A furnace body cooling loss calorific value Qlr is determined based on a flow rate Gw of cooling water flowing in a furnace body and a furnace cover, the inlet temperature Twi and the outlet temperature Two, and a plasma output correction value Qps1 is determined based on these values. 炉体及び炉蓋を流通する冷却水の流量Gw、入口温度Twi及び出口温度Twoに基づいて、炉体冷却損失熱量Qlrを求め、これに基づいてプラズマ出力補正値Qps1を求める。 - 特許庁