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新式整体脱硫工艺的硫汞联合脱除特性及影响因素 总被引:1,自引:0,他引:1
选取1台100MW燃煤锅炉的一体化新式整体脱硫(NID)系统为研究对象,对其入炉煤样、底渣、预除尘器灰、新鲜脱硫剂、循环脱硫混合灰和烟气等进行取样分析,获得了汞、SQ2排放浓度和不同运行工况下NID系统的硫、汞联合脱除特性及其影响因素.结果表明:消化度的提高使得消化产物的比表面积增大,孔隙结构更发达,从而更有利于消化产物对SOx和Hg的吸附脱除;随着水钙比、消化水温度及生石灰品质的提高,系统的脱硫效率以及脱硫灰中汞的富集系数均有增大的趋势;NID系统的脱硫效率为84.86%~97.28%,脱汞效率可达86.6%~92.2%. 相似文献
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新型一体化半干法脱硫系统同时脱汞的试验研究与微观机理分析 总被引:1,自引:0,他引:1
对某台安装有新型一体化烟气脱硫(NID)系统的燃煤电站锅炉的煤、底渣、飞灰进行取样,测定了样品中汞的含量.并采用Ontario-Hydro 方法测定了 NID 系统前后烟气中汞的形态.利用比表面积及孔隙度分析仪、X衍射仪、扫描电镜和能谱仪对 NID 系统中各种灰的物理化学特性进行了分析,揭示了 NID 半干法脱硫系统同时脱除烟气中Hg的微观机理.结果表明:在 NID 半干法脱硫系统中,消石灰与飞灰可以充分混合,脱硫塔内飞灰循环倍率高,混合灰表面始终有新鲜的脱硫剂 Ca(OH)z,而且脱硫塔内有水合硅酸钙形成,颗粒团聚严重,对脱除烟气中的SO2 和 Hg 非常有利.NID 半干法脱硫系统对烟气中总汞的脱除效率高达86.6%~92.2%,对燃煤电站汞排放的控制效果显著. 相似文献
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生石灰掺加粉煤灰脱硫性能研究 总被引:1,自引:0,他引:1
在沉降炉和热分析仪上进行的脱硫实验表明 :生石灰掺加粉煤灰可以提高烟气脱硫率和脱硫剂的钙利用率。这种作用与反应温度有关 ,反应温度为 550~ 70 0℃时 ,效果最好。同时也研究了粉煤灰与生石灰掺混方式对烟气脱硫率和脱硫剂的钙利用率的影响。 相似文献
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活性焦孔结构及表面性质对脱除烟气中SO2的影响 总被引:4,自引:0,他引:4
对两种不同方法得到的比表面积相近但脱硫性能差别甚大的活性焦,进行了孔结构、表面化学特性的表征,并进行了脱硫性能的测试.结果表明,活性焦的脱硫性能与其比表面积的关系不大,孔径分布对其存在一定的影响,而活性焦的表面化学特性(表面官能团的种类和浓度)对脱硫性能有很大的影响,在实验分析得到的C-C、C-O、CO、COOH及π-π·
5种官能团中,羰基官能团(CO)和醚基官能团(C-O)的总浓度的大小与活性焦的脱硫性能表现出极大的相关性,这两种官能团的浓度越高,活性焦的脱硫性能越强,并对应较大的苯甲酸吸附值,因此可以推断这两种官能团对活性焦的表面碱性起了主要的贡献,并且决定着活性焦脱硫活性的大小. 相似文献
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Anna Grzech Jie Yang Piotr J. Glazer Theo J. Dingemans Fokko M. Mulder 《International Journal of Hydrogen Energy》2014
The low temperature hydrogen adsorption capacity of mesopores silica aerogel was investigated and compared with that of other large pore silica based materials (MCM-41, HMS) within a range of surface area and large (2 nm) to very large (20 nm) pore sizes. The hydrogen uptake of the aerogel measured at pressure of 1 bar and a temperature of 77 K is around 2.5 times lower than that of MCM-41, although it has a comparable specific surface area (just 30% smaller). The explanation found is the relation between lower hydrogen heat of adsorption and larger pore size for the investigated materials, which leads to higher surface coverage in the smaller pores. 相似文献
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Development of templated carbon by carbonisation of sucrose–zeolite composite for hydrogen storage
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The templated carbons were synthesised by carbonisation of a zeolite–sucrose composite. The effects of carbonisation temperature and dwelling time on the development of pore structure of templated carbon were investigated. Various characterisation techniques were employed to investigate the structural and topographical properties of template precursor as well as synthesised carbons. The highest total surface area of 1033 m2/g and micropore area of 647 m2/g were obtained for carbon synthesised at 750°C with 3 h dwelling time. It was observed that at lower carbonisation temperature or dwelling time, the surface area and pore volume were lower, which may be attributed to incomplete carbonisation of the sucrose. At higher carbonisation temperature or dwelling time, the decrease in surface area and pore volume could be the result of collapse of the pore structure. Maximum 80% micropore area was observed for the templated carbons depending on the synthesis conditions. The hydrogen uptake of the templated carbons was measured by temperature‐programmed desorption at 1 bar pressure and different subzero temperatures. The maximum uptake (0.30 wt%) was obtained at 1 bar and ?100°C for templated carbon, having a surface area of 1033 m2/g, prepared at 750°C with 3 h dwelling time. This templated carbon had the highest total surface area as well as micropore area. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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季节冻土区粉质粘土冻融过程结构演变试验研究 总被引:1,自引:0,他引:1
为考察不同冻结状态下冻融作用对粉质粘土表面孔隙结构的影响规律,利用氮气吸附法,对黑龙江省哈尔滨市万家地区的粉质粘土冻融前、冻融中和冻融后三种不同状态进行试验研究,分析了不同冻结状态下的孔隙结构变化特征。试验结果表明,冻融前、冻融中以及冻融后土的微观结构特征有一定的变化,表现为土样冻融后孔的比表面积较冻融前增加1.9%,冻融中土孔的比表面积较冻融前减少5.9%;冻融中的微孔孔容最大,冻融前的微孔孔容最小;冻融后的中孔累积孔容增加,冻融中的累积孔容减小,冻融前后孔隙的总体分布趋势无明显的变化。 相似文献