During these years,many technologies have been explored in terms of long-term operation,and a series of measures have been taken.

This paper introduced the application of some new-style antifriction materials in the sintering production equipments,which increased the operating cycle of the sintering equipment and saved the spare parts and maintenance fee.

Practices of prolonging running period of lime kiln;

Presents some practices and experiences to fulfill long term operation of ammonia plant, and proposes specific methods, such as compiling failure preventive scheme, scientific management and specific equipment management as well as in-situ safety management to fulfill long term operation of ammonia plant.

In the light of delayed coke operation in Petrochina Jinzhou Petrochemical Company,and in consideration of the major factors affecting the longterm operation of the coke,the purpose of reducing coking in furnace tubes,coke tower gas pipelines and fractionators were all analyzed.