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utility boilers
Selection of stainless steel tubes to minimize hot corrosion in utility boilers
      
Austenitic stainless steel tubes of AlSI 304, 316, 321, and 347 types are sometimes exposed to severe hot corrosion environments in superheaters and reheaters of utility boilers.
      
In this paper, the experience gained in utility boilers, with temperatures in the range of 800 °C to 1400 °C, is reported.
      
Several issues for applying it to utility boilers have been investigated in line with the present results, and some suggestions have been made.
      
Considering baseline mercury removal efficiency of up to 50% in the utility boilers due to the acid gases containing in the flue gas, above results indicate that 90% or more of gaseous mercury could be removed.
      
Modeling and coordinative optimization of NOx emission and efficiency of utility boilers with neural network
      
The above algorithm interconnected with a distributed control system (DCS) formed the supervisory control and achieved real-time coordinated optimization control of utility boilers.
      
Yet, all the small industrial units combined produce only a fraction of the steam compared with large utility boilers.
      
Accordingly, total annual costs of controlling Hg emissions from coal-fired electric utility boilers are examined in this section.
      
A schematic diagram for conventional coal utility boilers is shown below.
      
Analysis of the CMM dataset demonstrates that there is considerable temporal variability in mercury emissions from coal-fired utility boilers.
      
As the only market for FBC boilers rests the electric power generation in large utility boilers.
      
At REI, this process has been used successfully for more than 80 utility boilers and a significant number of laband pilot-scale furnaces.
      
As mentioned above, there are a wide variety of proven control technologies for reducing NOx and SO2 emissions from coal-fired utility boilers.
      
Babcock >amp; Wilcox has modified two coal-fired tangential utility boilers to low NOx operation with successful results.
      
Besides direct combustion, biomass can be co-combusted with coal in large utility boilers.
      
Coal-fired utility boilers typically emit some SO3, depending on the type of coal burned.
      
Demonstrations at two utility boilers have proven these benefits of the technology while decreasing the NOx emissions.
      
Emission limits for sub-bituminous coal fired utility boilers from the past five years were selected.
      
Figure 4 shows the NOx reduction achieved with several commercial Reburn systems on coal fired utility boilers.
      
 

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