Branch Environmental can provide several different technologies for removing
oxides of nitrogen (NOx) from air or flue gas. The best treatment method for
your application will depend on the conditions of operation.
Selective Catalytic Reduction
SCR systems use our catalytic design to react ammonia injected into the air
stream with the NOx present. This approach requires an operating
temperature of 320-700º F (160-320º C) depending on the catalyst used.
flue gas that is already in this range, the SCR
system will be a good choice. Systems use about
.4 wt. NH3/wt. NOx .
Because there are so many variables, please
contact us for specific information.
Wet Phase Catalyst
To avoid the problem of high chemical cost, a special surface catalyst media was
developed to be used at ambient temperatures. This unit uses conventional
scrubber chemistry with a caustic solution, operates at ambient temperature, and
can handle variable loads.
This surface catalyst is relatively expensive
initially, so the best choice will depend on
concentration of NOx, temperature, required
The lowest initial cost system will be a wet scrubber. However, as
NOx absorbs in water, it
reacts to form NO
(insoluble form) which will slowly reoxidize to
NO2. In a conventional
scrubber, 60-70% removal occurs. To improve this, several possible chemicals can
be introduced into the towers combined with a very long contact time.
The disadvantage of this approach is the cost
of the special chemicals required. Additionally,
there will be a waste water treatment
Contact us for more details on any specific project.
- All performance levels are guaranteed.
- Complete engineered systems available.
- All safety standards such as FM, UL... can
- Can be combined with our other systems to
handle multiple gas removal.