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Instrumentation and Control        205




             TABLE 9.1  Process control measuring and monitoring.
                                                                           Regulatory
                                                                           compliance
                                                                             (excess      Business
                                                                            emissions   (production,
                                                                           control and   inventory,
                                                                            emission     accounting,
                                                                           compliance    budgeting,
                                                              Safety and   monitoring,    and asset
                                                   Process    personnel   recording, and  management
                            Control loop           control    protection  recordkeeping)  planning)
              1. Feed control
                 • Biosolids
                 • Auxiliary fuel                     •          •             •             •
              2. Combustion control
                 • Combustible atmosphere safety purge
                 • Incinerator flame loss control
                 • Burner control
                 • Oxygen control                     •          •
              3. Pressure control: incinerator vessel   •        •
                 pressure and draft
              4. Temperature control
                 • Incinerator vessel
                 • Hearths, bed, freeboard, chamber
                 • Air pollution control equipment
                 • Heat recovery equipment, ducts,    •          •             •
                   related equipment
              5. Emission measurement and control
                 • Total hydrocarbon, CO, NO , SO
                                         X   X
                 •O , CO , moisture
                    2   2
                 • Opacity
                 • Particulate matter                 •                        •
              6. Air pollution control systems
                 • Wet scrubber water flow, 	P
                 • Dry fabric filter flow, 	P
                 • Electrostatic precipitator (ESP), wet
                   ESP applied volt, ampere, kilowatt
                 • Chemical addition, pH adjustment   •                        •
              7. Utility system
                 • Electric use, fan/blower horsepower
                 • Water and sewer use
                 • Compressed air
                 • Fuel use—natural gas, oil
                 • Chemical use
                 • Ash handling                       •                                      •
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