Onsite Research
Fluid-Bed Gasifier/Modular Gas Cleanup Rig
NETL is developing a technology base for tomorrow's highly efficient, near-zero-emissions
power plants including FutureGen. One of the promising technologies NETL is
pursuing is advanced fluidized-bed combustion (FBC). Pressurized FBC (PFBC)
systems use a mixture of burning coal, a sorbent such as limestone or dolomite,
and jets of air to produce a high-pressure gas stream at temperatures that
can drive a gas turbine. Steam generated from the heat in the fluidized bed
may be sent to a steam turbine, creating a highly efficient combined-cycle
system. Removing and recovering particulates and contaminants from the gas
and steam are accomplished in treatment vessels once combustion has occurred.
PFBC may also play a role in hydrogen fuel production.
NETL's integrated Fluid-Bed Gasifier/Modular Gas Cleanup Rig is helping to
demonstrate advanced features of FBC. Researchers are developing the technology
base needed to lower capital and production costs to levels that are commercially
feasible, leading to systems with near-zero emissions, including capture and
subsequent storage of CO 2 in suitable geological formations. In the Fluid-Bed
Gasifier/Modular Gas Cleanup Rig, a fluidized-bed gasifier provides fuel gas
for testing and developing high-temperature, high-pressure components and processes
in a gasification and combustion (reducing and oxidizing) environment. Operated
mainly as a gasifier, the reactor vessel produces coal gas that is tested downstream.
The raw coal gas is sampled for major and trace elements, and is sent to a
filter vessel where particulates are removed.
After particulates are removed, the gas can be transported to any of five
sampling or reaction vessels for fluid-bed desulfurization; transport desulfurization;
chloride, alkali, or other contaminant removal; or recovery processes. The
fluid-bed desulfurizer is used for sorbent regeneration or other oxidation
reaction. Isokinetic sampling of hazardous air pollutants (HAPS) is provided
upstream and downstream of particulate removal.
NETL has the following equipment and diagnostic resources to support these
efforts.
Fluidized-Bed Gasifier
- Diameter: 0.25-m
(10-inch)
- Capacity: 907 kg
(1 ton) coal/day
- Produces up to 227 kg/hr
(300 lb/hr) of coal gas at 1,200 K (1,700°F) and
30 atmospheres (425 psig)
of pressure
Filter Vessel
- Operates at 894 K (1,150°F)
- Operates at 20 atmospheres (300 psig) of pressure
Treatment Vessels
- Fluid-bed desulfurization
- Transport desulfurization
- Chloride removal or recovery
- Alkali removal or recovery
- Removal of other contaminants
Related Diagnostics and Instrumentation
- Sampling systems
- Test modules
For more information contact: T. Robert
McLendon
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