Co-combustion: A summary of technology

Bo Leckner
2007 Thermal Science  
Co-com bus tion of bio mass or waste to gether with a base fuel in a boiler is a sim ple and eco nom i cally suit able way to re place fos sil fu els by bio mass and to uti lise waste. Co-com bus tion in a high-ef fi ciency power sta tion means uti li sa tion of bio mass and waste with a higher ther mal ef fi ciency than what oth er wise had been pos si ble. Due to trans port lim i ta tions, the ad di tional fuel will only sup ply a mi nor part (less than a few hun dreds MW fuel ) of the en
more » ... uel ) of the en ergy in a plant. There are sev eral op tions: co-com bus tion with coal in pul ver ised or fluidised bed boil ers, com bus tion on added grates in serted in pul ver ised coal boil ers, combustors for added fuel cou pled in par al lel to the steam cir cuit of a power plant, ex ter nal gas pro duc ers de liv er ing its gas to re place an oil, gas or pul ver ised fuel burner. Fur ther more bio mass can be used for reburning in or der to re duce NO emis sions or for after burning to re duce N 2 O emis sions in fluidised bed boil ers. Com bi na tion of fu els can give rise to pos i tive or neg a tive syn ergy ef fects, of which the best known are the in ter ac tions be tween S, Cl, K, Al, and Si that may give rise to or pre vent de pos its on tubes or on cat a lyst sur faces, or that may have an in flu ence on the for ma tion of di ox ins. With better knowl edge of these ef fects the pos i tive ones can be uti lised and the neg a tive ones can be avoided.
doi:10.2298/tsci0704005l fatcat:j4ssg54nkzfcvoowifadufddju