Hot Gas Filter Oxygen Injection for Wood Gasification Yield
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Solution Overview
Problem
Current wood gasification processes leave a significant portion of ungasified charcoal and ash, which requires proper disposal and reduces efficiency, with only 90% of the fuel being converted into usable gas, resulting in 5-10% waste by weight.
Innovation Solution
A device and method where the majority of ungasified charcoal from the gas generator is transported to a hot gas filter, where a second gasification step is initiated using oxygen, allowing for the complete gasification of charcoal and coal dust, reducing the residual ash to less than 1% of the fuel used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single-stage gasification process is used, then the process is simple and operational costs are low, but the gasification yield is limited to 90% leaving 5-10% waste by weight
Solution Approach 1:
The gasification process is divided into two distinct stages: a first gasification stage in the gas generator and a second gasification stage in the hot gas filter. This segmentation allows each stage to perform a specific function, with the first stage handling primary gasification and the second stage completing the gasification of remaining charcoal and coal dust, thereby increasing overall gasification yield from 90% to 95-99% while managing complexity through functional division
Solution Approach 2:
The first gasification stage performs preliminary gasification of the carbonaceous material before it reaches the hot gas filter. This preliminary action converts the majority of the material into combustible gases, preparing it for the second stage where remaining ungasified particles are completely gasified, thus optimizing the overall process efficiency and yield
2Loss of substance
If ungasified charcoal and ash are disposed of after single-stage gasification, then the process is simple to operate, but 5-10% of fuel is wasted requiring proper disposal
Solution Approach 1:
Instead of discarding the ungasified charcoal and ash from the first gasification stage, the invention recovers them by directing them to the hot gas filter for a second gasification stage. This recovery process converts the previously wasted 5-10% of fuel into usable combustible gases, increasing gasification yield to 95-99% and eliminating waste disposal requirements
Solution Approach 2:
The gasification process continues uninterrupted from the first stage to the second stage. The ungasified particles that would normally be discarded are continuously fed into the hot gas filter where gasification is completed, ensuring that the useful action of converting carbonaceous material to combustible gases continues until essentially 100% conversion is achieved, thereby eliminating waste
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 increases the gasification yield from 90% to 95-99%, significantly reducing waste and maintaining operational costs, with the additional cost of increased draft and oxygen supply being negligible.
Implementation Method 1
whereby a second gasification step is initiated using oxygen, allowing for the complete gasification of charcoal and coal dust
Implementation Method 2
At least the majority of the ungasified charcoal in the bottom area of the gas generator is transferred with the gas stream to the hot gas filter arranged subsequently, as has long been known in the conveyance of bulk materials
Data Source
Figure 1
AI summary
The invention relates to a device and a method for gasifying wood, comprising a gas generator (1) to which the material to be gasified and oxygen, usually in the form of air, are supplied, with the gasification taking place in a fixed-bed reactor. The product gas is drawn off via a product gas line (6) and introduced into a hot gas filter (2), where solids such as ungasified particles, ash, and foreign matter are separated by a filter, preferably equipped with filter cartridges (7), while the clean gas passes through and is discharged via a clean gas line (8). A vent (10) is provided in the bottom region of the hot gas filter (2) for the removal of the remaining solids. To increase the yield, the invention provides that oxygen, preferably in the form of air, is supplied to the hot gas filter (2) in its middle height region between the filter bottom (13) and the vent (10) via a line (12).