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MSW COMBUSTION-GASIFICATION.docx

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MSW COMBUSTION-GASIFICATION.docx
MSW COMBUSTION-GASIFICATION
Heat Value of MSW
Ultimate Analysis (DuLong Eqn)
H(BTU/lb) = 145 C + 620 (H + O/8) + 40S
(Table 7-2)
Compositional Analysis
H(BTU/lb) = 49 w/oPlastics + 22.5 (w/oFood + w/oPaper) – 3.3 w/oWater
H(BTU/lb) = 1238 + 15.6 w/oPlastics + 4.4 w/o Paper + 2.7 w/o Food – 20.7 w/o Water
H(BUT/lb) = sum (H_i *f_i , I = 1..N)
(Tables 7-3, 7-4, 7-5)
Proximate Analysis
H(BTU/lb) = 800 f_Volatiles + 14,500 f_C
(Table 7-6)
Calorimetry:
H(BTU/lb) = Cp_calorimeter DT/M
Higher and Lower Heating Values
Material and Energy Balances
Basics of Combustion
Combustion of pure Carbon C + O2  CO2 + 32,800 J/g
Stoichiometry of Combustion Reactions
Energy Balance
Rate of Energy IN = Rate of Energy USED + rate of Energy WASTED
Combustion Efficiency E = Energy USED/Energy IN
Carnot Efficiency E_C = (T_boiler – T_condenser)/T_boiler
Detailed Energy Balance in a Waste to Energy Unit (Fig. 7-5)
Hardware
Incinerators
Moving Grate and Rotary Kiln Combustors (Figs. 7-6, 7-7, 7-8, 7-9), 7-11, 7-12
Excess Air (Fig. 7-10)
Steam Generator Tubes – Hot Corrosion performance
Modular Starved-Air Combustors (No heat recovery)
Pyrolysis and Gasification
Plasma Gasification
Mass Burn vs Refuse Derived Fuel (RDF) Systems
Types of RDF (Tables 7-9, 7-10, 7-11)
Environmental Impact
Waste Heat (Post-turbine Steam ; Hot Water discharges)
Ash Pollutants (Bottom and Fly) (Tables 7-12, 7-13)
Air Pollutants
Dioxins
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