How to use Aspen Plus to simulate the temperature changes in a storage tank after diluting concentrated sulfuric acid to a certain volume, followed by cooling in a heat exchanger...
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Concentrated sulfuric acid and water are fed into the storage tank in a certain volume ratio (concentrated sulfuric acid:water = 1:20), and the total capacity of the mixed fluid in the tank is 40 L. Then, a heat exchanger is used to circulate and cool the liquid inside the storage tank. Heat exchanger parameters: heat transfer area of 2.5 m2, counterflow, overall heat transfer coefficient: 1000 W/m2·℃. Cooling water: inlet pressure 1 bar, flow rate 10 L/min, inlet temperature 17 degrees Celsius. It is hoped that the temperature variation curve inside the storage tank can be obtained using Aspen Plus. I’m not very skilled; I’ve created a model of my own, but it contains many errors. I hope the seniors can answer my questions. Question 1: The storage tank is only filled with a specific volume of material, after which no more material flows in. It is not a continuous operation; is an intermittent reactor necessary? Question 2: The calculation results indicate a violation of conservation of mass and energy. How should this be adjusted?
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I tried to build a dynamic simulation process on my own to meet the original poster’s requirements, but it didn’t work. The process described by the original poster consists of two steps: first, heating the mixture with sulfuric acid, and second, cooling it through external circulation. In my case, I used an intermittent distillation tower module for the external circulation cooling, which basically meets the requirements of the second step outlined by the original poster. I would also like to ask: for cooling water with an inlet pressure of 1 bar, a flow rate of 10 L/min, and a heat exchange area of 2.5 m2, how is it possible to achieve a total heat transfer coefficient of 1000 W/m2·℃? In my opinion, such a low flow rate means that the flow velocity inside the heat exchanger should be quite slow; so how is this heat transfer coefficient achieved?