A specialty cellulose provider, Tembec, is upgrading a sulfite pulping mill in Eastern Canada to incorporate a new red liquor recovery boiler for power generation. The boiler system increases annual green energy production by up to 40-megawatts, reduces sulfur dioxide emissions by 70%, and increases annual production capacity of specialty cellulose by 5,000 metric tonnes. The off-gas from the recovery boiler contains a high concentration of SO2 which needs to be recovered for re-use in the production process.
A cost effective solution was needed to recover sulfur and clean the stack gases to meet stringent particulate and SO2 emission limits. The plant is located in a high labor rate area, which makes a field erected system very expensive due to lengthy installation time.
A case study is now available to describe how an Envitech scrubber/wet electrostatic precipitator (WESP) system solves this problem.
Please click on the icon below to download the case study.