Activity for Michael Jensen
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Michael Jensen posted a comment on discussion Open Discussion
CS2 + 3 O2 -> CO2 + 2 SO2
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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
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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..
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Thanks Frank. I updated the original post. I get similar value. There most be something wrong with the calculation in DWSIM
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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
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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
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Thanks Frank. I get similar value. There most be something wrong with the calculation in DWSIM
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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
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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!
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I checked the MD5. It is correct. Still same problems..
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I tried by using the same link as given before but same result. Pasted the error log. Is the link correct? Br Michael
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now with file
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Hi Daniel. Just tried it and that hasnt made any difference.. I am still getting a lot of errors in the logs. See attached.
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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
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Great. I look forward to the next version. Br Michael
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I dumped the log to a txt file, which is attached.
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Yes. Downloadd it yesterday.
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No it is on a macbook pro retina from 2012 so standard intel based.
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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?
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Hi Daniel. I tried taking screenshots of crashes from two different files I tried running. Hope it helps in solving it. Br Michael
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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..
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Attached
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Sure. I have attached a video
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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...
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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
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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?
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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....
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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
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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.....
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Now it works!! Thanks :-)
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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
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Hi Daniel. Yes that solved it for me as well! That was a great help
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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
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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...
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