Through cold simulation test on cyclone preheater to find out the regular influence of operating parameter and structural data on the performance of preheater． The technical base and assistance for new cyclone preheater development is presented in the paper．

Hazardous waste usually brings great dangerous on human health and living environment． Due to it has sustained property, how to handle such wastes in an effective way becomes a new challenge to the people working in the field of environment protection and materials utilization． This paper shows the present technique of hazardous waste treatment and proposed that use special processing technique to treat hazardous waste in new dry cement production has a vast prospect of development．

Electrical equipment failures, such as insulation problem, aging, overload and virtual connection, can be reflected by watching temperature rise． It is important to adopt on－line temperature monitoring on electrical equipment in order to take precautions before hand to avoid incident caused by short circuit between line－to－line and phase－to－phase．