Thermodynamic analysis of pre-drying methods for pre-dried lignite-fired power plant

Liu, Ming; Yan, Junjie; Chong, Daotong; Liu, Jiping; Wang, Jinshi

doi:10.1016/j.energy.2012.10.026

Cited by 75 publications

(33 citation statements)

References 23 publications

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“…Many previous studies about the lignite pre-drying technology have focused on the comparisons of different types of dryers integrated with the power plant [7][8][9]. The analyses of the power plant efficiency improvements through using the steam lignite pre-drying have also been conducted [14,15].…”

Section: Introductionmentioning

confidence: 99%

“…Chou, and Prof. U. Desideri. as the energy utilization efficiency, has recently attracted a great deal of attention amongst the R&D and industry communities [7][8][9][10][11]. The performance analyses and comparisons of various drying technologies, e.g., hot air drying, combustion gases drying, or superheated steam drying, have also been comprehensively executed.…”

Section: Introductionmentioning

confidence: 99%

“…Kakaras et al [8] performed a computer simulation on plant thermal efficiency with steam-heated lignite dryers and concluded that the improvement in overall plant efficiency varied between 2% and 5%, depending on the water content of the raw coal and on the degree of pre-drying. Liu et al [9] developed a theoretical model based on the principle that pre-drying can increase the power plant efficiency and compared the thermodynamic performance of flue gas pre-drying and the steam pre-drying methods. A steam fluidized bed drying plant has operated several years at Loy Yang in Australia, supplying dried coal over 3 km to Loy Yang B power plant [10].…”

Section: Introductionmentioning

confidence: 99%

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An improved configuration of lignite pre-drying using a supplementary steam cycle in a lignite fired supercritical power plant

Cheng

Zhao

et al. 2015

Applied Energy

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h i g h l i g h t sAn improved lignite pre-drying using a supplementary steam cycle is proposed. Thermodynamic and economic analyses are quantitatively conducted. Lower exergy destruction and better matched energy level are obtained. Higher energy efficiency improvement and greater economic benefits are achieved. a b s t r a c tA novel concept of improved configuration of lignite pre-drying using a supplementary steam cycle incorporated in a lignite fired supercritical power plant was proposed in this study. Differing from the conventional lignite pre-drying power plant configuration, in this lignite pre-drying power plant (LPDPP) concept, the steam bleeds for the dryer and some regenerative heaters (RHs) are redirected from the high pressure turbines and low pressure turbines through a separate turbine named the Regenerative-turbine (R-turbine). With the R-turbine in place, the degree of super-heating of the bleeds for the dryer and for RH3-RH5 is significantly reduced, thus leading to a reduction in the heat transfer temperature difference and exergy destruction rate. The net energy efficiency and the economic benefits of the proposed LPDPP are also enhanced as compared to the conventional configuration. The analysis showed that, for a 600 MW supercritical LPDPP, the exergy destruction of the dryer could be reduced from 14.23 MW th in the conventional configuration to 13.25 MW th in the proposed design. The net energy efficiency could be further improved by 0.3 percentages points with a heat rate reduction of approximately 59.4 kJ/kW h. The net economic benefit of the proposed LPDPP could reach $47.6 M per year, which is $0.9 M greater than that of the conventional lignite pre-drying unit.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An improved configuration of lignite pre-drying using a supplementary steam cycle in a lignite fired supercritical power plant

Cheng

Zhao

et al. 2015

Applied Energy

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“…The table below quantifies the efficiency of each pre-drying method (27). (27) Evidently from the table above, there is already a desirable net efficiency improvement.…”

Section: Pre-dryingmentioning

confidence: 99%

“…The table below quantifies the efficiency of each pre-drying method (27). (27) Evidently from the table above, there is already a desirable net efficiency improvement. Also seen from the table above, fluidised bed dryers are far more effective at increasing efficiency when compared to different methods of air drying.…”

Section: Pre-dryingmentioning

confidence: 99%

A meta-study on the feasibility of the implementation of new clean coal technologies to existing coal-fired power plants in an effort to decrease carbon emissions

Davies

Malik

et al. 2017

PAMR

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The renewable energy sector has experienced an incredible growth in the last 15 years. The dependency on fossil fuel based power plants is still likely to continue well into the next half century. The global thermal efficiency of coal-fired power plants (CFPPs) since the 1980s has largely remained stagnant at 30-39% (high heat value basis)(2). Recent advances in materials and thermodynamics technologies has allowed for the efficiency of new pilot plants to be increased to 45%, even beyond 50% in some cases(3). The manufacture of these new highly efficient ultra-supercritical (USC) steam cycle CFPPs is an economically and politically difficult prospect. Therefore, it is necessary to investigates methods to apply the thermodynamic improvements available in modern USC CFPPs to the currently operating majority of subcritical (SubC) power plants without a large overhaul in infrastructure i.e. through retrofitting. This meta study will provide an analysis in the trends of the overall and intra-system efficiency of CFPPs, the development new clean coal technologies, then discuss and conclude the feasibility of applying these processes to current power plant infrastructure. A thermodynamic analysis of the most promising clean coal technologies, i.e. advanced pulverized coal combustion systems, oxy-fuel, pre and post-combustion carbon capture systems, steam reheat cycles, co-firing systems, will allow the investigation into whether retrofitting current power plants will generate a significant increase in efficiency. Thereby allowing for the discussion of the viability of retrofitting for the reduction in CFPP carbon emissions and the recommendation of specific options.

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Numerical and experimental study of temperature distribution on thermal plant coal mill walls

Kozić

Ristić²,

Katavić³

et al. 2017

Env Prog and Sustain Energy

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This article presents results of a numerical and experimental study of the temperature distribution inside and on the walls of the ventilation mill in the Kostolac B power plant, Serbia. This is very important because heat exchange between gas mixtures, ventilation mill walls and the environment, influences coal powder temperature, the combustion process, and the emission of greenhouse gases. The most complex multi-phase model in the Euler-Euler approach has been used through the ANSYS FLUENT code, for the numerical simulation of temperature distribution. Two ventilation mill models have been considered, one with zero wall thickness and the other one with steel walls, with and without insulation. An infrared thermographic camera was used for monitoring the temperature distribution on the outside wall of the ventilation mill housing, before insulator reparation, while after the reparation measurements were carried out at the selected points with infrared thermometer. The experimental results were used for verifying the results of the numerical simulation method as well as for detecting the damaged insulation.

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Thermodynamic analysis of pre-drying methods for pre-dried lignite-fired power plant

Cited by 75 publications

References 23 publications

An improved configuration of lignite pre-drying using a supplementary steam cycle in a lignite fired supercritical power plant

An improved configuration of lignite pre-drying using a supplementary steam cycle in a lignite fired supercritical power plant

A meta-study on the feasibility of the implementation of new clean coal technologies to existing coal-fired power plants in an effort to decrease carbon emissions

Numerical and experimental study of temperature distribution on thermal plant coal mill walls

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