Figure: 30 TAC §117.1310(a)(1)(D)(ii)

The equation for calculating the system-wide heat input weighted average NOx emission rate for utility boilers in large utility systems

Where:

Eavg           =          system-wide heat input weighted average NOX emission rate, lb/MMBtu;

Ei              =          hourly average NOX emission rate for utility boiler i, lb/MMBtu;

i                =          each utility boiler in the system;

N              =          the total number of utility boilers in the system; and

Hi             =          hourly average heat input for utility boiler i, MMBtu/hr.