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过去,国内外炼钢平炉蓄热室的砖格子托拱的厚度均为113毫米,托拱间距为230毫米。砖格子格孔尺寸为150×150毫米,即格孔由下面的230×150毫米过渡到150×150毫米。这样,格孔势必不能直通,不仅气流阻力增加,而且积灰过多,又易于堵孔。此外,厚托拱还表现出许多缺点:(1)由于砖的单重过大,不便于砌砖工人操作,也就难以保证砌砖质量。(2)由于单重过大,制砖也困难,生烧或扭曲,砖的耐压强度较低。为消除上述缺点,我们从1963年以来将托拱砖的厚度改为75毫米,并在5号平炉的两煤气蓄热室试用了。在砌砖中表现出两个优点来:(1)砌砖操作方便,因而质量改善。
In the past, the thickness of the brick lattice arch of steelmaking hearth regenerators at home and abroad were both 113 mm and the distance between the arch ribs was 230 mm. The size of the brick grid is 150 × 150 mm, that is, the grid is transitioned from 230 × 150 mm below to 150 × 150 mm. In this way, the grid will inevitably pass through the grid, not only increased airflow resistance, but also ashes too much, but also easy to plug the hole. In addition, the thick arch also shows many shortcomings: (1) due to the single weight of the brick is not easy to bricklaying workers, it is difficult to ensure the quality of brick masonry. (2) As the single weight is too large, brick making is also difficult, burned or twisted, the brick’s compressive strength is low. In order to eliminate the above drawbacks, we changed the thickness of the arching bricks to 75 mm since 1963 and tried it in the two gas regenerators of No.5 hearth furnace. Two advantages are shown in the brickwork: (1) The brickwork is easy to operate and the quality is improved.