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Figure 6-3. NOx emissions while burning TDF or tires at 'coal-fired electric utilities.

On day 4 (15X TOF) Ohio Edison experienced tire feed supply problem that resulted In several Interruptions of tlra supply to the boiler.

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1 Coal/Tire Blend | Coal Only

1 Coal/Tire Blend | Coal Only

Figure 6-4. Trace metal emission rates when burning waste tires compared to coal.18

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Figure 6-4. Trace metal emission rates when burning waste tires compared to coal.18

Kote: Tick mark indicates average emission rate; bar shows +/-2 standard deviation range in data. Bars are truncated at zero.

Figure 6-5. Trace metal emission rate changes when burning waste tires compared to coal. 8

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0.002

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Figure 6-5. Trace metal emission rate changes when burning waste tires compared to coal. 8

Note: Positive change indicates an emission increase when burning tires blended with coal as compared to coal only. Tick mark (►) indicates average measured change; bar shows +/-2 standard deviation range in data. Tick mark («) indicates estimated emission change based on fuel analyses.

HF emissions were reduced.18 Reasons for this reduction were unknown.18 WP&L reported that dioxin and furan emission rates were small, and the change over baseline in all cases was statistically insignificant.' Figure 6-6 graphs emission rates of several dioxin and furan compounds at WP&L and Figure 6-7 graphs the change in emission rate for dioxin and furan compounds. Polycyclic organic matter and PCB's were measured at WP&L, but were not detected during any test runs.18

6.3.7 Control Equipment Issues

Weekend shutdown maintenance at WP&L has shown some unusual deposits on the ESP plates and wires, but the deposits are soft and easily removed.18

United Power Association experienced good fabric filter operation when burning up to 10 percent TDF. However, when the facility tested TDF levels up to 65 percent, operation of the fabric filter was of primary concern. The ash from the rubber was significantly more difficult to cleanoff the bags than the coal ash. The resultant ash build up on the bags caused an increased pressure drop across the system from 3" to 6". Personnel operated the cleaning cycle continuously, and operated both reverse air fans for the duration of the test, which improved the situation.17

The Northern States Power facility experienced significant operational problems with their electrolyzed pebble bed scrubber during tests burning from 7 to 9 percent TDF (mixed with woodwaste) in a retrofitted fluidized combustion bed boiler. The electrostatic voltage dropped to near zero on several occasions; on others, the collection efficiency declined continually. Several reasons for this are suggested. First, the ash during the test was more cohesive

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| Coal/Tire Blend Coal Only

Trash To Cash

Trash To Cash

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