23 Lime Kiln Chemistry Effects on Operations is fed into a rotary kiln where it is dried and heated countercurrently by combustion gases from an oil or gas burner at the other end of the kiln As the mud temperature reaches about 800oC 1470oF in the calcination zone of the kiln CaCO3 decomposes into CaO and CO2 Reaction 3 The resulting CaO or reburned lime is reused in the causticizing
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221 LIME KILN PRINCIPLES AND OPERATIONS Terry N Adams PhD Technical Consultant 900 Lenora Street Unit 200 Seattle WA 98121 ROTARY LIME KILNS Slides 1 and 2 are the title and outline for the presentation Slide 3 below shows a schematic of the exterior of a modern rotary limereburning kiln Slide 4 shows a schematic of the interior
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23 Lime Kiln Chemistry Effects on Operations A lime kiln is used to convert lime mud into lime for reuse in the causticizing plant of the kraft recovery process Many of the problems encountered in lime kiln operations can be related to kiln chemistry including TRS and SO2 emissions dusting ringing and refractory brick thinning
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Many of the problems encountered in lime kiln operations can be related to kiln chemistry including TRS and SO2 emissions dusting ringing and refractory brick thinning
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23 Lime Kiln Chemistry Effects on Operations A lime kiln is used to convert lime mud into lime for reuse in the causticizing plant of the kraft recovery process Many of the problems encountered in lime kiln operations can be related to kiln chemistry including TRS and SO2 emissions dusting ringing and refractory brick thinning
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“Effects of CNCG Burning on Lime Composition and SO 2 Emissions from a Lime Kiln” Tran HN et al 0 200 400 600 800 1000 0 5 10 15 20 Total S Input kg St CaO SO2 Emissions ppm 80 85 90 95 100 S Absorption Efficiency • S Absorption Efficiency decreases as S input to kiln increases ⇒Increased SO 2 emissions
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Although efficient lime mud washing can remove most of the residual sodium sulphide the remaining moisture content of the mud still contains some sodium sulphide Therefore improved lime mud dewatering can be effective in reducing the TRS emissions from the lime kiln Data presented in this study confirms that as the lime mud solids content
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DSouza TM Effect of Process Variability on Ring Formation in Lime Kilns Thesis Department of Chemical Engineering Applied Chemistry University of Toronto 2005
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A lime kiln is used to convert lime mud into lime for reuse in the causticizing plant of the kraft recovery process Many of the problems encountered in lime kiln operations can be related to kiln chemistry including TRS and SO2 emissions dusting ringing and refractory brick thinning Understanding the composition and thermal behaviour of
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2 3 Lime Kiln Chemistry Effects on Operations The resulting lime mud is fed into a rotary kiln where it is dried and heated counter currently by combustion gases from an oil or gas burner at the other end of the kiln As the mud temperature reaches about 800oC 1470oF in the calcination zone of the kiln
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The lime kiln in a kraft pulp mill converts lime mud which is largely composed of calcium carbonate CaCO 3 into burnt lime ie calcium oxide CaO and carbon dioxide CO 2 This thermal decomposition reaction requires a high temperature and occurs spontaneously when the lime mud temperature exceeds approximately 800 °C in a gas
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Key unit operations including the recovery boiler recaust plant lime kiln and power generation have significant impacts on maintaining high mill production rates The purpose of this year’s sessions and panels is to provide experiences from industrial and academic experts on equipment maintenance process chemistry and new technologies
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3 Lime Kiln Chemistry Effects on Operations 2 1 LIME KILN CHEMISTRY AND EFFECTS ON KILN OPERATIONS Honghi Tran Pulp Paper Centre and Department of Chemical Engineering and Applied Chemistry University of Toronto Toronto Canada ABSTRACT A lime kiln is used to convert lime mud Get price
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23 Lime Kiln Chemistry Effects on Operations is fed into a rotary kiln where it is dried and heated countercurrently by combustion gases from an oil or gas burner at the other end of the kiln As the mud temperature reaches about 800oC 1470oF in the calcination zone of the kiln CaCO3 decomposes into CaO and CO2 Reaction 3 The resulting
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vertical kilns for coal calcination Vertical lime kiln just like its name the shape is erect It is used for calcination limestone Due to has low energy cons
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2 3 Lime Kiln Chemistry Effects on Operations The resulting lime mud is fed into a rotary kiln where it is dried and heated counter currently by combustion gases from an oil or gas burner at the other end of the kiln As the mud temperature reaches about 800oC 1470oF in the calcination zone of the kiln
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23 Lime Kiln Chemistry Effects On Operations The resulting lime mud is fed into a rotary kiln where it is dried and heated counter currently by combustion gases from an oil or gas burner at the other end of the kiln View Details Send Enquiry Lime Kiln Fundamentals Convergence Training
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product properties The variations are large Shaft kiln operations are reported at 32–49 GJ per ton product and rotary kilns at 51–92 GJ per ton product 3 The benefits of the rotary kiln are eg higher utilization of quarried raw material different product quality and higher fuel flexibility
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fields such as cement precalciner rotary lime kiln etc12 But so far very few expressions have existed for the processes in a cement rotary kiln which include fuel combustion heat transfer and clinker chemistry One of important reasons is the complexity of
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varies measurably over the length of the kiln 2 Shell ovality and the effects of heavy coating on ovality are impossible to assess on a cold kiln 3 Support roller thrust load adjustments are only possible on a running kiln 4 Measurements of pier load fluctuations in the course of kiln rotation are only possible on a running kiln
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2 Distance between tires The longer the shell span the less it will resist high temperatures without sagging Therefore longer spans have more tendencies to develop permanent deformation than shorter spans 3 Kiln shell structure Kiln shells are made with structural rolled steel plate such as
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