The process flow diagram is as follows.
100kg/h of COAL fed into decompose reactor with composition moisture=3.3wt%, volatile matter = 37wt%, fixed carbon = 54.5 wt%, and ash = 5.5wt% (as per proximity analysis); Carbon = 80.7wt%, H=5.5wt%, N= 1.7wt%, S= 0.6wt%, O=11.5wt% (ultimate analysis), the lower heating value of coal is given as 29.1MJ/kg. Coal is decomposed in a decomposition reactor and fed to a gasifier along with steam (flow rate 140kg/h)..
The reaction in the decomposition reactor is coal decomposes to volatile matter and char.
In the gasification reactor, volatile matter and char reacts to produce CO, H2, CO2, H2O and ash. This ash is separated and remaining gas composition is carbon monoxide (34.5 mole%), hydrogen (50.3 mole%), carbon dioxide (2.4mole%) , water (12.3 mole%).
I would like to know the flow rate of this ash free gas. In the above drawing it is shown as "SYNGAS".
Could you please help me in calculating the mass flow rate of SYNGAS stream flow rate?
Hello Ratnakumar,
at first glance, I would say that you simply set up the mass balance. You have defined your input mass flow and you know the composition of the syngas. With a stoichiometric or time-dependent assumed conversion, you can then calculate the fraction of syngas from the reaction equations or using the conversion rate. The mass must be conserved. The rest, assuming only these 2 streams are involved in the system, should be the ash.
Is there any other data available ?
What reaction equations do you use or other assumptions are in your system ?
Hello Ratnakumar Kappagantula
I do not know if I understood well, but according to your description and the image, you can directly know the stream flow getting into the stream results (right click in syngas stream) . Just one comment, you have different ways to specify the outlet streams in terms of phases. By default, if only one steam is added, then you should use a gas-solid separator, to split the solid fraction (i.e., conventional and/or nonconventional) from the gas one. In that way you will have only a syngas stream.
Good luck,
How much O2 are you using? From the figure I assume you are using Hysys or Aspin. The reaction will go pretty close to equilibrium. Products will be CH4,CO,CO2 and H20. and S or N will form SO2 or NO/NO2 at or near equilibrium
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