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Enhance hydrates formation with stainless steel fiber for high capacity methane storage

Chinese Journal of Chemical Engineering 2022年第10期50卷 435-443页

作者： Zhixia Deng Shuanshi Fan Yanhong Wang xuemei lang Gang Li School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510640China Guangdong Engineering Technology Research Center of Advanced Insulating Coating Zhuhai 519175China Institute of Modern Industrial Innovation South China University of TechnologyZhuhai 519175China Key Laboratory of Fuel Cell Technology of Guangdong Province Guangzhou 510640China

In order to realize efficient gas storage of hydrate,stainless steel fiber(SSF)was added to 0.03%(mass)sodium dodecyl sulfate(SDS)solution for gas storage experiment.SSF can not only improve the problem that hydration heat cannot be removed effectively in the hydration process,but also improve gas storage speed and gas storage by increasing hydrate nucleation sites.Under the experimental conditions(273.2 K,5-9 MPa),the peaks of temperature rise in SDS+SSF systems were found to become much smaller than those in SDS systems.The maximum gas storage rate and the maximum methane uptake of SSF+SDS system reached 9.89-24.90 cm^(3)·g^(-1)·min^(-1) and 178.65-200.89 cm^(3)·(g H_(2)O)-1,respectively.Compared with the surfactant SDS solution without SSF,they increased by 10.47%-33.22%and 9.16%-25.36%,respectively.The effect of SSF length on gas storage performance was studied.Due to the continuous thermal conduction network,longer SSF showed a higher gas storage capacity and methane uptake rate compared with shorter SSF.At the same time,compared with other metal fillers,SSF+SDS not only had excellent gas storage performance,but also the amount of SSF(0.1 g·ml^(-1))was only 7.6%of foamed aluminum,and the volume gas storage density was increased by 145.4%.The use of stainless steel fiber made the best use of the thermal conductivity of metal,reduced the amount of metal used,and improved the volume density and mass density of gas storage.

关键词： Methane Stainless steelfiber Gas storagecapacity Hydrate Gas storagerate Heat transfer

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Hydrate capture CO_2 from shifted synthesis gas, flue gas and sour natural gas or biogas

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Journal of Energy Chemistry 2013年第1期22卷 39-47页

作者： Yanhong Wang xuemei lang Shuanshi Fan School of Chemistry and Chemical Engineering Key Lab of Enhanced Heat Transfer and Energy Conservation Ministry of Education South China University of Technology

CO2 capture by hydrate formation is a novel gas separation technology, by which CO2 is selectively engaged in the cages of hydrate and is separated with other gases, based on the differences of phase equilibrium for CO2 and other gases. However. rigorous temperature and pressure, high energy cost and industrialized hydration separator dragged the development of the hydrate based CO2 capture. In this paper, the key problems in CO2 capture from the different sources such as shifted synthesis gas, flue gas and sour natural gas or biogas were analyzed. For shifted synthesis gas and flue gas, its high energy consumption is the barrier, and for the sour natural gas or biogas （CO2/CH4 system）, the bottleneck is how to enhance the selectivity of CO2 hydration. For these gases, scale-up is the main difficulty. Also, this paper explored the possibility of separating different gases by selective hydrate formation and reviewed the progress of CO2 separation from shifted synthesis gas, flue gas and sour natural gas or biogas.

关键词： clathrate hydrate： C02 capture hydrogen shifted synthesis gas flue gas sour natural gas or biogas

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Reviews of gas hydrate inhibitors in gas-dominant pipelines and application of kinetic hydrate inhibitors in China

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Chinese Journal of Chemical Engineering 2019年第9期27卷 2118-2132页

作者： Yanhong Wang Shuanshi Fan xuemei lang Key Lab of Enhanced Heat Transfer and Energy Conservation Ministry Education School of Chemistry and Chemical Engineering South China University of Technology

During the development and application of natural gas,hydrate plugging the pipelines is a very important issue to solve.Currently,adding thermodynamic hydrate inhibitors(THIs)and kinetic hydrate inhibitors(KHIs)in gas-dominated pipelines is a main way to prevent hydrate plugging of flow lines.This paper mainly reviews the efforts to develop THIs and KHIs in the past 20 years,compare the role of various THIs,such as methanol,ethylene glycol and electrolyte,and give the tips in using.The direction of KHIs is toward high efficiency,low toxicity,low pollution and low cost.More than a hundred inhibitors,including polymers,natural products and ionic liquids,have been synthesized in the past decade.Some of them have better performance than the current commercial KHIs.However,there are still few problems,such as the complex synthesis process,high cost and low solubility,impeding the commercialization of these inhibitors.The review also summarized some application of KHIs in China.Research of KHIs in China began late.There are no KHIs used in gas pipelines.Only a few field tests have been carried out.In the end of this paper,the field test of self-developed KHIs by China is summarized,and the guidance is given according to the application results.

关键词： Gas hydrate Thermal hydrate inhibitor Kinetic hydrate inhibitor Dual-effect inhibitor Field testing

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Accelerated nucleation of tetrahydrofuran(THF)hydrate in presence of ZIF-61

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Journal of Natural Gas Chemistry 2012年第3期21卷 299-301页

作者： Yanhong Wang xuemei lang Shuanshi Fan School of Chemistry and Chemical Engineering Key Lab of Enhanced Heat Transfer and Energy ConservationMinistry of EducationSouth China University of TechnologyGuangzhou 510640GuangdongChina

Clathrate hydrate can be used in energy gas storage and transportation, CO2 capture and cool storage etc. However, these technologies are difficult to be used due to the low formation rate and long induction time of hydrate formation. In this paper, ZIF-61 （zeolite imidazolate framework, ZIF） was first used in hydrate formation to stimulate hydrate nucleation. As an additive of clathrate hydrate, ZIF-61 promoted obviously the acceleration of tetrahydrofuran （THF） hydrate nucleation. It shortened the induction time of THF hydrate formation from 2-5 h to 0.3-1 h mainly due to the template function of ZIF-61 by which the nucleation of THF hydrate has been promoted.

关键词： tetrahydrofuran hydrate hydrate promoter ZIF-61 nucleation induction time

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Recovering methane from quartz sand-bearing hydrate with gaseous CO2

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Journal of Energy Chemistry 2017年第4期26卷 655-659页

作者： Shuanshi Fan Xi Wang Yanhong Wang xuemei lang Key Lab of Enhanced Heat Transfer and Energy Conservation Ministry EducationSchool of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640GuangdongChina

The replacement method by CO;is regarded as a new approach to natural gas hydrate（NGH） exploitation method, by which methane production and carbon dioxide sequestration might be obtained simultaneously. In this study, CO;was used to recover CH;from hydrate reservoirs at different temperatures and pressures. During the CO;–CH;recovery process, the pressure was selected from 2.1 to 3.4 MPa, and the temperature ranged from 274.2 to 281.2 K. Calculating the fugacity differences between the gas phase and the hydrate phase for CO;and CH;at different conditions, it has found rising pressure was positive for hydrates formation process that was helpful for the improvement of CH;recovery rate. Rising temperature promoted the trend of CH;hydrate decomposition for the whole process of CO;–CH;replacement.The highest recovery rate was 46.6 % at 3.4 MPa 281.2 K for CO;–CH;replacement reaction in this work.

关键词： Hydrate Methane CH4 recovery CO2 sequestration

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定位格架对棒束通道出口温场分布影响研究

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核动力工程 2024年第2期45卷 116-122页

作者：仇子铖谢士杰郎雪梅李朋洲卓文彬中国核动力研究设计院中核核反应堆热工水力技术重点实验室成都610213

为分析定位格架交混能力,进一步优化定位格架热工设计方法。本文通过实验研究不同结构定位格架对棒束通道出口温场分布的影响。实验中,系统压力为7.0~16.5 MPa,质量流速为900~4500 kg·m^(-2)·s^(-1),实验段进出口温差为30~128℃。实... 详细信息

为分析定位格架交混能力,进一步优化定位格架热工设计方法。本文通过实验研究不同结构定位格架对棒束通道出口温场分布的影响。实验中,系统压力为7.0~16.5 MPa,质量流速为900~4500 kg·m^(-2)·s^(-1),实验段进出口温差为30~128℃。实验结果表明,在压水堆运行参数范围内,对于相同定位格架结构形式,不同压力、进出口温差、质量流速等热工参数条件下棒束通道出口截面子通道最高温度和最低温度的差值与进出口温差的比值没有明显变化趋势;交混翼主导了定位格架的交混作用,II型交混翼带来较强的交混作用;对于D型定位格架,非对称的条带结构会导致流场整体出现一定的偏转,一定程度上降低了定位格架的交混作用。

关键词：定位格架棒束通道温场分布

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CO_2 capture from binary mixture via forming hydrate with the help of tetra-n-butyl ammonium bromide

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Journal of Natural Gas Chemistry 2009年第1期18卷 15-20页

作者： Shifeng Li Shuanshi Fan Jingqu Wang xuemei lang Deqing Liang School of Chemical Engineering Dalian University of Technology Dalian 116012 Liaoning China The Key Laboratory of Enhanced Heat Transfer and Energy Conversation Ministry of Education South China University of Technology Guangzhou 510640 Guangdong China Center for Gas Hydrate Research Chinese Academy of Sciences Guangzhou 510640 Guangdong China

Hydrate formation rate and separation effect on the capture of CO2 from binary mixture via forming hydrate with 5 wt% tetra-n-butyl ammonium bromide （TBAB） solution were studied. The results showed that the induction time was 5 min, and the hydrate formation process finished in 1 h at 4.5 ℃ and 4.01 MPa. The hydrate formation rate constant reached the maximum of 1.84× 10^-7 molZ/（s.J） with the feed pressure of 7.30 MPa. The CO2 recovery was about 45 % in the feed pressure range from 4.30 to 7.30 MPa. Under the feed pressure of 4.30 MPa, the maximum separation factor and CO2 concentration in hydrate phase were 7.3 and 38.2 mol%, respectively. The results demonstrated that TBAB accelerated hydrate formation and enriched CO2 in hydrate phase under the gentle condition.

关键词： CO2 capture hydrate tetra-n-butyl ammonium bromide

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Rapid dissociation and on-site saturation evaluation of methane hydrate sediment samples for natural gas hydrate exploitation

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Petroleum 2021年第4期7卷 469-476页

作者： Shuanshi Fan Kai Guo Yanhong Wang xuemei lang Na Wei Qingping Li Key Lab of Enhanced Heat Transfer and Energy Conservation Ministry of EducationSchool of Chemistry and Chemical EngineeringSouth China University of TechnologyChina State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityNo.8 Xindu AvenueXindu DistrictChengdu610500PR China State Key Laboratory of Natural Gas Hydrate Beijing100028China

Natural gas hydrate is a kind of clean energy with huge reserves,and the saturation(volume percentage of hydrate in pore space of sediments)is the key parameter for determining whether the reservoir is worthy of exploitation.In this work,rapid hydrate dissociation by the combination of heat injection and NaCl inhibitor addition was studied,and an on-site evaluation method for hydrate saturation in sediment samples was proposed by using a core sampler to transfer hydrate samples under pressure.The results showed that the average gas production rate per unit volume was increased significantly to reach 7.22 L/Lr$min-1 by the injection of NaCl aqueous solution with 50.9C,which was attributed to the increase of the chemical potential to further accelerate the rate of hydrate dissociation in the presence of NaCl.Furthermore,for the measurement of methane hydrate samples saturation with a volume of 673 cm3(which contained 1.4 mol hydrates with the saturation of 58%),hydrate saturation could be accurately achieved within 30 min with a relative error lower than 11.7%This work may provide new thoughts for on-site saturation evaluation and rapid dissociation of hydrate samples during natural gas hydrate exploitation.

关键词： Natural gas hydrate Saturation Rapid on-site measurement NaCl solution Rapid dissociation

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Evidence for pore-filling gas hydrates in the sediments through morphology observation

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Chinese Journal of Chemical Engineering 2019年第9期27卷 2081-2088页

作者： Wenxiang Zhang Shuanshi Fan Yanhong Wang xuemei lang Kai Guo Jianbiao Chen Key Lab of Enhanced Heat Transfer and Energy Conservation Ministry of Education School of Chemistry and Chemical Engineering South China University of Technology

To provide an evidence of natural gas hydrate occurrence state,a series of experiments on multiple growth and dissociation of 90.0%methane/10.0%propane hydrates at 1.3 MPa and 270.15 K were carried out in two sediments for morphology observation via a visible jacketed-reactor.The gas hydrate crystals were observed to form and grow on the surface of sediments at the initial growth.During the thermal decomposition,gas and liquid products had an unceasingly impact on the sediments,then gas/liquid–solid migration occurred,and a large number of cavitation appeared.In the later growth and dissociation experiments,the gas hydrate particles were in suspension or supporting states in the interstitial pore space between the sediment particles,indicating that the gas hydrate displayed a pore-filling characteristics.Through analyzing the distribution of gas hydrates and bubbles,it was found that the amount of gas hydrates distributed in the sediments was improved with multiple growth-dissociation cycle proceedings.Gas migration enhanced the sediment movement,which led to the appearance of the increasing quantity of gas bubbles in the sediments during cycles.Salts affected the growth of the gas hydrates and the migration of sediment grains,which also restricted the accumulation of gas bubbles in the sediments.According to the Raman analysis,the results showed that sII hydrates were formed for CH4 and C3H8 gas mixtures in different sediments and solutions with hydration number of 5.84–6.53.The Salt restricted the access of gas into the hydrate cages.

关键词： Gas hydrate Sediments Growth Dissociation Pore-filling

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Kinetic hydrate inhibitor performance of new copolymer poly(N-vinyl-2-pyrrolidone-co-2-vinyl pyridine)s with TBAB

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Journal of Natural Gas Chemistry 2012年第2期21卷 126-131页

作者： Jun Hu Sijia Li Yanhong Wang xuemei lang Qingping Li Shuanshi Fan Key Laboratory of Enhanced Heat Transfer and Energy Conversation Ministry of EducationSchool of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510641GuangdongChina State Key Laboratory of Of fshore Oil Exploitation Beijing 100027China

In oil and gas field, the application of kinetic hydrate inhibitors （KHIs） independently has remained problematic in high subcooling and high water-cut situation. One feasible method to resolve this problem is the combined use of KHIs and some synergists, which would enhance KHIs’ inhibitory effect on both hydrate nucleation and hydrate crystal growth. In this study, a novel kind of KHI copolymer poly（N-vinyl-2-pyrrolidone-co-2-vinyl pyridine）s （HGs） is used in conjunction with TBAB to show its high performance on hydrate inhibition. The performance of HGs with different monomer ratios in structure II tetrahydrofuran （THF） hydrate is investigated using kinetic hydrate inhibitor evaluation apparatus by step-cooling method and isothermal cooling method. With the combined gas hydrate inhibitor at the concentration of 1.0 wt%, the induction time of 19 wt% THF solution could be prolonged to 8.5 h at a high subcooling of 6℃. Finally, the mechanism of HGs inhibiting the formation of gas hydrate is proposed.

关键词： clathrate hydrate kinetic hydrate inhibitors combined hydrate inhibitors poly（N-vinyl-2-pyrrolidone-co-2-vinyl pyridine）

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