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超临界水热燃烧技术研究及应用进展 被引量:4
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作者 李艳辉 王树众 +4 位作者 任萌萌 张洁 徐东海 钱黎黎 孙盼盼 《化工进展》 EI CAS CSCD 北大核心 2016年第7期1942-1955,共14页
超临界水热燃烧技术作为一种新型的高效清洁燃烧技术,为实现有机废物处理、稠油资源高效开发、煤基固体燃料清洁转化利用、新型钻井技术开发及劣质燃料品质提升等提供了一条崭新的途径,具有广阔的发展前景。本文概述了超临界水热燃烧的... 超临界水热燃烧技术作为一种新型的高效清洁燃烧技术,为实现有机废物处理、稠油资源高效开发、煤基固体燃料清洁转化利用、新型钻井技术开发及劣质燃料品质提升等提供了一条崭新的途径,具有广阔的发展前景。本文概述了超临界水热燃烧的提出、发展历程及其技术优势,评述了不同燃料的水热火焰特性、水热燃烧反应器形式以及水热燃烧技术工程应用方面的研究现状。指出对于特定燃料,水热燃烧反应器具有较低的燃料熄火温度是提高反应器内水热火焰稳定性的关键。水热燃烧反应器开发过程中水热火焰区的结构布置需综合考虑蓄热需求与反应器壁面安全。水热火焰特性与超临界水中传热传质的耦合机制、水热燃烧过程数值模拟、光-超临水-氧气复杂环境下的材料腐蚀特性、水热火焰辅助降解有机废物、生产多元热流体辅助稠油开采、煤基固体燃料的水热燃烧是超临界水热燃烧领域未来研究热点。 展开更多
关键词 超临界水 水热燃烧 水热火焰 反应器 废物处理
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Pr-CeO_2纳米稀土颜料的低温燃烧-水热合成及其表征 被引量:3
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作者 朱振峰 周燕 王宝利 《陶瓷学报》 CAS 2006年第1期25-28,共4页
以C(eNO3)3·6H2O,Pr6O11为主要原料,利用低温燃烧-水热合成制备了具有纳米晶粒的Pr-CeO2红色稀土颜料。通过XRD,SEM,EDS,XPS对制备出的Pr-CeO2红色稀土颜料进行了测试分析。结果表明:Pr掺杂进入CeO2晶格,形成固溶体,为单一相的萤... 以C(eNO3)3·6H2O,Pr6O11为主要原料,利用低温燃烧-水热合成制备了具有纳米晶粒的Pr-CeO2红色稀土颜料。通过XRD,SEM,EDS,XPS对制备出的Pr-CeO2红色稀土颜料进行了测试分析。结果表明:Pr掺杂进入CeO2晶格,形成固溶体,为单一相的萤石型结构。Pr主要是以+3价的形式存在于Pr-CeO2固溶体中,该固溶体中未发现+4价的Pr。水热处理后的颜料粉体晶粒发育更完整,尺寸更均匀,平均尺寸为16.70nm,粉料的呈色性能比水热处理前有明显改善。 展开更多
关键词 低温燃烧-水热合成 Pr-CeO2 稀土颜料 纳米晶体
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超临界水氧化/气化反应器的CFD模拟研究进展 被引量:1
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作者 唐旭 陈海峰 +2 位作者 阳明君 徐愿坚 陈忠 《应用化工》 CAS CSCD 北大核心 2021年第2期504-510,515,共8页
基于前期研究和国内外相关文献,分别从数学模型、物性数据和模拟实例三个方面回溯了CFD的发展历程,综述了最新研究进展。总结出RNG k-ε、EDC分别是纯流态、湍流-化学反应两种体系普遍采用且模拟效果最好的模型,但在面对水热燃烧、水膜... 基于前期研究和国内外相关文献,分别从数学模型、物性数据和模拟实例三个方面回溯了CFD的发展历程,综述了最新研究进展。总结出RNG k-ε、EDC分别是纯流态、湍流-化学反应两种体系普遍采用且模拟效果最好的模型,但在面对水热燃烧、水膜形成和非均相催化等典型水热过程时,仍不能有效兼顾流体力学问题与化学反应问题;其次,超临界水热环境下多相流体的基础物性数据匮乏是CFD模拟研究的另一瓶颈;最后,指出了开发新模型并结合原位探测实验新技术是未来的重点研究方向。 展开更多
关键词 反应器结构 水热燃烧 模拟 超临界水氧化 超临界水气化
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Simulation study on combustion system of tankless gas water heater
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作者 邱步 张小松 窦礼亮 《Journal of Southeast University(English Edition)》 EI CAS 2010年第2期187-191,共5页
This paper simulates the combustion system of a regular tankless gas water heater under different static pressure conditions.The simulation results are in accordance with the test results.It proves that the used physi... This paper simulates the combustion system of a regular tankless gas water heater under different static pressure conditions.The simulation results are in accordance with the test results.It proves that the used physical and mathematical models are reasonable.The results show that the flame height and the excess air ratios depend on the system pressure drop but not on the absolute pressure at the combustion chamber.The pressure drop and the amount of combustion air have an inverse relationship with CO generation,and they also impact on the temperature and velocity fields.To reduce CO emission,a stronger fan is needed to provide extra pressure head to ensure that enough combustion air is introduced into the system.This study provides a useful research tool to develop products through computational fluid dynamic analysis and laboratory testing. 展开更多
关键词 tankless gas water heater combustion system CO emission computational fluid dynamics(CFD) static pressure
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Determination of Hydrogen Production from Rich Filtration Combustion with Detailed Kinetics Based CFD Method 被引量:4
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作者 李国能 周昊 +1 位作者 钱欣平 岑可法 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2008年第2期292-298,共7页
Computational fluid dynamics (CFD) combined with detailed chemical kinetics was employed to model the filtration combustion of a mixture of methane/air in a packed bed of uniform 3 mm diameter alumina spherical part... Computational fluid dynamics (CFD) combined with detailed chemical kinetics was employed to model the filtration combustion of a mixture of methane/air in a packed bed of uniform 3 mm diameter alumina spherical particles. The standard k-ε turbulence model and a methane oxidation mechanism with 23 species and 39 elemental reactions were used. Various equivalence ratios (1.47, 1.88, 2.12 and 2.35) were studied. The numerical results showed good agreement with the experimental data. For ultra-rich mixtures, the combustion temperature exceeds the adiabatic value by hundreds of centigrade degrees. Syngas (hydrogen and carbon monoxide) can be obtained up to a mole fraction of 23%. The numerical results also showed that the combination of CFD with detailed chemical kinetics gives good performance for modeling the pseudo-homogeneous flames of methane in porous media. 展开更多
关键词 computational fluid dynamics coupled chemistry-hydrodynamics porous media super-adiabatic combustion
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Low-temperature Synthesis of Belite Cement from Reactive Mixtures Based on Coal Fly Ash 被引量:1
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作者 Nadezda Stevulova Ivana Filkova Kestutis Baltakys 《Journal of Civil Engineering and Architecture》 2012年第2期189-196,共8页
This paper summarizes the selected results of an extensive investigation of application of two methods (hydrothermal and mechanochemical) assisted by calcination for synthesizing belite cement from reactive mixtures... This paper summarizes the selected results of an extensive investigation of application of two methods (hydrothermal and mechanochemical) assisted by calcination for synthesizing belite cement from reactive mixtures (CaO/SiO2 molar ratio of 2) consisting of various waste kinds from fluidized brown coal combustion in Slovakian power plant and CaO addition. Based on XRD diffraction patterns and infrared spectra ofpre-treatment products, the formation of the new profiles corresponding to CSH phases with low degree of ordering as belite precursors after hydrothermal treatment as well as metastables calcium silicates and aluminosilicates in mechanosynthesized products was confirmed. Calcination of hydrothermally treated products led to transformation of CSH phases to wollastonite (CS), belite and gehlenite phase, whereas creation oft^- and I^-C2S or wollastonite in milled reactive mixture took place. Differences in phase composition of products before and after calcination depend upon waste quality and precursor's synthesis conditions. Bottom ash isn't suitable as raw material for synthesizing belite phase because of high CaO content fixed in anhydrite form (44.1%). Coal fly ash with low CaO content in anhydrite form (4.2%) and its mechanochemical or hydrothermal treatment in combination with subsequent heating offer opportunities for the utilization of coal fly ash as raw material for belite production. 展开更多
关键词 Coal fly ash hydrothermal pre-treatment MECHANOSYNTHESIS belite.
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Numerical investigation of optimal geometry parameters for ejectors of premixed burner
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作者 刘凤国 张蕊 +2 位作者 刘文博 翟军 郑斌 《Journal of Central South University》 SCIE EI CAS 2014年第3期1011-1016,共6页
An ejector of low NO~ burner was designed for a gas instantaneous water heater in this work. The flowing and mixing process of the ejector was investigated by computational fluid dynamics (CFD) approach. A comprehen... An ejector of low NO~ burner was designed for a gas instantaneous water heater in this work. The flowing and mixing process of the ejector was investigated by computational fluid dynamics (CFD) approach. A comprehensive study was conducted to understand the effects of the geometrical parameters on the static pressure of air and methane, and mole fraction uniformity of methane at the outlet of ejector. The distribution chamber was applied to balance the pressure and improve the mixing process of methane and air in front of the fire hole. A distribution orifice plate with seven distribution orifices was introduced at the outlet of the ejector to improve the flow organization. It is found that the nozzle exit position of 5 mm and nozzle diameter d 〉1.3 mm should be used to improve the flow organization and realize the well premixed combustion for this designed ejector. 展开更多
关键词 EJECTOR computational fluid dynamics (CFD) bumer distribution orifice premixed combustion
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Development of Preliminary Design Program for Combustor of Regenerative Cooled Liquid Rocket Engine 被引量:3
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作者 Won Kook Cho Woo Seok Seol +2 位作者 Min Son Min Kyo Seo Jaye Koo 《Journal of Thermal Science》 SCIE EI CAS CSCD 2011年第5期467-473,共7页
An integrated program was established to design a combustor for a liquid rocket engine and to analyze regenerative cooling results on a preliminary design level.Properties of burnt gas from a kerosene-LOx mixture in t... An integrated program was established to design a combustor for a liquid rocket engine and to analyze regenerative cooling results on a preliminary design level.Properties of burnt gas from a kerosene-LOx mixture in the combustor and rocket performance were calculated from CEA which is the code for the calculation of chemical equilibrium.The heat transfer of regenerative cooling was analyzed by using SUPERTRAPP code for coolant properties and by one-dimensional correlations of the heat transfer coefficient from the combustor liner to the coolant.Profiles of the combustors of F-1 and RS-27A engines were designed from similar input data and the present results were compared to actual data for validation.Finally,the combustors of 30 tonf class,75 tonf class and 150 tonf class were designed from the required thrust,combustion chamber,exit pressure and mixture ratio of propellants.The wall temperature,heat flux and pressure drop were calculated for heat transfer analysis of regenerative cooling using the profiles. 展开更多
关键词 Liquid rocket engine Preliminary design of Combustor Regenerative cooling
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