NOx Removal

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.

For flue gas that is already in this range, the SCR system will be a good choice.

Systems use about 1.5wt. NH3/wt.NOx .

Because there are so many variables, please contact us for specific information.

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 requirement.

To decide if wet scrubbing is right for you, please contact us.

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 efficiency...

We can give you more details for any specific project.