Effect of hydrogen enrichment of compressed natural gas on combustible limit and flame kernel evolution in a constant volume combustion chamber using laser ignition

Prasad, Rajesh Kumar; Ágarwal, Avinash Kumar

doi:10.1016/j.fuel.2021.121112

Cited by 10 publications

(2 citation statements)

References 29 publications

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“…Hydrogen blend can enhance and advance the combustion of the CNG engine NOx emission increased with increase of hydrogen in hydrogen-mixed natural gas, but HC, and soot emissions decreased [9,10]. 15% hydrogen blend accounts for the least amount of CO 2 emission, which is a major Green House Gas, while 5% hydrogen fraction and pure CNG blend accounts for higher emissions [11,12]. Huang et al [13] investigated the effect of hydrogen-mixed natural gas on pipe gas interchangeability.…”

Section: Introductionmentioning

confidence: 99%

Feasibility Analysis of Typical Cryogenic Processes for Hydrogen-Mixed Natural Gas Separation

Ma¹,

Zhang²,

Wang³

et al. 2023

Energy Engineering

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Hydrogen energy is a crucial carrier for the growth of the energy system and its low-carbon transformation. Using natural gas as a carrier of hydrogen transport and the natural gas pipeline network for transportation is a significant step toward realizing large-scale and long-distance hydrogen transport. Hydrogen-mixed natural gas is mainly separated into hydrogen and natural gas by physical methods at present. High purity of hydrogen recovery, but the recovery rate is low. At the same time, compared with natural gas, liquefied natural gas is more economical and flexible. This study analyzes three typical cryogenic separation processes. The results show that the hydrogen separation efficiency and specific energy consumption increase and the liquefaction rate and energy consumption decrease as the hydrogen ratio increases. The energy consumption and specific energy consumption of C3-MRC are lower than the MRC and the cascade liquefaction processes. Besides, as the pressure increases in the C3-MRC liquefaction process, the liquefaction and hydrogen separation efficiency increase and subsequently drop. Different hydrogen content has the highest hydrogen separation efficiency and liquefaction efficiency under different feed gas pressure conditions. The total exergy losses of the C3-MRC are the least in different hydrogen fractions, which are 37.59% and 21.77% less in the 25% hydrogen fraction, and 37.89% and 21.37% less in the 30% hydrogen fraction. Moreover, the exergy efficiency of C3-MRC are 87.68% and 88.06% when the hydrogen fraction are 25% and 30%, higher than the other two processes, which implies that in 25% and 30% fractions, making it more suitable for separate the hydrogen by the cryogenic separation.

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Section: Introductionmentioning

confidence: 99%

Feasibility Analysis of Typical Cryogenic Processes for Hydrogen-Mixed Natural Gas Separation

Ma¹,

Zhang²,

Wang³

et al. 2023

Energy Engineering

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“…This is because H 2 has a wide flammable range, high flame propagation speed, low ignition energy, and carbon-free combustion characteristics. 7 Adding a suitable proportion of H 2 to the NG mixture can improve the flame propagation speed, 8 extend the flammability limit, 9,10 reduce cycle-to-cycle variation, and improve combustion stability 11,12 and ITE. 13 Zhou 14 found that adding H 2 to NG-air mixture, H, O, OH and OH 2 increase significantly, which helps to enhance the combustion process.…”

Section: Introductionmentioning

confidence: 99%

Effects of hydrogen mixing ratio on combustion and emissions of natural gas‐diesel dual fuel engine with high natural gas substitution rate

Guo

Xia

et al. 2023

Env Prog and Sustain Energy

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In order to explore the feasibility of natural gas (NG)/diesel dual‐fuel engine with high NG substitution rate under medium and low load, the effects of hydrogen (H2) on the performance and emissions of the engine are studied numerically. The baseline engine is a four‐cylinder turbocharged diesel engine, which is modified into a diesel‐Natural Gas‐Hydrogen ternary fuels engine with port‐injected H2 and NG fuels and direct‐injected diesel fuel. The simulation is performed using GT‐Power software, and numerical results are validated with the experimental data. The percentage of diesel fuel is set at 10% and 20% (by energy). The engine speed decreases from high speed to medium speed and finally to low speed. The engine load decreases from medium load to low load. The H2 mixing ratio increases from 10% to 50%. The results show that, with the increase of H2 mixing ratio, the peak cylinder pressure (PCP), the peak cylinder temperature (PCT), the heat release rate (HRR) and the maximum pressure rise rate (MPRR) increase, while the indicated thermal efficiency (ITE) decreases under all working conditions. Among them, the MPRR increases by 4%~13% at medium load and 1%~2% at low load, but it does not exceed 0.6 MPa/ (°) CA. The indicated thermal efficiency decreases by 1%~4% at medium and low load. In terms of emissions, the carbon monoxide (CO) and the hydrocarbons (HC) decrease by 34%~43%, but the nitrogen oxide (NOX) increases by 58%~73%.

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Experimental comparison of performance and emissions of a direct-injection engine fed with alternative gaseous fuels

Thawko

Eyal

Tartakovsky

2022

Energy Conversion and Management

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Effect of hydrogen enrichment of compressed natural gas on combustible limit and flame kernel evolution in a constant volume combustion chamber using laser ignition

Cited by 10 publications

References 29 publications

Feasibility Analysis of Typical Cryogenic Processes for Hydrogen-Mixed Natural Gas Separation

Feasibility Analysis of Typical Cryogenic Processes for Hydrogen-Mixed Natural Gas Separation

Effects of hydrogen mixing ratio on combustion and emissions of natural gas‐diesel dual fuel engine with high natural gas substitution rate

Experimental comparison of performance and emissions of a direct-injection engine fed with alternative gaseous fuels

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