焦化行业蒸氨工艺的优化与改造

Optimization of ammonia distillation technical process in coking

针对现有蒸氨工艺存在的处理量小、设备易于堵塞、去生化工段的废水温度高、顶部气相含氨量低等问题,利用化工流程模拟软件对焦化企业中的蒸氨工艺进行了优化和设计。模拟结果表明:进水量为100 t/h、塔顶气相含氨量在40%时,最适宜蒸汽量为11 t/h,适宜回流比为2.25;并对原有系统进行改造,新增加了蒸氨塔、剩余氨水槽、低温水冷却器,并采用新型筛板塔盘,改造后蒸氨系统处理量为100 t/h,废水氨质量浓度均在50 mg/L以下,塔顶气相含氨量在40%以上,进入生化系统的蒸氨废水温度均在25～35℃。

There were lots of problems in ammonia distillation process, the handing capacity were small, the equipments were easy to jam,the temperature of wastewater for biochemical treatment system was high, gas phase ammonia content were low. Optimize the ammonia distillation in coking enterprise using chemical process simulation software. The results show that, when the sewage flow are 100 t/h, and the gas phase ammonia content are 40 percent,the most suitable steam consumption are 11 t/h and the reflux ratio is 2.25. Add ammonia still, surplus ammonia water trough, low temperature water cooler and new type sieve tray. After transformation, the handling capacity of ammonia distillation system is 100 t/h, waste ammonia water concentration is less than 50 mg/L, the gas phase ammonia content is more than 40 percent, the temperature of wastewater for biochemical treatment system ranges from 25 ℃ to 35℃.