Exergy loss analysis of heat transfer across the wall of the dividing-wall distillation column
Exergy loss analysis of heat transfer across the wall of the dividing-wall distillation column
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DOI：
10.1016/j.energy.2007.04.006
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发表时间：
2007-11
期刊：
影响因子：
9
通讯作者：
B. Suphanit;A. Bischert;P. Narataruksa
中科院分区：
文献类型：
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作者：
B. Suphanit;A. Bischert;P. Narataruksa
间壁蒸馏塔在热力学上与Petlyuk 塔等效，条件是间壁不允许传热。然而，如果传热发生在壁的特定部分内，则可以获得更好的塔能量效率。可以使用塔综合曲线（CGCC）来分析穿过分隔壁的传热效果。通过观察沿着分隔壁的两个塔段的 CGCC 可以观察到跨壁的传热潜力。然而，在 CGCC 召开之前，尚不清楚在任何阶段是否应该增加或拒绝供热的可能性。因此，在这项工作中，火用分析应用于间壁塔，以确定是否应在任何特定阶段添加或拒绝热量。同时，将塔内最小火用损失值作为确定任意阶段热负荷目标的标准。然后可以将这些载荷目标绘制为类似于 CGCC 的 T-H 剖面。据报道，该方法成功应用于具有多种进料和产品的塔。在确定了穿过分隔壁的可行传热的位置和数量后，通过三个案例研究讨论了其好处。
The dividing-wall distillation column is thermodynamically equivalent to the Petlyuk column on the condition that no heat transfer is allowed across the dividing wall. However, better energy efficiency of the column may be obtained if heat transfer occurs within a certain part of the wall. The effects of heat transfer across the dividing wall can be analyzed by using the column grand composite curve (CGCC). The heat transfer potential across the wall can be observed by looking at the CGCC of both column sections alongside the dividing wall. However, the possibility of whether heat should be added or rejected at any stage is not clearly known ahead of the CGCC. Consequently, in this work, the exergy analysis is applied to the dividing-wall column in order to determine whether heat should be added or rejected at any particular stage. Also, the minimum exergy loss value in the column is set as the criterion for determining the heat load targets at any stage. These load targets can then be plotted as a T–H profile similar to the CGCC. This methodology was reported to successfully apply to the column with multiple feeds and products. After having identified the locations and quantities of the feasible heat transfer across the dividing wall, the benefits are discussed via three case studies.