Patent ID: 8865101

Claim:
A method for calcining calcium carbonate lime mud from a Kraft pulp and paper mill and converting it to carbon dioxide and reburned lime comprising: (a) providing wet lime mud sufficiently near a bubbling fluid bed calciner and a spray dryer or flash dryer such that the calciner and flash dryer or spray dryer operate in counter/current gas/solids flow wherein exiting calciner gases substantially dry the wet lime mud and the resulting dry lime mud is fed to the calciner; (b) feeding substantially dry lime mud to the fluid bed calciner wherein the fluid bed calciner is thermally linked by moving media heat transfer (MMHT) to a circulating fluid bed combustor by a heat transfer media wherein said media moves between said calciner and said combustor wherein MMHT provides heat input for calcination; (c) removing substantially all ash from the heat transfer media; (d) recycling the heat transfer media from said calciner to said combustor wherein said combustor receives one or more fuels selected from the group consisting of Kraft pulp and paper mill sludge, biomass, precipitated lignins and NCGs and producing combustion products; (e) recovering excess energy from the process of d) generating superheated high pressure steam; (f) recovering carbon dioxide of 90% to +99% purity and calcined lime mud from the fluid bed calciner; and (g) exporting the superheated high pressure steam to the Kraft pulp and paper mill.