4/20/2021 0 Comments Aspen Plus Solids
In a fluidized bed simulation, more equations are used to calculate a more detailed result, but these are the most basic and important equations when designing a fluidized bed reactor (University of Michigan, 2016).Chemical Process Engineering Simulation is a blog where I will share information regarding Chemical engineering process design, equipment design, process simulation, process intensification, process optimization and much more.This reactor has an advantage over traditional packed bed reactor because it has a better heat and mass transfer.In industry, the fluidized bed reactor is most prominently used to produce products which cannot be efficiently manufactured using more commonly using more commonly used reactors (Towler, 2012).
A fluidized bed reactor is used to produce a variety of products. In the fuel industry, a fluidized bed reactor is used to produce gasoline, propane, butane, and propylene (Washington University, 2016). While these are some of the common uses of fluidized bed reactor, good mixing, and energy efficient nature of the reactor allows a fluidized bed to be used in producing a less conventional fluidized bed reactor product such as photovoltaic cells. ![]() Unlike the traditional method of covering seed rods with a superheated silicon gas, the method used by REC Silicon lets the seed granules to float inside a fluidized bed reactor. Then, silane gas enters from the bottom and when it comes in contact with the seed granule, the gas breaks down and covers it with silicon. Once enough silicon layer is sufficiently deposited, the larger and heavier granules exit the fluidized bed reactor. This process consumes 80-90 less energy than the traditional method (REC Silicon, 2016). Aspen Solids Manual Calculation IsFor most purposes, such manual calculation is not only tedious but also has a great chance of yielding an incorrect result. ![]() Unfortunately, however, Aspen HYSYS does not have a good way to handle solids in streams. Furthermore, it does not have advanced reactors such as the fluidized bed reactor. Aspen Plus allows the users to handle solids and model a fluidized bed reactor (AspenTech, 2014). Also, the fluid of the reactants entering the reactor from the bottom should be above the minimum fluidization velocity of the particle, which is the minimum linear velocity of the reactant to keep the solid particles in the air (Brown, 2008). Furthermore, the simulation may not correctly reflect what really happens in the reactor. For example, Aspen Plus requires an entering and exiting streams of solid particles in the simulation (AspenTech, 2014). However, in a real fluidized bed reactor, a fixed amount of catalyst is put into the reactor and kept from leaving the reactor by controlling the fluidization velocity. The catalysts are switched when their life cycle is done and this switching of catalyst could be modeled as a continuous flow of solid particles. However, it is important to note that what is on the flow sheet of the simulation may not be a correct representation of the real system. However, the following design equations are the core equations. Similarly, Kbc, Kce are mass transfer coefficients between bubble and cloud and cloud and emulsion. Lastly, the three concentrations are the concentration of the species A in three phases.
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