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一、等距排布的多微孔直通式供气砖一般的直通多微孔式供气砖的针孔排布如图1所示。由于这种供气砖中的直通孔纵横排列整齐,因此易于制造,但在使用时损耗速度大,寿命短。原因是由于在使用过程中直通孔H被气体冷却,而其他部分却被钢液加热,所以: (1) 图1(a)中的符号1～4所代表的拐角处产生热应力,从而造成耐火物A的剥离。 (2) 如图1(a)所示,相对于符号5所表示的孔的位置来说,符号6、8、10、12与之等距,而符号7、9、11、13所表示的孔却是上述等距长度的1.4倍,由此可能产生热应力并造成耐火材料A的剥离。为减小图1(a)中拐角部位的热应力,曾采用图1(b)所示的直通孔排布方式,但实用中的效果不太明显。那么如何解决这个问题呢? 根据上述两个应力产生的机理,可改变
First, the equidistant arrangement of microporous straight-through gas supply brick general through microporous gas supply pinhole arrangement shown in Figure 1. Since the through holes in the gas supply brick are arranged vertically and horizontally, they are easy to manufacture. However, when they are used, the loss rate is large and the service life is short. The reason is that the through-hole H is cooled by the gas during use, and the rest is heated by the molten steel, so that: (1) thermal stress is generated at the corners represented by symbols 1 to 4 in FIG. 1 (a) Refractory A stripping. (2) As shown in FIG. 1 (a), the symbols 6, 8, 10 and 12 are equidistant from the positions of the holes indicated by symbol 5, and the symbols 7, 9, The pores are 1.4 times longer than the above-mentioned equidistant lengths, whereby thermal stress may be generated and delamination of refractory material A may occur. In order to reduce the thermal stress in the corner of Fig. 1 (a), the through-hole arrangement shown in Fig. 1 (b) was used. However, the practical effect is not obvious. So how to solve this problem? According to the above two mechanisms of stress can be changed