CURRENT STATUS OF ALTERNATIVE FUEL USE IN LIME KILNS, 2008 Engineering, Pulping and Environmental Conference

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Lime kilns consume large amounts of fossil fuels. Due to the steady rise in natural gas and fuel oil costs in recent years, there is a need for mills to find more economical fuel alternatives that have minimal impacts on lime kiln and chemical recovery operations. This paper examines the technical feasibility of various alternative fuels, including petroleum coke, directly fired or gasified wood residues, precipitated lignin, bio-oil and olein biofuel. Since each fuel has a different composition, heating value and burning characteristic, it is important to understand the pros and cons of burning each fuel before implementing it in the lime kiln.