1.0 Mt/a催化裂化装置催化剂跑损原因分析

从催化剂性质、旋分器运行工况、工艺操作条件等方面分析了1.0 Mt/a催化裂化装置催化剂跑损原因,提出了相应整改措施。     

Static safety guarantees for a low-level multithreaded language with regions

We present the design of a formal low-level multithreaded language with advanced region-based memory management and thread synchronization primitives, where well-typed programs are memory safe and race free. In our language, regions and locks are combined in a single hierarchy and are subject to uniform ownership constraints imposed by this hierarchical structure: deallocating a region causes its sub-regions to be deallocated. Similarly, when a region is read/write-protected, then its sub-regions inherit the same access rights. We discuss aspects of the integration and implementation of the formal language within Cyclone and evaluate the performance of code produced by the modified Cyclone compiler against highly optimized C programs using pthreads. Our results show that the performance overhead for guaranteed race freedom and memory safety is in most cases acceptable.     

重油催化裂化装置再生器的设计

再生器是重油催化裂化装置中的关键设备,再生器设计的成功与否,将直接关系到装置能否高效、长周期地运行。随着诸多新技术、新工艺的不断出现,装置的大型化对再生器设备的设计、制造、安装、运行提出了更高的要求。该文就重油催化裂化装置再生器的结构设计、选材的考虑、壳体应力腐蚀预防措施等问题进行了较详细的论述和分析。     

入口挡板对旋风分离器内流动分布影响的试验研究

运用七孔球探针对直切型旋风分离器及入口加挡板结构进行了流场的测量,并对其内部流场进行了研究,指出了随挡板角度变化,流场的变化规律,结果表明随挡板角度变大,切向速度提高,切向速度峰值位置沿径向外移,下行流的轴向速度提高,上行流的轴向速度降低.     

半逆向作业施工法在旋流井土方工程中的应用

介绍了棒材厂在空间比较狭窄的情况下，利用框架式反向（随挖随防护）防护法，成功开挖井底标高为-20．2m的旋流井基础，为类似的深基础开挖提供可借鉴的经验。     

丙烯腈反应器新型两级旋风分离器大型冷模试验研究

针对丙烯腈装置扩能的要求 ,分析了用新型两级旋风分离器取代原三级旋风分离器的必要性 ,采用PV型和PV E型旋风分离器组成新型两级旋风分离器。根据旋风分离器尺寸分类优化设计法 ,设计了一种工业尺寸规模的两级旋风分离器 ,并将它和Ducon型三级旋风分离器在冷态条件下进行了对比试验。结果表明 ,新型两级旋风分离器不仅性能优异 ,而且结构简单、占据空间小、工作可靠 ,适合现有丙烯腈装置扩能改造的需要。     

φ4.0m旋风式选粉机常见问题处理

φ4.0m旋风式选粉机常见的循环风机叶轮磨损，内衬脱落和选粉效率低等问题，通过改善循环风机进风的环境，用混凝土改造内衬和用笼式分级圈改造回转机构等措施，取得了良好的效果。     

Alkali retention/separation during bagasse gasification: a comparison between a fluidised bed and a cyclone gasifier

Biomass fuelled integrated gasification/gas turbines (BIG/GTs) have been found to be one of the most promising technologies to maximise electricity output in the sugar industry. However, biomass fuels contain alkali metals (Na and K) which may be released during the gasification processes and cause deleterious effects on the downstream hardware (e.g. the blades of gas turbines). Much research has therefore been focused on different kinds of gas cleaning. Most of these projects are using a fluidised bed gasifier and includes extensive gas cleaning which leads to a high capital investment.

Increasing alkali retention/separation during the gasification may lead to improved producer gas quality and reduced costs for gas cleaning. However, very little quantitative information is available about the actual potential of this effect. In the present work, comparative bench-scale tests of bagasse gasification were therefore run in an isothermal fluidised bed gasifier and in a cyclone gasifier to evaluate which gasification process is most attractive as regards alkali retention/separation, and to try to elucidate the mechanisms responsible for the retention.

The alkali retention in the fluidised bed gasifier was found to be in the range of 12–4% whereas in the cyclone gasifier the alkali separation was found to be about 70%. No significant coating of the fluidised bed's bed material particles could be observed. The SEM/EDS and the elemental maps of the bed material show that a non-sticky ash matrix consisting of mainly Si, Al and K were distributed in a solid form separated from the particles of bed material. This indicates the formation of a high temperature melting potassium containing silicate phase, which is continuously scavenged and lost from the bed through elutriation.     

高温除尘技术综述

介绍了高温除尘技术的特点,综述了国内外高温除尘设备的现状、水平以及发展趋势,并对该技术在各行业中的应用前景进行了展望。