| 1. |
- Andersson, Bengt-Åke, et al.
(författare)
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Fluidized bed combustion of coals and alternative fuels
- 1985
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Ingår i: Proc of the 8th International Conference on Fluidized-Bed Combustion held in Houston Texas USA, March 18-21, 1985. ; 2, s. 1019-1029
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Konferensbidrag (refereegranskat)abstract
- The 16 MW demonstration plant at Chalmers University of Technology was designed to burn coal but measures were taken also to allow the use of alternative fuels. Results of comparative tests, with bituminous coal and alternative fuels, brown coal, peat, and wood chips, are presented. The combustion characteristics of the various fuels are illustrated with temperature and heat flux profiles in the freeboard. It is found that the volatile fuels tend to burn to a large extent above the bed and secondary air is necessary to complete the combustion. However, -if secondary air is used, a combustion efficiency close to 100% is easily obtained. Bituminous coal, on the other hand, does not readily burn with a high combustion efficiency in the boiler used.
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| 2. |
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| 3. |
- Andersson, Bengt-Åke, et al.
(författare)
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Particle mass flux in the freeboard of a fluidized bed boiler
- 1989
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Ingår i: Powder Technology. - 1873-328X .- 0032-5910. ; 58:1, s. 25-37
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Tidskriftsartikel (refereegranskat)abstract
- The flux of descending particles has beenmeasured in the freeboard of a fluidized bedboiler. The lateral and vertical distributionsof the flux were studied and the influence ofthe superficial gas velocity and the static bedheight analyzed. A tube bundle located in thebed surface region made it possible to investigatethe effects of tubes on the entrainmentof particles from the surface of the bed.The particle flux was relatively constantacross the freeboard except near the wall,where it was about twice as large as the average.In the vertical direction, the flux decreasedexponentially with height exceptclose to the bed, where the rate of decay wasless than at higher elevations. The tube bundlewas found to inhibit the splashing of bedparticles when the bed is below the tubes.A model is used for the estimation of thevertical particle flux and concentrationprofiles in the freeboard. It is based on separatetreatment of small and coarse particlesand calculation of trajectories of ejected bedparticles. The calculated freeboard valuesdescribe the experimental data satisfactorilyexcept close to the bed, where a considerablediscrepancy is observed.
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| 4. |
- Andersson, Bengt-Åke, et al.
(författare)
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Use of a conductivity heat-flow meter in fluidised-bed boilers
- 1989
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Ingår i: Transactions of the Institute of Measurement and Control. - : SAGE Publications. - 1477-0369 .- 0142-3312. ; 11:2, s. 108-112
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Tidskriftsartikel (refereegranskat)abstract
- The usefulness of a conductivity type of heat-flow meter for measurements in fluidised-bed boilers is investigated. The design and the calibration of the meter are described. Results from measurements of the local heat tranfer at the walls of fluidised-bed boilers are presented. An error analysis shows that the accuracy of the heat-flow meter is +-9%.
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| 5. |
- Johnsson, Filip, 1960, et al.
(författare)
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Pressure distribution and particle concentration in bubbling fluidized beds
- 1989
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Ingår i: Proc of the 6th International Conference on Fluidization. - 0816904596 ; 6, s. 419-426
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Konferensbidrag (refereegranskat)abstract
- The expansion of and particle concentration in large-particle (>0.5 mm) bubbling beds, fluidized at high gas velocities (U-Umf>1 m/s) have been studied in a boiler with 10 m2 hot bed and in a cold two-dimensional bed. The significantly different behaviour of a freely bubbling versus a tube-filled bed at high gas velocity is demonstrated.
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