Black Liquor Spraying Orientation Determination in Kraft Recovery Boiler

Abstract
A droplet landing on a proper place in the recovery boiler furnace has always been the target in black liquor
combustion. To reach optimum boiler operation, black liquor droplets should land evenly on the charbed. The target
is also to avoid excess landing on furnace walls and to minimize the amount of carryover. To be able to verify droplet
landing as expected, special time-consuming measuring arrangements have been applied.
A simple method, based on visual imaging, has been developed to estimate the spraying orientation from black liquor
burners. Either smart phones or industrial cameras can be used to record the spray orientation images. The images are
then analyzed by an algorithm, which uses a specially created generic program platform. The algorithm gives the
spraying direction and opening angle of the sprays. Both splash plate and beer can type liquor burners have been tested
in a 3600 tds/d and a 1200 tds/d kraft recovery boiler.
This new method will improve recovery boiler operation by better combustion control and therefore also increase
boiler throughput and availability. Liquor spraying monitoring and control will improve; 1) better charbed control
(height and position), 2) minimized carryover level, 3) higher reduction, 4) even smelt flow, and 5) reduced emissions
from the boiler.

Keywords
Firing liquor, droplet trajectories, visual analysis, recovery boiler

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