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介绍了一种钟罩式气体流量标准装置自动检定系统.系统在现有钟罩装置的基础上,增加了由单片机与上位机组成的二级系统,实现了检定过程的自动控制与数据采集,并且将检定结果存入数据库,便于对检定数据进行管理.该自动检定系统的实现,对于提高气体流量仪表检定的效率和准确度具有实际意义. 相似文献
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汽车油罐车容量检定一般采用容量比较法,容量比较法使用标准金属量器作计量标准器,采用人工读数,工作量大,效率低,劳动强度高,检定结果的质量难以保证.为解决汽车油罐车容量计量检定的落后测量手段,提升现有计量标准装置技术档次,提高检定效率,降低劳动强度,确保量值溯源准确可靠,我单位对油罐车容量检定装置进行了改造,研究开发了自动检定系统. 相似文献
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直角尺检定装置应用于500mm以下00级直角尺垂直度的检定,其技术指标符合《直角尺检定规程》JJG7-2004对200mm~500mm范围00级直角尺的检定要求,支持直角尺检定装置标准器组在国家检定系统中的正常运作。本文叙述了相关装置的设计原理和研制过程。 相似文献
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为提高电流互感器检定效率,在传统检定装置的基础上设计了一种多工位辅助测试台,采用"母线"供电原理对一次测量回路、二次测量回路进行创新设计,通过灵活多样的控制组合,实现了多工位同批检定和多模式应用,有效提高了检定效率。 相似文献
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为了解决气体样品检测分析中遇到诸如气体样品量少、仪器因高压而损坏等问题,该文介绍一种新型的气路切换装置及其工作原理,检测前先使用相对高纯气体吹扫仪器,待仪器稳定后,使用四通阀将样品气体切换至仪器。罗列及比较了不同材料对检测结果的影响,结果表明采用适当的材料、合理的设计、谨慎的操作,可以有效避免外界气体杂质污染。装置实现了快速分析、少量进样,大大提高工作效率,同时可避免不必要的财产损失。 相似文献
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《Advanced Powder Technology》2020,31(6):2244-2256
A numerical model for the flow and filtration characteristics of industrial flue gas in granular bed filter (GBF) was established and the local filtration efficiency for different granule layers was investigated. Numerical validation results show that the GBF structure with large size granules at the inlet region and small size granules at the outlet region can effectively improve the filtration performance of GBF and the underlying mechanism was revealed. Then an experimental system was built to validate the suitability of the optimized GBF structure for the filtration of industrial flue gas with coagulative particles. The experimental results show that the optimized GBF structure is also suitable and its superiority is more significant with the increase of filtration time. The results show that the pressure drop and filtration efficiency of the experimental system increase with the increase of dust particles concentration. The existing of coagulative particles is conducive to the growth of smaller size dust particles, the pressure drop and filtration efficiency increase significantly. In addition, the pressure drop and filtration efficiency decrease with the increase of cooling rate. The results of this study are expected to be useful for the design and optimization of industrial flue gas purification and waste heat recovery. 相似文献
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为了充分消纳清洁能源、提高能源利用效率,综合能源系统的概念应运而生,相较于传统的能源单级利用形式,综合能源系统对电力、冷热和天然气等多种形式能源进行多级利用,通过多能互补提高综合能源利用效率。但是综合能源系统由于系统间耦合紧密,能源流动变化复杂,在优化运行方面相较于传统电网有较大差别。针对综合能源系统优化运行问题的研究现状进行了全面整理,首先介绍了综合能源系统的组成,对电力、热力和天然气的网络潮流模型的研究现状进行了归纳分析;其次对优化运行方法进行了分类总结,分析了现有方法的优缺点和难点;最后进行了展望,指明了综合能源系统优化运行未来的研究方向。 相似文献
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在城市供热领域,燃煤锅炉和燃煤热电厂作为主力供热热源,尚存在着系统排烟温度高,热损失严重的普遍现象。本文提出基于喷淋换热的燃煤锅炉烟气余热回收系统,利用吸收式热泵和喷淋塔有效回收烟气余热,对系统建立模型,并利用工程实测参数进行模型验证,同时从节能减排效果及经济性方面进行评价。结果表明:模型的模拟结果与工程实测值变化趋势一致,绝对误差与相对误差均维持在合理范围内,可认为模型可靠;锅炉热效率达104.5%;CO2、SO2、NOx等污染物排放明显减少,烟气的年冷凝水量可达1.8万t,节能减排潜力巨大;经计算,该系统增量投资回收期为3.96 a,回收期较短,具有较好的经济性。 相似文献
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为了降低高速串行接口的时钟数据恢复(CDR)电路的功耗,在研究、分析现有时钟数据恢复结构的基础上,提出了一种新的时钟数据鉴相算法及其电路实现方法。新的电路设计仅使用一个高速采样时钟,比传统的鉴相电路减少一半的采样率,从而减少了前端采样模块的功耗。该鉴相算法采用统计方法减小鉴相时钟的噪声,进而达到很低的误码率。该鉴相算法可使用数字综合的方法实现,工作在较低的频率下,这样便于迁移到不同的工艺中。整个电路使用40nm工艺实现,实际芯片测试数据表明,使用该电路的接收端可以稳定工作在13Gb/s的速率下,功耗达到0.83p J/bit,误码率低于10E-12。 相似文献
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Shrikant Dhodapkar V. K. Srivastava B. Pitchumani 《Particulate Science and Technology》1986,4(4):419-428
High performance cyclone can be designed using optimisation techniques. Elasticity analysis has been used to demonstrate its utility for optimum design of cyclone. In this paper effectiveness factor, q(q = -In Pn/(▵P.Surf)) is used for elasticity analysis. Various standard equations have been studied and compared on the basis of this effectiveness factor. Optimum gas outlet diameter and effect of particle size on it, is presented for various design models available in literature. It is concluded that it is possible to increase the efficiency of an existing cyclone by charging the gas outlet diameter to an optimum value calculated from elasticity analysis. This will avoid any major modification in the existing cyclone to increase the collection efficiency of the cyclone. 相似文献
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Muhammad Luqman Mohd-Shafie Wan Mohd Nasir Wan Kadir Muhammad Khatibsyarbini Mohd Adham Isa Israr Ghani Husni Ruslai 《计算机、材料和连续体(英文)》2022,71(3):4337-4354
Testing is an integral part of software development. Current fast-paced system developments have rendered traditional testing techniques obsolete. Therefore, automated testing techniques are needed to adapt to such system developments speed. Model-based testing (MBT) is a technique that uses system models to generate and execute test cases automatically. It was identified that the test data generation (TDG) in many existing model-based test case generation (MB-TCG) approaches were still manual. An automatic and effective TDG can further reduce testing cost while detecting more faults. This study proposes an automated TDG approach in MB-TCG using the extended finite state machine model (EFSM). The proposed approach integrates MBT with combinatorial testing. The information available in an EFSM model and the boundary value analysis strategy are used to automate the domain input classifications which were done manually by the existing approach. The results showed that the proposed approach was able to detect 6.62 percent more faults than the conventional MB-TCG but at the same time generated 43 more tests. The proposed approach effectively detects faults, but a further treatment to the generated tests such as test case prioritization should be done to increase the effectiveness and efficiency of testing. 相似文献
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多能互补分布式综合供能具有绿色、低碳和高效等典型特征,已经成为国内外能源领域研究与发展的重点。论述了多能互补分布式综合供能系统的基本概念、主要技术特征、系统主要构成与关键技术等,并以国内某典型科技创新园为例,分析其负荷需求和资源禀赋,开发了"五化一体"综合供能实施方案。该方案以燃气分布式、分布式光伏、分布式风电、污水源热泵和储能为供能主体,构建了电力、热力、冷煤水、燃气和中水等能源网络,并借助智能化技术实现供能系统的优化运行,满足不同用能主体用能需求。最后,针对我国多能互补分布式综合供能系统发展现状与存在的问题给出相关建议。 相似文献