Pre-dryer model in an incinerator

[mickaelahr]

Hello everyone,
I'm a master student and I'm working on a project to model a simplified incinerator with Solph, Tespy, DHNx and RESIE. The goal is to understand which one is the most appropriate for that.

My biggest issue right now is with TESPy to model the municipal waste with CoolProp. There is data on internet on the kind of garbish the incenarotor get.... but I dont know how to translate it in CoolProp.
The data I found talk about wood, textile and glass but the majority of it are organic stuff, I was wondering if it is easier to model organic ?

Second issue is that the excess heat should return to the waste entry in order to dry them but I dont know if these tools are able to do that...

Thanks you for your time

[fwitte]

Hi @mickaelahr,

I believe, there are possibilities to do this, but it could be quite tricky. It depends on what you actually want to achieve with the modeling. Here are some thoughts under the assumption you want to do stoichiometry/combustion calculations and not just basic energy balances:

• To represent the waste you might be able to use the IncompressibleFluidWrapper class, which can do lookup table data interpolation for you: https://tespy.readthedocs.io/en/main/advanced_features/fluid_properties.html#incompressible-wrapper-label. You would need at least heat capacity as function of temperature for the waste (it could also just be a constant). Density and viscosity are not so important in this context.
• Furthermore, you need to know the stoichiometry of the combustion reaction, meaning you will need some sort of information on the molecular composition of the waste to be able to calculate the correct amount of oxygen required to combust the waste.
• For the drying you can model a mixture of the waste with liquid water which can evaporate and the vapor is removed from the stream together with the drying gas again (?), the remaining liquid water will cool the reaction I guess. However, for this mixture you might need to formulate a new mixing rule which calculates the mixture properties from the individual mixture components.

If I was you I would try to formulate the basic equations/relationships of the individual units involved first, try to implement that on a per unit level and later bring it all together in a model.

Maybe that is helpful to start

Best

Francesco

[mickaelahr]

Thank you for your answer.

This is my code and my idea was to link out2 of hex to in2 of comb, in order to use the excess that my demand doesnt want. Does it make any sens ?

On site, the idea is to use the incinerator output to pre heat the wet waste as you understood.

Thanks you for your time