粉煤灰制备高耗氯产品主反应装置能质平衡模型

Energy mass balance model of main reaction device for preparing high chlorine consumption products from fly ash

探索开发新的粉煤灰有价组元高附加值提取工艺对提高大宗固废粉煤灰的资源利用效率具有现实意义。首先,基于氯化冶金原理提出采用喷吹竖炉工艺结合精馏提纯技术,以粉煤灰与工业副产氯气为主要原料制备高耗氯产品的技术解决方案,兼顾“以废治废”。然后,构建了喷吹竖炉工艺主反应装置的能质平衡模型,通过数值计算分析了经济技术指标,评估了工艺的可行性。计算结果表明,每小时处理695 kg粉煤灰可以生产具有高附加值AlCl_(3)、FeCl_(3)及SiCl_(4)的理论产量分别为498.78、94.86、935.55 kg,同时消耗焦炭280.47 kg、工业副产氯气1 593.74 kg、载气空气182.07 kg;提高工业副产氯气的预热温度可以减少焦炭消耗量,优化生产成本;炉气带走热量占主反应装置热量支出的74.78%,与粉煤灰中各氧化物的氯化率呈正相关;精馏提纯后的高热值炉气结合烟气炉等余热回收设备可以实现循环利用。研究内容和结果可为后续工艺仿真模拟和优化操作参数提供理论基础和数据支撑。

Exploring and developing a new extraction process of valuable components of fly ash with high added value is of practical significance to improve the resource utilization efficiency of bulk solid waste fly ash.Based on the principle of chlorination metallurgy,this paper first proposes a technical solution to prepare high chlorine consumption products with fly ash and industrial by-product chlorine as the main raw materials by using the injection shaft furnace process combined with distillation purification technology,giving consideration to“Treating the wastes with wastes”.Then the energy and mass balance model of the main reaction device of the injection furnace process is constructed,and the economic and technical indicators are analyzed through numerical calculation,and the feasibility of the process is evaluated.The calculation results show that the theoretical output of AlCl_(3),FeCl_(3) and SiCl_(4) with high added value can be 498.78,94.86 and 935.55 kg respectively by treating 695 kg fly ash per hour,at the same time,280.47 kg coke,1593.74 kg industrial by-product chlorine and 182.07 kg carrier air are consumed.Increasing the preheating temperature of industrial by-product chlorine can reduce coke consumption and optimize production costs.The heat taken away by the furnace gas accounts for 74.78% of the heat expenditure of the main reactor,which is positively related to the chlorination rate of the oxides in the fly ash.The high calorific value furnace gas after rectification purification can be recycled together with waste heat recovery equipment such as flue gas furnace.The research contents and results can provide theoretical basis and data support for subsequent process simulation and optimization of operating parameters.