A Multiplexer System for Measurement of Gaseous Emissions

Transcription

1 A Multiplexer System for Measurement of Gaseous Emissions Cale Boriack Ronald Lacey, Saqib Mukhtar Atilla Mutlu, Sergio Capareda Bryan Shaw, Calvin Parnell, Jr.

2 Objectives Develop a method to increase productivity when sampling during a field campaign Automate data collection

3 Overview Sampling Methodology System Design Benefits of using a multiplexer Concluding remarks

4 Sampling Methodology Flux chambers 30 minute 7L/min input 30 minute 7L/min input 2L/min drawn from chamber vented

5 Sampling Setup Zero Air Generator Zero Air Air Compressor Multiplexer Analyzer Chamber Lift Vent Flux Chamber

6 Sampling Setup

7 Sampling Setup

8 Sampling Protocol each management area within the facility Grids placed in management area with one sample point in each boxed grid point order is random point within the box is random

9 Example Small Open lot 12 Grid points Start time is 9:00 am 1 multiplexer setup 3 chambers

10 9:01 am

11 9:05 am

12 9:31 am

13 9:35 am

14 10:01 am

15 10:05 am

16 10:31 am

17 10:35 am

18 11:01 am

19 11:05 am

20 11:31 am

21 11:35 am

22 12:01 pm

23 12:05 pm

24 12:31 pm

25 12:35 pm

26 1:01 pm

27 1:05 pm

28 1:31 pm

29 1:35 pm

30 2:01 pm

31 2:05 pm

32 2:31 pm

33 3:01 pm

34 System Design 23 solenoid valves 3 mass flow controllers 1 Mass flow meter 3 Flow valves Control system Outdoor Enclosure

35 System NC Solenoid Valve Design Mass Flow Controller, 15 L/min MFC1 S1 S2 S3 Zero air to Chamber Zero Air Generator S4 MFC2 Mass Flow Controller, 15 L/min S5 S6 To Additional Analyzers for Calibration Pressure Regulator MFC3 S7 Static Mixing Element S17 Calibration Gas Mass Flow Controller, 5 L/min S18 S19 Pressure Regulator Backflow Valve S8 NO Solenoid Valve MFM1 S20 S21 S22 To Chamber Lift System Dryer/Water Separator S9 S10 S16 Mass Flowmeter Vacuum Pump S23 S11 Air Compressor FV 1 S12 Mass Flowmeter Analyzer Flow From Chamber FV2 FV 3 S13 S14 MFM2 Teflon Vacuum Pump Adjustable Flow Valve, 2 L/min S15

36 Chamber Process Input: Start Chamber Check =0 =0 =0 Chamber ( = 1) Controller Chamber Processes Check = 0 Yes Write =1, =0 No Chamber mfc1 mfc2 T(chamber) : : sum Choose MFC If MFC 1 = 0 Write mfc 1 = 1 Else write mfc 2 = 1 Write Time = {current time} Input data Output Process information Yes Check Time () {current time} <Time+30 min No Write =0 =1 Input data Output Process information Yes Check Time () {current time} <time +60 min Output Log and save Data No Write = 0 mfc 1 =0 mfc 2 =0 End

37 Benefits of Multiplexing Ability to use equipment at full capacity Increase data collection capacity Increase sampling rate

38 Results from No multiplexer (2002) 16 hr/day, 4 days 29 samples 1 multiplexer (2003) 16 hr/day, 4 days 55 samples 1 multiplexer (2004) 24 hr/day, 4 days 127 samples

39 Additional requirements Computer control Error checking Data management Additional manpower

40 Concluding remarks Multiplexing allows more efficient use of resources Results in a lower cost to sample Multiplexer may be applicable to other gas sampling processes

41 Ya ll comin In here? I think they are!