Reactor Segmentation for Syngas Production Without Preheating
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Solution Overview
Problem
The existing methods for converting natural gas to synthesis gas face challenges such as increased safety hazards and costs due to preheating the feedstock, which can lead to auto-ignition and reduced reactor performance, and there is a need for a more efficient and cost-effective process for producing syngas.
Innovation Solution
A reactor system with two reaction zones, one for combustion and one for partial oxidation, where the combustion effluent is mixed with the reaction feed in an inter-bed zone to generate synthesis gas, eliminating the need for preheating the feedstock and allowing for increased pressure, thereby reducing the risk of auto-ignition and improving economic efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the feedstock is preheated to initiate catalytic partial oxidation, then the reaction can be initiated and maintained, but the safety hazard increases due to auto-ignition risk and the cost increases
Solution Approach 1:
The reactor is divided into two distinct zones: a combustion zone for complete oxidation and a partial oxidation zone for syngas production. This segmentation allows the combustion zone to provide the necessary heat without requiring preheating of the feedstock, thereby eliminating auto-ignition hazards while maintaining reliable reaction initiation.
Solution Approach 2:
The combustion zone acts as an intermediary that provides thermal energy to the partial oxidation zone. Instead of preheating the feedstock directly, the combustion of a portion of the feed in the first zone creates hot effluent that serves as the heating medium for initiating and maintaining the partial oxidation reaction in the second zone.
2Productivity
If the pressure is increased to improve syngas production efficiency, then the productivity increases, but the risk of auto-ignition increases with preheating
Solution Approach 1:
By segmenting the reactor into combustion and partial oxidation zones, the system can operate at elevated pressures without preheating the entire feedstock stream. The combustion zone handles the high-pressure combustion safely, while the partial oxidation zone receives heat from the combustion effluent, maintaining productivity while reducing auto-ignition risk.
Solution Approach 2:
The invention changes the operational parameters by eliminating the preheating step and instead using in-situ heating from combustion effluent. This parameter change allows the system to operate at higher pressures with improved safety, as the feedstock is not exposed to high temperatures before entering the reaction zone.
3Temperature
If preheating is used to ensure adequate reaction temperature, then the reaction performance is maintained, but the cost increases and safety hazards arise
Solution Approach 1:
The combustion zone serves the partial oxidation zone by providing thermal energy through its hot effluent. This self-service approach eliminates the need for external preheating equipment and energy input, reducing manufacturing costs while ensuring adequate reaction temperature in the partial oxidation zone.
Solution Approach 2:
The combustion effluent acts as an intermediary heat transfer medium that carries thermal energy from the combustion zone to the partial oxidation zone. This intermediary approach ensures adequate reaction temperature without requiring expensive external preheating systems.
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 enhances the safety and efficiency of syngas production by eliminating the need for preheating, reducing the risk of auto-ignition, and allowing for higher pressure operations, leading to improved reactor performance and cost reduction.
Implementation Method 1
a first reaction zone (10) comprising a combustion catalyst, wherein said first reaction zone is operated at conditions sufficient to produce a combustion effluent comprising heat generated by the combustion of a fuel
Implementation Method 2
a second reaction zone (15) comprising a syngas catalyst, wherein said second reaction zone is operated at conditions sufficient for partially oxidizing said hydrocarbon-containing gas to a product stream comprising synthesis gas
Implementation Method 3
an inter-bed zone (58) located between said first reaction zone (10) and said second reaction zone (15), and adapted to receive said combustion effluent and said reaction feed
Implementation Method 4
said feed mix region allows for sufficient mixing of the combustion effluent with the reaction feed
Data Source
AI summary
The invention relates to reactor systems and processes for producing synthesis gas. In one embodiment, a reactor comprises a first reaction zone comprising a combustion catalyst, wherein the first reaction zone is operated at conditions sufficient to produce a combustion zone product comprising heat generated by the combustion of a fuel. The reactor further comprises a second reaction zone comprising a partial oxidation catalyst, wherein the second reaction zone is adapted to receive the combustion zone product and a reaction feed comprising a hydrocarbon gas. The second reaction zone is operated at conditions sufficient for partially oxidizing the hydrocarbon gas to a product stream comprising synthesis gas. The heat of combustion is transferred directly to the reaction feed by mixing it in a feed mix region located in the reactor between the first and second reaction zones, in such a manner that the reaction feed does not need preheating prior to entering the partial oxidation zone.