亚临界水条件下煤中汞的脱除

摘要: 运用半连续反应装置对山西吴家坪煤中汞在亚临界水中的脱除规律进行了研究。考察了反应温度为290 ℃、320 ℃ 、350 ℃、 380 ℃，反应压力为5 MPa、10 MPa、15 MPa,萃取时间为10 min、30 min、60 min、100 min时对汞脱除率的影响。结果表明，在290 ℃～380 ℃，随着温度升高，汞脱除率明显增加；在5 MPa～15 MPa，压力越大，汞的脱除率也越大；在10 min～100 min，随着萃取时间的延长，汞脱除率增加；在380 ℃, 15 MPa, 1 h，汞的脱除率最大可达96％以上。

Abstract: The removal of mercury from coal using sub-critical water extraction in a semi-continuous reactor was studied. The effect of temperature, pressure and extraction time on the removal rate of mercury was examined. The results show that in the temperature range 290 ℃～380 ℃, the higher the temperature is, the larger the mercury removal rate is. And the mercury removal rate increases with reaction pressure and residence time under the pressures from 5 MPa to 15 MPa and residence time from 10 min to 100 min. The maximum removal rate of mercury can reach above 96% under the conditions of 380 ℃, 15 MPa and 60 min.