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Study of Using Mixed Discharge Electrodes and Mixed ... - isesp

Study of Using Mixed Discharge Electrodes and Mixed ... - isesp

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Study of Using Mixed Discharge Electrodes and Mixed Spacing of Pole to Pole for Electrostatic Precipitator 85field should use the mixed wires and mixed spacing. Thewires with good discharge performance should place in thefield 1 and 2, this is because the field 1 and 2 have thehigher dusts concentration, and when dusts enter into theESP from ductwork, the dusts can be fully charged quickly.More often than not, the new type wide saw wires with thesame pole spacing of 300 mm–420 mm are chosen in field 1and 2, and it is not only a good discharge performance, butalso has the more discharge orientation, strong electric windand avoidance of the corona dead area, so it excels othertype of wires under the high dust concentration condition.For the third field, because the dust concentration iscomparatively low, the wires with good performance alsoare needed for fully and rapidly charging. So, the integraltube type thorn wires or wide saw wires with spacing of 400mm–420 mm were selected in field 3, it has the gooddischarge performance, strong electric wind and avoidance ofthe corona dead area and excel the other type of wires, andthe dusts can be fully charged under the high gas velocity. Forfield 4 and field 5, the fishbone wires plus auxiliaryelectrodes with spacing of 440 mm–500 mm and the tworows of channel plates with the maze type are selected, whichcan effectively reduce the dusts re-entrainment.4 APPLICATION STATUS OF MIXED WIRES ANDMIXED SPACING OF POLE TO POLERecent years, the present technology, aiming to thefeature of coal in coal fired power station, has been used fortens of boilers for A power station (135 MW), B powerstation (330 MW) and C power station (660 MW) andobtains the good experiences, for example:Table 1 Coal performance analysis for A (135 MW unit)Name Unit Design coalC content received % 51.76H content received % 3.33O content received % 3.99N content received % 0.82S content received % 0.23Ash content received % 34.45Water content received % ––Water(dry base) received % 0.59Volatile content(non dusts base) % 29.77Heat quantity for low line MJ/kg) 20.94Grindability index –– 89Table 2 Ash component analysis for A (135 MW unit)Name Unit Design coalSiO 2 % 54.8Al 2 O 3 % 24.9Fe 2 O 3 % 9.4TiO 2 % 0.94SO 3 % 0.82CaO % 6.28MgO % 0.98K 2 O % 0.47Na 2 O % 0.22MnO 2 % 0.064Table 3 Fly-ash resistivity analysis for A (135 MW unit)Test temperatureDesign coal26.5 ℃ 8.77×10 9100 ℃ 6.33×10 11120 ℃Ω•cm2.14×10 12150 ℃ 4.54×10 12180 ℃2.86×10 12Table 4 Coal (Zhungeer) performance analysis forB (330 MW unit)Name Unit Design coalC content received % 43.21H content received % 3.42O content received % 10.55N content received % 0.69S content received % 0.43Ash content received % 31.7Water content received % 10.0Water(dry base) received % 2.94Volatile content(non dusts base) % 40.87Heat quantity for low line MJ/kg) 16.294Grindability indexTable 5 Ash component analysis for B (330 MW unit)Name Unit Design coalSiO 2 % 38.22Al 2 O 3 % 51.72Fe 2 O 3 % 1.38TiO 2 % 1.30SO 3 % 1.75CaO % 1.36MgO % 0.23K 2 O % 0.43Na 2 O % 0.02MnO 2 % ––Table 6 Fly-ash resistivity analysis for B (330 MW unit)Test temperatureDesign coal18 ℃ 4.5×10 12100 ℃ 9.4×10 12120 ℃Ω•cm4.00×10 13150 ℃ 6.5×10 13180 ℃1.20×10 13Table 7 Coal (Zhungeer) performance analysis forC(660 MW unit)Name Unit Design coalC content received % 58.11H content received % 3.39O content received % 9.74N content received % 0.92S content received % 0.45

8611th International Conference on Electrostatic PrecipitationAsh content received % 17.79Water content received % 9.60Water(dry base) received % —Volatile content(non dusts base) % 27.13Heat quantity for low line MJ/kg 22.06Notes: J – wide saw wiresRS– integral tube type thorn wiresYf– fishbone plus auxiliary electrodesTable 8 Ash component analysis for C (660 MW unit)Name Unit Design coalSiO 2 % 40.63Al 2 O 3 % 41.28Fe 2 O 3 % 7.69TiO 2 % 0.57SO 3 % 0.32CaO % 2.35MgO % 4.00K 2 O % 0.82Na 2 O % 0.16MnO 2 % —Table 9 Fly-ash resistivity analysis for C (660MW unit)Test temperatureDesign coal18 ℃ 4.3×10 11100 ℃ 2.4×10 11120 ℃Ω•cm1.5×10 12150 ℃ 1.7×10 12180 ℃2.8×10 11Table 10 The parameters table of mixed wiresconfiguration and spacing of pole to pole for A, B and Cpower stationsNameField 1WiresSpacing mmField 2wiresSpacing mmField 3WiresSpacing mmField 4wiresSpacing mmField 5WiresSpacing mmSCAm 2 /m 3 secEfficiency%A powerplantJ410J410Yf500Yf500B powerplantJ304J304Rs400Yf451C powerplantJ410J410J410Yf448— Yf44882.36 118.57 112.1799.4 99.7 99.77

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