Current through Register Vol. 49, No. 13, September 23, 2024
Subpart 1.
Wet collectors.
Where an owner or operator deems that the use of fabric
filter installations for operations subject to parts
7011.9922, subparts
1 and
2 and 7011.9923, subpart
2 would create a fire or
explosive hazard, application for approval to use wet collectors shall be made
to the commissioner. Such application shall include sufficient information to
demonstrate that fabric filters cannot be used. The commissioner shall
authorize the use of wet collectors if the commissioner determines that fabric
filters cannot be used.
Wet collectors must be operated with a unit contacting energy
of not less than 40 inches water gage. Unit contacting energy is the sum of the
gas static pressure head decrease across the contact chamber of the collector,
the energy per unit weight of gas handled which is required to introduce
scrubbing liquid into the contact chamber, and the shaft energy per unit weight
of gas handled which is applied to effect contact between the scrubbing liquid
and the gas stream. No bypass devices are permitted.
Wet collectors do not meet the requirements of this subpart
if either of the following conditions exist:
A. leakage of gases, containing particulate
matter, from the control system prior to passage through the wet collector;
or
B. operation at a gas static
pressure head decrease, a scrubbing medium flow rate, or a mechanical energy
level less than specified by the manufacturer for optimum collection
efficiency.
Subp. 2.
Other control equipment.
Compliance with any applicable provision of parts
7011.9921 to
7011.9927 which refers to a
control equipment specification shall be demonstrated in accordance with this
part if the referenced control equipment is not used.
A. The owner or operator of the emissions
unit, or vendor of emission control equipment, shall make available to the
commissioner sufficient information as may be required to demonstrate that the
substitute equipment will provide the degree of emission control which, in the
judgment of the commissioner, is at least as stringent as that which would be
achieved by using the equipment specified in the applicable standard. To the
maximum extent practicable, the determination of equivalent degree of emission
control will be based upon operation at the actual conditions at which the
substitute device is, or will be, operated on the emissions unit. Factors which
will be considered include, but are not limited to, total mass collection
efficiency, collection efficiency versus particle size reliability, and
maintenance practices associated with proper operation of the substitute
device. The method used to determine the total mass collection efficiency and
particle size distribution must be approved by the commissioner.
B. The owner or operator of the emissions
unit, or vendor of emission control equipment, shall submit to the commissioner
performance data including, but not limited to, total mass collection
efficiency and collection efficiency versus particle size of the substitute
control device under actual operating conditions which are representative of
those of the existing or planned operating conditions.
C. In cases for which it is not reasonable,
in the judgment of the commissioner, to require an owner or operator, or vendor
of emission control equipment, to submit performance data which are based upon
actual operating conditions which are representative thereof, the owner or
operator, or vendor of emission control equipment, shall submit to the
commissioner performance data on comparative tests, using subtle standard test
aerosols, of the substitute device and the device specified by the applicable
standard. The performance data shall include, but is not limited to, the total
mass collection efficiency and the collection efficiency versus particle size
of the substitute device and the device specified by the applicable
standard.
Subp. 3.
Collection efficiency of substitute devices for fabric filters.
The total mass collection efficiency of any substitute device
for a fabric filter shall not be less than 99.9 percent.
The total mass collection efficiency of any substitute device
for a wet collector shall not be less than 99.5 percent.
Statutory Authority: MS s
116.07
