柴油机废烟气驱动的热管LiBr制冷机的(火用)分析

工业过程中的废热排放造成了可用能的损失,又造成热污染和环境污染.针对一种利用热管回收废热的LiBr制冷机,采用柴油机烟气废热制冷实测后,对该系统的实测结果进行了火用分析,分析结果表明了这种新型废热LiBr制冷机有效利用了柴油机烟气余热,提高了系统的火用效率.     

柴油机废烟气驱动的热管LiBr制冷机的Yong分析

工业过程中的废热排放造成了可用能的损失，又造成热污染和环境污染。针对一种利用热管回收废热的LiBr制冷机，采用柴油机烟气废热制实测后，对该系统的实测结果进行了Yong分析，分析结果表明了这种新型废热LiBr制冷机有效利用了柴油机烟气余热,提高了系统的Yong效率。     

造纸企业余热回收利用研究

本文介绍了华南地区某大型造纸企业挖掘热力系统节能潜力,实施烟气余热回收和冷凝水回收等余热利用节能改造工程,并分析了该综合余热节能改造方案的工艺技术及技术经济性,通过分析,该综合节能项目节能效果显著,经济效益可观,阐述了该节能改造项目对企业节能减排工作的意义。     

浴池废水余热回收利用及节能分析

针对洗浴废水余热利用率低的现状,就如何提高废水余热利用率,提出了洗浴废水余热回收利用改造方案.分析了废热回收的利用效率及经济性,以及浴池余热回收和利用中需要解决的技术问题,给出了相应的解决方案.采用该方案可减少燃气燃料40%,节省运行费用30%.     

烟气余热利用在火力发电厂的应用与分析

该文介绍了火力发电厂烟气余热回收系统的原理和现状,着重讨论了某火力发电厂的烟气余热回收系统.通过对系统安装位置、温度控制和经济性三个方面进行分析,指出当烟气余热回收装置在系统不同安装位置时,对系统设备安全和经济运行的影响;通过对换热装置出口水温控制策略的阐述,指出在防止系统低温腐蚀的同时,最大程度提高烟气余热装置换热效率的措施;同时得出结论:在湿法脱硫系统的机组中,设置烟气余热回收系统能够有效的提升机组经济效益.     

烧结余热发电系统的火用分析

以某厂烧结余热利用系统为例,建立整个热力系统的一般性效率数学模型,根据现场测试的数据进行分析,结果表明,系统的实际运行效率只有4.6%左右;提出了烧结系统的余热分级回收和阶梯利用原则,通过对烧结烟气的火用分析,采用双压余热发电系统对余热进行动力回收,使效率达到原来的2～4倍,极大地提高了余热利用率,研究结果可为整个烧结系统的设计与改造提供较为科学的依据.     

柴油机复合涡轮余热发电系统及电动热管理用电系统综合节油潜力研究

针对发电复合涡轮余热回收技术对发动机燃油经济性影响的评价及节油潜力的问题,基于自行研制的发电复合涡轮余热回收系统及电动热管理系统,在回收电能得到使用的条件下研究了影响发动机燃油经济性的关键因素及两套系统的综合节油潜力。首先,分别分析了发电复合涡轮转速和发动机入口水温对复合涡轮余热系统的发电功率和热管理电动附件耗电功率的影响,明确了产能及用能的变化规律;其次,基于实测数据分析了试验条件下柴油发动机复合涡轮余热发电与电动热管理用电的实际综合节油能力,明确了影响发动机燃油经济性的关键因素;最后,根据关键因素影响油耗的规律对两套系统的综合节油潜力进行了预测分析。结果显示:柴油发动机在1 300r/min试验转速且负荷分别为25%、50%和75%工况下,复合涡轮发电量均能满足电动热管理附件的用电需求,发动机比油耗与基础发动机相比分别降低7.2%、4%和2.6%;增压涡轮及动力涡轮的等熵效率是影响系统燃油经济性的重要因素,提升等熵效率可降低废气能量回收过程中的泵气损失;在试验转速且负荷为75%工况下,随着等熵效率的提升,比油耗可在实测综合油耗的基础上进一步降低,最大降幅为4.1%,若考虑产、用能平衡策略,则该工况下比油耗可降至180.8g/(kW·h)。所提产、用能方案及分析方法可为基于余热回收技术开展的发动机节能减排研究提供参考。     

夹点分析优化后的油田联合站分布式能源系统特征与节能潜力

胜利油田进入特高含水期,开采难度加大,采油成本上升,节能已成为采油厂成本控制的主要因素,采用燃气轮机或燃气内燃机发电、烟气驱动热泵回收污水余热和加热原油等工艺相结合,可以构建基于天然气的分布式能源系统。通过对传统联合站以及联合站分布式能源系统进行夹点分析,从而实现能流分析优化。基于燃气内燃机变工况能流模型,通过热力模拟进行燃气内燃机的燃烧计算,对水套加热炉加热原油的传统联合站进行夹点分析。基于烟气余热驱动的溴化锂吸收式热泵能流模型,对联合站分布式能源系统进行夹点分析。对联合站分布式能源系统与传统联合站进行了对比分析,联合站分布式能源系统节能潜力达24%,为实现“双碳”目标做出了贡献。     

浅谈无氧化炉能源节能方案

本文通过对热镀锌连续退火工艺无氧化炉的研究和分析,结合实际情况,提出了连续退火炉的无氧化炉段排放烟气余热回收改造方案,在充分利用原有设备设施的基础上,对无氧化炉段助燃空气和排放烟气流程进行改造,并对改造后的效果进行了分析,取得了良好的经济效益。     

吹风气回收余热锅炉蒸汽温度控制

在介绍吹风气余热回收工艺流程的基础上,详细阐述了回收余热锅炉蒸汽温度的控制方案及控制过程,对其所产生的经济效益进行了分析。     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-