With regard to the first phase project of Shaoxing Wastewater Treatment Plant(WWTP),the maintenance and reconstruction for cooling system of centrifugal blower were introduced.

High speed centrifugal blowers are key equipment in sulfuric acid production system with waste gases from zinc metallurgy.

Since centrifugal blower D900-2 5/0 97 was remaked with three dimensional,flow model,the blows raises from 900 m 3/min to 1 100 m 3/min,the exit pressure increases from 2 45×10 5 Pa to 2 94×10 5 Pa, the top efficiency advances from 78% to 82%.

The possibility and advantage of centrifuge basket made of fiber reinforced plastics were introduced.

On the principle of the similar theory,the similarity relations of stress of centrifugal basket were discussed by establishing the similari model.

The film stress and secondary stress were calculated and analysised by the mathematical method which is based on the classical elasticity methanics, in comparison to the result of the experiment, the distribution of stress of centrifugal basket was given and some conclusions were obtained.

Research on the influence of modality affected by main parameters of horizontal spiral centrifuge;