Optimized uptake of carbon dioxide from biogas using calcium-rich ash

Last changed: 06 February 2019

Upgrading to fuel quality increases the value of biogas, but currently the costs are high at low gas flow rates. The ash from woodfuel contains a considerable amount of calcium, which has properties that make it well suited to remove carbon dioxide from the flow and convert it to solid components.

The purpose of the project is to use lab trials to investigate how the ability of an ash bed to bind carbon dioxide is influenced by changes in gas flow and ash humidity as well as how the process is influenced by the dimensions of the ash bed. The aim is further to investigate the gas quality of the resulting gas with regards to any contamination that might arise due to reactions in the ash as well as how to evacuate used ash beeds fast and effectively in order to reduce methane emissions.
The aim is to produce a better decision support for designing energetically and economically cost effective systems for upgrading biogas from farms to vehicle quality using ash.

The project was financed by Stiftelsen lantbruksforskning

Participating from the department was Åke Nordberg (as project leader)

External partner was  JTI - Swedish Institute of Agricultural and Environmental Engineering