Partial Oxidation H2:CO Ratio Control for Waste Gasification
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Solution Overview
Problem
Conventional Waste-to-Liquids (WTL) and Biomass-to-Liquids (BTL) processes face inefficiencies and complexity due to the challenge of controlling the H2:CO ratio in the feedstock, particularly when handling fluctuating compositional characteristics of waste and biomass materials, which affects the production of synthetic fuels.
Innovation Solution
A process that involves gasifying carbonaceous feedstocks to produce raw synthesis gas, followed by partial oxidation to equilibrate the H2:CO ratio below the usage ratio, and subsequent treatment to generate fine synthesis gas, allowing for consistent production of synthetic fuels despite varying feedstock compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional WTL/BTL processes are used with steam reforming and full purification trains, then synthetic fuel can be produced from waste materials and biomass, but the process complexity and cost increase significantly
Solution Approach 1:
The invention extracts and eliminates the complex CO2 removal and H2S removal trains from conventional WTL/BTL processes. By using partial oxidation to directly produce synthesis gas with the required H2:CO ratio (2.0-3.0:1), the process removes unnecessary purification steps while maintaining consistent fuel production quality
Solution Approach 2:
The invention changes the key parameter of H2:CO ratio control by using partial oxidation instead of steam reforming. This parameter change allows direct production of synthesis gas with the optimal H2:CO ratio for Fischer-Tropsch synthesis, eliminating the need for downstream ratio adjustment and complex purification equipment
2Productivity
If the H2:CO ratio in synthesis gas is not controlled, then the conversion process can operate with variable feedstock, but the usage efficiency decreases and additional processing steps are required
Solution Approach 1:
The invention performs preliminary action by controlling the H2:CO ratio during the partial oxidation step before the synthesis gas enters the Fischer-Tropsch converter. By pre-adjusting the ratio to the optimal range (2.0-3.0:1) through controlled partial oxidation, the process eliminates the need for downstream ratio adjustment steps and improves overall conversion efficiency
Solution Approach 2:
The invention maintains continuous useful action by integrating H2:CO ratio control directly into the partial oxidation process flow. The synthesis gas is produced with the correct H2:CO ratio in a continuous manner, allowing uninterrupted efficient conversion without intermittent purification or ratio adjustment steps
3Adaptability or versatility
If different feedstock materials with fluctuating compositions are used, then the process versatility improves, but the H2:CO ratio control becomes difficult and requires additional adjustment steps
Solution Approach 1:
The invention applies universality by using partial oxidation as a multi-functional process that simultaneously handles diverse feedstock materials (waste plastics, biomass, municipal solid waste) and directly produces synthesis gas with consistent H2:CO ratio (2.0-3.0:1). This single process step replaces multiple feedstock-specific preparation and ratio adjustment steps
Solution Approach 2:
The invention uses parameter changes in the partial oxidation process to maintain consistent H2:CO ratio despite varying feedstock composition. By controlling oxidation conditions (temperature, oxygen feed rate, residence time), the process dynamically adjusts to different feedstocks while maintaining the target H2:CO ratio range, eliminating the need for downstream ratio adjustment
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 stabilizes the H2:CO ratio in the equilibrated synthesis gas, reducing the need for additional downstream processing steps and enhancing the efficiency and consistency of synthetic fuel production, even with fluctuating feedstock compositions.
Implementation Method 1
gasifying in a gasification zone at least part of the first carbonaceous feedstock material to produce a first raw synthesis gas
Implementation Method 2
partially oxidising in a partial oxidation zone at least part of the first raw synthesis gas to produce a first equilibrated synthesis gas having a first equilibrated synthesis gas H2:CO ratio
Data Source
AI summary
The present invention provides a process for the manufacture of a useful product from carbonaceous feedstock of fluctuating compositional characteristics, the process comprising the steps of: continuously providing the carbonaceous feedstock of fluctuating compositional characteristics to a gasification zone; gasifying the carbonaceous feedstock in the gasification zone to obtain raw synthesis gas; recovering at least part of the raw synthesis gas from the gasification zone and supplying at least part of the recovered raw synthesis gas to a partial oxidation zone; equilibrating the H2:CO ratio of the raw synthesis gas in the partial oxidation zone to obtain equilibrated synthesis gas; recovering at least part of the equilibrated synthesis gas from the partial oxidation zone and treating the gas to remove impurities and generate a fine synthesis gas; optionally adjusting the H2:CO ratio of at least part of the fine synthesis gas to obtain adjusted fine synthesis gas; and converting the optionally adjusted fine synthesis gas into the useful product in a further chemical reaction requiring a usage ratio; wherein the fine synthesis gas H2:CO ratio is below the usage ratio and wherein any optional adjustment of at least part of the fine synthesis gas H2:CO ratio is effective to increase the H2:CO ratio in the fine synthesis gas to a level at, nearer to or above the usage ratio; wherein the H2:CO ratio of the raw synthesis gas fluctuates during operation of the process as a result of the fluctuating compositional characteristics of the carbonaceous feedstock by a percentage of ±x; and the H2:CO ratio of the equilibrated synthesis gas does not fluctuate during operation of the process or fluctuates during operation of the process as a result of the fluctuating compositional characteristics of the carbonaceous feedstock by a percentage ±y, y being a lower percentage than x.