Regulatory Text: 
§117.601.  Gas-Fired Steam Generation.

(Approved by EPA 03/03/2000 (65 FR 11468) effective 04/03/2000.)

     (a)  Subsections (b), (c), and (d) of this section shall apply only in the Dallas/Fort Worth Air Quality Control Region which consists of Collin, Cooke, Dallas, Denton, Ellis, Erath, Fannin, Grayson, Hood, Hunt, Johnson, Kaufman, Navarro, Palo Pinto, Parker, Rockwall, Somervell, Tarrant, and Wise counties and in the Houston/Galveston Air Quality Control Region which consists of Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston, Harris, Liberty, Matagorda, Montgomery, Waller, and Wharton counties.  For gas-fired steam generators located in applicable ozone nonattainment areas, only the emission limitations of §117.105 of this title (relating to Emission Specifications), §117.107 of this title (relating to Alternative System-Wide Emission Specifications), §117.205 of this title (relating to Emission Specifications), and §117.207 of this title (relating to Alternative Plant-Wide Emission Specifications) shall apply after November 15, 1999.

     (b)  No person shall allow emissions of nitrogen oxides (NO_x), calculated as nitrogen dioxide (NO₂), from any "opposed-fired" steam generating unit of more than 600,000 pounds per hour (lbs/hr) maximum continuous steam capacity to exceed 0.7 pound per million Btu (lb/MMBtu) heat input, maximum two-hour average, at maximum steam capacity.  An "opposed-fired" steam generating unit is defined as a unit having burners installed on two opposite vertical firebox surfaces.

     (c)  No person shall allow emissions of NO_x, calculated as NO₂, from any "front-fired" steam generating unit of more than 600,000 lbs/hr maximum continuous steam capacity to exceed 0.5 lb/MMBtu heat input, maximum two-hour average, at maximum steam capacity.  A "front-fired" steam generating unit is defined as a unit having all burners installed in a geometric array on one vertical firebox surface.

     (d)  No person shall allow emissions of NO_x, calculated as NO₂, from any "tangential-fired" steam generating unit of more than 600,000 lbs/hr maximum continuous steam capacity to exceed 0.25 lb/MMBtu heat input, maximum two-hour average, at maximum steam capacity.  A "tangential-fired" steam generating unit is defined as a unit having burners installed on all corners of the unit at various elevations.

     (e)  Existing gas-fired steam generating units of more than 600,000 lbs/hour, but less than 1,100,000 lbs/hr, maximum continuous steam capacity are exempt from the provisions of this section, provided the total steam generated from the unit during any one calendar year does not exceed 30% of the product of the maximum continuous steam capacity of the unit times the number of hours in a year.  Written records of the amount of steam generated for each day's operation shall be made on a daily basis and maintained for at least three years from the date of each entry.  Such records shall be made available for inspection by employees of state and local agencies having jurisdiction during regular business hours.

As adopted by TNRCC May 20, 1998 effective June 10, 1998

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