Burns a blend of Powder River Basin (PRB) and Bituminous Coal
Relatively clean Economizer with occasional platenization; Primary Superheater shows more fouling than Economizer
Unit 1 exhibits fouling in the two Primary Superheater bundles and two Economizer bundles in the backpass
Platenization (i.e. vertical blockage of the backpass tubes) degrades boiler efficiency and raises economizer exit gas temperature above the allowable 700°F
Det-cord blasting is required for removing the platenization
Some ash piles are also present but are a minor concern
Solution :
Installed a demonstration combustor on the Upper & Lower Economizer Bundles
Utilized an existing manway opening on the South Side Wall
Performance :
The SHOCKSystem™ was operated intermittently and with varying power levels
Low exit temperatures seen in the two month timeframe which corresponds with the SHOCKSystem™ operation period
SHOCKSystem's™ Bottom-Line Impact :
Economizer exit temperatures on the demo side dropped relative to corresponding exit temperatures on the other side in direct correlation to the power and timing of SHOCKSystem™ operations
Economizer exit temperatures dropped by 30°F after on date which corresponds with first day of operation
Economizer exit temperatures on both sides were 20°F- 30°F lower in two month timeframe which corresponds with the operation period
Variance seen in economizer exit temperatures was smaller during the periods when the SHOCKSystem™ was operated
Economizer Exit Temperature South Histogram :
Equal number of data points used for before and during operation
Histograms comparing South Side economizer exit temperatures before and during SHOCKSystem™ operation period shows lower exit temperatures and smaller standard deviation in exit temperatures during SHOCKSystem™ operation period.
Standard deviation during four-day SHOCKSystem™ operation: 5.5
Four-day standard deviation before SHOCKSystem™ operation: 12
