硫酸氢铵对灰垢板结与疏松的影响研究  

Experimental study on the hardening and loosening of ammonium bisulfate ash scale

作　　者：赵雪成 何川[1] 马云龙 卜俊峰 孔凡海[1] 许波连[2] 宋玉宝[1] ZHAO Xuecheng;HE Chuan;MA Yunlong;BU Junfeng;KONG Fanhai;XU Bolian;SONG Yubao(Suzhou Brarch,Xi’an Thermal Power Research Institute Co.,Ltd.,Suzhou 215153,China;School of Chemistry and Chemical Engineering,Najing University,Nanjing 210093,China)

机构地区：[1]西安热工研究院有限公司苏州分公司,江苏苏州215153 [2]南京大学化学化工学院,江苏南京210093

出　　处：《热力发电》2023年第11期159-164,共6页Thermal Power Generation

基　　金：苏州市重点产业技术创新项目(SGC2021121)。

摘　　要：燃煤机组选择性催化还原(SCR)烟气脱硝系统运行过程中,烟气中的硫酸氢铵(ABS)易造成空气预热器(空预器)冷端灰垢板结,增加了吹扫清灰难度。为此,实验制备ABS预混灰样压片并在不同温度下加热,设计新型检测方法比较样品抗压强度的变化,探索ABS对灰垢机械强度的影响规律。结果显示:1)ABS预混灰样在147~220℃加热板结过程中发生了物理团聚和化学反应,抗压强度最大提高了约95.50%,其中物理团聚起主导作用,影响程度约占88%~89%,化学反应的影响约占10%~12%;2)ABS板结灰样在220~300℃加热下,气化析出率最高达到96.43%,灰样由板结状态转为疏松,抗压强度由空白样品的195.50%降低到110.17%。证明通过高温加热降低堵塞物中ABS含量是可行的,为改进吹扫清灰创造了条件。During the operation of SCR flue gas denitrification system in coal-fired units,ammonium bisulfate(ABS)in flue gas causes ash scale slabbing at the cold end of the air preheater and increases the difficulty of purging and cleaning ash.To this end,ABS premixed ash samples were prepared and pressed and heated at different temperatures,and a new test method was designed to compare the changes in compressive strength of the samples and explore the influence law of ABS on the mechanical strength of ash scale.The experimental results showed that:1)ABS premixed ash samples underwent physical agglomeration and chemical reaction during the heating of slabbing at 147-220℃,and the compressive strength was increased by about 95.50%at maximum,among which physical agglomeration played a dominant role with about 88%-89%influence and the influence of chemical reaction accounted for about 10%-12%;2)ABS slabbed ash samples under heating at 220-300℃,ABS vaporization precipitation rate reached up to 96.43%,the ash sample from the slab state to loose,compressive strength from 195.50%of the blank sample to 110.17%.It is proved that the means of high temperature heating is feasible to reduce the ABS content in the blockage and create conditions for improving blowing and cleaning from the perspective of ash scale.

关 键 词：空预器堵塞 硫酸氢铵 抗压强度 物理团聚 加热气化 

分 类 号：X773[环境科学与工程—环境工程]