Stationary Reciprocating Internal Combustion
Engines (RICE)
MACT Rule
Main : 1 :
2 : 3 : 4
3. Actions Required
The final rule requires that:
- Existing and new 4-stroke rich burn (4SRB) engines
either reduce formaldehyde by 76 percent or limit the
formaldehyde concentration to 350 parts per billion
- New 2-stroke lean burn (2SLB) engines either reduce
carbon monoxide (CO) by 58 percent or limit the formaldehyde
concentration to 12 parts per million
- New 4-stroke lean burn (4SLB) engines either reduce
CO by 93 percent or limit the formaldehyde concentration
to 14 parts per million
- New compression ignition (CI) engines either reduce
CO by 70 percent or limit the formaldehyde concentration
to 580 parts per billion
 Formaldehyde and CO are surrogates for reducing the air toxics
of concern from RICE. Therefore, by reducing formaldehyde
and CO, facilities also will reduce the other air toxics
to similar levels.
EPA expects owners or operators of 4SRB engines to install air pollution control
devices known as Anon-selective catalyst reduction. These systems not only reduce
CO emissions, they also reduce air toxics emissions such as formaldehyde, acrolein,
methanol, and acetaldehyde. Sources are free to comply with either compliance
option, irrespective of the control technique applied.
Owners or operators of 2SLB, 4SLB, and CI engines likely will install devices
known as ACO catalytic oxidation systems to meet the formaldehyde and CO requirements.
The source must conduct the initial performance test or other initial compliance
demonstrations that apply to them within 180 days after the compliance date
that is specified for their stationary RICE.The source must initially comply
with the emission and operating limitations specified for the size of their
RICE.Facilities must comply with continuous emission/operating limits and continuous
stack monitoring or recording of operating parameters. Sources must submit
reports semiannually and/or annually in most cases. Some reports are due within
2 days.
Main : 1 : 2 : 3 : 4
|
