基于传统街区更新的城市设计

以南京市小西湖地块为例，深入探 讨城市设计在传统街区城市更新中的基础、 角色、手段及成果形式。以提高市民的生活 品质、提高容积率、保护历史地段结构和提 升公共空间品质为目标，本着社会公平立场、 城市记忆立场与城市传统街区风貌保护的立 场，通过基于历史成因的和基于整体市民利 益的两种分配方式，城市设计最终认可城市 形态动态变化的合理性、扩大居民/市民/游 人共享的公共空间、实现居民与建设主体多 方获益。     

高密度聚乙烯装置循环气冷却器腐蚀原因分析及防护

针对高密度聚乙烯装置循环气冷却器在使用中存在的腐蚀问题进行分析。通过采用相应的防护办法,取得良好的效果。     

A green sulfonated carbon-based catalyst derived from coffee residue for esterification

A green sulfonated carbon-based catalyst was successfully synthesized through sulfonation of incompletely carbonized coffee residue (SCAC catalyst). The sulfonation temperature was investigated and the catalytic activity was tested via esterification of caprylic acid. SCAC-200, the highest caprylic acid conversion at 4 h (71.5%) and initial TOF based on SO₃H acid sites, was synthesized under a carbonization temperature of 600 °C for 4 h and sulfonation temperature of 200 °C for 18 h. Sulfonation temperature plays a dominant role in determining the SO₃H site density of SCAC catalysts because side reactions (condensation/oxidation/dehydrogenation) take place at high sulfonation temperature as indicated by oxygen-to-carbon surface ratio. The activities of the SCAC catalysts were also substantially greater than that of Amberlyst-15. A high catalytic activity and catalyst stability for esterification of HCp were achieved in the SCAC catalysts with high surface area and by balancing strong (SO₃H) and weak (carboxylic and phenolic) acid site densities. Additionally, this catalyst could be regenerated to obtain essentially its initial catalytic activity by MeOH washing. Therefore, the sulfonated coffee residue derived catalyst is promising, economic eco-friendly and potentially substituted for homogeneous H₂SO₄ catalyst for esterification in industries in the near future.     

Acceleration of regeneration treatment for nanostructured bainitic steel welding by static recrystallisation

Abstract

In order to accelerate bainite transformation during regeneration treatment following nanostructured bainite steel welding, static recrystallisation mechanism is adopted to refine the coarse grain size during two-pass welding. Large mechanical deformation was introduced into the coarse grain zone of the first weld pass, where static recrystallisation would occur with thermal effect of the second weld pass. Static recrystallisation kinetics of nanostructure bainite was studied by two-pass hot deformation experiments. The explicit temperature function of two-pass welding was presented, and effect of welding parameters on static recrystallisation of the deformed coarse grain zone was analysed. Experimental results showed that grains in original coarse grain zone were greatly refined and that nanostructured bainite regeneration was remarkably accelerated.     

延迟焦化装置放空冷却系统存在问题及对策

某1 Mt/a延迟焦化装置放空冷却系统采用闭式塔内冷却技术,运行过程中出现外甩污油量大、不凝气外排造成全厂火炬系统负荷较大、放空塔顶含硫污水含油率过高造成酸性水汽提装置换热器结垢等问题,同时对延迟焦化装置提出回炼全厂污油的要求.为解决以上问题,装置停工检修过程中对放空冷却系统进行改造,主要内容为:增加放空塔底加热器;增加污油至焦炭塔顶大油气管线做急冷油管线;增加破乳剂注入及不凝气回收系统.改造后可实现该装置自产污油及全厂污油做焦炭塔顶急冷油、放空塔顶酸性水满足酸性水汽提装置进料要求及年回收约2 000 t不凝气等,实现了环保及经济效益的综合效果.     

多重角色介入下重庆黄桷坪501仓库的更新

本文从政府、艺术工作者、企业三方关系的角度出发,对501仓库的更新模式进行了分析,并讨论了在重庆黄桷坪501仓库更新过程中不同角色的利益需求和角色作为,其中艺术工作者作为直接的获益者对物质空间的更新起了主导作用。本文主要从外部环境、建筑整体空间和室内空间三方面研究了501仓库的更新过程,分析了更新前后企业和艺术工作者的角色博弈和角色局限性。政府的介入匡正了角色关系,角色之间走向合作。501仓库更新过程中角色关系的变化表明,只有多重角色共同合作才能保证旧工业建筑的可持续更新。     

加快江西矿产资源产业循环经济发展的对策与建议

文章简要分析了江西省矿产资源开发利用的现状和存在的主要问题。认为要促进江西矿产资源产业和国民经济可持续发展,就必须大力发展循环经济,并根据实际情况提出了相应的对策建议。     

法国洛代夫铀水冶厂工艺流程的改进——碱性浸出剂再生及溶液返回法

洛代夫铀水冶厂原采用加压碱法浸出和直接沉淀的流程从矿石中回收铀。本文叙述了作者为改进洛代夫铀水冶厂的生产，提出的碱性浸出剂再生和溶液循环的新方法。在不必更新和增加设备的条件下，改进了该厂的生产工艺流程，提高了经济效益，降低了生产成本。该方法已直接用于洛代夫厂的生产中，并为该厂节省至少每年1400万法郎的操作费用。     

经济全球化大背景下资源循环再利用问题思考

循环经济是以最少的资源消耗和最小的环境代价实现经济效益的最大化。本文以入世后的经济全球化为背景，在确保国家经济安全的前提下，从资源利用的战略取向入手，探讨促进循环利用的政策调整以及二次利用产业体系的构筑。     

脱碳高闪气回收装置项目总结

通过采用真空变压吸附工艺(VPSA)回收四套湿法脱碳装置高闪气中的有效成分,既回收了有效气体(H2回收率达92%),减少了二氧化碳排放,还带来了巨大的经济效益。