青岛LNG接收站BOG工艺处理技术及优化方案

发布时间：2018-07-24 13:05

【摘要】：LNG即为液化天然气因其体积小易于运输与储存在现阶段全球能源消费中被公认为最清洁的理想能源之一。青岛LNG接收站位于山东省青岛市西海岸经济技术开发区的董家口港,是中国“十一五”重点规划项目,也是中国石化第一座LNG接收站。青岛LNG接收站根据市场需求分两期建设,已于2014年11月投产建设了规模为每年300×10~4t的一期工程,供气能力达到每年40.5×10~8m~3。目前已规划并开展建设规模为每年500×10~4m~3,供气能力达每年67×10~8m~3的二期建设,远期建设规模达到每年1000×10~4t,供气能力达每年135x10~8m~3。接收站一期工程包括3台16×10~4m~3LNG储罐工程、配套的LNG站场工艺工程,包括LNG接卸、气化、增压、输送、计量等系统,同时现已投入生产的年处理200×10~4t的LNG富液的轻烃回收系统、利用LNG冷能日产600t(液氧、液氮、液氩)的空气分离系统以及LNG场站内外的公用工程系统。本文以BOG工艺处理进行了详细的介绍,确定以青岛LNG接收站BOG的工艺处理作为本次的研究对象。利用体积平衡法及HYSYS作为计算及模拟工具对现有的BOG处理工艺进行了研究分析,并根据青岛LNG接收站实际运营情况制定了BOG优化方案。首先,通过对国内外LNG接收站BOG工艺处理方式的研究现状进行了调研并分析,从能耗及工艺两方面出发对常见的BOG直接压缩工艺及BOG再冷凝工艺进行了分析对比。其次,本文通过应用体积平衡方法模拟在卸船和非卸船工况下各项设备的工艺参数计算得出了青岛LNG接收站产生的BOG的总量。再者本文从热力学角度出发,通过自接收站投产到2016年8月底的各项生产数据及BOG处理量等工艺参数对泵和压缩机的功耗以及对流程性能参数的影响,进行了对现阶段青岛LNG接收站BOG工艺处理的适应性分析,并总结得出现阶段BOG工艺处理方式存在的问题以及提出从合理配置设备和调整工艺参数两方面出发的BOG优化方法。最后,针对青岛LNG接收站存在的靠船审批和下游市场等综合因素对BOG工艺处理的影响,从工艺流程、结构设计、电气电信改造等几方面出发制定了青岛LNG接收站的BOG处理优化方案,并从经济的角度进行了方案的可行性研究,按保守估计现阶段的处理工艺因造成大量放空,经济损失达3770万元且将造成大气污染,本文设计的BOG工艺处理优化方案建成投产后每年能节省生产成本约1542万元从而使得接收站的各项装置能够平稳、经济地运行。
[Abstract]:LNG is one of the cleanest ideal energy sources in the global energy consumption due to its small size and easy transportation and storage. Qingdao LNG receiving Station is located in Dongjiakou Port of the Economic and technological Development Zone on the west coast of Qingdao City, Shandong Province. It is a key project of China's 11th Five-Year Plan and the first LNG receiving station of Sinopec. Qingdao LNG receiving station has been built in two phases according to market demand, and has been put into production in November 2014. The first stage project with a scale of 300 脳 10 ~ (4) t per year has been put into production, and the gas supply capacity has reached 40.5 脳 10 ~ (10) ~ 8 m ~ (-1) / a. At present, the construction scale is 500 脳 10 ~ (4) m ~ (3) per year, the gas supply capacity is 67 脳 10~8m~3 per year, the long-term construction scale is 1000 脳 10 ~ (4) t and the annual gas supply capacity is 135 脳 10 ~ (8) m ~ (3). The first stage project of the receiving station includes three 16 脳 10~4m~3LNG storage tanks, and a complete set of LNG station process engineering, including LNG unloading, gasification, pressurization, transportation, metering and so on. At the same time, the light hydrocarbon recovery system with rich liquid of LNG, which is now in production, has been put into production at the same time. The air separation system with the daily output of 600t (liquid oxygen, liquid nitrogen, liquid argon) and the public engineering system inside and outside the LNG station are used in LNG cold energy production. In this paper, the BOG process is introduced in detail, and the process of Qingdao LNG receiving station BOG is selected as the object of this study. The existing BOG treatment process is studied and analyzed by volume balance method and HYSYS as a calculation and simulation tool, and the BOG optimization scheme is established according to the actual operation of Qingdao LNG receiving station. Firstly, the research status of BOG process at LNG receiving station at home and abroad is investigated and analyzed, and the common BOG direct compression process and BOG recondensation process are analyzed and compared from the aspects of energy consumption and process. Secondly, the total amount of BOG produced by Qingdao LNG receiving station is calculated by using volume balance method to simulate the process parameters of each equipment under unloading and non-unloading conditions. Thirdly, from the thermodynamic point of view, through the production data from the receiving station to the end of August 2016, and the effect of the process parameters such as BOG processing capacity on the power consumption of the pump and compressor, and on the process performance parameters, The adaptability analysis of BOG process treatment at Qingdao LNG receiving station at present is carried out, and the problems existing in the current BOG process treatment mode are summarized, and the BOG optimization method is put forward from two aspects: reasonable configuration of equipment and adjustment of process parameters. Finally, in view of the influence of the comprehensive factors such as the ship docking examination and approval and the downstream market of Qingdao LNG receiving station on the BOG process processing, from the point of view of the process flow and structure design, The optimization scheme of BOG processing for Qingdao LNG receiving station has been formulated from several aspects, such as electrical telecommunication transformation, and the feasibility study of the scheme has been carried out from an economic point of view. According to the conservative estimate, the current treatment process has caused a large amount of emptying. The economic loss is up to 37.7 million yuan and will cause air pollution. The BOG process optimization scheme designed in this paper can save about 15.42 million yuan of production cost every year after it is put into operation, so that the equipment of the receiving station can run smoothly and economically.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TE83

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