Demonstration of high biomass ratio co-firing at existing coal fired boiler

Abstract

There is a CO₂ emission reduction method of burning woody biomass and coal, as a technical method to reduce the CO₂ emission of the coal fired power plant. But a co-firing woody biomass ratio of the existing coal fired power plants gives only the 2-3% co-firing ratio due to some restrictions, so we have performed studies and examinations for providing the useful technical knowledge. Based on the result, we performed the verification test of 25cal% in a quality of woody pellet with commercial coal fired power plant of 149MW. When the verification test was performed with 25cal% co-firing ratio, this boiler which has 4 mills was operated while three mills pulverized coal and one mill pulverized woody biomass. The boiler had been performing the stable operation during that test. This text introduces the studies, examinations and verification test for high co-firing ratio of woody biomass.