When HYSYS is simulating a distillation column, the reboiler does not converge
Thread Content
I am simulating the reboiler of a distillation column, and I’m encountering consistency errors with the reboiler – specifically an issue of overdefinition. I haven’t been able to find the cause yet; I hope experts will kindly offer their guidance.
Hello, there are many possible reasons why the reboiler does not converge. Here are some possible causes along with corresponding solutions: 1. The initial parameters of the distillation tower are set improperly; for example, an excessively low temperature at the condenser outlet results in a too low feed temperature for the reboiler. Solution: Check the initial parameters of the distillation tower, especially whether the temperature setting of the condenser is appropriate. 2. The flow rate setting of the reboiler is incorrect, for example, the feed flow rate is too high or too low. Solution: Check the flow settings of the reboiler; try adjusting the feed flow or reducing the outlet flow to lower the pressure, thereby achieving balance. 3. Problems arose with the physical property parameters, such as incorrect settings for the physicochemical properties of the components. Solution: Check whether the physicochemical property settings for the components are correct, and make any necessary corrections. 4. The grid settings are unreasonable, such as too low grid density or overly large grid cells. Solution: Check whether the grid settings are appropriate, and try adjusting the grid density or the size of the grid cells. 5. A material balance issue arose during the simulation. Solution: Check whether the material balance equation is correct, and gradually eliminate possible sources of error. I hope the above suggestions can help you solve the problem. If you have any other questions, feel free to ask. .
After making adjustments, my distillation column model has converged. However, when trying to return the condensate from the top of the column back to it as reflux, the model fails to converge again. The reason for this is that the loads on the condenser at the top of the column and the reboiler at the bottom are unknown; I would appreciate guidance from experts
The condensate is directed to the distillation tower; there is a significant deviation between the flow rate and the natural flow pattern. Try specifying a certain component and making fine adjustments to see if convergence can be achieved