A method 1 further comprising a step of condensing the vapor generated during {HEAD ~ the concentration} of the black liquor by using {TAIL ~ water} as a condensing medium, and said water generates steam that is taken to pre heat the combustion air 
by using
A method 1 further comprising a step of condensing the vapor generated during { HEAD ~ the concentration } of the black liquor by using { TAIL ~ water } as a condensing medium , and said water generates steam that is taken to pre heat the combustion air
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH