miles of the sea, salt may be a particular
contaminant that puts turbine performance in peril. While dry salt will be captured in the same way as other dry particulates, the affinity salt has for absorbing
water and moisture means it needs special consideration.
As with other contaminants, salt can
stick to turbine blades and reduce aerodynamic efficiency. Its stickiness, however,
can increase the rate at which this occurs.
Salt is also particularly harmful because,
if allowed into the turbine internals, the
sodium in the salt can combine with sulfur in the fuel in the hot section of the turbine to cause accelerated corrosion. In the
cold end, the chlorine in the salt will additionally act as a pitting corrosion initiator. The overall impact salt can have on a
gas turbine can lead to exceptionally high
maintenance levels and premature failure
of the turbine.
the gas turbines, a filtration solution
needs to handle the local, real-world conditions in which it is installed.
Fine particles that reach the turbine
blades can stick to them and, as they build
up, affect aerodynamic performance.
This will cause a reduction in output
power and increase in heat rate that will
ultimately require an offline wash. The
more frequently this maintenance procedure needs to be carried out, the greater
the cost impact through lost MW output
and increased rates of fuel usage. Filters
use media that captures particulates and
prevents them reaching and harming the
internal parts of the gas turbine. The higher the efficiency of the filter, the finer the
particles it captures.
DOES SALT THREATEN
If a power plant is located within 12
Harsh conditions make filter choices tougher.
HEPA-rated filters will perform differently
depending on design and construction. Make
sure your filter choice is right for your specific
Steve Hiner is chief engineer of Gas
Turbine Inlet Systems at CLARCOR
Operating Data Comparison 1
Turbine operating data can help show how different HEPA filters perform in the same environment.