关键词: 全氧燃烧, 抗碱蒸气侵蚀性, 优质硅砖, 零膨胀硅砖, 熔铸锆刚玉砖, α-β刚玉砖

Abstract: Crucible method was used to compare the alkali vapor corrosion resistance of high-quality silicon brick,zero expansion silicon brick,fused cast zirconia corundum brick (AZS33) and α-β corundum brick for oxy-fuel combustion glass furnace insulated at 1 600 ℃ for 2 h.The microstructures of the samples after corrosion were analyzed.The results show that:(1)high-quality silica bricks and zero-expansion silica bricks have higher apparent porosity,under high temperature and vapor conditions,calcium silicate oxides and glass phases continuously precipitate and drip,continuously melting SiO₂ particles,resulting in poor resistance to vapor attack;(2)under the action of alkali vapor,fused cast zirconia corundum bricks produce more glass phases,which drip and form pores,however,the fused cast zirconia corundum bricks have low apparent porosity,the alkali vapor corrosion and penetration is slow,and the corrosion resistance to alkali vapor is excellent;(3)α-β corundum bricks have low glass phase content and low apparent porosity,after alkali vapor corrosion,the skeleton structure remains perfectly,which have stronger corrosion resistance to alkali vapor;(4)the alkali vapor resistance order of the four types of bricks is:α-β corundum brick>fused cast zirconia corundum brick>zero expansion silica brick>high-quality silica brick.

Key words: oxy-fuel combustion, alkali vapor corrosion resistance, high-quality silica brick, zero expansion silica brick, fused cast zirconia corundum brick, α-β corundum brick