In a slagging combustion system some of ash/slag generated through the combustion of solid fuels is molten and adheres to tube surfaces or the refractory wall during operation A submodel for predicting molten slag droplet deposition in the slagging combustion systems has been developed The maximum spread diameter and excess rebound energy have
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— Nevertheless the coefficient determined in the cement with 10% coal fly ash and 70% ground granulated blast furnace slag is higher × 10 −12 m 2 /s than the one found in the cement with only 70% ground granulated blast furnace slag × 10 −12 m 2 /s Accordingly the combined effect of cements containing ground granulated
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— The massive accumulation of iron ore tailing IOT results in land resource wastage and increases the possibility of environmental pollution In this study the feasibility of using low carbon alkali activated ground granulated blast furnace slag lime/Carbide slag CS GGBS and coal fly ash CFA instead of portland cement PC for solidifying IOT
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— The differences in the thermal conductivity of ash samples with predictions based on slag type structure are attributed to the partial sintering of the ash samples during experiments Fig 15 presents estimates for the thermal conductivity of slag type and particulate type material for a porosity of The predicted results are compared with
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— The structure features of the coal char mixed with/without slag was characterized by BET and SEM The experiments of thermogravimetric analyzer were conducted to obtain the coal pyrolysis characteristics The kinetic parameters of coal pyrolysis reaction were extracted using the reaction model based on the Arrhenius law
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— Burning coal produces coal combustion residuals CCR or byproducts which include fly ash bottom ash boiler slag flue gas desulfurization residues and fluidized bed combustion ash Over 70% of waste coal ash is categorized as fly ash FA fine particulates captured by particulate control equipment ranging in size from μm to 300
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— When alkali activated slag material is used in porous concrete it has the problems of short setting time and poor operability In this paper the effect of coal bottom ash content on the rheological properties the mechanical properties porosity permeability coefficient and PFT of AACS PC of the paste was investigated
— The densities of re melted coal slag melts were measured in air using Archimedean double bob method in the temperature range from 1350 to 1600 ° main components of gasified coal slags are SiO 2 Al 2 O 3 CaO MgO FeO and Fe 2 O consisting of the main components with systematic composition variations were
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— uniformity coefficient calculation are as follows No 1 is uniform C u = and No 2 is non uniform C u = Table 1 Chemical composition of the ash and slag wastes from two ash dumps Sampling location Characteristics of the ash and slag Content of elements in terms of oxides % by weight Type Kind CaO MgO SiO 2 Al 2 O 3 Fe 2 O
The aim of the study was to prepare a porous sound absorbing material using steel slag and fly ash as the main raw material with coal powder and sodium silicate used as a pore former and binder respectively The influence of the experimental conditions such as the ratio of fly ash sintering temperature sintering time and porosity regulation on the performance of
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— A Study of Water Permeability of Coal Ash and Slag to Assess the According to published data the permeability coefficient of ash and slag wastes usually varies from to 4 m/day
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— The effect of slag basicity CaO/SiO2 and carbon content in iron [C] on sulfur content in gas {S} calculation T= 1773 K P = 1 atm active coefficient of FeO in slag 7 o [6] The compositions of raw materials are listed in Table 1
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— Coal fly ash is primarily produced in power plants as a byproduct of coal combustion As shown in Fig 1 the by products of coal ash combustion include fly and bottom ash boiler slag and flue particles the main by product are fine powdery particles and heterogeneous
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— Gasification or combustion of coal and biomass is the most important form of power generation today However the use of coal/biomass at high temperatures has an inherent problem related to the ash generated The formation of ash leads to a problematic phenomenon called slagging Slagging is the accumulation of molten ash on the walls of
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