Granular Polymer Drying Plant With Process Gas Purification
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Solution Overview
Problem
Existing drying plants for granular polymer materials, particularly those containing recycled polyethylene terephthalate (rPET), suffer from high chemical impurities like benzene, acetaldehyde, and residual oils, which compromise product quality and emit pollutants, while being inefficient and complex.
Innovation Solution
A drying plant with a process gas circuit that includes a dehumidification and heating unit, a purification group with a condenser and activated carbon filter, and a cyclone separator to remove contaminants, optimizing energy efficiency and reducing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional drying plant uses a closed process gas circuit with recirculation, then energy efficiency is improved, but chemical impurities (benzene, acetaldehyde, residual oils) accumulate in the process gas and compromise product quality
Solution Approach 1:
The invention extracts harmful chemical impurities (benzene, acetaldehyde, residual oils) from the recirculating process gas using a purification system comprising a condenser and activated carbon filter, while maintaining the energy-efficient closed circuit configuration
Solution Approach 2:
The purification system acts as an intermediary between the drying chamber and the dehumidification unit, removing chemical impurities from the process gas before it enters the dehumidification stage, thereby preventing contamination accumulation
2Loss of energy
If the process gas is continuously circulated without purification, then energy consumption is reduced, but the quality of the dried polymer material deteriorates due to contaminant accumulation
Solution Approach 1:
The purification system extracts chemical contaminants from the recirculating process gas, enabling continuous circulation without quality degradation
Solution Approach 2:
The system discards harmful chemical impurities through the purification system while recovering and recirculating the cleaned process gas, maintaining both energy efficiency and product quality
3Manufacturing precision
If a purification system is added to remove chemical impurities, then product quality is improved, but device complexity increases
Solution Approach 1:
The invention merges the purification function into the existing process gas circuit by positioning the purification system between the drying chamber and the dehumidification unit, utilizing the same gas flow path without requiring separate purification circuits
Solution Approach 2:
The process gas circuit serves multiple functions: drying the polymer material, dehumidifying the process gas, and purifying it from chemical impurities, thereby reducing the need for separate dedicated systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The plant effectively reduces chemical impurities in rPET, enhancing product quality and minimizing pollutant emissions, with improved energy performance and simplified construction.
Implementation Method 1
a condenser (32) which is configured to cool the process gas to a predefined condensation temperature of the contaminating substances so as to separate from the process gas the contaminating substances condensed in this manner
Implementation Method 2
a filter (33) which is positioned at the outlet from the condenser (32) and which contains activated carbon capable of absorbing any non-condensed contaminating substances
Implementation Method 3
a dehumidification and heating unit (20) which is configured to dehumidify and heat the process gas to predefined humidity and temperature values for supply to the hopper (2), respectively
Data Source
Figure 1
Figure 2
AI summary
A plant for drying granular polymer material comprises a hopper, in which granular polymer material is dried, and a process gas circuit which is configured to supply a process gas to the hopper in order to dry the granular polymer material.