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Show 10 3. Development of the self-regenerative burner, the PAX-SR burner The PAX-R burner was developed with the main purpose for use with forge furnaces but due to economical and physical restrictions, it have become extremely difficult to apply such general twin systems using two burners as a set to small scale forge furnaces requiring burner capacity of 500 k W and less. Therefore, a compact and simple "self-regenerative burner", the PAX-SR which can make changeover combustion by one unit was developed for the main purpose of use with the above mentioned class small scale furnace. By this the application scope of regenerative burner systems was expanded. 3.1 The PAX-SR burner structure To solve problems in the application of twin systems such as mentioned above to small scale furnaces, innovations were made on the structure as mentioned below and as shown in Fig. 11. (D The inside of one burner was divided into two parts to enable changeover combustion by one unit. The structure was made to combine 2 units of the twin regenerative burner into 1 unit. By this, many auxiliaries including installing holes were cut by half, making it possible to reduce costs and save space substantially. (2) Regenerator element (alumina balls) contained inside the burner By containing the regenerator element inside the body, the wind box space is not merely filled with regenerator element but it became possible to make the lining insulation thickness thinner and make the external size smaller. Bars made of SiC are used for the retainer of the regenerator element whereby the bars are aligned parallel and by increasing the cross section for passage of air and exhaust, pressure loss at the retainer is minimized. (D Exclusive 4-way valve embodied with the burner The PAX-SR burner is for small scale furnaces and since it is assumed that they will be mainly used in single units, a 4-way valve was employed for the changeover system. An exclusive box shape valve was designed and by direct attachment to the burner body, substantial reduction in size and reduction of piping work man-hours was achieved. |