Solution to the Problem of Precipitation of High-Resistivity Ashes by Electrostatic Precipitators
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Vol. 54, No. 3, September, 2020
SOLUTION TO THE PROBLEM OF PRECIPITATION OF HIGH-RESISTIVITY ASHES BY ELECTROSTATIC PRECIPITATORS L. V. Chekalov,1 V. A. Guzaev,2 and M. E. Smirnov1 Translated from Élektricheskie Stantsii, No. 4, April 2020,, pp. 54 – 59.
The innovative and highly effective Russian electrostatic precipitators of the ÉGAV type were created in order to solve problems associated with the reduction of ash emissions at coal power plants. The new electrostatic precipitators ensured an increase in precipitation effectiveness to 99.87% in the same overall housing sizes along with a reduction in emissions up to 16 times, with actual emissions ranging from 12.6 to 119 mg/m3 (under standard conditions). The technical solutions for intensifying electrostatic precipitation realised in ÉGAV precipitators increase particle drift velocity to the precipitating electrode by 65%. The application of the ÉGAV type electrostatic precipitators for removing high-resistivity ashes from flue gases led to the required reduction of emissions during the modernization of the acting electrostatic precipitators. The cost of reconstructing the gas-cleaning unit with the application of innovative electrostatic precipitators turned to be less than with the use of a combined electrostatic precipitator or a bag filter. The new electrical cleaning technology also formed a scientific basis for the innovative development of other promising gas-cleaning technologies. Keywords: electrostatic precipitator; high-resistivity ash; drift velocity; ash emissions.
50831–95 [2], this indicates the acting emission requirements (Table 1) for the currently operating gas-cleaning units (GCU) utilized in the heat-power engineering to be unimplemented or implemented at the critical level. In European countries, the emission norm directive of 2010/75/ES requires the filtration effectiveness at electrical stations to be ensured with a residual dust content of 10 – 20 mg/m3 (under the standard conditions). This is lower than the actual level of CHP emissions in Russia by more than 10 times. According to the recommendations published in GOST R 54204–2010 [3] regarding the application of advanced technologies for the removal of dust from flue gases at large CHP burning hard and ligneous coal, the dust emission level for both projected and currently operating enterprises is established within the limits of 5 – 30 mg/m3 (under standard conditions) with a cleaning effectiveness of 99.5 – 99.95% and 99.95 – 99.99% for electrostatic and bag filters, respectively. Therefore, in terms of advanced technologies, electrostatic and bag filters are recommended. For the cleaning of large volumes of flue gases, however, electrostatic precipitators are most widely used in Russian heat-power engineering. Under such conditions, the use of contemporary and innovative Russian electrostatic precipitators of the ÉGAV
One of the priority tasks associated with the ecological situation in Russia involves the removal of the solid ash particles from flue gases. To a certain degree
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