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

Source:

Boiler

Revision:

4

Document #:

17.3.1

Class:

> 50 MM BTU/hour Heat Input

Date:

9/22/05

POLLUTANT

BACT
1. Technologically Feasible/ Cost Effective
2. Achieved in Practice

TYPICAL TECHNOLOGY

POC

1. n/d

2. n/s

1. n/d ^f

2. Good Combustion Practice (GCP) ^a

NOx

1.  7 ppmv @ 3% O₂, Dry ^{b, c, d}
2. 9 ppmv @ 3% O₂, Dry ^{a, c, d}

1. Selective Catalytic Reduction (SCR) + Low NO_x Burners (LNB) + Flue Gas Recirculation (FGR) ^{b, c, d}

2. Ultra Low NO_x Burners (ULNB) + FGR ^{a, c, d}

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. 10 ppmv @ 3% O₂ Dry ^f
2. 50 ppmv @ 3% O₂ Dry ^{a, c, e}

1. Oxidation Catalyst ^f

2. Good Combustion Practice in Con-junction with SCR System or Ultra Low NO_x Burners and FGR ^{a, c, e}

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

a. BAAQMD

b. SCAQMD. Cost effectiveness evaluations shall be based on emissions from firing primary fuels but not emergency backup fuels.

c. BACT limits above apply to all fuels except for emergency backup fuel oil used during natural gas curtailment.  For emergency backup fuel oil, BACT(1) for NO_x and CO (achieved using LNB+ FGR+ SCR and GCP) is 25 ppmvd NO_x @ 3% O₂; 100 ppmvd CO @ 3% O_2, and 5 ppmvd NH₃ @ 3% O₂; BACT(2) for NO_x and CO (achieved using ULNB+ FGR and GCP) is 40 ppmvd NO_x @ 3% O₂ and 100 ppmvd CO @ 3% O₂; BACT(2) for SO₂ and PM₁₀ is the use of low sulfur fuel with < 0.05 wt. % S; and BACT(2) for POC is GCP.

d. NO_x determination by Continuous Emission Monitor (3-hour average), or BAAQMD approved equivalent.

e. CO determination by Continuous Emission Monitor (3-hour average), or BAAQMD approved equivalent.

f. The BACT(1) CO limit does not apply to boilers smaller than 250 MM BTU/hour unless an oxidation catalyst is found to be cost effective or is necessary for TBACT or POC Control.