combustion Flashcards
needed o2 para maubos ang reactant
theo o2
O2 theo=
C+H/4 + S - O2
79/21
N2 supp/ N2 theo
unit process in w/c oxidation takes place
Combustion
combustion is always
exothermic
reactant of combustion
air + fuel
Case 1 is based on __ and solve starting w
fuel gas analysis; O2 theo
Case 2 is based on __ and solve starting w
flue gas analysis; use N2(SG) to solve for O2 theo
Case 3 is based on __ and solve starting w
partial analysis; O2 theo and let y=O2 s’s
basis for gaseous fuels
mol
solve for mol of H2O (SG)
mol of H/2
If 100% conv, O2 SG=
O2 x’s,
if x’s is 0 then no O2 in SG
Formula of O2 free
if conv =/= 100
O2 free = O2 x’s+ O2 unreacted
Formula of O2 unreacted
O2 unreacted= O2 theo(1-%conversion)
Formula of O2 free
if CO/ H2 is present
O2 free= x’s+CO/2 + H2/2
Hydrocarbon formula
Cn + H(2n+2)
1st step in solving combustion of LIQUID fuel
convert mL to mol
Octane no
vol octane/ (vol octane + vol heptane)
Cetane no
vol cetane/ (vol cetane + vol methylnaphtalene)
formula and density of CETANE
C16H34 , 0.7751 g/mL
formula and density of METHYLNAPHTALENE
C11H10 , 1.025 g/mL
formula of OCTANE
C8H18
formula of HEPTANE
C7H16
Latent heat of vaporization
44 kJ/mol
Proximate Analysis
commonly solved by difference
FC
Used to solve C_T
Calderwood eqn
Proximate Analysis
M, V, F, A
Modified Analysis
M, A, C_T, net H, N, S, CW
Modified Analysis
commonly solved by difference
CW
used to solve for Net H
Dulonga formula
If N+S is < or = to 3, then____, since no ___ is formed
neglect, SO2
Ultimate Analysis
C, H, O, N, A, S
Analysis of VCM
C, net H, CW, N, S
CV of FC
33.8 mJ/kg
Formula of N2 SG If N2 supp =/= N2 SG then
N2 SG = N2 supp + (Nfuel/28)
