THE DESIGN AND DEVELOPMENT OF A SMALL SCALE FLUIDIZED BED BOILER WITH AUTOMATIC CONTROL
This report describes the development of a small- scale automatic fluidized bed boiler. The boiler under development is nominally 25 kW output although the conceptual design was intended to meet the requirements for a hot water boiler in the size range up to 100 kW. The boiler has a number of novel features designed to secure: A wide range of turn-down ratio; great flexibility of response to load demand; high degree of automatic control; and ease of maintenance and operation. The design parameters have necessitated a fresh look at many of the fundamentals of fluidized beds in areas such as inhomogeneous fluidization, variable heat transfer rates, electric start-up, cheap actuators and sensors, automatic control, etc. The independent study of all of these elements of the design was carried out in cold (perspex) models. This was followed by the construction of a prototype boiler in which some operational experience was gained. It was found that the boiler could be started up with electric heaters provided that a rigid start-up procedure was adopted. It was found also that the boiler could be operated at high efficiency although departure from a narrow range of operating conditions caused greatly reduced efficiencies. Time did not permit for the construction of a second prototype boiler nor for the operation under full automatic control over extended time periods, but it is concluded that the chances of success of a boiler with these design criteria are very good.
Bibliographic Reference: EUR 10017 EN (1985), MF, 59 P., BFR 150, BLOW-UP COPY BFR 295, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989124045700 / Last updated on: 1987-01-01
Available languages: en