Process and apparatus for treatment of volatile organic compounds

An apparatus of treating volatile organic compounds (VOC's) contained in exhaust gas flow, comprising:

• a first dew point temperature sensor arranged at an entrance of an exhaust gas passage for sensing a dew point temperature of the untreated airflow as a reference temperature;
• a humidifier arranged in the exhaust gas passage to spray water mist all over the exhaust gas flow for increasing humidity thereof;
• a condenser arranged in the exhaust gas passage and located at a downstream end of the humidifier to condense the exhaust gas flow into condensate contained the volatile organic compounds;
• a collecting tank arranged in the exhaust gas passage and located under the humidifier and the condenser to collect the condensate dropped from the humidifier and the condenser and transport the dropped condensate back to the humidifier for circulation spray;
• a second dew point temperature sensor arranged in the exhaust gas passage to sense a dew point temperature of the treated exhaust gas flow passing through the condenser;
• and
• a controller connected to the first dew-point temperature sensor, the condenser and the second dew point temperature sensor for feeding back a dew point temperature of the treated exhaust gas flow sensed by and the second dew-point temperature sensor to the controller to control the condensed level of the condenser and the dew point temperature of the treated exhaust gas flow to be close to the reference temperature sensed by the first dew-point temperature sensor.

An apparatus of treating volatile organic compounds (VOC's) contained in exhaust gas flow, comprising:

• a first dew point temperature sensor arranged at an entrance of an exhaust gas passage for sensing a dew point temperature of the untreated airflow as a reference temperature;
• a cryogenic humidifier arranged in the exhaust gas passage to spray water mist all over the exhaust gas flow for increasing humidity thereof and to cool down and condense the exhaust gas flow into condensate contained the volatile organic compounds;
• a collecting tank arranged in the exhaust gas passage and located under the cryogenic humidifier to collect the condensate dropped from the cryogenic humidifier and the dropped condensate cooled down by a cooler and then transported back to the humidifier for circulation spray;
• a second dew point temperature sensor arranged in the exhaust gas passage to sense a dew point temperature of the treated exhaust gas flow passing through the condenser;
• and
• a controller connected to the first dew-point temperature sensor, the cooler and the second dew point temperature sensor for feeding back a dew point temperature of the treated exhaust gas flow sensed by and the second dew-point temperature sensor to the controller to control the condensed level of the cooler and the dew point temperature of the treated exhaust gas flow to be close to the reference temperature sensed by the first dew-point temperature sensor.