Can’t the carbon capture system cycle stop?
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When simulating conventional carbon capture systems (including absorption towers, rich liquid pumps, rich-lean liquid heat exchangers, and regeneration towers), I took into account the difficulty in achieving convergence of the circulation process; therefore, I interrupted this circulation. Specifically, the lean liquid that flows out of the regeneration tower would normally need to pass through the rich-lean liquid heat exchanger and a cooler before returning to the absorption tower, but in my simulation I did not send it back to the absorption tower first. The possible loss of the absorption solution during the cycle is also taken into account, so a calculator module has been provided for compensation. During disconnection, the process simulation yields no errors, and based on the simulation results, the calculator module can indeed ensure that the temperature, pressure, and flow rate of the lean liquid returning to the absorption tower are close to their initial values. Therefore, after I finished creating the loop links and tried to simulate it again, I found that the loop produced no results at all; it kept going back and forth without stopping. What is the reason for this? How can this problem be solved? Please offer some suggestions.
There could be several possible reasons why the cycle keeps running. First, you can check whether each component in the cycle is working properly, such as the absorption tower, the rich liquid pump, the rich- and lean-liquid heat exchanger, etc. If any one of the components fails or does not function properly, it can cause the cycle to stop. Additionally, you can also check whether there are any energy balance issues during the cycle. In carbon capture systems, energy balance is very important to ensure the balance of temperature and pressure among various components. If there is a problem with the energy balance, it can also cause the cycle to not stop. Additionally, you can also check whether the settings of the simulation parameters are correct. Ensure that the values and ranges of various parameters are set reasonably and in line with actual conditions. If the above methods do not solve the problem, you can try using different cycling strategies or adjusting the cycle parameters, such as flow rate, temperature, or pressure, to see if that can resolve the issue of the cycle not stopping. Of course, the best solution is to consult engineers or experts in the relevant field, who can provide more targeted advice and solutions based on the specific circumstances. .
You can try turning off the design constraints; having such constraints makes it harder to reach convergence
It mainly depends on whether the energy balance is correct; then the causes of the problems need to be identified one by one
It’s mainly about material balance; even the slightest error can lead to significant problems, as materials accumulate over time