Atmospheric fluidized bed combustion for small scale market sectors. Final report

摘要

The objective of this project was to demonstrate and promote the commercialization of coal-fired atmospheric fluidized bed combustion (AFBC) systems, with limestone addition for SO(sub 2) emissions control and a baghouse for particulate emissions control. This AFBC system was targeted for small scale industrial-commercial- institutional space and process heat applications. A cost effective and environmentally acceptable AFBC technology in this size range would displace a considerable amount of gas/oil with coal while resulting in significant total cost savings to the owner/operators. In the Proof-of-Concept Phase, a 2.2 x 10(sup 6) Btu/hr unit was installed and successfully operated at Cedar Lane Farms (CLF), a commercial nursery in Ohio. The heat from the fluidized bed was used to heat hot water which was recirculated through greenhouses for cool weather heating. The system was designed to be fully automated with minimal operator attention required. The AFBC system installed at CLF was an improved design that incorporated flyash/sorbent reinjection and an underbed feed system to improve limestone utilization. With these additions it was possible to lower the Ca/S ratio from (approximately) 3.0 to 2.0, and still maintain an SO(sub 2) emissions level of 1.2 lb/10(sup 6) Btu when burning the same high sulfur Ohio coal tested at OARDC.