Post-Combustion CO2 Capture in Kraft Pulp Mills - Technical, Economic and System Aspects
Doktorsavhandling, 2008

As a result of increasing concerns about climate change, there is considerable research and activities around CO2 capture and storage. In this thesis it is studied what role the pulp and paper industry can play in mitigating climate change through CO2 capture and storage. The technique evaluated here is post-combustion CO2 capture using chemical absorption. This technique is chosen since it does not require any rebuilding of the recovery boiler. Two different absorbents are used, mono-ethanolamine (MEA) and chilled ammonia. CO2 capture from flue gases leads to a considerable energy penalty for the regeneration of the absorbent. Therefore the main objective of this thesis is how to supply the extra energy demand needed for the CO2 capture. This energy supply can be divided into four main categories: producing more steam, creating excess steam at the mill, using excess heat from the mill and creating an energy combine. The studied configurations are evaluated by calculating the avoidance cost using different possible future energy market scenarios. The results show that an increasing degree of heat integration leads to a lower avoidance cost for the CO2. This is due to a lower demand for external fuel. The results also show that chilled ammonia has a better performance compared to MEA, due mainly to a lower heat demand for regeneration of the absorbent, smaller gas volume and thereby smaller equipment and lower investment cost. The chilled ammonia capture process also opens up for very interesting ways of heat integration with the mill. However, there are alternative uses of the excess heat and excess steam. Therefore extensive analyses must be performed in order to identify the best use. Results presented here show that under certain conditions CO2 capture can be the best use of energy excess for the mill. Under these conditions CO2 capture and storage can be very profitable for the pulp and paper mills.

Chemical absorption

Excess heat

Post-combustion

Chilled ammonia

Process integration

Mono-ethanolamine

Pulp and paper

CO2 capture

VG-salen, Sven Hultins Gata 6
Opponent: Prof. Carl-Johan Fogelholm, Laboratory of Energy Engineering and Environmental Protection, Helsinki University of Technology, Finland

Författare

Erik Hektor

Industriella energisystem och -tekniker

CO2 capture from recovery boiler flue gases with biomass energy or heatpump

Proceedings of the 8th International Conference on Greenhouse Gas Control Technologies,; (2006)

Konferensbidrag (offentliggjort, men ej förlagsutgivet)

Carbon Dioxide Capture in the Pulp and Paper Industry

The 4th Nordic Minisymposium on Carbon Dioxide Capture and Storage,; (2005)

Konferensbidrag (offentliggjort, men ej förlagsutgivet)

Future CO2 removal from pulp mills - Process integration consequences

Energy Conversion and Management,; Vol. 48(2007)p. 3025-3033

Artikel i vetenskaplig tidskrift

Ämneskategorier

Energiteknik

Kemiteknik

ISBN

978-91-7385-178-7

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 2859

Publication - Department of Heat & Power Technology, Chalmers University of Technology: 2008:3

VG-salen, Sven Hultins Gata 6

Opponent: Prof. Carl-Johan Fogelholm, Laboratory of Energy Engineering and Environmental Protection, Helsinki University of Technology, Finland

Mer information

Skapat

2017-10-06