combustion Flashcards by eri mae | Brainscape

Q

needed o2 para maubos ang reactant

A

theo o2

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Q

O2 theo=

A

C+H/4 + S - O2

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Q

79/21

A

N2 supp/ N2 theo

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Q

unit process in w/c oxidation takes place

A

Combustion

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Q

combustion is always

A

exothermic

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Q

reactant of combustion

A

air + fuel

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Q

Case 1 is based on __ and solve starting w

A

fuel gas analysis; O2 theo

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Q

Case 2 is based on __ and solve starting w

A

flue gas analysis; use N2(SG) to solve for O2 theo

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Q

Case 3 is based on __ and solve starting w

A

partial analysis; O2 theo and let y=O2 s’s

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Q

basis for gaseous fuels

A

mol

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Q

solve for mol of H2O (SG)

A

mol of H/2

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Q

If 100% conv, O2 SG=

A

O2 x’s,

if x’s is 0 then no O2 in SG

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Q

Formula of O2 free
if conv =/= 100

A

O2 free = O2 x’s+ O2 unreacted

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Q

Formula of O2 unreacted

A

O2 unreacted= O2 theo(1-%conversion)

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Q

Formula of O2 free

if CO/ H2 is present

A

O2 free= x’s+CO/2 + H2/2

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Q

Hydrocarbon formula

A

Cn + H(2n+2)

Q

1st step in solving combustion of LIQUID fuel

A

convert mL to mol

Q

Octane no

A

vol octane/ (vol octane + vol heptane)

Q

Cetane no

A

vol cetane/ (vol cetane + vol methylnaphtalene)

Q

formula and density of CETANE

A

C16H34 , 0.7751 g/mL

Q

formula and density of METHYLNAPHTALENE

A

C11H10 , 1.025 g/mL

Q

formula of OCTANE

A

C8H18

Q

formula of HEPTANE

A

C7H16

Q

Latent heat of vaporization

A

44 kJ/mol

Q

Proximate Analysis

commonly solved by difference

A

FC

Q

Used to solve C_T

A

Calderwood eqn

Q

Proximate Analysis

A

M, V, F, A

Q

Modified Analysis

A

M, A, C_T, net H, N, S, CW

Q

Modified Analysis

commonly solved by difference

A

CW

Q

used to solve for Net H

A

Dulonga formula

Q

If N+S is < or = to 3, then____, since no ___ is formed

A

neglect, SO2

Q

Ultimate Analysis

A

C, H, O, N, A, S

Q

Analysis of VCM

A

C, net H, CW, N, S

Q

CV of FC

A

33.8 mJ/kg

Q

Formula of N2 SG If N2 supp =/= N2 SG then

A

N2 SG = N2 supp + (Nfuel/28)