焦油模型化合物降解耦合铁矿直接还原炼铁

Coupling degradation of tar model compound and iron ore for direct-reduction ironmaking

为了有效提高生物质焦油的降解率，弥补传统催化剂的不足，以铁矿粉作为焦油降解的催化剂，将焦油降解与铁矿还原相耦合，利用还原金属铁的催化作用，促进焦油降解转化，同时强化铁矿还原。以香草醛、萘和邻苯二酚为焦油模型化合物，探讨热解温度对模型化合物转化率、热解气体产量以及铁矿粉还原度的影响。结果表明，600～1000％范围内，铁矿粉作用下，香草醛、萘及邻苯二酚的转化率均随热解温度的升高而增加。相同实验条件下，铁矿粉对3种焦油模型化合物的催化活性由高到低依次为萘〉香草醛〉邻苯二酚。生物质焦油中的萘组分对铁矿还原效果较好，1000qC铁矿还原度可达到78．5％。

In order to effectively enhance the rate of degradation of biomass tar and compensate for the lack of traditional catalysts, coupling degradation of biomass tar model compound with iron ore is used for direct-reduction ironmaking. The effects of reduction temperature on the conversion of the model compound （ vanillin, naphthalene and O- xylene） , pyrolysis gas production and reduction of iron ore are performed. The results show that the conversion of vanillin,naphthalene and O-xylene increases by increasing the pyrolysis temperature, in the range of 600 -1 000℃. Under the same experimental conditions,the catalytic activity of iron ore on the three tar model compounds in the descending order is naphthalene 〉 vanillin 〉 catechol. The naphthalene in the biomass tar has good reduction effect on the iron ore. The reduction rage can reach 78.5% at 1 000℃.