摘要详情
62 / 2023-05-16 09:54:26
Environmentally friendly accelerator-NiMnGa micro/nano fluid enhanced methane hydration kinetics experiment
hydrate,DIOX,L-tryptophan,kinetics
摘要录用
The hydrate method can be used to improve the clean utilization of coal mine gas due to its many properties. Adding accelerators can effectively improve the phenomenon of slow gas-liquid mass and heat transfer, and it is important to study the kinetic promotion effect of environmentally friendly additives for the gas hydration process. In this experiment, 1,3-dioxolane (DIOX), which with low toxicity and volatility, was chosen as a thermodynamic promoter. In order to alleviate the phenomenon of low gas consumption caused by DIOX occupying the hydrate cage, a recyclable magnetic alloy micro-nanoparticle NiMnGa was added to increase the gas consumption of the hydration ,while a biodegradable surfactant L-tryptophan was compounded to further enhance the kinetic effect of the hydration process. To reduce the particle agglomeration and sedimentation caused by the high surface energy between the micro- and nano-particles, the experimental equipment was equipped with an external rotating magnetic field to improve the suspension stability of the NiMnGa micro-nanoparticles and also to play a certain role of agitation. The aim of this experiment is to investigate of different concentrations of NiMnGa ( 0,1,2,3 wt.% ) micro-nano particles on the kinetics of methane hydrate in the mixed system of 1 wt.% L-tryptophan and 0.5 wt.% DIOX in the presence of a rotating magnetic field at 6.2 MPa and 2°C.
The results show that the induction time of all systems in this experiment is very short, and the induction time of the system with 1 wt.% NMG is about 14.7 % shorter than that of the system without NiMnGa micro-nanoparticles. In addition, the induction time increased with the addition of NiMnGa micro-nanoparticles concentration. The gas consumption increased from 26.27 mmol/mol to 37.22 mmol/mol when the NiMnGa concentration was increased from 0 wt.% to 3 wt.%, which was equivalent to 1.42 times of the gas consumption of the system without the addition of NiMnGa. The average gas consumption rates in the first 30 minutes were 7.04 mmol/mol/min, 7.78 mmol/mol/min, 8.81 mmol/mol/min and 8.13 mmol/mol/min for the 0 wt.%, 1 wt.%, 2 wt.% and 3 wt.% NiMnGa addition systems, respectively, the overall trend was increasing and then decreasing. The above experimental results showed that the mixing concentration of 3 wt.% NiMnGa in the L-tryptophan+DIOX complex system could effectively shorten the hydration process and increase the gas consumption and gas consumption rate of the hydration process.
This is because of the hydrophobic L-tryptophan has a surfactant-promoting effect, and its unique aromatic hydrocarbon side chain also has a superior promoting effect on gas hydrate kinetics[1]. On the other hand, L-tryptophan has the ability to produce only a small amount of foam during the decomposition of hydrate compared to SDS, which increases the recovery rate of hydrate and the reusability of material, which is important for cost saving and environmental protection.DIOX is an environmentally friendly and clean thermodynamic promoter that is expected to replace THF in the future, and it can improve the thermodynamic conditions of hydrate by changing the type of hydrate to promote hydrate formation. And NiMnGa micro-nanoparticles increase the nucleation sites of methane hydrate and can pass through the holes at the gas-liquid interface to complete gas transport [2], further increasing the gas-liquid contact area. In addition, NiMnGa is also an alloy particle, and the unique thermal conductivity of the metal can also timely export the hydration heat in the system, which provides a good growth environment for hydrate generation. In summary,this study provides a new idea for the subsequent application of hydrate technology to industry, and also contributes to environmental protection and cost saving.
The results show that the induction time of all systems in this experiment is very short, and the induction time of the system with 1 wt.% NMG is about 14.7 % shorter than that of the system without NiMnGa micro-nanoparticles. In addition, the induction time increased with the addition of NiMnGa micro-nanoparticles concentration. The gas consumption increased from 26.27 mmol/mol to 37.22 mmol/mol when the NiMnGa concentration was increased from 0 wt.% to 3 wt.%, which was equivalent to 1.42 times of the gas consumption of the system without the addition of NiMnGa. The average gas consumption rates in the first 30 minutes were 7.04 mmol/mol/min, 7.78 mmol/mol/min, 8.81 mmol/mol/min and 8.13 mmol/mol/min for the 0 wt.%, 1 wt.%, 2 wt.% and 3 wt.% NiMnGa addition systems, respectively, the overall trend was increasing and then decreasing. The above experimental results showed that the mixing concentration of 3 wt.% NiMnGa in the L-tryptophan+DIOX complex system could effectively shorten the hydration process and increase the gas consumption and gas consumption rate of the hydration process.
This is because of the hydrophobic L-tryptophan has a surfactant-promoting effect, and its unique aromatic hydrocarbon side chain also has a superior promoting effect on gas hydrate kinetics[1]. On the other hand, L-tryptophan has the ability to produce only a small amount of foam during the decomposition of hydrate compared to SDS, which increases the recovery rate of hydrate and the reusability of material, which is important for cost saving and environmental protection.DIOX is an environmentally friendly and clean thermodynamic promoter that is expected to replace THF in the future, and it can improve the thermodynamic conditions of hydrate by changing the type of hydrate to promote hydrate formation. And NiMnGa micro-nanoparticles increase the nucleation sites of methane hydrate and can pass through the holes at the gas-liquid interface to complete gas transport [2], further increasing the gas-liquid contact area. In addition, NiMnGa is also an alloy particle, and the unique thermal conductivity of the metal can also timely export the hydration heat in the system, which provides a good growth environment for hydrate generation. In summary,this study provides a new idea for the subsequent application of hydrate technology to industry, and also contributes to environmental protection and cost saving.
重要日期
-
会议日期
08月18日
2023
至08月20日
2023
-
07月07日 2023
初稿截稿日期
-
08月20日 2023
注册截止日期
主办单位
International Committee of Mine Safety Science and Engineering
承办单位
Heilongjiang University of Science and Technology
联系方式
- Mrs. Dr. Li
- i******@ismsse.com
- 188********
历届会议
-
2025年10月10日 中国 Jiaozuo
The 8th International Symposium on Mine Safety Science and Engineering -
2024年08月17日 美国 Pittsburgh
The 7th International Symposium on Mine Safety Science and Engineering (ISMSSE 2024) -
2021年11月21日 波兰 Katowice
The Fifth International Symposium on Mine Safety Science and Engineering -
2018年10月22日 中国
第四届矿山安全科学与工程国际会议 -
2013年09月21日 中国 北京市
第二届矿山安全科学与工程国际学术会议
