Autothermal Gasifier Reactor for High-Temperature Reducing Gas
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Solution Overview
Problem
Existing methods for gasifying and melting substances, such as waste and coal, face challenges including complex technology, high disposal costs, and the inability to utilize the discharged gases for metallurgical processes due to inadequate outlet temperatures.
Innovation Solution
A method involving a reactor with specific zones for pyrolysis, oxidation, and reduction, where a carbonaceous feedstock is heated to generate hot reducing gases with a CO/CO2 ratio ≥ 5, utilizing a co-current and countercurrent gas flow system to achieve temperatures above 1300°C, allowing for the conversion of thermal energy into chemical energy and the collection of metal and slag melts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional gasification processes are used, then waste disposal is achieved, but the technology becomes complex and disposal costs increase
Solution Approach 1:
The reactor is divided into distinct functional zones (pyrolysis zone, oxidation zone, reduction zone) that operate simultaneously. This segmentation allows each zone to perform its specific function efficiently, simplifying the overall process design while maintaining effectiveness in waste gasification and energy recovery.
Solution Approach 2:
The patent combines multiple processes (pyrolysis, oxidation, and reduction) into a single integrated reactor system. By merging these processes that occur simultaneously in different zones of the same reactor, the system achieves complex waste treatment and gas generation without requiring multiple separate units, thereby reducing overall system complexity and disposal costs.
2Temperature
If conventional gasification processes are used, then waste treatment is achieved, but the discharged gases cannot be used for metallurgical processes due to insufficient temperature
Solution Approach 1:
The patent fundamentally changes the thermal parameters of the gasification process by implementing an autothermal design with internal oxygen injection. This creates extremely high temperatures (exceeding 1500°C) within the reactor, transforming the thermal state of the discharged gases from insufficient to highly suitable for metallurgical applications such as direct injection into blast furnaces or steelmaking processes.
Solution Approach 2:
The reactor is designed to be self-heating through autothermal gasification, where the oxidation zone generates heat that directly sustains the pyrolysis and reduction zones. This self-service thermal generation eliminates the need for external heating systems and produces high-temperature gases inherently suitable for metallurgical use, enhancing gas productivity and utilization.
3Temperature
If high temperature gasification is implemented, then hot reducing gases are generated, but the reactor requires sophisticated zone management and oxygen injection systems
Solution Approach 1:
The patent applies local quality by creating distinct thermal and chemical environments in different spatial zones of the reactor. The pyrolysis zone operates at high temperature with limited oxygen, the oxidation zone introduces oxygen for combustion, and the reduction zone maintains reducing conditions. This localized differentiation of conditions enables high temperature operation while managing complexity through clear zonal functional separation.
Solution Approach 2:
The patent uses the gas flow itself as an intermediary that connects and balances the different zones. The syngas produced in the pyrolysis zone serves as both the product and the reducing medium for the reduction zone, while the heat generated in the oxidation zone serves as the energy source for the entire system. This intermediary role of the gas flow simplifies zone management by creating intrinsic connections between zones.
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 enables efficient gasification and melting with reduced pollutant load, lower costs, and the generation of high-temperature reducing gases suitable for metallurgical applications, enhancing material and energy recovery.
Implementation Method 1
heating the discharge bed in the pyrolysis zone to initiate pyrolysis in the carbonaceous feedstock material and to form a pyrolysis product
Implementation Method 2
gasifying the pyrolysis product and remaining un-pyrolyzed carbonaceous feedstock material, if any remains, in the hot upper oxidation zone
Implementation Method 3
converting thermal energy into chemical energy in the upper reduction zone
Implementation Method 4
providing a lower lying hot lower oxidation zone in the reactor by supplying a source of oxygen at a temperature of at least 800°C to the reactor at a location beneath a lower reduction zone of the reactor; collecting any metal and/or slag melts present in the lower oxidation zone
Data Source
Figure 1
Figure 2~3
AI summary
This invention relates to a method and a reactor for gasifying a carbonaceous feedstock material. The method includes the steps of choke-feeding a carbonaceous feedstock material into a pyrolysis zone of the reactor to form a discharge bed; heating the discharge bed to initiate pyrolysis of the feedstock material to form a pyrolysis product; providing a lower lying upper oxidation zone; gasifying the pyrolysis product to form a bed of char; converting thermal energy into chemical energy in an upper reduction zone; providing a lower lying lower oxidation zone; collecting any metal slag and/or slag melts in the lower oxidation zone; and discharging hot reducing gases having a temperature of at least 1300°C and a CO/CO2 ratio of ≥ 5, more preferably ≥ 15.