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| 固定污染源NMHC-CEMS样品传输管线加热的必要性问题探究 |
| Discussion on the Necessity of Heating NMHC-CEMS Sample Pipeline in Stationary Source |
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| DOI： |
| 中文关键词: 非甲烷总烃 在线监测系统 样品传输管线 固定污染源 |
| 英文关键词: Non-methane hydrocarbon CEMS Sample pipeline Stationary source |
| 基金项目:生态环境部国家标准绿色通道基金资助项目（2019-L-16） |
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| 中文摘要: |
| 针对非甲烷总烃在线监测系统（NMHC-CEMS）样品传输管线在不同伴热温度下对辛烷的吸附作用，以及管线自身的挥发情况开展研究。试验表明：在室温条件下，低、中、高质量浓度的辛烷标气在不锈钢传输管线中均有较为明显的吸附残留，在≥90 ℃的伴热条件下，辛烷在传输管内残留量对测定结果基本无影响，残留量明显低于1%，说明对样品进行加热传输是保证NMHC-CEMS测定结果准确性的必要措施。PTFE和PFA材质伴热管线在高温伴热下挥发明显，而不锈钢伴热管线更适用于NMHC-CEMS样品的传输。 |
| 英文摘要: |
| The adsorption of octane on the sample pipelines of non-methane hydrocarbon continuous emission monitoring system(NMHC-CEMS) at different heat tracing temperatures and the volatilization of the pipeline itself were studied. The results showed that octane standard gas with low, medium and high mass concentration had obvious adsorption residues in the stainless steel pipeline at room temperature. The residue amount of octane in the pipeline had no effect on the determination results under the heat tracing condition of less than 90 ℃, the residue amount was obviously lower than 1%, indicating that heating transmission of samples was a necessary measure to ensure the accuracy of NMHC-CEMS determination results. PTFE and PFA heat tracing pipelines volatilized obviously under high temperature heat tracing, while stainless steel heat tracing pipelines were more suitable for NMHC-CEMS sample transmission. |
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