甲酸是核燃料后处理工程废液处理常用的脱硝剂,利用硝酸与甲酸在加热条件下生成氮氧化合物的气体而达到破坏多余硝酸的目的。甲酸脱硝反应涉及诱导期问题,实质是亚硝酸浓度问题,亚硝酸生成与HCOO*和HNO*两个基团密切相关。脱硝启动过程中加入亚硝酸钠使其浓度大于0.01mol/L,能减少甲酸脱硝诱导期,最大气体释放速率可减低至原值60%以下。 Formic acid is a commonly used denitration agent for the treatment of waste liquid of nuclear fuel reprocessing. Nitric acid and formic acid are used to generate nitrogen oxides under heating to achieve the purpose of destroying excess nitric acid. Formic acid denitration reaction involves the induction period problem, the essence is nitrite concentration problem, nitrous acid generation and HCOO * and HNO * two groups are closely related. During the process of denitrification, sodium nitrite is added to make the concentration more than 0.01mol / L, which can reduce the inducing period of formic acid denitration and the maximum gas release rate can be reduced below 60% of the original value.