Enhancement of energy efficiency by exhaust gas recirculation with oxygen-rich combustion in a natural gas combined cycle with a carbon capture process

Lee, Woo Sung; Kang, Jahyo; Lee, Jae Cheol; Lee, Chang Ha

doi:10.1016/j.energy.2020.117586

Cited by 30 publications

(15 citation statements)

References 57 publications

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“…From a practical point of view, the lower the O 2 content in the exhaust, the more complete the reaction. Typically, the O 2 content in the chimney is about 3% [50]. Figure 11b shows a singular point, which coincides with an increase higher than expected in the CO 2 emissions.…”

Section: Exhaust Gas Analysissupporting

confidence: 54%

Experimental Study of Biogas–Hydrogen Mixtures Combustion in Conventional Natural Gas Systems

et al. 2021

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Biogas is a renewable gas with low heat energy, which makes it extremely difficult to use as fuel in conventional natural gas equipment. Nonetheless, the use of hydrogen as a biogas additive has proven to have a beneficial effect on flame stability and combustion behavior. This study evaluates the biogas–hydrogen combustion in a conventional natural gas burner able to work up to 100 kW. Tests were performed for three different compositions of biogas: BG70 (30% CO2), BG60 (40% CO2), and BG50 (50% CO2). To achieve better flame stability, each biogas was enriched with hydrogen from 5% to 25%. The difficulty of burning biogas in conventional systems was proven, as the burner does not ignite when the biogas composition contains more than 40% of CO2. The best improvements were obtained at 5% hydrogen composition since the exhaust gas temperature and, thus, the enthalpy, rises by 80% for BG70 and 65% for BG60. The stability map reveals that pure biogas combustion is unstable in BG70 and BG60; when the CO2 content is 50%, ignition is inhibited. The properties change slightly when the hydrogen concentrations are more than 20% in the fuel gas and do not necessarily improve.

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Section: Exhaust Gas Analysissupporting

confidence: 54%

Experimental Study of Biogas–Hydrogen Mixtures Combustion in Conventional Natural Gas Systems

et al. 2021

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“…Although multiple carbon capture materials and technologies exist depending on the source and concentration, the scale of these processes is extremely large, and the processing units are fixed [37,38]. For instance, the annual CO 2 emissions of a power plant producing 700 MW are equivalent to the emissions of one million cars, and a typical passenger vehicle emits about 4.6 metric tons of CO 2 per year.…”

Section: State Of the Science: Key Challengesmentioning

confidence: 99%

Capture of CO2 and Water While Driving for Use in the Food and Agricultural Systems

2021

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This white paper proposes research on the design and evaluation of an integrated system assembled to the vehicle with no energy penalty where a sequence of processes, cooling, heating, mass transfer, and compression, will take place while driving. The increasing demand for fresh produce has led to an expansion of the US urban agriculture industry (greenhouses) which uses carbon dioxide (CO 2 ) enrichment from burning fossil fuels to increase plant productivity and to shorten the plant growth time. The demand for CO 2 and water in greenhouses is massive (2.81 kg CO 2 eq/kg produce, 22 L water/kg produce), and alternate CO 2 and water delivery sources are essential to make post-harvest food processing technologies such as dense-phase CO 2 pasteurization of beverages more sustainable. Internal combustion engines (ICE) have an average efficiency of about 30%, with 30% of the thermal energy wasted in the exhaust gases. A typical passenger vehicle emits about 4.6 metric tons of CO 2 and 21,000 l of water per year into the environment. Although multiple carbon capture technologies exist, the size of these plants is large, their unit operations are fixed, and the use of novel materials is limited. In this white paper, we propose to retrofit the wasted energy in a car's exhaust to capture, concentrate, store, and deliver liquid CO 2 and water for agricultural and food systems. Preliminary thermodynamic and exergy analysis indicates that this is feasible. Specially designed heat and mass transfer units with novel materials and 3D printing technology could be easily deployed and used while driving to mitigate the global warming problem while addressing the needs of agricultural systems.

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“…Natural gas combined cycle (NGCC) power plants are rapidly expanding worldwide to produce electricity due to various advantages compared with other types of gas power plants . The efficiency of NGCC plants ranges from 45 to 57% .…”

Section: Introductionmentioning

confidence: 99%

“…2 Natural gas combined cycle (NGCC) power plants are rapidly expanding worldwide to produce electricity due to various advantages compared with other types of gas power plants. 3 The efficiency of NGCC plants ranges from 45 to 57%. 4 Furthermore, carbon dioxide gas emissions from NGCC power plants are lower than those from coal-fired power plants.…”

Section: Introductionmentioning

confidence: 99%

Performance and Cost Analysis of Natural Gas Combined Cycle Plants with Chemical Looping Combustion

Lee

Lee³

2021

ACS Omega

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The natural gas combined cycle (NGCC) is the most popular and efficient fossil fuel power plant; however, integrating a carbon capture system reduces its performance efficiency. The demand to reduce the carbon capture cost and improve eco-friendliness drives the development of alternatives. In this study, four alternative NGCC-based process schemes were designed: NGCC with amine carbon capture as a base configuration and NGCCs with three different chemical looping combustion (CLC) configurations. Detailed heat and material balances were evaluated for all four cases using the PRO/II simulation package. A comparative analysis of the gross and net power, plant efficiency, and carbon capture efficiency, which are imperative to optimizing the process configuration, was conducted for all of the proposed cases. All NGCC-CLC processes could produce higher net power than NGCC-MEA because the amine regenerator consumes a high amount of power in its operation. In the condition using an equal amount of natural gas supply, NGCC-CLC configurations using excess air could produce a net power of 510.1 MW with a plant efficiency of 44.35%. The excess air fed in both cases enabled the turbine to generate more power. NGCC-CLC using excess air with steam turbine integration has an investment cost of 132.9 $/net MWh, an operating cost of 56.7 $/net MWh year, and a levelized cost of electricity of 90.9 $/MWh. In addition, NGCC-CLC with excess air resulted in a carbon capture efficiency of 99.93% under 59.2 $/ton of CO 2 , which was higher than that of NGCC-MEA with a carbon efficiency of 95.1%. NGCC-CLC using excess air with steam turbine integration is considered as the most efficient process scheme for generating power from natural gas with regard to efficiency, cost, and environmental impact.

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Enhancement of energy efficiency by exhaust gas recirculation with oxygen-rich combustion in a natural gas combined cycle with a carbon capture process

Cited by 30 publications

References 57 publications

Experimental Study of Biogas–Hydrogen Mixtures Combustion in Conventional Natural Gas Systems

Experimental Study of Biogas–Hydrogen Mixtures Combustion in Conventional Natural Gas Systems

Capture of CO2 and Water While Driving for Use in the Food and Agricultural Systems

Performance and Cost Analysis of Natural Gas Combined Cycle Plants with Chemical Looping Combustion

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