Note: using, partial failure and complete failure of the status of bag filter were defined as failure rate of that below 3%, 3-30% and above 30%, respectively.
The flue gas containing NOx, SOx, dust particles from combustion tower was emitted to the atmosphere after processing with denitration, dedusting and desulphurization in sequence, and the detailed information was shown in Fig. 1. Samples collecting from factories were placed in the step of dedusting under the temperature of 110-180 ℃ after NOx was removed from flue gas through denitration. The bag filter would execute the operation of cleaning when the resistance of that reach to the critical point, and thus could be used repeatedly unless the filter was damaged completely. The corresponding information of samples with different loading units was summarized and shown in Table 1 (below 200 MW), Table 2 (200-300 MW) and Table 3 (above 300 MW), respectively.