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排序方式: 共有137条查询结果,搜索用时 15 毫秒
61.
利用井口自动化装置进行石油钻井过程中溢流、井喷时的关井作业是目前井控作业的热点。为了有效减少工作人员操作时间,保证装置的可靠性。提出了1种自动抢接止回阀装置,并将装置的控制系统设计成全液压系统。基于AMEsim对设计的液压系统进行建模以及模拟仿真分析,得到了执行元件(3个液压马达和1个伸缩液压缸)的输出特性曲线,然后与理论计算、设计及选型的执行元件的参数进行对比。研究结果表明:设计的液压回路可以确保自动抢接止回阀装置的整个工作过程正常、稳定的进行。设计的自动抢接止回阀装置的性能基本满足使用要求,具有一定的实用价值。 相似文献
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Jacek Krzyżanowski Katarzyna Majchrzycka 《International journal of occupational safety and ergonomics》2013,19(3-4):191-202
The article shows the problem of clogging in connection with the parameters of filtering materials used in respiratory protective equipment. The results of investigations of airflow resistance changes during the depositing of dust inside the filtering material are presented. The configuration of layers differing in mass per unit area and the number of layers, were taken into consideration. For each configuration, the clogging abilities and the changes of airflow resistance as a reason of loading with dust were assessed. The analysis of tested materials confirms the hypothesis that there is an important coincidence between the properties of the material used in filtering equipment and the clogging coefficient. The results show that the filter should have a layered structure and that the outer layer should be made of a nonwoven of relatively high surface density. 相似文献
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Sławomir Zakrzewski Katarzyna Majchrzycka Agnieszka Brochocka Krzysztof Makowski 《International journal of occupational safety and ergonomics》2013,19(2):164-170
In most industrial enterprises, hazardous factors are present in quantities exceeding permissible levels. Such a situation requires using antidust respiratory protection. It has been suggested, however, that filters for respirators are not assessed properly and that lab results might not be related to real filtering efficiency in industry. This article contains test results of some commercially available filtering half-masks, including the effect of loading with real dust, high humidity, high temperature, and a combination of loading with dust and high humidity on the half-masks’ performance. The results show that the effect of these factors is considerable and that a combination of loading with silica dust and exposing to high humidity can cause a complete loss of performance. 相似文献
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针对催化裂化装置待生滑阀突然关闭导致装置停车事故,通过对仪表及系统处理过程进行原因分析,总结了事故的经验教训及防范措施,指出了炼化企业大型设备不但要正确使用,更要精心维护保养,才能确保装置正常平稳运行防患于未然。 相似文献
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华电新乡宝山电厂660MW机组配套电-袋复合除尘器是国内成功投运的大型电-袋复合除尘器。该机组原配套2台双室四电场电除尘器,由于各种原因导致投运后排放一直超标。2009年4月改造为电-袋复合除尘器,取得良好效果。 相似文献
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Georg Grüll 《Journal of Environmental Economics and Management》2011,61(1):107-118
This paper examines the key design mechanisms of existing and proposed cap-and-trade markets. First, it is shown that the hybrid systems under investigation (price floor using a minimum price guarantee, price collar, allowance reserve, options offered by the regulator, and offset relaxation) can be decomposed into a combination of an ordinary cap-and-trade scheme with European- or American-style call and put options. Then, we quantify and discuss the advantages and disadvantages of the proposed hybrid schemes by investigating whether pre-set objectives (enforcement of permit price bounds and reduction of the compliance costs for relevant companies) can be accomplished while maintaining the original environmental targets. Plain vanilla options are proposed as an alternative that reconciles the otherwise conflicting policy objectives. 相似文献
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