Effects of integrating a bioethanol production process to a kraft pulp mill

2010 ◽  
Vol 25 (2) ◽  
pp. 233-242 ◽  
Author(s):  
Jesse Kautto ◽  
Kaj Henricson ◽  
Herbert Sixta ◽  
Mikaela Trogen ◽  
Raimo Alén
Keyword(s):  
Production Process ◽  
Ethanol Production ◽  
Kraft Pulp ◽  
Black Liquor ◽  
Pulp Mill ◽  
Simulation Software ◽  
Kraft Pulp Mill ◽  
Excess Power ◽  
Energy Balances ◽  
Wood Consumption

Abstract The integration of an ethanol production process based on prehydrolysis of softwood chips to a kraft pulp mill is discussed. A simulation model of this biorefinery has been created with WinGEMS simulation software to calculate the mass and energy balances of the biorefinery and to examine the effects of the integration on the operation of the pulp mill. Integrating the prehydrolysis process to the modeled pulp mill producing 1000 Adt/day of pine pulp would increase the wood consumption by 16%. With the increased wood consumption, 40 t/day of ethanol could be produced, and the excess power production could be increased by 460 MWh/day. The integration of the ethanol production process to a pulp mill would have considerable effects on the operation of the pulp mill. The coupling of hydrolyzate evaporation with black liquor evaporation would require major modifications in the evaporation plant. Due to the burning of organic residue from the ethanol process and to the increase in the heating value of black liquor, the load on the recovery boiler would increase by 31%.

scholarly journals Consequences in a softwood kraft pulp mill of initial high alkali concentration in the impregnation stage

2019 ◽  
Vol 34 (1) ◽  
pp. 28-35 ◽  
Author(s):  
Elisabet Brännvall ◽  
Ida Kulander
Keyword(s):  
Kraft Pulp ◽  
Pulp Mill ◽  
Alkali Concentration ◽  
Pulp Yield ◽  
Kraft Pulp Mill ◽  
White Liquor ◽  
High Initial Concentration ◽  
Softwood Kraft Pulp ◽  
High Alkali ◽  
Energy Balances

Abstract Impregnation with high initial concentration is fast and efficient, leading to a homogeneous delignification in the subsequent cook, resulting in improved screened pulp yield. To obtain high initial alkali concentration, the white liquor flow needs to be significantly increased. The moisture content of the wood chips and the alkali concentration of the white liquor limit the initial alkali concentration of the impregnation liquor that can be reached. It is therefore of interest to evaluate the possibility to implement high alkali impregnation (HAI) industrially and the consequences this would have on the mill system. The effect of HAI on mass and energy balances in a kraft pulp mill has been studied using mill model simulations. The sensitivity to disturbances in important parameters for process control has been compared to impregnation scenarios used industrially. It was shown that high initial alkali concentration can be achieved on industrial scale by increased white liquor flow. HAI has a positive effect on recovery flows and reduces the need for make-up chemicals. The HAI concept is less sensitive to variations in process parameters, such as chip moisture and white liquor concentration, thus diminishing the risk of alkali depletion in chip cores.

Green Liquor Pretreatment of Mixed Hardwood for Ethanol Production in a Repurposed Kraft Pulp Mill

2010 ◽  
Vol 30 (1) ◽  
pp. 86-104 ◽  
Author(s):  
Yongcan Jin ◽  
Hasan Jameel ◽  
Hou-min Chang ◽  
Richard Phillips
Keyword(s):  
Ethanol Production ◽  
Kraft Pulp ◽  
Pulp Mill ◽  
Kraft Pulp Mill ◽  
Green Liquor

Economics of Ethanol Production in a Repurposed Kraft Pulp Mill

2014 ◽  
Vol 68 (1) ◽  
pp. 49-53
Author(s):  
Yoshikazu Ninomiya ◽  
Richard Phillips ◽  
Hasan Jameel ◽  
Hou-min Chang
Keyword(s):  
Ethanol Production ◽  
Kraft Pulp ◽  
Pulp Mill ◽  
Kraft Pulp Mill

Biological Post-Treatment of Anaerobically-Treated Black Liquor Spills from Kraft Pulp-Mill

2020 ◽  
pp. 493-503
Author(s):  
C. Estrada-Vázquez ◽  
R. Hernández-Vera ◽  
I. Magaña-Plaza ◽  
A. Hernández-González ◽  
H. M. Poggi-Varaldo ◽  
...  
Keyword(s):  
Kraft Pulp ◽  
Black Liquor ◽  
Pulp Mill ◽  
Post Treatment ◽  
Kraft Pulp Mill

scholarly journals Effect of polysulfide pulping process on the energy balance of softwood and hardwood kraft pulp mills

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Satu Lipiäinen ◽  
Katja Kuparinen ◽  
Esa Vakkilainen
Keyword(s):  
Kraft Pulp ◽  
Energy Use ◽  
Process Development ◽  
Black Liquor ◽  
Pulp Mill ◽  
Electricity Production ◽  
Pulp Yield ◽  
Pulp Mills ◽  
Kraft Pulp Mill ◽  
Kraft Pulp Mills

Abstract Polysulfide pulping is a method to increase the pulp yield in a kraft pulp mill. Higher production is in the core of pulp mill process development, but modifications in cooking raise questions on their effects on the other parts of the process. This study focuses on the impacts of polysulfide pulping on the energy use and production of kraft pulp mills. The impacts are estimated by calculating and analyzing the steam and electricity balances of reference softwood and hardwood mills. Energy generation using residual biomass is an essential part of the operation of a kraft pulp mill, and often a notable source of income. The results show that implementation of polysulfide cooking affects both energy consumption and production. Higher hemicelluloses content of pulp cooked using polysulfide liquor means that less organic material ends up in the black liquor. Subsequently, the recovery boiler energy production suffers. The reduced steam production together with increased steam consumption decreased electricity production, corresponding to a decline in sellable electricity of 22.4 % in the hardwood mill and 28.4 % in the softwood mill. The study shows that increasing the pulp production by investing in polysulfide cooking in stand-alone kraft pulp mills can be economically feasible.

Modeling of the Solubility of Different Inorganic Sodium Salts in Black Liquor Under Varying Conditions

TAPPI Journal ◽  
2009 ◽  
Vol 8 (3) ◽  
pp. 9-13 ◽  
Author(s):  
RICKARD WADSBORN ◽  
RUNE RÅDESTRÖM
Keyword(s):  
Ionic Strength ◽  
Kraft Pulp ◽  
Black Liquor ◽  
Pulp Mill ◽  
High Ionic Strength ◽  
Chemical Model ◽  
Interaction Theory ◽  
Sodium Salts ◽  
Kraft Pulp Mill

To create a model for predicting the solubility of burkeite and related sodium salts in the evaporation train of a kraft pulp mill, we conducted experiments covering the precipitation of burkeite (Na2CO3·2Na2SO4) and dicarbonate (2Na2CO3·Na2SO4). Results from the experiments were implemented in a chemical model that used the Pitzer ion-interaction theory to describe the activity factors of the constituting ions in solution at high ionic strength.

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