Refractory lining of coke ovens

Refractory lining of coke ovens Refractories and Industrial Ceramics Vol. 41, Nos. 7-8, 2000 EQUIPMENT UDC 662.741.041.043.1:666.762.2 Yu. S. Zaitsev 1 and N. N. Zaitseva ~ Translated from Ogneupory i Tekhnicheskaya Keramika, No. 7, p. 42, July, 2000. A new technological solution that makes it possible to reduce the duration of coking and increases the effi- ciency of coke ovens is described. The effect is provided by lining the walls of the coke oven with shaped dinas refractories with a blind hole in the form of a truncated cone. At present, the industry consumes about 30% of mined of its walls turned out to be insufficient; in service, cracks fuel. The greater part of it is used by industrial furnaces that appeared on the walls and the furnace had to be shut down [2]. produce cast iron, steel, nonferrous metals, glass, various The Domna Company has developed a new technologi- kinds of refractory articles, and building materials. cal solution that eliminates this disadvantage and is charac- The design of the furnaces differs greatly. In all types of terized by a diminished heat resistance of the walls of the fuel furnaces, the energy for performing the manufacturing coking chamber, which makes it possible to shorten the cok- process occurs as a result of fuel combustion. The most com- ing time and increase the efficiency of the furnace. This is plex and advanced methods of the complex use of fuel are provided by lining the walls of the coke oven with shaped employed at the most power-consuming enterprises of fer- dinas refractories having a blind hole in the form of a trun- rous metallurgy. cated cone and equipped with rods placed into the holes. The A typical feature of a modern reduction process is its in- rods are made of SiC with a thermal conductivity of 10- tensification accompanied by enhanced productivity of the 13 W/(m- K). Silicon carbide has a high thermal strength equipment, more effective use of it, and savings in material (1500~ and heat resistance (100 - 130 heat cycles) and an and fuel. elevated initial temperature of softening (1530~ it ope- In designing a heating unit, its building and repair, we rates well in a reducing medium, which provides a high sta- should solve the problem of an appropriate choice of refrac- bility of the rods on the side of the functional space of the tories. A correct solution of this problem determines the nor- furnace filled with the coking charge. On the side of the heat- mal work of such units, their service life, the length of the pe- ing partitions the medium is oxidizing, because the fuel riod between repairs, the possibility of intensification of the burns under conditions of excess air [3]. processes, the quality of the products, and other parameters. The mass of the silicon carbide rods for equipping one The Domna Company reconstructs old heating units and coke oven amounts to about 6 tons. When the walls of the builds new ones with a resistance that depends on the cor- chambers of coke ovens are lined with reinforced dinas rectness of the choice of the lining [1]. refractories, the heat resistance of the walls of the coking The elevated thermal conductivity of the walls of coking chamber decreases by 30%, the duration of the coking de- chambers is very important for the by-product coke industry. creases by 18 -25%, and hence the efficiency of the furnace The walls of the chambers of coke ovens are lined with increases twofold. 2 shaped dinas refractories. The thermal conductivity of dinas at 1000~ is not high and amounts to 2.1 W/(m. K), which REFERENCES limits the efficiency of the ovens. The duration of a coking 1. I. S. Kainarskii, E. V. Degtyareva, I. Ya. Shvartsman, and period is 14 - 16 h. G. M. Vo|'fonskii, Refractories for Coke Ovens [in Russian], In order to increase the efficiency of coke ovens the Metallurgiya, Moscow (1966). dinas lining can be replaced by a corundum lining with a 2. Yu. S. Zaitsev and O. V. Filip'ev, Dustless Unloading of Coke from Coke Ovens [in Russian], Osnova, Kharkov (1993). thermal conductivity of 4.43 W/(m. K). An experimental 3. Yu. S. Zaitsev and O. V. Filip'ev, Industrial Furnaces [in Rus- furnace of this kind has been built and tested, but the strength sian], KhGPU, Kharkov (1999). I Domna Company, Kharkov, Ukraine. 9 RF Patent No. 2028364. 1083-4877/00/0708-0249525.00 9 2001 Kluwer Academic/Plenum Publishers Refractories and Industrial Ceramics Springer Journals

Refractory lining of coke ovens

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Springer US
Copyright © 2001 by Kluwer Academic/Plenum Publishers
Chemistry; Characterization and Evaluation of Materials; Materials Science; Ceramics, Glass, Composites, Natural Methods
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