大气污染治理技术
徐东耀,钱路新,赵爱华,贾宏艺,王伟成.煤粉固硫燃烧的动力学研究[J].环境科学学报,2005,25(8):1004-1010
煤粉固硫燃烧的动力学研究
- Study on the kinetic parameters during burning sulfur-fixing pulverized coal
- 基金项目：国家2000年技术创新重点项目(No.1201)
- 作者
- 单位
- 徐东耀
- 中国矿业大学化学与环境工程学院, 北京 100083
- 钱路新
- 中国矿业大学化学与环境工程学院, 北京 100083
- 赵爱华
- 中国矿业大学化学与环境工程学院, 北京 100083
- 贾宏艺
- 中国矿业大学化学与环境工程学院, 北京 100083
- 王伟成
- 中国矿业大学化学与环境工程学院, 北京 100083
- 摘要：采用新汶、阳泉原煤作为实验用煤,选择Ca(OH)2作为主固硫剂,考察了CaS的变化对燃煤固硫燃烧特性以及动力学参数的影响.采用碳酸盐、氯化物和氢氧化物3大系列化学试剂作为添加剂,在CaS为1.5的条件下,考察了它们对Ca(OH)2固硫能力的影响,以及固硫煤粉的燃烧特性和动力学参数的变化.实验表明:1)碳酸钾添加剂的助固硫作用明显,将固硫率提高了14%左右;2)固硫剂Ca(OH)2的加入使Arrhenius曲线斜率增大,明显提高了燃烧反应的活化能;3)随着CaS的增加,原煤的着火点和结束点、活化能有逐渐增大的趋势;4)添加剂对原煤燃烧特性的影响并不显著,但对活化能的影响却十分明显,添加剂的加入有效地降低了燃烧反应的活化能.
- Abstract：Two kinds of coal from Xinwen and Yangquan were separately used in the experiment, and Ca(OH)2 was selected as the main sulfur-fixing agent. The effect of ratio of Ca/Son the combustion characteristic and kinetic parameters was studied. The influence of three kinds of additives (carbonate, chloride and hydroxide) on the sulfur-fixing capability of Ca(OH)2, combustion characteristics of sulfur-fixing pulverized coal and kinetic parameters were separately compared under the experiment temperature of 1000℃ and Ca/S=1.5. As a result:1) Potassium carbonate was better as additive than chloride or hydroxide. When potassium carbonate was used as additive, the sulfur-fixing capability of Ca(OH)2 was promoted and the sulfur-fixing efficiency increased by 14%. 2) The slope of Arrhenius curve was increased by adding Ca(OH)2 sulfur-fixing agent, the activation energy of the combustion reaction was obviously promoted. 3)Along with the increasing of the ratio of Ca/S, the inflammation point and combustion ending point trended toward gradually increasing, and the activation energy of reaction trended toward gradually increasing, too. 4) The influence of additive on the combustion performance of coal was not obvious, but the influence of additive on the activation energy was obvious, and the activation energy of reaction was decreased by adding additives.
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