天然气纯氧自热转化制甲醇节气增产减排CO_2工艺的实践

Practices of Using NG and Pure Oxygen ATR Method to Produce Methanol

内蒙古苏里格甲醇厂一套天然气制甲醇合成气的装置原采用一段外热蒸汽转化工艺,甲醇生产能力为18×10~4t/a。与外加热蒸汽转化工艺相比,轻烃自热转化大约用1m^3O_2可替代0.5m^3CH_4,采用天然气纯氧自热转化制甲醇合成气的两段转化工艺(增设二段炉)进行改造,可增加甲醇生产能力15×10~4t/a,配套改造投产后甲醇生产能力可达到33×10~4t/a,改造后生产甲醇的天然气消耗量由1100m^3/t(标准)下降为960m^3/t(标准)。所用自热转化工艺采用多气流转化炉与低温混合喷射外燃式烧嘴配套的创新技术,该技术的成功应用,达到了节气12.7%、增产83.3%的目的。采用该新工艺生产甲醇合成气可节省原料天然气20%～30%,减排CO_2 70%～95%。

A natural gas-methanol syngas unit in the Sulige Methanol Plant in Inner Mongolia originally used external hot steam reforming technology and had a methanol production capacity of 18×10^4t/a.Compared with external steam heating reforming technology,the light hydrocarbon automatic thermal reforming （ATR） method uses around 1m^3 of O2 to replace 0.5m^3 of CH4.If a two-stage NG and pure oxygen ATR method （introducing a two-stage furnace） is used,the methanol production capacity of the unit could rise by 15×10^4t/ a.If all associated facilities are upgraded,the unit＇s methanol production capacity could reach 33×10^4t/a.After the upgrades,the natural gas consumption of the unit would drop to 960m^3 per ton of methanol from 1100m^3. This ATR technology uses an innovative combination of a multi-airflow reformer and a low-temperature blending jetting,external combustion burner.As a result of the application of this tec.hnology,the Sulige unit＇s natural gas consumption dropped by 12.7% and methanol output increased by 83.3%.Using this innovative technology to produce methanol syngas could save up to 20%-30% of feedstock natural gas and reduce CO2 emissions by 70%-95%.