Brownstock pulp and associated black liquor is stored in the blowtank after batc

Question

Brownstock pulp and associated black liquor is stored in the blowtank after batch kraft cooking. From the blow tank it is pumpe at 12% consistncy to a diffuser washer(Modified norden equal to 5) followed by a vaccum drum washer(modified norden equal to 3). The dilution factor for the washing operation is 2kg fresh water per kg of dry pulp. The pulp and wash liquor move countercurrently in three washers. after the drum washer the pulp becomes part of the countercurrently flowing wash water.

Calculate the washing efficiency E in % for the total washing operation using the formula below which is valid for 12% pulp consistency throughout the washing system:

E=100(1-.(1364(DF))/(1+.1364(DF)N+1-1)

N- total number of mixing stages

DF- net amount of water added(kg/kg pulp)

Explanation / Answer

N=5+3+3=11

DF= 2

E = (1-0.1364 * 2)

--------------------------- * 100

(1+0.1364* 2)11+1 - 1

E =0.47*100

E = 47%

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