小名浜製錬所における代替燃料利用技術の確立

抄録

The Onahama Smelter and Refinery has two green charged reverberatory furnaces and had been consuming 7, 000kl oil per month.
Repeated and high rise of oil price caused the Onahama Smelter and Refinery to introduce the alternative fuels.
Firstly, chipped waste tires have been burned in the reverberatory furnaces since Oct. 1979, saving oil consumption by20%.
Then pulverized coal combustion has been carried out since Aug., 1980.
Further, technique of waste tire pyrolysis was developed and established, replacing the fuels at anode furnaces and secondary air preheaters for the reverberatory furnaces with the oil and gas from the tire pyrolysis.
As a result, more than 95% of oil consumption is replaced with these alternative fuels.
Some problems occurred while using alternative fuels.
For example, reverberatory furnace dust was increased by the ash from coal and caused some problems. They were solved by injecting the dust through tuyeres of P. S. converters with compressed air.
Another main problem was the increase of reverberatory furnace off-gas, and it was solved by the improvement of absorption towers of off-gas treatment facility.
On the other hand, much more electric power is generated at the power station using increased steam from reverberatory furnace boilers.
In summary, cost of fuels and electric power is saved by introducing alternative fuels, and competitive reverberatory furnace smelting is now established.