共查询到17条相似文献,搜索用时 140 毫秒
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李康林 《中国石油和化工标准与质量》2012,33(10)
结合辽河油田第一套小型撬装LNG装置的建设实践,简要介绍已用于工业生产的比较成熟的小型撬装液化装置工艺方案,通过工艺方案比选确定该液化装置采用醇胺(MDEA)脱酸、分子筛脱水、氨预冷混合冷剂制冷的主要生产工艺.详细描述了该液化装置各系统的工艺流程,对今后小型LNG工厂的系列化、标准化、规范化建设有指导意义. 相似文献
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李康林 《中国石油和化工标准与质量》2012,(9):100-101,103
结合辽河油田第一套小型撬装LNG装置的建设实践,简要介绍已用于工业生产的比较成熟的小型撬装液化装置工艺方案,通过工艺方案比选确定该液化装置采用醇胺(MDEA)脱酸、分子筛脱水、氨预冷混合冷剂制冷的主要生产工艺。详细描述了该液化装置各系统的工艺流程,对今后小型LNG工厂的系列化、标准化、规范化建设有指导意义。 相似文献
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小型可移动式天然气液化装置以其独特优势在零散天然气源的液化集输、管输天然气的再分配及分布式调峰和车用LNG燃料站等场合有非常广泛的应用前景。概括对比分析了现有的天然气液化技术,指出占据国际LNG工业主流地位的混合制冷剂循环(MRC)液化流程也是适宜小型化的最佳技术之一。在简要介绍了小型天然气液化装置的近期进展后,重点介绍了本团队基于近20年的混合工质节流制冷技术方面的研究经验,研制成功系列规格小型混合工质撬装液化装置,同时提出并创建了以此为基础的"煤层气柔性液化中心和虚拟管网"集输方案的概念。已研制出的全风冷、制冷油润滑螺杆压缩机驱动的10000~30000 m3·d-1"可移动式液化装置",其中30000 m3·d-1液化装置生产中实测液化比功耗已经与国内1000000 m3·d-1的集中液化工厂相当。目前在山西、内蒙古已有多套不同规模的装置运行,初步形成一定规模。 相似文献
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混合制冷剂制冷循环可以提高制冷系统的效率,广泛应用在天然气液化领域。混合制冷剂的循环级数对制冷性能影响很大。针对不同级数的混合制冷剂循环进行热力学分析,建立了流程中主要设备的热力学模型,模拟计算了采用不同级数的混合制冷剂循环的天然气液化流程,得到不同级数的制冷循环的主要参数:制冷压缩机的功耗、制冷系数和火用效率。结果表明,制冷循环的级数增加,制冷系统的功耗降低,制冷系数和火用效率增加,但是级数增加对制冷性能的影响减小。制冷循环的级数增加会增加流程的复杂性,降低可操作性,不同规模的制冷系统的最优级数不同,规模越大,最优级数就越多。 相似文献
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以西北某城市液化天然气工程为例,介绍了中小型液化天然气装置预处理和液化的工艺流程,以及液化天然气大储罐布置的注意事项。根据实际的气源条件,考虑到减少投资、增大效率的前提,推荐采用分子筛脱水+单循环混合冷剂制冷工艺。 相似文献
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C3/MRC液化流程中原料气成分及制冷剂组分匹配 总被引:1,自引:0,他引:1
针对两种代表性原料天然气No.1和No.2,利用Aspen HYSYS流程模拟软件对C3/MRC天然气液化流程进行了动态模拟,考虑了混合制冷剂高低压变化、混合制冷剂组分改变,通过模拟研究获得了混合制冷剂各个组分N2、CH4、C2H6及C3H8在制冷系统中的不同作用,同时获得了制冷剂组分与混合制冷剂高低压以及原料天然气cp-T之间的依赖关系,全面动态地展示了制冷剂各组分在C3/MRC流程中的影响和作用。在此基础上,又对比了原料天然气No.1和No.2在不同混合制冷剂高低压下C3/MRC流程的能耗指标。研究结果表明:原料天然气的cp-T关系是决定整个C3/MRC流程能耗高低的关键因素,而混合制冷剂的组分或高低压的选择则对系统能耗影响较弱。混合制冷剂的组成及其高低压力的选择应根据原料天然气的cp-T关系进行合理选取,以确保流程设计更为合理。 相似文献
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Liquefied natural gas (LNG) is attracting significant interest as a clean energy alternative to other fossil fuels, mainly for its ease of transport and low carbon dioxide emission. As worldwide demand for LNG consumption has increased, liquefied natural gas floating, production, storage, and offloading (LNG-FPSO) operations have been studied for offshore applications. In particular, the LNG-FPSO topside process systems are located in limited areas. Therefore, the process plant layout of the LNG-FPSO topside systems will be optimized to reduce the area cost occupied by the topside equipment, and this process plant layout will be designed as a multifloor concept. We describe an optimal layout for a generic offshore LNG liquefaction process operated by the dual mixed refrigerant (DMR) cycle. To optimize the multifloor layout for the DMR liquefaction cycle process, an optimization was performed by dividing it into first and the second cycles. A mathematical model of the multifloor layout problem based on these two cycles was formulated, and an optimal multifloor layout was determined by mixed integer linear programming. The mathematical model of the first cycle consists of 725 continuous variables, 198 equality constraints, and 1,107 inequality constraints. The mathematical model of the second cycle consists of 1,291 continuous variables, 286 equality constraints, and 2,327 inequality constraints. The minimization of the total layout cost was defined as an objective function. The proposed model was applied to DMR liquefaction cycle process to determine the optimal multifloor layout. 相似文献
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LNG技术是一种将天然气以液态的形式储存技术,便于管道装置的储存以及运输工作。以某地区液化天然气工程为例,首先是对原料气组分进行分析,根据原料气成分与各项成分含量标准要求进行选择合适的脱除工艺,选取MDEA剂脱除酸性气体和分子筛脱水等净化工艺。在液化工艺方面,主要分析了阶式制冷液化工艺与复迭式制冷液化工艺,从能耗、投资、回收期、税前内部收益率、设备数量、处理复杂程度、操作方面以及技术成熟度方面对比,优选出复叠式制冷液化工艺,该液化工艺在达到理想液化率97.3%的情况下,综合指标优于阶式制冷液化工艺,而且目前该技术使用比较成熟,设备数量少,占地面积小,是一种操作简单、处理高效的液化工艺,建议采用MDEA剂脱除酸性气体+分子筛脱水+复迭式制冷液化工艺。 相似文献
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天然气的预处理和液化是海上天然气利用前的两个关键环节。选取变压吸附分离法(PSA)作为浮式LNG预处理流程的工艺方法,选择新型CO2预冷空气膨胀液化流程作为浮式LNG天然气液化的工艺方法,并对以上预处理和液化流程进行了模拟计算与分析。结果表明,采用双层吸附剂变压吸附(PSA)预处理流程能耗低,全气体运行避免了液体吸收剂随波浪晃动的缺点,可以满足海上天然气预处理的要求;CO2预冷空气膨胀液化流程在预冷剂及制冷剂循环过程中,没有液体的产生,安全性高;以上预处理和液化流程适应于海上晃动的LNG平台。 相似文献
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Wonsub Lim Inkyu Lee Kwanghee Lee Byeonggil Lyu Junghwan Kim Il Moon 《Korean Journal of Chemical Engineering》2014,31(9):1522-1531
Multi-stage expander refrigeration cycles were proposed and analyzed in order to develop an efficient natural gas liquefaction process. The proposed dual and cascade expander processes have high efficiency and the potential for larger liquefaction capacity and are suitable for small-scale and offshore natural gas liquefaction systems. While refrigeration cycles of conventional expander processes use pure nitrogen or methane as a refrigerant, the proposed refrigeration cycles use one or more mixtures as refrigerants. Since mixed refrigerants are used, the efficiency of the proposed multi-stage expander processes becomes higher than that of conventional expander processes. However, the proposed liquefaction processes are different from the single mixed refrigerant (SMR) and dual mixed refrigerant (DMR) processes. The proposed processes use mixed refrigerants as a form of gas, while the SMR and DMR processes use mixed refrigerants as a form of gas, liquid- or two-phase flow. Thus, expanders can be employed instead of Joule-Thomson (J-T) valves for refrigerant expansion. Expanders generate useful work, which is supplied to the compressor, while the high-pressure refrigerant is expanded in expanders to reduce its temperature. Various expander refrigeration cycles are presented to confirm their feasibility and estimate the performance of the proposed process. The specific work, composite curves and exergy analysis data are investigated to evaluate the performance of the proposed processes. A lower specific work was achieved to 1,590 kJ/kg in the dual expander process, and 1,460 kJ/kg in the cascade expander process. In addition, the results of exergy analysis revealed that cycle compressors with associated after-coolers and companders are main contributors to total exergy losses in proposed expander processes. 相似文献