固定燃烧源排放N2O的采样,分析方法及其监测

烟道气是一含有多种哗合物的复杂体系，除Ｎ２，Ｏ２外，还含有燃烧产物Ｈ２Ｏ，ＣＯ２ＣＯ，ＮＯｘ，ＳＯ２和Ｈ２Ｓ等，烟气样在贮放过程中它们之间相互影响，使各自的浓度发生变化，为了得到烟气中Ｎ２Ｏ含量的准确测定值，分别研究了Ｈ２Ｏ，ＳＯ２和ＮＯ的含量，放置时间对Ｎ２Ｏ生成量的影响，试验结果表明，玻璃注射器不适于贮放烟气样，样品中只有Ｈ２Ｏ，ＳＯ２和ＮＯ三种化合物同时存在时，才会有进一步的Ｎ２Ｏ的生成，其

STUDIES ON SAMPLING AND ANALYZING METHODS OF N_2O FROM STATIONARY SOURCES AND N_2O EMISSION MEASUREMENT

The flue gas is a complex system consisting of many components. Besides N2 and O2. it also contains products of combustion,such as:H2O,CO2,CO,HC,NOx,SO2,HS,etc. During the storage of flue gas sample, these components could react with each other and result in the changing of their concentrations. In order to measure the N2O content in flue gas sample accurately, the influences of the contents of HaO,SO2 and NO in the sample and the time period of the sample storage on the N2O formation were investigated. The results show that glass syringe is not suitable for sample storage. The further formation of N2O after sampling occures only in the case of simultaneously presenting H2O,SO2and NO,and closely depends upon their concentrations and period of storage. After removing H2O and SO2,the measurements show that N2O emission is the lowest,about 0. 6ppm from boiler using powdered coal,and the highest one,up to 31. 2ppm from circulating flu-idized bed boiler.