PROCESS AIR HEATER
Indirect and Direct Heaters
TT BOILERS, type INDIRECT
Process air heater can
also be delivered as indirect heaters in which a combustion chamber with
a burner is equipped also with a heat exchanger that transfer the heat
from the combustion gasses to the clean process air.
Combustion Gas - to - Process air heat exchanger (indirect process air heater). This units has a capacity of 120,000 Nm³/h process air @ 650°C installed at Sam Nam, Korea and Bakrei Kasei, Indonesia. Read more about gas-to-gas heat exchangers.
These direct and indirect heating of process air are alternatives to numerous other ways to heat up process air (using, steam, thermal oil, electrical heating etc) by process air heaters.
TT BOILERS, type DIRECT
The most efficient and
cheapest way to heat up air / gas is to have the flame of a burner in
the air/gas stream. This direct heating means that the combustion
exhaust gas is mixed with the air/gas. With this direct heating you will
be able to achieve very high temperature on the air/gas. However in
certain applications this cannot be allowed.