Air heater Nr.11 repair at Blast Furnace 4 at Chelyabinsk Metallurgical Plant
In September 2021 Refracon Installations LLC performed a lining refractory repair of the air heater combustion chamber No.11 of BF No.4 at the Chelyabinsk Metallurgical Plant, using the gunning method.
To identify the areas in need of repair, a commission inspection was carried out in cooperation with specialists of the PJSC Chelyabinsk Metallurgical Plant. The most damaged areas were the arches and inner rounds of the gas burner nozzle and the hot blast valve nozzle as well as the protection wall of the combustion chamber. Based on the inspection, a repair plan was devised which consisted of successive gunning of nine monolithic belts with a thickness of 100-250 mm.
The destroyed lining was removed, and the remaining usable refractory layer underwent cleaning. The next step was the installation of anchors every 250 mm, and then the gunning work itself was carried out. The ring lining was performed with panels of approximately 1200mm x 1200mm. In total 40 tonnes of material were applied.
Refracon Installations, in partnership with Seven Refractories, carried out all the work in-house, from the design to the commissioning of the unit. This is the second time in 2021 that Refracon Installations LLC has been involved in the repair of the combustion chambers at ChMK air heaters. The cooperation with Chelyabinsk Metallurgical Plan has already been ongoing for three years.