多股流板翅式換熱器的傳熱溫差場(chǎng)優(yōu)化研究
[Abstract]:Plate-fin heat exchanger is an efficient compact heat exchanger, which is widely used in petrochemical, gas separation and natural gas liquefaction industries. Compared with the two flow heat exchangers, the multi-flow plate-fin heat exchanger has more fluid media, more complicated structure and heat transfer process, and the velocity field and temperature difference field of different fluid in each channel interact with each other and cooperate with each other. Many factors make it difficult to study and optimize the performance of multi-flow plate-fin heat exchanger. In this paper, the heat transfer process of plate-fin heat exchanger in plate-fin heat exchanger with mixed working fluid is taken as the research object, and the heat transfer integration curves of two kinds of heat transfer modes are compared by Aspen plus simulation. The results show that independent heat transfer can not meet the requirements of heat transfer process. For fully coordinated heat transfer and independent heat transfer processes? The results show that the heat transfer is independent. Damage is coordinated heat transfer? More than ten times the damage, synergistic heat transfer? The efficiency reaches 92.82%, but how many different flow ratios are independent heat transfer? The efficiency is about 45%, which indicates that the total synergistic heat transfer can be reduced. Loss and enhancement of multistream heat transfer processes? Efficiency. In order to study the influence of channel alignment on the heat transfer performance of plate-fin heat exchanger, the zigzag diagrams of several different channel arrangement corresponding to the heat transfer process of multi-strand flow were simulated and compared by using the plate-fin heat exchanger design software Aspen Muse. According to this figure, the channel arrangement is evaluated. In the process of simulation, it is found that the Aspen Muse software has some limitations, so this paper establishes a model for the multi-strand flow plate-fin heat exchanger, calls the mixed working fluid physical property database of Aspen Plus, and uses VBA to compile the program. Chen formula is used to calculate boiling heat transfer coefficient and Shah formula to calculate condensation heat transfer coefficient. The simulation software was used to calculate the heat transfer process of multi-stream flow in the process of natural gas liquefaction, and the effect of the superimposed adjacent cold flow on the whole heat transfer process was compared and analyzed. By changing the heat transfer resistance between adjacent cold flows and analyzing the heat transfer temperature difference field, the results show that if the synergy between adjacent cold flows is not taken into account in the calculation process, the heat transfer process will not be carried out, and the better the synergy between adjacent cold flows is, The larger the heat transfer of multi-strand flow, the better the heat transfer effect. It shows that the synergy between adjacent cold flows is very important for the whole heat transfer process of multi-stream flow. Therefore, in the design of multi-stream plate-fin heat exchangers, the effect of coordinated heat transfer between adjacent cold flows should be included.
【學(xué)位授予單位】:華南理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:TK172
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