LNG气化站监控系统的研究与设计

发布时间：2018-06-19 08:28

本文选题：LNG气化站 + 监控系统　；参考：《西南石油大学》2014年硕士论文

【摘要】：在LNG产业中,LNG气化站是LNG供应链非常重要的环节,担任LNG存储,气化以及将天然气送入用户应用管网的任务。目前,国内外都采用SCADA系统对LNG气化站进行控制,国内大多数采用国外设备和技术,虽然这些设备可靠性较高,但普遍存在价格高和无自主知识产权的缺点,进而导致整个系统的建设和运营成本较高。因此,自主研发LNG气化站监控系统,提高系统灵活性,丰富系统监控功能,最大程度减少气化站的建设及运营成本,对我国LNG产业的发展具有很强的现实意义。在本文中,研究设计了一套LNG气化站监控系统。硬件方面,为了提高系统的安全性,现场设备均采用本安型仪表。系统控制器采用西门子S7-200系列CPU224可编程逻辑控制器采集储罐压力、储罐液位、天然气温度、管道流量、现场甲烷浓度以及接近开关状态等现场数据,经过分析处理后,对储罐进/出气阀门和循环水加热炉进行控制；软件方面,系统设计采用STEP-7编程软件对PLC控制器进行编程控制,采用WinCC组态软件开发监控软件。采用PC Access搭建PLC控制器与监控软件的数据通信,使监控软件顺利完成监控系统的工艺流程组态、实时数据显示、历史数据显示、系统报表显示以及报警参数设置等功能。监控系统在调试过程中运行稳定、可靠、响应速度快,满足LNG气化站监控的各项要求。同时,该系统成本低,且具有良好的扩展性。将系统稍加修改可使用于住宅小区燃气应用监控、安全管理以及石油化工的其他过程控制领域。
[Abstract]:LNG gasification station is a very important part of LNG supply chain in LNG industry. It serves as the task of LNG storage, gasification and the application of natural gas to users. At present, SCADA system is used to control LNG gasification station at home and abroad. Most of the domestic equipment and technology are used abroad. Although the reliability of these equipments is high, the disadvantages of high price and no independent intellectual property are generally existed. Therefore, the construction and operation cost of the whole system is high. Therefore, the independent research and development of LNG gasification station monitoring system, improve the system flexibility, enrich the system monitoring function, and minimize the construction and operation costs of the gasification station, has a strong practical significance for the development of LNG industry in China. In this paper, a set of LNG gasification station monitoring system is studied and designed. Hardware, in order to improve the safety of the system, field equipment are using the intrinsically safe instrument. The system controller uses Siemens S7-200 series CPU224 programmable logic controller to collect field data such as tank pressure, tank liquid level, natural gas temperature, pipeline flow rate, field methane concentration and close to switch state. The inlet / outlet valve of storage tank and the reheating furnace of circulating water are controlled. In software design, the PLC controller is controlled by STEP-7 programming software, and the monitoring software is developed by WinCC configuration software. The data communication between PLC controller and monitoring software is built by using PC Access, which makes the monitoring software complete the functions of process configuration, real-time data display, history data display, system report display, alarm parameter setting and so on. The monitoring system is stable, reliable and fast in response to the requirements of LNG gasification station. At the same time, the system has low cost and good expansibility. The system can be used in the residential district gas application monitoring, safety management and other petrochemical process control field.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP277

【参考文献】