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5 - June 2005 Introduction The Bacharach Flue-Gas Sample Conditioning System consists of the following components: • Probe with Peltier Cooler • Condensate Pump with Water Trap • Power Supply The function of this system is to remove water vapor from the flue-gas sample, thus preventing the formation of water droplets inside the probe hose. If water droplets were to form inside the hose, a portion of the gas sample could be absorbed by the water, thus resulting in lower-than-actual readings of NO2 and SO2. Water vapor is removed from the flue-gas sample by passing the sample through a Peltier Cooler where the sample is chilled, which in turn, causes the water vapor contained in the gas sample to be removed from the sample. The water that was extracted from the gas sample is then pumped out of the Peltier Cooler and into a water trap. The now dry, conditioned flue-gas sample is then sent to its associated combustion test equipment for analysis. Figure 1. Flue-Gas Sample Conditioning System Power Supply Product Leadership • Training • Service • Reliability Flue Gas Sample Conditioning System Technical Data Probe: Standard Length.........................................................11.5 in (295 mm) Optional Lengths.............................................................7 in (180 mm) 19.5 in (500 mm) 39 in (1000 mm) Peltier Cooler: Inlet Sample Dew Point..........................................149 °F (65 °C) max. Outlet Sample Dew Point.................18 °F (10 °C) min. below ambient Cooling Power.................................................................................10 W Environment Temperature.............................32 to 104 °F (0 to 40 °C) Weight................................................................................8.5 oz (240 g) Condensate Pump: Sample Flow Rate..........................................................1.5 LPM @ STP Length of Hose......................................................................6.6 ft (2 m) Reservoir Storage...........................................................................50 ml Environment Temperature.............................32 to 104 °F (0 to 40 °C) Weight..............................................................................12.7 oz (360 g) Power Supply: Input..............................................................100 to 240 VAC, 50/60 Hz Output............................................................9 VDC, max. @ 4 A, max. Equipment Setup Refer to Figure 2. If not already done, attach the Peltier cooler to the probe assembly by first removing the plastic end cap from the rear of the probe, and then inserting the cooler’s inlet connector, ensuring first that a filter is present between the cooler and probe. Attach the pump’s inlet hose to the bottom of the Peltier cooler. Water that is condensed from the flue-gas sample will be pumped into the condensate pump’s reservoir through this hose. Note that the condensate pump can be placed in an upright, horizontal, or hanging position. A magnet mounted in the base of the pump allows the pump to be attached to overhead ductwork. Connect the power supply’s DC output connector to the condensate pump; then connect the condensate pump’s DC output power connector to the Peltier cooler. The Peltier cooler and its associated condensate pump are started by plugging the power supply into a source of AC power that is between 100 and 240 VAC, 50/60 Hz. Connect the probe assembly’s stack-temperature thermocouple connector, pressure fitting, and flue-gas fitting to the combustion analyzer per the analyzer’s instruction manual. 2 Bacharach, Inc. Instruction 24-9415 Flue Gas Sample Conditioning System Figure 2. Equipment Setup POWER SUPPLY 100 - 240 VAC 50/60 HZ Instruction 24-9415 Bacharach, Inc. 3 Flue Gas Sample Conditioning System Operation When ready to conduct a combustion efficiency test, plug in the power supply of the Flue-Gas Sample Conditioning System. You should hear the condensate pump start running and see the Peltier cooler’s red LED turn on and off as the cooler is cycled. Note that the cooler’s operating time changes according to its temperature. Set up and configure the combustion analyzer as described in its instruction manual. Then insert the probe into the flue stack and begin testing. During the combustion test, the condensed water vapor from the flue gas will accumulate inside the pump’s reservoir. If the water level begins to approach the ends of the tubes inside the reservoir, then stop the test and empty the reservoir as described in the Maintenance Section of this manual. WARNING! The probe tube is hot! In the following step, be sure to allow the probe tube sufficient time to cool before handling. At the conclusion of the combustion test, remove the probe from the stack; then unplug the Peltier cooler’s power supply. 4 Bacharach, Inc. Instruction 24-9415 Flue Gas Sample Conditioning System Mainte...
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