高压天然气管道内颗粒物在线检测结果校正方法

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12 MPa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6.3 MPa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0.65~9.5 mm修正为0.55~7.2 mm. 修正前在线测量浓度为4.04 mg/m3，离线测量浓度为2.76 mg/m3，二者偏差约为46%，修正后在线检测平均浓度约为2.83 mg/m3，与离线测量浓度的偏差小于5%.

Experimental Research on Online Determination Technology of Particles in High Pressure Natural Gas Pipeline

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 mm to 0.55~7.2 mm. 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%.