块状废轮胎固定床热解特性实验研究

Experimental study on pyrolysis of blocky tires in a fixed-bed reactor

国内外对于废旧轮胎热解的研究大多集中在对轮胎小颗粒的探索上,对于破碎成本较低的大块状轮胎的热解较少有人涉及。为了探究块状轮胎的热解特性,文章在外热式固定床热解炉上进行了不同热解温度下块状废轮胎热解特性的实验研究。结果表明:块状废轮胎热解产生的燃气成分主要为CH4,H2以及大分子烃类CnHm,且其燃气产率随热解温度的升高而增加。当热解温度高于550℃时,热解产物CnHm有二次裂解现象,热解产生的燃气具有较高热值;热解温度为600℃时,燃气热值可以达到26 MJ/m3;随着热解温度的提高,热解炭中挥发分含量减少,固定碳含量略有增加,热解温度对热解油及热解气产率影响明显。与小颗粒轮胎相比,块状轮胎热解气中小分子气体CH4,H2等含量相对较少,而大分子烃类含量相对较多。热解产物产率方面,热解炭和热解气的产率更大,焦油产率降低。

Pyrolysis of tire researches are mostly concentrated in tiny particles and seldom involved in those blocky tires with low preparation cost . In order to investigate the pyrolysis characteristic of blocky tire, a series of experiments were carried out in an external heating fixed-bed reactor at different pyrolysis temperatures. The results showed that the major constituent of pyrolysis gas was CH4,H2 and macromolecular hydrocarbon （CnHm）, and the yield raised with the increasing temper- ature. The calorific value of pyrolysis gas was very high and it could be up to 26 MJ/m^3 at 600 ℃. The content of volatile in pyrolysis char decreased with the increasing temperature, in contrast to the fixed-carbon.Pyrolysis temperature has a significant influence on the yield rate of pyrolysis oil and gas. Compared with tiny tire particle, the content of micromolecular gas such as CH4 and H2 is relatively lower but the macromolecular gas hydrocarbon （CnHm） gets higher. The yield of pyrolysis carbon and gas are higher, but the tar production rate decreases.