基于PLC的M-LNG撬装站站控系统的研究与开发
发布时间：2018-12-17 04:56
【摘要】：我国天然气资源分布非常广泛,呈现西多东少的分布趋势,且大多数是小型离散气田,地处偏远地带,单井产气量低,导致可开采的天然气资源得不到充分的利用。近些年,为了充分利用这部分资源,具有灵活移动、拆装方便、体积小、建厂周期短等优势的小型可移动式LNG撬装装置备受瞩目。因此,本课题运用自动化控制技术,结合天然气的物理、化学性质和天然气生产的专业知识,对这一装置及其关键实现技术进行了较深入的研究,并以SIEMENS S7-200 Smart PLC为核心,开发了相应的站控系统,主要内容如下：首先,在分析了国内外天然气液化装置的设计及液化流程的基础上,完成小型可移动式LNG撬装站的工艺流程设计,并根据天然气液化的工艺流程与生产信息,以及LNG撬装站对站控系统的需求,提出小型M-LNG撬装站站控系统的体系架构。在此结构上,规划站控系统的硬件结构,完成现场设备单元的各类仪表选型,过程控制单元的主要硬件选型和硬件接线设计,监控管理单元的软件设计方案。其次,针对气田工作环境恶劣,且撬装站生产信息数据量大的特点,提出了基于以太网的数据交换方案,该方案采取了两套通信线路,一套是采用TCP/IP协议,通过以太网接口来完成上位机与PL、PLC与PLC之间、PLC与下位机之间的通信,另一套是使用无线路由器,实现控制系统与监控系统之间的实时数据交换。最后,根据站控系统的控制要求,完成PLC控制单元的软件编写,并通过MATLAB仿真软件对PID控制进行仿真,完成基于组态王的上位机以及基于Smart 700IE的下位机的监控画面的创建,完成基于Modbus RTU主从站协议通信的通信协议编写,实现小型LNG撬装站站控系统的开发,并通过试验应用,证实了系统的适用性。
[Abstract]:The distribution of natural gas resources in China is very extensive, showing a tendency of distribution in the west, more in the east and less in the east, and most of them are small discrete gas fields, which are located in remote areas and have low gas production per well, which leads to the insufficient utilization of the recoverable natural gas resources. In recent years, in order to make full use of this part of resources, small portable LNG prying devices with advantages of flexible movement, convenient disassembly and assembly, small size and short construction period have attracted much attention. Therefore, with the application of automatic control technology, combined with the physical and chemical properties of natural gas and the specialized knowledge of natural gas production, this paper makes a deep research on this device and its key technologies, and takes SIEMENS S7-200 Smart PLC as the core. The corresponding station control system is developed. The main contents are as follows: firstly, on the basis of analyzing the design and liquefaction process of domestic and foreign natural gas liquefaction equipment, the process design of small portable LNG prying station is completed. According to the process flow and production information of natural gas liquefaction, as well as the demand of LNG prying station for station control system, the system architecture of small M-LNG prying station control system is put forward. In this structure, we plan the hardware structure of the station control system, complete all kinds of instrument selection of the field equipment unit, the main hardware selection and the hardware wiring design of the process control unit, and the software design scheme of the monitoring management unit. Secondly, in view of the bad working environment in the gas field and the large amount of production information in the prying station, a data exchange scheme based on Ethernet is put forward, which adopts two sets of communication circuits, one of which is based on TCP/IP protocol. The communication between host computer and PL,PLC and between PLC and lower computer is accomplished through Ethernet interface. Another set is to use wireless router to realize real-time data exchange between control system and monitoring system. Finally, according to the control requirements of the station control system, the software of the PLC control unit is written, and the PID control is simulated by the MATLAB simulation software. The upper computer based on Kingview and the monitoring screen of the lower computer based on Smart 700IE are created. The communication protocol based on Modbus RTU master-slave protocol communication is completed, and the development of small LNG prying station control system is realized. The applicability of the system is proved through the experiment and application.
【学位授予单位】：宁夏大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE978;TP273
本文编号：2383688
[Abstract]:The distribution of natural gas resources in China is very extensive, showing a tendency of distribution in the west, more in the east and less in the east, and most of them are small discrete gas fields, which are located in remote areas and have low gas production per well, which leads to the insufficient utilization of the recoverable natural gas resources. In recent years, in order to make full use of this part of resources, small portable LNG prying devices with advantages of flexible movement, convenient disassembly and assembly, small size and short construction period have attracted much attention. Therefore, with the application of automatic control technology, combined with the physical and chemical properties of natural gas and the specialized knowledge of natural gas production, this paper makes a deep research on this device and its key technologies, and takes SIEMENS S7-200 Smart PLC as the core. The corresponding station control system is developed. The main contents are as follows: firstly, on the basis of analyzing the design and liquefaction process of domestic and foreign natural gas liquefaction equipment, the process design of small portable LNG prying station is completed. According to the process flow and production information of natural gas liquefaction, as well as the demand of LNG prying station for station control system, the system architecture of small M-LNG prying station control system is put forward. In this structure, we plan the hardware structure of the station control system, complete all kinds of instrument selection of the field equipment unit, the main hardware selection and the hardware wiring design of the process control unit, and the software design scheme of the monitoring management unit. Secondly, in view of the bad working environment in the gas field and the large amount of production information in the prying station, a data exchange scheme based on Ethernet is put forward, which adopts two sets of communication circuits, one of which is based on TCP/IP protocol. The communication between host computer and PL,PLC and between PLC and lower computer is accomplished through Ethernet interface. Another set is to use wireless router to realize real-time data exchange between control system and monitoring system. Finally, according to the control requirements of the station control system, the software of the PLC control unit is written, and the PID control is simulated by the MATLAB simulation software. The upper computer based on Kingview and the monitoring screen of the lower computer based on Smart 700IE are created. The communication protocol based on Modbus RTU master-slave protocol communication is completed, and the development of small LNG prying station control system is realized. The applicability of the system is proved through the experiment and application.
【学位授予单位】：宁夏大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE978;TP273
【引证文献】
相关会议论文 前1条
1 陈莉;;PLC在油田撬装式设备中的应用[A];山东省石油学会油田电力、通信及自动化技术研讨会优秀工程技术论文集[C];2009年
，本文编号：2383688
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