scholarly journals Oxygen Carrier Aided Combustion (OCAC) of Wood Chips in a Semi-Commercial Circulating Fluidized Bed Boiler Using Manganese Ore as Bed Material

2016 ◽  
Vol 6 (11) ◽  
pp. 347 ◽  
Author(s):  
Magnus Rydén ◽  
Malin Hanning ◽  
Angelica Corcoran ◽  
Fredrik Lind
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Oxygen Carrier ◽  
Wood Chips ◽  
Manganese Ore ◽  
Circulating Fluidized Bed Boiler ◽  
Bed Material

scholarly journals Oxygen Carrier Aided Combustion (OCAC) of Wood Chips in a 12 MWth Circulating Fluidized Bed Boiler Using Steel Converter Slag as Bed Material

2018 ◽  
Vol 8 (12) ◽  
pp. 2657 ◽  
Author(s):  
Magnus Rydén ◽  
Malin Hanning ◽  
Fredrik Lind
Keyword(s):  
Fluidized Bed ◽  
Alkali Metals ◽  
Circulating Fluidized Bed ◽  
Converter Slag ◽  
Oxygen Carrier ◽  
Point Of View ◽  
Wood Chips ◽  
Silica Sand ◽  
Ld Slag ◽  
Bed Material

The novel combustion concept Oxygen Carrier Aided Combustion (OCAC) is realized by addition of an active oxygen-carrying bed material to conventional fluidized bed boilers. The active bed material is meant to become reduced in fuel-rich parts of the boiler and oxidized in oxygen-rich parts, thus potentially providing advantages such as new mechanisms for oxygen transport in space and time. In this study, oxygen-carrier particles prepared from so called Linz-Donawitz (LD)-slag are examined as active bed material in a 12 MWth Circulating Fluidized Bed (CFB) boiler. LD-slag is the second largest by-product in steel making and is generated in the basic LD oxygen converter process. The experimental campaign lasted for two full weeks. The fuel was wood chips. LD-slag worked well from an operational point of view and no problems related to handling, agglomeration or sintering were experienced, albeit the production of fly ash increased. The boiler temperature profile suggested that fuel conversion in the main boiler body was facilitated, but the effect did not readily translate into reduced emissions from the stack. Spraying an aqueous solution of ammonium sulphate directly into the cyclone outlet with the aim of rejecting alkali metals as alkali suphates was found to solve the problems related to carbon monoxide emissions, suggesting that the problems could be due to the poor ability of LD-slag to absorb certain ash components. Use of a mixed bed consisting of 10–50 wt% LD-slag, with the remaining part being silica sand for ash absorption, also worked well. It is concluded that LD-slag could be a very cheap and readily available oxygen-carrying bed material for use in fluidized bed applications.

Using an oxygen-carrier as bed material for combustion of biomass in a 12-MWth circulating fluidized-bed boiler

Fuel ◽  
2013 ◽  
Vol 113 ◽  
pp. 300-309 ◽  
Author(s):  
Henrik Thunman ◽  
Fredrik Lind ◽  
Claes Breitholtz ◽  
Nicolas Berguerand ◽  
Martin Seemann
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Oxygen Carrier ◽  
Circulating Fluidized Bed Boiler ◽  
Bed Material

Ash Properties of Ilmenite Used as Bed Material for Combustion of Biomass in a Circulating Fluidized Bed Boiler

2014 ◽  
Vol 28 (12) ◽  
pp. 7672-7679 ◽  
Author(s):  
Angelica Corcoran ◽  
Jelena Marinkovic ◽  
Fredrik Lind ◽  
Henrik Thunman ◽  
Pavleta Knutsson ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Circulating Fluidized Bed Boiler ◽  
Bed Material

Mechanisms of Bed Material Agglomeration in a Petroleum Coke-Fired Circulating Fluidized Bed Boiler

1998 ◽  
Vol 120 (3) ◽  
pp. 215-218 ◽  
Author(s):  
B.-J. Skrifvars ◽  
M. Hupa ◽  
E. J. Anthony
Keyword(s):  
Fluidized Bed ◽  
Petroleum Coke ◽  
Circulating Fluidized Bed ◽  
Solid Particles ◽  
Circulating Fluidized Bed Boiler ◽  
Neck Growth ◽  
Heat Treated ◽  
Gas Atmosphere ◽  
Bed Materials ◽  
Bed Material

Petroleum coke firing in a circulating fluidized bed boiler has sometimes been reported to be associated with cyclone deposit problems and return leg plugging. In this paper, we present data which indicate that some of these problems may be due to the calcium-rich bed material used during the firing. We have earlier shown that calcium oxide may react with the flue gas components SO2 or CO2, causing neck growth between the solid particles. This neck growth between particles may lead to both deposits in the cyclone and plugging of the cyclone return leg. In this study we made use of a sintering testing method, based on compressive strength tests of heat-treated cylindrical pellets. Laboratory-prepared petroleum coke ash was mixed with two potential bed materials, limestone and dolomite, and sintering tests were performed in three different gas atmospheres. Significant differences were found between the mixtures as a function of both the gas atmosphere and temperature. We also performed thermogravimetric analyses on one of the bed materials, the limestone. Based on these results a mechanism for the formation of cyclone deposits and bed material agglomeration in the return leg was suggested.

The effect of circulating fluidized bed boiler load on the emission of mercury

2019 ◽  
Vol 92 (6) ◽  
pp. 1800-1806 ◽  
Author(s):  
Michał Wichliński ◽  
Grzegorz Wielgosz ◽  
Rafał Kobyłecki
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Circulating Fluidized Bed Boiler ◽  
Boiler Load

Modeling of solid fuels combustion in oxygen-enriched atmosphere in circulating fluidized bed boiler

2010 ◽  
Vol 91 (3) ◽  
pp. 290-295 ◽  
Author(s):  
Jaroslaw Krzywanski ◽  
Tomasz Czakiert ◽  
Waldemar Muskala ◽  
Robert Sekret ◽  
Wojciech Nowak
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Solid Fuels ◽  
Circulating Fluidized Bed Boiler

Combustion adjustment test of circulating fluidized bed boiler

2017 ◽  
Vol 124 ◽  
pp. 1505-1511 ◽  
Author(s):  
Guoli Qi ◽  
Songsong Zhang ◽  
Xuemin Liu ◽  
Jian Guan ◽  
Yongqiang Chang ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Circulating Fluidized Bed Boiler ◽  
Adjustment Test
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