Acute-Angle Gas Mixing for Syngas Reactors
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Solution Overview
Problem
Current industrial processes for converting methane to syngas, such as steam reforming, face challenges with energy efficiency and capital investment, and the partial oxidation process requires careful mixing of feed gases to prevent premature reactions and ensure efficient catalytic conversion, which is difficult to achieve with existing gas injection technologies.
Innovation Solution
A reactor system with a gas mixing apparatus that includes channels with specific injection portions for methane and oxygen-containing gases, where the oxygen gas is injected at an acute angle to the methane flow, allowing for thorough mixing and minimizing premature reactions by controlling the residence time and distribution across the catalyst surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gas injection methods are used for partial oxidation, then mixing can be achieved, but premature reactions and combustion occur due to inadequate control of gas distribution and residence time
Solution Approach 1:
The gas mixing apparatus divides the gas injection process into separate injection portions for different feed gases (hydrocarbon and oxygen-containing gas). Each gas is injected through dedicated inlets at different locations and angles within the channel, segmenting the mixing process to control residence time and prevent premature combustion before the catalyst bed.
Solution Approach 2:
The apparatus creates different local conditions within the channel by injecting gases at specific locations and angles. The hydrocarbon gas is injected at one location while the oxygen-containing gas is injected at a different location and at an acute angle (10-85 degrees), creating localized mixing zones that control reaction timing and prevent premature combustion.
2Productivity
If steam reforming is used for methane conversion, then syngas production is achieved, but energy efficiency is low and capital investment is high due to large plant size and long residence times
Solution Approach 1:
The apparatus enables partial oxidation instead of steam reforming by changing the process parameters - using oxygen-containing gas instead of steam, and controlling the mixing and residence time in the channel. This parameter change reduces the required residence time from seconds to milliseconds, allowing smaller reactor sizes and improved energy efficiency while maintaining syngas production.
3Productivity
If feed gases are mixed thoroughly before entering reaction zone, then efficient catalytic conversion is achieved, but premature combustion occurs due to extended mixing time
Solution Approach 1:
The apparatus introduces a spatial dimension to the mixing process by injecting gases at an acute angle (10-85 degrees) relative to the channel axis. This angular injection creates a three-dimensional mixing pattern within the channel that achieves thorough mixing before the catalyst bed without requiring extended axial mixing distance, thereby preventing premature combustion.
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 enables efficient mixing and preheating of feed gases, reducing unwanted reactions and achieving a desired H2:CO ratio, leading to improved energy efficiency and smaller reactor sizes for syngas production, while maintaining the catalyst's integrity and optimizing product selectivity.
Implementation Method 1
at least one acutely-aligned inlet for injecting a second feedgas into the channel... allowing for thorough mixing and minimizing premature reactions by controlling the residence time
Implementation Method 2
the syngas is converted to higher hydrocarbon products by processes such as the Fischer-Tropsch synthesis... heterogeneously catalyzed partial oxidation
Implementation Method 3
catalytic partial oxidation (CPOX) or direct partial oxidation of hydrocarbons (e.g., natural gas or methane) to syngas... The net partial oxidation of methane yields a syngas mixture with a H2:CO ratio of 2:1
Implementation Method 4
minimizing premature reactions by controlling the residence time and distribution across the catalyst surface
Data Source
AI summary
Embodiments include methods and apparatus for mixing feedgases and producing synthesis gas. The apparatus includes a vessel containing a mixing system comprising one or more channels and a reaction zone downstream of the mixing system. A first feedgas and a second feedgas are separately injected into different injection portions of each channel, such that the second feedgas is injected in an acute direction into the first feedgas flowstream. The injected feedgases thereafter mix in a mixing portion of the channel. The mixing portion of each channel may have a reduced cross-sectional area so as to increase the total velocity of the feedgases while they mix. A feedgas mixture exits each channel of the mixing system to feed the reaction zone where it gets converted. Preferred embodiments include mixing O2 with a hydrocarbon gas and converting the mixture in a catalytic reaction zone to produce synthesis gas.