Two-Stage Non-Catalytic Partial Oxidation for Ethylene Removal
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Solution Overview
Problem
Current methods for producing synthesis gas from biomass, organic waste, or plastic waste struggle with the removal of ethylene and other hydrocarbons, which can lead to catalyst deactivation and process inefficiencies, particularly in downstream synthesis steps.
Innovation Solution
A two-stage non-catalytic partial oxidation process is employed, where the initial low-temperature partial oxidation is followed by high-temperature partial oxidation to effectively remove ethylene and other hydrocarbons from the synthesis gas, increasing the yield of carbon monoxide and simplifying downstream processing by avoiding catalysts and reducing energy requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If high-temperature partial oxidation is used to remove ethylene and hydrocarbons, then ethylene content is reduced, but energy consumption increases
Solution Approach 1:
The gasification process is divided into two distinct stages: a first partial oxidation stage operating at lower temperature (800-1200°C) and a second partial oxidation stage operating at higher temperature (1200-1600°C). This segmentation allows the system to achieve thorough hydrocarbon removal in the second stage while managing energy consumption through the controlled progression from the first stage, rather than subjecting the entire process to high temperatures from the beginning.
Solution Approach 2:
The invention changes the temperature parameter progressively through two stages. The first stage operates at a moderate temperature range (800-1200°C) for initial gasification, then the second stage operates at a higher temperature range (1200-1600°C) specifically for ethylene removal. This parameter change strategy enables effective ethylene reduction while optimizing energy consumption by avoiding unnecessary high-temperature operation throughout the entire process.
2Reliability
If non-catalytic partial oxidation is used, then catalyst deactivation is avoided, but process complexity increases
Solution Approach 1:
The invention extracts and eliminates the catalyst component from the gasification process entirely by implementing non-catalytic partial oxidation in two stages. Instead of using a catalyst that would be exposed to ethylene and subsequently deactivated, the process relies on thermal reactions in two controlled oxidation stages. This extraction of the catalyst element solves the deactivation problem but introduces the complexity of managing two distinct reaction stages with different temperature and oxygen conditions.
3Productivity
If two-stage partial oxidation is implemented, then ethylene removal efficiency is improved, but device complexity increases
Solution Approach 1:
The gasification system is segmented into two functional stages: a first partial oxidation stage for initial fuel conversion and a second partial oxidation stage for ethylene removal. Each stage has optimized temperature ranges and oxygen feed rates. This segmentation improves ethylene removal efficiency by dedicating the second stage specifically to this function, while the complexity is managed through systematic control of the two stages rather than a single complex reactor design.
Solution Approach 2:
The invention employs parameter changes across two stages to improve ethylene removal efficiency. The first stage operates at temperature T1 (800-1200°C) with oxygen feed rate O1, and the second stage operates at temperature T2 (1200-1600°C) with oxygen feed rate O2. These controlled parameter changes enable efficient ethylene conversion while managing process complexity through systematic parameter optimization rather than complex equipment design.
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 significantly reduces ethylene concentrations to safe levels for downstream processes, enhancing the hydrogen and carbon monoxide content in the synthesis gas, thus improving the efficiency and stability of subsequent chemical synthesis steps.
Implementation Method 1
non-catalytic low-temperature partial oxidation... to a first raw synthesis gas stream containing hydrogen, carbon monoxide, carbon dioxide and ethylene
Implementation Method 2
non-catalytic high-temperature partial oxidation... to a second raw synthesis gas stream which is depleted in ethylene and enriched in carbon monoxide
Data Source
Figure 1
AI summary
The invention relates to a process for producing a raw synthesis gas containing hydrogen and carbon oxides by non-catalytic partial oxidation of a carbon-containing feed stream comprising biomass and/or organic waste and/or plastic waste, wherein the raw synthesis gas produced has a significant ethylene content. According to the invention, the gasification of the carbon-containing feed stream is carried out in a first step under conditions of non-catalytic low-temperature partial oxidation at temperatures between 600 and 1100 °C, followed by a second step under conditions of non-catalytic high-temperature partial oxidation at temperatures above 1100 °C, which serves to convert ethylene and other hydrocarbons to synthesis gas products.