Catalyst Preburner for Fuel Processing Start-Up
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Solution Overview
Problem
The start-up of natural gas catalyst burners in fuel processing applications requires significant preheated air or electrical power, and existing systems face challenges in efficiently burning both liquid and gas fuels in a single unit, leading to design and operational issues.
Innovation Solution
Incorporating a catalyst preburner upstream of the catalyst burner to convert raw fuels into a hydrogen-rich gas mixture, which reduces heating requirements and allows for efficient combustion with a lower oxygen-to-carbon ratio, enabling high fuel conversion and eliminating the need for dual fuel capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a natural gas catalyst burner is used directly, then fuel combustion can be achieved, but significant preheated air or electrical power is required for start-up
Solution Approach 1:
The patent introduces a preburner that performs preliminary combustion of natural gas before the main catalyst burner operation. This preburner operates at lower temperatures and converts natural gas to a hydrogen-rich gas mixture, which then serves as fuel for the main catalyst burner. This preliminary action eliminates the need for significant preheated air or electrical power during start-up of the main burner.
Solution Approach 2:
The patent divides the combustion system into two separate units: a preburner for initial fuel conversion and a main catalyst burner for primary combustion. This segmentation allows each unit to be optimized for its specific function, with the preburner handling the difficult start-up phase and the main burner handling efficient combustion, thereby reducing overall energy requirements.
2Adaptability or versatility
If a single catalyst burner handles both liquid and gas fuels, then fuel processing capability is maintained, but design complexity increases
Solution Approach 1:
The patent extracts the liquid fuel handling function from the main catalyst burner by introducing a separate preburner that specifically handles liquid fuel conversion. The preburner converts liquid fuel to a hydrogen-rich gas that is then fed to the main catalyst burner, which only needs to handle gas phase combustion. This extraction simplifies the main burner design while maintaining overall fuel processing versatility.
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
The use of a catalyst preburner reduces heating needs, enhances fuel conversion efficiency, and simplifies the design by allowing separate handling of liquid and gas fuels, eliminating the risk of explosive mixtures outside the reaction zone.
Implementation Method 1
the catalyst preburner, using an oxygen to carbon ratio of less than 1 results in some hydrogen being present in the gas mixture from partial oxidation
Implementation Method 2
since hydrogen can light-off at about 4O0C, no heating of the air is required in the following catalyst burner
Data Source
AI summary
Methods of using a catalyst preburner upstream of a catalyst burner, such as an anode tailgas oxidizer (ATO), in fuel processing applications. The methods prepare a hydrogen containing gas mixture which can be effectively combusted in a single ATO. The catalyst preburner will convert raw fuels into a gas mixture including hydrogen. This hydrogen containing gas mixture then mixes with the required air flow and anode tailgas and off-gas from a pressure swing adsorption unit before being introduced into the catalyst burner. The methods address the start-ups needs of an ATO as well as the requirement that an ATO be able to burn both liquid and gas fuels in a single unit.