Fiberline systems, processes and methods

Abstract

A chemical pulp mill system and method of using black liquor flashing steam from a digester system comprises generating black liquor in the digester system, sending the black liquor to an evaporator system without using any pre-evaporator system, flashing the black liquor in the evaporator system to yield steam, and using at least some of the steam for chip steaming in a chip bin and/or for supplying in-direct heat exchangers in the digester system for pre-heating white liquor and/or filtrates for use in the digester system. In other embodiments, a chemical pulp mill system and method for utilizing black liquor flashing steam from a digester system comprises generating black liquor from the digester system, flashing the black liquor in one stage to yield steam prior to leading the black liquor into an evaporation system storage tank, using the steam to steam chips and/or evaporate black liquor in the evaporation system, and preventing formation of concentrated non-condensable gases and foul condensate in the digester system by using the digester system without any condenser for the black liquor flashing steam.

1 - 8 . (canceled) 
     
     
         9 . A chemical pulp milt system comprising:
 (a) a digester system that can generate black liquor,   (b) an evaporator system,   wherein the chemical pulp mill system has no pre-evaporator system, and   wherein black liquor can be flashed in the evaporator system to yield steam, and at least some of the steam can be used for chip steaming in a chip bin and/or for supplying in-direct heat exchangers in the digester system for pre-heating white liquor and/or filtrates for use in the digester system.   
     
     
         10 . A system according to  claim 9  further comprising a pressurized fiber filter between the digester system and the evaporator system. 
     
     
         11 . A system according to  claim 10  wherein the filter can allow the removal of fiber from a black liquor stream to a level of about 40 ppm leaving the filter. 
     
     
         12 . A system according to  claim 9  wherein the evaporator system comprises a multi-effect evaporator having at least six effects. 
     
     
         13 . A system according to  claim 9  wherein the evaporator system comprises a multi-effect evaporator having six effects. 
     
     
         14 . A system according to  claim 9  comprising two or more digesters. 
     
     
         15 - 19 . (canceled) 
     
     
         20 . A chemical pulp mill system comprising:
 (a) a digester system that can generate black liquor,   (b) a flash tank for flashing the black liquor to yield steam, and   wherein the system does not have any condenser for the black liquor flashing steam yet the system is capable of preventing the formation of concentrated non-condensable gases and foul condensate in the digester system.   
     
     
         21 . A system according to  claim 20  that further comprises an evaporator system having a multi-effect evaporator with at least six effects. 
     
     
         22 . A system according to  claim 20  that further comprises a black liquor cooler after the flash tank. 
     
     
         23 . A system according to  claim 20  that further comprises at least one flow controller after the flash tank. 
     
     
         24 . A system according to  claim 22  that further comprises a flow controller after the cooler.