煤半焦和沙柳炭混合物恒温共热解作用的研究

Interaction Effect of Isothermal Co-pyrolysis of Coal Coke and Salix psammophila Charcoal blends

采用先混合原沙柳和煤粉再制焦的次序,利用热重分析法研究了4种煤半焦和沙柳炭混合物的恒温共热解作用。从胜利煤的变温热解中,选定恒温共热解的温度400、500和600℃来研究温度对沙柳炭和胜利煤半焦混合物共热解作用的影响,结果显示400和600℃表现为协同作用,500℃表现为抑制作用,通过分析选择600℃作为恒温共热解温度。在600℃时,研究了沙柳炭与不同种类煤半焦在不同掺混比例下的恒温共热解,显示沙柳炭对挥发逸出能力较强或较低的煤半焦(霍林河煤和准格尔煤)均表现为抑制作用,对挥发分逸出能力中等的煤半焦(胜利煤和宝日希勒褐煤)表现为协同作用;受煤种的影响,掺混比例对共热解的作用效果大小无固定的排序。

Thermogravimetric analysis was used to study the interaction effects of isothermal co-pyrolysis of Salix psammophila（ Bsl） charcoal and 4 kinds of coal cokes. The isothermal co-pyrolysis temperatures 400,500 and 600℃ were selected from the temperature-programmed pyrolysis of Shengli lignite（ SL） to study the effects of temperature on the co-pyrolysis of Bsl charcoal and SL coal coke. The results showed that the interactions was synergy effect at 400 and 600℃,and the interaction was inhibition effect at 500℃. By analysis,the selected temperature of co-pyrolysis was 600℃. At 600℃,the isothermal co-pyrolysises of Bsl charcoal and coal cokes of different coal types at different blending ratios were analyzed. The results demonstrated that the interactions were inhibition effects for coal cokes with high content of volatilization（ Huolinhe lignite and Zhunge＇ er coal） and synergy effect for coal cokes with medium content of volatilization（ Shengli lignite and Baorixile lignite）. The interaction effect of coke mixture at different blending ratios had no fixed order for different coal types.