熔鉱炉排ガスの有効利用による省エネルギーについて
1979 年 95 巻 1098 号 p. 447-454
詳細
1979 年 95 巻 1098 号 p. 447-454
A substantial amount of energy have been saved by operating the blast furnace gas (LCV) burning power plant firstly built among the twelve ISP Smelters in the world.
Major characteristics of the power plant are summarized as:
1. Special firing technique for the LCV (low calorific value) gas in the boiler featuring:
1) A newly designed burner which enables the LCV gas of poor combustibility to burn both stably and continuously.
2) An oil burning pilot burner with a high turn-down ratio.
2. Pressure control technique for the LCV gas main to prevent the blast furnace and the boiler from undesireble pressure hunting.
3. An immediate turning-up technique for an oil burner in the case of emergency cut-off of a commercial line to supply sufficient power to an emergency line.
4. Supplemental firing of the oil burner to supply necessary amount of power and steam when the LCV gas volume sent to the power plant is insufficient.
5. An automatic by-passing procedure for process steam production in the case of turbine-trip.
6. Efficient anti-pollution measure (SOx and NOx reduction in the exit stack).
1) Mixed combustion of A and C grade oil. 2) Two step gas recirculation for NOx reduction. One- year operation of the plant has given the following results:
1. Power generated (average): 2000 kwh/h (20% of total demand of the smelter) Steam extracted: 5t/h
2. Effective prevention of pollution and any damage in the smelter to probably' be occurred in an emergency power stoppage.
