Moving Bed Gasifier Segmentation for Complete Waste Decomposition
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Solution Overview
Problem
Existing gasification technologies for waste materials do not achieve complete decomposition, leading to incomplete utilization of waste products and potential environmental pollution.
Innovation Solution
A moving-bed gasifier design with a gasification space and foot, featuring a carburetor dome, agitator tools, and a segmented annular gap, which ensures complete conversion of waste products into synthesis gas by maintaining temperature and preventing overfilling through a conveying device, allowing for efficient ash and slag removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a shaft-like reactor with cocurrent downflow is used for gasification, then the structure is simple and easy to operate, but the degassing and gasification of solid fuels is not complete
Solution Approach 1:
The gasifier is divided into multiple functional zones: a combustion zone at the bottom where air reacts with carbon, a gasification zone in the middle where steam reacts with carbon, and a cooling zone at the top. This segmentation allows each zone to perform its specific function optimally, ensuring complete gasification while maintaining operational simplicity.
Solution Approach 2:
Different regions of the gasifier are provided with different qualities: the bottom combustion zone has high oxygen concentration for intense heat generation, the middle gasification zone has controlled steam-carbon reaction conditions, and the top cooling zone has lower temperature for tar cracking. This local differentiation ensures complete decomposition of waste materials.
2Reliability
If a shaft-like reactor with countercurrent process is used, then thermal process stability is improved, but deposits form in the center and gasification is not complete
Solution Approach 1:
The gasifier employs a moving bed design where the charge material continuously moves downward through the reactor. This dynamic movement prevents material from stagnating in any single location, eliminating deposit formation in the center while maintaining thermal process stability through continuous heat exchange between the moving charge and the reactor walls.
3Productivity
If the gasifier pot is filled with waste products, then productivity increases, but overfilling occurs and temperature control is compromised
Solution Approach 1:
A level detection system monitors the charge material level in the gasifier pot and provides feedback to the feeding mechanism. When the material reaches a predetermined level, the feeding automatically stops or reduces, preventing overfilling while maintaining optimal productivity. This feedback control ensures temperature stability by maintaining the correct charge height for efficient heat transfer.
4Device complexity
If conventional gasification methods are used, then the process is simple, but residual products require special disposal measures and cause pollution
Solution Approach 1:
The gasifier employs controlled oxidation in the combustion zone where air reacts with carbon at high temperatures to generate the heat required for complete gasification. This intense oxidation process ensures that organic compounds in the waste material are completely decomposed, converting them to synthesis gas (CO, H2, CO2) rather than leaving behind polluting residues, thereby eliminating the need for special disposal measures.
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 moving-bed gasifier achieves nearly complete conversion of waste products into synthesis gas, reducing pollution and the need for special disposal measures by ensuring thorough thermal decomposition and effective ash and slag management.
Implementation Method 1
thermal decomposition of waste products and waste materials, after degassing and/or gasification process (pyrolysis)
Implementation Method 2
The carburetor dome (17), which can be closed and/or perforated, serves to keep the temperature in the central radiation zone constant through reflection
Implementation Method 3
The carbonaceous particles that have not yet reacted and the raw gas that has not reacted react almost completely to form synthesis gas
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
The invention relates to a moving bed carburetor and to a method for operating the same in an arrangement for the thermal decomposition of waste products and waste materials. The present invention addresses the problems of providing a moving bed carburetor and a method for operating the same in an arrangement for the thermal decomposition of waste products and waste materials, which avoid the disadvantages of the prior art. The problems are solved in that the carburetor comprises a carburetor space and a carburetor base, wherein the carburetor free space is surrounded by a carburetor jacket and at the one, closed end has a synthesis gas outlet and via the second, open end thereof is connected to the carburetor base by way of the carburetor jacket. In the carburetor free space, a carburetor dome is arranged such that a gap is generated between the carburetor dome and the carburetor jacket and/or carburetor body. On the inside, the carburetor base is configured as a carburetor body into which a feed apparatus and at least one supply duct lead and which comprises a bottom provided with recesses opposite of the carburetor space, wherein the bottom ends in a central shaft. Said carburetor body is equipped with agitator tools which are rotatably mounted in the carburetor body by way of an agitator shaft, wherein the agitator shaft is surrounded by a delivery device, which serves as a kind of overflow for the possibly overfilled carburetor body.