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在N2气氛下,对空干基污泥进行了低温热解实验,共检测到5种含硫气体,分别是H2S、SO2、CS2、COS和CH3SH,其中H2S、SO2及CH3SH是主要成分.通过XPS测定污泥样品和焦中各形态硫的变化,发现热解温度低于350,℃时,主要是脂肪族硫分解,其他形态硫变化不大.在此基础上,向污泥中添加了两种脂肪族有机硫,以研究脂肪族硫对含硫气体释放的影响,添加后,发现H2S的释放量剧烈增大,SO2和CH3SH的增加量相对较少,同时H2S释放量的增加促进了COS和CS2的生成. 相似文献
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为研究煤热解与挥发份燃烧过程中SO2对NO的影响,在燃烧综合实验台上研究了硫含量、煤种等因素在煤热解与挥发份燃烧过程中对SO2生成量、NO生成量等的影响。结果表明,SO2的生成对燃烧过程中NO的生成具有一定影响和作用。但不同的煤种硫的析出与氧化对NO的生成影响和作用有所不同,挥发份含量高、活化能低的煤,与NO之间的交互作用较强。铜川贫煤和宜宾无烟煤,原煤中的固有硫和添加硫总量分别达到4.34%和5.17%以上时,硫的热解和氧化过程才对NO的生成有较明显的影响;而对神木烟煤,原煤中的固有硫和添加硫总量达到2.0%时,硫的热解和氧化就对NO的生成起到了明显的作用。图10表3参6 相似文献
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还原条件下煤中硫的转化 总被引:1,自引:0,他引:1
在小型流化床实验台上对还原条件下硫化物的生成进行了研究.实验结果表明,还原态条件下燃料中的硫首先生成H2S,以及少量的SO2.作者认为SO2主要是由硫酸盐的分解形成的.H2S产生速率受还原性气氛、有机硫比例以及含氧量的影响很大,还原性越强,有机硫比例越大,含氧量越低产生的H2S越多;H2S产生的速率还与煤中挥发份含量和有机硫含量有关,挥发份含量越高,有机硫含量越低,H2S产生越早;低按发份和低有机硫含量的煤在强还原性气氛下容易生成单质硫.因此,循环流化床的脱硫过程中必须采取有效措施去除燃烧过程中产生的H2S,特别对于燃烧高硫煤种.图6表2参12 相似文献
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通过自制SO2监测实验系统对煤粉/生物质进行恒温混燃SO2监测实验,探讨了掺混比、煤种、生物质种类以及温度等因素对煤粉/生物质恒温混燃SO2排放特性的影响规律.研究表明:燃烧初期,燃烧进行的越快,SO2析出率越高.随着燃烧的进行,生物质掺混比增加有利于燃料的SO2析出率降低;SO2析出率较高的煤粉掺混生物质降低SO2析出的作用效果比SO2析出率较低的煤粉掺混更明显;掺混含硫量高的生物质在燃烧初期降低燃料SO2析出作用效果明显.随着燃烧的进行,生物质灰分含量的影响作用逐渐增大,灰分含量越高,降低效果越明显;温度升高总是有利于混合燃料的SO2析出率增加,且温度区间越高燃料的SO2析出率增加越显著. 相似文献
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《International Journal of Hydrogen Energy》2023,48(53):20176-20192
Decomposition of sulphur trioxide (SO3) is highly endothermic, catalytic and overall rate-controlling step, in three-step decomposition of sulphuric acid. SO3 decomposition in Packed Bed Reactor (PBR) involves transport resistances in two (multi) scales; macro-voids and micro-pores together with surface reaction. Objective of the present study is to develop a double porosity (multi-scale) model, DPM for the catalytic decomposition of SO3 in a heat recuperated (integrated)-PBR and also to maximize SO3 conversion. DPM and simulation studies are carried out using COMSOL® and the model is validated with experimental studies. Experiments are performed at different flow rates, wall temperature, feed concentration and with two catalyst loadings, where chromium doped iron oxide ‘foam’ type (porous particle) catalyst is used. Simulation study shows, increase in conversion with decrease in particle size, annular gap and with increase in porosity, thermal conductivity of catalyst. Catalyst size is found to be an insignificant parameter, for porosity >0.2 and thermal conductivity is found to be a significant parameter. A conversion close to isothermal conversion has been obtained with the tuned parameters. 相似文献
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In this study, a parametric investigation is carried out to estimate the hydrogen energy potential depending on the quantities of H2S in Black Sea deep waters. The required data for H2S in Black Sea deep waters are taken from the literature. For this investigation, the H2S concentration and water layer depth are taken into account, and 100% of conversion efficiency is assumed. Consequently, it is estimated that total hydrogen energy potential is approximately 270 million tons produced from 4.587 billion tons of H2S in Black Sea deep waters. Using this amount of hydrogen, it will be possible to produce 38.3 million TJ of thermal energy or 8.97 million GWh of electricity energy. Moreover, it is determined that total hydrogen potential in Black Sea deep waters is almost equal to 808 million tons of gasoline or 766 million tons of NG (natural gas) or 841 million tons of fuel oil or 851 million tons of natural petroleum. These values show that the hydrogen potential from hydrogen sulphur in Black Sea deep water will play an important role to supply energy demands of the regional countries. Thus, it can be said that hydrogen energy reserve in Black Sea is an important candidate for the future hydrogen energy systems. 相似文献
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James T. Hinkley Jessica A. O’BrienChristopher J. Fell Sten-Eric Lindquist 《International Journal of Hydrogen Energy》2011,36(18):11596-11603
The hybrid sulphur process is one of the most promising thermochemical water splitting cycles for large scale hydrogen production. While the process includes an electrolysis step, the use of sulphur dioxide in the electrolyser significantly reduces the electrical demand compared to conventional alkaline electrolysis. Solar operation of the cycle with zero emissions is possible if the electricity for the electrolyser and the high temperature thermal energy to complete the cycle are provided by solar technologies.This paper explores the possible use of photovoltaics (PV) to supply the electrical demand and examines a number of configurations. Production costs are determined for several scenarios and compared with base cases using conventional technologies. The hybrid sulphur cycle has promise in the medium term as a viable zero carbon production process if PV power is used to supply the electrolyser. However, the viability of this process is dependent on a market for hydrogen and a significant reduction in PV costs to around $1/Wp. 相似文献