scholarly journals Evaluation of potential uses for solid wastes from atmospheric pressure fluidized bed combustion of coal

1986 ◽  
Author(s):  
E E Berry ◽  
E J Anthony
Keyword(s):  
Fluidized Bed ◽  
Atmospheric Pressure ◽  
Solid Wastes ◽  
Fluidized Bed Combustion

Properties and Environmental Considerations Related to AFBC Solid Residues

1986 ◽  
Vol 86 ◽  
Author(s):  
E. E. Berry ◽  
E. J. Anthony
Keyword(s):  
Trace Elements ◽  
Fluidized Bed ◽  
Temperature Rise ◽  
Atmospheric Pressure ◽  
Alkaline Ph ◽  
Fluidized Bed Combustion ◽  
Dissolved Solids ◽  
Factors Influencing ◽  
Coal Ashes ◽  
Environmental Considerations

ABSTRACTAtmospheric-pressure fluidized bed combustion (AFBC) produces solid residues that are different from the familiar pulverized coal ashes. When limestone beds are used to adsorb SOx, high-Ca residues, comprised largely of CaO and SO4, are produced. Leachates from high-Ca AFBC residues are strongly alkaline (pH >11) and contain high levels of dissolved solids (TDS >3000 mg/L). If water is added during handling, hydration of CaO may cause a temperature rise and hydration of CaSO4 may result in premature hardening of the residues. Trace elements and organic components may leach from disposal sites. This paper presents an overview of the nature of AFBC residues and the factors influencing their disposal.

scholarly journals Characterization of solid wastes from circulating fluidized bed combustion

1989 ◽  
Author(s):  
E J Anthony ◽  
G G Ross ◽  
E E Berry ◽  
R T Hemings ◽  
R K Kissel ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Solid Wastes ◽  
Fluidized Bed Combustion ◽  
Circulating Fluidized Bed Combustion

Simultaneous CO2 and SO2 Capture at Fluidized Bed Combustion Temperatures

2005 ◽  
Author(s):  
P. Sun ◽  
J. R. Grace ◽  
C. J. Lim ◽  
E. J. Anthony
Keyword(s):  
Particle Size ◽  
Reaction Time ◽  
Fluidized Bed ◽  
Co2 Capture ◽  
Atmospheric Pressure ◽  
Pressure Range ◽  
Operating Conditions ◽  
The Other ◽  
Fluidized Bed Combustion ◽  
So2 Capture

Simultaneous carbonation and sulphation have been investigated to simulate non-calcining conditions at FBC temperatures (750–850°C) using an atmospheric-pressure thermogravimetric reactor (TGR) with up to 80% CO2 in the gas stream to extend the pressure range of applicability of the results. This investigation was undertaken to provide insight on simultaneous carbonation and sulphation and to provide knowledge relevant to FBC, including PFBC, operations. Two calcium-based sorbents (one limestone and one dolomite) were tested with particles of diameter 212–250 μm and 500–600 to determine the effects of operating conditions such as temperature, CO2 and SO2 concentrations, particle size and reaction time on the sorbent performance. SO2 was found to impede CO2 capture; on the other hand, CO2 enhanced the capture of SO2. The calcination rate was also observed to decrease as a result of the presence of the sulphate layer.

Utilization of Fluidized Bed Combustion in Energy Recovery from Solid Wastes

1980 ◽  
Vol 102 (3) ◽  
pp. 168-172 ◽  
Author(s):  
J. R. Hamm ◽  
D. L. Keairns
Keyword(s):  
Gas Turbine ◽  
Fluidized Bed ◽  
Energy Recovery ◽  
Combustion Process ◽  
Combined Cycle ◽  
Solid Wastes ◽  
Space Heating ◽  
Closed Cycle ◽  
Fluidized Bed Combustion ◽  
Near Term

Fluidized bed combustion is capable of utilizing a wider variety of fuels (including solid wastes) than is any other combustion process. Thus, it has the potential for wide application in systems for recovering energy from solid wastes in industry, commercial sites, institutions, forestry, and agriculture to produce electric power, process steam, process heat, and space heating. Three fluidized bed combustion concepts are identified for near-term application: atmospheric fluidized bed boiler, exhaust-heated gas turbine or combined cycle, and closed-cycle gas turbine.

The Uses and Morphology of Atmospheric Fluidized Bed Combustion Wastes From Canada’s First Industrial AFBC Boilers

1987 ◽  
Vol 109 (3) ◽  
pp. 148-154 ◽  
Author(s):  
E. E. Berry ◽  
E. J. Anthony ◽  
D. P. Kalmanovitch
Keyword(s):  
Fluidized Bed ◽  
Pollution Control ◽  
Prince Edward Island ◽  
Soil Stabilization ◽  
Solid Wastes ◽  
Canadian Forces ◽  
Fluidized Bed Combustion ◽  
Freezing And Thawing ◽  
Physical Tests ◽  
Bed Material

The literature of FBC solid wastes has been critically evaluated and solid wastes from Canada’s first atmospheric fluidized bed combustion (AFBC) boilers at the Canadian Forces Base (CFB) Summerside, Prince Edward Island have been investigated in order to determine possible uses for AFBC wastes. Scanning electron microscopy (SEM), electron microprobe, and chemical and physical tests were employed to determine the suitability of the material for pollution control, construction, and other uses. SEM and ancillary techniques have shown that the chemical and physical properties of the bed material and the elutriated streams are significantly different. Agricultural use, pollution control, soil stabilization (where freezing and thawing are not significant problems), asphaltic concrete, and specialized construction applications such as low strength backfill appear to be potential uses for FBC solid wastes.

Characterization of Solid Wastes From Circulating Fluidized Bed Combustion

1995 ◽  
Vol 117 (1) ◽  
pp. 18-23 ◽  
Author(s):  
E. J. Anthony ◽  
G. G. Ross ◽  
E. E. Berry ◽  
R. T. Hemings ◽  
R. K. Kissel
Keyword(s):  
New Brunswick ◽  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Pilot Scale ◽  
Full Scale ◽  
Operating Conditions ◽  
Solid Wastes ◽  
Fluidized Bed Combustion ◽  
Scale Unit

The characterization of solid wastes from full-scale circulating fluidized bed combustors (CFBC) is necessary to ensure that disposal procedures or utilization strategies for the waste solids are successful. Pilot plants are extremely useful in providing hydrodynamic heat and mass transfer data that can be used to design and predict the performance of larger units. Combustion studies indicate that data from pilot-scale units can be used to approximate the behavior of a full-scale plant for different fuels and operating conditions, even when the pilot plant is not designed to properly scale the commercial unit. However, the same does not seem to be true for the determination of reduced sulphur, the other is species and geotechnical or physical properties of the solid wastes generated from pilot plants. The results of analyses of samples generated from two units are discussed. One is a 150 by 150 mm square, 7.3 m high pilot-scale CFBC located at the University of British Columbia and 22 MWe CFBC located at Chatham, New Brunswick. This unit is operated by the New Brunswick Electric Power Commission (NBEPC). Both used the same New Brunswick coal containing 7 percent sulphur. The data presented indicate that the pilot-scale unit can significantly overpredict the formation of sulphides, and compared with the full-scale unit, produces residues with much less promise for either disposal or utilization in low-strength concretes. The results strongly suggest that further work is necessary to understand better the phenomena that produce sulphides and affect the geotechnical properties of wastes.

scholarly journals Emissions of SO3 from a Coal-Fired Fluidized Bed under Normal and Staged Combustion

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Wasi Z. Khan ◽  
Bernard M. Gibbs ◽  
Assem Ayaganova
Keyword(s):  
Fluidized Bed ◽  
Atmospheric Pressure ◽  
Fluidized Bed Combustion ◽  
Staged Combustion ◽  
Bed Height ◽  
Excess Air ◽  
Bed Temperature ◽  
Wide Range ◽  
Level 1 ◽  
Secondary Air

This paper reports the measurements of SO3 emissions with and without limestone under unstaged and staged fluidized-bed combustion, carried out on a  m2 and 2 m high stainless-steel combustor at atmospheric pressure. The secondary air was injected 100 cm above the distributor. SO3 emissions were monitored for staging levels of 85 : 15, 70 : 30, and 60 : 40, equivalent to a primary air/coal ratio (PACR) of ~0.86, 0.75, and 0.67. Experiments were carried out at 0%–60% excess air level, 1-2 m/s fluidizing velocity, 800–850°C bed temperature, and 20–30 cm bed height. During unstaged combustion runs, SO3 emissions were monitored for a wide range of Ca/S ratios from 0.5 to 13. However, for the staged combustion runs, the Ca/S ratio was fixed at 3. SO3 was retained to a lesser extent than SO2, suggesting that SO2 reacts preferentially with CaO and that SO3 is involved in the sulphation process to a lesser degree. The SO3 emissions were found to be affected by excess air, whereas the fluidizing velocity and bed temperature had little effect. SO3 was depressed on the addition of limestone during both the staged and unstaged operations, and the extent of the reduction was higher under staged combustion.

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