Co-firing coal and straw in PF boilers -- Performance impact of straw with emphasis on SCR catalyst for deNOx catalysts

Conference · Thu Jul 01 04:00:00 EDT 1999

OSTI ID:20082211

Wieck-Hansen, K

A two year co-firing coal/straw program was carried out on a 150 MWel pulverized fired boiler at Studstrupvaerket in Denmark from January 1996 to January 1998. The reason for burning straw is based on a political decision where the Power utilities have accepted to burn 1 mill ton straw/year and 0.4-mill tons wood. This amount is about 5 % of the total fuel consumption for energy production in Denmark. Straw is found to be CO{sub 2} neutral and therefore an important factor in CO{sub 2} reduction. This full-scale long-term test was based on many years' experience with straw firing. Late 1980 tests with coal and straw co-combustion on a test CFB plant were carried out with such successful results, that a full scale plant of 80 MWth was built and commissioned in January 1992. In 1992 the first tests were performed on a grate fired boiler, where up to 30 % straw on energy basis, were co-fired with coal. The growing optimism lead to a short-term test with coal and straw on a pulverized fuel-fired 330th MW boiler in 1993. Limited corrosion was found and a long-term test was accepted on another full-scale boiler. To minimize the overall risk, the authors chose an old boiler, but with the intention of using the technique on new and modern plants equipped with desulfurization and DeNOx catalyst. A comprehensive test program was carried out in order to evaluate and quantify the impact of straw on corrosion, slagging and fouling, emissions and on SCR catalysts deactivation.

• Research Organization: A/S Midtkraft Energy Co., Skodstrap (DK)
• OSTI ID: 20082211
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
09 BIOMASS FUELS
BOILERS
CATALYSTS
COAL
COCOMBUSTION
CORROSION
DEACTIVATION
DENMARK
FOULING
NITROGEN OXIDES
PERFORMANCE TESTING
SELECTIVE CATALYTIC REDUCTION
SLAGS
STRAW