Mercury speciation in pulverized fuel co-combustion and gasification

Mercury speciation in pulverized fuel co-combustion and gasification

Sable, S.P.

Spliethoff, H. (promotor)

Mechanical Maritime and Materials Engineering

2007-11-13

Coal based power generation is a significant source of mercury emissions to the atmosphere and this has attracted huge attention in the past decade. Recently, the concerns regarding global warming and need for new energy resources introduced the concept of cofiring of biomass and waste as secondary fuels in the power industry. The addition of a variety of secondary fuels will change the behaviour of mercury in the combustor which will then affect the design of emission control technology. This PhD thesis primarily focused on the impact of secondary fuels and the combustion conditions on mercury speciation in pulverized fuel co-combustion of secondary fuels with coal. The experimental work of this thesis mainly involves bench scale studies to investigate the speciation of mercury in pulverized fuel co-combustion under air-staging and at different combustor temperatures (1000 and 1300ºC). A new model is developed to predict different forms of mercury in the post-combustion zone upstream of a particulate control device. The model incorporates reactions of mercury with flue gas species and simultaneous adsorption of oxidized mercury (HgCl2) on fly ash particles in cooling of flue gases. Additional work is concentrated on understanding the mercury speciation under gasification conditions. In gasification processes, most of the mercury is exist in elemental form. A kinetic model has been developed to predict speciation of mercury in gasification product gas.

mercury speciations
pf co-combustion
gasification

http://resolver.tudelft.nl/uuid:7abf6b8d-fef2-4594-8173-aa4275a81654

978-90-9022171-7

Institutional Repository

doctoral thesis

(c) 2007 S.P. Sable