OCR Text |
Show 14 Exhaust Main air Regenerator element (honeycomb) Motive air (iGas Rotary duct Motor Fig. 15 Structure of the R R X burner 4.2 Performance, specifications Exhaust Main air • 0 Three models of the R R X burners with nominal capacities of 116, 232, and 460 k W are under development. Fig. 16 shows the approximate dimensions of the self-regenerative burner PAX-20N-SR with nominal capacity of 232 k W and the rotary type regenerative burner RRX-20N. The volume may be reduced to approximately 4 0 % of the former. Fig. 17 shows the exhaust heat recovery performance and data relating to NOx. NOx CO X 238 J-m\ E SB? 3fc «-2±* 600 ;s^ 520 # Self-regenerative burner PAX-20N-SR r-- CO - . i i- B B M V - " - ' - 1 " Main air 317 340 <-•H • Exha jst Rotary type regenerative burner RRX-20N Fig. 16 Comparison of approximate dimensions (2) 400 RRX-20N Combustion rate 232 kW P E Q. emission may be reduced as motive air pressure is 8 Q. increased but stable combustion at low C3 O E CD temperature becomes difficult and therefore motive - S 20° CO c O) o - u air pressure in normally limited to not more than 100kPa. CO CO o 1X1 O 100 0 I I Residue 0, Exhaust temperature 0a=0% converted NOx 12 1C 8 # o 6 S •g "S i 9 4 <r 2 4.3 Application test 800 900 1000 1100 1200 1300 Furnace internal temperature *C Fig. 17 Performance data of the R R X burner The present burner of 232 k W specification is currently being tested, mounted on a batch type forge furnace. This furnace was previously mounted with a recuperative burner but to promote energy savings, the burner was changed to the R R X burner. In making this change, the piping, auxiliary equipment, control panels, etc. used in the conventional system were all used as they were and other than the change of the burner, only a new exhaust fan and furnace pressure control valve were added. |