| OCR Text |
Show 14 5.2 ENERGY SAVING Comparisons of the specific energy consumption of the operations before and after the subject installation are shown in Fig.16. Average energy consumption was 4.1MJ/kg, and the furnace efficiency including flux treatment, holding time, etc. was 50%, while approx. 50% saving of energy was achieved comparing with the case before installed. 2500 r---~----r---r-----'---r---..., 10.5 ~---:------;~ I Pre-conversion I r! :::: _=I:::~:;~r-:::::~::~r~~::~::r::~~::::.:r::::::: :.: g ;: Q. : :: : : ...., .g § 1 000 .-- ----+---.. Q-.-+ ... - . --... ~ ... -... -..-- .-.-~.---... -.. -- 4.2 ~ Q.(J) CI) c:: t4--~: ------;: : b o (,) 500 '1 F 0 I Regenerative system ' 1... . ·-- , _ .. -.- 2.1 o 0 o 100 200 300 400 500 600 Melt rate kg/h Fig.16 Specific Energy Consumption 6. CONCLUSION By means of FDI combustion applied to the regenerative system, the NOx emission level of below 200ppm (02=0%) was achieved, at the furnace temperature of 1300°C and pre-heated air temperature of l000°C or more. As result of the installation the subject system to the box type forge furnace and also to the aluminum melting and holding furnace, the NOx level could greatly reduced with keeping the energy saving of 50%. Presently, field tests are under operation at reheat furnace, where a good results is marked. The more applications are scheduled to high-temperature treatment furnace and large car-bottom forge furnace. • |
