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Source: C.D. Cooper and F.C. Alley, 1986, Air pollution control: A design approach (Boston: PWS Publishers).

Source: C.D. Cooper and F.C. Alley, 1986, Air pollution control: A design approach (Boston: PWS Publishers).

This relationship gives the corona power necessary for a given precipitation efficiency, independent of the precipitator design. The maximum corona power capability of the electrical sets should be considerably higher than the useful corona power.

The corona electrodes in large precipitators are subdivided into multiple groups or sections, referred to as bus sections. These sections are individually powered by separate rectifier sets to reduce the effects of sparking and better match the corona voltages and currents to the electrical characteristics of the gas and dust. The degree of sectionalization is expressed as the number of sections per 1000 m3/min. This parameter is a measure of the precipitator's ability to absorb corona power from the electrical sets. ESP performance improves with sectionalization. This improvement may be due to better electrode alignment and accurate spacing (White 1977). Sectionalization also implies that the unit is operational even if a few bus sections are taken offline.

Table 5.17.1 gives the range of some design parameters. A design engineer can specify the basic geometry of an ESP using the information in the table.

The following equation determines the total number of channels in parallel or the number of electrical sections in a direction perpendicular to that of gas flow Nd:

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