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Recovery boiler is the part of kraft process of pulping where chemicals for white liquor are recovered and reformed from black liquor, which contains lignin from previously processed wood. The black liquor is burned, generating heat, which is usually used in the process of making electricity, much as in a conventional steam power plant .
The Chemrec process for gasification of black liquor from the chemical pulp industry offers to increase the yield of high-value energy products from 15 to 16% in modern recovery boilers to 22–23% for the BLG electricity concept (BLGCC) or to 55% for the BLG bio fuel concept (BLGMF), with 90+% green-house gas reduction.
Early kraft pulp mills discharged black liquor to watercourses. Black liquor is quite toxic to aquatic life, and causes a very dark caramel color in the water. The invention of the recovery boiler by G.H. Tomlinson in the early 1930s was a milestone in the advancement of the kraft process. [7]
The weak black liquor is further evaporated to 65% or even 80% solids ("heavy black liquor" [10]) and burned in the recovery boiler to recover the inorganic chemicals for reuse in the pulping process. Higher solids in the concentrated black liquor increases the energy and chemical efficiency of the recovery cycle, but also gives higher ...
The extracted liquid, known as black liquor in the kraft process, and red or brown liquor in the sulfite processes, is concentrated, burned and the sodium and sulfur compounds recycled in the recovery process. Lignosulphonates is a useful byproduct recovered from the spent liquor in the sulfite process. [9]
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The recovery process used in magnesium-based sulfite pulping the "Magnefite" process is well developed. [8] The concentrated brown liquor is burned in a recovery boiler, producing magnesium oxide and sulfur dioxide, both of which are recovered from the flue gases.
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