 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
GENERAL
MicroEnergy Systems, Inc. (MSI) is the world's leader in micronized solid
fuel development and implementation. MSI is the only organization with a commercial
track record of systems; some of which, now exceed ten years of operation.
Commercial installations include: coal, petroleum coke, activated carbon. Demonstrations have involved biomass and other solid materials.
Applications include: power generation, industrial steam, chemical and industrial processes, and environmental controls systems.
WHAT
IS MICRONIZED COAL?
Micronized coal, is coal ground to micron-sized particle (i.e., average size
about 15 microns, or one-half diameter of a human hair).
A unit weight has about 300 percent more fuel surface area, and almost 600 percent more particles, when compared to conventional pulverized coal.
Therefore, a much smaller-compact flame is produced, more efficient combustion, more complete burnout, lower emissions, and heat liberation rates comparable to oil.
A micronized coal flame is very compact; thus, can potentially be burned in combustion chambers normally used for oil or gas.
TECHNOLOGY
USED
The patented
and proprietary MSI Micronization Mill has no metal-to-metal contact, contrary
to conventional pulverizers which grinds coal between rapidly rotating hard
surfaces.
A MSI Mill consists of a motor, vertically oriented housing, and rotor shaft mounted with several stages of rotor plate and impactor assemblies. The micronization process occurs by:
Solid fuels (lump size or smaller) and air enters top of mill. ·
Particle size reduction caused by impact forces with: rapidly rotating impactors, particle-to-particle contact, and mill wall.
Either an internal or external fan (depending on application) creates down?flow of air.
Down-flow air entrains and progressively drags particles to each next lower stage level, for ensuing size reduction.
Unique internal classification detains oversized particles until micron-sizing is attained.
At lowest stage, entrained mixture of air and micronized fuel exits mill and is piped directly to a burner for combustion, or to other applications.
MICRONIZE
OTHER FUELS?
In addition to coal, other solid fuels can be micronized including: petroleum
coke, activated carbon, biomass, and other solid materials.
ADVANTAGES
Compared
to conventional coal, advantages of micronized coal include:
Requires less excess combustion air; which coupled with low-NOx burners, can yield lower NOx emissions.
Achieves more complete carbon burnout; thus, lower carbon monoxide (CO) emissions in addition to higher combustion efficiencies.
Faster ignition, produces smaller-compact flame; thus, allows burning in smaller combustion chambers, such as horizontally-mounted package boilers normally utilized for oil firing. Likewise, suitable for retrofit to existing stoker or pulverized coal boilers.
"Tighter" ratios of fuel-to-combustion air can be achieved over a wider turndown range, while maintaining high combustion efficiencies.
Calcium based sorbents (e.g., limestone, dolomite) can be added during micronization process to yield a mixture; that when burned, can achieve reduced sulfur dioxide (SOx) air emissions.
Because of its very low carbon content and micron-sized particles, micronized coal ash can produce an additional environmental benefit in the form of a very desirable recyclable feedstock for use in the production of super-strength concrete.
