Utilization of pyrolytic wastewater in oil shale fired CFBC boiler

Konist, Alar; Järvik, Oliver; Pikkor, Heliis; Neshumayev, Dmitri; Pihu, T.

doi:10.1016/j.jclepro.2019.06.213

Cited by 16 publications

(6 citation statements)

References 21 publications

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“…%) than that of the other OSAs. Furthermore, the composition of OSA is close to the Estonian oil shale ash [10,11]. Table 1 shows the physical test values of OSA as conducted in accordance with the CSA A3001 [12].…”

Section: Methodsmentioning

confidence: 99%

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Evaluation the Effect of Adding Oil Shale Ash on the Compressive Strength of Concrete

Gougazeh¹

2022

Adv. Sci. Technol. Res. J.

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In the present study, the effect of cementing properties of oil shale ash on the compressive strength of the concrete mixtures produced from oil shale ash, cement, sand, and water was investigated. The used shale ash was produced by direct combustion at 830°C in a laboratory muffle furnace of the El-Lajjun oil shale. Based on the chemical composition of shale ash (OSA), it was concluded that this material consists of a high percentage of CaO which forms the properties of cement materials as well as the contents of SiO 2 , Al 2 O 3 , and Fe 2 O 3 form the properties of pozzolanic materials. Oil shale ash (OSA) materials have diverse applications as alternative materials for the construction industry and construction technology to reduce environmental risks and achieve sustainability. The results showed that the pressed specimen with 40 wt.% OSA content, 50 wt.% sand content and 30% MW obtained the highest compressive strength of about 9.1 MPa after 28 days of hardening. The highest value of 28 days compressive strength for a compacted specimen containing 35 wt.% OSA and 35% MW were achieved with 12 MPa at a compaction pressure of between 25 and 30 MPa. High compressive strength values were found to be achieved in the compressed specimens by controlling mixing water. It is also indicated that the compressive strength increases as OSA content in the compressed specimen increases and increases as compaction pressure increases.

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Section: Methodsmentioning

confidence: 99%

“…This study Estonia [10] China [13] Colorado [13] Germany [13] specimens in the laboratory were prepared and cast as 45 mm mortar cubes, the specimens were kept and remolded after 24 hours. The compacted specimens were made of mixtures of OSA to silica sand (the used silica sand was ground to 920 cm 2 /g).…”

Section: Occurrencesmentioning

confidence: 99%

Evaluation the Effect of Adding Oil Shale Ash on the Compressive Strength of Concrete

Gougazeh¹

2022

Adv. Sci. Technol. Res. J.

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“…In Estonia, for instance, most of its electricity is produced by oil shale-fired power plants. 3 One way to reduce CO 2 emissions from such power plants is to use pure oxygen along with recirculated flue gas in the combustion instead of air. This type of combustion produces flue gas with a high concentration of CO 2 , which can then be more easily captured and stored to reduce emissions.…”

Section: Introductionmentioning

confidence: 99%

“…To avoid negative climatic effects caused by global warming, the amount of anthropogenic CO 2 emitted to the atmosphere must be reduced. , However, currently the majority of the world’s energy needs are still supplied by fossil fuels. In Estonia, for instance, most of its electricity is produced by oil shale-fired power plants . One way to reduce CO 2 emissions from such power plants is to use pure oxygen along with recirculated flue gas in the combustion instead of air.…”

Section: Introductionmentioning

confidence: 99%

Mineral and Heavy Metal Composition of Oil Shale Ash from Oxyfuel Combustion

et al. 2020

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Oxyfuel combustion can reduce CO 2 emissions from fossil fuels. Hence, it is currently being investigated for potential use in oil shale-fired power plants, which currently produce most of Estonia’s electricity. Here, experiments were performed with kukersite oil shale for both oxyfuel and conventional combustion in a 60 kW th circulating fluidized bed combustor. In this paper, we provide data on the ash composition including mineral compositions and heavy metal concentrations. Oxyfuel conditions did not noticeably influence the concentrations of heavy metals in the ash but did have significantly lower amounts of free lime because of inhibition of the carbonate decomposition reactions. The results suggest that oxyfuel combustion would produce no significant problems in terms of the behavior of the ash or the fate of heavy metals contained in the ash.

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“…This technology offers wide fuel adaptability, high combustion efficiency, high efficiency desulfurization, low nitrogen oxide emissions, a wide range of load regulation, and other superior performances [2,3]. CFB technology has paved the way for the large-scale utilization of inferior coal and coal washing wastes [4]. CFB has become the best method for the large-scale utilization of low-calorific value fuels in China, and it is suitable for the current ultra-low emissions and thermal power peak shaving requirements.…”

Section: Introductionmentioning

confidence: 99%

Study on Dynamic Characteristics of Residual Char of CFB Boiler Based on CPFD Method

Shen

Wang

et al. 2020

Energies

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When the load of Circulating Fluidized Bed (CFB) boiler changes dynamically, the accumulation and consumption of residual char causes a large inertia and hysteresis in the boiler combustion system. Therefore, accurate estimation of the residual char in the boiler is of great significance to the control system and improve the combustion efficiency. Based on the Computational Particles Fluid Dynamics (CPFD) method, a numerical simulation of the variable load process of CFB boiler was carried out, and the dynamic changes of the residual char inventory were analyzed by combining the coal feed, ash discharge, and furnace calorific value. The results showed that after CFB boiler reached stable operation, the residual char fluctuated from 11,000 kg to 16,000 kg, accounting for about 3.7% of the total bed material, and the residual char was in a dynamic balance. During the load-up phase, the average residual char was 17,500 kg, and during the load-down phase, the average residual char was 15,000 kg. In the process of load dynamic change, reasonable residual char stock can ensure the boiler load from one steady state to another steady state rapid transition.

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Utilization of pyrolytic wastewater in oil shale fired CFBC boiler

Cited by 16 publications

References 21 publications

Evaluation the Effect of Adding Oil Shale Ash on the Compressive Strength of Concrete

Evaluation the Effect of Adding Oil Shale Ash on the Compressive Strength of Concrete

Mineral and Heavy Metal Composition of Oil Shale Ash from Oxyfuel Combustion

Study on Dynamic Characteristics of Residual Char of CFB Boiler Based on CPFD Method

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