Two-Stage Pyrolysis for Waste Valorization
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Solution Overview
Problem
Existing pyrolysis methods for waste material only optimally extract biogenic combustible gases, leaving behind unutilized synthetic combustible gases and inefficiencies in energy and product quality.
Innovation Solution
A method involving two pyrolysis processes in series, one at a lower temperature for biogenic gas extraction and another at a higher temperature for synthetic gas extraction, followed by condensation and staggered condensation to separate and utilize both gas fractions effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single pyrolysis process is used at low temperature, then biogenic gas extraction is optimized, but synthetic combustible gas remains unutilized and energy efficiency is reduced
Solution Approach 1:
The single pyrolysis process is segmented into two sequential pyrolysis processes operating at different temperature ranges. The first pyrolysis process operates at low temperature (200-400°C) to optimally extract biogenic combustible gas, while the second pyrolysis process operates at high temperature (400-800°C) to extract synthetic combustible gas from the remaining solid material. This segmentation allows each process to be optimized for its specific gas type, eliminating energy waste from unutilized synthetic gas.
Solution Approach 2:
The invention changes the temperature parameter between two sequential pyrolysis processes. The first process uses low temperature (200-400°C) optimized for biogenic gas extraction, while the second process uses high temperature (400-800°C) optimized for synthetic gas extraction. This parameter change enables complete utilization of different gas fractions from the waste material, maximizing overall energy efficiency.
2Quantity of substance
If pyrolysis is performed at low temperature only, then biogenic combustible gas is extracted, but product quality and calorific value are limited
Solution Approach 1:
The gas production process is segmented into two quality-differentiated streams. The first pyrolysis process at low temperature produces biogenic combustible gas with specific compositional characteristics, while the second pyrolysis process at high temperature produces synthetic combustible gas with different properties and higher calorific value. This segmentation allows each gas fraction to be optimized for its intended application, improving overall product quality.
Solution Approach 2:
By changing the temperature parameter from low (200-400°C) to high (400-800°C) between the two pyrolysis processes, the invention produces gases with different compositional qualities. The high-temperature pyrolysis generates synthetic gas with higher calorific value and different hydrocarbon composition, thereby improving product quality while maintaining substantial gas volume through the combined output of both processes.
3Loss of time
If waste material is not fully processed, then processing time is reduced, but valuable synthetic gas and pyrolytic crude oil are lost
Solution Approach 1:
The first pyrolysis process at low temperature serves as a preliminary action that extracts biogenic gas and prepares the solid residue for the second pyrolysis process. This preliminary extraction prevents potential loss of biogenic gas while the subsequent high-temperature pyrolysis recovers synthetic gas and pyrolytic crude oil that would otherwise be lost. The sequential arrangement ensures complete material utilization without excessive time investment.
Solution Approach 2:
The invention maintains continuity of useful action by immediately subjecting the solid residue from the first pyrolysis process to the second pyrolysis process at high temperature. This continuous processing ensures that no valuable synthetic gas or pyrolytic crude oil is lost, while the system operates efficiently without unnecessary idle time between processing stages.
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 enables the complete extraction and separation of biogenic and synthetic combustible gases, optimizing energy efficiency and product quality, and achieving self-sufficiency in energy and material utilization.
Implementation Method 1
the pyrolysis technique is widely known and used, understood as a thermal decomposition in the absence of oxygen, of matter having a carbonaceous base
Implementation Method 2
extracting the gas from pyrolysis, which can be subsequently used as fuel
Data Source
AI summary
A method for valorizing refuse material comprises a selective pyrolysis, based on: a first step of pyrolysis of the biogenic fraction, with at least one subsequent condensation step, and a second step of pyrolysis of the synthetic fraction with at least one subsequent condensation step; wherein the first and second pyrolysis steps are configured in series; wherein the first pyrolysis step is configured to extract at least a fraction of biogenic combustible gas which continues to the first condensation step, and a fraction of solid material that is transported to the second step of pyrolysis of the synthetic fraction, which is carried out at a higher temperature than the first pyrolysis step, and which is configured to obtain a fraction of synthetic combustible gas which continues to the second condensation step, and a fraction of solid material.