OCR Text |
Show performance below 200°C . 1bis means the compact burner can recover its exhaust gas heat effectivelY. An excellent for low NOx emission has also obtained for FFR-350 shown in Fig.13. al beina . . FFR 350s are so c FFR-700s have been already apphed to actual forge furnaces and operate consIstently well. - applied to heat treatment furnaces. We are continuing development with a small and large FFR with combustion rates of 150kW and 1500kW. 3.2 Super FDI The basic concept of the newly developed FDI regenerative burner mentioned earlier was to made the entire system into a compact unit, including the air nozzles, gas nozzles and regenerators, among others. The method ~e. call Super FDI completely differs from this and emphasis has been placed on the free positioning which is intnoSlC to the FDI. The basic concept is a further extension of the FDI. The positions of the gas nozzles and the air nozzles can be decided freely, in accordance with the objective of the furnace. This exceeds the framework of the technology to attain a low NOx and is aimed at free control of the flame inside the furnace. The word flame is used here, but at times it may be used as the reaction area which cannot be observed as a normal flame. Objective of the Super FDI The objective of the Super FDI is to control the heat transfer inside the furnace, as well as the atmosphere inside the furnace, through freely controlling the flame. One way to obtain a uniform temperature inside the furnace is to agitate the in-furnace gas through high velocity injection flow, represented by the high velocity burner In addition to this, Super FDI makes more distinct the slow burning which is unique to FDI combustion and so is expected to have the effect of eliminating heat spots inside the furnace. Moreover, if it is possible through some kind of method to grasp the low temperature areas and the high temperature areas, the heat distribution can be freely controlled by positioning the gas injection position, as necessary. In this case, there is absolutely no need to match the air nozzles and gas nozzles one to one, and only ultimately complete combustion should be confmned. It may become possible to realize a uniform temperature inside the furnace and to obtain high temperature at the designated points, as necessary. At the same time, this system will make it possible to separate the atmosphere inside the furnace into the oxidizing atmosphere part and the reducing atmosphere part. Of course, this system must have the low NOx nature of the FDI. Construction of the Super FDI It is believed that the Super FDI also has the highest realization nature for combining with the regenerative system. One reason for this is that a high temperature preheated air, the same as a regular FDI, can be obtained. Another important reason is that the regenerative system is of the alternative combustion type. The position of each nozzle of the Super FDI is not fixed. Rather, this is a unique method in which more nozzles than normally used are first arranged and then selected according to the condition inside the furnace in operation. Therefore, the regenerative system in which the supply of air can be changed as necessary has the potential for becoming a Super FDr throuoh simply making partial changes. An example of the arrangement of the nozzles of the Super FDI is shown in F~ 14. The Super FDI gas nozzles shown in the drawing may be selected at the ideal places, or a number can ~ positioned and controlled according to the condition inside the furnace. Compared to the air nozzles which injects a large volume of high temperature air, the FDI gas nOzzles is of simple construction and it is relatively easy to position the nozzles optionally. Therefore, after actually deci; very the arrangement of the air nozzles for each regenerator, the only thing necessary to do is to decide on the an ng on of the gas noz zl es w hil e conS}. den' ng th e c h aracten.stI.c s 0 f the f urnace. angement Test result of the Super FDI |