I n order to clarifY the causes of the excess accumulation of mollen materials in the blast furnace hearth which gives rise to a trouble in the blast furna ce operation , such as hanging and slillping, the behaviour of .flowing out and accumulating of slag in the hearth have been studied by m~ans of model eXlleriments. The results of th~ model experiments were analyz ed as the scale-up problem based on the th~ories of .fluid dynamics. The in.fluential fa ctors such as the porosity 0, the shape fac tor
SynopsisThe solubilities of titanium and carbon in Fe-Csat Ti alloys were determined at temperatures from 1300°C to 1500°C. Some of the already reported values of titanium solubility were determined by measuring the acid-soluble titanium dissolved in rapidly cooled samples which inevitably contain the particles of titanium carbide sedimented during cooling. The sedimentation of titanium carbide results in the djfficulty in determining the accurate solubility of titanium. In order to solve this difculty, methods were newly devised to measure the total titanium content in rapidly cooled samples.The results obtained are as follows;(1) The solubility of titanium at temperatures from 1300°C to 1500°C was expressed as, log [%Til = (-6 760/T)+3.965(2) By the use of the carbon solubility in iron with different concentrations of titanium, the temperature dependence of the interaction coefficient, eTi, at temperatures from 1350°C to 1500°C was determined as, eTi -(-221/T)-0.072 (3) The change of standard Gibbs free energy for the reaction, Ti + Csat = T(s) , was obtained as 4G° = -30 500+ 13.3T (cal/ mol).
The resuUs of lhe model experiments about the slag flow in the blast furnace hearth') have been combined with the slag balance in lhe hearth to give an equal ion which relates the slag tapping conditions to each other. The following results were oblained by using lhe equal ion for the simulalion of the slag tapping operalion as well as for the analpes of operational dala: (1) The calculaled amount of slag lapped agreed well with lhat observed. (2) An increase in lhe calculated amount of residual slag caused the blaslfurnace hanging morefrequentLy. (3) The residual amounl of slag and the depth of slag layer at the beginning of ils flow-out increased wilh lhe increase in lhe rale of slag tapping and in lhe viscosity of slag. (4) The increase in the number of lapping operations was beneficial 10 reduce the de/Jtlt of slag layer.
Synopsis:In order to clarify the causes of the excess accumulation of molten materials in the blast furnace hearth which results in blast furnace troubles, such as hanging and slipping, the behaviour of flowing out and accumulation of slag in the furnace hearth is investigated.The results of model studies of slag flow in the furnace hearth during tapping were analyzed as the scaleup problem based on the theories of fluid dynamics. The dimensionless flow-out coefficient FL in eq. (32) has been found to be closely related to the slag residual ratio, i.e. the ratio of residual amount of slag at the end of tapping to that accumulated at the begining (Fig. 8).Further investigation using this relation shows that eight independent variables, i. e. viscosity, tapping amount, tapping rate and depth of slag, hearth diameter, effective hearth area, number of tapping and permeability of packed coke, determine the behaviour of flowing out and accumulation of slag in the furnace hearth. The results of investigations are as follows;
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.