Methods to Calculate CFB Boiler Efficiency
Boiler efficiency is extremely important. If the boiler isn’t burning fuel at a satisfactory rate, or if the heat has been lost over the surrounding system without being put to use, you choose a lot of waste and can even come upon problems meeting emissions standards.
The thing is, “boiler efficiency” is a loose term that can mean many different things. It’s often used to refer to thermal efficiency or combustion efficiency, for instance. To help clarify,we would summarize all of the kinds of boiler efficiency. All of them calculate efficiency differently and can therefore that have their own particular economic implications.
Combustion efficiency measures how effectively a CFB boiler transfers the chemical energy stored in fuel into usable heat. Reaching optimum combustion efficiency typically requires pumping additional air into the combustion chamber so that all fuel can be burned.
Without enough oxygen, some fuel will be left unburned and end up being soot, smoke, or carbon monoxide. Too much oxygen, on the other hand, will create excessively hot flue gas, which isn’t able to transfer all of its heat into steam production. According to combustion efficiency calculations, a CFB boiler is considered efficient when it has low levels of unburned fuel and does not require much extra air.
Determining the proper amount of air to add to a combustion process is a matter of measuring stack temperature and concentrations of either oxygen or carbon dioxide in flue gas. If you’re burning natural gas, the U.S. Department of Energy has a useful tip sheet that includes a table for making this calculation
CFB Boiler Thermal Efficienc
Thermal efficiency measures how well a CFB boiler’s heat exchanger transfers heat from the combustion process to the water or steam in the boiler. A simple ratio expressed as a percentage, thermal efficiency is basically the input energy transferred to the water or steam heating process divided by the output energy of the combustion process.
Thermal efficiency’s shortcoming as a measure of CFB boiler efficiency is that it only measures the effectiveness of the heat exchanger. Because thermal heat can also be lost through radiation and convection via other boiler components, such as the shell or water column, thermal efficiency is limited as a calculation for measuring boiler efficiency.
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