What is Energy Consumption? | Combustion Efficiency


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What is Energy Consumption?

It is the quantity of energy necessary to produce a unit of the product.
According to the energy and mass balance for a processing plant, energy consumption can be expressed as follows: Efficiency computations are the basis for estimating energy saving potential. The basic method is to compare the efficiency computed from the balance with a benchmark performance. Good performance is often referred to as a benchmark. Benchmarks are not fixed or constant over time and across process. They must take into account actual operating procedures and technological evolution.
1. Fuel energy= 12096.6 kJ/kg product
2. Mechanical Work =2326.3 kJ/kg product
3. Specific Gas Consumption a=0.757 Nm³/kg product
4. 43.2% of Natural gas is used for energy purposes, while 56.8% of Natural gas is used as raw material

Combustion Efficiency

Combustion efficiency ηc is a measure of the ability of a given fired system to convert fuel into useful heat
η c = Useful Heat/ Total Energy Available in Fuel
Combustion Losses arise principally in the following three categories:
1. Heat carried out of the stack by dry flue gas
2. Heat carried out by hot water vapor
3. Unburned fuel and products of incomplete combustion (i.e., CO and HC)
Calculation methods for combustion efficiency can be classified into, direct method, where:

η c =(Total Fuel Energy- Total Flue Gas Energy )/Total Energy Available in Fuel
And indirect method, where η c =100- (sum of combustion losses %). The later method is more widely used in practice.

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