Pyrolysis Gas Condenser with Wiping Mechanism
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Solution Overview
Problem
The processing of plastic waste pyrolysis gas often results in clogging of systems due to heavy, waxy components and tar deposits, which reduce heat transfer and cause equipment fouling, necessitating costly and labor-intensive maintenance.
Innovation Solution
A method involving a plastic waste pyrolysis gas stream is cooled and transferred to a condensing means operating at a lower temperature, with continuous wiping or scraping of inner surfaces to prevent clogging, and separation into liquid and gaseous fractions, ensuring efficient heat transfer and product yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional heat exchangers are used to condense the pyrolysis gas, then condensation of the gaseous product mixture is achieved, but deposits form on the heat transfer surfaces causing clogging and reduced heat transfer efficiency
Solution Approach 1:
The heat exchanger is divided into multiple segments or zones with different surface characteristics. Some zones have smooth surfaces while others have textured or coated surfaces that prevent deposit adhesion, allowing different portions of the exchanger to handle different aspects of the condensation process without mutual interference
Solution Approach 2:
The heat exchanger incorporates movable or adjustable components that allow the surface properties to change dynamically. This could include adjustable flow distributors, movable cleaning elements, or surfaces that can change their thermal conductivity or geometry in response to operating conditions to prevent deposit formation
2Object-affected harmful factors
If spray condensers are used to avoid clogging, then separation efficiency is reduced and protection against coke deposits is lost
Solution Approach 1:
An intermediary substance or surface treatment is introduced between the pyrolysis gas and the heat exchanger surfaces. This could be a protective coating, a sacrificial layer, or a chemical additive that prevents direct contact between the deposit-forming components and the heat transfer surfaces, thereby maintaining both clogging prevention and separation efficiency
3Reliability
If liquid recycling is used in condensers, then fire load is significantly increased and product quality is reduced due to additional thermal reactions
Solution Approach 1:
The harmful liquid recycle loop is extracted or eliminated from the system. Instead of recycling liquid through the condenser, the system uses alternative methods such as direct gas-phase condensation, inert gas blanketing, or rapid quenching that achieve equipment protection without creating a fire-prone liquid reservoir or exposing products to prolonged thermal stress
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 method effectively prevents clogging and maintains heat exchanger performance by removing heavy components, reducing fouling and ensuring continuous operation without the need for duplicate equipment.
Implementation Method 1
transferring the plastic waste pyrolysis gas stream to a condensing means, wherein temperature in the condensing means is 100-300°C to produce a condensed fraction and a gaseous fraction
Data Source
AI summary
The present disclosure relates to methods for processing plastic waste pyrolysis gas, such as methods wherein clogging of the systems used in the method is avoided or at least alleviated.