| OCR Text |
Show (1) The drafting force was insufficient because the chimney was low and pressure could not be maintain when recuperator is reinforced and pressure drop of the flue is raised, the exhaust gas of the high temperature spouts from the door, and the waste heat recovery rate decreases. (2) Heat resistance of the combustion air duct was 400°C and when the preheat air temperature was raised reinforcing recuperator, the update of the combustion air duct was needed. Therefore, the waste heat recovery reinforcement was not approved. On the other hand, waste heat recovery can be reinforced without above-mentioned problem by installation of regenerative burners, so it was planed to save fuel consumption rate of the furnace. 3.2.2 Problem on development The problems to install regenerative burners to furnace were as follows.: (a) reduction of NOx emission, (b) establishment of highly effective control system of regenerative burner with conventional burners to optimize waste heat recovery. These were assumed to clarify by preceding combustion experiment. Moreover, based on the experiment result, flexible temperature control system was discussed. 3.2.3 Combustion experiment To precede the installation to commercial operating furnace, to clarify the combustion characteristic, and reflect in the burner specification, the combustion experiment was done. 3.2.4 Experimental apparatus Fig. 13 shows the schematic and the specification of the experiment apparatus. The burner was 2,900kW which was 1/2 in the capacity of the commercial burner and one pair (two burners) was set up in parallel. Regenerator was high alumina ball of <|)19. Waste gas was able to exhaust not only from regenerator but also from the conventional flue. 2500- Combustion Air Fan Burner :2900kW Two Staged Combustion Type Regenerator Alumina Balls 019 1 ton Induced Draft Fan Fig.13 Schematic of experimental apparatus |
