Speakers' Corner

Pulp&Fuel workshop: Integration of gasification and hydrothermal technologies in the pulp and paper industry

29 April 2021 | 16:00 -18:00 CEST


16:00 – 16:05 | Introduction
Moderator Marine PEYROT (CEA)

16:05 – 16:20 | New challenges for the pulp industry

16:20 – 16:25 | Short description of the Pulp&Fuel project

16:25 – 16:30 | Short description of the BL2F project

16:30 – 17:05 | Integration of gasification and supercritical water gasification technologies in the pulp mill industry – dry and hydrothermal processes, process design, Pulp mill integration, systems analysis & optimization
Pulp&Fuel (Pulp&Fuel partners, several speakers)

  • From TAU
    • Tero Joronen
  • From IVL
    • Sofia Poulikidou
  • From EPFL
    • Julian Granacher
  • From SINTEF
    • Bjørn Christian Enger
  • From Fibre Excellence
    • Jérémy Boucher
  • From CEA
    • Geert Haarlemmer
    • Marine Peyrot

17:05 – 17:25 | Transforming black liquor to biofuel

17:25 – 17:55 | Open discussion and Round table
Moderator Marine PEYROT (CEA)

17:55 – 18:00 | Resume and Conclusions


The objective of this workshop is to highlight the challenges and the new advances of the biorefinery concepts developed in the projects. It will show how gasification and hydrothermal technologies can be included in the paper pulp production cycle.

Today bark combustion produces much of the heat required on the pulp plant. Lignin is separated from the cellulose and contained in the black liquor together with the cooking chemicals. This lignin is burned in the recovery boiler, producing more heat in the process. Most pulp plants have an excess heat production. The project proposes to reduce this carbon rejection and transform a part of the excess energy and carbon in liquid transport fuels.

Gasification of dry resources in a fixed bed or entrained flow gasifier is well established for coal, and progressively adapted to biomass. More complex resources such as bark remain a challenge. The challenges include the flowability of the powders and the high ash content.

Black liquor is a resource that is well adapted to hydrothermal processes. Black liquor gasification is proposed in a supercritical water gasifier in the Pulp&Fuel project (http://pulpandfuel.eu/). Pulp&Fuel studies the depolymerisation of black liquor in near supercritical conditions, BL2F in slightly super-critical conditions (http://www.bl2f.eu/).  Hydrothermal processes avoid drying of the resource and supercritical water is an effective reaction medium. Supercritical water technologies are promising but due to the high temperatures and pressures present technological difficulties. The understanding of the behaviour of salts is an important issue that needs addressing. BL2F integrates salt separation to the liquefaction process in super-critical conditions.

The dry and supercritical water gasification techniques produce very different syngas qualities that allow us to configure and optimise a Fischer-Tropsch fuel synthesis that takes advantage of both syngas streams.

The workshop will be opened by an overview of the pulp and paper industry, the Pulp&Fuel and BL2F projects and their technical challenges.

Then, a series of contributions will be focused on scientific results in the projects, including dry and hydrothermal processes, process design, Pulp mill integration, systems analysis & optimization. The participants will learn more on the Kraft and gasification processes and novel process design and integration techniques.

The workshop will end with a panel discussion including a special focus on the possible application of the “biorefinery concept” to other industry than Kraft pulp mill.


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Please note that this Programme may be subject to alteration and the Organisers reserve the right to do so without giving prior notice.