Quality of refractories and the durability of coke furnaces

Papers presented at the Fifteenth Annual Seminar of Coke and Refractory Specialists are reviewed; the seminar was held in 2008 at OAO Dinur (Pervouralsk, Sverdlovsk Oblast).     

Dinas refractories based on the lime bond for coke furnaces

Conclusions Tests on dinas refractories with a lime bond in the structure of experimental coke ovens, and the results of a study of their properties after service, confirm their working capability and promise for use in the vertical zone of industrial furnaces.Translated from Ogneupory, No. 7, pp. 36–38, July, 1991.     

Production of high-strength dinas brick for coke oven ports

Conclusions Reinforced pressure molds for 250 ton friction presses allows a firm ramming of the mass without deformation of the dies during pressing.Before placement into the kiln the green compact has to be checked carefully for weak corners and edges.It is desirable to space the green compacts in the kiln at a minimum distance of one meter from the regular brick at the bottom. Temperature soak time holding should be extended from 3 to 5 hours in burning large-size brick.It is recommended to develop the production of brick for coke oven ports from 100% Ovruch quartzite at Krasnogorovka Plant.     

Carborundum refractories for iron scale reducing furnaces and natural gas converting furnaces

Conclusions The results of the laboratory tests have been confirmed by industrial conditions (2) and it has been found that the addition of clay to coarse grained mixtures reduces the oxidibility of carborundum parts during service at comparatively low temperatures, when the furnaces are fired with natural gas.The development and introduction of rational technology has sharply increased the resistance of carborundum refractories in furnaces used for the reduction of scale and the conversion of gas, when they are fired with natural gas.     

Rational coke preparation for blast furnaces

The relation between the CSR and CRI values of coke and its familiar characteristics is analyzed. The strength and reactivity of coke differ over the blast-furnace height. The economic importance of each of these properties may only be established for specified blast-furnace conditions and technology. The systems for coke stabilization must be selected on the basis of the specific properties of the coke. There can never be a general solution. The optimal stability must be determined for each coke-furnace combination. Literature sources that address the following issues are identified: the equipment for improving coke properties; the necessary processes and their regulation; and the method for determining optimal blast-furnace conditions on the basis of the characteristics of the specific coke-furnace system.