How much does a fluidized bed cost?
This included defining the installed cost of a fluidized bed reactor to be $10,000 per square Page 22 16 meter of heat transfer surface.
What type of reactor is fluidized bed?
heterogeneous catalytic reactors
Fluidized bed reactors are heterogeneous catalytic reactors in which the mass of catalyst is fluidized. This allows for extensive mixing in all directions. A result of the mixing is excellent temperature stability and increased mass-transfer and reaction rates.
What is fluidized bed reactor used for?
Fluidized bed reactors are widely used in material processing industries for processes that require good heat and mass transfer between particles and a gas. The energy provided to the fluidized bed typically comes from the warm gas that fluidizes the bed as well.
How does a fluidized bed reactor work?
In this type of reactor, a fluid (gas or liquid) is passed through a solid granular material (usually a catalyst) at high enough speeds to suspend the solid and cause it to behave as though it were a fluid. This process, known as fluidization, imparts many important advantages to an FBR.
What is a fixed bed reactor?
Fixed bed reactors (Fig. 6.2) are the simplest type pf reactor to design, and consist of solid catalyst particles being loaded and packed into the bed.
How do you calculate the volume of a packed bed reactor?
Popular Answers (1)
- Space velocity = flow rate of the reactants/ the reactor volume.
- GHSV =Hourly volumetric feed gas flow rate/reaction volume.
- LHSV= Hourly volumetric feed liquid flow rate/reaction volume.
- WHSV=Hourly mass feed flow rate/ Catalyst mass.
What does the minimum fluidization velocity in the bed depends on?
The minimum fluidization velocity depends on particle moisture content; increasing moisture content increases the minimum fluidization velocity. The pressure drop increases with increasing gas velocity, as more particles need to be suspended.
When would you use a plug flow reactor?
Plug flow reactors are used for some of the following applications:
- Large-scale production.
- Fast reactions.
- Homogeneous or heterogeneous reactions.
- Continuous production.
- High-temperature reactions.
What are the types of fluidization?
Based on different Geldart particle groups and gas velocities, several different fluidization regimes can be observed: fixed bed, homogeneous fluidization, bubbling fluidization, slugging fluidization, turbulent fluidization, and entrainment process.
What is the difference between CSTR and PFR?
A PFR has a higher theoretical efficiency than a CSTR of the same volume. That is, given the same space-time (or residence time), a reaction will proceed to a higher percentage completion in a PFR than in a CSTR.
Which is the best description of a fluidized bed reactor?
For other topics on fluidization, see Fluidized bed technology, Fluidized bed combustion and Fluidization. A fluidized bed reactor ( FBR) is a type of reactor device that can be used to carry out a variety of multiphase chemical reactions.
Why are hot spots avoided in a fluidized reactor?
Local hot or cold spots within the reaction bed, often a problem in packed beds, are avoided in a fluidized situation such as an FBR. In other reactor types, these local temperature differences, especially hotspots, can result in product degradation.
What happens when a reactant expands in a fluidized reactor?
If it is a liquid the bed expands uniformly with increased upward flow of the reactant. This is called homogenous fluidization. If the reactant is a gas the bed will be non-uniform because the gas forms bubbles in the bed, resulting in aggregative fluidization.
Why do we need a packed bed reactor?
Packed bed reactors are for carrying out bio-processes by immobilized bio-catalysts. Such catalyst material is presumed to be special in nature and spears when loaded will provide static anchorage. The active medium can be fed from the bottom or top of the column and forms a continuous liquid phase
