Exergy analysis of the LFC process

Li, Qingsong; Lin, Yuankui

doi:10.1016/j.enconman.2015.11.024

Cited by 25 publications

(6 citation statements)

References 20 publications

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“…For operational component assessment, Tsatsaronis and Lazzaretto [38] proposed and established a fuel and product exergy model. As shown in Table 1, the transesterification and neutralization processes were assessed in this study using the strategy by Boyano et al [39].…”

Section: Mmentioning

confidence: 99%

Comparison of the Techno-Economic and Environmental Assessment of Hydrodynamic Cavitation and Mechanical Stirring Reactors for the Production of Sustainable Hevea brasiliensis Ethyl Ester

Samuel,

Aigba,

Tran

et al. 2023

Sustainability

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Even though the hydrodynamic cavitation reactor (HCR) performs better than the mechanical stirring reactor (MSR) at producing biodiesel, and the ethylic process of biodiesel production is entirely bio-based and environmentally friendly, non-homogeneous ethanol with the triglyceride of underutilized oil, despite the many technical advantages, has discouraged the biodiesel industry and stakeholders from producing ethylic biodiesel in HCRs. This study examines the generation of biodiesel from rubber seed oil (RSO) by comparing the ethyl-based HCR and MSR. Despite ethyl’s technical advantages and environmental friendliness, a lack of scalable protocols for various feedstocks hinders its global adoption. The research employs Aspen HYSYS simulations to investigate the ethanolysis process for RSO in both HCRs and MSRs. The HCR proves more productive, converting 99.01% of RSO compared to the MSR’s 94.85%. The HCR’s exergetic efficiency is 89.56% vs. the MSR’s 54.92%, with significantly lower energy usage. Removing catalytic and glycerin purification stages impacts both processes, with HC showing lower exergy destruction. Economic analysis reveals the HCR’s lower investment cost and higher net present value (USD 57.2 million) and return on investment (176%) compared to the MSR’s. The HCR also has a much smaller carbon footprint, emitting 7.2 t CO2 eq./year, while the MSR emits 172 t CO2 eq./year. This study provides database information for quickly scaling up the production of ethanolic biodiesel from non-edible and third-generation feedstocks in the HCR and MSR.

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Section: Mmentioning

confidence: 99%

Comparison of the Techno-Economic and Environmental Assessment of Hydrodynamic Cavitation and Mechanical Stirring Reactors for the Production of Sustainable Hevea brasiliensis Ethyl Ester

Samuel,

Aigba,

Tran

et al. 2023

Sustainability

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“…(4) The flue gas does not react with the lignite particle. (5) The gaseous phase can be treated as an ideal gas. (6) The lignite particle is in local thermodynamic equilibrium.…”

Section: Slp Drying Modelmentioning

confidence: 99%

“…Thus, the efficient and environmentally friendly utilization of low-rank coal has come to the forefront. As the largest storage and most widely used low-rank coal, lignite has become the energy mainstay of China, especially because of its abundance, easy availability, low exploitation difficulty, and high reactivity. − However, the high moisture content of lignite might act as a dominating barrier hampering its wide application. Specifically, the high moisture content might result in the reduction of thhe calorific value and combustion efficiency of lignite − and bring about higher costs and potential safety hazards during transportation and storage. − Moreover, the high moisture content might lead to an increase in CO 2 emissions, a delay in devolatilization during the pyrolysis process, and the degradation of the gas quality during the gasification process .…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experimental Research on Drying Behavior of a Single Lignite Particle (SLP) under High-Temperature Flue Gas

Zhang

et al. 2017

Energy Fuels

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The drying behavior of a single lignite particle (SLP) in high-temperature (600–900 °C) flue gas was investigated by experiment and numerical calculations. A self-designed horizontal fixed-bed reactor was employed for high-temperature drying experiments. Based on the drying curves obtained from these experiments, no constant-drying-rate stage was found, and the SLP drying process included stages with increasing and decreasing drying rates. To explore the drying process in depth, a mathematical model was developed in which the SLP was simplified into a simple spherical model. Based on the dry–wet zone theory, the heat- and mass-transfer equations were established to describe the drying process. The simulated results calculated using MATLAB agreed well with the experimental data. The model can predict SLP drying behaviors including the effects of the drying time, the surface and internal temperature distributions of the lignite particle, the migration of the evaporation interface inside the particle, and so on. The predicted results indicated that the migration velocity of the evaporation interface and the temperature were linearly dependent and that a temperature of 700 °C was the most suitable temperature for lignite drying. Furthermore, the drying time can be predicted using the model according to practical applications. Thus, the model can be used for the optimization of the drying process parameters and can offer guidance for the development of new drying technologies.

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“…Coal pyrolysis techniques were developed mainly based on the particle size. These processes include LR, Toscoal, DG, COED, LFC, GF-1, SJ, MRF (see abbreviations), and so on. − At present, LFC, GF-1, SJ, and other processes are established for industrial lignite pyrolysis in China, where these processes are mainly applicable to large particles (30–80 mm) . Due to the thermal fragility of lignite, the large amount of dust generated in the pyrolysis process leads to oil–gas flow short circuit and blocks the gas pipeline, interrupting stable and continuous system operation. − …”

Section: Introductionmentioning

confidence: 99%

Research of New Cross-Flow Technology with a Gas Heat Carrier for Lignite Pyrolysis

2020

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The adaptability of the gas heat carrier cross-flow pyrolysis process to Huolinhe lignite (0–80 mm) and the influence of the temperature of the heat carrier and moisture of the raw materials on the yield and properties of the pyrolysis products were studied using a 30 t/d cross-flow pyrolysis pilot plant with a gas heat carrier. When the temperature of the gas heat carrier was increased from 750 to 850 °C, the volatiles ( V daf ) produced from the char decreased from 16.81 to 10.57%, the yield of tar ( Tar d ) increased from 73.81 to 81.1% of the Gray-King (G-K) tar yield, and the yield of gas decreased from 1312 to 1205 Nm 3 /t. When the temperature of the gas heat carrier was constant at 850 °C and the moisture content ( M t ) of lignite was reduced from 12.49 to 7.14%, the V daf of char declined from 10.57 to 6.59%, the yield of gas was reduced from 1205 to 805 Nm 3 /t, the calorific value of gas increased from 3.88 to 4.68 MJ/m 3 , and the Tar d increased to 81.56% of the G-K tar yield. The light tar content (boiling point below 360 °C) was more than 60%, and the ash content was less than 0.04%. The cross-flow pyrolysis moving bed could effectively treat full-size lignite, afforded continuous and stable operation, and provided a high oil and gas yield, which provides basic data for further industrial design.

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Exergy analysis of the LFC process

Cited by 25 publications

References 20 publications

Comparison of the Techno-Economic and Environmental Assessment of Hydrodynamic Cavitation and Mechanical Stirring Reactors for the Production of Sustainable Hevea brasiliensis Ethyl Ester

Comparison of the Techno-Economic and Environmental Assessment of Hydrodynamic Cavitation and Mechanical Stirring Reactors for the Production of Sustainable Hevea brasiliensis Ethyl Ester

Numerical Simulation and Experimental Research on Drying Behavior of a Single Lignite Particle (SLP) under High-Temperature Flue Gas

Research of New Cross-Flow Technology with a Gas Heat Carrier for Lignite Pyrolysis

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