High-efficiency conversion of natural gas fuel to power by an integrated system of SOFC, HCCI engine, and waste heat recovery: Thermodynamic and thermo-economic analyses

Zhu, Pengfei; Yao, Jing; Qian, Chenhui; Yang, Fusheng; Porpatham, E.; Zhang, Zaoxiao; Wu, Zhen

doi:10.1016/j.fuel.2020.117883

Cited by 56 publications

(14 citation statements)

References 44 publications

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“…Choi et al 19 demonstrated that SOFC anode off-gas can be used as fuel in an ICE engine operating in homogeneous charge compression ignition (HCCI) mode, with a minimal amount of nitrogen oxide (NO x ) and total hydrocarbon (THC) emissions. Another SOFC-HCCI hybrid system for power generation was modeled by Zhu et al 20 who predicted an energy conversion efficiency of 65.7%. Further, Park et al 21 modeled and compared SOFC-GT and SOFC-HCCI systems and reported that the latter could achieve an electrical efficiency of up to 60%, which is comparable to a SOFC-GT hybrid system.…”

Section: Introductionmentioning

confidence: 99%

Investigating anode off-gas under spark-ignition combustion for SOFC-ICE hybrid systems

Ran

Longtin

Assanis

2021

International Journal of Engine Research

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Solid oxide fuel cell – internal combustion engine (SOFC-ICE) hybrid systems are an attractive solution for electricity generation. The system can achieve up to 70% theoretical electric power conversion efficiency through energy cascading enabled by utilizing the anode off-gas from the SOFC as the fuel source for the ICE. Experimental investigations were conducted with a single cylinder Cooperative Fuel Research (CFR) engine by altering fuel-air equivalence ratio (ϕ), and compression ratio (CR) to study the engine load, combustion characteristics, and emissions levels of dry SOFC anode off-gas consisting of 33.9% H2, 15.6% CO, and 50.5% CO2. The combustion efficiency of the anode off-gas was directly evaluated by measuring the engine-out CO emissions. The highest net-indicated fuel conversion efficiency of 31.3% occurred at ϕ = 0.90 and CR = 13:1. These results demonstrate that the anode off-gas can be successfully oxidized using a spark ignition combustion mode. The fuel conversion efficiency of the anode tail gas is expected to further increase in a more modern engine architecture that can achieve increased burn rates in comparison to the CFR engine. NOx emissions from the combustion of anode off-gas were minimal as the cylinder peak temperatures never exceeded 1800 K. This experimental study ultimately demonstrates the viability of an ICE to operate using an anode off-gas, thus creating a complementary role for an ICE to be paired with a SOFC in a hybrid power generation plant.

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Section: Introductionmentioning

confidence: 99%

Investigating anode off-gas under spark-ignition combustion for SOFC-ICE hybrid systems

Ran

Longtin

Assanis

2021

International Journal of Engine Research

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“…The low reactivity between the electrolyte and the electrodes does not significantly affect the cell's electrochemical activity. This fact is supported by the relatively small ASR value of the cell 0.9266 Q .cm 2 , the relatively high total conductivity ( 0.0093 S.cnr 1 ) at an operating temperature of 6oo°C.…”

mentioning

confidence: 82%

“…The increasing need for energy is a challenge in developing alternative energy sources and supporting technology. Most of today's energy needs are obtained from non-renewable energy sources, especially fossil fuels such as petroleum, coal, and natural gas [1]. Therefore an electrochemical device is needed to convert chemical energy into electrical energy with very high efficiency, which is often referred to as Solid Oxide Fuel Cell (SOFC) [1,2].…”

Section: Introductionmentioning

confidence: 99%

A Compatibility in the Single Cell of the NiO/LSGM/LSCF

et al. 2020

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The compatibility between anode, electrolyte, and cathode in a solid fuel cell determines its performance. Research on the compatibility between fuel cell components is challenging, especially for SOFCs that operate at high temperatures. Therefore, efforts to reduce the operating temperature to become intermediate temperature SOFC (IT-SOFC) are essential to facilitate compatibility between its components. La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) has been recognized as one of the most promising cathode materials for (IT-SOFC) due to its high electronic conductivity and excellent electrical performance. While La0.8Sr0.2Ga0.8Mg0.2O3–δ (LSGM) has a high oxygen ion conductivity at low temperatures, its chemical stability is still not good. LSGM is known to have interface reactivity with other components such as NiO and LSCF in fuel cells. This study looked at the compatibility of NiO/LSGM/LSCF cells prepared by the solid chemical synthesis method. Compatibility evaluation is determined by the Thermal Expansion Coefficient (TEC) parameter using the dilatometric method, Area Specific Resistance (ASR), and TBF area morphology by Scanning Electron Microscope-Energy Dispersive Spectroscopy (SEM-EDS). While the conductivity of the cells is determined by Electrochemical Impedance Spectroscopy (EIS). NiO/LSGM/LSCF cells have good compatibility with a value of 78.05 kg-1.K.A.s3.µ2 at a temperature of 600°C. The ASR values of cells tend to decrease with increasing temperature and conductivity values at small TEC values. Based on these parameter values, delamination in NiO/LSGM/LSCF cells did not occur.

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“…The energy consumptions of the compressor (Q com , kW) and pump (Q pump , kW) in the water removal unit are estimated by the pressure ratio and pump head by eqs 1 and 2, respectively. 37,38 F, H P , ρ, and Q pump are given in gpm, ft, lb/gal, and Hp in ref 38, and they are converted into L/min, cm, g/L, and kW in this work (1 gpm = 3.7854 L/min, 1 ft = 30.48 cm, 1 lb/gal = 119.83 g/L, and 1 Hp = 0.746 kW). The energy consumption of the other equipment including distillation columns, coolers, heat exchangers, reactors, and so on can be obtained based on rigorous simulation using Aspen HYSYS.…”

Section: ■ Model Formulationmentioning

confidence: 99%

Simulation-Based Superstructure Optimization for the Synthesis Process of Aromatics Production from Methanol

Zhang

Jiang

Yang

et al. 2021

ACS Sustainable Chem. Eng.

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This work develops a novel superstructure considering a reaction−separation system for aromatics production from methanol, which consists of methanol aromatization, water removal, product separation, and light hydrocarbon aromatization units. On the basis of rigorous simulation of these units in Aspen HYSYS, a multiobjective simulation−optimization model is established for synthesis of methanol to aromatics process to simultaneously optimize the net present value and unit ReCiPe score. A matrix-based method is proposed to determine the Pareto-optimal curve and identify the optimal production routes through data interaction between MATLAB and Aspen HYSYS. The most profitable production route generates a net present value 39.0% higher than the lowest one, and the most environmentally sustainable production route shows a unit ReCiPe score 66.42% lower than the worst one. Monte Carlo simulation is used to investigate the effects of uncertain economic parameters on the three obtained Pareto-optimal production routes, which present robustness in the face of fluctuations of raw material and product prices as well as capital investment. Besides, the optimal production routes for variant reaction effluents are also analyzed to show the insight in production route selection.

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High-efficiency conversion of natural gas fuel to power by an integrated system of SOFC, HCCI engine, and waste heat recovery: Thermodynamic and thermo-economic analyses

Cited by 56 publications

References 44 publications

Investigating anode off-gas under spark-ignition combustion for SOFC-ICE hybrid systems

Investigating anode off-gas under spark-ignition combustion for SOFC-ICE hybrid systems

A Compatibility in the Single Cell of the NiO/LSGM/LSCF

Simulation-Based Superstructure Optimization for the Synthesis Process of Aromatics Production from Methanol

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