选取三种典型农业废弃物～玉米杆、谷壳和棉杆为原料在自行设计的石英反应器上对其热解焦进行水蒸气气化,探讨热解焦气化过程中碱/碱土金属的析出规律.结果表明,三种样品焦气化过程中H2和CO是主要产气,H2析出量高于CO,且CH4析出量显著低于其热解阶段,这说明水蒸气气化强化了水煤气反应及去甲烷化反应,导致H2析出量增加,CH4析出量减少.在焦气化过程中12％～34％的碱金属以及12％～16％的碱土金属析出.
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