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- Input-output method
Output is defined as the heat that is absorbed by working fluid. Input is defined as the chemical heat of fuel plus the heat that is added to working fluid, air, gas and other fluid circuit in which the fluid circuit across thin layer.
- Heat Loss Method
There are several factors act as the source of heat loss combustion. These factors will be used to calculate boiler efficiency based on heat loss method. The source of heat loss can be seen as following below:
a. Heat loss due to dry flue gas
Heat loss due to dry flue gas is the heat loss which is contained in dry flue gas such as CO2, O2 and N2. These gases are one of causes of heat loss in combustion process. The high temperature of flue gas coming out from boiler affect amount of heat loss.
The weight and heat loss of dry flue gas of combustion of coal can be calculated as following formula:
Wdfg = mCO2 + mSO2 + mO2 + mN2
Eloss dfg = Wdfg x Cp x (To - Ts)
Where:
Wdfg = weight of dry flue gas (kg/kg coal)
Eloss dfg = heat loss in dry flue gas (kJ/kg)
To = temperature of dry flue gas coming out from boiler
Ts = temperature of surrounding
by Gajanan Nalegaonkar
Wiki User
∙ 11y ago
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How calculate actual boiler drum level?
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The term "once-through boiler" refers to a special type of water-tube boiler composed oftubes, in which water is input at the bottom, and steam is produced from the top.
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A digester feed pump forces water to a boiler. It works by transferring cool water to the boiler to be heated.
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boiler efficiency is how much water is converting to steam.
How is boiler efficiency calculated?
Boiler efficiency is calculated by determining the steam value per hour and dividing it by the amount of fuel which is consumed per hour. By doing this one can determine the efficiency of a boiler.
How do you increase boiler efficiency?
we can increase boiler efficiency by recovering the heat which is being carried by flue gases.by incorporating different things like Economizer, Air pre-heater , Super-heater and feed-water heater, we can there ll be notable increase in efficiency of boiler.
What is efficiency of boiler?
see results in attached link: Philips 3-drum 'Accessable' boiler
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difine
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The economizer is used to raise feedwater temperature up to nearly the temperature of the boiler to avoid thermal shock and improve the boiler's efficiency. Every 11 degrees Fahrenheit increase in feedwater temperature yields a 1% increase in boiler efficiency.
What is efficiency of Lamont boiler?
see results in attached link: Philips 3-drum 'Accessable' boiler
Why economiser is used in boiler?
An economizer is used to heat boiler feedwater up closer to the temperature of the boiler water, using heat from the boiler exhaust gases, heat that would otherwise be wasted. The main reason is to improve the efficiency of the boiler. For every 44 degree F drop in exhaust gas temp. there is an 11 F rise in feedwater temperature and a 1% gain in boiler efficiency.
Why boiler is operated close to critical temperature?
Greatest efficiency at that temperature.
What is the formula of efficiency?
The formula of efficiency is power output divided by the power input.
How do you calculate Boiler feed pump efficiency?
Pump efficiency can not be taken as given.
What is the ratio of a boiler burner indicates the flexibility of the burner to cope with variations of boiler load without losing efficiency of atomisation?
turndown ratio
