Application Book: Heating Solutions for All Industries | Page 72
CONDENSATION PREVENTION
FLY ASH HOPPER HEATING FOR POWER GENERATION
An exceptional way to prevent condensation in fly ash hoppers
Application
Power plants that use waste-to-energy and coal-burning to generate electricity
create a by-product called “fly ash”. Fly ash is a collection of fine particles that are
produced from the combustion process. These fly ash particles are considered to be a
hazardous waste, therefore they must be collected so that they are not able to escape
into the atmosphere. A system of electrostatic precipitators and filtration systems with
large metal hoppers extract the fly ash from the flue gas as it exits the system.
The temperature difference between the hot air inside the hopper and the cool air
outside of the hopper causes condensation to form on the inside walls of the hopper.
This allows the fly ash to stick to the walls and solidify into a concrete-like material. If
not treated, the fly ash will eventually bridge the hopper walls and cause significant
blockage that results in extended periods of downtime and expensive repairs.
Solutions
Silicone rubber hopper heaters create a temperature equilibrium that virtually
eliminates the possibility of condensation from occurring. These heaters provide the
best surface contact because they adhere to hopper walls and lay flat. They have an
extremely low profile to avoid obstructions, are easy to install, extremely durable, and
vibration resistant.
Metal clad heaters are available for higher temperature systems requiring up to
1000°F (538°C). Metal clad heaters meet all IEEE standards.
The TC4000 or MPC2 temperature controllers are two options for controlling these
heaters.
Additional Uses
Metal-clad and silicone rubber heaters can also be used on most any tank or vessel
to prevent condensation or protect against freezing.
Types of Users Industries
Design Engineer
Facilities Maintenance Personnel
Plant Manager Power Generation
Waste-to-Energy Power Generation
FLUE GAS
FLUE GAS
HEATED
AREA
HEATED
AREA
BAGHOUSE
68
HOPPER
HOPPER
PRECIPITATOR
TC4000
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