INTHUU MEASUREMENTS CC

Transcription

1 INTHUU MEASUREMENTS CC VAT REG NO.: REG NO.: 2009/190265/23 P.O. Box Bredell, 1623 Plot 2/410 Seventh Road Bredell A/H, Kempton Park, 1619 Tel: +27 (0) Fax: +27 (0) Eskom Holdings SOC Ltd Kriel Power Station Attention: Mr. Spha Biyela Private Bag X5009 Kriel 2271 Date Your Reference Our Reference Enquiries CC Scheepers 10 March 2017 Order No.: SPO235/SPO240 RCCS267(0) Cell: REPORT 2017/03/02/RCCS267(0) PARTICULATE MATTER AND PARALLEL GASEOUS EMISSION MEASUREMENTS FROM THE FLUE OF SOUTH STACK AT KRIEL POWER STATION Herewith the report for the particulate matter and gaseous emission measurements carried out between the 21 st of December 2016 and the 19 th of February Tests were carried out from the flue of South Stack. We thank you for the opportunity to be of service and trust that your requirements have been interpreted correctly. If you have any queries, please contact us at the above numbers, we will gladly assist. Yours faithfully Inthuu Measurements cc CC Scheepers Page 1 of 55

2 INTHUU MEASUREMENTS CC Prepared by: Issued by: Accepted by: Stack testers MT Matlou AV Makama T Liphoto... pp (Signature) T Liphoto... (Signature) CC Scheepers... (Signature) S. Biyela Senior Advisor: Emission Tech. Support REPORT CUSTOMER : ESKOM HOLDINGS SOC LTD OPERATING COMPANY : KRIEL POWER STATION TYPE OF MEASUREMENT : PARTICULATE MATTER AND PARALLEL MEASUREMENTS OF COMBUSTION GASES TITLE : PARTICULATE MATTER AND PARALLEL GASEOUS EMISSION MEASUREMENTS FROM THE FLUE OF SOUTH STACK AT KRIEL POWER STATION ORDER No s. : SPO235/SPO240 REPORT No. : 2017/03/02/RCCS267(0) REPORT DATE : 10 MARCH 2017 COPYRIGHT ON THIS DOCUMENT IS RESERVED. PUBLICATION OR DISSEMINATION OF ITS CONTENTS WITHOUT WRITTEN PERMISSION IS NOT ALLOWED. Page 2 of 55

3 Index Summary Glossary Index 1. Measurement Objective 5 2. Plant Description and Materials Handled 5 3. Description of the Measurement Site 5 4. Measurement and Analytical Methods and Apparatus 6 5. Plant Operating Conditions during the Measurements 6 6. Presentation of Measurement Results, Discussion and Recommendation 7 Page 3 4 Appendices A. Plant Parameters B. Calibration Functions C. Monitor calibration certificates D. Reference gas and equipment calibration certificates 7. Revisions 8. Distribution list Summary: Plant : Kriel Power Station Operating times : 24 hours Emission source : Power generation - fossil fuel boilers Measured components : PM, SO 2, NO X, CO 2 and O 2 Date of measurement : 21st December 2016 to 19th February Emission source No. Atmospheric Emission Limit Measurement results : : South Stack 125mg/Nm 3 (d) at 10% O 2 1. The O 2, SO 2 and NO 2 of the AMS on the South Stacks pass the variability test. 2. The CO 2 of the AMS on South Stack fails the variability test. 3. Twelve measurements at various loads showed particulate matter emission concentrations between 67.5 and mg/nm3 (d) at 10% O 2 4. PM function as found for AO1 ( SL), y = *mA PM function as found for AO2 ( SL), y = *mA PM function recommended for AO1 (0 800 SL), y = *mA PM function recommended for AO2 ( SL), y = *ma Stack gas flow function for Unit 4, g = a Stack gas flow function for Unit 5, g = a Stack gas flow function for Unit 6, g = 2.264a Measured component Unit of measure Maximum Limit value South Stack SO 2 [mg/nm 3 (d)] at 10% O NO 2 [mg/nm 3 (d)] at 10% O CO [mg/nm 3 (d)] at 10% O CO 2 [mg/nm 3 (d)] at 10% O O 2 [% (d)] Page 3 of 55

4 GLOSSARY The following abbreviations were used in the text, figures and Tables: AMS Automated Measurement System SRM Standard Reference Method CEM Continuous Emission Monitor PM Particulate Matter ESP Electrostatic Precipitator FFP Fabric Filter Plant MCR Maximum Continuous Rating C Degrees Celsius Pa (g) Gauge pressure in Pascal kpa (abs) Absolute pressure in kilo Pascal % v/v Percentage on a Volume-by-Volume basis Am 3 Actual Cubic Metres Nm 3 Normal Cubic Metres Am 3 (w) Actual Cubic Metres on a wet basis Nm 3 (w) Normal Cubic Metres on a wet basis Am 3 (d) Actual Cubic Metres on a dry basis Nm 3 (d) Normal Cubic Metres on a dry basis ATPD Actual Temperature and Pressure Dry NTPD Normalised Temperature and Pressure - Dry g/s Grams per second mg/s Milligrams per second dp Differential pressure AO Analogue Output Actual refers to the measured temperature and pressure conditions of the gases in the duct. Normal or Standard refers to the actual conditions being normalised to 0 C and 101,325 kpa. Page 4 of 55

5 1 MEASUREMENT OBJECTIVE Kriel Power Station has installed Automated Measuring Systems (AMS) for the monitoring of emissions in compliance with the National Environmental Management: Air Quality Act, 2004 (Act No. 39 of 2004). Inthuu Measurements CC was contracted by Kriel Power Station to perform parallel measurements to determine AMS s calibration functions on the South Stack and particulate matter measurements to determine a linear regression allowing the reporting of emissions from the AMS. Constants are derived from the gravimetric measurements by a Standard Reference Method (SRM) and the corresponding AMS signal. The correlation function must report emissions at normal running condition, but must at the same time be able to indicate excursions over the Ambient Emission Limit when plant problems occur. Sick Automation Southern Africa performed a calibration on the Sick SB100 dust monitor on the 23 rd of March Inthuu Measurements did not have the opportunity to witness the calibration of the monitor prior to the tests. Two analogue outputs from the dust monitor were available for recording monitor output. Tests were carried out between the 21 st and 22 nd of December 2016 for gaseous emissions. For particulate matter, tests were carried out between the 14 th and 19 th February PLANT DESCRIPTION AND MATERIALS HANDLED The power station currently operates six power generation units, each consisting of a steam driven turbine and a boiler supplying the steam. The boilers are specially designed to burn low grade coal, which contains high percentages of ash and sulphur. The pulverized fuel burners were upgraded to low NOx burner technology. Units 1, 2 and 3 are supplied with coal from an underground mine, while units 4, 5 and 6 are supplied from an opencast coal mine. Each unit is equipped with particulate matter abatement technology. Kriel uses Electrostatic Precipitators (ESPs) to clean the boiler waste gases. The efficiency of the ESPs is enhanced by the implementation of SO3 flue gas conditioning (SO3 FGC). No further emission abatement technology is implemented at Kriel Power Station. 3 DESCRIPTION OF THE MEASUREMENT SITE The measuring site is located on the outside of a single-flue stack. The single flue emits emissions from Unit 4, 5 and 6 simultaneously. The height of the stack is approximately 180m tall and is equipped with 2 platforms; platform 1 is the measurement platform at approximately 146m and platform 2 is at the exit from the stack for maintenance purposes. The bottom Page 5 of 55

6 flues enter directly into the stack without any turning vanes and this in turn causes disturbances in the velocity pattern. The stack consists of a concrete outer wind shield. The wind shield is protected from the high temperature and chemically aggressive gases by a refractory brick lining. The monitors are installed directly onto the concrete outer shield. The alignment of the monitors is very stable. Both the gaseous and particulate matter AMSs are positioned on the measurement level. 4 MEASUREMENT AND ANALYTICAL METHODS AND APPARATUS Compound Method Comment Velocity USEPA Method 2 Particulate Matter USEPA Method 17 Inside stack filtering Combustion gases: Horiba PG 250 Portable Gas Analyser O 2 Zirconium cell The analyser calibration was verified CO 2 NDIR before and after the tests using CO NDIR reference gases. SO 2 NDIR NO x Chemiluminescence Homogeneity BS EN 15259:2007 Report format BS EN 15259:2007 Correlation function Eskom prescribed format Variability test Eskom prescribed format The spread sheet with areas provided for filling in SRM and AMS values The spread sheet with areas provided for filling in SRM and AMS values 5 PLANT OPERATING CONDITION DURING THE MEASUREMENTS 5.1 PRODUCTION PLANT Unit 4 was off for maintenance during gaseous measurements tests; two out of the three units were running. This is acceptable and within the Eskom requirements that more than 50% of the units on a single flue stack must be in operation during parallel tests. All Units were running during the Particulate matter correlation. Normal running conditions were maintained during the gaseous monitor correlation. During Particulate matter emissions tests, it was requested that soot blowing be carried out and completed, on each of the units under test, at a time before the start of the tests. It was also requested that the loads on the Units in operation be similar in order to achieve a similar gas flow rates into the stack. The tests were carried out at a condition which represents the normal state of power production. The coal which was burnt during the test period was the normal supply. Additional operating data is tabulated in the Appendices. A list of appendices is given in sub-section 6.2. Page 6 of 55

7 5.2 WASTE GAS CLEANING UNITS Kriel Power Station employs Electrostatic Precipitators (ESPs) for gas cleaning in terms of particulate matter. No gaseous emission abatement is available. The efficiency of the ESPs is enhanced by the implementation of SO3 flue gas conditioning (SO3 FGC). The ESPs were in service during the tests. The ESP de-dusting is a continuous automated system. Boiler ashing is a manual processes. The tests and cleaning operations were scheduled so that they would not coincide. 6 PRESENTATION OF MEASUREMENT RESULTS, DISCUSSION AND RECOMMENDATION 6.1 EVALUATION OF THE OPERATING CONDITIONS DURING THE MEASUREMENTS Particulate Matter emissions measurements Twelve tests were carried out over 5 days. Normal operating conditions were maintained for the duration of the emission survey. The tests were carried out at a constant load for the full duration of each test. Low, mid and high loads were arranged to achieve a spread in the emission concentrations. The actual minimum and maximum loads were between 240MW and 470MW for Unit 4, 380MW and 410MW for Unit 5 and 380MW and 430MW for Unit 6. Although it was requested for the three units to run at equal loads, it was not possible to comply with that request. The economiser outlet oxygen levels were representative of normal running excess air levels. Air ingress, in the form of in-leakage, may be expected at the air heaters and the FFP dust hoppers under normal running conditions. No abnormal ingress of air was noticed from the O 2 readings in the stack. Gaseous emissions measurements The parallel tests were carried out at normal running conditions, which included load variation, soot blowing, and mill changes. No specific loads were requested. No extraordinary operating occurrences were reported during the parallel tests. The load which was obtained for the parallel tests ranged between 419MW and 430MW for Unit 5 and between 409MW and 480MW for Unit MEASUREMENT RESULTS AND DISCUSSION Particulate Matter correlation The correlation function was determined from twelve tests. No test was omitted from the calculations. The function yields the emission in mg/nm 3 temperature, pressure, moisture and oxygen. (d) at 10% O2 corrected for Below is a summary of the main relevant plant and test parameters. Page 7 of 55

8 Test No. Actual Boiler load (MW) U4 U5 U6 Measured Gas flow Total Air flow [Kg/s] [Nm 3 /s (d)] at U4 U5 U6 Sum 10% O 2 All the face velocities were above 3 cm/s as specified in the Eskom Standard. The Isokineticity was between % for all tests. Dust Concentrati on Average face % Isok Nozzle diameter Comment velocity mg/nm 3 (d) at 10% O 2 cm/s % mm The following table gives the pertinent monitor information and correlation parameters for the as found conditions. Plant: Location of Monitor Make: Model: Monitor serial number: Reflector serial number: Channel Analogue Output AO 1: SB Analogue Output AO 2: Measuring range (mg/m 3 ) DCS measuring range (mg/nm 3 ) at 10 %O Output range (ma): Info for DCS ma Emission Emission % Output Emission Emission Constants for Linear function (ma) m ma = c ma = Constants for Linear function (%) Unit 4, 5 and 6 South Stack SICK m % = c % = Page 8 of 55

9 Detailed results from sampling process: Customer Kriel P/S Unit No. Unit 4, 5 & 6 Location SS Test No Stack tester: TL TL TL TL Date dd-mm-yy 2017/02/ /02/ /02/ /02/15 Start Time HH:mm:ss 10:21:00 14:07:00 13:36:00 15:18:00 End Time HH:mm:ss 11:37:00 15:22:00 14:48:00 16:29:00 Boiler load MW Outlet Conditions. Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Velocity m/s Duct area m Gas Volume Flow (Qact) Am3/s Gas Volume Flow (Qnw) Nm3/s Gas Volume Flow (Qnd) Nm3/s Gas Volume Flow (Qnd 10 %O2) Nm3/s Gas flow rate kg/s Thimbles used QG7 QG8 QG10 QG11 Gas density in duct kg/m Sampling time Minutes Nozzle diameter mm Field Blank used QG9 QG9 QG13 QG13 Gas Volume Sampled (Vact) Am3 (w) Gas Volume Sampled (Vnw) Nm3 (w) Gas Volume Sampled (Vad) Am3 (d) Gas Volume Sampled (Vnd) Nm3 (d) Dust Concentration mg/am3 (w) Dust Concentration mg/nm3 (w) Dust Concentration mg/am3 (d) Dust Concentration mg/nm3 (d) Measured O2 % % Correction factor 10% Dust Concentration Normalised to 10% O2 mg/nm3 10% O Outlet Dust Flowrate mg/s Moisture Concentration g/nm3 (d) Average Face velocity m/s Isokineticity % Average O/M Signal AO2 ma Measured Extinction SL Extinction Range AO Extinction Range AO Average O/M Signal AO1 ma Page 9 of 55

10 Test No Stack tester: TL TL TL TL Date dd-mm-yy 2017/02/ /02/ /02/ /02/16 Start Time HH:mm:ss 16:57:00 09:23:00 10:59:00 13:49:00 End Time HH:mm:ss 18:07:00 10:34:00 12:15:00 15:04:00 Boiler load MW Outlet Conditions. Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Velocity m/s Duct area m Gas Volume Flow (Qact) Am3/s Gas Volume Flow (Qnw) Nm3/s Gas Volume Flow (Qnd) Nm3/s Gas Volume Flow (Qnd 10 %O2) Nm3/s Gas flow rate kg/s Thimbles used QG12 QG14 QG15 QG16 Gas density in duct kg/m Sampling time Minutes Nozzle diameter mm Field Blank used QG13 QG19 QG19 QG19 Gas Volume Sampled (Vact) Am3 (w) Gas Volume Sampled (Vnw) Nm3 (w) Gas Volume Sampled (Vad) Am3 (d) Gas Volume Sampled (Vnd) Nm3 (d) Dust Concentration mg/am3 (w) Dust Concentration mg/nm3 (w) Dust Concentration mg/am3 (d) Dust Concentration mg/nm3 (d) Measured O2 % % Correction factor 10% Dust Concentration Normalised to 10% O2 mg/nm3 10% O Outlet Dust Flowrate mg/s Moisture Concentration g/nm3 (d) Average Face velocity m/s Isokineticity % Average O/M Signal AO2 ma Measured Extinction SL Extinction Range AO2 Extinction Range AO1 Average O/M Signal AO1 ma Page 10 of 55

11 Test No Stack tester: TL TL TL TL Date dd-mm-yy 2017/02/ /02/ /02/ /02/19 Start Time HH:mm:ss 15:39:00 14:44:00 10:25:00 12:01:00 End Time HH:mm:ss 16:54:00 16:01:00 11:36:00 13:12:00 Boiler load MW Outlet Conditions. Gas Temperature C Barometric pressure kpa (g) Duct pressure Pa Duct pressure kpa (abs) Moisture Mass mg Moisture %v/v Oxygen % Velocity m/s Duct area m Gas Volume Flow (Qact) Am3/s Gas Volume Flow (Qad 10 %O2) Am3/s Gas Volume Flow (Qnw) Nm3/s Gas Volume Flow (Qnd) Nm3/s Gas Volume Flow (Qnd 6 %O2) Nm3/s Gas Volume Flow (Qnd 10 %O2) Nm3/s Gas flow rate kg/s Thimbles used QG18 QG20 QG22 PZ17 Gas density in duct kg/m Sampling time Minutes Nozzle diameter mm Field Blank used QG19 QG21 PZ18 PZ18 Mass gain by F/B mg Sampled dust mass mg Dust mass mg Gas Volume Sampled (Vact) Am3 (w) Gas Volume Sampled (Vnw) Nm3 (w) Gas Volume Sampled (Vad) Am3 (d) Gas Volume Sampled (Vnd) Nm3 (d) Dust Concentration mg/am3 (w) Dust Concentration mg/nm3 (w) Dust Concentration mg/am3 (d) Dust Concentration mg/nm3 (d) Measured O2 % % % Correction factor 6% Correction factor 10% Dust Concentration Normalised to 6% O2 mg/nm3 6% O Dust Concentration Normalised to 10% O2 mg/nm3 10% O Outlet Dust Flowrate mg/s Moisture Concentration g/nm3 (d) Average Face velocity m/s Isokineticity % Average O/M Signal AO2 ma Measured Extinction SL Extinction Range AO2 Extinction Range AO1 Average O/M Signal AO1 ma Page 11 of 55

12 Gaseous Monitor correlation All SRM measurements were obtained from the most representative sampling point given in the Stratification report done in The ports were numbered in the sequence one would pass the ports when walking from the lift. One would encounter port A first up to port D. The most representative sampling point selected is at a depth of 6.5m from the inside of the wall of Traverse B. Traverse B is the second port from the stack lift. A schematic drawing of the sampling plane is shown below. A D Stack Lift B C Combustion gas compounds: The correlation functions were determined from the parallel measurements. The functions yield the emission in ppm or in percentage on a dry basis and at the AMS measured oxygen. It is the responsibility of Kriel Power Station to convert the AMS values (at actual measured O 2 conditions) to normalised conditions (given by the emissions license). This is done by using the AMS values for oxygen together with the formulas for each gas given in the Eskom Standard for Emission measurement and reporting. Page 12 of 55

13 The tables below give a summary of the correlation function constants and statistical parameters obtained from the QAL2 procedures. South Stack Station Kriel Stack/Unit Stack 2 Parameter CO₂ SO₂ NO O₂ ELV (%) 16 ELV (mg/nm3) Uncertainity (%) No of Tests Kv value SRM Max SRM Min Difference % of ELV Method A FALSE FALSE FALSE FALSE Method B TRUE TRUE TRUE TRUE Calibration Constants Method of Correlation Function B B B B m c Valid Calibration Range minimum maximum Variability Test Standard Deviation AMS Pass or Fail Test Fail Pass Pass Pass Uncertainity Data m c Uncertainity (±) Page 13 of 55

14 AMS readings during parallel measurements South Stack Load (MW) Unit Load (MW) Unit Load (MW) Unit South-SOx (ppm) S_NOx (ppm) S-CO2 (%) S-O2 (%) 04AP10W901- XQ01-OUT 05AP10W901- XQ01-OUT 06AP10W901- XQ01-OUT 05NR20A006- XQ01-OUT 05NR20A004- XQ01-OUT 05NR20A005- XQ01-OUT 05NR20A007- XQ01-OUT SUMMARY OF RESULTS 1. The O2, SO2 and NO2 of the AMS on the South Stacks pass the variability test. 2. The CO2 of the AMS on South Stack fails the variability test. 3. Twelve measurements at various loads showed particulate matter emission concentrations between 67.5 and mg/nm3 (d) at 10% O2 4. PM function as found for AO1 ( SL), y = *mA PM function as found for AO2 ( SL), y = *mA PM function recommended for AO1 (0 800 SL), y = *mA PM function recommended for AO2 ( SL), y = *ma Stack gas flow function for Unit 4, g = a Stack gas flow function for Unit 5, g = a Stack gas flow function for Unit 6, g = 2.264a RECOMMENDATIONS The recommended output range for AO1 should be SL and AO2 to be SL. The function for AO1 PM Emission is, y = *mA The function for AO2 PM Emission is, *ma The benefit of AO1 at this range is that the monitor will be more sensitive during normal operation. A more sensitive output will give early warning of any change in conditions. The SL range of AO2 at SL will be beneficial in such a way that when the plant experiences excursions beyond the AEL, the monitor will still respond up to 998.8mg/m 3. When repairs are done to the plant, the monitor will be able to indicate any improvement affected by the maintenance efforts. Page 14 of 55

15 Detailed information is given in the Appendices: Appendix A Plant parameters Appendix B Calibration function Appendix C Monitor calibration certificates Appendix D Reference gas and equipment calibration certificates Page 15 of 55

16 APPENDIX A Plant Parameters During Parallel measurements Page 16 of 55

17 During Gaseous Measurements Load (MW) Unit Load (MW) Unit Load (MW) Unit South-SOx (ppm) S_NOx (ppm) S-CO2 (%) S-O2 (%) 04AP10W901- XQ01-OUT 05AP10W901- XQ01-OUT 06AP10W901- XQ01-OUT 05NR20A006- XQ01-OUT 05NR20A004- XQ01-OUT 05NR20A005- XQ01-OUT 05NR20A007- XQ01-OUT Page 17 of 55

18 During Particulate Matter sampling Customer Kriel P/S Unit No. Unit 4, 5 & 6 Location SS Test No Stack tester: TL TL TL TL TL TL TL TL TL TL TL TL Date dd-mm-yy 2017/02/ /02/ /02/ /02/ /02/ /02/ /02/ /02/ /02/ /02/ /02/ /02/19 Start Time HH:mm:ss 10:21:00 14:07:00 13:36:00 15:18:00 16:57:00 09:23:00 10:59:00 13:49:00 15:39:00 14:44:00 10:25:00 12:01:00 End Time HH:mm:ss 11:37:00 15:22:00 14:48:00 16:29:00 18:07:00 10:34:00 12:15:00 15:04:00 16:54:00 16:01:00 11:36:00 13:12:00 Load (MW) Unit 4 04AP10W901-XQ01-OUT Load (MW) Unit 5 05AP10W901-XQ01-OUT Load (MW) Unit 6 06AP10W901-XQ01-OUT Total air flow (kg/s) Unit 4 04NG00F901-XQ01-OUT Total air flow (kg/s) Unit 5 05NG00F901-XQ01-OUT Total air flow (kg/s) Unit 6 06NG00F901-XQ01-OUT South (ma) Output 1 06NR20A015-XQ01-OUT South (ma) Output 1 06NR20A015-XQ04-OUT U4 ID ID (Amp) 04NR11D001-XQ01-out U5 LH ID (Amp) 05NR11D001-XQ01-out U6 ID ID (Amp) 06NR11D001-XQ01-out U4 RH ID (Amp) 04NR21D001-XQ01-out U5 RH ID (Amp) 05NR21D001-XQ01-out U6 RH ID (Amp) 06NR21D001-XQ01-out S-O2 (%) 05NR20A007-XQ01-OUT Page 18 of 55

19 APPENDIX B Calibration Function Page 19 of 55

20 South Stack Particulate Matter as found Page 20 of 55

21 KRIEL POWER STATION Emission Monitor Correlation Certificate Plant: Unit 4, 5 and 6 Location of monitor: South Stack Monitor information: Make of Monitor: Sick Model: SB100 Serial Numbers: Limits of validity: Lower limit mg/nm3 (d) [as an hourly average] Optical head: Upper limit mg/nm3 (d) [as an hourly average] MCU Hourly cycle checks are included in linear regression Operational data: Path length: Monitor range: N/A mm [Stack flange to Stack flange] 4-20 ma Analogue Output AO 1: SL Measuring Range: mg/nm 3 at 10 %O 2 Analogue Output AO 2: SL Measuring Range: mg/nm 3 at 10 %O 2 Dates: ma AEL Limit % O 2 Analogue Output Analogue Output AO 1: AO 2: Calibration date: 09-Feb Correlation dates: February Linear function: E AO1 = x Correlation coefficient(r) = 0.97 E AO2 = x where: E = Emission [mg/nm 3 (d)@ 10% O 2 ] x = Monitor output [ma] Emission [mg/nm 3 (d)] at 10 %O [ma] [%] Monitor output FIGURE 1 Prepared by: Inthuu Measurements Page 21 of 55

22 South Stack Air to gas flow curves Page 22 of 55

23 KRIEL POWER STATION Stack Gas Flow Correlation Certificate Plant: Unit 4 Location of monitor: South Stack Monitor information: Make of Monitor: Kriel DCS Model: N/A Serial Numbers: N/A N/A Limits of validity: Lower limit Nm 3 /s (d) at 10 %O 2 [as an hourly average] Upper limit Nm 3 /s (d) at 10 %O 2 [as an hourly average] Operational data: Stack internal diameter m Monitor range: N/A - Dates: Calibration date: N/A Correlation dates: February 2017 Linear function: g = a Correlation coefficient(r) = 0.14 where: g = Stack exit gas flow [Nm 3 /s (d) at 10 % O 2] a = Total air flow from DCS [kg/s] Gas Flow rate [Nm 3 /s(d)] at 10 %O Average Air flow [kg/s] FIGURE 2.1 Prepared by: Inthuu Measurements Page 23 of 55

24 KRIEL POWER STATION Stack Gas Flow Correlation Certificate Plant: Unit 5 Location of monitor: South Stack Monitor information: Make of Monitor: Kriel DCS Model: N/A Serial Numbers: N/A N/A Limits of validity: Lower limit Nm 3 /s (d) at 10 %O 2 [as an hourly average] Upper limit Nm 3 /s (d) at 10 %O 2 [as an hourly average] Operational data: Stack internal diameter m Monitor range: N/A - Dates: Calibration date: N/A Correlation dates: February 2017 Linear function: g = a Correlation coefficient(r) = 0.91 where: g = Stack exit gas flow [Nm 3 /s (d) at 10 % O 2] a = Total air flow from DCS [kg/s] Gas Flow rate [Nm 3 /s(d)] at 10 %O Average Air flow [kg/s] FIGURE 2.2 Prepared by: Inthuu Measurements Page 24 of 55

25 KRIEL POWER STATION Stack Gas Flow Correlation Certificate Plant: Unit 6 Location of monitor: South Stack Monitor information: Make of Monitor: Kriel DCS Model: N/A Serial Numbers: N/A N/A Limits of validity: Lower limit Nm 3 /s (d) at 10 %O 2 [as an hourly average] Upper limit Nm 3 /s (d) at 10 %O 2 [as an hourly average] Operational data: Stack internal diameter m Monitor range: N/A - Dates: Calibration date: N/A Correlation dates: February 2017 Linear function: g = 2.264a Correlation coefficient(r) = 0.84 where: g = Stack exit gas flow [Nm 3 /s (d) at 10 % O 2] a = Total air flow from DCS [kg/s] Gas Flow rate [Nm 3 /s(d)] at 10 %O Average Air flow [kg/s] FIGURE 2.3 Prepared by: Inthuu Measurements Page 25 of 55

26 South Stack Particulate Matter Recommended Page 26 of 55

27 KRIEL POWER STATION Emission Monitor Correlation Certificate Plant: Unit 4, 5 and 6 Location of monitor: South Stack Monitor information: Make of Monitor: Sick Model: SB100 Serial Numbers: Limits of validity: Lower limit mg/nm3 (d) [as an hourly average] Optical head: Upper limit mg/nm3 (d) [as an hourly average] MCU Hourly cycle checks are included in linear regression Operational data: Path length: Monitor range: N/A mm [Stack flange to Stack flange] 4-20 ma Analogue Output AO 1: SL Measuring Range: mg/nm 3 at 10 %O 2 Analogue Output AO 2: SL Measuring Range: mg/nm 3 at 10 %O 2 Dates: ma AEL Limit % O 2 Analogue Output Analogue Output AO 1: AO 2: Calibration date: 09-Feb Correlation dates: February Linear function: E AO2 = x Correlation coefficient(r) = 0.97 E AO3 = x where: E = Emission [mg/nm 3 (d)@ 10% O 2 ] x = Monitor output [ma] Emission [mg/nm 3 (d)] at 10 %O [ma] [%] Monitor output FIGURE 3 Prepared by: Inthuu Measurements Page 27 of 55

28 SRM Measured PPM South Stack SO 2 Method B Kriel PS Stack 2 Stack SO₂ Calibration Function (dry) Sample Number AMS PPM (dry) SRM PPM (dry) ,0 900,0 800,0 700,0 600,0 500,0 400,0 300,0 200,0 100,0 0,0 Kriel PS Stack 2 Stack SO₂ Calibration Function (dry) y = 1,177x R² = 0,958 0,0 100,0 200,0 300,0 400,0 500,0 600,0 700,0 800,0 900,0 AMS Measured PPM Page 28 of 55

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30 South Stack NO Method B Kriel PS Stack 2 Stack NO Calibration Function (dry) Sample Number AMS PPM (dry) SRM PPM (dry) Page 30 of 55

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32 South Stack CO Awaiting Plant Parameters Page 32 of 55

33 South Stack CO 2 Method B Kriel PS Stack 2 Stack CO₂ Calibration Function (dry) Sample Number AMS CO₂ % (dry) SRM CO₂ % (dry) Page 33 of 55

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35 South Stack O 2 Method B Kriel PS Stack 2 Stack O₂ Calibration Function (dry) Sample Number AMS % (wet) SRM % (wet) Page 35 of 55

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37 APPENDIX C Monitor Calibration certificates Page 37 of 55

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39 APPENDIX D Equipment Calibration Certificates Reference gases Reference equipment Page 39 of 55

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55 7 REVISIONS Revision Date Description No /03/10 Original document 8 DISTRIBUTION LIST S. Biyela Kriel Power Station CC Scheepers Inthuu Measurements CC Page 55 of 55