New Learnings and Strategies for Meeting Future Recovery Boiler Particulate Emission Limits with Existing Electrostatic Precipitators, 20PEERS Conference

In the USA, the EPA mandates that existing recovery boiler particulate emissions must not exceed 0.044 gr/dscf @ 8% O2, and new or rebuilt furnace emissions must not exceed 0.015 gr/dscf @ 8% O2 [1]. Similarly, in Canada, the recommendations in the Code of Practice for Management of Air Emissions from Pulp and Paper Facilities issued by Environment and Climate Change Canada recommend that total particulate emissions should be less than 2 kg of PM/tonne of production, and local point of impingement requirements generally result in stack emissions <100 mg/Nm3.  In both the USA and Canada, opacity is generally limited to 20%, and (depending on stack geometry) this can sometimes be the critical parameter driving the need for higher electrostatic precipitator (ESP) efficiency as it corresponds to a concentration lower than the aforementioned limits. It is foreseeable that emission limits will continue to get more stringent with time. Because of this, continued improvement of emission control equipment as well as a better understanding of how operating parameters affect performance are necessary. This paper discusses how recovery boiler and ESP operating factors affect ESP performance based on process simulations and practical experience, and how these learnings can be implemented to improve future operation of existing ESPs.  

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