Heat Integration of Pyrolysis Effluent with Non-Aqueous Medium
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Solution Overview
Problem
Waste plastic pyrolysis facilities combined with cracking facilities often have a high carbon footprint due to inefficient heat management, leading to increased global warming potential despite producing recycled content products.
Innovation Solution
A chemical recycling process that involves pyrolyzing waste plastic, heating a non-aqueous heat transfer medium with pyrolysis effluent, and using this medium to preheat waste plastic upstream of the pyrolysis reactor, thereby recycling residual heat energy back into the process to optimize energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If waste plastic pyrolysis facilities are combined with cracking facilities to produce recycled content products, then productivity and product output are improved, but the carbon footprint and global warming potential increase due to inefficient heat management
Solution Approach 1:
The patent combines the pyrolysis facility and cracking facility into an integrated complex where heat from the pyrolysis effluent is directly utilized to preheat feedstock for the cracking process. This merging of thermal management systems eliminates standalone heating requirements and reduces overall energy consumption across both facilities.
Solution Approach 2:
The hot pyrolysis effluent, which would normally be a waste heat stream contributing to carbon footprint, is converted into a useful heating medium. This effluent is used to preheat the waste plastic feedstock before it enters the pyrolysis reactor, transforming a harmful thermal waste into a beneficial energy source that reduces external fuel requirements.
2Ease of operation
If traditional heat management is used in combined pyrolysis and cracking facilities, then operational simplicity is maintained, but energy efficiency deteriorates leading to higher carbon emissions
Solution Approach 1:
The system implements self-service heat management where the pyrolysis process itself provides the heat required for its own feedstock preparation. The hot effluent from pyrolysis automatically serves to preheat the incoming waste plastic, creating a self-sustaining thermal cycle that reduces dependence on external energy sources and complex utility systems.
Solution Approach 2:
Instead of discarding the thermal energy in the pyrolysis effluent to flares or cooling systems, the patent recovers this waste heat and redirects it to preheat the feedstock. This recovery system captures what would otherwise be lost energy and puts it to productive use, improving overall energy efficiency without adding significant operational complexity.
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
This approach significantly reduces the carbon footprint and global warming potential of the combined facilities by efficiently reusing heat energy, enhancing the environmental sustainability of the recycling process.
Implementation Method 1
heating a non-aqueous heat transfer medium (HTM) via indirect heat exchange with at least a portion of the pyrolysis effluent
Implementation Method 2
heating at least a portion of the waste plastic upstream of the pyrolysis reactor with at least a portion of the heated non-aqueous HTM via indirect heat exchange
Implementation Method 3
pyrolyzing waste plastic in a pyrolysis reactor to thereby provide a pyrolysis effluent
Data Source
AI summary
A heat integration process and system for a chemical recycling facility is provided that can lower the carbon footprint and global warming potential of the facility. More particularly, one or more heat transfer media may be used to recover heat energy from a waste plastic pyrolysis effluent and redistribute the recovered heat energy throughout the chemical recycling facility. Thus, the global warming potential of the chemical recycling facility may be optimized and lowered due to the heat integration process and system herein.