Tar Reformer Catalyst Regeneration via Gas Recycling
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Solution Overview
Problem
Catalyst deactivation and high energy consumption in tar reformers due to carbon coke and dust buildup, which requires controlled high-temperature oxidative burn-off and substantial steam consumption, posing challenges in maintaining catalyst performance and efficiency.
Innovation Solution
A process involving a main gas stream with controlled oxygen content and temperature, recycled to control temperature development and reduce energy consumption, using a flue gas with natural steam content instead of dedicated steam generation, and adjusting oxygen content through additional oxidant gas streams to manage carbon combustion effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature oxidative burn-off is used to remove carbon coke and dust from catalyst, then catalyst performance is restored, but temperature control becomes difficult and energy consumption increases
Solution Approach 1:
The patent implements a feedback control system where the gas stream exiting the reformer is recycled back to the inlet. This recycle stream acts as a feedback mechanism that automatically modulates the oxygen and temperature conditions within the reformer, preventing temperature runaways while maintaining effective carbon removal and catalyst regeneration
Solution Approach 2:
The patent changes the oxygen content parameter by blending the recycled oxygen-depleted gas with fresh gas streams. This parameter adjustment allows precise control of combustion intensity during catalyst regeneration, enabling effective carbon coke removal while maintaining safe temperature levels
2Reliability
If high-temperature oxidative burn-off is used to remove carbon coke and dust from catalyst, then catalyst performance is restored, but energy consumption increases
Solution Approach 1:
The system uses its own output stream (oxygen-depleted gas) as part of its input, creating a self-regulating cycle. The heat generated by carbon combustion is retained within the system through recycling, reducing the need for external energy input while maintaining effective regeneration temperatures
Solution Approach 2:
The patent converts the harmful exothermic combustion reaction into a beneficial heat source. The heat normally considered a risk for temperature runaway is instead utilized to maintain regeneration temperatures, reducing external energy requirements while the recycle system prevents overheating
3Reliability
If substantial steam consumption is used for catalyst regeneration, then carbon combustion is effective, but operational costs increase
Solution Approach 1:
The gas stream performs multiple functions simultaneously: it provides oxygen for carbon combustion, serves as a heat transfer medium, and acts as a diluent to control reaction intensity. This multi-functionality eliminates the need for dedicated steam injection while achieving effective catalyst regeneration
Solution Approach 2:
The patent changes from steam-based regeneration to oxygen-controlled combustion using recycled gas. This parameter change in the regeneration medium eliminates substantial steam consumption while maintaining effective carbon removal through controlled oxidative burn-off
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 effectively controls temperature and reduces energy consumption, prolonging catalyst life and minimizing the risk of temperature runaways while reducing steam usage and operational costs.
Implementation Method 1
controlled high-temperature oxidative burn-off
Implementation Method 2
regeneration of a catalyst within a tar reformer
Implementation Method 3
The temperature of the main gas stream at the inlet is controlled to be within the range from about 500°C to about 1000°C
Implementation Method 4
recycling at least a part of the oxygen depleted gas exiting from the tar reformer back into the main gas stream upstream the tar reformer
Data Source
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AI summary
The invention relates to a catalyst regeneration process for a tar reforming catalyst within a catalyst bed in a tar reformer. The process comprises the steps of: -Admitting a main gas stream with controlled temperature and oxygen content to an inlet into the tar reformer; -Passing the main gas stream through the catalyst bed to form an oxygen depleted gas stream; -Exiting the oxygen depleted gas stream from the tar reformer; and -Recycling at least a part of the oxygen depleted gas stream exiting from the tar reformer back into said main gas stream upstream said tar reformer. The temperature of said main gas stream at the inlet is controlled to be within the range from about 500˚C to about 1000˚C.