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KD－1干式塔磨已经发展改型为KD－2和KD－3新型塔磨，对于－10μm粒级的细颗粒取得了较高的回收率。这些磨机在粉碎室的尺寸、形状和分级柱的内部直径都是不同的，并且在收集过程中的旋风集尘器的类型也有所区别．在KD－1设备中粉碎和分级操作发生在同一柱内。在KD－3中已经设想的改变方案是在分级柱中减小气流速度，并假定在这个柱的底部回收粗颗粒物，他们已经将正常的旋风集尘器改变为具有中央螺旋片的双旋风集尘（TCSR），这些变动的结果是最大粉碎颗粒尺寸（dmax）为8．2μm（破碎比：410～50）中间尺寸（d50）是1．03μm。
The KD-1 dry tower mill has been developed to be a new type of tower mill for KD-2 and KD-3, with a high recovery of fine particles of -10 μm size. The size, shape, and internal diameter of the grading columns of these mills differ in the crushing chamber, and the type of cyclone dust collector during collection is also different. In the KD-1 equipment crushing and grading operations occur in the same column. The alternative that has been envisaged in KD-3 is to reduce the gas flow rate in the staging column and assume that the coarse particles are recovered at the bottom of this column and they have changed the normal cyclone into a twin cyclone set with a central spiral As a result of these changes, the maximum dust particle size (dmax) was 8.2 μm (breaking ratio: 410 to 50) and the median size (d50) was 1.03 μm.