Refuse modular

Types of Combustors The three main classes of facilities used to combust municipal refuse are mass burn, modular, and RDF-fired facilities. Mass-burn combustors are field erected and generally range in size from 50 to 1000 tons/day of refuse feed per unit (Fig. 25-64). Modular combustors burn waste with little more pre-... 

All = all combustors MB = mass burn combustors RDF = refuse-derived fuel combustors MSA = modular-starved air combustors. 

The two leading methods of generating energy from the incineration of municipal solid waste (MSW) are the mass-bum system and the refuse derived fuel (RDF) system. The mass-burn system incinerates unprocessed MSW to recover energy and the RDF system processes unprocessed MSW into a usable fuel prior to incineration. Both methods use either starved-air modular, stoker grates, rotary kiln, or fluidized-bed units for incineration. While the mass-burn system is currently more widely utilized, both systems may be used for large waste capacities. 

At the time of the study, most of the installations in the United States burning municipal refuse in modular incinerators had been operating for only a few years or less. Most installations did not have heat recovery. It is difficult to analyze a technology with so little operating experience. It is impossible to determine unit lifetimes and maintenance requirements because no unit has operated for much of its expected lifetime. 

The economics of modular incinerators was developed for a hypothetical location burning refuse typical of Naval installations. The modular units were assumed to be typical two-stage combustion devices. It was assumed that some source separation would be practiced to remove most of the glass and bulky items. 

COSTS OF SMALL MODULAR REFUSE INCINERATION SYSTEM Design capacity is 18.2 metric ton/day (20 ton/day)... 

ESTIMATED INVESTMENT COSTS FOR LARGE MODULAR REFUSE INCINERATION SYSTEMS WITH HEAT RECOVERY... 

COST OF LARGE MODULAR REFUSE INCINERATOR SYSTEMS... 

Figure 3. Economics of operating large modular refuse incinerators with heat recovery and particulate control...

Air-pollution control devices are widely but not universally used as follows Of 69 mass-bum rrrrits, 51 liave SDAs (spray dryer absorbers or scrabbers), 1 has a WS (wet scmbber), 0 have a C (cyclone), 9 have Lis (lime injection), 49 FFs (fabric Alters), 22 ESPs (elecAostatic precipitators), 25 SNCRs (selecAve noncatalytic reduction forNOx conAol), and28 CIs (activated carbon injections) of 13 modular systems, 2 have SDAs, 3 WSs, 1 has a C, 2 have Lis, 3 FFs, 7 ESPs, none has an SNCR, and 2 have CIs of 13 RDFs (refuse-derived-fuel) facilities... 

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