Teoriya na Kwalba Kula
An zama wata kimya mai karkashin kisan kai da oxygen. Idan abubuwa na kisan kai ta haɗa da O2, ya shafi hoton energy. A lokacin karkashin kai, abubuwan da ake iya karkasha kamar Carbon, Sulfur, Hydrogen, suna haɗa da oxygen kuma sun samun oxide daban-daban. Mafarin oxygen a karkashin kai shine hawa. A hawan hawa akwai 21% oxygen (kafin volume) da 23.2% (kafin miyaga). Akwai 79% (kafin volume) nitrogen a hawa amma ba yana rawa a karkashin kai.
Amma Nitrogen tana gina hoton da aka shafi a lokacin karkashin kai zuwa steam boiler stack. Kafin a yi amfani da karkashin kai za a iya samun mafi hawa da ke sahiya O2 don in karkasha abubuwan da ake iya karkasha kisan kai. Wannan mafi hawa ana sanin STOICHIOMETRIC AIR requirement.
Wannan mafi hawa ta nufin cewa idan an yi amfani da kisan kai. STOICHIOMETRIC AIR requirements for different fuels are obtained by analysis of fuel and they are given in tabular form below,
Kisan Kai |
STOICHIOMETRIC AIR mass / unit mass of fuel |
Bituminous Coal |
11.18 |
Anttiasite Coal |
10.7 |
Coke |
9.8 |
Liquite |
7.5 |
Peat |
5.7 |
Residual Fuel Oil |
13.85 |
Distillate Fuel Oil(Gas Oil) |
14.48 |
Natural Gas(Methane Base) |
17.3 |
Karkashin Kai
Don hawa masu daidai,
Sun ce ne a matsayin miyaga akwai 23.2 % O2 a hawa. Saboda haka, mafi hawa da ke buƙaci 2.67 gm O2 shine
Kafin a yi amfani da ideal combustion theory, bayan karkashin 1 gm carbon (C), product of combustion contains only 3.67 gm CO2 and
of N2.
Karkashin Kai Don Hawa Masu Daidai
A miyaga, mafi hawa da ke buƙaci wannan O2 shine
Bayan karkashin 1 gm carbon(C), product of combustion contains only 2.33 gm of CO and
of N2.
Daga equation (1) and (2) it is clear that due to insufficient air combustion, the heat lose during 1 gm of coal combustion is
.
Karkashin Sulfur
Saboda haka, hawa da ke buƙaci 1 gm sulfur combustion, is
Saboda haka, product of combustion, after completing 1 gm of sulfur combustion, contains 2 gm of SO2 and
