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The system of back up power supply
including standy Gensets and Dynamic UPS of the
high tech. industry located in the region of Great China,
need to be tested
on the weekly basis and running the diesel engine without any loading for
15-20 minutes, to ensure the back up power system is always
in standby and good shape. The exhaust temperature of diesel
engine is around 180-230℃
during the weekly test run of Gensets or Dynamic UPS, this
special operation pattern of Standby Gensets and Dynamic UPS
of running engine without load has made the De-NOx process
of SCR (Selective Catalytic Recovery) for abating NOx become
very difficult due to low exhaust temperature.
The chemical reaction of「SCR
De-NOx System」for
abating NOx, can only be taken place when the
exhaust temperature over 250℃.
If the exhaust temperature is less than 205℃,
problems of SCR catalyst listed as below will jeopardize「SCR
De-NOx System」.
(1) The reacted Ammonia from Urea Solution in contacting
with Sulfur of exhaust at low exhaust temperature will form
Ammonia Salt, such as Ammonia Bisulfate or Ammonia Hydrogen
Sulfate.
(2)
SCR catalyst will be built up by and clogged with
Ammonia Salt, which cannot be cleaned, further more, the
life time of SCR catalyst will be reduced dramatically.
The world class「De-NOx
Grade Engine Exhaust Aftertreatment System」supplied
by Trivision, a special heating device is designed, to heat
up low temperature exhaust up to 250℃,
and abating NOx effectively while the standby Gensets or
Dynamic UPS weekly test run being carried out without any
engine load. This outstanding system design, not only
overcome difficulty of NOx abatement at low exhaust
temperature, but also resolve problems of Ammonia Salt build
up inside SCR catalyst, that allow service life of SCR
catalyst can also been maintained.
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