Techno-economic feasibility of supercritical water gasification of black liquor

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • Faculty of Science and Engineering
  • Åbo Akademi University
  • VTT Technical Research Centre of Finland

Abstract

The objective of this study is to investigate the techno-economic feasibility of supercritical water gasification (SCWG) of black liquor integrated to a Kraft pulp mill. The process simulations have been performed through Aspen Plus software. The assessment includes five integration scenarios: stainless steel 316 or Inconel 625 as the reactor materials and hydrogen or combined heat and power (CHP) as the target products. The results illustrates that Inconel reactor is more profitable for CHP production than stainless steel as well as providing lower production cost of hydrogen. Inconel is also more robust against loss of pulping chemicals and changes in the energy price. However, the assessment uses the experimental yields even though surface-to-volume ratio of the reactor will reduce in the industrial scale. Therefore, the results should be validated in pilot scale as well before implementation. Nevertheless, a special reactor configuration can increase surface area. The techno-economic results can be improved by comprehensive investigations of process conditions including also residence time, the concentration of reactor inlet and heterogeneous catalyst. In addition, the SCWG process integrated to a pulp mill can also receive feedstocks from other biomass sectors. This would improve the economic and environmental performances of those sectors as well.

Details

Original languageEnglish
Article number116284
JournalEnergy
Publication statusAccepted/In press - 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • Black liquor, Feasibility, Hydrogen production, Integrated biorefinery, Process simulation, Supercritical water gasification, Techno-economic assessment

ID: 37945052