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Energy conversion performance of black liquor gasification to hydrogen production using direct causticization with CO2 capture
KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Energiprocesser.
KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Energiprocesser.
School of Sustainable Development of Society and Technology, Mälardalen University, Sweden.
2012 (Engelska)Ingår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 110, s. 637-644Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This paper estimates potential hydrogen production via dry black liquor gasification system with direct causticization integrated with a reference pulp mill. The advantage of using direct causticization is elimination of energy intensive lime kiln. Pressure swing adsorption is integrated in the carbon capture process for hydrogen upgrading. The energy conversion performance of the integrated system is compared with other bio-fuel alternatives and evaluated based on system performance indicators. The results indicated a significant hydrogen production potential (about 141MW) with an energy ratio of about 0.74 from the reference black liquor capacity (about 243.5MW) and extra biomass import (about 50MW) to compensate total energy deficit. About 867,000tonnes of CO2 abatement per year is estimated i.e. combining CO2 capture and CO2 offset from hydrogen replacing motor gasoline. The hydrogen production offers a substantial motor fuel replacement especially in regions with large pulp and paper industry e.g. about 63% of domestic gasoline replacement in Sweden.

Ort, förlag, år, upplaga, sidor
Elsevier, 2012. Vol. 110, s. 637-644
Nyckelord [en]
Bio-fuel, Black liquor gasification, Direct causticization, Hydrogen, Pulp mill
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
URN: urn:nbn:se:kth:diva-50180DOI: 10.1016/j.biortech.2012.01.070ISI: 000305852700090Scopus ID: 2-s2.0-84858276158OAI: oai:DiVA.org:kth-50180DiVA, id: diva2:461213
Anmärkning
QC 20120627Tillgänglig från: 2011-12-02 Skapad: 2011-12-02 Senast uppdaterad: 2017-12-08Bibliografiskt granskad
Ingår i avhandling
1. Analysing performance of bio-refinery systems by integrating black liquor gasification with chemical pulp mills
Öppna denna publikation i ny flik eller fönster >>Analysing performance of bio-refinery systems by integrating black liquor gasification with chemical pulp mills
2012 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Mitigation of climate change and energy security are major driving forces for increased biomass utilization. The pulp and paper industry consumes a large proportion of the biomass worldwide including bark, wood residues, and black liquor. Due to the fact that modern mills have established infrastructure for handling and processing biomass, it is possible to lay foundation for future gasification based bio-refineries to poly-produce electricity, chemicals or bio-fuels together with pulp and paper products. There is a potential to export electricity or bio-fuels by improving energy systems of existing chemical pulp mills by integrating gasification technology.

The present study investigates bio-fuel alternatives from the dry black liquor gasification (BLG) system with direct causticization and direct methane production from the catalytic hydrothermal gasification (CHG) system. The studied systems are compared with bio-fuel alternatives from the Chemrec BLG system and the improvements in the energy systems of the pulp mill are analyzed. The results are used to identify the efficient route based on system performance indicators e.g. material and energy balances to compare BLG systems and the conventional recovery boiler system, potential biofuel production together with biomass to biofuel conversion efficiency, energy ratios, potential CO2 mitigation combining on-site CO2 reduction using CO2 capture and potential CO2 offsets from biofuel use, and potential motor fuel replacement.

The results showed that the dry BLG system for synthetic natural gas (SNG) production offers better integration opportunities with the chemical pulp mill in terms of overall material and energy balances. The biofuel production and conversion efficiency are higher in the CHG system than other studied configurations but at a cost of larger biomass import. The dry BLG system for SNG production achieved high biomass to biofuel efficiency and considerable biofuel production. The energy ratio is significant in the dry BLG (SNG) system with less biomass demand and considerable net steam production in the BLG island. The elimination of the lime kiln in the dry BLG systems resulted in reduced consequences of incremental biomass import and associated CO2 emissions. Hydrogen production in the dry BLG system showed the highest combined CO2 mitigation potential i.e. on-site CO2 capture potential and CO2 offset from biofuel replacing fossil fuel. The results also showed that the motor fuel replacement potential with SNG as compressed natural gas (CNG) replacing gasoline in the transport sector is significantly high in countries with large pulp industry.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2012. s. x, 73
Serie
Trita-CHE-Report, ISSN 1654-1081 ; 2012:16
Nyckelord
Bio-refinery, Biomass, Black liquor gasification, Bio-fuel, Pulp mill, CO2, Conversion efficiency, Integration, Synthesis gas
Nationell ämneskategori
Energiteknik
Identifikatorer
urn:nbn:se:kth:diva-95524 (URN)978-91-7501-319-0 (ISBN)
Disputation
2012-06-08, F3, Lindstedtsvägen 26, Stockholm, 09:00 (Engelska)
Opponent
Handledare
Anmärkning
QC 20120528Tillgänglig från: 2012-05-28 Skapad: 2012-05-28 Senast uppdaterad: 2012-05-28Bibliografiskt granskad

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