Small Boiler Uses Waste Coal

摘要

Burning coal waste in small boilers at low emissions poses a considerable problem. Development has centered on the use of an internally circulating fluid bed (ICFB) boiler, which will burn waste fuels of most types. The boiler is based on the traditional D-shaped watertube boiler, with a new type of combustion chamber that enables a three-to-one turndown to be achieved. There's a cost advantage to the lower boiler height and with automated operation, the smaller plants are economically viable. Although the capital costs are admittedly greater, they are less than they used to be because of the use of the ICFB boiler. Its low height allows it to be built in a regular Butler-type prefabricated building; nearly all the hoppers and bins are built at regular fabricators locally and transported to site, as is the baghouse. Modern controls have greatly simplified the operation.