By F. William Payne, Richard E. Thompson
Totally illustrated e-book brings you checking out and flame review thoughts, steps for bettering keep watch over of extra ventilation, easy-to-follow boiler potency calculation tools, and a wealth of alternative valuable info for bettering combustion potency. DLC: Steam-boilers - potency.
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Example text
Other losses occur from surface heat transfer to the atmosphere and incomplete combustion of the fuel. The proper calculation of boiler efficiency requires a definition of the boiler "envelope" which isolates the components to be considered part of the boiler from those that are excluded. Figure 4-1 from the next chapter, taken from the ASME Power Test Code, shows equipment included within the envelope boundary designating the steam generating unit. Heat inputs and outputs crossing the envelope boundary are involved in the efficiency calculations.
In addition, boiler design efficiency is sometimes used as a reference point for establishing tuned-up efficiency. Calculations of tuned-up boiler efficiency levels have also been made using typical tuned-up excess air levels as per manufacturers and data from the DOE. The results of these analyses are presented in Table 2-2. Again, reasonable agreement between the three methods are evident. Maximum Economically Achievable Efficiencies Several factors (as discussed in Chapter 18) are involved in the determination of the cost effectiveness of auxiliary equipment addition.
Note that the exit gas temperature will depend on the stack gas heat recovery equipment (economizer and/or air preheater) on the unit. The heat loss due to moisture in the fuel equals the pounds of water per pound of fuel times the enthalpy difference between the water vapor at exit gas temperature (Item 13) and water at ambient temperature (Item 11). The heat loss due to water vapor formed from hydrogen in the fuel equals the weight fraction of hydrogen in the fuel times 9 (there are approximately 9 pounds of water produced from burning one pound of hydrogen) times the enthalpy difference between the water vapor in the stack and the liquid at ambient temperature.
