生物质热解和燃烧过程中钾的析出迁移特性研究

• 作 者: 叶家铭 靳熹 杨金鑫 邓磊 车得福
• 机 构: 西安交通大学动力工程多相流国家重点实验室,
• 出 处: 工程热物理学报
• 发表日期: 2017年09期
• 关键词: biomass alkali metals release characteristic pyrolysis combustion

生物质在热转化过程中,部分K进入到气相,会造成高温对流受热面积灰结渣和高温腐蚀等严重问题。本文利用固定床实验系统对生物质热解和燃烧过程中碱金属的析出迁移特性展开了研究。实验结果表明:温度升高有助于小麦秸秆中K元素的析出,而氧化性气氛能促进K元素的析出;小麦秸秆和稻壳的热解析出曲线差异较大,燃料种类对K元素的析出起着决定性作用;在所研究的温度范围内,水溶性K的析出占据着主导地位。

During the thermal conversion of biomass, part of K enters the gas phase, causing serious problems such as high temperature convection heating area ash slagging and high temperature corrosion. In this paper, the use of fixed bed experimental system of biomass pyrolysis and combustion process of alkali metal precipitation migration characteristics were studied. The experimental results showed that the increase of temperature was beneficial to the precipitation of K element in wheat straw, while the oxidizing atmosphere could promote the precipitation of K element. The pyrolysis of wheat straw and rice husk varied greatly, Plays a decisive role; in the studied temperature range, the precipitation of water-soluble K occupy the dominant position.