| OCR Text |
Show In the initial stage, w e used test burners lined with refractory. Later, w e found that this type of burner was not suitable because of excessively high combustion temperature yielded which made N O x emissions reduction difficult. Instead, w e used a water cooled burner. With this approach, w e could reduce N O x emissions. But it caused, in return, another problem of unstable flame. This cyclonic combustion is premixed natural gas/air combustion. W e found that uniform gas/air mixing is a very important factor to obtain low N O x emissions and flame stability. describes the present state of the test equipment. Further improvement is ) be necessarv This report considered to be necessary 2. Test equipment 2-1 Structure of test equipment The test equipment consists of five units, such as, burner, furnace, wet-back, heat exchanger and flue. Figure 1 shows its sectional view. Figure 2 is the longitudinal section view of the burner and furnace. However, w e think distinguishing the burner from furnace is difficult The outside of the burner and the furnace is water cooled 1600 WET BACK FIGURE 1. CROSS SECTION DRAWING OF TEST EQUIPMENT -2- |
