煤燃烧过程中有害痕量元素形态分布的化学热力学平衡分析  

Thermodynamic equilibrium analysis of trace elements mobilization during combustion of coals

作　　者：孟韵[1] 张军营[2] 钟秦[3] 

机构地区：[1]青岛大学师范学院化学系,山东青岛266071 [2]华中科技大学煤燃烧国家重点实验室,湖北武汉430074 [3]南京理工大学化工学院,江苏南京210094

出　　处：《燃料化学学报》2005年第1期28-32,共5页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(40272071);国家重点基础研究发展规划项目(2002CB211602)。~~

摘　　要：采用化学热力学平衡分析方法,应用真实煤质数据预测了煤燃烧过程中国内六种具有代表性的煤种有害易挥发性痕量元素As和Se的化学形态分布。计算中考虑了痕量元素和卤素(如氯元素)的相互作用,也考虑了痕量元素与主量矿物元素之间的相互作用。研究结果表明,不同煤级、不同产地的煤中痕量元素As的化学形态分布有较大差异。As的热力学平衡计算中,数据库中是否忽略AsO形态对结果影响非常显著,忽略AsO形态的限制性模拟结果似乎更能反映真实煤燃烧过程中As的化学形态分布。煤级和煤的产地对Se的化学形态分布没有显著影响。The thermodynamic equilibrium calculations were performed to reveal the distributions of the trace elements (arsenic and selenium) during combustion of six Chinese coals. Actual coal compositions and combustion conditions were utilized in all simulations. The interaction between trace element and halogen and that between trace element and major minerals were considered during calculation. The rank and source of coals have significant effect on the distributions of arsenic. Arsenic mobility has varied dramatically when AsO(g) is ignored from the database. The constrained simulation results appear to more actually reflect the distribution of arsenic during coal combustion. The predicted modes of occurrence of selenium for the six coals are nearly identical.

关 键 词：煤 燃烧 痕量元素 热力学平衡分析 

分 类 号：O642.4[理学—物理化学]