| 摘要 |
An environmentally attractive combustion system and process are provided with an efficient furnace (32, fig. 3) in a boiler train (34, fig. 11) equipped with a special set of burners (30, fig. 2) to completely combust fuel comprising rice hulls or other combustible material. Desirably, the furnace is designed and arranged to prevent the rice hulls or other combustible material from impinging, corroding, or otherwise damaging the furnace walls. An air heater (46, fig. 11) provides heated air with the fuel. A primary conduit provides a scroll pattern pathway (116, fig. 8) to pneumatically convey and swirl the heated fuel about the inlets of the burners. Impellers (138, fig. 9) mix secondary air comprising another portion of the heated air with the preheated fuel about the burners. The secondary air is regulated by an air register (144, fig. 8). Advantageously, the economical combustion system and process control the combustion temperature and residence time of combustion of the rice hulls or other combustible materials to minimize the formation of abrasive crystalline silicon dioxide. |
