首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 46 毫秒
1.
脉冲电晕放电是一种能同时脱除烟气中SO2,NOx和飞灰颗粒的新方法。然而在一个电晕放电试验装置上的试验首次发现,在脱除NOx的同时产生了一定量的N_O,而且随着电压和停留时间及NOx初始浓度的增大,N_2O量也增大。试验还发现,电晕放电对N_2O无分解作用,空气中的氮气在电晕中不生成N2O,脱硫及喷氮脱硫不生成N2O,SO2和NH3对N_2O的生成无影响。讨论了脉冲电晕放电脱硝中N2O生成的机理。  相似文献   

2.
脉冲电晕放电是一种能同时脱除烟气中SO2,NOx和飞灰颗粒的新方法,然而在一个电晕放电试验装置上的试验首次发现,在脱除NOx的同时产生了一定量的N2O,而且随着电压和停留时间及NOx初始浓度的增大,N2O量也增大。试验还发现,电晕放电对N2O无分解作用,空气中的氮气在电晕中不生成N2O,脱硫及喷氨脱硫不生成N2O,SO2和NH3对N2O的生成元影响。讨论了脉冲电晕放电脱硝中N2O生成的机理。  相似文献   

3.
对脉冲电晕放电烟气脱硫脱硝反应器结构进行了改进。实验结果表明,改进后的胍应器对脱除烟气中的氮氧化物有比较明显的效果。NO脱除率提高5%以上NOx(NO+NO2)脱除率提高12%以上。  相似文献   

4.
在一台循环流化床实验台上,研究了石灰石脱硫过程中N_2O/SO_x/NO_x浓度的变化,并在空床上进行了再燃烧法脱除N2O的实验,结果表明,石灰石脱硫会使NOx少量增加,再燃烧法可以在不增加NOx的同时使N_2O大大降低;再燃燃料的挥发分含量越高,N2O的消减率越高;气体停留时间越长,N2O的分解率越高;低氧量对再燃烧法消减N2O有利  相似文献   

5.
流化床煤燃烧N2O,SOx及NOx的消减   总被引:3,自引:0,他引:3  
在一台循环流化床实验台,研究了石灰石脱硫过程中N2O/SOx/NOx浓度的变化,并在空床上进行了再煤燃烧脱除N2O的实验,结果表明,石灰石脱硫全吏NOx少量增加,再燃烧法可以在不增加NOx的同时使N2O大大降低,再燃燃料的挥发含量越高,N2O的消减率越高;气体停留时间越长,N2O的分解率越高;低氧量对现燃烧法消减N2O有利。  相似文献   

6.
钼硅酸化学吸收同时去除气流中的SO2和NOx   总被引:8,自引:0,他引:8  
对钼硅酸溶液脱除废气中的SO2和NOx及其吸收机理进行了研究,实验结果表明,钼硅酸能十分有效地吸收SO2并使杂多酸还原为杂多兰;而杂多兰则能还原NOx为N2,从而达到同时去除SO2和NOx的目的。  相似文献   

7.
钼硅酸化学吸收同时去除气流中的SO_2和NO_x赵有才,徐迪民,陈绍伟,李国建对铂硅酸溶液脱除废气中的SO2和NOx及其吸收机理进行了研究.实验结果表明,钼硅酸能十分有效地吸收SO2并使杂多酸还原为杂多兰,而杂多兰则能还原NOx为N2,从而达到同时去除...  相似文献   

8.
石油焦燃烧过程中NO_x和SO_2析出规律的研究   总被引:1,自引:0,他引:1  
在卧式加热炉和富氧条件下,对石油焦在燃烧过程中的NOx 和SO2 析出规律进行研究,发现石油焦的NOx 和SO2 析出受多种因素的影响:温度增加,NOx 的析出量增加;颗粒粒径增加,NOx 和SO2 的析出量减少;石灰石微量增加,NOx 的浓度降低,石灰石过量增加,NOx 的浓度反而升高,石灰石的增加使SO2 降低;NOx 的析出并不与N 的质量分数成正比,SO2 的析出与S的质量分数成正比.结合这些实验现象,从机理上对它们进行解析.  相似文献   

9.
在卧式加热炉和富氧条件下,对石油焦在燃烧过程中的NOx和SO2析出规律进行研究,发现石油焦的NOx和SO2析出受多种因素的影响,温度增加,NOx的析出量增加,颗粒粒径增加,NOx和SO2的析出量减少;石灰石微量增加,NOx的浓度降低,石灰过量增加,NOx的浓度反而升高,石灰石的增另使唤降低;NOx的析出并不与N的质量分数成正比,SO2的析出与SD的质量分数成正比,结合这些实验现象,从机理上对它们进  相似文献   

10.
燃烧过程排放的氮氧化物气体是危害很大,很难处理的大气污染物。降低燃烧过程中的NOx排放有两类方法:一是降低NOx的原始形成,第二类是还原已形成的NOx;在还原已形成的NOx方法中,再燃烧是当今世界前景看好的低NOx控制技术,它是利用燃料分级形成还原性所氛迫x的分解来降低NOx形成的燃烧方法。  相似文献   

11.
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.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
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.  相似文献   

13.
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.  相似文献   

14.
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。  相似文献   

15.
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.  相似文献   

16.
王慧 《科技信息》2008,(10):240-240
Wuthering Heights, Emily Bronte's only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.  相似文献   

17.
The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.  相似文献   

18.
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.  相似文献   

19.
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.  相似文献   

20.
The non-orthogonal localized molecular orbital(NOLMO)is the most localized representation of electronic degrees of freedom.As such,NOLMOs are thus potentially the most efficient for linear scaling calculations of electronic structures for large systems.However,direct ab initio calculations with NOLMO have not been fully implemented and widely used,partly because of the slow convergence issue in the optimization of NOLMO.We devel-  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号