China Nonferrous Metallurgy

In recent years, the development of the side-blowing furnace has constituted a great competitive pressure on the flash furnace, which urgently requires the latter to be developed from a smelting furnace with low reactor heat load and low feed capacity into a high intensity smelting equipment with reactor heat intensity above 2000MJ/m3h and the feed capacity above 230t/h. In this paper, the intensified smelting capacity of flash furnace is optimized and improved from a design perspective including the following aspects: increase the net height of reactor to meet the needs of high feeding amount; sawtooth water jacket+refractory brick structure adopted for the reactor cylinder to adapt to the intense erosion of off-gas; increase the internal width and net height of the settling tank, ensure the designed off-gas flow rate below 6m/s, and slow down the erosion of high temperature off-gas and the dust generation; adopt copper water jacket+refractory brick structure in the gas flow area of settling tank; the leeward side of uptake flue should also be provided with horizontal water jacket; the furnace roof adopts horizontal sawtooth water jacket structure with embedded refractory to prevent the refractory bricks from falling off. In addition, to ensure the safety of the furnace under the condition of high intensity smelting, the monitoring of the furnace bottom temperature and cooling water leakage shall also be considered. The optimized and improved flash furnace can satisfy the expected smelting intensity with stable, safe and reliable operation.