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Show To verify the lo~ NOx .nature witlch is the premise of the Super FDI, we first measured the NOx characteristics of the Super FDI. FIg. 15 IS a drawulg of the test apparatus while Fig. 16 shows the NOx measurement. Basically the NOx level is practically the same regardless of the arrangement. Only when the mixture of the air and the gas is speeded up consciously a comparatively high NOx value near that of th~ normal FDI appears. 4. Computer Simulation on the FDI As a low NOx is realized using the furnace as a whole with the FDI combustion, the effects of the construction of the furnace is very large. Therefore, rather than considering only the combustion it will be necessary to employ a design method in accordance with the construction of the furnace when popularizing the FDI combustion. It is expected that the next age will pe one in which not only the FDI but also an ideal combination of the furnace construction and combustion is used to obtain maximum efficiency. We have, therefore, made full use of a simulation of the heat transfer within the furnace and have also taken in hand the development of an evaluation method for the condition inside the furnace. In detail, while increasing the accuracy of the simulation of the in-furnace gas flow. as well as the heat transfer. through calculating a large number of other cases. we have been able to accumulate wrique know how on industrial furnace engineering. This know how includes everything from modeling of the furnace and the flame, to the calculation method and evaluation of the calculation results. In Fig. 17 is shown the results of the calculations made at the time of using the FDI regenerative system for the batch type forging f umace. At present. although various kinds of calculations are being made generally on the furnace design. simulation of the in-furnace gas flow as well as heat transfer has rarely been made practically because of its enormous volume of calculations. We are making further development toward the integrated type calculation environment for industrial furnace engineering around the in-furnace gas flow and heat transfer simulation. FDI is one of the best subject matters for the environment. Conclusion An introduction was made on test results combining the FDI with the regenerative system. as well as in actual fuma{:t!s. Our basic data shows an extremely high NOx reduction effectiveness of FDI combustion compared to conventional combustion using high temperature preheated air. In almost all cases, it was confirmed that a NOx level lower than that with the test furnace could be obtained with actual furnaces. Secondly. the FFR was introduced as an new generation FDI. which can be operated for low temperature furnaces. Low NOx characteristics were demonstrated also. Third, an introduction was made on the concept of Super FDI which is an even further advancement on the concept of the fUI concept. Test results show a superior low NOx rate. Also mentioned was the possibility of a method for freely distributing the temperature within the furnace. Finally, an approach to a design method was shown making a full use simulation of furnace interior, which is indispensable for the popularization of the FDI. Our stance for the future is to create an integrated type calculation environment based on enQineerino and centered around a higher level of simulation than that up to now. o 0 Reference [1] T.Sugiyama, I.Nakamachi. K.Ohgi, T.:"J'agata, "Development of Low NOx Combustion Technique for High Temperature Furnace", Proc. of the 9th Members Confe~ence(19~) ' " [2] N . Sat' ki • T.K OI' ZUID.l . "Application of Low-NOx CombustIon Technique for RegeneratIve System. Proc. of AFRC/JFRC Pacific RIM International Conference of Environmental Control of Combustion Pr(K)esses(I~4) |
