转炉生产过程中产生的大量烟气具有很高温度且带有大量粉尘颗粒,转炉烟气降温除尘并回收高温烟气中的余热是转炉工序环保、低碳和降本增效的关键.综述了转炉烟气的处理手段,指出了传统余热回收及除尘方法存在的缺陷,分析了新的余热回收方法,设想出3条转炉烟气及产物处理应用的技术路线.目前对中低温度段的转炉烟气余热收集能力较差,传统的OG(Oxygen Converter Gas Recovery)法和LT(Lurgi-Thyssen)法存在煤气回收品质低、热量损失大、除尘效果差等缺点,已无法满足对中低温度段转炉烟气余热回收的技术需求,带有汽化冷却管道喷煤的全干法余热回收法和化学熔盐储能法等为转炉烟气的余热回收提供了新的技术途径.基于现有烟气处理流程,提出以烟气低温余热回收、转炉煤气与蒸汽多元化利用及智能化冶炼为核心的技术路线,旨在高效利用转炉二次能源并减少能源消耗.
Current status and prospects of waste heat recovery of converter flue
A large amount of flue gas will be produced in the production process of the converter,and the flue gas has a high temperature and a large number of dust particles.Therefore,the cooling and dust removal of the converter flue gas and the recovery of the waste heat in the high temperature flue gas of the converter are the key to environmental protection,low carbon and cost reduction and efficiency of the converter process.The treatment methods of converter flue gas were summarized.It also points out the defects of the traditional waste heat recovery and dust removal methods,introduces and analyzes the new waste heat recovery method,and proposes three technical routes of converter flue gas and product treatment application.Currently,the capability of collecting waste heat from medium and low-temperature converter flue gas is limited.Traditional OG method and LT method have problems with gas recovery quality,heat loss and poor dust removal effect and have been unable to meet the technical requirements of low-temperature converter flue gas waste heat recovery.Vaporization cooling pipeline coal injection dry waste heat recovery method and chemical molten salt energy storage method for low-temperature converter flue gas waste heat recovery provide a new technical way.According to the existing flue gas treatment process,the technical route with the low-temperature waste heat recovery of flue gas,the diversified utilization of converter gas and steam and the intelligent smelting as the core in the future was put forward,so as to make the efficient use of energy and reduce the energy consumption.
万方数据
维普
