烧结环冷机余热高效利用生产实践

Efficient utilization production practice of waste heat of sintering ring cooler

为实现钢厂节能减碳的双碳目标,采用阶梯式自密封余热回收技术对涟源钢铁集团有限公司280烧结环冷机余热发电系统进行技术改造。结果表明,改造后的烧结环冷机余热利用效率明显提高,吨矿日均发电量和余热电站最高出力突破历史新高。采用CFD计算流体力学软件Fluent 6.3采用对改造前后的烟罩内的气体流场、温度场、压力分布和烟气流量分布等进行模拟。结果表明,改造后余热回收烟罩内的烟气流场冷风渗入区域明显减小、温度分布更均匀且温降梯度更好、压力分布较改造前更均匀。对烟罩改造前后烟罩内温度和中压蒸汽量进行实际测量的结果表明,改造后烟罩内的平均温度和平均中压蒸汽产量更高,烟罩内烟气的压力分布更均匀。采用阶梯式自密封余热回收技术对烧结环冷机余热回收系统进行技术改造可提高系统余热回收效率,增加余热电站的发电量,有利于钢厂双碳目标的达成。

In order to achieve the double carbon goal of energy saving and carbon reduction in steel plant, the ladder self sealing waste heat recovery technology was used to transform the waste heat power generation system of 280 sintering ring cooler in Lianyuan Iron and Steel Group Co.,Ltd.The results show that the waste heat utilization efficiency of the reformed sintering ring cooler is significantly improved, and the daily average power generation per ton of ore and the maximum output of the waste heat power station have broken through a record high.CFD computational fluid dynamics software Fluent 6.3 is used to simulate the gas flow field, temperature field, pressure distribution and flue gas flow distribution in the hood before and after the transformation.The results show that after the transformation, the cold air infiltration area of the flue gas flow field in the waste heat recovery hood is significantly reduced, the temperature distribution is more uniform, the temperature drop gradient is better, and the pressure distribution is more uniform than before the transformation.The actual measurement results of the temperature and medium pressure steam in the hood before and after the transformation show that the average temperature and average medium pressure steam output in the hood after the transformation are higher, and the pressure distribution of the flue gas in the hood is more uniform.The technical transformation of the waste heat recovery system of the sintering ring cooler by using the ladder self sealing waste heat recovery technology can improve the waste heat recovery efficiency of the system and increase the power generation of the waste heat power station, which is conducive to the achievement of the double carbon goal of the steel plant.