Answered: How the presence of N2 in air does…

How the presence of N2 in air does affects the outcome of a combustion process. What does the dew point temperature of the product gases represent? How it is determined?

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter32: Oil Heat

Section: Chapter Questions

Problem 12RQ: When incomplete combustion occurs, what additional by-products of combustion are created?

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.

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Question No.13: How the presence of N2 in air does affects the outcome of a combustion process. What does the dew point temperature of the product gases represent? How it is determined?

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Question No.14: A certain natural gas has following volumetric analysis: 65 percent CH4, 8 percent H2, 18 percent N2, 3 percent O2, and 6 percent CO2. This gas is now burnt completely with the stoichiometric amount of dry air. What is the air-fuel ratio for this combustion process?
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C,Hs is burned in an engine with a fuel-rich air-fuel ratio. Dry analysis of the exhaust gives the following volume percents: CO, 14.95%, C,H, 0.75%, CO 0%. H = 0%, O, 0%, with the rest being N. Higher heating value of this fuel is Quav 46.9 MJ/kg. Write the balanced chemical equation for one mole of this fuel at these conditions Calculate: (a) Air-fuel ratio. (b) Equivalence ratio. (c) Lower heating value of fuel. [MJ/kg] (d) Energy released when one kg of this fuel is burned in the engine with a combustion efficiency of 98%. [MJ]
Do not give answer in image formet and hand writing
Propane is burned with dry air. A volumetric analysis of the products of combustionreveals the following volume percent composition on a dry basis, 8% CO2, 0.5% CO,7% O2, and 84% N2. Determine the percent of theoretical air used in the combustionprocess.
C4Hs is burned in an engine with a fuel-rich air-fuel ratio. Dry analysis of the exhaust gives the following volume percents: CO2 = 14.95%, C4H8 0.75%, CO = 0%, H2 = 0%, O2 = 0%, with the rest being N2. Higher heating value of this fuel is QHHV = 46.9 MJ/kg. Write the balanced chemical equation for one mole of this fuel at these conditions. Calculate; a) Air-fuel ratio. b) Equivalence ratio. c) Lower heating value of fuel. [MJ/kg] d) Energy released when one kg of this fuel is burned in the engine with a combustion efficiency of 98%. [MJ]
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Question No.15: Ethane C2H6 is burned with 20% excess air during a combustion process. Assuming complete combustion and a total pressure of 100 kpa, determine air-fuel ratio, dew point temperature of the product.
9. Adiabatic Flame Temperature is achieved when (a) the combustion heat is the maximum (c) the combustion heat is the minimum (b) there is no loss in the heat to the surroundings (d) all products are at the same temperature has the most affinity to water to form sulfuric acid. (b) SO₂ (d) SO 10. Among all sulfur compounds, (a) SO3 (c) SO4² 11. When comparing the performance of SI engines, the (a) Indicated -efficiency is used as the measure. (b) Thermal (d) volumetric (c) mechanical 12. For a complete combustion, the reaction time should be longer than the physical time. (a) True (b) False
Q5: Calculate the equivalence ratio and the mole fractions of the products of the complete combustion of isooctane (CaHis) with 200% theoretical air.
This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Ethane (C2H6) is burned with 20 percent excess air during a combustion process. Assume complete combustion and a total pressure of 180 kPa. Use data from the tables. CH. Combustion CO, H,0 02, N, chamber Air X kPa 20% excess where X= 180 Determine the air-fuel ratio. (You must provide an answer before moving on to the next part.) The air-fuel ratio is kg air/kg fuel.
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