D210 LOW NOx COMBUSTION METHOD OF SLAG-TAP FIRING BOILER (TEILKAMMER BOILER)

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Slag-tap firing boiler (wet-bottom boiler : Teilkammer boiler), which is prevailing in West Europe, has a feature to dispose ash easily as a slag. In case of conventional slag-tap firing boiler combustion is completed before passing through the screen, that causes higher NOx emission level (500-600ppm), than conventional pulverized coal firing boiler (dry-bottom boiler : 200ppm). After oil crisis, many conventional pulverized coal firing boilers, which became popular, were built in Japan. These boilers discharge large amount of fly ash and it has been treated as cement-raw material or landfill. Nowadays, it is becoming harder to treat these great deal of fly ash due to various reasons. On the other hand, slag discharged from the slag-tap firing boiler is useful as a construction material and becomes in demand. So if slag-tap firing boiler has lower NOx emission, it must be popularized in Japan. This report shows the result of low NOx combustion test of 1.8MWth bench scale slag-tap furnace. New method is to move burnout air staging location from upstream side of slag screen to downstream side to gain reducing atmosphere in slag-tap zone. It was confirmed by the combustion test that NOx emissions become lower as the location of staging burnout air is far from the burner. When the residence time between burnout air staging location and burner was approx. three times that of the conventional pulverized coal-firing boilers, NOx emission was reduced to approx. 100ppm which is a half of conventional pulverized coal firing boiler.
一般社団法人日本機械学会の論文

D210 LOW NOx COMBUSTION METHOD OF SLAG-TAP FIRING BOILER (TEILKAMMER BOILER)

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