1

Feeder

Secondary chamber

To gas analyzers

Heat source

Stack

EPA method 23 sampling train

Computer based temperature measurement

Figure 15.11. Schematic diagram of laboratory-scale thermal destruction facility.

Stack

EPA method 23 sampling train

Computer based temperature measurement

Figure 15.11. Schematic diagram of laboratory-scale thermal destruction facility.

heat transfer to the surroundings. A rotary feeder driven by an electric motor achieves continuous feeding. The fly ash and product gases leave through an exhaust pipe while the bottom ash is removed through the ash and slag pipe located at the bottom of the chamber. Gas-sampling and temperature-measuring ports are provided on the side and exit of the TDF for continuous monitoring and measurement of operating parameters. The TDF has all the necessary provisions to study the effect of operating parameters, such as fuel type and size, feed rate, excess air, residence time, and temperature on thermal destruction and products formation.

The combustion air and fuel gas flow to the gas burner were measured with flow meters. The flow rates were corrected for temperature and pressure pertaining to experimental conditions. The waste feed rate is calculated from the speed of the feeder motor. Two digital temperature indicators are used for continuously monitoring the temperatures in the furnace and exhaust duct, respectively. The furnace temperature is measured using a type R [Pt-Pt/13% Rhodium] thermocouple of wire size 0.01 inch while the exhaust gas temperature is measured using a type K (Cr-Al) thermocouple having 0.025 inch wires diameter. A microprocessor-based data acquisition and analysis system was used to measure the instantaneous and time-averaged temperature in the combustion chamber and exhaust duct.

Experiments were designed to study the effect of varying plastic and nonplas-tic fractions in the waste on emission characteristics. Seven different samples were examined, with chemical compositions of the nonplastic and plastic materials and their heating values being given in Table 15.8. The overall chemical

Table 15.8 Composition of Examined Nonplastic and Plastic Samples

Sample

Nonplastic

Plastic

No.

(% volume)

(% volume)

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