Sampling was carried out at Site E on 17 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.
7.1 Introduction
The sampling point was in a vertical section of duct. Access was difficult and limited which prevented doing a full traverse of the stack.
Details of the sampling date, times and stack dimensions are:
- Sample date and time: 17 March 2003, 13:55-18:05
- Stack dimensions: 0.5 metre diameter circular duct.
7.2 Results
Table 7.1: Particulate emission from induction furnace
| Sample | Sample mass(g) | Particulate emissions | ||
|---|---|---|---|---|
| (mg/m3, dry, 0°C, 1 Atm) | (mg/m3, dry, 0 °C, 1 Atm, 12% CO2) | (kg/h) | ||
| 1 | 0.0188 | 5.2 | 44.7 | 0.02 |
Table 7.2: 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) | |||
| 1.3 | 1.4 | 41.6 | 5.4 | 6.6 | 1.3 | 1.1 |
Table 7.3: 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 | 3.605 | 3.8389 | 93.9% |
All samples are within the required isokinicity range of 100 ± 10 %.
Table 7.4: Combustion gas results
| CO (mg/m3) | SO2 (mg/m3) | NO (mg/m3) | O2 (%) | NO2 (mg/m3) |
|---|---|---|---|---|
| 7.5 | < 25 | 23 | 19.6 | 3.8 |
The weight of scrap metal melted during the sampling period was 6.319 tonnes.
Table 7.5: Summary results from induction furnace sample 1 filters, rinses and trap
| Concentration (ng/m3) | Concentration (ng/m3 11% O2) | Emission ng/hr | Emission ng/tonne | ||
|---|---|---|---|---|---|
| Sum of PCDD and PCDF congeners | Excluding LOD values | 0.0127 | 0.093 | 48 | 31.3 |
| Including half LOD values | 0.046 | 0.337 | 174 | 113 | |
| Including LOD values | 0.079 | 0.58 | 300 | 194 | |
| Total I-TEQ | Excluding LOD values | 0.00007 | 0.0005 | 0.25 | 0.164 |
| Including half LOD values | 0.00111 | 0.0082 | 4.2 | 2.74 | |
| Including LOD values | 0.00215 | 0.0159 | 8.2 | 5.31 | |
| Total WHO-TEQ | Excluding LOD values | 0.00007 | 0.0005 | 0.25 | 0.164 |
| Including half LOD values | 0.00123 | 0.0091 | 4.7 | 3.04 | |
| Including LOD values | 0.00240 | 0.0177 | 9.2 | 5.92 |
Table 7.6: Results from induction furnace (individual congeners sample 1 filters, rinses and trap)
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7 Site E
April 2004
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