DeNox decisively classified options for coal, cement, incineration

Option

*

 Details

SCR

E

Ammonia injection followed by a catalytic reactor

A

High efficiency and accepted by regulatory authorities

D

Cost, catalyst plugging, space

SNCR

E

Urea injection in the furnace

A

Low cost, low maintenance, space

D

Low efficiency, ammonia slip

Ozone

Oxidation

E

 Ozone injection followed by scrubber

A

Little space if scrubber already in place

D

Ozone cost, efficiency

Hydrogen

Peroxide

E

Chemical injection converts to NO2 followed by scrubbing

A

Low capital cost if scrubber already in place

D

Chemical cost,

Catalytic

Filter

E

Fabric filter has embedded catalyst

A

Lower foot print with combination, lower capital and operating cost

D

Lack of experience

 *  E= explanation,    A=advantages       D=disadvantages