FACTORS AFFECTING PARTICULATE REMOVAL EFFICIENCY OF KRAFT RECOVERY BOILER ELECTROSTATIC PRECIPITATORS - A TECHNICAL REVIEW, 2017PEERS

Electrostatic precipitators (ESP) are used in most pulp mills to remove particulate from recovery boilers, power boilers, and lime kilns. As environmental regulations have increasingly become stringent in recent years, maintaining a high ESP performance is of vital importance in mill operation. This paper discusses results of a literature review of the ESP technology used in industrial combustion units including recovery boilers, and results of a parametric study using the well-known Deutsch-Anderson equation to correlate recovery boiler operating conditions with ESP collection efficiency. The results show that for particles up to about 0.3 μm, the ESP collection efficiency decreases drastically with increased particle size and with decreased temperature. For particles larger than 0.5 μm, however, the trend reverses; the collection efficiency increases with increased particle size and decreased temperature. The results also suggest that that the particle concentration (or loading) in the flue gas has no effect on collection efficiency, and that NaCl particles are more readily captured than for Na2SO4 particles. The latter prediction, however, appears to be in contradiction with mill experience that NaCl particles are more difficult to capture. To test the validity of the findings of the parametric study, a bench scale experimental apparatus is being built to further investigate the effects of particle composition and various ESP operating conditions on ESP collection efficiency. 

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