Plastic granulation waste gas treatment system and method

Abstract

The invention relates to the technical field of waste gas purification treatment. The plastic granulation waste gas treatment system comprises a vacuum pump which is connected with a gas collecting hood of granulation equipment. The system further comprises a washing oil separation tower, a wire mesh demister, a deodorization device, a fan and a high-altitude chimney, which are sequentially connected with an outlet of the vacuum pump, the washing oil separation tower is provided with a water inlet, and clear water is pumped to the water inlet through a water pump after oil is separated from abottom oil separation tank. According to the plastic waste gas treatment method, oil mist and particles in granulation waste gas are cooled by a vacuum pump to be converted into a liquid phase, and then the liquid phase is subjected to secondary purification treatment by a washing oil separation tower and a wire mesh demister, deodorized and discharged through a high-altitude chimney. After treatment, the non-methane total hydrocarbon content is less than 50 mg / m<3>, and the odor concentration is less than 800 (dimensionless), which is superior to the corresponding emission standard of 'Synthetic Resin Industrial Pollutant Emission Standard' (GB31572-2015).

Description

technical field [0001] The invention relates to a waste gas purification treatment system, in particular to a waste gas treatment technology in the plastics industry. Background technique [0002] In the plastic production, modification and compounding industries such as PVC, PC, ABS, PET, PBT, ABA, PE, etc., the mixed materials are usually heated to a molten state and extruded through an extruder to granulate. This process will generate a large amount of oil mist, volatile organic compounds and dust, which are complex in composition and have a foul smell. They need to be treated by treatment equipment to meet the standards before they can be discharged. [0003] At present, "scrubbing tower + oil fume purifier + activated carbon adsorption tank (or UV photooxidation equipment)" is commonly used for treatment. Since the granulation waste gas has the characteristics of high temperature, oil mist and dust, and complex volatile organic compounds, the above conventional treatmen...

AI Technical Summary

Problems solved by technology

This process will produce a large amount of oil mist, volatile organic compounds and dust, which are complex in composition and have a foul smell. They need to be treated by treatment equipment to meet the standards before they can be discharged.

[0003] At present, "scrubbing tower + oil fume purifier + activated carbon adsorption tank (or UV photooxidation equipment)" is commonly used for treatment. Since the granulation waste gas has the characteristics of high temperature, oil mist and dust, and complex volatile organic compounds, the above conventional treatment It is difficult to remove the oil mist and particles through the washing tower and the oil fume purifier, and even the oil fume purifier catches fire due to improper maintenance

If the oil mist and particulate matter cannot be removed, it will directly affect the treatment effect of the activated carbon adsorption tank and block the activated carbon adsorption tank, which is difficult to meet the current environmental protection requirements.

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