脱硫废水旋转喷雾蒸发产物特性及其对粉煤灰资源化利用的影响  

Study on the Characteristics of Evaporation Product from Desulfurization Wastewater by Rotary Spray and Its Influence on the Resource Utilization of Fly Ash

作　　者：孙宗康 郑锁祺 詹凌霄 杨林军[2] SUN Zongkang;ZHENG Suoqi;ZHAN Lingxiao;YANG Linjun(Guangdong Electric Power Development Co.,Ltd.,Guangzhou 510000,Guangdong Province,China;Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing 210096,Jiangsu Province,China)

机构地区：[1]广东电力发展股份有限公司,广东广州510000 [2]东南大学能源热转换与控制教育部重点实验室,江苏南京210096

出　　处：《动力工程学报》2025年第4期612-618,共7页Journal of Chinese Society of Power Engineering

摘　　要：在脱硫废水旋转喷雾干燥中试平台上开展了喷雾蒸发试验,对喷雾干燥产物颗粒特性的形貌、组分以及流动性等进行了表征,并探讨了脱硫废水旋转喷雾蒸发对电除尘器运行和粉煤灰资源化利用的影响。结果表明:废水蒸发析出盐分多为大片状结构,部分粉煤灰颗粒通过晶桥连接,出现明显团聚;干燥产物晶型包括MgSO_(4)、CaSO_(4)·0.5H_(2)O、SiO_(2)和NaCl等;废水喷雾蒸发对飞灰颗粒有一定团聚作用,有利于提升电除尘器对细颗粒物的捕集效率;塔底蒸发产物流动性整体介于可出流粉体和具有内聚力粉体之间,随着塔底蒸发产物含水率升高,流动性变差;实验工况下,脱硫废水中约90%的氯元素进入蒸发产物并进入主烟道,主烟道飞灰氯含量略有上升,但仍能满足粉煤灰资源化利用相关的国家和行业标准。Spray evaporation experiments were carried out on the pilot rotary spray drying platform for desulfurization wastewater.The morphology,composition and flowability of the spray-dried products were characterized.The effects of desulfurization wastewater rotary spray evaporation on the operation of the electrostatic precipitator(ESP)and the resource utilization of fly ash were also discussed.Results show that the salt precipitated from wastewater evaporation forms mostly large flaky structure.Some fly ash particles appear obvious agglomeration through the crystal bridge connection.The drying products mainly contain crystalline salts including MgSO_(4),CaSO_(4)·0.5H_(2)O,SiO_(2) and NaCl,etc.The wastewater spray evaporation has a certain agglomeration effect on the fly ash particles,which is conducive to improving the ESP's capture efficiency of fine particles.The flowability of the evaporated products at the bottom of the tower is intermediate between the flowable powder and the cohesive powder.With the increase of the water content in the evaporated products,the flowability of drying products deteriorates.In the experimental conditions,about 90% of the chlorine in the desulfurization wastewater is transferred into the evaporated products and enters into the main flue.The mass concentration of the chlorine in the main flue fly ash increases slightly,but it can still meet the national and industrial standards related to the resource utilization of fly ash.

关 键 词：脱硫废水 旋转喷雾 干燥 飞灰 资源化利用 

分 类 号：X703[环境科学与工程—环境工程]