磷酸二氢铵对生物质燃烧过程中颗粒物排放特性的影响

Effect of NH4H2PO4 Additives on PM emissions From the Combustion of Biomass

使用立式管式炉燃烧装置研究不同添加比例的磷酸二氢氨对生物质燃烧过程中颗粒物(particulate matter,PM)排放特性的影响。研究表明,NH4H2PO4的添加可有效减少颗粒物总量PM10尤其是PM1的排放量,并且减排效果与P/K摩尔比密切相关。当P/K摩尔比为1时,PM1和PM10的减排效果最好,分别达到44.43%和30.70%。减排主要是由于NH4H2PO4与玉米秆中的K盐反应生成K-Ca磷酸盐,K-Mg磷酸盐化合物,将K固定在底灰中,有效抑制了K盐向气相中释放并最终达到降低PM排放的目的。研究结果可为玉米秆燃烧过程中颗粒物减排提供理论支撑。

In this work,a fixed bed reactor was used to investigate the effects of the addition of NH4H2PO4 additives on the emission characteristics of particulate matter(PM)from corn stalk combustion.The addition of NH4H2PO4 additives could effectively reduce PM10 emission especially PM1 emission and the reduction was closely related to the molar ratio of P/K in the ash.Under the current experiment condition,the optimal PM reduction effect was achieved when the molar ratio of P/K was 1.The reaction between NH4H2PO4 additives and K salts in corn stalk ash,which effectively reduced the release of K to gas phase,was attributed to the reason of PM reduction.This study could provide scientific guidance for the mitigation of PM emissions during the combustion of corn stalk.