CS2 + 3 O2 -> CO2 + 2 SO2
H2 + 1/2 O2 -> H2O CO + 1/2 O2 -> CO2 2 NH3 + 1,5 O2 -> N2 + 3 H2O H2S + 1,5 O2 -> SO2 + H2O COS + 1,5 O2 -> CO2 + SO2
Hi Daniel. I guess this is the error: If compounds(i).Elements.ContainsKey("C") And compounds(i).Elements.ContainsKey("H") Then... If the stream contains either hydrogen or carbon monoxide it doesnt calculate a heating value. If only hydrocarbons are used in the calculation, I would rename the plugin to "Hydrocarbon combustion" or something else. The user is not notified that it only uses hydrocarbons..
Thanks Frank. I updated the original post. I get similar value. There most be something wrong with the calculation in DWSIM
Hi everyone. I have entered a syngas stream (22% CO, 36%H2, 35%CO2, 1,3%CH4, 5,5%H2O, 0,2%N2) and wanted to know the heat of combustion for the stream. The calculated value of 702,6 kJ/kg and 11271 kJ/kmol doesnt make sense. I can understand if there is a typo and it is 11271 kj/nm3... Do others get values that make sense? Br Michael
Hi everyone. I have entered a syngas stream (22% CO, 36%H2, 35%CO2, 1,3%CH4, 5,5%H2O, 0,02%N2) and wanted to know the heat of combustion for the stream. The calculated value of 702,6 kJ/kg and 11271 kJ/kmol doesnt make sense. I can understand if there is a typo and it is 11271 kj/nm3... Do others get values that make sense? Br Michael
Thanks Frank. I get similar value. There most be something wrong with the calculation in DWSIM
Hi everyone. I have entered a syngas stream (21,9% CO, 35,8%H2, 35%CO2, 1,4%CH4, 5,7%H2O, 0,02%N2) and wanted to know the heat of combustion for the stream. The calculated value of 702,6 kJ/kg and 11271 kJ/kmol doesnt make sense. I can understand if there is a typo and it is 11271 kj/nm3... Do others get values that make sense? Br Michael
That seems to have done it Daniel. I ran 2-3 calculations that crashed before and now they are calculating. Will do some more testing tomorrow. Thanks!
I checked the MD5. It is correct. Still same problems..
I tried by using the same link as given before but same result. Pasted the error log. Is the link correct? Br Michael
now with file
Hi Daniel. Just tried it and that hasnt made any difference.. I am still getting a lot of errors in the logs. See attached.
Btw. it seems as it is a required library even if the checkbox for IPOPT is unchecked.. At least I get crashes without that being checked. Do you have an idea of when next release is due? Thanks. Michael
Great. I look forward to the next version. Br Michael
I dumped the log to a txt file, which is attached.
Yes. Downloadd it yesterday.
No it is on a macbook pro retina from 2012 so standard intel based.
If I disable to IPOPT Solver the calculation runs fine.. I think it is a general problem for all calculations as the error is reproducible. What does the IPOPT solver do?
Hi Daniel. I tried taking screenshots of crashes from two different files I tried running. Hope it helps in solving it. Br Michael
No that doesnt help. If I add water and change to isothermal operation of the eq reactor the calculation breaks. I tried setting up a MeOH eq reactor and that also breaks even as an adiabatic reactor..
Attached
Sure. I have attached a video
Hi Daniel. First of all thanks for the amazing work you are doing. I unfortunately constantly run into crashes in the program (the program suddenly exits when performing a calculation). I am running DWSIM on a mac mostly but have also experienced it in windows. Is there a way you can step through the calculation to prevent it from crashing? Or maybe another way for a user to analyse why it happends? That would make me a lot happier if I can understand and then solve the problem myself. Best Regards...
Hi Daniel. Is there any way to manipulate the xml from an xml editor? I have not worked with compressed xml files before.. Is there any particular reason for choosing compressed xml (besides the file size)? Br Michael
Hi Daniel. Thanks for the solution but were can I set the reaction basis? Is it exposed in the mac UI? I cant find it anywhere.... I did select the reaction to be in the vapor phase which I suppose would select it to use fugacities?
The data would fit more nicely if the conversion was off with a factor 10 (approx 8% conversion).. That would give an adiabatic temperature closer to 345 degC acc. to the calculations in the book compared to 371 degC from DWSIM....
Hi Daniel. Yes the reaction is endothermic (69,11 kJ/mol). The conversion extent reported by the equillibrium reactor is off by a factor of 100 compared to my school teaching (mol compound out - mol compound in)/stoeff coeff.. I will try to calculate it with spreadsheet tomorrow... Br Michael
Hi Everyone. I am having trouble reproducing an example from "elementary principles of chemical processes" by Felder and Roussau (dehydrogenation of ethanol to ethanal and hydrogen at 400 degC in an adiabatic reactor (30% conversion of ethanol)).. The equillibrium conversion is 81% but the adiabatic temperature is 371 degC while the book gets an adiabatic temperature of 145 degC with only 30% conversion? I checked that the inlet enthalpy and standard heat of reaction are the same for the calculations.....
Now it works!! Thanks :-)
Hi Frank. When I try to run your calculation it gives an error: [7/4/2020 2:01:07 PM] RG-004: Maximum number of iterations reached. I tried increasing the both internal and external iterations but no luck in solving it.. I am on a mac with newest version 6.4.. Br Michael
Hi Daniel. Yes that solved it for me as well! That was a great help
Hi Daniel. First and foremost thanks for helping and creating the software. I really like the newest edition of the interface! It is much more effective. I am using the latest 5.6 update 12 but on a MAC.. Please see the screenshot.. Hi Frank. I had made my own unit system but also tried with the standard SI system and it gave the same result? Thanks for helping out. Br Michael
Hi everyone. I am quite new to DWSIM but find it an amazing development by Daniel. I have tried it several times and despite having read alot of information online I constantly get stuck or find myself puzzled of the calculated solution. I am using the newest version of the program from a mac.. Here is my 1st problem: I have set up a combustion reaction btw. methane and oxygen at 200 degree C and 10 barg. 0.2 CH4 and 0.8 Oxygen, adiabatic, 100 % conversion (conversion reactor) and using ideal gas...