Pilot-scale combustion studies with kraft lignin as a solid biofuel
Paper i proceeding, 2008

Processing of kraft lignin precipitated from black liquor to produce a solid biofuel with high energy density and low ash content has been developed in research programs by STFI-Packforsk and partners. In preparation for full-scale combustion trials, tests were carried out on pilot scale in a 150 kW powder burner and in a 12 MWfluidized bed (CFB) boiler. Lignin powder could be fired in a powder burner with good combustion performance after some trimming of the airflows to reduce swirl. Lignin dried to 10 % moisture content was easy to feed smoothly and had less bridging tendencies in the feeding system than wood/bark powder. In the CFB boiler lignin was easily handled and co-fired together with bark. Although the filter cake was broken into smaller pieces and fines the combustion was not disturbed. When co-firing lignin with bark, the sulfur emission increased compared to bark firing only, but most of the sulfur was captured by calcium in the bark ash. Conventional sulfur capture with addition of limestone to the bed was also demonstrated. The sulfur content in the lignin had a significantly positive effect on reducing the alkali chloride content in the deposits, thus reducing the high temperature corrosion risk.

Författare

Niklas Berglin

Innventia

Per Tomani

Innventia

Hassan Salman

Energy Technology Centre

Solvie Herstad Svärd

S.E.P. Scandinavian Energy Project AB

Lars-Erik Åmand

Chalmers, Energi och miljö, Energiteknik

Engineering, Pulping and Environmental Conference 2008, TAPPI; Portland, OR; United States; 24 August 2008 through 27 August 2008

Vol. 4 2571-2580

Ämneskategorier

Pappers-, massa- och fiberteknik

ISBN

978-160560508-1

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Senast uppdaterat

2018-09-06