Using pre-drying technology to improve the exergetic efficiency of bioenergy utilization process with combustion: A case study of a power plant

Liu, Ming; Zhang, Xuwei; Han, Xinyan; Li, Gen; Yan, Junjie

doi:10.1016/j.applthermaleng.2017.08.156

Cited by 16 publications

(5 citation statements)

References 27 publications

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“…Fuel pre-drying could significantly decrease the exergy loss in the combustion process. For equal heat exchange process in the boiler, the exergy efficiency could be increased by percentage points in comparison to conventional direct biomass usage in a power plant [10]. Moreover, pre-drying of biomass reduces the mass flow rate of fuel needed for the desired boiler output, which has an impact on fuel transport and storage, as well as the flow rate of combustion air and flue gas and the boiler size [8].…”

Section: Introductionmentioning

confidence: 99%

Drying Biomass with a High Water Content—The Influence of the Final Degree of Drying on the Sizing of Indirect Dryers

2022

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This article deals with the influence of the final drying degree of moist biomass used as fuel in a power or CHP plant on indirect dryer sizing. For a description of the drying process, experiments with wet bark containing approx. 50 wt% of water were carried out in a laboratory indirect dryer. A new parameter called drying effectivity was introduced, whose size varies according to the degree of biomass being dried. Its maximum value corresponds to the optimal biomass drying, when the relative size of the indirect dryer to evaporate the required mass of water from the biomass would be smallest. Based on the experimentally determined drying characteristics of wet bark, the optimal drying of 13 wt% of water content was evaluated. If the bark was dried to a lower water content, the required relative size and price of the dryer would increase. Similarly, drying a bark with water content above 31 wt% is not very advantageous because drying effectivity continues to increase rapidly at this stage, and the required relative size of the dryer therefore decreases.

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Section: Introductionmentioning

confidence: 99%

Drying Biomass with a High Water Content—The Influence of the Final Degree of Drying on the Sizing of Indirect Dryers

2022

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“…Also, for pyrolysis, energy is needed for the combustion of wet syngas in the flare as well. The predrying of biomass also has a high energy demand . For the HTC process, biomass can be dried by mechanical dewatering, which consumes less energy than thermal drying .…”

Section: Beyond the Labmentioning

confidence: 99%

“…The predrying of biomass also has a high energy demand. 137 For the HTC process, biomass can be dried by mechanical dewatering, which consumes less energy than thermal drying. 138 However, energy is still needed for the dewatering of the wet hydrochar.…”

Section: ■ Introductionmentioning

confidence: 99%

Biomass-Derived Carbonaceous Materials: Recent Progress in Synthetic Approaches, Advantages, and Applications

Yang

Liu

et al. 2019

ACS Sustainable Chem. Eng.

186

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Current energy shortages and environmental crises have compelled researchers to look for inexpensive and sustainable resources that can be obtained via environmentally friendly routes to produce novel functional materials. Biomass has been identified as one of the promising candidates given its availability in large quantities and renewable nature. Among the various feasible synthetic strategies, hydrothermal carbonization (HTC) has been admired for its energy efficiency and ability to synthesize carbonaceous materials for use in a wide range of applications. In this review, the different types of biomass and strategies available for the synthesis of carbon-based materials are discussed. Furthermore, factors influencing the efficiency of each strategy are analyzed and evaluated. Subsequently, the utilization of carbonaceous materials in environmental, catalytic, electrical, and biological applications are reviewed to further demonstrate their functionalities across different fields.

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“…In actual operation, the flue gas temperature may be higher than the design value which results in a lower boiler thermal efficiency and a higher fuel consumption. The heat in the exhaust flue gas can be used to preheat feedwater by a low-pressure economizer [5][6][7] and pre-dry brown coal [8][9][10][11]. The waste heat of exhaust flue gas can also be used to drive an organic Rankine cycle to produce electric power [5,[12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Waste Heat Recovery from Fossil-Fired Power Plants by Organic Rankine Cycles

Liu¹

2020

Organic Rankine Cycles for Waste Heat Recovery - Analysis and Applications

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More than 60% of the world's electricity is still produced from fossil-fired power plants. Recovering heat from flue gas, drained water, and exhaust steam which are discharged in power plants by organic Rankine cycles (ORCs) to generate power is an efficient approach to reduce fossil fuel consumption and greenhouse gas emissions. This chapter proposes conceptual ORC systems for heat recovery of drain from continuous blowdown systems, exhaust flue gas from boilers, and exhaust steam from turbines. The waste heat source temperatures range from 30 to 200°C. Environmentally friendly and nonflammable working fluids including R134a,

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Using pre-drying technology to improve the exergetic efficiency of bioenergy utilization process with combustion: A case study of a power plant

Cited by 16 publications

References 27 publications

Drying Biomass with a High Water Content—The Influence of the Final Degree of Drying on the Sizing of Indirect Dryers

Drying Biomass with a High Water Content—The Influence of the Final Degree of Drying on the Sizing of Indirect Dryers

Biomass-Derived Carbonaceous Materials: Recent Progress in Synthetic Approaches, Advantages, and Applications

Waste Heat Recovery from Fossil-Fired Power Plants by Organic Rankine Cycles

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