选取了4种深冷空分制氮工艺,运用HYSYS模拟软件进行计算,综合评价比选各工艺。结果表明,双塔双冷凝器正流膨胀工艺较优,具有氮气产品含氧量低、比功耗最低的优势;对工艺中的关键运行参数进行单因素分析,得出关键参数的取值范围,为采用响应面多因素优化提供了编码水平;采用响应面优化后的关键参数,双塔双冷凝器正流膨胀工艺氮气中氧含量降低了7.7%、氮收率提高了9.63%、比功耗降低了7.69%,其中氮气中氧含量降低对降低注氮开采石油过程中氮气对井筒的腐蚀具有重要的作用。

Four kinds of cryogenic air separation nitrogen production processes are simulated and calculated by using HYSYS simulation software,and comprehensively evaluated and compared.The results indicate that the double-tower double-condenser positive flow expansion process is superior,with the advantages of low oxygen content in nitrogen products and the lowest specific power consumption.Key operating parameters in the process are analyzed in a single factor mode to obtain their value ranges,which provides a coding level for the response surface multi-factor optimization.By using the key parameters optimized by the response surface method,the oxygen content in nitrogen product from the double-tower double-condenser positive flow expansion process drops by 7.7%,the nitrogen yield increases by 9.63% and the specific power consumption decreases by 7.69%.More importantly,the decrease of oxygen content in nitrogen plays an important role in reducing the corrosion of nitrogen to the wellbore in the process of nitrogen injection and oil recovery.