Page 1 Page 2 福井工業大学研究紀要 第38号 2008 Standard gas
Contents
1. 23 NOx i NO NO i 22. 3 NO 4 NOx O NOx 5 NOx 1 NO 20075106 2007 NO 20075357 2007 3 APNA 370
3. Standard gas bomb NO 90ppm Standard gas generating unit Sampling gas constant concentration Measuring Points 4 23 8 at Motoshio cho along the Route 23 78 2 23 RN NOx 5 1 1 23 8 4
4. 3 2 2 90 90 NOx 77 8 NO concentration ppb S 8 8 8 8 8 8 8 time Sec Fig 4 Relationship between sampling period and response Deriod 8 20 NO concentration ppb time Sec Fig Comparison between integration value of input gas and output gas concentration a a NO concentration ppb 0 50 100 150 time sec Fig 6 Relationship between sampling period and response period 38 2008 90 90 K 1 90 1 R R R 7 4 K R R 2
5. 9 NO N 5 W NM ey time hour minute sec Fig 11 NOx concentration change according to the distance from crossing 79 38 2008 5 2 NOx NOx 5 13 8 S 14 NOx 8 C PA Z 1 70m N KN K 76 WE Em time hour minute sec 2m 20 Fig 12 NO gt
6. 4 SGGU 610 20 3 31 2
7. 38 2008 2 Measurement of air pollution status along roadway the 2 Repor0 Akira OGURI Time change of NOx concentration has been instantly and simultaneously meaSured at VariOuS points along roadway where traffic volume is huge The reason why instant values are applied instead of mean values measured by the roadside air pollution monitoring stations is that air pollution status is thought to be changing every moment In this report measurement results obtained by an improved system from the point of view for response and accuracy are going to be presented In addition NO concentration increase from vehicles with sophisticated after treatment systems such as DPF in the real worid has been focused by several researchers In this respect NO gt emission values are also analyzed and discussed 1 23
8. 9 NOx 10 EEE 11 5 Ng O j er NOx concentration ppb TAN SN SN SV eV SV Py SW time hour minute sec Fig 10 NOx concentration change 3 2 2 3 according to the distance from crossing NO 12 5 WO 8 400
9. NOx 1 NOx 1 OO NNN NRN 38 2008 Standard gas bomb NO 90ppm Sampling gas Standard gas generatnng unit NOx measuring unit Wind sensor Fig 1 NOx measuring unit and standard gas generating unit AID conversion NO NO 9 1 NO 90ppm Fig 2 Data acquisition system I NOx On line sampling frequency 2Hz Video Traffic FORTRAN camera volume program s 8 8 2 NOx g NS a Co AD
10. ed NR 7 2 0 5 5 180 4 4 4 90 7 3 TI 90 ppb lt thme change ofinput gas concentration gt 100 sec 100sec Fig 7 Response check of measuring unit
11. 25 25 cc 120 8 5 100 20 80 15 S ts 8 i 8 10 1 10 40 9 x 5 5 20 6 0 0 16 00 25 16 05 25 16 10 25 16 15 25 16 20 25 16 25 25 16 30 25 a 40 60 0 90 120 40 190 190 time hour minute sec NOx concentration ppb Fig 18 NOx O concentration Fig 19 Correlation between NOx O concentration 38 2008 6 NOx O NO 1 NOx 2 NOx
12. PC 3 3 Cour 3 2 3 1 NOx NOx 8 ER RN a Fig 3 Characteristics ofthe NOx measuring unit T T Cm T Cour 76 1 2 NO 90ppm 90ppb 1 3 10 30sec 2 4 90ppb 90se
13. 00 11 30 00 1 gD 11 40 00 1 45 00 11 50 00 11 55 00 time hour minute sec time hour minute sec Fig 15 NOx concentration decrease along with distance Fig 16 NO gt concentration decrease along with distance 5 3 NOx 0 NOx NOx O 17 Fig 17 Layout of measuring points NOx O 18 NOx Q 19 NOx NOx 03 180 35 35 x 5 0 SO 2 oa 140 oo
14. concentration change according to the distance from crossing 000 0m 2m 34m 70m Sm i 00 Qo 250 x QO 0 Zz 1 0 1000 0 100 0 1009 0 1000 2004 frequency Fig 13 Layout of measuring points Fig 14 NOx concentration decrease along with distance Table 1 NOx concentration decrease along with distance 0 m 2 m 34 m 70m Average DDb 36 1 314 154 86 Decrease rate 0 13 57 76 vs 0m a nite 686 547 403 164 Decrease Tate 0 20 41 76 vs 0m 80 2 15 16 NOx NO 8 40m 16 NO i 5 OR 9 5 on hs on J NO concentration ppb NO gt concentration ppb 5 660 0 49606 86 11 25
15. c 90ppb 5 A1 A2 90 3 2 3 2 1 1 1 3 1 90ppb 1 3 10 30sec 6 5 10sec 10
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