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动态校核枯竭气藏型地下储气库的存气量 被引量:1
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作者 谭羽非 《油气储运》 CAS 北大核心 2003年第6期36-40,共5页
利用城市附近枯竭气藏建立的用于调峰的地下储气库 ,在运行过程中常发生渗漏 ,导致地下储气库的实际存气量低于帐面上的存气量。将数值模拟法与参数自动拟合法相结合 ,动态确定储气库压力随时间的变化状况 ,通过调整实际注采量 ,拟合计... 利用城市附近枯竭气藏建立的用于调峰的地下储气库 ,在运行过程中常发生渗漏 ,导致地下储气库的实际存气量低于帐面上的存气量。将数值模拟法与参数自动拟合法相结合 ,动态确定储气库压力随时间的变化状况 ,通过调整实际注采量 ,拟合计算压力与实测压力 ,得出储气库渗漏量 ,由帐面上的存气量减去渗漏量 ,即可以算出储气库的实际存气量。模拟算例的计算结果表明 ,该方法能在储气库动态运行时校核实际存气量 ,确定渗漏路线 ,并通过调整储运方式减少渗漏 ,为提高注采率提供理论依据。 展开更多
关键词 动态校核 枯竭气藏型地下储气库 存气量 数学模型 注采量 渗漏量
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给水管道水压试验中存气量对试验的影响分析 被引量:2
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作者 刘乃力 《山西建筑》 2011年第5期117-118,共2页
结合GB 50268-2008给水排水管道工程施工及验收规范,对给水管道试验中存气量对试验的影响进行了分析,探讨了管内存有空气对试压的影响及验收时有可能造成的判定偏差,以期引起相关工作人员的重视。
关键词 给水管道 存气量 水压试验 补水量
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加油站埋地管道水压试验工艺优化
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作者 高帅 单双 +3 位作者 李敏 邢紫纹 陈喆 竺柏康 《广州化工》 CAS 2013年第23期133-134,共2页
为了使管道的强度和严密性达到设计的规定,往往在管道安装完毕或检修后对输油管道进行压力试验,目前输油管道压力试验的通常做法是采用水压试验。本文对水压试验法中的压力容积试压方法的优缺点和适用条件进行分析,并结合GB50268-2008... 为了使管道的强度和严密性达到设计的规定,往往在管道安装完毕或检修后对输油管道进行压力试验,目前输油管道压力试验的通常做法是采用水压试验。本文对水压试验法中的压力容积试压方法的优缺点和适用条件进行分析,并结合GB50268-2008给水排水管道工程施工及验收规范,对水压试验管道中存气量产生的原因以及对水压试验的影响进行进一步分析,提出了减少存气量的方法,从而达到优化现有水压试验工艺的目的。 展开更多
关键词 水压试验 压力容积 存气量 补水量
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Influence of A-type Zeolite on Methane Hydrate Formation 被引量:8
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作者 臧小亚 杜建伟 +2 位作者 梁德青 樊栓狮 唐翠萍 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第5期854-859,共6页
The porous medium has an important effect on hydrate formation.In this paper,the formation process and the gas storage capacity of the methane hydrate were investigated with A-type zeolite and Sodium Dodecyl Sulfate (... The porous medium has an important effect on hydrate formation.In this paper,the formation process and the gas storage capacity of the methane hydrate were investigated with A-type zeolite and Sodium Dodecyl Sulfate (SDS) existing in the system.The results show that A-type zeolite can influence methane hydrate formation.At the temperature of 273.5 K and pressure of 8.3 MPa,the distilled water with A-type zeolite can form methane hydrate with gaseous methane in 12 hours.The formation process of the system with A-type zeolite was quite steady and the amount of A-type zeolite can influence the gas storage capacity significantly.The adding of A-type zeolite with 0.067 g·(g water)-1 into 2×10-3 g·g-1 SDS-water solution can increase the gas storage capacity,and the maximum increase rate was 31%.Simultaneously the promotion effect on hydrate formation of 3A-type zeolite is much more obvious than that of 5A-type zeolite when the water adding amounts are 0.033 g·g-1 and 0.067 g·g-1 at the experimental conditions. 展开更多
关键词 HYDRATE FORMATION gas storage A-type zeolite
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Cereal Storage Techniques: A Review
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作者 Hatice Pekmez 《Journal of Agricultural Science and Technology(B)》 2016年第2期67-71,共5页
Cereal grains are stored to preserve the product from storing to consuming without any quality loss. The choice of the most suitable and economical store has great importance on storage period of cereals under conside... Cereal grains are stored to preserve the product from storing to consuming without any quality loss. The choice of the most suitable and economical store has great importance on storage period of cereals under consideration of climate conditions, types of grain and transportation facility. The aim of present study was to give information about different cereal storage methods and discuss the most preferable technique for stock keepers. There are five main storage methods for the cereals, i.e., bulk storage, storage in underground pit, storage in bags, storage in sheds and storage in silos. Each has many advantages and disadvantages. Grains are usually preserved as bulk stack in horizontal stores. Nowadays, the storage underground is not preferred in cereal industry. For long-term storage period, cereals are unfavorable when stored as bulk in bags. Location, moisture content and sufficient ventilation are important factors for cereals stored in sheds. The most preferred storage technique in plants is to keep the products in silos. Steel and galvanized silos are the most common ones when compared with the others. In recent years, convention of storage techniques for grains has been advanced with the innovations, such as aeration, refrigerated storage, modified atmospheric storage and hermetic storage systems. 展开更多
关键词 Storage of cereals bulk underground BAG SHED silo.
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Climatic and Topographical Factors Affecting the Vegetative Carbon Stock of Rangelands in Arid and Semiarid Regions of China
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作者 REN Zhengchao ZHU Huazhong +1 位作者 SHI Hua LIU Xiaoni 《Journal of Resources and Ecology》 CSCD 2016年第6期418-429,共12页
Rangeland systems play an important role in ecological stabilization and the terrestrial carbon cycle in arid and semiarid regions. However, little is known about the vegetative carbon dynamics and climatic and topog-... Rangeland systems play an important role in ecological stabilization and the terrestrial carbon cycle in arid and semiarid regions. However, little is known about the vegetative carbon dynamics and climatic and topog- raphical factors that affect vegetative carbon stock in these rangelands. Our goal was to assess vegetative carbon stock by examining meteorological data in conjunction with NDVI (normalized difference vegetation index) time se- ries datasets from 2001-2012. An improved CASA (Carnegie Ames Stanford Approach) model was then applied to simulate the spatiotemporal dynamic variation of vegetative carbon stock, and analyze its response to climatic and topographical factors. We estimated the vegetative carbon stock of rangeland in Gansu province, China to be 4.4×10^14 gC, increasing linearly at an annual rate of 9.8×10^11 gC. The mean vegetative carbon density of the whole rangeland was 136.5 gC m-2. Vegetative carbon density and total carbon varied temporally and spatially and were highly associated with temperature, precipitation and solar radiation. Vegetative carbon density reached the maximal value on elevation at 2500-3500 m, a slope of 〉30°and easterly aspect. The effect of precipitation, tem- perature and solar radiation on the vegetative carbon density of five rangeland types (desert and salinized meadow, steppe, alpine meadow, shrub and tussock, and marginal grassland in the forest) depends on the acquired quantity of water and heat for rangeland plants at all spatial scales. The results of this study provide new evidence for ex- plaining spatiotemporal heterogeneity in vegetative carbon dynamics and responses to global change for rangeland vegetative carbon stock, and offer a theoretical and practical basis for grassland agriculture management in arid and semiarid regions. 展开更多
关键词 vegetative carbon stock topographical condition climatic environment rangeland system spatio-temporal change
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