Cochin laboratory


CALORIFIC VALUE (GCV &NCV)



Download 53,1 Kb.
bet8/34
Sana29.12.2021
Hajmi53,1 Kb.
#77096
1   ...   4   5   6   7   8   9   10   11   ...   34
Bog'liq
ClassificationSignificanceofTestMethodsofPetroleumProducts

CALORIFIC VALUE (GCV &NCV)

By Bomb (P 6, D 240, IP 12)

By calculation (P 7, D 4868)

Provides information on heat producing capacity of the fuel. The heat of combustion is a direct measure of fuel energy content and is determined as the quantity of heat liberated by the combustion of a unit quantity of fuel with oxygen in a standard bomb calorimeter. A high calorific value is obviously desirable in oil used for heating purposes. The calorific value of residual fuel oil is lower than that of lower-boiling fuel oil because of the lower atomic hydrogen-to-carbon ratio and the incidence of greater amounts of less combustible material, such as water and sediment, and generally higher levels of sulfur. The empirical calculation is based on the correlation between heat of combustion and density, sulfur, water, and ash content of the fuel sample.



GCV: It is the quantity of heat liberated when a unit mass of fuel is burned in oxygen at constant volume, the products of combustion being Carbon dioxide, Nitrogen, Sulphur- dioxide and water.

NCV: It is the quantity of heat liberated when unit mass of fuel is burned in oxygen, the products of combustion being carbon-dioxide and Nitrogen. This value may be expressed either at constant pressure or constant volume.

CALCULATION
Qv = 12400 – 2100 d2, ( Qv = Gross Calorific Value, cal/gm & d = Density at 15 deg. C)
Q p = qv – H(WL –C)

H = Hydrogen content , H = 26 -15 d, d = Specific gravity of the sample

W = No of grams of water formed per gram of Hydrogen (Equal to 9), L = latent Heat of vaporization of water (=Equal to 585), C = Correction factor for change in volume from initial to final products. (Equal to 220)
HEAT OF COMBUSTION OF FUEL CORRECTED FOR SULPHUR, WATER AND ASH CONTENT
Qv (Gross) = qv-0.01qv(W+A+S) + X(S)

Qp (Net) = qp-0.1qp(W+A+S) =X(S) - Y(W)

(X = 22.5 when Q is expressed in cal/gm, Y = 5.85 when Q is expressed in cal/gm)
CARBON RESIDUE (CCR, RCR & MICRO METHOD)

The carbon residue value of burner fuel serves as a rough approximation of the tendency of the fuel to form deposits in vaporizing pot- and sleeve-type burners. Similarly, provided alkyl nitrates are absent, the carbon residue of the diesel fuel correlates approximately with combustion chamber deposits. The carbon residue value of motor oils, while once considered useful, is now considered to be of doubtful value because of the presence of additives in many oils. The carbon residue of gas oil is useful as a guide in the manufacture of gas from gas oil and residue value of crude oil residuums, cylinder and bright stocks, are useful in the manufacture of lubricants.




Download 53,1 Kb.

Do'stlaringiz bilan baham:
1   ...   4   5   6   7   8   9   10   11   ...   34




Ma'lumotlar bazasi mualliflik huquqi bilan himoyalangan ©hozir.org 2024
ma'muriyatiga murojaat qiling

kiriting | ro'yxatdan o'tish
    Bosh sahifa
юртда тантана
Боғда битган
Бугун юртда
Эшитганлар жилманглар
Эшитмадим деманглар
битган бодомлар
Yangiariq tumani
qitish marakazi
Raqamli texnologiyalar
ilishida muhokamadan
tasdiqqa tavsiya
tavsiya etilgan
iqtisodiyot kafedrasi
steiermarkischen landesregierung
asarlaringizni yuboring
o'zingizning asarlaringizni
Iltimos faqat
faqat o'zingizning
steierm rkischen
landesregierung fachabteilung
rkischen landesregierung
hamshira loyihasi
loyihasi mavsum
faolyatining oqibatlari
asosiy adabiyotlar
fakulteti ahborot
ahborot havfsizligi
havfsizligi kafedrasi
fanidan bo’yicha
fakulteti iqtisodiyot
boshqaruv fakulteti
chiqarishda boshqaruv
ishlab chiqarishda
iqtisodiyot fakultet
multiservis tarmoqlari
fanidan asosiy
Uzbek fanidan
mavzulari potok
asosidagi multiservis
'aliyyil a'ziym
billahil 'aliyyil
illaa billahil
quvvata illaa
falah' deganida
Kompyuter savodxonligi
bo’yicha mustaqil
'alal falah'
Hayya 'alal
'alas soloh
Hayya 'alas
mavsum boyicha


yuklab olish