Conventional fuels for ICEs

Question 1

What are the most common fuels for ICE?

Answer 1

Coal, petroleum,Natural gas, plants, animal fats, syntetic fuels(methanol and syntetic gas)

Question 2

When distilling and fractioning petroleum, each type of fuels have different fractions. What does this mean?

Answer 2

Fractioning happends at differnent levels. Each level has a minimum limit for amount of cabons in the carbon-chain. This is called fractioningl. F.eks. if the fraction number is 250 for one level. that meas that the petroium with 250 cabons stoped beeing a gas at that level exactly.

Question 3

What happends after fractioning?

Answer 3

Cracing. You crack open the longest carbon chains so that they can be used for for aircrafts, cars and so on

Question 4

How do you classify hydrocarbon structures?

Answer 4

By shape: straigth, branched and cyclic
By type of bond:saturated, double bond, triple bond and aromatics

Question 5

What is octane number?

Answer 5

Only otto cycle. Higher octane number = More compression before the fuel auto-ignites → prevents knocking

Question 6

What is cetane number?

Answer 6

How easely diesel ignite

Question 7

What is the purpose of surogats aka PRFs.

Answer 7

They represent fuels. As fuels have a lot of different c-chains, we usualy find surogats that act similar to your fuel when do tests. f.eks dodecane for diesel. PRF stands for primary refrence fuel.

Question 8

What is flash-point?

Answer 8

the minimum temperature at which vapor is released enough to start spontaneous ignition in the presence of air and an external heat source, such as a spark or a flame

Question 9

What are the two main categories of marine diesel fuels?

Answer 9

Distillate and residual. Distillate does literally just have a shorter carbon-chain whit all contains of properties.