8th International Congress on Science and Technology of Ironmaking - ICSTI 2018

Heating of blast has been and remains one of the most important parameters which determine the economic efficiency of blast furnace production. However, for several decades the maximum level of blast temperatures remains unchanged (1200-1250°C). This shows the limited capacity of conventional hot stoves with internal and external combustion chambers. The paper presents a new unique design of top combustion stoves, i.e. Kalugin Shaftless Stove. These stoves make it possible to achieve the hot blast temperature of 1300-1400°C with the use of standard refractory materials (silica, mullite-corundum and fireclay bricks) and provide high economic and environmental performance with the service life of 30 years. In these stoves gas combustion is performed by pre-chamber type burner with jet and vortex supply of gas and air. The burner is installed at the top of the dome and provides full combustion of gas without flame pulsation before its entrance to the checkerwork and uniform distribution of combustion products over the checkerwork. These stoves have small dimensions, which effects a saving of 30-50% on refractory materials. Moreover, they can be used for reconstruction of existing hot stoves and installed instead of old stoves on the same foundation. At present more than 200 Kalugin Shaftless Stoves are successfully operated at iron and steel works in China, Russia, Ukraine, India, Japan, Kazakhstan, Indonesia, Turkey, Brazil, Syria and Czech Republic.