摘要
研究了电站 1 025t/h煤粉炉燃用Ca/S(摩尔比) =2. 02的神木煤自身固硫灰渣的晶相组成,XRD分析表明,入炉煤中无定形的非晶相质量分数高达 91. 2%,CaCO3 晶相质量分数为 2. 1%。满负荷下飞灰中因高温熔融形成的玻璃态非晶相质量分数高达 70. 5%,煤灰自身固硫产物CaSO4 质量分数为 3. 4%,CaCO3 和CaO质量分数为6. 9%,使其仍具有进一步固硫的能力。满负荷下炉底渣中钠长石质量分数高达 59. 2%,非晶相质量分数为25. 7%,未发现CaSO4、CaCO3 或CaO晶相。当锅炉负荷降低时,飞灰中非晶相质量分数相应降低,炉底渣中非晶相质量分数升高。
The crystal compositions of self-desulfurization residues produced in a 1025 t/h pulverized coal fired boiler using Shenmu coal were studied, which had the self-desulfurization efficiencies of 27%-33% at the full steam load. It is found by XRD analysis that the amorphous phase content is 91.2% and the CaCO3 content is 2.1% in the feed coal. In the fly ash derived from coal combustion at the full steam load, the vitreous phase content is 70.5% and the sulfation product CaSO4 content is 3.4%, while the CaCO3 and CaO contents are 4.7% and 2.2%, respectively. In the bottom ash, the albite content is 59.2% and the vitreous phase content is 25.7%, but none of CaSO4, CaCO3 and CaO phase is detected. With a decreaseof steam load of the boiler, the vitreous phase content in fly ash decreases but that in bottom ash increases.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2005年第1期38-42,共5页
Journal of Fuel Chemistry and Technology
基金
国家重点基础研究发展规划项目(G1999022204)
国家高技术研究发展计划项目(863项目
2002AA529122)。~~
关键词
煤粉炉
灰渣
固硫
燃烧
晶相组成
pulverized coal fired boiler
coal ash
desulfurization
combustion
crystal compositions
