Zero pilot fuel gas technology for BFG gas turbine

XIE Ying-hua1，TANG Ling2

（1. Hangzhou Steam Tarbine Co.，Ltd.，Hangzhou 310022，China；2. CECIC & SANFENG Energy Corporation，Chongqing 414100，China）

Abstract：Coke oven gas（COG） is usually used as pilot fuel gas for blast furnace gas（BFG） gas turbine. However，because of the limitation of COG purification process and instability of compression system，turbine easily break down，pilot COG fuel gas became a bottleneck for BFG GT good operation. In order to solve this problem，zero pilot fuel gas technology was applied to GT operation. That means，during GT operation，pilot COG was replaced by pilot BFG under certain conditions. The theory basis，new piping system，fuel calorie application range，operation condition，interlock protection，technological process and economic benefits to zero pilot fuel gas technology were analysed，and the test operation data of zero pilot fuel gas technology verified its feasibility. The experimental results indicate that zero pilot fuel gas technology for BFG gas turbine could reduce the GT fault rate because of pilot COG，and it could saving the lost of twenty million Yuan per year to the Gas Turbine user.