花板尺寸大小，是决定脉冲布袋除尘器结构尺寸的关键。花板上的圆孔用于固定滤袋，孔的中心距过小，会使除尘器内的截面风速（即常说的罐口风速—-can velocity）过高，阻力增大，清灰时粉尘沉降困难；还有可能使除尘滤袋之间相互发生摩擦，缩短滤袋的使用寿命。相反中心距过大，会增大除尘器的体积，多费钢材。所以要合理地确定滤袋中心距尺寸。

　　确定花板尺寸取决于脉冲阀的喷吹能力。一个脉冲阀配一根喷吹管，一根喷吹管能喷吹多少条除尘器布袋n3和滤袋之间的纵向中心距L1，取决于脉冲阀的规格，滤袋横向中心距L2取决于滤袋的规格。以3″淹没式众享彩票喷吹φ160×6000mm的滤袋为例，n3＝16条, L1＝250mm； L2＝230mm。滤袋之间的净距离取70mm。

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