How do you calculate economizer?
155STEAM BOILER, ECONOMIZER, AND AIR-HEATER EFFICIENCY The economizer efficiency = (heat absorbed, Btu/h)/(heat available, Btu/h) = 4,283,000/8,770,000 = 0.488, or 48.8 percent.
How do you calculate flue gas flow rate?
Most power plants calculate flue gas flow rate from the net energy consumption derived from the fuel flow multiplied by the Net Calorific Value (NCV). Alternatively, the power or heat output is divided by the electrical or thermal efficiency, as appropriate, in order to determine the net energy consumption.
What is the dew point of flue gas?
The acid dew point temperature depends on the levels of reactants present in the flue gas. It generally lies in the range 100-150°C.
How is boiler efficiency calculated with example?
In order to calculate boiler efficiency by this method, we divide the total energy output of a boiler by total energy input given to the boiler, multiplied by hundred. GCV= Gross calorific value of the fuel.
How do you calculate mixed air?
Mixed Air Temperature Calculator
- Formula. Tm = To * %OA + Tr * $RA.
- Temperature of Air 1.
- Temperature of Air 2.
- Percentage of Air 1 (%)
- Percentage of Air 2 (%)
How do I calculate outside air cfm?
The outdoor air intake = summation of Vbz in each zone divided by the calculated Ev value. For our example the summation of Vbz= 600 CFM, Ev = 0.6, then the outdoor air intake = 6000.6 = 1000 CFM….Table 2: System Ventilation Efficiency.
| Max (Zp) | Ev |
|---|---|
| Less than or equals 0.55 | 0.6 |
How is the dew point calculated?
Dew point can be calculated using the air temperature and a relative humidity value, which is measured using something called a sling psychrometer. A sling psychrometer measures relative humidity by measuring two temperatures: the actual air temperature (dry-bulb) and something called the wet-bulb temperature.
How do you find the dew point temperature of a flue gas?
To perform the Acid Dew Point calculation the engineer needs to input the following data which he can get from a combustion analysis program:
- Total Pressure of the Flue Gas: Ptotal (in Hg) = Pbar + Pgage
- Percent of Water Vapor in the Wet Flue Gas Volume Basis:
- Percent of Acid Gas in the Wet Flue Gas Volume Basis:
How is boiler efficiency calculated?
It is calculated by dividing the boiler output (in BTUs) by the boiler input (in BTUs) and multiplying by 100. The actual input and output of the boiler are determined through instrumentation and the resulting data is used in calculations that determine the fuel-to-steam efficiency.
How are flue gases used to improve boiler efficiency?
Boiler flue gases are often rejected to the stack at temperatures more than 100°F to 150°F higher than the temperature of the generated steam. Generally, boiler efficiency can be increased by 1% for every 40°F reduction in flue gas temperature.
How is the dry stoichiometric flue gas flow rate calculated?
As shown in the schematic, the dry stoichiometric flue gas flow rate (m3/s) is obtained by multiplying the heat release (MW) by a fuel factor (m3/MJ). The heat release can be obtained directly, from the plant thermal input (fuel flow * net calorific value), or indirectly, from the power output divided by the thermal efficiency.
What is the lowest temperature a flue gas can be cooled to?
The lowest temperature to which flue gases can be cooled depends on the type of fuel used: 250°F for natural gas, 300°F for coal and low sulphur content fuel oils, and 350°F for high sulphur fuel oils. These limits are set to prevent conden- sation and possible corrosion of the stack.
How does a feedwater economizer reduce boiler fuel requirements?
A feedwater economizer reduces steam boiler fuel requirements by transferring heat from the flue gas to incoming feedwater. Boiler flue gases are often rejected to the stack at temperatures more than 100°F to 150°F higher than the temperature of the generated steam.