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本文结合对煤燃烧中硫析出规律与型煤燃烧固硫特性进行的探讨,介绍提高型煤固硫效率方面的试验研究结果,研究表明:型煤固硫效率不仅与固硫剂的粒度,成分密切相关,还与型煤的燃烧方式,运行参数(湿度,过剩空气系数,Ca/S比,燃烧时间等)相联系,通过合适的配制固硫剂,并加入适当的添加剂,可有效提高型煤固硫效率。 相似文献
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型煤固硫剂固硫特性的研究 总被引:1,自引:0,他引:1
利用石灰石,生石灰,电石渣,造纸废渣和赤泥作为型煤固硫剂,在燃烧温度为300 ̄1050℃,钙硫比值为0.89 ̄6.53的范围内,对其燃烧固硫特性进行了试验研究,分别得到最佳固硫温度及加入量范围。试验证明,在模拟工业链条炉温度特性下,7种复合固硫剂的固硫效率比纯钙基固硫剂提高12% ̄27%。 相似文献
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牛焱 《煤炭加工与综合利用》2004,(4):36-39
对固硫型煤的固硫机理进行了研究分析 ,论述了固硫型煤的固硫效果以及对环境的改善 ,结合国内现阶段固硫型煤的发展状况 ,提出了发展固硫型煤的看法。 相似文献
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生物质型煤固硫性能研究及经济性分析 总被引:2,自引:2,他引:2
对生物质型煤固硫机理进行了理论分析 ,通过实验研究了 Ca/S,固硫剂种类及型煤含硫量对固硫率的影响 .结果表明 ,固硫率随 Ca/S比增大而提高 ,Ca/S=1 .5~ 2范围内 ,固硫率趋于最大值 ,当 Ca/S比大于 2后 ,固硫率随 Ca/S增加的趋势显著变缓 ;在同一 Ca/S比下 ,Ca( OH) 2 的固硫效果最好 ,Ca O次之 ,Ca CO3 的固硫效果最差 ;型煤含硫 3%以下 ,固硫率与含硫量成正比 ,含硫量继续增加 ,固硫趋势不断减缓 .通过对生物质型煤固硫费用的分析 ,得出生物质型煤固硫技术是可行的 . 相似文献
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煤灰成分对燃煤固硫效果的影响 总被引:2,自引:0,他引:2
根据煤灰成分及其硫酸盐的稳定性分析了煤炭燃烧固硫的效果。得出了降低煤灰中高价的铝元素及高价过渡金属元素含量和提高低价活泼金属元素的含量都可以提高煤炭燃烧固硫效果。 相似文献
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Chemical looping combustion (CLC) is an energy conversion technology with high efficiency and inherent separation of CO2.The existence of sulfur in coal may affect the CO2 purity and the performance of oxygen carrier due to the interactions between sulfur contaminants and oxygen carrier.The migration of sulfur in Beisu coal during the in-situ gasification chemical looping combustion (iG-CLC) process using two oxygen carriers (iron ore and CuO/SiO2) was investigated respectively.The thermodynamic analysis results showed the formation of metal sulfides was thermodynamically favored at low temperatures and low oxygen excess coefficients,while they were obviously inhibited and the production of SO2 was signifi-cantly promoted with an increase in temperature and oxygen excess coefficient.Moreover,part of sulfur was captured and fixed in the forms of alkali/alkaline earth metal sulfate due to the high amount of alkali/alkaline earth metal oxides in the coal ash or/and oxygen carrier.The experimental results showed that the sulfur in coal mainly released in the form of SO2,and the sulfur conversion efficiency (Xs) in the reduction stage were 51.04% and 48.24% when using iron ore and CuO/SiO2 respectively.The existence of metal sulfides was observed in the reduced oxygen carriers.The values of Xs in the reoxidation process reached 3.80% and 7.64% when using iron ore and CuO/SiO2 respectively.The residue and accumulation of sulfur were also found on the surfaces of two oxygen carriers. 相似文献
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A new model, which combines in-bed and freeboard sulfation, significantly improves the ability to predict sulfur capture by limestone sorbents in fluidized-bed coal combustors. In this model, the in-bed hydrodynamics are described in terms of a bubble phase and an emulsion phase while the freeboard region has only a diluted emulsion phase. The solids, which are in the emulsion phases, are considered to be completely back-mixed; the gaseous bubble phase travels in plug-flow but exchanges with the emulsion phase. The sulfation reaction occurs principally in the emulsion phase and the reaction rate is a direct function of the sulfur dioxide concentration, the extent of the calcium oxide conversion (as measured by a thermogravimetric analyzer), and the amount of limestone present in the bed and in the freeboard. The amount present, or holdup, in the free-board is calculated from empirical correlations for elutriation and from particle-time trajectories as predicted from equations of motion.The model indicates that a significant amount of sulfur capture can occur in the freeboard region, especially with high superficial gas velocities and small particle sizes, both of which lead to increased freeboard holdup. For an overall sulfur retention of 90%, approximately 9% of the sulfur is predicted to be captured within the freeboard above a combustor bed 1.8 m by 1.8 m by 1.2 m high of 1200 μm diameter limestone particles that are fluidized at 2.4 m/s. The model also predicts that the sulfur captured by the entrained particles is negligible. These predictions compare favorably with the actual sulfur retentions experienced in similar sized pilot-scale combustors. 相似文献