2018 April 3-5, Hyatt Regency, Calgary

Transcription

1 Global Analyzer Systems Ltd. Reducing Measurement Complexity and Costs in NO x Abatement Systems Presented by: Charles Odame-Ankrah, Ph.D., P.Chem. Senior Product Development Specialist Global Analyzer Systems Ltd. Presented at: 2018 April 3-5, Hyatt Regency, Calgary

2 Presentation Outline 2 1) Project Objectives 2) Challenges in NO x Measurement in Stacks 3) Upgrading a Chemiluminescent Analyzer 4) Field Trials 5) Conclusions

3 3 Project Objectives Create a device that enables existing analyzers to SELECTIVELY measure NO 2 Linear conversion over a wide dynamic range Simple external installation Efficiency immune to interference from NH 3 Fast response & high resolution Conversion efficiency >95% In order to. Reduce the potential inaccurate reporting of NO X Meet evolving Federal Regulations

4 Methods for NO x measurement in exhaust stacks 4 Continuous Emission Monitoring System (CEMS) Extractive Transfer a fraction of stack gas to analyzer for measurement Advantages: Easy to maintain Safer operation You don`t have to worry about sub-zero or hot weather conditions for servicing Use of ambient analyzers possible In-situ Directly measures gas in exhaust stack under prevailing temperature, pressure and moisture conditions

5 Dilution Extractive CEMS 5

6 Dilution Extractive CEMS 6 Measuring NO and NO 2 Main Method: Dilution Extractive Indirect Measurement of NO (via Chemiluminescence) NO 2 must converted to NO prior to detection 1) Heated Metal Converters (Mo/SS) + Efficient* + Long Life + Reliable* - Not specific - Susceptible to moisture/nh 3 2) *Photolytic Converter* + Selective to NO 2

7 7 Chemiluminescence - Principle State 1: NO Measurement Mode of Operation Sample inlet Moly > 300 C Detection Cell h v from only NO + O 3 reaction is measured NO, NO 2, NH 3, etc. o 3 Reported as NO Measurement

8 Chemiluminescence - Principle State 2: NO x Measurement Mode of Operation Heat can change NH 3 into NO 2! NO, NO 2, NH 3, etc. Sample inlet Moly NO, etc. > 300 C Detection Cell h v from only NO + O 3 reaction is measured o 3 Reported as NO x Measurement but is it? NO x Measurement NO Measurement = NO 2 + NH 3 1 E.J. Dunlea et al. Atmos. Chem. Phys., 7, (2007) Reported as NO 2! 8

9 NO x, NH 3 & Chemiluminescence 9 - Heated metal catalytic converters are non-selective. - Reduced converter efficiency? - Can NO 2 be over or under- estimated? - What are the implications? NO Detected as light (Chemiluminiscence) + O 3 NO 2* NO 2 NO 2 may be inaccurately measured

10 10 Sample conditioning with NH 3 A sample NH 3 scrubber An NH 3 scrubber set-up Installed prior to NO x analyzer inlet to enable: Heated Metal Converters (Mo/SS) to be + Efficient + Long Life + Reliable - Not specific - Added cost *Scrubber is a consumable

11 Global s Approach Integration of Photolytic Converter PhoNO NH 3 Scrubber Sample inlet Existing Setup Mo Detection Cell o 3 11

12 Selective NO 2 Photolysis NO 2 + hu NO + O 3 Efficient selective NO2 Photolytic Region ~ nm J.P. Burrows, et al., J. Quant. Spectrosc. Radiat. Transfer 60, (1998) J. Stutz, et al., J. Geophys. Res. 105, (2000) S.P. Sander, et al., JPL Publication 10-6, Jet Propulsion Laboratory, Pasadena,

13 Global s Approach Prototype PhoNO PhoNO integrated into Thermo 42i 13

14 Calibration of PhoNO 14 Over a wide linear dynamic range up to 37 ppm

15 Field deployment of PhoNO 15

16 Performance of PhoNO Odame-Ankrah, CA, et al. (2016), unpublished 16

17 Performance of PhoNO vs Protocol2 Time Protocol2 Data PHONO system data NO NO 2 NO X NO NO 2 NO X Moisture content = 10.28% Run #6 results 12: : : : : : : : : : : Protocol2 NO 2 average = 1.39 ppm PhoNO NO 2 average = 0.83 ppm Odame-Ankrah, CA, et al. (2016), unpublished 17

18 Plant data vs PhoNO vs Protocol2 NO X (ppm wet) PhoNO NO X (ppm wet) Plant Data (ppm wet) Moisture content = 10.28% Run #6 results Protocol2 NO x average =17.8 ppm PhoNO NO x average = 17.2 ppm Plant Data NO x average = 17.5 ppm Odame-Ankrah, CA, et al. (2017), unpublished 18

19 Plant data vs PhoNO vs Protocol2 NO Scrubber Using A Scrubber Odame-Ankrah, CA, et al. (2017), unpublished 19

20 20 Conclusion Create a device that enables existing analyzers to SELECTIVELY measure NO 2 Linear conversion over a wide dynamic range: From low ppb up to as high as 37ppm Simple external installation Up to 7 away from the analyzer Fast response & high resolution Making analyzers more robust Conversion efficiency >95% Achieved up to 100% stable conversion Direct replacement for Mo converters Low-cost add-on to existing analyzers And most importantly. No extensive analyzer modifications required to install

21 21 Acknowledgements Thank you to everyone who has contributed to this project, including: Research and Development Team Global Analyzer Systems Ltd Other Collaborators: Dr. Allan Legge

22 Questions? 22