Aqueous Ammonia System Sample Clauses

Aqueous Ammonia System. The OTSG SCR system shall be designed to operate with 19% by weight aqueous ammonia. The system shall use an electric heater with redundant carrier fans to vaporize the ammonia. An ammonia storage tank area shall be provided with an ammonia gas leakage monitoring system. The leakage monitoring system shall be designed to detect ammonia gas leakage and alarm locally by audible and visual means as well as in the PCR through the DCS. All tank and pump controls shall be controlled by the DCS from the PCR. Continuous emissions monitoring of the nitrogen oxides (NOx) and calculated ammonia (NH3) slip shall be provided on each exhaust stack via the CEMS. Continuous emissions monitoring of NOx shall also be provided upstream of the SCR catalyst on each unit to determine NOx reduction efficiency. The CEMS shall be configured to report NOx emissions in measurement units of parts per million (ppm), ppmvd corrected to 15% O2, pounds per million Btu (lb/MMBtu), and pounds per hour (lb/hr). The lb/hr emission rate calculations shall be calculated using readings from the natural gas fuel meter. The calculated ammonia slip values will be reported in measurement units of ppm and lb/hr as well. All of the natural gas combustion systems will have individual metering systems downstream of the gas compressors with the appropriate accuracy in accordance with the air permitting requirements. The fuel meters supplied with the GE Packaged Power CTGs shall be considered to meet the metering requirements for the CTGs. Duct burners will be supplied with fuel meters that provide outputs to both the CEMS and the Plant DCS. The thermal process heater will have a fuel meter which also supplies outputs to both the CEMS and the Plant DCS. The total Plant natural gas usage will be monitored using a custody check meter skid, complete with temperature, pressure, and flow computer. Calibration shall be to AGA 9 for ultrasonic flow meter. Meter shall have a 20 to 1 turndown capability and an accuracy of +/- 0.5%.