温度的升高,机组的调峰能力在降低,-20℃时联合循环机组最大、最小发电负荷分别为47.63,242.62 MW;40℃时最大、最小发电负荷分别为39.14,172.12 MW,全年温度范围内调峰幅度为132~194 MW.      

如何采用煤气化联合循环发电(IGCC)技术

整体煤气化联合循环(IGCC-IntegratedGasificationCombinedCycle)发电系统,是将煤气化技术和高效的联合循环相结合的先进动力系统。它由两大部分组成,即煤的气化与净化部分和燃气-蒸汽联合循环发电部分。第一部分的主要设备有气化炉、空分装置、煤气净化设备(包括硫的回收装置),第二部分的主要设备有燃气轮机发电系统、余热锅炉、蒸汽轮机发电系统。IGCC的工艺过程如下:煤经气化成为中低热值煤气,经过净化,除去煤气中的硫化物、氮化物、粉尘等污染物,变为清洁的气体燃料,然后送入燃气轮机的燃烧室燃烧,加热气体工质以驱动燃气透平作功,燃气轮机排气进入余热锅炉加热给水,产生过热蒸汽驱动蒸汽轮机作功。IGCC技术把高效的燃气-蒸汽联合循环发电系统与洁净的煤气化技术结合起来,既有高发电效率,又有极好的环保性能,是一种有发展前景的洁净煤发电技术。在目前技术水平下,IGCC发电的净效率可达43%～45%,今后可望达到更高。而污染物的排放量仅为常规燃煤电站的1/10,脱硫效率可达99%,二氧化硫排放在25mg/Nm3左右。(目前国家二氧化硫为1200mg/Nm3),氮氧化物排放只有常规电站的15%￣20%,...     

浅析小型燃机发电工程中的几点心得

社会不断发展,科技不断进步,节能减排是提高能源利用效率,减轻环境压力,是促进循环经济发展,实现可持续发展的必由之路;尤其是焦化、炼钢企业利用焦炉煤气、高炉煤气或其他化工产品驰放气式的小型燃气-蒸汽联合循环发电项目正被利用起来。     

焦炉煤气合成甲醇和发电系统的设计及性能分析

为合理利用焦炉煤气,设计了以焦炉煤气为原料的鲁奇气相法甲醇合成系统的工艺流程,基于Aspen Plus软件模拟得到了系统的关键参数;对燃用焦炉煤气的燃气-蒸汽联合循环的性能进行了计算,并与燃用天然气时的性能进行了比较;设计了利用焦炉煤气合成甲醇和发电的并联式多联产系统,并与单产系统的性能进行了比较.结果表明:采用炉前补...     

煤气化循环发电系统的主要组成及特点

煤气化联合循环(IGCC)发电技术是将高效的燃气-蒸汽联合循环发电系统与煤气化技术相结合,既有高效的发电效率,又环保节能,同时还可以组成多联产系统等优点,是一种先进的发电技术,受到了世界各国的高度重视。本文概述了IGCC发电系统的组成、优缺点,指出IGCC发电技术系统的复杂化以及造价成本偏高是影响IGCC发电站推广的主要因素。煤气化联合循环(In-tegrated Gasification Combined Cycle,IGCC)发电技术是指煤在气化炉内和氧气、水蒸气反应产生粗煤气,再经过净化装置对粗煤气进行脱硫、脱硝、除尘等其它大气污染物,将粗煤气变为洁净的气体燃料,燃烧后推动燃气轮机进行发电,并且将高温粗煤气、烟气和水进行热交换,在废热锅炉内产生高温高压水蒸汽推动蒸汽轮机发电,这不仅提高了煤的利用效率,还具有优良的环保性能,为煤的洁净燃烧带来了光明。因此,煤气化联合循环发电技术被认为是21世纪最有发展前途的洁净煤发电技术。     

电子发射式高温高压电除尘器阴极电发射特性试验研究

在不同的温度、压力和电压条件下,对开发出来的阴极材料进行了电发射特性的试验研究。研究结果表明,温度、压力及电压对发射电流均有显著的影响,在高温（〉８００℃）条件下,由阴极材料热发射所获得的电流密度,比通过电晕方式所得到的电流密度至少高一个数量级。阴极板具有良好的稳定性,可在高温高压下长期使用。     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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