Sampling was carried out at Site D on 12 and 13 March 2003. Samples were collected from the induction furnace discharge to determine the concentration and mass emission of PCDD and PCDF present in the gases discharged to the atmosphere.
6.1 Introduction
The sampling point was located in a custom built duct, which was attached to the end of the stack. 100% of the discharge from the main stack passed through this duct.
Details of the sampling date, times and stack dimensions are:
- Sample date and time:
- Sample 1: 12 March 2003, 14:51-15:55 and 13 March 2003, 09:50-12:37
- Sample 2: 13 March 2003, 13:00-15:55
- Stack dimensions: 218 x 261 mm rectangular duct.
Note: Test 1 was stopped on 12 March and restarted on 13 March.
6.2 Results
Table 6.1: Particulate emissions from induction furnace
| Sample | Sample mass (g) | Particulate emissions | |
|---|---|---|---|
| (mg/m3, dry, 0°C, 1 Atm) | (kg/h) | ||
| 1 | 0.0214 | 4.1 | 0.0073 |
| 2 | 0.0079 | 2.0 | 0.0038 |
| Average | 3.0 | 0.0055 | |
Table 6.2: Average stack gas conditions at the bag house 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 | 33.0 | 1.2 | 12.0 | 0.68 | 0.60 |
Table 6.3: Average conditions for stack
| CO2 | Temperature(°C) | Moisture(%) | Velocity(m/s) | Flow rate | ||
|---|---|---|---|---|---|---|
| (%, wet) | (%, dry) | (m3/s) | (m3/s, 0°C, 1 Atm, dry) | |||
| < 0.5 | < 0.5 | 30.0 | 1.2 | 9.7 | 0.55 | 0.49 |
Note: The sample was only taken at one point and did not represent the true flows of the stack. Accurate flows were taken after this sample and used in all particulate and dioxin/furan calculations.
Table 6.4: 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 | 5.1733 | 5.5539 | 93% |
| 2 | 4.0615 | 4.0779 | 100% |
All samples are within the required isokinicity range of 100 ± 10%.
Table 6.5: Average combustion gas results
| CO (mg/m3) | SO2 (mg/m3) | NO (mg/m3) | O2 (%) | NO2 (mg/m3) |
|---|---|---|---|---|
| 0.22 | <25 | 1.5 | 21.0 | <9 |
Table 6.6: Summary results from induction furnace sample 1
| Concentration (ng/m3) | Emission (ng/hr) | Emission (ng/tonne) | ||
|---|---|---|---|---|
| Sum of PCDD and PCDF congeners | Excluding LOD values | 0.0323 | 57.4 | 129 |
| Including half LOD values | 0.0503 | 89.5 | 201 | |
| Including LOD values | 0.0684 | 122 | 273 | |
| Total I-TEQ | Excluding LOD values | 0.00011 | 0.217 | 0.49 |
| Including half LOD values | 0.00132 | 2.37 | 5.3 | |
| Including LOD values | 0.00253 | 4.53 | 10.2 | |
| Total WHO-TEQ | Excluding LOD values | 0.00010 | 0.200 | 0.45 |
| Including half LOD values | 0.00140 | 2.51 | 5.6 | |
| Including LOD values | 0.00270 | 4.82 | 10.8 |
Table 6.7: Results from induction furnace (individual congeners sample 1)
View results from induction furnace (individual congeners sample 1) (large table)
Table 6.8: Summary results from induction furnace sample 2
| Concentration (ng/m3) | Emission (ng/hr) | Emission (ng/tonne) | ||
|---|---|---|---|---|
| Sum of PCDD and PCDF congeners | Excluding LOD values | 0.0139 | 24.7 | 145 |
| Including half LOD values | 0.0508 | 90.4 | 531 | |
| Including LOD values | 0.0878 | 156 | 916 | |
| Total I-TEQ | Excluding LOD values | 0.00004 | 0.0337 | 0.198 |
| Including half LOD values | 0.00160 | 2.81 | 16.5 | |
| Including LOD values | 0.00316 | 5.58 | 32.8 | |
| Total WHO-TEQ | Excluding LOD values | 0.000037 | 0.0337 | 0.198 |
| Including half LOD values | 0.00177 | 3.11 | 18.3 | |
| Including LOD values | 0.00350 | 6.19 | 36.4 |
Table 6.9: Results from induction furnace (individual congeners sample 2)
View results from induction furnace (individual congeners sample 2) (large table)
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6 Site D
April 2004
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