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在一塔高为4m填料塔内,用清水逆流吸收混合气中的氨,入塔气体中含氨0.03(摩尔比),混合气体流率为0.028kmol/(m2·s),清水流率为0.0573kmol/(m2·s)要求吸收率为98%,气相总体积吸收系数与混合气体流率的0.7次方成正比。已知操作条件下物系的平衡关系为Y*=0.8X,试求:
(1)当混合气体量增加20%时,吸收率不变,所需塔高?
(2)压力增加1倍时,吸收率不变,所需塔高?(设压力变化气相总体积吸收系数不变)
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