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水资源区域共享与长距离输水模式探索
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作者 赖一飞 王元媛 《工程建设与设计》 2024年第20期61-63,共3页
阐述了水资源区域共享中存在的问题,介绍了水资源区域共享实现方式中的两种长距离输水模式,并从输水钢管的防护、远距离障碍物、水锤效应及管道损坏等方面详细分析了长距离输水的关键问题,同时提出了细化设计方案。
关键词 资源 区域共享 长距离 输水模式
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“环路输水模式”在北京市供水系统中的应用分析 被引量:2
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作者 杨进新 刘进 +1 位作者 王雷 李万智 《水利水电技术》 CSCD 北大核心 2012年第3期49-54,共6页
根据北京市南水北调水资源配置方案、水厂布局、调蓄系统规划,输水系统引入城市"环路输水模式",优化了北京市供水系统。"环路输水模式"的闭合、互相相通、双向输水、互为备用、可靠性高、调度灵活等特点,使北京市... 根据北京市南水北调水资源配置方案、水厂布局、调蓄系统规划,输水系统引入城市"环路输水模式",优化了北京市供水系统。"环路输水模式"的闭合、互相相通、双向输水、互为备用、可靠性高、调度灵活等特点,使北京市供水系统实现了"三水"(即:外调水、本地地表水和地下水)联合调度,降低了调蓄库规模,提高了供水保证率,有效地解决了北京市近、远期供水需求,为国内大、中城市输水管路建设做出了新的尝试,提出了新的思路。 展开更多
关键词 环路输水模式 系统 联合调度 北调工程 北京
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南疆干旱区“坎儿井”式输配水系统模式研究 被引量:2
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作者 毛远辉 刘江 张鲁鲁 《陕西水利》 2023年第10期96-98,共3页
围绕新疆山区水库替代平原水库调蓄功能的总体布局,结合南疆灌区不同的分布特点及骨干工程的输水方式,研究灌区节水控水的改造方案。通过将南疆骨干输水系统“明改暗”示范分析,在具备水源保障(水库有调蓄沉沙能力)、自压管道输水、有... 围绕新疆山区水库替代平原水库调蓄功能的总体布局,结合南疆灌区不同的分布特点及骨干工程的输水方式,研究灌区节水控水的改造方案。通过将南疆骨干输水系统“明改暗”示范分析,在具备水源保障(水库有调蓄沉沙能力)、自压管道输水、有二次沉沙条件且环境影响小,高标准农田程度高和地下水超采灌区等条件下,采取干旱区“坎儿井”式输配水系统模式,可切实提高水资源的利用效率,具有较好地推广应用价值。可为干旱区深度节水控水和灌区高标准农田改造提供指导和借鉴。 展开更多
关键词 南疆 干旱区 新时代“坎儿井”输水模式
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南疆农业节水潜力与措施分析 被引量:8
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作者 李江 李志军 张鲁鲁 《中国水利》 2023年第3期30-34,50,共6页
通过对新疆南疆地区水资源、蓄水工程、灌区状况及农业节水现状的调查梳理,总结研判南疆农业节水存在的主要问题,并对当前节水面临的形势及农业节水潜力进行分析研究,提出构建包括开源、节流、增效三部分措施在内的新时代南疆农业节水... 通过对新疆南疆地区水资源、蓄水工程、灌区状况及农业节水现状的调查梳理,总结研判南疆农业节水存在的主要问题,并对当前节水面临的形势及农业节水潜力进行分析研究,提出构建包括开源、节流、增效三部分措施在内的新时代南疆农业节水体系。“开源”即新建山区水库增加调蓄库容、山区水库替代平原水库功能改造、加大微咸水使用力度;“节流”即应用现代“坎儿井”模式,对骨干渠系进行防渗改造和管道化能力提升;“增效”即兴建高标准农田、推广“干播湿出”等农艺节水措施、调整种植业结构、精细化管理和深化农业水价综合改革等深度节水控水措施,以期达到“节水控用、节水保安、节水增绿、节水提效”的目标。 展开更多
关键词 南疆 农业节潜力 措施分析 现代“坎儿井”输水模式
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A Revised CFB Wall-to-suspension Heat Transfer Model
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作者 苏亚欣 《Journal of Donghua University(English Edition)》 EI CAS 2005年第1期97-101,共5页
Based on the Cluster Renewal Model of the particle motion in a CFB riser, a revised heat transfer model is developed, which introduces the latest research results of the hydrodynamics of the suspension flow in CFB. Th... Based on the Cluster Renewal Model of the particle motion in a CFB riser, a revised heat transfer model is developed, which introduces the latest research results of the hydrodynamics of the suspension flow in CFB. This model divides the heat transfer into two parts, which are due to the transient heat conduction by the covered clusters and the convection between the uncovered wall and the dispersed phase. Radiation at high temperature is regarded as being additive. The fraction of the covered wall by clusters is revised by a new formula, which is a function of the operating condition and the particle properties. The radiation between the dispersed phase and the uncovered wall includes not only the direct radiation to the uncovered wall, but also the radiation to the clusters and then reflected to the uncovered wall. Calculation was carried out for the CFB heat transfer model. The results were compared with the published typical experimental data of other researchers and showed a good agreement between them. 展开更多
关键词 circulating fluidized bed heat transfer model cluster renewal model modification.
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Heat resistance and water protection effectiveness for large single-pane fireproof glass
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作者 邵荃 李芳 +1 位作者 陈涛 孙占辉 《Journal of Central South University》 SCIE EI CAS 2011年第6期2185-2191,共7页
The effects and heat transfer mode of water film and sprinkler system on the heat-resistant property associated with the insulation of a fireproof glass were investigated. In the experiments, fireproof glass with a si... The effects and heat transfer mode of water film and sprinkler system on the heat-resistant property associated with the insulation of a fireproof glass were investigated. In the experiments, fireproof glass with a size of 3 300 mm (height)×2 200 mm (width) ×12 mm (thickness) was exposed to an oil pool fire with a power of approximately 1.4 MW. The experimental results show that the application of the water film or sprinkler system on the glass can effectively resist the intensive heat from the fire in the test due to the absorption of latent heat. The permitted period of integrity and insulation with a water film and a sprinkler system could be extended to 60 min. It should be noted that the temperature of the glass surface Can be kept under 60℃in a 60 min test. The experimental results suggest that it is feasible to substitute fireproof glass with water film for a fireproof door as long as the water film or sprinkler system can work stably and water can cover the whole surface of the frreproof glass. 展开更多
关键词 water film sprinkler system HEAT-RESISTANCE fireproof glass fire test
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Sealing Ability of Spherical Hull Transfer Skirts
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作者 卢骏锋 赵耀 《Journal of Marine Science and Application》 2010年第1期48-53,共6页
An improved spherical, movable transfer skirt for autonomous submersibles has been devised. It was designed to permit the transfer of equipment and personnel from a submersible to the pressure chamber of an oil storag... An improved spherical, movable transfer skirt for autonomous submersibles has been devised. It was designed to permit the transfer of equipment and personnel from a submersible to the pressure chamber of an oil storage sea-bed structure. It also allowed mating at large vertical angles while the submersible remained horizontal. Seal failure modes and procedures for analyzing the sealing ability of the mating flange of the hull transfer skirt were thoroughly analyzed using conservative estimation methods. In the analysis, sea currents and mating angles were considered. Results showed that when considering the effects of currents, spherical radius and mating angle, their influence on seal ring failure should be considered first. The critical mating depth for a seal ring failure was larger than for either sliding or rotational failure modes. The critical mating depth can be used to determine the mating method of the submersible. The analytical procedures and results can be used as a reference for the design of spherical hull transfer skirts. 展开更多
关键词 SUBMERSIBLE transfer skin sealing ability sea current
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