| 1. |
|
|
| 2. |
- Johnsson, Filip, 1960, et al.
(author)
-
Fluidization regimes in boilers
- 1995
-
In: Preprints of Fluidization VIII. ; , s. 129-136
-
Conference paper (other academic/artistic)abstract
- The fluid dynamics were studied in a fluidized bed boiler and in two laboratory fluidized beds under ambient conditions. The beds had different geometries but were all of a non-slugging type operated with Geldart Group B and D particles. The bed geometry was found to strongly influence the fluid dynamics of the bed.
|
|
| 3. |
- Johnsson, Filip, 1960, et al.
(author)
-
Fluidization regimes in fluidized bed boilers
- 1992
-
In: Proc of the 7th Engineering Foundation Conference on Fluidization. - 0939204479 ; 7, s. 471-478
-
Conference paper (peer-reviewed)abstract
- The fluidization regime of the bottom bed has been investigated in a circulating fluidized bed at ambient temperature. A few measurements have also been made in a 12 MWth CFB boiler at normal operation temperature. It was found that the bottom bed was of a bubbling type for all conditions studied.
|
|
| 4. |
- Johnsson, Filip, 1960, et al.
(author)
-
Optical and momentum probe measurements in a CFB boiler
- 1996
-
In: Proc of the 5th International Conference on Circulating Fluidized Bed. ; , s. 652-657
-
Conference paper (peer-reviewed)abstract
- Methods for the characterization of the two-phase flow in the transport zone of circulating fluidized bed (CFB) boilers are discussed based on measurements of fluctuations in local solids concentration and momentum flux using an optimum probe and a momentum probe. Both probes were designed to withstand the environment inside a furnace during combustion. The dynamic information on the flow obtained by the two probes was in agreement. The time-resolved measurements in the core region as well as in the wall layer by continuous increases and decreases in solids concentration and momentum flow from a base level at low solids concentration.
|
|
| 5. |
|
|
| 6. |
- Kjärstad, Jan, 1956, et al.
(author)
-
Transforming the energy system in Västra Götaland and Halland – linking short term actions to long term goals
- 2015
-
Reports (other academic/artistic)abstract
- This study analyzes pathways to meet EU, national and regional targets for CO2 emissions, energy efficiency and penetration of renewable energy in the Swedish part of the Kattegat-Skagerrak region (KASK-SE), i.e. more specifically in the counties of Västra Götaland (VGR) and Halland. Special focus is placed on four areas: The potential for energy savings in the building sector, energy savings and fuel shifting in the energy intensive industry, large-scale deployment of renewables in the electricity generation sector and greenhouse gas emission reductions in the transport sector. The energy savings are through the implementation of different energy efficiency measures.
|
|
| 7. |
- Svensson, Anders, 1960, et al.
(author)
-
Bottom bed regimes in a circulating fluidized bed boiler
- 1996
-
In: International Journal of Multiphase Flow. - 0301-9322. ; 22:6, s. 1187-1204
-
Journal article (peer-reviewed)abstract
- This paper extends previous work on the fluidization regimes of the bottom bed of circulating flyidized bed (CFB) boilers. Pressure measurements were performed to obtain the time-average bottom bed voidage and to study the bed pressure fluctuations. The measurements were carried out in a 12 MWth CFB boiler operated at 850°C and also under ambient conditions (40°C). Two bubbling regimes were identified: a “single bubble regime” with large single bubbles present at low fluidization velocities, and, at high fluidization velocities, an “exploding bubble regime” with bubbles often stretching all the way from the air distributor to the surface of the bottom bed. The exploding bubble regime results in a high through-flow of gas, indirectly seen from the low average voidage of the bottom bed, which is similar to that of a stationary fluidized bed boiler, despite the higher gas velocities in the CFB boiler. Methods to determine the fluidization velocity at the transition from the single to the exploding bubble regime are proposed and discussed. The transition velocity increases with an increase in particle size and bed height.
|
|
| 8. |
|
|
| 9. |
- Svensson, Anders, 1960, et al.
(author)
-
Fluidization regimes in non-slugging fluidized beds: the influence of pressure drop across the air distributor
- 1996
-
In: Powder Technology. - 1873-328X .- 0032-5910. ; 86:3, s. 299-312
-
Journal article (peer-reviewed)abstract
- The purpose of the present work is to study the influence of the pressure drop across the air distributor on the bubbling conditions of thebottom bed of circulating fluidized beds (CFB). The bottom bed is the dense bubbling zone just above the distributor. The experimental workwas carried out in a 12 MWm CFB boiler and in a cold CFR Three different distributions of the bubble flow in time and space, termedfluidization regimes, were identified in the cold CFB: the multiple bubble regime with many small bubbles evenly distributed in the bed; thesingle bubble regime, characterized by the presence of only one bubble at a time in the bed; and the exploding bubble regime with large,single, irregular voids stretching from the air distributor to the bed surface. These bubbling conditions were observed during variations in thegas velocity and the distributor pressure drop. A comparison with the 2 mz cross-section CFB boiler showed that the boiler always operatesin the single or in the exploding bubble regime, which indicates a bubble flow that is not continuous and not well distributed over the crosssectionof the bed. The conditions in the boiler are influenced by the relatively large area of gas passage and the low pressure drop of theboiler air distributor.
|
|
| 10. |
|
|
