摘要
硫酸盐极易导致锅炉尾部受热面积灰硬化形成高强度垢,影响设备的安全性和经济性。为了阐明垢的机理,对硫酸钙和硫酸氢铵进行了结垢实验,并对垢样品进行了抗压强度和XRD分析,通过热力学平衡计算确定哪些胶凝物质会成垢。结果表明,硫酸钙和硫酸氢铵作用下飞灰垢样的抗压强度均有不同程度的提高,且抗压强度随硫酸盐质量分数的增加而增强。实验和热力学平衡计算表明,硫酸钙与积灰反应生成石膏类胶凝材料;硫酸氢铵作用下,飞灰反应生成石膏类胶凝物质以及大量硫酸氨和少量钾明矾,具有更强结垢倾向。
Sulfate can easily lead to ash hardening of the heating area at the tail of the boiler to form high-strength scale,which affects the safety and economy of the equipment.In order to clarify the mechanism of scaling,the scaling experiments of calcium sulfate and ammonium bisulfate were carried out,and the compressive strength and X-ray diffraction composition analysis of the scale samples were carried out.The thermodynamic equilibrium calculation was used to determine which gelled substances would scale.The results showed that the compressive strength of fly ash scale samples under the action of calcium sulfate and ammonium bisulfate increased to varying degrees,and the compressive strength increased with the increase of sulfate content.Experiments and thermodynamic equilibrium calculations show that calcium sulfate reacts with ash to form gypsum sulfate cementitious materials;under the action of ammonium bisulfate,fly ash reacts to form gypsum cementitious material,a large amount of ammonia sulfate and a small amount of potassium alum,which has a stronger scaling tendency.
作者
刘志杰
周培焱
LIU Zhijie;ZHOU Peiyan(China Energy Yongzhou Power Generation Co.,Ltd.,Yongzhou 425000,China;North China Electric Power University,Beijing 102206,China)
出处
《洁净煤技术》
CAS
CSCD
北大核心
2024年第S02期372-376,共5页
Clean Coal Technology
关键词
低温受热面
积灰
结垢
low temperature heating surface
ash accumulation
scaling
作者简介
刘志杰(1970—),男,辽宁绥中人,工程硕士,高级工程师
