板翅式换热器物流分配对天然气液化性能的影响
发布时间：2018-07-16 20:47
【摘要】：板翅式换热器入口物流分配不均是造成换热效能降低的主要因素之一,对天然气液化装置稳定和高效的运行产生不利的影响。针对氮气膨胀和混合制冷剂两种天然气液化工艺,分别研究原料气、氮气制冷剂和混合制冷剂物流分配不均对换热器参数和液化工艺性能的影响,得到换热器入口物流分配不均匀度STD(standard deviation,均方差)的临界值,为换热器的选型和天然气液化工艺的设计提供依据。结果表明:相同STD值下,天然气液化性能受不同物流分配不均影响程度大小依次为氮气制冷剂、混合制冷剂和原料气;倾斜严重影响混合制冷剂的分配及换热效果,倾斜角度由0°增加至20°时,液相STD值由1.3增至3.9,天然气液化率从92.8%降至69.4%;为满足天然气液化率在90%以上,原料气、氮气制冷剂及混合制冷剂物流分配的临界STD值分别为8.3、2.8、4.5(液相),混合制冷剂倾斜工况临界STD值为1.5(液相),对应倾斜角度为1.6°。
[Abstract]:The uneven distribution of inlet material flow in plate-fin heat exchangers is one of the main factors leading to the decrease of heat transfer efficiency, which has adverse effects on the stable and efficient operation of natural gas liquefaction units. The effects of raw gas, nitrogen refrigerant and mixed refrigerant on the parameters of heat exchanger and the performance of liquefaction process were studied respectively in view of the nitrogen expansion and mixed refrigerant liquefaction processes, and the effects of raw gas, nitrogen refrigerant and mixed refrigerant on the parameters of heat exchanger and liquefaction process were studied. The critical value of inhomogeneity in inlet distribution of heat exchanger (STD (standard deviation, RMS) is obtained, which provides the basis for the selection of heat exchanger and the design of natural gas liquefaction process. The results show that under the same STD value, the degree of natural gas liquefaction affected by the uneven distribution of different logistics is nitrogen refrigerant, mixed refrigerant and feedstock gas, and the inclination seriously affects the distribution and heat transfer effect of mixed refrigerant. When the inclination angle is increased from 0 掳to 20 掳, the STD value of liquid phase increases from 1.3 to 3.9, and the liquefaction rate of natural gas decreases from 92.8% to 69.4%. The critical STD value of nitrogen refrigerant and mixed refrigerant is 8.3N 2.84.5 (liquid phase), and the critical STD value of mixed refrigerant is 1.5 (liquid phase). The angle of inclination is 1.6 掳.
【作者单位】： 中国石油大学(华东)储运与建筑工程学院山东省油气储运安全省级重点实验室青岛市环海油气储运技术重点实验室;中国寰球工程公司;
【基金】：国家自然科学基金(51504278) 山东省优秀中青年科学家科研奖励基金(BS2014ZZ009) 青岛市应用基础研究计划(14-2-4-81-jch)资助
【分类号】：TE646;TK172
，
本文编号：2127626
[Abstract]:The uneven distribution of inlet material flow in plate-fin heat exchangers is one of the main factors leading to the decrease of heat transfer efficiency, which has adverse effects on the stable and efficient operation of natural gas liquefaction units. The effects of raw gas, nitrogen refrigerant and mixed refrigerant on the parameters of heat exchanger and the performance of liquefaction process were studied respectively in view of the nitrogen expansion and mixed refrigerant liquefaction processes, and the effects of raw gas, nitrogen refrigerant and mixed refrigerant on the parameters of heat exchanger and liquefaction process were studied. The critical value of inhomogeneity in inlet distribution of heat exchanger (STD (standard deviation, RMS) is obtained, which provides the basis for the selection of heat exchanger and the design of natural gas liquefaction process. The results show that under the same STD value, the degree of natural gas liquefaction affected by the uneven distribution of different logistics is nitrogen refrigerant, mixed refrigerant and feedstock gas, and the inclination seriously affects the distribution and heat transfer effect of mixed refrigerant. When the inclination angle is increased from 0 掳to 20 掳, the STD value of liquid phase increases from 1.3 to 3.9, and the liquefaction rate of natural gas decreases from 92.8% to 69.4%. The critical STD value of nitrogen refrigerant and mixed refrigerant is 8.3N 2.84.5 (liquid phase), and the critical STD value of mixed refrigerant is 1.5 (liquid phase). The angle of inclination is 1.6 掳.
【作者单位】： 中国石油大学(华东)储运与建筑工程学院山东省油气储运安全省级重点实验室青岛市环海油气储运技术重点实验室;中国寰球工程公司;
【基金】：国家自然科学基金(51504278) 山东省优秀中青年科学家科研奖励基金(BS2014ZZ009) 青岛市应用基础研究计划(14-2-4-81-jch)资助
【分类号】：TE646;TK172
，
本文编号：2127626
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