【作者】 孟捷；

【导师】 张承中；

【作者基本信息】 西安建筑科技大学 ， 环境工程， 2005， 硕士

【摘要】 本文研究了以生石灰、电厂废料粉煤灰、烧结机头除尘灰等原料通过物理混合及活化手段制备适用于循环流化床装置的新型脱硫剂,在鞍钢一台处理能力为5000m³/h的循环流化床工业性试验装置上进行了烧结烟气脱硫性能试验。充分利用钢铁企业现有碱性原料和碱性废物,研究开发适合烧结机烟气循环流化床脱硫的新型脱硫剂,达到以废治废、降低运行成本和提高脱硫剂利用率的目的,同时为我国循环流化床烧结烟气脱硫的发展提供支持。 本研究在烧结烟气SO₂浓度143～1278mg/Nm³,烟气量4300～4900m³/h,烟气温度在80～200℃,设计气速3m/s的条件下,对三种组成的脱硫剂进行了脱硫剂对比试验、脱硫剂粒径选择试验及喷雾增湿试验的研究。试验结果表明:三种脱硫剂均能脱硫,尤其脱硫剂C的脱硫性能较好,脱硫剂钙的利用率较高,并具有相对较好的经济性。通过对脱硫前后脱硫剂粒径变化的分析,得出在进行快速流化作业的粒子粒径范围选择时,生石灰粒径dp<350μm（ρ_p=2615kg/m³）、机头灰dp<260μm（ρ_p=4617kg/m³）和粉煤灰dp<400μm（ρ_p=2185kg/m³）的粒子适宜快速流化作业,同时提出了简易确定流化粒子粒径的计算方法,并经检验,符合实际运行情况。在增湿实验中发现循环流化床烟气脱硫反应十分复杂,化学吸收和吸附并存。当烟气温度>100℃时,脱硫反应区液态水的存在,是维持本工艺脱硫高效率的关键,同时脱硫效率随烟气出口温度与烟气露点温度之差的降低而升高,当两者差值在10～20℃,脱硫效率增加很快。增湿量在4.4～5L/1000Nm³之间,烟气出口温度可控制在70～90℃范围内,脱硫效率可达80%以上,且脱硫效率随钙硫比的增加而增加,当钙硫比大于1.4以后,脱硫效率增加变缓。当△t=10℃,喷淋密度在0.24～0.036 L/kg·m²,钙硫比为1.3～1.5之间时,脱硫剂B、C、D在本套装置中运行,均能达到80%的脱硫效率,且钙的利用率可达45%以上。更多还原

【Abstract】 This paper selects calces ,coke breeze and sinter ash as material which were mixed and experienced activation, in the end, getting a new desulfurizing agents on 5000m³/h CFBA. Desulfurizing agents is calces,and addition agents is coke breeze and sinter ash. The aim of this study is to make the best used of the alkalescent raw material and alkalescent waste material of the steel corporation. So it help to find a new kind of the desulfurization reagent which can be used in the ore sintering flue gas desulfiirization in circulating fluidized bed absorber and reduce the run cost, increase the desulfurization reagent using ratio. The result of the study may give the support to the ore sintering flue gas desulfurization.The research was done under the condition of 143-1278 mg/Nm³ SO₂ inlet concentration, 4300-4900 m3/h, 3m/s gas speed and 80-200 °C ore sintering flue gas. The research included desulfurization reagent contrastive test, particle diameter selecting test and spraying humidifier test to the three kinds of desulfurization reagent. The results of tests indicated that the desulfurization reagent C had better desulfurization capability, higher Ca using ratio and better economy of material in the three kinds of desulfurization reagent. The contrastive analysis was done to the changing particle diameter in the before and after desulfurization. When selecting particle diameter range of speediness fluidized exercise, the diameter of calces ,coke breeze and sinter ash respectively lower dp<350μm（ p p =2615kg/m3）,dp<400μm（ P p =2185kg/m3） and dp<260μm （ P p =4617kg/m3 ） are fit for the state. At the same time, the assessment of particle diameter can calculate through ultimate sedimentation speed of particle if lacking basic lab data of particle. In the humidifier test, the chemistry imbibing and absorption existed contemporary. When the gas temperature exceed 100℃,the liquid state water ofdesulfurization reaction area was the key to keep higher efficiency of desulfurization. And desulfurization efficiency would hoist along with falling of difference of the gas exit temperature ang the gas dew point temperature. When the difference was 10-20℃, the desulfurization efficiency increased fleetly. When humidifier amount was 4.4-5 L/1000Nm³ and the gas exit temperature was 70-90 ℃, the desulfurization efficiency can reach 80% upwards and it will increase during increasing of Ca/S. When Ca/S is 1.4 upwards, it will increase slowly. When 10 ℃ of At, 0.024-0.036 L/kg·m² of cascading density and 1.3-1.5 of Ca/S, the desulfurization reagent B、 C、 D can reach desulfurization efficiency 80% and Ca using ratio can reach 45% upwards in the equipment.更多还原