共查询到17条相似文献,搜索用时 359 毫秒
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论述了丙烷预冷混合制冷剂二次分离天然气液化流程工艺参数的计算,探讨了求解循环量最小的制冷剂配比、混合制冷剂压缩机最佳出口压力和天然气压缩机最佳出口压力。 相似文献
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结合小型橇装天然气液化装置的建设实践,通过方案比选采用醇胺(MDEA)脱酸、分子筛脱水、氨预冷混合制冷剂制冷的生产工艺。阐述了该橇装液化装置的工艺流程及各橇块的组成。 相似文献
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《煤气与热力》2016,(2)
介绍国内LNG接收站现状,针对LNG接收站调试、运行的不同阶段提出BOG回收利用方法。在LNG接收站调试初期,建议采用橇装再液化装置回收BOG。根据国内某LNG接收站调试期间BOG的产生量,通过HYSYS软件模拟计算,对适用于BOG再液化装置的氮膨胀制冷循环工艺和单混合制冷剂制冷循环工艺进行能耗对比分析,从造价、成橇、运行操作和能耗等方面分析两种BOG再液化工艺的优缺点,提出两种工艺的适用条件:若BOG规模小于等于3t/h,且LNG接收站调试时间较短,建议选择氮膨胀制冷循环工艺;若BOG规模大于3t/h,且LNG接收站调试时间较长,则可以采用单混合制冷剂制冷循环工艺。 相似文献
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自然复叠制冷系统采用非共沸混合制冷剂,利用自然分离、多级复叠的原理,可以使用单台制冷压缩机,通过2级气液分离和热交换,实现复叠式制冷系统才能达到较低的蒸发温度和制冷能力,同时简化了控制系统,提高了制冷系统的可靠性。 相似文献
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有压与常压热水锅炉供热系统循环泵的比较 总被引:1,自引:0,他引:1
推导了有压、常压热水锅炉供热系统循环泵功率的计算式。计算比较了同一供热系统,分别采用有压、常压热水锅炉供热系统的循环泵质量流量、功率。 相似文献
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简述了国内外对LCNG冷能利用的研究及应用现状,设计了一种LCNG加气站冷热电三联供系统,该系统包括LCNG气化站系统和冷热电三联供系统。LCNG气化站系统包括LNG储罐、抽风机、LNG-冷媒换热器以及CNG压缩机;冷热电三联供系统包括冷媒-制冷剂换热器、冷媒储罐、发电机、废热回收装置、充电桩。LNG通过管道依次连接抽风机、LNG-冷媒换热器、冷媒储罐、冷媒-制冷剂换热器,再通过制冷循环将冷量传递到室内。本系统的有益效果是:LCNG气化站系统耦合冷热电三联供系统,实现能量梯级利用;天然气用于发电,产生的电能供充电桩使用,利用废热回收装置收集发电产生的热量,用于预热燃烧室入口端的天然气,提高发电效率;利用废热回收装置收集的热量加热LNG,使之转变为天然气,替代水浴式加热器的使用,起到节能的效果;本系统可以与传统的石化加油站结合,实现"油气电非"的综合使用。 相似文献
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High initial cost of power plant, limited power capacity of the existing plant and the frequent black out of many districts due to the continuous increase in electrical demands, in addition to the adverse effect of the blackout on hypermarkets, especially on foodstuff such as meat, chicken, etc. strongly encourage the adoption of a regenerating process and the principle of combined heat and power. This work investigates the upgrading of the combined cooling heat and power system and improving the regenerating process adopted in the first design of an existing project. Linking between refrigeration and air-conditioning systems is proposed in scheme-II. A single-effect absorption chiller operating in the range of refrigeration scale (i.e. aqueous-ammonia refrigeration, not air-conditioning scale, LiBr–H2O employed in scheme-I) will be adopted using pressurised hot water recovered from the generators. The chilled water system will be serving three categories in the following order, namely, refrigeration stores, cold stores and air-conditioning units, respectively. The chilled water output of the first category will be the input of the second one. This will enhance the overall system efficiency, reduce the generator load and lessen the fugitive refrigerant emissions, which mainly participate in ozone-depleting potential and global-warming potential. This is in addition to the dramatic reduction in initial and operating cost, which can be estimated to be 50% and 79.6%, respectively. 相似文献
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喷射式制冷系统的性能在很大程度上取决于制冷工质的选择。建立了喷射式制冷系统分析的简单模型,并采用EES软件编制程序,分析了7种比较典型的制冷工质对喷射式制冷系统的影响。 相似文献
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I Vinoth Kanna 《国际自然能源杂志》2020,41(11):1276-1283
ABSTRACT The refrigeration and air conditioning system is a booming research in the research area. In refrigeration, the scientists focus on the new refrigerant in order to reduce the global warming potential (GWP), high coefficient of performance (COP) and meet zero ozone depletion potential (ODP). Not only the new refrigerant as a solution to attain zero ODP, high COP and at the same time to optimise the design of refrigeration system to meet ODP and COP as a required level. This paper aims to optimise the design of a double refrigerator evaporator for a refrigerator employing non ozone-depleting hydrocarbon refrigerant using brine as a secondary solution with a low GWP. It is done by numerical modelling followed by the parametric modelling using CATIA V5. 相似文献