3. Combustion Requirements

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Combustion requirements combustion can only occur if three factors are present oxygen heat and fuel.

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In the case of a boiler oxygen is provided by ambient air which contains approximately 21 percent oxygen

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predominant boiler fuels or natural gas fuel oil and coal heat can be supplied during the ignition such

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as when creating electric arc to ignite the air fuel mixture.

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A fire triangle also known as a combustion triangle indicates the requirements of combustion.

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A fire texture Hedren shown below performs a similar purpose you can see we've got fire triangle or

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combustion triangle.

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In this case is a tech region because we got the bottom on with the chain reaction shown and we need

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heat fuel and oxygen in order to get combustion.

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The three combustion factors must also be provided in the proportionally correct manner otherwise combustion

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cannot occur.

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Too much air and too little fuel may prevent combustion as well too much fuel and too little air so

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we need three things for combustion oxygen heat and fuel.

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And it's not just that we need these things we need them to be proportionally correct in order that

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we can get combustion as an example if we flood an engine.

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It means we've provided too much fuel and we can't get combustion inside the cylinder chamber and that

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means the engine cannot be started.

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So that is flooding an engine too much fuel and too little oxygen.

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On the other hand if we starve the engine of air let's say we have dirty air filters then the air will

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not get enough oxygen for combustion so two different extremes.

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But we always need to have the right combination the right proportion of oxygen fuel and heat in order

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to get combustion.