Evolution of a conceptual design for a coal fired fluidized bed combustion furnace for a MIUS closed cycle gas turbine

In evolving the design of the gas-turbine power plant based upon a coal-fired fluidized bed combustion furnace, particular attention was given to the most critical component in the system, i.e., the fluidized bed furnace and heater assembly. Various layout arrangements of the economizer and recuperator relative to the fluidized bed were studied. Several configurations for the tubes in the heat transfer matrix of the bed and economizer were considered and the effects of differential thermal expansion on thermal stresses were analyzed. The possibility of tube vibration caused by either Karman vortex shedding or bed pulsation was examined. A relation between basic fluidized bed design parameters and the frequency of bed pulsations to be expected was derived in the course of this work. Particular attention was given to the accommodation of thermal expansion in the manifolds, piping, plenum chamber, and furnace support structure to minimize thermal stresses. Configurations were chosen that would limit the leakage of dusty air or combustion gas leakage to a sufficiently low level that the pumping power would not be increased significantly, and the furnace configuration was designed to limit heat losses to the engine room to less than 1% of the system output. The various air tuyere designs that have been tested by different organizations were examined, their problems noted, and one that seemed best suited to the MIUS application was chosen. Similarly, a variety of coal and limestone feed systems was considered and two were chosen for evaluation in bench tests of full scale components. The various tube and furnace configurations considered were examined from the standpoint of access for inspection and maintenance. A configuration has been evolved that seems to meet the many requirements reasonably well.. Authors: Tudor, J J. DOE Contract: W-7405-ENG-26. Subjects: 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 320603 -- Energy Conservation, Consumption, & Utilization-- Municipalities & Community Systems-- Public Utilities-- (1980-); 42 ENGINEERING; 421000* -- Engineering-- Combustion Systems; BURNERS; CARBONACEOUS MATERIALS; CHEMICAL REACTIONS; COAL; COMBUSTION; COMBUSTORS; CONFIGURATION; DESIGN; ENERGY LOSSES; ENERGY SOURCES; EXPANSION; FLUIDIZED-BED COMBUSTION; FLUIDIZED-BED COMBUSTORS; FOSSIL FUELS; FUEL FEEDING SYSTEMS; FUEL SYSTEMS; FUELS; GAS