Port Townsend Paper’s Boiler MACT Success Story - Part I: Combustion System Upgrade, 2016 Pulping, Engineering, Environmental, Recycling, Sustainability (PEERS) Conference Proceedings

Port Townsend Paper Corporation (PTPC) operates a biomass-fired boiler called the No. 10 Hog Fuel Boiler (HFB) at its paper mill in Port Townsend, Washington. The boiler was designed to generate up to 250,000 lb/hr of steam while firing biomass derived fuels on a traveling grate. In addition to biomass, the boiler can also fire reprocessed fuel oil.

The unit is operated as the mill’s swing boiler and fires a mixture of hog fuel, OCC rejects, urban wood debris, and separated char on the grate along with reprocessed fuel oil (when required) through auxiliary burners to respond to pressure swings in the mill’s main steam header. The unit has been successful in consistently achieving the state mandated nitrogen oxides (NOx) emissions limits. Prior to the implementation of the Industrial, Commercial, and Institutional Boiler Maximum Allowable Control Technology (Boiler MACT) ruling, the unit did not have a carbon monoxide (CO) emissions limit. Operating data showed that typical CO emissions during normal boiler operation were more than 40% higher than required by the Boiler MACT mandated limit. PTPC’s goal was to meet the Boiler MACT compliance requirements for CO emissions without significantly increasing the NOx emissions above historical levels. 

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