共查询到20条相似文献,搜索用时 62 毫秒
1.
针对烧结余热回收存在的余热利用率不高、生产不稳定的难题,采用分析方法对某钢铁厂烧结余热回收系统进行研究,建立了评价系统运行效率的效率模型,并对不同运行工况下系统效率进行了计算分析.在此基础上,建立效率优化模型,并通过粒子群算法进行求解.根据不同入口余热资源量动态地调整蒸汽参数设定值,从而增加系统对变工况运行环境的适应能力.基于工业运行数据的仿真结果表明,动态优化法可使烧结余热回收系统的效率提高4%~11%. 相似文献
2.
《集美大学学报(自然科学版)》2014,(2)
介绍了当前一般船用柴油机的余热回收装置,对特定型号主机废气余热回收装置进行平衡分析,通过计算求出了该装置的分配及利用情况,以及各装置效率的潜在提高程度.结果表明,该余热回收装置具有较高的效率和较好的经济性.分析的结果可以指导人们合理的提高的利用效率. 相似文献
3.
通过调研国内炼铁系统余热余能资源量及回收利用现状,对高炉炼铁系统进行了热量和质量平衡分析,并分析了烧结、焦化、炼铁工序的节能潜力。介绍了CMC、CDQ、TRT、CCPP等炼铁系统的主要节能技术及应用现状,最后对烧结余热的回收原则及发电技术的研发进行了探讨。 相似文献
4.
通过调研国内炼铁系统余热余能资源量及回收利用现状,对高炉炼铁系统进行了热量和质量平衡分析,并分析了烧结、焦化、炼铁工序的节能潜力.介绍了CMC、CDQ、TRT、CCPP等炼铁系统的主要节能技术及应用现状,最后对烧结余热的回收原则及发电技术的研发进行了探讨. 相似文献
5.
6.
《东华大学学报(自然科学版)》2015,(6)
确定了用于丝光印染淡碱回收的热泵蒸发技术的工艺流程,运用分析法对系统的主要部件建立了分析模型,并根据系统的平衡原则,计算得到的平衡相对误差仅为1.1%,具有足够的精度,满足工程计算和分析要求.分析结果表明:系统效率为4.8%,压缩机、蒸发器、水泵及排放的损失是系统损失的主要部分,分别为36.9%,31.2%,19.0%和9.2%.由此可见,热泵蒸发技术虽然充分回收利用了二次蒸汽的余热,具有较高的热效率,但效率仍然很低,且损失主要来自压缩机及蒸发器,占总数的68%.因此系统在设计及改进时,应着重减少压缩机和蒸发器的不可逆损失,压缩机工作时尽量接近绝热压缩过程,提高定熵效率,而在蒸发器中尽量选择较小的传热温差. 相似文献
7.
烧结余热发电高温烟气阀门设计 总被引:1,自引:0,他引:1
烧结工序的能耗指标与先进国家相比差距较大,每吨烧结矿的平均能耗要高20千克标准煤,节能潜力很大.烧结工序的能耗约占冶金总能耗的10%~12%.而其排放的余热约占总能耗热能的49%.在烧结矿生产过程中,特别是烧结矿由鼓风式环冷机冷却过程中会排出大量温度为250~400℃的低温烟气,其热能量大约为烧结矿热耗量的30%左右.实现能源梯级利用的高效性和经济性角度分析,余热发电是最为有效的余热利用途径,平均每吨烧结矿产生的烟气余热回收可发电20千瓦时,折合吨钢综合能耗可降低8千克标准煤.余热发电烟气阀门烧结余热发电重要的辅机设备,直接影响烧结和余热电站运行稳定、废气的充分利用以及整个系统运行效率和可靠性,做好高温烟气阀门对烧结余热发电具有重要意义. 相似文献
8.
针对钢铁烧结余热回收过程中的热交换效率优化问题,引入锅炉有效产热量的概念,用于评价余热发电系统的整体运行效率,提出基于中压锅炉有效产热量优化的余热回收过程操作参数设定方法.首先应用BP神经网络对中压锅炉有效产热量进行预测,基于热力学原理建立有效产热量优化模型;然后采用一种改进的粒子群优化算法求解优化模型,得出有效产热量最大时中压蒸汽温度和环冷机速度的优化设定值.基于工业运行数据的仿真结果表明,所提方法可以使烧结余热回收系统的有效产热量平均提高5%左右,从而提高余热发电效率. 相似文献
9.
《中国石油大学学报(自然科学版)》2017,(4)
通过褐煤提质联产油工艺(LFC)实验装置进行芒来褐煤热解提质实验,取得流程模拟中需要的原始数据,在对LFC工艺流程模拟的基础上,对其进行分析,计算各操作单元的损失,分析损失产生的原因,指出提高效率的方法。结果表明:原煤处理量为1000.00 kg/h时,须补充甲烷37.80 kg/h;损失的主要原因是由于热量传递的不可逆性和化学反应的不可逆性;LFC工艺的效率为74.39%,可以通过改进工艺、回收利用半焦和热解气的物理来提高系统的效率。 相似文献
10.
利用黑箱和灰箱模型对氯化铵回收三效降膜蒸发系统进行了分析,找到了系统损的关键,即二次蒸汽的消耗引起的外部损.对各效蒸发器采用白箱模型,分析了蒸发器损的主要环节,结果表明,对于一、二、三效蒸发器,传热温差引起的损率分别为77.64%、68.59%和75.87%,降低传热温差引起的损是提高蒸发系统效率的主要途径.由于浓缩热引起的损也是不容忽视的,应提高系统的真空度,采用低温蒸发路线. 相似文献
11.
QING Hai-ruo 《成都理工大学学报(自然科学版)》2004,31(6)
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
12.
YUJia-shun HEZhen-hua 《成都理工大学学报(自然科学版)》2004,31(6):694-698
AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod… 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.
海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化 总被引:9,自引:1,他引:9
本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。 相似文献
15.
Yan Yun’an 《华南师范大学学报(自然科学版)》2014,(6):136-137
Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with 相似文献
16.
Yuriko Aoki 《华南师范大学学报(自然科学版)》2014,46(6):135-135
The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to 相似文献
17.
18.
The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time. 相似文献
19.
R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree). 相似文献
20.
The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included. 相似文献