...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fuel >Oxidation of the sulphurised dolomite produced in the desulphurisation of the gasification gases
【24h】

Oxidation of the sulphurised dolomite produced in the desulphurisation of the gasification gases

机译：气化气脱硫过程中产生的硫化白云石的氧化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Dolomite reacts with H_2S to produce calcium sulphide and has been broadly investigated as a desulphurisation agent due to its low-cost and favourable properties.rnBecause CaS reacts with water or water vapour in the environment to regenerate hydrogen sulphide and, therefore, disposal is problematic and the chemical cannot be uses as a landfill material. One of the methods used to make this material inert is oxidation to convert calcium sulphide into calcium sulphate or calcium oxide.rnIn our study, tests were carried out using dolomite from Granada, Spain, that was previously calcined and sulphurised at high temperature with a gas similar to that produced in gasification facilities. To approximate real-scale results, a relatively large amount of substance was used for each sample (100-150 g) and the samples were used in a fixed-bed position.rnThe influence of different conditions, such as grain size, composition of the oxidation gas, gas velocity, bed length and temperature, was them investigated. The final solid products were characterised by X-ray diffraction and chemical analysis and the CO_2, SO_2, H_2S and COS concentrations in the gases produced during oxidation were analysed by gas chromatography.rnThe results showed that the most influential factor was grain size and that the best oxidant was O_2 mixed with nitrogen.rnThe presence of water vapour increases the residual concentration of CaS in the end product, but increased the CaO contentrnThe higher the oxygen concentration and the higher the gas velocity, the lower the residual content of CaS. CO_2 used alone oxidises CaS to produce SO_2 and COS, but at very low rates. It also produces some CS_2. Water vapour used alone can also oxidise the CaS to produce H_2S and SO_2 but also at very low velocity.rnAt higher oxidation temperature, between 700℃ and 850 ℃, lesser residual CaS is obtained in the oxidised product.
机译：白云石与H_2S反应生成硫化钙，由于其低成本和良好的性能而被广泛地用作脱硫剂.rn由于CaS与环境中的水或水蒸气反应可再生硫化氢，因此处置存在问题且该化学物质不能用作垃圾掩埋材料。使该材料呈惰性的方法之一是氧化，将硫化钙转化为硫酸钙或氧化钙。在我们的研究中，测试使用的是西班牙格拉纳达的白云石，该白云石先前已在高温下通过气体煅烧和硫化与气化设施产生的相似。为了近似真实的结果，每个样品使用相对大量的物质（100-150 g），并且样品在固定床位置使用。rn不同条件（例如晶粒尺寸，合金成分）的影响。研究了氧化气体，气体速度，床长和温度。通过X射线衍射和化学分析对最终固体产物进行表征，并通过气相色谱法分析氧化过程中产生的气体中CO_2，SO_2，H_2S和COS的浓度。结果表明，影响最大的因素是晶粒大小，并且最好的氧化剂是O_2与氮混合。rn水蒸气的存在增加了终产物中CaS的残留浓度，但增加了CaO含量。氧浓度越高和气体流速越高，CaS的残留含量越低。单独使用的CO_2氧化CaS产生SO_2和COS，但速率非常低。它还会产生一些CS_2。单独使用的水蒸气也可以氧化CaS生成H_2S和SO_2，但速度很慢。在700℃至850℃的较高氧化温度下，氧化产物中残留的CaS较少。

著录项

  • 来源
    《Fuel》 |2009年第12期|2507-2519|共13页
  • 作者

    Ramon Alvarez-Rodriguez; Carmen Clemente-Jul;

  • 作者单位

    Mining School, Technical University of Madrid (UPM), Rios Rosas Street 21. 28003 Madrid. Spain;

    Mining School, Technical University of Madrid (UPM), Rios Rosas Street 21. 28003 Madrid. Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    calcium sulphide oxidation; gasification; dolomite; coal;

    机译：硫化钙氧化;气化;白云石;煤;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号