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Show 13 4. Development of a rotary type regenerative burner, the R R X burner Conventional regenerative burners require combustion changeover and therefore the system is not only complex, but problems of changes in internal furnace pressure and oxygen density are encountered. To solve these problems, a rotary type regenerative burner, the R RX burner was devised by Furnace Techno Co. For simplification and compacting which exceed those of the PAX-SR burner, w e are conducting joint developments with this company with the object of applying this burner on forge furnaces. 4.1 The RRX burner structure As mentioned above, to solve the problems of conventional regenerative burners, innovations were made in the structure of the R R X burner as mentioned below and also as shown in Fig. 15. © A rotary duct is built in the burner, and changeover of air supply and exhaust suction are made in succession. Continuous combustion is possible and can be used with combustion systems which are almost the same as those for conventional burners. Especially in the case of remodeling of existing systems, other than the exhaust fan, hardly any additional equipment is needed. Therefore remodeling costs made be held to a minimum. Also restriction of furnace pressure changes and stabilizing of oxygen density can be achieved. (D Use of honeycomb for the regenerator element A honeycomb regenerator element itself is more compact compared with a spherical regenerator element and also are of a structure which can be inserted inside furnace walls. Therefore the part which protrudes from the furnace may be made extremely small. Furthermore, since it is of the rotary type, changeover interval of air and exhaust of certain parts in regenerator is short, heat capacity of the regenerator element may be small, and may be made more compact compared to the honeycomb regenerator of the changeover type regenerative burner of the same capacity. For forge furnaces, a ceramic honeycomb is used for the high temperature side and a heat resistant metal honeycomb is used for the low temperature side in combination. ® Reduction of NOx by motive air The primary object of motive air is to prevent short pass of gas to exhaust. By this, the exhaust gas returning to the burner side is recirculated into the gas and reduction of N Ox emission may be made. |
