Abstract
In order to ensure that the vehicle exhaust analyzer can work normally with the harsh conditions of the high temperature exhaust, the sample gas must be dewatered, dedusted and cooled without distortion. A new pretreatment technology for motor vehicle exhaust has been proposed in this paper. On the basis of the principle of cyclone separator with particles filter chamber, cyclone separator, liquid resistance and membrane type dryer as main devices, the particles filter chamber for dedusting, metal spiral pipe for cooling, cyclone separator for dewatering and dedusting, liquid resistance and membrane type dryer for dewatering have been used in the designed system. It can pretreat the exhaust without changing the exhaust composition, so the sample gas clarity can be increased. Field experiment results show that the designed pretreatment system can remove more than 5 um particle diameter. With it the exhaust temperature of range (180,210)°C can drop to around 39°C, the relative exhaust humidity of range (65,75)% can fall to about 25%, which can ensure the long-term stable operation of the online analysis instrument for high temperature exhaust.
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