焦炉气制甲醇工艺的改造

针对唐山中润煤化工有限公司20万t/a焦炉气制甲醇生产装置存在的压缩机打气量有限,合成塔负荷大,CO转化率偏低等问题,在对焦炉煤气制甲醇工艺进行系统研究的基础上,对其进行了扩能改造。在煤气进入压缩机前增加一台横管式煤气冷却器,增加了煤气实际通量;对原有压缩机进行扩缸改造,增大现有压缩机打气量,提高煤气有效利用率。改造后,夏季焦炉气压缩机打气量由142.29万m3/d增至152.23万m3/d,甲醇产量提高50.33 t/d。新增合成塔一台,采用与老合成塔并联的方式进行连接。新增合成塔后出口气体(循环气)中的有效气体成分CO和CO2体积分数均明显降低,分别由改造前的5.20%和3.79%降至改造后的0.78%和0.85%,CO单程转化率平均值由40%增至78%,平均每天增加甲醇产量29 t,达到预期目的。 There were lots of problems in 2 × 105t / a methanol production device in Tangshan Zhongrun Coal Chemical Co.,Ltd.,such as lower coke oven gas flow,higher synthetic tower load and lower CO conversion rate. Based on the systematic analysis of process,conduct the transformation. Cool the gas with a cross-tube gas cooler first to increase the gas content,then compress the gas. Increase the gas. After transformation,the coke oven gas capacity increase from 1. 4229 × 106m3/ d to 1. 5223 × 106m3/ d. The methanol yield increase by50. 33 t / d. The added synthesis reactor is connected in parallel with the old one. The CO and CO2content in synthetic gas reduce from5. 20 percent and 3. 79 percent to 0. 78 percent and 0. 85 percent. The average conversion rate of CO increase from 40 percent to 78 percent. The average yield of methanol increase by 29 tons per day