BAY AREA AIR QUALITY MANAGEMENT DISTRICT
Best Available Control Technology (BACT) Guideline

Source Category

Source: Boiler Revision: 3
Document #: 17.1.1
Class: 5 MMBtu/hr to <33.5 MMBtu/hr Heat Input Date: 05/13/98

Determination

POLLUTANT

 BACT
1. Technologically Feasible/ Cost Effective
2. Achieved in Practice		 TYPICAL TECHNOLOGY
POC 1. n/d
2. n/s		 1. n/d
2. Good Combustion Practicea
NOx 1.  20 ppmv @ 3% O2 Dry a,b,d

2. 20 ppmv @ 3% O2 Dry, for Firetube Boilers 25 ppmv @ 3% O2 Dry,  for Watertube Boilers a,c,d		 1. Low NOx Burners + Flue Gas Recirculationa
2. Low NOx Burners + Flue Gas Recirculationa
SO2 1. Natural Gas or Treated Refinery Gas Fuel w/ <.50 ppmv Hydrogen Sulfide and <100 ppmv Total Reduced Sulfur a,c
2. Natural Gas or Treated Refinery Gas Fuel w/ <100 ppmv Total Reduced Sulfur a,c		 1. Fuel Selection a,c


2. Fuel Selection a,c
CO 1. 50 ppmv @ 3% O2 Dry a,c,e
2.  50 ppmv @ 3% O2 Dry, for Firetube Boilersf 100 ppmv @ 3% O2 Dry,  for Watertube Boilers a,c,e		 1. Good Combustion Practice a,c
2. Good Combustion Practice a,c
PM10 1. n/d
2. Natural Gas or Treated Refinery Gas Fuel a,c		 1.  n/d
2.  Fuel Selection a,c
NPOC 1. n/a
2. n/a		 1. n/a
2. n/a

References

a. BAAQMD
b. Demonstrated for firetube boilers
c. BACT is 25 ppmvd NOx @ 3% O2 and 50/100 ppmvd CO @ 3 % O2 regardless of fuel.  However, emergency backup fuel oil w/ < 0.05 wt. % sulfur may be permitted to emit up to 60 NOx ppmvd @ 3% O2 and 100 ppmvd CO @ 3 % O2 during natural gas curtailment.
d. NOx  determination by BAAQMD source Test method ST-13A or B (average of three 30-minute sampling runs), or BAAQMD approved equivalent.
e. CO determination by BAAQMD Source Test Method ST-6 (average of three 30 minute sampling runs), or BAAQMD approved equivalent.
f. CO 100 ppmv allowance for firetube boilers meeting the 20 ppmv NOx standard.