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81.
石灰石在煤气化过程中的催化和固硫作用 总被引:1,自引:1,他引:1
基于CaO在煤气化中的催化和固硫作用,以及石灰石加热分解的性质,石灰石有可能作为煤气化过程中的催化剂和固硫剂。本文根据国内外对石灰石在煤燃烧和煤气化中作用的研究,从石灰石结构、Ca/C,Ca/S,可能的反应机理等几个方面进行了介绍和分析,并指出需进一步研究的内容。 相似文献
82.
介绍了在PKM气化炉中弱粘结性双阳煤的试烧情况,并给出了主要工艺参数控制范围。试烧结果表明:依兰煤中配入50%双阳煤,汽氧比6.0:1时,气化炉工况良好。 相似文献
83.
84.
S. R. Dargar L. J. Groven J. J. Swiatkiewicz J. A. Puszynski 《International Journal of Self-Propagating High-Temperature Synthesis》2007,16(3):125-132
The primary objective of this investigation was focused on in-situ densification of SHS composites synthesized from nanoreactants.
Simultaneous combustion synthesis and densification technique was utilized and it was found to be an effective method to form
dense intermetallic-ceramic composites. In this research study, two nanoreactant energetic systems, Al-TiO2 and Ni-Al-Al2O3, were explored. In-situ combustion synthesis and densification experiments were conducted in a uniaxial press with densification
pressures up to 200 MPa and preheating capability of 1500K. The experiments were conducted in both vacuum and Ar atmosphere.
Samples of titanium aluminides-alumina composites with density in the range of 95–98% have been obtained at a preheating temperature
of 860°C and pressure of 100 MPa. Reactants and SHS-produced materials were characterized by SEM, XRD, BET, and DSC/TGA. In
addition, more fundamental studies of the reaction kinetics as a function of average particle size of aluminum nanopowders
were conducted using DSC.
相似文献
85.
The results of conversion determinations on the products from Powhatan No.5 coal liquefied in an autoclave and in a high-pressure, high-temperature e.s.r. cavity are reported. Oil, asphaltene and preasphaltene yields, and overall conversion have been determined for Powhatan No.5 coal samples liquefied in tetralin, SRC-11 heavy distillate, and naphthalene at temperatures from 400 to 480 ° C in both reactor systems. The concept of reaction severity is introduced and used to formalize the relation between the effect of temperature and reaction time on oil yield and conversion. Oil is the predominant product in liquefaction in tetralin or naphthalene, asphaltene is the major product of liquefaction in SRC-II heavy distillate. Retrogressive reaction (THF-insoluble product formation) becomes severe when SRC-II heavy distillate is the liquefaction solvent and residence time of >10 min are used at temperatures >450 °C. Preasphaltenes appear to be the only intermediate species in Powhatan No.5 liquefaction. 相似文献
86.
Combustion tests were carried out with Minto coal in combination with three different limestones in the University of British Columbia (UBC) pilot scale (152 mm square x 7.3 m tall) circulating fluidized bed combustion (CFBC) unit. Operating conditions were chosen to be typical of those employed in large-scale CFBC power boilers. Recycling of fine particles captured by the secondary cyclone was found to be of considerable importance in increasing sulphur capture, enhancing combustion efficiency and reducing the amount of calcium sulphide in the solids residues. NOx emissions increased as the Ca:S ratio increased. Local gas concentrations inside the reactor were strongly influenced by the core-annulus solids distribution patterns which characterize circulating fluidized beds. 相似文献
87.
煤炭资源是我国社会发展的重要能源之一,在煤炭资源开采过程中,必须对煤矿的地质结构进行认真分析。重点分析了煤矿地质结构与煤矿开采的关系,通过对煤矿地质结构的发展规律进行分析,建立了一套完善的煤矿地质构造评价指标系统,从而为煤矿资源的安全开采提供了保障。 相似文献
88.
优化配置不同种类、不同性质的煤炭,将其掺配成在综合性能上呈最佳状态的新煤种,满足锅炉在不同条件下的各种需要;开发数字化煤场,实现煤场的数字化动态管理。主要分析、研究了数字化煤场和配煤掺烧技术的实施要点。 相似文献
89.
Consuelo Montes de Correa H. Ai´da Luz Villa 《Applied catalysis. B, Environmental》1996,10(4):313-323
The effect of Pd-loading on Pd-NaZSM-5 and Pd-NaMordenite catalysts prepared by ion exchange was studied for methane combustion with excess oxygen (1% CH4, 18% O2, balance N2) in the temperature range 40–500°C. Fresh and calcined samples (3 h, 450°C) showed methane conversions proportional to Pd-loading on Pd-NaZSM-5 catalysts, while conversions decreased with Pd-loading on calcined Pd-NaMordenite catalysts. TOF (number of methane molecules converted per second per Pd2+ ion) for over exchanged Pd-NaZSM5-116 was low as compared to under exchanged Pd-NaZSM5-80 and Pd-NaZSM5-58 samples. Close TOF's were found for the last two samples at 330°C. TOF differences in Pd-NaMordenite catalysts demonstrate the heterogeneity of Pd+2 sites due to structurally nonidentical locations of cations. TOF's appear to be related to Na/Pd ratios in both catalyst types. Apparent activation energies for Pd-NaZSM-5 materials are higher than those for Pd-NaMordenite catalysts. 相似文献
90.