Side Feed Centre Ash Dump Gasifier
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Solution Overview
Problem
Conventional gasification systems face difficulties in fuel delivery and ash removal, particularly with high ash fuels, which has hindered the effective and cost-effective use of biomass energy in small and medium-sized energy recovery systems.
Innovation Solution
A method and apparatus involving a primary oxidation chamber with a refractory-lined surface and a converging upper portion for efficient gasification, along with air distribution members and an ash removal system, which facilitates even gasification and separates ash from the gaseous effluent, allowing for a secondary oxidation chamber to further oxidize the effluent for thermal energy recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gasification systems are used, then fuel delivery and ash removal can be achieved, but difficulty arises especially with high ash fuels and fuels with low ash melting temperatures
Solution Approach 1:
The gasifier is divided into multiple functional chambers: a primary oxidation chamber for fuel gasification, a secondary oxidation chamber for effluent oxidation, and a separate ash removal system. This segmentation allows each chamber to be optimized for its specific function, particularly the primary chamber's ability to handle high ash fuels effectively.
Solution Approach 2:
A refractory material lining is introduced as an intermediary layer within the primary oxidation chamber. This refractory lining protects the chamber structure from thermal damage and facilitates catalytic oxidation of the fuel, enabling reliable operation with high ash fuels that would otherwise damage conventional systems.
2Use of energy by moving object
If biomass energy recovery systems are implemented, then energy recovery from organic materials is achieved, but higher capital cost precludes successful use in small or medium size systems
Solution Approach 1:
The system is segmented into two oxidation chambers that can operate independently or in sequence. The primary oxidation chamber handles the bulk fuel gasification, while the secondary chamber processes the effluent. This modular segmentation reduces capital costs compared to single-chamber systems while maintaining effective energy recovery.
Solution Approach 2:
The system operates at medium to low rates rather than requiring high-rate processing. By adjusting the operational parameters to match the capabilities of small and medium systems, the design achieves cost-effective energy recovery without requiring the expensive infrastructure of large-scale systems.
3Productivity
If air distribution members are used to promote evenly distributed gasification, then gasification efficiency is improved, but device complexity increases
Solution Approach 1:
Perforated air distribution members are used in the primary oxidation chamber floor. These perforated structures distribute air evenly throughout the fuel bed through their porous design, promoting uniform gasification without requiring complex mechanical air distribution systems. The simplicity of perforated members achieves the desired gasification efficiency.
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
Enables cost-effective energy recovery from biomass materials at medium to low rates, suitable for small and medium-sized applications, by efficiently gasifying organic materials and utilizing the thermal energy produced for heating or mechanical engines.
Implementation Method 1
an inner surface lined with a refractory material to promote catalytic oxidation of the solid organic materials
Implementation Method 2
introduce air into the interior of the fuel bed to thereby promote evenly distributed gasification
Implementation Method 3
a converging upper portion, the latter to facilitate mixing of gaseous material in the chamber
Implementation Method 4
means for the removal of the residue of the fuel, that is, the materials such as ash left in the primary oxidation chamber
Data Source
AI summary
An apparatus for gasifying solid organic fuel includes a refractory-lined oxidation chamber, fuel storage, a transfer connecting the fuel storage with an inlet into the oxidation chamber for transferring in an upwardly inclined direction the solid fuel from the fuel storage into the inlet to form an upwardly mounded fuel bed. An oxidant is supplied into the fuel bed to gasify the organic materials in the fuel to produce a gaseous effluent from the fuel bed, thereby leaving a residue of the fuel. The residue drops through an opening under the oxidation chamber onto a residue removal transfer. The oxidant is supplied through a plurality of perforated air distribution members extending across the fuel bed cavity in the oxidation chamber so as to introduce air into the interior of the fuel bed to thereby promote evenly distributed gasification, evenly distributed through the fuel bed.