Bottom Product Oxidizer Using Porous Ceramics for HTW Gasification
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Solution Overview
Problem
The post-treatment of carbon-containing bottom products from fossil fuel gasification in HTW processes is hindered by high TOC content, making them unsuitable for landfilling and resulting in incomplete energy utilization and poor CO2 separation.
Innovation Solution
Introducing an oxidizing agent, such as CO2/steam, through open-pored ceramic elements like gas purging plugs or foam ceramics into the bottom product oxidizer below the fluidized bed to enhance carbon conversion and reduce TOC levels, ensuring the ash meets landfill class 2 criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bottom product is discharged directly from the HTW gasifier, then the process is simple, but the TOC content is too high for landfilling and energy utilization is incomplete
Solution Approach 1:
The bottom product undergoes preliminary oxidation treatment in the oxidizer before final disposal or utilization. oxidizing agents are introduced through porous ceramic elements to reduce TOC content in advance, making the ash suitable for landfilling or energy recovery without requiring more complex post-treatment processes
Solution Approach 2:
Porous ceramic elements (gas purging plugs, foam ceramics) serve as intermediaries to introduce oxidizing agents into the bottom product. These ceramic structures facilitate controlled oxidation by distributing the oxidizing agent uniformly throughout the bottom product, achieving TOC reduction without direct contact between the bottom product and complex treatment systems
2Use of energy by moving object
If external furnaces are used to treat the bottom product, then energy utilization improves, but the device complexity and cost increase
Solution Approach 1:
The oxidation function is merged directly into the bottom product discharge system of the HTW gasifier. The oxidizer is integrated into the existing gasifier structure, combining the bottom product discharge and oxidation functions in one unit, thereby improving energy utilization without requiring separate external furnaces or complex treatment systems
Solution Approach 2:
The bottom product oxidation system uses the existing gasifier infrastructure and introduces oxidizing agents through simple porous ceramic elements. The system essentially treats its own bottom product using minimal additional components, achieving energy recovery without external furnaces or complex auxiliary equipment
3Device complexity
If CO2 separation is performed on bottom product with high TOC content, then the separation process is simpler, but the CO2 separation efficiency deteriorates
Solution Approach 1:
The bottom product undergoes preliminary oxidation to reduce TOC content before CO2 separation. This pre-treatment removes carbonaceous materials that would otherwise interfere with CO2 separation efficiency, ensuring high-purity CO2 recovery without requiring complex multi-stage separation processes
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 achieves extensive oxidation, reducing TOC levels in the ash to below 5%, enabling more efficient energy utilization and improved CO2 separation, while preventing ash agglomeration and ensuring compliance with landfill regulations.
Implementation Method 1
supplying an oxidizing agent by acting on open-pored ceramic elements such as gas purging plugs, foam ceramics or the like in a bottom product oxidizer below the fluidized bed
Implementation Method 2
achieves extensive oxidation, reducing TOC levels in the ash to below 5%
Implementation Method 3
introducing an oxidizing agent, such as CO2/steam, through open-pored ceramic elements like gas purging plugs or foam ceramics into the bottom product oxidizer
Data Source
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AI summary
The invention relates to a method and a device for post-treating C-containing base products produced during gassing of carbon-containing fossil fuels in an HTW method, in the direction of gravity downstream of the fluidised layer. According to said method and device, a more extensive oxidation is achieved using simple means in order to increase the carbon conversion in HTW gasifiers. This is achieved by supplying an oxidation agent impacting upon open-pored, ceramic elements (15 - 20), such as gas rinsing stones, foam ceramics or similar in a base product oxidator (2).