期刊文献+

类蒸汽汽提法预处理变换单元高氨氮酸性冷凝液 被引量:1

Pretreatment of High Ammonia-Nitrogen Acid Condensate from Conversion Unit by Steam Stripping
下载PDF
导出
摘要 某粉煤气化装置的变换单元采用低水汽比工艺,其工艺冷凝液经汽提塔汽提后再经汽提塔分离器分离,高浓度氨氮废水与系统内甲醇废水汇合送往废水处理装置。由于该股废水中氨氮化物、硫化物及COD均超高,对生化废水的处理工艺造成冲击,导致总排出口的总氮含量超标排放。因此将煤气化变换单元循环水换热器更换为脱盐水换热器、分离塔入口汽提液温度调高到105℃以上,对酸性冷凝液废水在分离塔使用类蒸汽汽提法进行预处理,使其液相中的氨氮物质尽量气化分离。结果表明:预处理后气相中的高氨氮物质、有机物及含硫化合物总量增加,以大于1 282.2 kg/h较大总量引到火炬系统处理,冷凝液中氨氮含量降低,以小于44.8 kg/h较低的总量进入生化单元,保证外排废水经生化处理后达标排放。 The wastewater fed into treatment unit needs pretreating for effective water treatment. The high concentration ammonia-nitrogen wastewater from a coal gasification conversion unit, after joining the methanol wastewater, is sent to the wastewater treatment unit, but the ultrahigh high contents of ammonia-nitrogen compounds, sulfur compounds and COD in the wastewater stream make serious impact on biochemical treatment process, leading to excessive total nitrogen discharge at master outlet. Therefore, the circulating-water heat exchanger in the coal gasification conversion unit has been replaced with desalted-water heat exchanger, the stripping liquid temperature at separation tower entrance raised to above 105~C, and the acid condensate waste pretreated by steam stripping in separation tower, so as to gasify and separate ammonia-nitrogen compounds in liquid phase as much as possible. The results show that, after the pretreatment, the total volume of high ammonia-nitrogen compounds, organics and sulfur compounds in gas phase has increased, which is sent into gas flare at a rate of more than 1,282.2 kg/h. Thus, the total ammonia-nitrogen content in the acid condensate has reduced, which is sent into biochemical process unit at a rate of less than 44.8 kg/h, ensuring the wastewater discharge after biochemical treatment up to standard.
出处 《石油石化绿色低碳》 2018年第1期36-39,共4页 Green Petroleum & Petrochemicals
关键词 煤气化 类蒸汽汽提法 变换单元 酸性冷凝液 高浓度氨氮废水 预处理 coal gasification: steam stripping: conversion unit: acid condensate: high concentrationammonia-nitrogen wastewater pretreatment
  • 相关文献

参考文献2

二级参考文献12

共引文献17

同被引文献13

引证文献1

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部