KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Settings

Author: search.filters.author.Wiangtong, TheerayodSubject: search.filters.subject.electrostatic precipitator

Search Results

Now showing 1 - 2 of 2
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Effect of Rapping Frequency and Intensity in Electrostatic Precipitator Efficiency
    (2023-01-01)
    Banthoengjai, Thanpilin
    ;
    Wiangtong, Theerayod
    ;
    Pattanadech, Norasage
    ;
    Pannil, Pittaya
    Electrostatic precipitator (ESP) is one of air pollution control equipment which widely use in biomass power plant. There is a rapping system in ESP use for removing ash from collecting plate (CP) and discharge electrode (DE). Rapping frequency and intensity of rappers effect the efficiency of ESP because they relate to dust quantity in ESP. Dust layer at CP, which has $108\ \Omega\mathrm{m}$ of resistivity, can cause back corona. Back corona can cause spark in dust layer. To prevent back corona, ESP should operate at lower voltage. Therefore, ESP efficiency is also lower. A chance of ash accumulation is depended on ion charged in dust particle. Rapping cause re-entrainment of dust particle which is uncharged. Re-entrainment dust particle increase uncharged dust in charging area. Therefore, charging process require more ion to charge more dust particle but generating more ion can cause spark over in ESP. There is the appropriate rapping frequency and intensity of rapping due to ESP condition. To study the effect of rapping system in ESP, the experiment was set in 9 cases. The rapping system in the experiment was set as different round trip time (RTT), which determine the rapping frequency, and lifting distance, which determine the intensity. There are 3 different RTT, 2, 3, and 4 minutes, and 3 lifting distance, 8, 10, and 12 inches. Total suspended particulate (TSP) was measured by EPA Method 5 and analyzed by Isokinetic and Gravimetric method to compare the efficiency of ESP in each case. Changing in rapping frequency and intensity of rapping system affect TSP. In case which lifting distance is 8 and 10 inches, TSP tend to decrease when rapping frequency was decreased, means higher efficiency of ESP. On the other hand, TSP tend to increase when rapping frequency was decreased in case of lifting distance is 12 inches. The lowest TSP was the case with 4 minutes RTT and 8 inches lifting distance. From the experiment, there is an appropriate value of rapping frequency and intensity of rapping system. Setting rapping system improve ESP efficiency.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    A Cylindrical Electrostatic Precipitator Design and Operating Voltage Calculation
    (2023-01-01)
    Yodrayub, Noppol
    ;
    Wiangtong, Theerayod
    ;
    Pattanadech, Norasage
    This research presents the method for electrostatic precipitator (ESP) design based on determining the initial parameter including inlet gas volume, collection efficiency, and particle diameter. In addition, the design for particle diameter 1 um from the incinerator dust which the migration velocity from the calculation is 0.087 m/s, collection efficiency 90%. The collection area can be calculated by using Deutsch-Anderson equation to estimate the total number of collecting electrodes and discharge electrodes. This research uses 2 mm for the diameter of the discharge electrodes, 76.2 mm (3 in) for the diameter of the collecting electrode, and 1 m for the length of discharge electrode and collecting electrode. The total number of each type of electrode is 31. The corona inception voltage from the calculation is 16.7 kV for the operating condition, temperature 150 °C pressure 1 atm, inlet gas volume 1000 m3/hr. However, the collection efficiency of ESP also depends on other factors, such as pressure drop and gas distribution in ESP, which neglecting in this research.