贝壳粉型煤固硫剂固硫的实验及机理研究
Experiment and mechanism study on shell powder as coal briquette desufurzier
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摘要: 以贝壳粉作为型煤固硫剂，用正交实验的方法研究了影响贝壳粉固硫率的主要影响因素，在高温（1 150℃）时固硫效率达到56.6%，比CaCO3的固硫率提高40%以上，具有较好的高温固硫性。分析得知，贝壳的主要成分为CaCO3，其含钙量在40%左右，贝壳中又含有较高的Na等碱金属元素以及Fe，Al和Si等。用X射线粉末衍射法分析了高温（1 150℃）型煤样生成的灰渣，分析了贝壳粉作为型煤固硫剂在高温下具有较高固硫率的机理。发现CaAlSi2O8为主的复合晶体在高温下包裹在CaSO4的表面，抑制了CaSO4的热分解从而有效地提高了固硫率。Abstract: Shell powder was used as coal briquette desufurzier. Orthogonal testing method was used to study the main factors which have influences on the desulphurization rate. Its desulphurization rate is 56.6% at 1 150℃，and it is good at high temperatures. The main component of shell powder is CaCO3， and it contains about 40% calcium. It also has high alkali metal such as Na and K， and other elements of iron， aluminum and silicon. The cinder which generated at 1 150℃ by coal was studied by XRD， and the mechanism that the shell powder as coal briquette desufurzier has high desulphurization rate at high temperatures was discussed. CaAlSi2O8 which is composite crystal in cinder is found， and CaSO4 is covered by it at high temperatures， then the decomposition of CaSO4 is suppressed and the desulphurization ration is improved effectively.
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Key words:
- coal briquette /
- shell powder /
- sulfur fixation /
- XRD
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