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林振宇 - Chenyu

- Thesis topic: Effect of Diesel Oxidation Catalyst and Diesel Particulate Filter on Traditional and Toxic Pollutant Emissions from Diesel Electricity Generator

- Doi: https://doi.org/10.6840/cycu202201713

- Abstract: 

        Numerous large factories and high-rise buildings in Taiwan require to have generators to maintain the operation of electrical and mechanical equipment in case of circuit interruptions or emergencies. Moreover, the high efficiency and low fuel cost of diesel engine generators have led to the increasing use of diesel engine generators. However, only the oil composition standard has already been regulated in diesel engine regulation, not the exhaust emission pollutants, which often leads to soot and even false fire alarm when diesel engine generators are started. However, to solve the pollutant emissions from diesel engine generators, installing smoke filters at the rear end is an effective treatment method nowadays. Therefore, this study combines the Diesel Oxidation Catalyst (DOC) and Diesel Particulate Filter (DPF), which were already used in diesel engine vehicles, and applies them to diesel engine generators. In order to confirm its effectiveness, the effects of the after-treatment installation were analyzed for fine suspended particulates, gaseous pollutants, and toxic pollutants emitted from the tailpipe and used as a reference for the government regulations to evaluate the pollution reduction technology of large diesel generators by installing after-treatment in the future.
         The study showed that the PM2.5 removal rate of different work conditions could reach over 98% after installing DOC+DPF. In the gaseous pollutant part, after DOC+DPF treatment, the removal efficiency of CO ranged from -7.09 to 59%. The removal efficiency of HC was 24% because NOx and SO2 would be oxidized with Pt in the coating metal to NO3- and SO3-, and the removal rate was up to 60.8% and 71%. From the viewpoint of the total TEQ, the diesel engine generator exhaust gas is processed by DOC+DPF, and the diesel engine generator exhaust temperature of this study is close to the PCDD/Fs generation interval (200<T2<450) when the load is changed, so that the residual carbon will be formed again with chlorine in the afterburning area to cause the removal efficiency to drop the removal efficiency of -44.1%, but in general, because there will be no accumulation of particulate matter, However, in general, since there was no accumulation of particulate matter, it is still effective in reducing the generation trend, and the removal efficiency ranges from 6.54 to 85.4%. The results also found that PBDD/Fs may have a higher TEQ emission coefficient than PCDD/Fs.

Keywords: Diesel engine generator, Diesel oxidation catalyst, Diesel particulate filter, Suspended particulates, PCDD/Fs

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