OCR Text |
Show TABLE 2. FIRETUBE BOILER TEST DATA Emissions (ppmv) NO, Fiber Burner A 41 Baseline Burner (as Received) 60 CO 17 16 UHC <l 15 Efficiency 64 83 Firetube Exit Temperature <* (°F) 1050 (1425) 1235 (1760) at the firetube exit, just before entering the second pass of the boiler, is substantially lower for the fiber burner, indicating that more radiation heat transfer is occurring. Thus, fiber burners offer potential for increased capacity in the same size boiler. The preliminary data appears \/ery promising, and further testing with both Burners A and B will further verify the low NO potential in firetube boilers. CONCLUSIONS The fiber matrix burner concept for low NO emissions has been demonstrated in a gas-fired firetube boiler. During the program, two successful fiber matrix materials were identified, and the fiber burner operating range was defined. Preliminary demonstration data shows that fiber burners reduce NO by up to 85 percent from the baseline NO of the as-received boiler. The x x radiative nature of the burner may also be responsible for a slight increase in boiler efficiency. Additional test data will be obtained for both Burners A and B in the following months. The burner demonstrating the best performance characteristics will then be selected for a cyclical life test of several hundred hours duration. This final demonstration will verify the low NOx» high efficiency operation of the burner with sufficient durability for boiler application. 3-8 |