LNG轻烃回收技术研究及其过程分析
发布时间：2018-08-01 18:15
【摘要】：环境与能源问题日益成为制约我国经济可持续发展的一个重要瓶颈,为了优化我国能源结构,改善我国居民居住环境,提高国民经济收入,我国开始大力发展液化天然气。由于LNG中含有约10%的C2+轻烃,其乙烷、丙烷、丁烷等轻烃原料是生产乙烯的优质材料;同时,LNG在气化时会释放出大量的冷能,据估算每千克LNG的冷量?为830KJ—850KJ,因此,充分高效的利用LNG冷能回收其自身的C2+轻烃,不仅有利于节约能源,还能够创造巨大的经济效益。论文主要从以下几方面进行论述:首先,本文详细介绍了LNG轻烃回收技术原理及分类,同时概述了国内外经典LNG轻烃回收流程,针对山东LNG轻烃装置的工艺流程、工艺设备、产品性质做了详细的叙述。通过对比分析得到现有流程所存在的问题并提出了解决方案。其次,针对液化天然气冷能特性进行了较为简要的阐述,同时,提出了适用于LNG轻烃回收技术的评价方法,即采用?分析法评价冷能利用工艺的能量利用率;采用技术经济分析法评价LNG轻烃回收冷能利用工艺的经济指标,同时指出启动该工艺装置的边界条件。通过上述两种分析,对LNG轻烃回收工艺进行综合评价。进而,针对LNG气化过程复杂性建立了LNG气液相平衡模型,采用BWRS状态方程建立了LNG物性参数模型,利用Visual Basic 6.0开发了LNG物性参数计算软件。通过计算实例验证本文计算软件精度均满足精度要求,为LNG轻烃回收技术的开发及应用提供了利用工具,便于轻烃回收过程分析。最后,针对国内外LNG轻烃回收流程进行较为详细的工艺研究及理论分析,通过本文所编制的软件为工具,以?分析及经济评价为手段,计算得到各个工艺能量评价指标、经济评价指标及产品浓度指标,通过对比分析得到了现有LNG轻烃回收流程存在的问题,针对此类问题以冷量梯级利用原则开发了新型LNG轻烃回收流程,建立了该项工艺的?分析模型及经济评价模型,分析了该流程的冷量利用率,乙烷回收率等多处产品指标及风险系数。其系统?效率为87.49%,产品中甲烷摩尔含量为99.01%,C2+轻烃回收率为94.65%,与其它流程相比其年盈利值、产品浓度、回收率、系统能耗及风险系数均为最优。
[Abstract]:The problem of environment and energy has become an important bottleneck restricting the sustainable development of China's economy. In order to optimize the energy structure of our country, improve the living environment of our residents and improve the income of the national economy, China has begun to develop liquefied natural gas vigorously. Since the LNG contains about 10% of C2+ light hydrocarbons, the light hydrocarbon materials of ethane, propane and butane are produced. At the same time, LNG will release a lot of cold energy in gasification. It is estimated that the cooling amount of LNG per kilogram is 830KJ 850KJ. Therefore, the full and efficient use of LNG cold energy to recover its own C2+ light hydrocarbon is not only beneficial to energy saving, but also can create great economic benefits. The thesis is mainly discussed in the following aspects: first In this paper, the principle and classification of LNG light hydrocarbon recovery technology are introduced in detail. At the same time, the classic LNG light hydrocarbon recovery process at home and abroad is summarized. The technological process, process equipment and product properties of Shandong light hydrocarbon unit are described in detail. The problems existing in the existing process are obtained by comparison and analysis and the solutions are put forward. Secondly, liquefaction is aimed at liquefaction. The characteristics of natural gas cold energy are briefly expounded. At the same time, the evaluation method for LNG light hydrocarbon recovery technology is put forward, that is, using the analysis method to evaluate the energy utilization rate of the cold energy utilization process, and the economic index of the technical and economic analysis method to evaluate the recovery of the cold energy utilization technology of the LNG light hydrocarbon, and point out the edge of the process to start the process. Boundary conditions. Through the above two analysis, the LNG light hydrocarbon recovery process is evaluated comprehensively. Then, the LNG gas-liquid phase equilibrium model is established for the complexity of LNG gasification process. The LNG physical parameter model is established by using the BWRS state equation, and the calculation software of the physical parameter of LNG is developed with Visual Basic 6. The calculation example is used to verify the calculation of this paper. The precision of the software meets the precision requirements and provides a tool for the development and application of LNG light hydrocarbon recovery technology. It is convenient for the analysis of the process of light hydrocarbon recovery. Finally, the detailed process research and theoretical analysis are carried out for the LNG light hydrocarbon recovery process at home and abroad, and the software as a tool, analysis and economic evaluation as a means, is used as a means. The problems of the existing LNG light hydrocarbon recovery process are obtained by comparison and analysis. The new LNG light hydrocarbon recovery process is developed for this kind of problem, and the analysis model and economic evaluation model of this process are established. The efficiency of the system is 87.49%, the content of methane in the product is 99.01%, the recovery rate of C2+ light hydrocarbon is 94.65%, and the annual profit value of the product, the product concentration, the recovery rate, the system energy consumption and the risk coefficient are all best compared with other processes.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE646
[Abstract]:The problem of environment and energy has become an important bottleneck restricting the sustainable development of China's economy. In order to optimize the energy structure of our country, improve the living environment of our residents and improve the income of the national economy, China has begun to develop liquefied natural gas vigorously. Since the LNG contains about 10% of C2+ light hydrocarbons, the light hydrocarbon materials of ethane, propane and butane are produced. At the same time, LNG will release a lot of cold energy in gasification. It is estimated that the cooling amount of LNG per kilogram is 830KJ 850KJ. Therefore, the full and efficient use of LNG cold energy to recover its own C2+ light hydrocarbon is not only beneficial to energy saving, but also can create great economic benefits. The thesis is mainly discussed in the following aspects: first In this paper, the principle and classification of LNG light hydrocarbon recovery technology are introduced in detail. At the same time, the classic LNG light hydrocarbon recovery process at home and abroad is summarized. The technological process, process equipment and product properties of Shandong light hydrocarbon unit are described in detail. The problems existing in the existing process are obtained by comparison and analysis and the solutions are put forward. Secondly, liquefaction is aimed at liquefaction. The characteristics of natural gas cold energy are briefly expounded. At the same time, the evaluation method for LNG light hydrocarbon recovery technology is put forward, that is, using the analysis method to evaluate the energy utilization rate of the cold energy utilization process, and the economic index of the technical and economic analysis method to evaluate the recovery of the cold energy utilization technology of the LNG light hydrocarbon, and point out the edge of the process to start the process. Boundary conditions. Through the above two analysis, the LNG light hydrocarbon recovery process is evaluated comprehensively. Then, the LNG gas-liquid phase equilibrium model is established for the complexity of LNG gasification process. The LNG physical parameter model is established by using the BWRS state equation, and the calculation software of the physical parameter of LNG is developed with Visual Basic 6. The calculation example is used to verify the calculation of this paper. The precision of the software meets the precision requirements and provides a tool for the development and application of LNG light hydrocarbon recovery technology. It is convenient for the analysis of the process of light hydrocarbon recovery. Finally, the detailed process research and theoretical analysis are carried out for the LNG light hydrocarbon recovery process at home and abroad, and the software as a tool, analysis and economic evaluation as a means, is used as a means. The problems of the existing LNG light hydrocarbon recovery process are obtained by comparison and analysis. The new LNG light hydrocarbon recovery process is developed for this kind of problem, and the analysis model and economic evaluation model of this process are established. The efficiency of the system is 87.49%, the content of methane in the product is 99.01%, the recovery rate of C2+ light hydrocarbon is 94.65%, and the annual profit value of the product, the product concentration, the recovery rate, the system energy consumption and the risk coefficient are all best compared with other processes.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE646
【参考文献】
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