method to slutindunsta black liquor in several steps where it is kept in the series through the steps and primärånga added to each step

摘要

PCT No. PCT/SE95/00991 Sec. 371 Date Jun. 27, 1997 Sec. 102(e) Date Jun. 27, 1997 PCT Filed Sep. 5, 1995 PCT Pub. No. WO96/12848 PCT Pub. Date May 2, 1996The process for the final evaporation has at least two evaporation appliances. These appliances are coupled in series with respect to the black liquor and in parallel with the live steam (primary steam), which drives the evaporation, and with the secondary steam that is generated by the evaporation. The pressure of the primary steam that is supplied to the appliance(s) where the liquor concentration is at the highest concentration is greater than the pressure of the primary steam supplied to the other appliances where the liquor concentration is not so high.