Domestic and Multiple Dwelling Incinerators

Domestic incinerators are sized to handle a few pounds of solid waste per person per day. In single dwellings, a typical incinerator has about 40,000 Btu/hr of auxiliary heat capacity. Because domestic incinerators are less efficient than their municipal counterparts, the amount of auxiliary fuel used is high. The domestic incinerator in Figure 10.11.1 has two combustion chambers. The main purpose of the secondary chamber is to eliminate smoke and odor. As a result, the pollutant emissions from domestic incinerators are not excessive (see Table 10.11.6).

In multiple dwellings, the main purpose of incineration is to reduce the volume of the MSW prior to disposal. The refuse from a dwelling of 500 residents producing 2000 lb/day of MSW at a density of 4 lb/cu ft fills 100 trash cans. If incinerated onsite, the residue fits into 10 trash cans.

Incinerators in multiple dwellings can either be chute fed or flue fed. In the chute-fed design, waste is discharged into the chute and then into the incinerator feed hopper in the basement (see Figure 10.11.4). In the flue-fed design (see Figure 10.11.6), the chimney also serves as the charging chute for the waste, which falls onto grates above an ash pit inside a boxlike furnace. The main purpose of the charging door is to ignite the waste, while the purpose of the underfire and overfire air ports is to manually set the airflow for smokeless burning. The walls of the incinera-

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