Recovery boiler mass and energy balances are needed for performance testing of recovery boilers, mill energy wide control systems and in calculating air emission data. Typically recovery boiler balances are mainly based on 1996 TAPPI publication "Performance Test Procedure: Sodium Base Recovery Units". The use of which is problematic in Europe because of its view that losses from recovery of process chemicals are counted when determining the recovery boiler steam generation efficiency. Low efficiency leads to taxation and legislative problems in some European countries.There is newly accepted European standard for steam generator acceptance tests EN 12952-15:2003 "Water-tube boilers and auxiliary installations - Part 15: Acceptance tests". This paper examines how this can be applied to recovery boilers to find out net efficiency which is show to be approximately same than for other biomass boilers, not 10 % lower.In the paper new, more accurate method to calculate losses from convection and conduction is discussed. In addition, a suggestion of how to handle borate autocausticization in the recovery boiler furnace is made.
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