The contact pattern of boiler auxiliary machinery was modified with the adoption of layer-by-layer coal charging technology,realizing secondary dedusting,improving the heat efficiency and reliability of boiler.

Appropriate choice of top draft hood type is a key point for the modification project of secondary dedusting of converter off-gas at Xingtai Steelmaking Plant.

The re-deleting procedure utilizing the second order sensitivity is a feasible algorithm that is a trade-off between efficiency and accuracy.

The preparation of solution for derustiny, degreasing and phosphorizing steel;

ln this paper, the basic principle of automatic computer recognition of derusting grade of steel plate is proposed and studied, First, image information of derusted steel plate is taken by CCD picture pick -up device, then, shade of grey and oolor are digitized, images are carved up and contrasted, and the texture and structure are analysed.