Changes in the Structural Phase of Dinas in Calcining Furnaces of Coke Production
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Vol. 61, No. 1, May, 2020
CHANGES IN THE STRUCTURAL PHASE OF DINAS IN CALCINING FURNACES OF COKE PRODUCTION C. M. Logvinkov,1 G. N. Shabanova,2,3 A. N. Korogodskaya,2 V. N. Shumeyko,2 O. N. Borisenko1 Translated from Novye Ogneupory, No. 1, pp. 51 – 66, January, 2020.
Original article submitted October 7, 2019. This article presents the results of studies that determine the changes in the phase composition and structure of dinas refractories under the operating conditions of coking coal. Their changes are attributed to differences in the temperatures and rates of dinas cooling/heating during the cyclic loading/unloading of coked materials, the conditions of refractory contact with an operating environment, and the degree and nature of mechanical loads in different masonry zones of coke ovens. The regularities and features of macro- and microstructural organizations in combination with the formation phase composition of dinas refractory in various zones of coke oven masonry have been noted. No critical changes in the integrity of dinas product materials relative to microstructure and phase composition have been revealed. Data have confirmed the further operational suitability of such products under testing conditions on the stand unit of pilot production. Keywords: coke oven, lining, dinas refractories, serviceability
cluding that which uses specially formed briquettes), and the bulk swelling and movement of a plastic layer are observed in the direction of temperature field movement. In this case, transiency is due to a continuous change in the thermophysical characteristics of the coke charge because of the release of gas/vapor products and the changes in the density, material composition, and microstructure of components. This circumstance is important for the analysis of possible damage and design calculations of the lining under mechanical loads on heating walls and corresponding normal and bending deformations, along with loads from charging cars, coke pushing forces, and other aspects. Furnace chambers are structurally combined into a battery pack and usually supplemented with two regenerators to increase the efficiency of coke production. Dinas is a traditional refractory for heating walls and the upper part of regenerators because it has better characteristics at high temperatures than chamotte refractories, which are also widely used in other structural elements of coke oven lining [1 – 6]. The refractory production of coke oven batteries yields special grades of dinas because of restrictions on the possibility of using traditional iron-containing mineralizers, which determine the required level of quartz transformation into polymorphic modifications, namely, tridymite and cristobalite. For coke dinas, calcium-containing modifiers are used to a
INTRODUCTION Coke is a primary fuel type and raw material component of iron–carbon alloys, namely, cast iron. The specific calorific capacity of coke is higher than that of metamorphosed anthracite coals, and this parameter determines the use of coke for increasi
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