摘要
红外气体检测技术具有极高的准确性和灵敏度,同时具有动态测量范围大、响应时间快、不易受其他气体干扰等优点。因此使用高精度、高灵敏度、稳定耐用的在线或远程红外气体检测仪,对保证天然气安全生产具有重要意义。为此,针对现行检测方法存在精度不足等问题,采用红外气体传感技术结合可调谐激光光谱与波长调制技术,对天然气管道传输中的甲烷气体泄漏进行远距离检测,提高了测量精度;采用谱线分析法实时监测含硫天然气井喷或泄漏,在空气中水蒸气和甲烷气体的干扰下,根据谱线交叠情况建立起二元一次方程组,能够在不同浓度甲烷气体干扰下同时计算出甲烷和硫化氢的浓度,在71.4 mg/m3的甲烷干扰气体存在时,可以获得的最低可探测硫化氢浓度为15.2 mg/m3,达到了安全生产的要求。研究结果证明,红外气体检测技术在天然气安全生产中有着广泛的应用前景。
The infrared gas detection technology has many advantages like high accuracy and high sensitivity,a wide range of dynamic measurement,short response time,and the most important of all,it is not susceptible to the disturbance by other gases.That is why it is chosen by the way of either on line or remote control to ensure safe production in natural gas industry.Therefore,in view of such shortcomings of the existing detection technologies especially as a low accuracy,we adopted the infrared gas sensing technology in combination with tunable diode laser spectroscopy and wavelength modulation to conduct remote detection of the methane leakage in the long-distance gas pipelines,the accuracy of which is significantly improved as a result.On the other hand,we used the method of spectrum line analysis to perform the real-time monitoring of leakage and blowouts in H2S gas wells.Then we set up a binary linear equation group based on the overlapped spectrum lines under the condition of interference by steam in the air and methane gas,by use of which the contents of methane and H2S were both calculated under the disturbance by the methane gases with different contents.The lowest detectable concentration of H2S is 15.2 mg/m3 for the case of 71.4 mg/m3 methane gas as disturbance,which meets the requirement for safe production in natural gas industry.Research results demonstrate that the infrared gas detection technology has a wide application prospect in natural gas industry.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2011年第1期96-99,103,共5页
Natural Gas Industry
基金
国家高技术研究发展计划(863计划)项目(编号:2007AA06Z112
2007AA03Z446
2009AA03Z442)
吉林省科技厅项目(编号:20090422)
关键词
红外气体检测
天然气
硫化氢
泄漏
可调谐激光二极管
波长调制
气体吸收谱线
infrared gas detection,natural gas,H2S,leakage,tunable diode-laser absorption spectroscopy(TDLAS),wavelength modulation,gas adsorption spectrum
