合成氨转化工序水碳比指标控制的探讨

Disccusion on the Water-carbon Ratio Control in the Synthesis Ammonia Transformation Process

小合成氨厂天然气连续催化转化工艺中天然气转化需要蒸汽,较高的水碳比不仅可以降低转化炉出口残余甲烷含量,更重要的是可以防止析碳反应的发生。但是过高的水碳比会使天然气的转化率降低,消耗增大。通过对自贡市富源化工有限公司小型合成氨厂天然气连续转化工艺中各项生产控制指标进行监测与对比实验,并进行水碳比的改变对转化和相关工序影响分析,得出水碳比由3.0降低到2.7后,可降低转化二段炉中氧气的消耗,提高补充的原料空气量,增加天然气的转化率,提高合成氨产量3%结论。

In some small synthesis ammonia factories, steam is needed to transform natural gas. Higher water-carbon ratio can not only recude the remnant methane content from the refomer exit, but also prevent the carbon precipitation reaction. However, if the water-carbon ratio is too high, the natural gas transformation ratio will reduce and the consumption will increase. According to the monitoring and contrast experiments of all the production guideposts during the natural gas transformation process in small snthesis ammonia factories of Zigong Fuyuan Chemical Engineering Limited Company, and through trying to change the water-carbon ratio and impact analysis on related process, this paper shows that if the water-carbon ratio reduces from 3.0 to 2.7, the consumption of Oxygen in the two-stage stove, and can also increase the complementary raw material air dose. Finally, the natural gas transformation ratio can be increased, and the production of synthesis ammonia can be increased 3%.