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To ensure complete combustion of the fuel used, combustion chambers are supplied with excess air. Excess air increase the amount of oxygen and the probability of combustion of all fuel
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Why Small holes are provided at the bottom of the chimney in an oil lamp?
Air is need for combustion.
Why does excess supply of oxygen lead to complete combustion?
Complete combustion of a hydrocarbon yields carbon dioxide & water; incomplete combustion yields carbon monoxide & water. By having excess oxygen you have enough oxygen to ensure complete combustion. For example the combustion of methane (CH4):complete combustion: CH4 + 2O2 --> CO2 + 2H2Oincomplete combustion: CH4 + 1.5O2 --> CO + 2H2OAs you can see you need a 1/2 mole less of oxygen for the incomplete combustion of methane. So as long as you have twice the amount (in terms of moles) of oxygen as methane you will ensure complete combustion. So anything in excess of that will also ensure complete combustion.
What is bad about natural gas?
When natural gas is burned, carbon dioxide is released into the air as a product of the combustion, and the air already has an excess amount of carbon dioxide, which is a greenhouse gas, which contributes to global warming.
Does air support combustion?
Yes, combustion requires oxygen which is found in air.
What will happen if the air is limited during the combustion?
If limited then combustion is reduced, if totally restricted then there's no combustion at all
Why is converting coal into electricity inefficient?
Burning coal requires between 100 and 150% excess air for complete combustion. Excess air is the air supplied for combustion more then the air required for perfect combustion. Perfect combustion is the minimum amount of air, if all the oxygen is used, to completely burn the coal, (this is impossible). Oil requires 30-50% excess air and Natural gas requires 10-30% excess air for complete combustion. So combustion of coal is less efficient than these. However, the process of generating steam and producing electricity otherwise is no less efficient than any other means. Excess air as a result carries more heat up the stack which cannot be recovered, thus the reduction in efficiency. Overall this reduction in efficiency only amounts to about a 5% reduction in plant generating efficiency, or less.
Why is stoichiometric combustion rare?
Stoichiometric combustion is almost never possible because of imperfect fuel-air mixing. For economy and safety, most combustion equipment (such as heaters, furnaces, and engines) should operate with excess air to ensure that fuel is not wasted and that combustion is complete
Why Small holes are provided at the bottom of the chimney in an oil lamp?
Air is need for combustion.
What is important about measuring the percentage of O2 in the flue gas from fired equipment?
The percent O2 in the flue gas is a measure of the combustion efficiency of the burner. The burner requires excess air to complete the combustion process. This amount of excess air is measured by measuring the O2 in the flue gas and plugging the results into the formula: [O2 / (20.9 - O2)] x 100 to determine the amount of excess air. 0% excess air is 100% combustion efficiency.
Why does excess supply of oxygen lead to complete combustion?
Complete combustion of a hydrocarbon yields carbon dioxide & water; incomplete combustion yields carbon monoxide & water. By having excess oxygen you have enough oxygen to ensure complete combustion. For example the combustion of methane (CH4):complete combustion: CH4 + 2O2 --> CO2 + 2H2Oincomplete combustion: CH4 + 1.5O2 --> CO + 2H2OAs you can see you need a 1/2 mole less of oxygen for the incomplete combustion of methane. So as long as you have twice the amount (in terms of moles) of oxygen as methane you will ensure complete combustion. So anything in excess of that will also ensure complete combustion.
Does air support combustion?
Yes, combustion requires oxygen which is found in air.
What is bad about natural gas?
When natural gas is burned, carbon dioxide is released into the air as a product of the combustion, and the air already has an excess amount of carbon dioxide, which is a greenhouse gas, which contributes to global warming.
What is a lean burn system?
A lean burn system is a fuel burning system that uses an excess of air in an internal combustion engine. They provide a high air to fuel ratio and are used in some vehicles.
Why high air flow rates r not allowed in furnaces?
Actually combustion reactions takes place in Furnaces. So when we keep high flow rate then the air to fuel ratio increases which means excess air will be wasted. The compressing of air also takes more energy which will be wasted. If we give excess air flow then we are simply taking away the heat produced to outside the furnace.
Does internal combustion engine needs air to work?
By nature ,all combustion needs air .
Why higher density air is better for combustion?
The higher the air density, the more oxygen available for combustion.
Is air combustion toxic?
no
