Sampling was carried out at Site F on 18 March 2003. 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.
8.1 Introduction
The sampling point was on the main stack after a bag house. The sample port was at least five diameters from a disturbance to the flow.
Details of the sampling date, times and stack dimensions are:
- Sample date and time:
- Sample 1: 18 March 2003, 10:03-14:02
- Sample 2: 18 March 2003, 14:59-19:00
- Stack dimensions: 1.5 metre diameter circular duct.
Flows were measured the day before sampling. On the day of sampling the flows had changed significantly. The flow rate was measured while the samples were being gathered and if there was any change the sample rate was adjusted accordingly. At the end of sampling flows were measured across the entire diameter of the stack.
8.2 Results
Table 8.1: Particulate emissions from induction furnace
| Sample | Sample mass (g) | Particulate emissions | |
|---|---|---|---|
| (mg/m3, dry, 0°C, 1 Atm) | (kg/h) | ||
| 1 | 0.0297 | 7.2 | 0.494 |
| 2 | < 0.0155 | < 4.2 | < 0.259 |
Table 8.2: Average stack gas conditions at the induction furnace sampling point
| CO2 | Temperature(°C) | Moisture(%) | Velocity(m/s) | Flow fate | ||
|---|---|---|---|---|---|---|
| (%, wet) | (%, dry) | (m3/s) | (m3/s, 0°C, 1 Atm, dry) | |||
| <0.5 | <0.5 | 73.9 | 2.3 | 12.2 | 21.6 | 16.6 |
Table 8.3: 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 | 4.1198 | 4.3630 | 94 |
| 2 | 3.6999 | 3.9731 | 93 |
All samples are within the required isokinicity range of 100 ± 10%.
Table 8.4: 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 | 4.72 | 282,958 | 232,204 |
| Including half LOD values | 4.76 | 285,139 | 233,994 | |
| Including LOD values | 4.80 | 287,321 | 235,784 | |
| Total I-TEQ | Excluding LOD values | 0.100 | 6017 | 4938 |
| Including half LOD values | 0.101 | 6026 | 4945 | |
| Including LOD values | 0.101 | 6036 | 4953 | |
| Total WHO-TEQ | Excluding LOD values | 0.110 | 6605 | 5421 |
| Including half LOD values | 0.110 | 6613 | 5427 | |
| Including LOD values | 0.111 | 6620 | 5433 |
Table 8.5: Results from induction furnace (individual congeners sample 1 filter, rinses and trap)
Table 8.6: 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 | 24.1 | 1,446,089 | 734,133 |
| Including half LOD values | 24.2 | 1,448,518 | 735,366 | |
| Including LOD values | 24.2 | 1,450,946 | 736,599 | |
| Total I-TEQ | Excluding LOD values | 0.567 | 33,969 | 17,245 |
| Including half LOD values | 0.567 | 33,971 | 17,246 | |
| Including LOD values | 0.567 | 33,974 | 17,247 | |
| Total WHO-TEQ | Excluding LOD values | 0.614 | 36,801 | 18,683 |
| Including half LOD values | 0.614 | 36,802 | 18,683 | |
| Including LOD values | 0.614 | 36,802 | 18,683 |
Table 8.7: Results from induction furnace (individual congeners sample 2 filter, rinses and trap)
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8 Site F
April 2004
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