1. Fossil free tissue drying
Lars Nilsson Karlstad University One possible industrial application of biomass gasification for the pulp and paper industry

2. Source: www.skogsindustrierna.org

3. Tissue products - Toilet paper - Kitchen towels - Napkins - Facials
- ……….

4. Tissue drying process Condensing steam inside the cylinder
Impinging hot gases

5. Research questions Is gasification technology commercially available?
Will the need for energy gas increase?
Effects of process integration?

6. Scale of the gasification plant
Machine speed m/min
Machine width m
Grammage g/m2
Press dryness %
Creping dryness %
Specific drying energy 3,0 MJ/kg H2O
Impingement drying contribution 50 %
Gas production roughly 2 MW
GoBiGas 20 MW (demo) and 100 MW (full scale)

7. Proposed gasification technologies
Updraft fixed bed Downdraft fixed bed
Not OK! OK!

8. Proposed gasification technologies (continued)
Suspension gasifier
OK!

9. Proposed gasification technologies (continued)
Dual bed gasifier OK!

10. Proposed gasification technologies (continued)
Two stage gasifier OK!

11. Results from tissue drying model
Syngas has a lower heating value than LPG.
A higher gas flow is needed. This means that
more energy is used for heating the energy gas to the working temperature of the hood.
A detailed simulation model has revealed that the increased need for energy gas is lower than 3 % for all cases investigated.

12. Integrated or stand-alone gasification?
Today, steam is produced in a bioboiler.
Tissue drying is the main steam consumer.
Today´s biomass consumption is 2830 kg/h.
Today, LPG for tissue drying is bought.
When producing the energy gas on-site, excess heat can
be used for steam generation.

13. Base case energy system

14. Integrated gasification process

15. Stand-alone gasification process

16. Increased biomass consumption for replacing the bought LPG

17. Benefits of process integration
Could the bought LPG be replaced with bought ”green” energy gas?

18. Research questions revisited
Gasification technology is commercially available!
- What about burners?
Need for energy gas only increases marginally.
Benefits of process integration are obvious!
- Will ”green energy gas” be available?

19. More details