On 6 March 2003, sampling was carried out at Site C. Samples were collected from the induction furnace baghouse discharge to determine the concentration and mass emission of PCDD and PCDF present in the gases discharged to the atmosphere.
5.1 Introduction
The sampling point was after the baghouse in a vertical section of duct and at least three duct diameters from any disturbance to the flow. The sampling point was accessed from scaffolding.
Details of the sampling date, times and stack dimensions are:
- Sample date and time:
- Sample 1: 6 March 2003, 3:40-16:42
- Sample 2: 6 March 2003, 17:23-20:23
- Stack dimensions: 0.91 x 0.9 metre rectangular duct.
5.2 Results
Table 5.1: Particulate emissions from induction furnace
| Sample | Sample mass (g) | Particulate emissions | |
|---|---|---|---|
| (mg/m3, dry, 0°C, 1 Atm) | (kg/h) | ||
| 1 | 0.001 | <0.6 | <0.02 |
| 2 | 0.001 | <0.6 | <0.02 |
| Average | <0.6 | <0.02 | |
Note: The sample mass was less than the limit of detection.
Table 5.2: Average stack gas conditions at the induction furnace sampling point
| CO2 | Temperature(°C) | Moisture(%) | Velocity(m/s) | Flow rate | ||
|---|---|---|---|---|---|---|
| (%, wet) | (%, dry) | (m3/s) | (m3/s, 0°C, 1 Atm, dry) | |||
| < 0.5 | < 0.5 | 37.3 | 1.8 | 13.7 | 11.3 | 9.73 |
Table 5.3: Results of isokinicity for induction furnace
| Sample | Actual sample volume (m3, 0°C, 1 Atm, dry) | Calculated sample volume (m3, 0°C, 1 Atm, dry) | Isokinicity (%) |
|---|---|---|---|
| 1 | 1.6490 | 1.6434 | 100% |
| 2 | 1.6542 | 1.5787 | 105% |
All samples are within the required isokinicity range of 100 ± 10%.
Table 5.4: Average combustion gas results
| CO (mg/m3) | SO2 (mg/m3) | NO (mg/m3) | O2 (%) | NO2 (mg/m3) |
|---|---|---|---|---|
| 11.6 | <25 | 8.3 | 21.1 | 1.4 |
Table 5.5: Summary results from induction furnace sample 1 filter, rinses and trap
| Concentration (ng/m3) | Emission (ng/hr) | Emission (ng/tonne) | ||
|---|---|---|---|---|
| Sum of PCDD and PCDF congeners | Excluding LOD values | 0.103 | 3,650 | 1,622 |
| Including half LOD values | 0.498 | 17,567 | 7,808 | |
| Including LOD values | 0.892 | 31,484 | 13,993 | |
| Total I-TEQ | Excluding LOD values | 0.000236 | 8.34 | 3.71 |
| Including half LOD values | 0.00191 | 67.4 | 30.0 | |
| Including LOD values | 0.00358 | 126.5 | 56.2 | |
| Total WHO-TEQ | Excluding LOD values | 0.000231 | 8.16 | 3.62 |
| Including half LOD values | 0.00177 | 62.4 | 27.7 | |
| Including LOD values | 0.00331 | 117 | 51.9 |
Table 5.6: Results from induction furnace (individual congeners sample 1 filter, rinses and trap)
Table 5.7: Summary results from induction furnace sample 2 filter, rinses and trap
| Concentration (ng/m3) | Emission (ng/hr) | Emission (ng/tonne) | ||
|---|---|---|---|---|
| Sum of PCDD and PCDF congeners | Excluding LOD values | 2.67 | 91,752 | 40,778 |
| Including half LOD values | 2.67 | 91,752 | 40,778 | |
| Including LOD values | 2.67 | 91,752 | 40,778 | |
| Total I-TEQ | Excluding LOD values | 0.006 | 195 | 86.6 |
| Including half LOD values | 0.009 | 304 | 135 | |
| Including LOD values | 0.012 | 412 | 183 | |
| Total WHO-TEQ | Excluding LOD values | 0.004 | 132 | 58.6 |
| Including half LOD values | 0.007 | 251 | 111 | |
| Including LOD values | 0.011 | 370 | 164 |
Table 5.8: Results from induction furnace (individual congeners sample 2 filter, rinses and trap)
See more on...
5 Site C
April 2004
© Ministry for the Environment