共查询到16条相似文献,搜索用时 156 毫秒
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煤及其模型化合物电解氧化脱硫的热力学分析 总被引:3,自引:0,他引:3
根据煤的分子结构理论及热力学原理,对铁矿和有机含硫模型化俣物在标准状态下电解氧化硫的理论分解电压进行了计算,分析了电化学法脱除煤中有机硫和黄铁矿的可能性及脱硫深度,讨论了提高脱硫效率和选择性的可能途径。 相似文献
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碱性体系中煤中有机硫的电化学脱除研究 总被引:2,自引:1,他引:1
以高硫煤为原料,用化学法将其无机硫脱除后,再以此作为电解煤样,在碱性条件下研究了煤中有机硫的电化学脱硫规律。讨论了电解电流、煤浆浓度、NaOH浓度等主要因素对煤中有机硫脱硫率的影响,并确定了适宜电解脱硫条件:NaOH质量浓度4.0mol/L,煤浆质量浓度0.04g/mL,反应温度70℃,电流强度1.0A,电解时间5h,获得了有机硫脱除率为32.50%的较好效果。 相似文献
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还原剂法强化煤浮选脱硫的研究 总被引:1,自引:0,他引:1
为了拓宽电化学法在煤脱硫中的应用,研究了还原剂法脱硫的几个影响因素及其脱硫机理,利用X射线衍射对还原剂法处理前后的黄铁矿样进行了分析。结果表明:影响还原剂法脱硫的因素的次序为反应时间>pH值>还原剂用量>反应温度;确定了最佳反应条件,反应时间为20 min,pH=6.65,还原剂(连苯三酚)用量为75 mg,反应温度为30℃;在较优实验条件下,其脱硫率可达到60%。研究表明,还原剂法能使煤与黄铁矿颗粒表面朝不同的方向改性:提高了煤的可浮性,降低了黄铁矿的可浮性;同时还原剂法还能改善煤质,提高煤的燃烧值。 相似文献
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为研究HCl电解质体系中电化学脱硫对煤质的影响,利用扫描电镜(SEM)、X射线荧光光谱(XRF)、X-射线衍射(XRD)、红外光谱(FT-IR)等分析方法对原煤和脱硫后煤样进行成分分析,研究煤中矿物化学成分、矿物元素含量、黄铁矿分布形态、煤表面官能团变化等。结果表明,在电解质为HCl,电流密度0.044 A/cm2,煤浆质量浓度0.02 g/m L,电解质浓度0.75 mol/L,煤粒度小于0.5 mm的条件下,电化学脱硫法可有效脱除煤中硫,全硫脱除率为76.32%,其中有机硫、无机硫脱除率分别为62.32%和82.80%,基本实现无机硫和有机硫的同步脱除;煤中灰分较脱硫前降低了9.38%,精煤发热量增加了0.70 MJ/kg,表明电化学脱硫法基本不破坏煤的原有结构,有助于改善煤质。 相似文献
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G. Olsson B.-M. Pott L. Larsson O. Holst H.T. Karlsson 《Fuel Processing Technology》1994,40(2-3):277-282
Several different microorganisms have been suggested for coal desulfurization. In the present investigation, the thermophilic archaea Acidianus brierleyi (DSM 1651), Sulfolobus acidocaldarius (DSM 639) and Sulfolobus solfataricus (DSM 1616) were compared with the mesophilic bacterium Thiobacillus ferrooxidans (DSM 583) concerning their capability of removing sulfur from coal. The desulfurization rate as well as the amount of sulfur removed by the microorganisms was studied.
Two of the investigated microorganisms, Thiobacillus ferrooxidans and Acidianus brierleyi, were capable of oxidizing pure pyrite as well as oxidizing sulfur in coal. A kinetic analysis was performed assuming first order reactions. The rate constant for oxidation of pure pyrite by A. brierleyi was observed to be higher than for T. ferrooxidans. The values of the rate constants for sulfur removal from coal were comparable for the two microorganisms, but were higher than for oxidation of pure pyrite. 相似文献
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生物脱硫技术具有环境和过程友好等特点,在煤炭脱硫领域具有重要的应用开发前景。本文主要研究了嗜酸氧化亚铁硫杆菌(Acidithiobacillus ferrooxidans)和嗜酸氧化硫硫杆菌(Acidithiobacillus thiooxidans)混合菌群对高硫煤生物的脱硫工艺,分别考察了空气氧化环境、CO2辅助气氛下的脱硫效果。实验结果表明,A. ferrooxidans和A. thiooxidans混合菌群在空气氧化环境下具有良好的脱硫能力,两种嗜酸好氧菌表现出一定的协同作用,无机硫脱除率可达70%;而CO2辅助能够显著提高有氧条件下菌群的脱硫效率,无机硫脱除率可达90%以上。通过扫描电镜(SEM)、红外光谱(FTIR)、X射线衍射(XRD)、X射线光电子能谱技术(XPS)等表征手段对脱硫后的煤炭结构变化和发酵脱硫机制进行研究,引入的CO2一方面为两种好氧菌在发酵条件下提供碳源,促使菌群快速生长增殖;另一方面部分CO2溶于水使发酵溶液中碳酸根离子浓度发生改变,实现降低发酵脱硫产物黄钾铁矾在煤粒表面的沉积密度,促进生物脱硫过程的进行。 相似文献
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一种高有机硫煤的化学药剂脱硫研究 总被引:6,自引:0,他引:6
选择复合脱硫剂在酸性条件下研究脱硫条件(煤浆浓度、处理时间、复合脱硫剂的浓度及溶液酸度)对高有机硫煤总硫、无机硫和有机硫脱硫率的影响.研究表明,煤浆浓度越低、处理时间越长、复合脱硫剂的浓度越大、处理溶液的酸度越大,总硫、无机硫和有机硫的脱硫率越大,最后对处理液和脱硫精煤进行了组分分析,探讨了酸性条件下复合脱硫剂脱除煤中总硫的反应及脱硫机理. 相似文献
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Gregory J. Olson 《Fuel Processing Technology》1994,40(2-3):103-114
Recent developments in microbiological desulfurization of coal are reviewed. Microbiological removal of organic sulfur from coal remains to be proven conclusively, but is under active study for petroleum biodesulfurization. Microbiological removal of pyritic sulfur from coal is well established in the laboratory and recent efforts have been aimed at scale-up designs and process considerations. Microbiological depyritization may be as inexpensive as other forms of advanced coal desulfurization but it has not been tested on a large scale. Processes based on ‘indirect’ bioleaching of pyrite from coal may also have applications. Other forms of sulfur in coal, such as elemental sulfur, are usually quantitatively insignificant, but nonetheless can be removed microbiologically. Thermophilic bacteria remove pyritic sulfur from coal at faster rates than mesophilic bacteria, in part due to faster abiotic rates of pyrite oxidation at elevated temperatures. Future work in biological desulfurization of coal should include studies on treatment of waste coal or refuse material. 相似文献