共查询到20条相似文献,搜索用时 125 毫秒
1.
2.
3.
4.
分散型控制系统接地分析 总被引:4,自引:1,他引:3
运用有关电气专业理论,结合工程实际分析了干扰的产生及其危害,对分散型控制系统两种不同的接地方式的区别作了详细分析,对在系统接地装置过程中出现的技术问题提出了相应处理措施并对注意事项予以说明。 相似文献
5.
6.
7.
浅谈分散型控制系统的可靠性 总被引:3,自引:2,他引:1
可靠性是分散型控制系统最重要的技术性能指标之一。从分散型控制系统的硬件与软件两个方面入手,详细介绍可靠性及可靠性指标,并围绕系统的组成特点阐述分散型控制系统可靠性设计要求和设计准则,以及可靠性分配方法和可靠性设计方法。 相似文献
8.
9.
10.
11.
在催化裂化装置上采用了西门子T-M集散控制系统对生产过程进行的硬件配置和软件组态,用两套OS通讯监视了系统对3套AS自控子系统进行监视操作控制,既节约投资,提高可靠性,又合理利用了计算机资源,成功实现了炼油装置的集中监控。 相似文献
12.
介绍了DS-9500分散控制系统的软硬件构成,详细地阐述了DS-9500系统在洛阳石化公司炼油实验厂催化裂化装置(FCCU)上的应用,文中着重针对反应温度与再生滑阀压降低选控制方案,从控制流程,仪表回路,硬件结构,系统组态,系统生成及系统测试等几个方面阐述了控制方案的具体实施过程。 相似文献
13.
14.
鄂尔多斯盆地东缘煤层气勘探开发有20余年历史,近年来在保德、柳林等区块规模化开发迅速发展,但总体上全区产业化发展并不均衡。除工程因素外,对煤层气地质条件的认识仍然存在分歧,煤层气成藏地质模型可以为勘探选区提供借鉴。通过对鄂尔多斯盆地东缘构造格架、地层层序、水动力条件及气体成因的研究,构建了研究区北段单斜式低煤级煤层气成藏地质模型、中段基底上拱式中煤级煤层气成藏地质模型、南段边缘推覆式高煤级煤层气成藏地质模型,典型代表区域分别在府谷、吴堡—柳林和韩城。其中,单斜式低煤级煤层气成藏地质模型中,煤层气相对富集于地下水滞留区上部;在基底上拱式中煤级煤层气成藏地质模型中,煤层气高渗富集区位于拉张型鼻状隆起带;在边缘推覆式高煤级煤层气成藏地质模型中,气体富集于挤压型构造转折端。研究结果表明:吴堡—柳林基底上拱式中煤级煤层气成藏地质模型各成藏要素匹配良好,气体储集和渗流条件最好,建议作为优先开发区域;府谷单斜式低煤级的含气性相对差,渗透率高;韩城地区尽管气体保存条件好,但边浅部受边缘逆冲推覆构造的影响,煤体结构破坏严重,煤层气可采性差。 相似文献
15.
西藏伦坡拉盆地成藏动力学系统分析 总被引:3,自引:0,他引:3
西藏伦坡拉盆地烃源岩经历了三期生油过程,发生了三期克注成藏作用。油气运移沿断层、不整合、孔隙或裂 隙连络体系进行,运移驱动力在牛堡组沉积期为异常高压,而丁青湖组沉积期则为静水压力。成藏动力学系统可分为下 部自源封闭、中部它源一自源半封闭一封闭及顶部它源开放一半封闭三种类型。在帕格拉挠曲带、爬错凹陷南斜坡、蒋日阿 错南斜坡及罗玛迪库区带以寻找自源封闭成藏动力学系统的油气藏为主;而在北部的红星梁-低鄂总、罗玛迪库以中部 它源-自源半封闭-封闭的成藏动力学系统的油气藏为主,同时兼顾顶部它源开放-半封闭成藏动力学系统的油气藏勘探。 相似文献
16.
分析两类基于模型计算的控制系统,系统分析和实践表明,基于模型计算测量值的控制系统将计算环节引入反馈回路,会造成系统开环总增益的变化,因此,影响系统稳定性,增大偏离度,使控制系统品质恶化,为此应将计算环节引入到设定通道。基于模型计算设定值的控制系统没有稳定性问题。还讨论了它们在工程设计和实施时的注意事项。 相似文献
17.
在天然气处理领域中,紧急停车-集散控制系统(ESD/DCS)是一种安全、可靠、先进的生产管理与控制技术。土库曼斯坦阿姆河右岸"巴格德雷合同区"主力气田——萨曼杰佩气田为高含硫高产凝析油气田,年产天然气50×108 m3~60×108 m3。针对该气田原料气组分复杂、生产装置众多、工艺齐全、处理量大等特点,第一天然气处理厂天然气净化工艺控制过程采用集散控制系统(DCS-Distributed Control System)和紧急停车系统(ESD-Emergency Shutdown Device),实现了天然气净化装置的安全、可靠生产,符合节能及环保设计要求,其设计思路与工艺控制过程具有先进性。 相似文献
18.
19.
The performance of a solution gas-drive reservoir can be predicted using Vogel inflow performance relation (or IPR), which simply relates the deliverability of a well to bottom-hole pressure and average reservoir pressure. While many studies have shown the success of Vogel-type IPR for single porosity reservoirs, the applicability of this method for naturally fractured reservoirs (NFRs), is under question mainly because of the complex flow behavior in matrix and fracture systems. The present study is undertaken to determine if the relation between NFR flowing wellbore pressure and oil production rate could be described by Vogel's IPR. For this purpose, a synthetic dual porosity fractured reservoir with typical rock and fluid properties is considered as a base-case. Identifying important parameters affecting the performance of a naturally fracture reservoir, a total of 22 simulations covering a wide range of reservoir fluid properties, fracture permeabilities, capillary pressure, block height, and recovery factor are made. The results show significant errors between simulation output and Vogel's IPR. A modification is made on Vogel's IPR to use it for performance prediction of dual porosity model. 相似文献
20.
N. Fatourehchi M. Sohrabi S. J. Royaee S. M. Mirarefin 《Petroleum Science and Technology》2013,31(15):1578-1589
Abstract Light olefins are basic raw materials for petrochemical industries and the global demand for the latter is growing. The authors investigated the conversion of methanol to light olefins in presence of acidic SAPO-34 molecular sieve as the reaction catalyst. SAPO-34 was synthesized by hydrothermal method, applying morpholine as the template. The molecular sieve was then changed into protonated form by ion exchange process with ammonium chloride at 80°C. A kinetic study was carried out within the temperature range of 375–425°C and 4 bar pressure using a differential fixed bed reactor. An appropriate kinetic model was presented and the kinetic parameters were evaluated as functions of temperature. In addition, the formation of light olefins was implemented in a fluidized bed reactor under a wide range of operating conditions. The experimental results were correlated with those predicted from a hydrodynamic model. Taguchi's experimental design method was applied to determine the optimum operating parameters of this process conducted in the fluidized bed reactor. The optimized parameters were the following: temperature = 425°C; ratio of inlet gas velocity to minimum fluidizing velocity (U0/Umf) = 7; catalyst mean particle size = 240 μm. 相似文献