The effect of increased heat integration on the cost for producing DME via black liquor gasification

TL;DRAbstract

Black liquor gasification is currently being developed as an alternative technology for energy and chemical recovery at chemical pulp mills. Substituting the recovery boiler with a black liquor gasification plant coupled to motor fuel production at a future market pulp mill will change the mill’s mass and energy balance from a surplus of both bark and electricity to a deficit. This study investigates the effect, on mass and energy balances and economy, of increased heat integration when a black liquor gasification plant producing DME is introduced to a kraft market pulp mill. By integrating the evaporation plant, the largest steam consumer at a pulp mill, with other parts of the mill and increasing the number of evaporation effects the need for live steam in the evaporation plant can be reduced by more than 50%. As a consequence, the mill’s need for external biomass decreases by 62%. At the same time, however, the need for external electricity increases by 35%. The additional operating

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