Oil shale CFBC ash cementation properties in ash fields

Pihu, T.; Arro, H.; Prikk, A.; Rootamm, R.; Konist, Alar; Kirsimäe, Kalle; Liira, Martin; Mõtlep, Riho

doi:10.1016/j.fuel.2011.08.050

Cited by 41 publications

(40 citation statements)

References 22 publications

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“…According to Mõtlep et al [40], the content of glassy (X-ray amorphous) phases in PF ash fractions varies from about 27% in the furnace ash to a maximum of 38% in the cyclone ash, and decreases sequentially in the electrostatic precipitator system from 28% in the first field and 23% in the second field to only 1-2% in the last field of electrostatic precipitators. In the CFBC ash, however, the content of the amorphous phase is about 10-15%, showing no significant variation between ash fractions [38].…”

Section: Comparative Characterisation Of Os Ash Formed In Pf and Cfbcmentioning

confidence: 89%

“…The different combustion conditions present in PF and CFBC technologies cause remarkable differences in phase and chemical composition between ash fractions [37,38]. Specifically, the sharp difference in the operating temperature and fuel particle size [3] results in the different behaviour of Ca-containing compounds (Figs.…”

Section: Comparative Characterisation Of Os Ash Formed In Pf and Cfbcmentioning

confidence: 99%

“…Today, almost 300 Mt of OS ashes is disposed of in such deposits. The OS ash handling system consists of three processes: (1) transportation of ash, (2) disposing of ash in ash fields, and (3) recirculation of the settled transportation water [38]. The transportation process includes the mixing of the ash collected from different points of the boiler gas pass with water at an ash-to-water ratio of 1:20.…”

Section: Deposition Of Os Ashmentioning

confidence: 99%

See 2 more Smart Citations

Open-Air Deposition of Estonian Oil Shale Ash: Formation, State of Art, Problems and Prospects for the Abatement of Environmental Impact

Kuusik¹,

Uibu²,

Kirsimäe³

et al. 2012

Oil Shale

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Section: Comparative Characterisation Of Os Ash Formed In Pf and Cfbcmentioning

confidence: 89%

Section: Comparative Characterisation Of Os Ash Formed In Pf and Cfbcmentioning

confidence: 99%

Section: Deposition Of Os Ashmentioning

confidence: 99%

See 1 more Smart Citation

Open-Air Deposition of Estonian Oil Shale Ash: Formation, State of Art, Problems and Prospects for the Abatement of Environmental Impact

Kuusik¹,

Uibu²,

Kirsimäe³

et al. 2012

Oil Shale

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“…[36]. More than 90% of oil shale ash is currently landfilled [38]. In landfills, it cements and binds approximately 8% of the total emitted carbon dioxide [39].…”

Section: Introductionmentioning

confidence: 99%

Ash and Flue Gas from Oil Shale Oxy-Fuel Circulating Fluidized Bed Combustion

et al. 2018

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Carbon dioxide emissions are considered a major environmental threat. To enable power production from carbon-containing fuels, carbon capture is required. Oxy-fuel combustion technology facilitates carbon capture by increasing the carbon dioxide concentration in flue gas. This study reports the results of calcium rich oil shale combustion in a 60 kW th circulating fluidized bed (CFB) combustor. The focus was on the composition of the formed flue gas and ash during air and oxy-fuel combustion. The fuel was typical Estonian oil shale characterized by high volatile and ash contents. No additional bed material was used in the CFB; the formed ash was enough for the purpose. Two modes of oxy-fuel combustion were investigated and compared with combustion in air. When N 2 in the oxidizer was replaced with CO 2 , the CFB temperatures decreased by up to 100 • C. When oil shale was fired in the CFB with increased O 2 content in CO 2 , the temperatures in the furnace were similar to combustion in air. In air mode, the emissions of SO 2 and NO x were low (<14 and 141 mg/Nm 3 @ 6% O 2 , respectively). Pollutant concentrations in the flue gas during oxy-fuel operations remained low (for OXY30 SO 2 < 14 and NO x 130 mg/Nm 3 @ 6% O 2 and for OXY21 SO 2 23 and NO x 156 mg/Nm 3 @ 6% O 2 ). Analyses of the collected ash samples showed a decreased extent of carbonate minerals decomposition during both oxy-fuel experiments. This results in decreased carbon dioxide emissions. The outcomes show that oxy-fuel CFB combustion of the oil shale ensures sulfur binding and decreases CO 2 production.

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“…Estonia has carried out many industrial-scale oil shale combustion experiments using different technologies. Compared to the more traditional pulverized firing (PF) furnace, the CFB furnace has several advantages such as satisfactory combustion efficiency, relatively low pollutant emissions and better adaptability [25][26][27][28][29][30][31]. CFB technology has been so far the most popular combustion method [22,28].…”

Section: Introductionmentioning

confidence: 99%

Exploitation and Utilization of Oil Shale in the Coal Measure Strata of the Haishiwan Mine, Yaojie Coalfield, China

CHEN¹,

Wang²,

Li³

2015

Oil Shale

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Oil shale, a kind of energy source, is an important alternative to petroleum. Considering the Haishiwan mine of the Yaojie coalfield, China, as a typical study case, an exploitation and utilization system for oil shale was investigated. The system consists of oil shale mining and comprehensive utilization. Haishiwan oil shale has developed in a paragenetic relationship with humic coal in coal measure strata. Underground mining technology is applied to the oil shale seam. The exploitation and utilization system for Haishiwan oil shale has a great significance for two reasons. On the one hand, combined with gas drainage technology, the mining of the oil shale seam can eliminate the risk of coal and gas outburst from the underlying coal seam in a particular area and ensure the safe mining of the coal seam. Thus the economic value of this thin oil shale seam is improved. On the other hand, the mined oil shale can be fully made use of by a comprehensive utilization technology. The latter includes oil shale retorting, combustion of semicoke, fine oil shale and fuel gases for power generation, and utilization of ashes for production of composite cement and other building materials. The industrial chain for oil shale exploitation and utilization established in the Yaojie coalfield is highly significant for maximizing the utility of resources and reducing environmental pollution.

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Oil shale CFBC ash cementation properties in ash fields

Cited by 41 publications

References 22 publications

Open-Air Deposition of Estonian Oil Shale Ash: Formation, State of Art, Problems and Prospects for the Abatement of Environmental Impact

Open-Air Deposition of Estonian Oil Shale Ash: Formation, State of Art, Problems and Prospects for the Abatement of Environmental Impact

Ash and Flue Gas from Oil Shale Oxy-Fuel Circulating Fluidized Bed Combustion

Exploitation and Utilization of Oil Shale in the Coal Measure Strata of the Haishiwan Mine, Yaojie Coalfield, China

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