Polypropylene VOCs treatment environment-friendly recovery system

Abstract

The invention relates to the technical field of tail gas recovery treatment, in particular to a polypropylene VOCs treatment environment-friendly recovery system. The system comprises a flash evaporation replacement tail gas recovery system and a feeding hopper activator nitrogen pressure feed system. The flash evaporation replacement tail gas recovery system comprises a bag-type dust remover, a vacuum compressor unit, a water-vapor separation tank, a pre-condenser, a drying tower, a gas tail gas dehydration tower, a gas holder oxygen content analyzer, a gas oxygen content analyzer, a propylene recovery gas holder, a first communicating pipe, a second communicating pipe, a first gas exhaust holder switching valve and a first gas exhaust switching valve. The feeding hopper activator nitrogen pressure feed system comprises nitrogen buffer equipment and a nitrogen buffer tank, the input end of the nitrogen buffer equipment is communicated with the nitrogen tank, the output end of the nitrogen buffer equipment is communicated with the nitrogen buffer tank, and the output end of the nitrogen buffer tank is communicated with the nitrogen pipe network so that propylene can be recycled, the enterprise cost is reduced, the enterprise economic efficiency is improved, VOCs are prevented from being discharged, and the environmental protection property is improved.

Description

technical field [0001] The invention relates to the technical field of tail gas recovery and treatment, in particular to an environment-friendly recycling system for polypropylene VOCs treatment. Background technique [0002] In the small-body batch polypropylene production process, the polypropylene powder after the reaction in the polymerization tank is sprayed into the flash tank, and the propylene gas contained in the powder is discharged directly after being vacuumed and replaced by nitrogen in the flash tank. into the atmosphere. In addition, the activator added in the reaction of the polymerization tank, due to the residual propylene in the activator hopper during the feeding process, causes the residual pressure to be too high. The internal pressure of the hopper needs to be diluted by the kerosene tank and then discharged into the atmosphere to reduce the internal residual pressure. Then there is nitrogen to press the activator into the activator hopper, and VOCs w...

AI Technical Summary

Problems solved by technology

In addition, for the activator added in the reaction of the polymerization tank, the residual pressure is too high due to the residual propylene in the activator hopper during the feeding process, and the internal pressure of the hopper needs to be diluted by the kerosene tank and then discharged into the atmosphere to reduce the internal residual pressure. Then there is nitrogen to press the activator into the activator hopper, and there will be VOCs emissions

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