高压天然气管道内颗粒物在线检测结果校正方法
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摘要
采用在线检测装置对天然气管道内颗粒物进行了实验测定,该装置可在操作压力12MPa下无需减压装置直接对高压天然气内的颗粒物浓度和粒径分布进行检测.在6.3MPa压力下,对国内某天然气站管道内颗粒物的特性进行了检测,分析了影响在线测量结果的因素,以离线测量数据为基准,提出了修正方法,对在线测量所得粉尘颗粒物的粒径分布和浓度进行了修正,在线检测所测粒径范围由0.65～9.5μm修正为0.55～7.2μm.修正前在线测量浓度为4.04mg/m3,离线测量浓度为2.76mg/m3,二者偏差约为46%,修正后在线检测平均浓度约为2.83mg/m3,与离线测量浓度的偏差小于5%.
Specific to the requirements for character assessment and model selection of filtration and separation facilities in high pressure natural gas pipeline transportation station, a particulate matter measurement device for natural gas pipeline is developed, and its characteristics tested. Concentration and particle size distribution of particulate matters in high pressure natural gas pipeline can be determined directly with the device under 12 MPa pressure without pressure reduction. Characteristics of particulate matters in the pipeline of a domestic natural gas station are measured under 6.3 MPa pressure by using online device and off-line isokinetic sampling methods. Analyzing the influences on on-line measurement results, a correction method is proposed based on off-line measurement results. After the correction of on-line detection, the particle size range is shifted from 0.65～9.5 μm to 0.55～7.2 μm. Before correction, online average concentration measurement with a result of 4.04 mg/m3 is obtained, offline average concentration measurement with a result of 2.76 mg/m3, there is about 46% deviation between them. After correction, the online measured average concentration is around 2.83 mg/m3, the deviation between off-line and on-line measurements is less than 5%.
Specific to the requirements for character assessment and model selection of filtration and separation facilities in high pressure natural gas pipeline transportation station, a particulate matter measurement device for natural gas pipeline is developed, and its characteristics tested. Concentration and particle size distribution of particulate matters in high pressure natural gas pipeline can be determined directly with the device under 12 MPa pressure without pressure reduction. Characteristics of particulate matters in the pipeline of a domestic natural gas station are measured under 6.3 MPa pressure by using online device and off-line isokinetic sampling methods. Analyzing the influences on on-line measurement results, a correction method is proposed based on off-line measurement results. After the correction of on-line detection, the particle size range is shifted from 0.65～9.5 μm to 0.55～7.2 μm. Before correction, online average concentration measurement with a result of 4.04 mg/m3 is obtained, offline average concentration measurement with a result of 2.76 mg/m3, there is about 46% deviation between them. After correction, the online measured average concentration is around 2.83 mg/m3, the deviation between off-line and on-line measurements is less than 5%.
引文
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[2]Lu Y,Glass D H,Easson W J.An Investigation of Particle Behavior in Gas-Solid Horizontal Pipe Flow by an Extended LDA Technique[J].Fuel,2009,88(12):2520-2531.
[3]Xiong Z,Ji Z,Wu X,et al.Experimental and Numerical Simulation Investigations on Particle Sampling for High-pressure Natural Gas[J].Fuel,2008,87(13/14):3096-3104.
[4]Olszowski T,Pospolita J.Conditions of Dust Sampling in Pneumatic Conveying through the Horizontal Pipeline[J].Powder Technol.,2007,171(1):1-6.
[5]张星,姬忠礼,陈洪海,等.高压天然气管道内粉尘在线检测方法[J].化工学报,2010,61(9):2334-2339.
[6]Schmidt M,Schütz S,Miter L.Counting and Measuring Particles Sized from Soot to Pollen[J].China Particuology,2007,5(5):359-361.
[7]Heima M,Mullinsb J B,Umhauera H,et al.Performance Evaluation of Three Optical Particle Counters with an Efficient“Multimodal”Calibration Method[J].J.Aerosol Sci.,2008,39(12):1019-1031.
[8]Damaschke N,Gouesbet G,Gréhan G,et al.Response of Phase Doppler Anemometer Systems to Nonspherical Droplets[J].Appl.Opt.,1998,37(10):1752-1761.
[9]Seville J P K,Coury J R,Ghadiri M,et al.Comparison of Techniques for Measuring the Size of Fine Non-spherical Particles Part[J].Part.Charact.L.,1984,1(1/4):45-52.
[10]International Standard.ISO13320-1Particle Size Analysis—Laser Diffraction Methods[S].
[11]Heller W.Remarks on Refractive Index Mixture Rules[J].Phys.Chem.,1965,69(4):1123-1129.
[12]Sano Y,Nakagaki M.Refractive Index Increment of a Colloidal Dispersion of Small Spheroidal Particles[J].J.Phys.Chem.,1984,88(1):95-99.
[13]Heyder J,Gebhart J.Optimization of Response Functions of Light Scattering Instruments for Size Evaluation of Aerosol Particles[J].Appl.Opt.,1979,18(5):705-710.