Regarding oxyfuel and post combustion CO2 capture

[Yuvraj Goyal]

Dear Team,

Thank you for such a great open software. I have the following two queries:

1) For the sulphur content of 0.5%-1.5%, the configuration Oxyfuel Med S has only a fabric filter and lime spray dryer. Why are the above air pollution control units fixed for this configuration? As in some countries, ESP and Wet FGD exist in the plant to which the oxyfuel capture technology is retrofitted.

2)In the post-combustion capture, there are three choices of solvent MEA, FG+, and Cansolv. Among these, for the same coal quality and operating parameters, the CO2 unit compression energy is decreased for the FG+ and Cansolv solvents. What is the reason for assuming the reduction in power requirement for the solvents? As for the same coal quality and the operating parameters, the power requirement by the capture unit can vary, but the compression unit energy requirements for almost the same volume should be same.

Thank you 

[Karen Kietzke, Programmer, IECM]

For question 1, the Oxyfuel High S configuration gives you the option of ESP and Wet FGD. The model will warn you if the sulfur content of your coal is "too low", but there isn't actually an issue unless it's too high. (We'll be removing the "too low" warning.) Does the High S configuration work for you?

We'll get back to you on question 2.

[Yuvraj Goyal]

Thank you for the response

Yes, the high S configuration would work for our study. 

Furthermore, we eagerly anticipate your response to question 2. Your insights and expertise are invaluable to our research efforts.

On a related note, we encountered an error during the modeling process of the oxyfuel power plant with O2 purity set at 95% and 96%. The error message displayed was "Maximum iteration count exceeded". What does it mean when it says about the iteration?

Thank you once again for your ongoing support and collaboration.

[Karen Kietzke, Programmer, IECM]

Regarding question 2, the CO2 unit compression energy calculation uses a smaller factor for FG+ with a 6-stage compressor in accordance with the NETL 2007 baseline report. Switching between MEA and Cansolv shouldn't change the CO2 unit compression energy, but using an 8-stage compressor will result in a lower value. Are you by some chance using an 8-stage compressor in the Cansolv case?

The "Maximum iteration count exceeded" message means that something didn't converge within the maximum number of iterations. Unfortunately I'm not able to replicate this on my end. Could you give more details about your configuration? If you're not comfortable doing that here, or if you want to send us a session database with the session in question, you can send it to us at iecm...@uwyo.edu. Thanks!