Steam-Hydrocarbon Reformer Steam Export Minimization
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Solution Overview
Problem
Current methods for generating hydrogen and synthesis gas through steam-hydrocarbon reforming often result in excess steam production, which can be costly and inefficient when there is no market for the excess steam, leading to reduced plant efficiency and increased capital expenditures.
Innovation Solution
A method that involves withdrawing a reformed gas mixture from catalyst-containing reformer tubes, forming specific streams for recycling and processing, and utilizing indirect heat exchange to generate and recycle steam within the process, minimizing steam export and maintaining overall plant efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If steam is exported to meet external demand, then steam supply reliability is improved, but capital expenditure on pipeline systems increases
Solution Approach 1:
The patent extracts only the necessary amount of steam from the reforming process for external supply, rather than exporting all generated steam. This is achieved by carefully balancing the steam-to-carbon ratio in the reforming reaction to produce just enough steam for both internal process needs and external customer requirements, thereby avoiding excessive capital expenditure on pipeline infrastructure.
Solution Approach 2:
The patent changes the steam-to-carbon ratio parameter in the steam-hydrocarbon reforming reaction to optimize steam generation. By adjusting this critical parameter, the process produces the exact amount of steam needed for internal use plus the required export amount, eliminating excess steam that would require expensive export infrastructure.
2Device complexity
If excess steam is vented or used inefficiently, then capital expenditure on steam export infrastructure is reduced, but plant efficiency decreases
Solution Approach 1:
The patent implements self-service by using the excess steam generated during reforming to preheat the feedstock or for other internal process purposes before any export. This internal utilization of steam reduces the need for external infrastructure while maintaining high plant efficiency, as the steam serves multiple functions within the facility itself.
Solution Approach 2:
The patent applies preliminary action by using a portion of the generated steam to preheat the hydrocarbon feedstock before it enters the reformer. This preheating step improves overall energy efficiency and reduces the net steam requirement for export, thereby reducing the need for expensive steam export infrastructure while maintaining high productivity.
3Reliability
If steam export is implemented, then steam supply to external customers is improved, but constraints on plant location increase
Solution Approach 1:
The patent extracts only the minimum necessary steam for external supply by optimizing the reforming process parameters. This selective extraction approach allows the plant to serve external customers while maintaining location flexibility, as the reduced steam export requirement minimizes the impact of distance on operational efficiency.
Solution Approach 2:
The patent applies partial action by exporting only the necessary amount of steam for customer requirements rather than all generated steam. This partial export approach reduces the length and complexity of required piping systems, thereby maintaining plant location versatility while still meeting external steam demands reliably.
4Device complexity
If steam is generated for internal use only, then capital expenditure is reduced, but steam production capacity is underutilized
Solution Approach 1:
The patent implements multi-functionality by designing the steam generation system to serve multiple purposes: internal process needs and external customer supply. The reforming process is optimized to generate steam that can be allocated to both functions, maximizing the utilization of steam production capacity without requiring excessive infrastructure for export.
Solution Approach 2:
The patent changes the steam-to-carbon ratio and other reforming parameters to optimize the total steam generation output. By carefully controlling these parameters, the system produces enough steam to meet both internal requirements and external export demands, thereby maximizing productivity and capacity utilization while keeping capital expenditure reasonable.
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 allows for the efficient generation of hydrogen and synthesis gas with minimal steam export, optimizing plant efficiency and reducing capital expenditures by integrating steam production and consumption within the facility.
Implementation Method 1
reacting the hydrocarbon with the steam in a reforming reaction under reaction conditions effective to form the reformed gas mixture
Implementation Method 2
combusting the combustible gases with the oxygen in the combustion section under conditions effective to combust the combustible gases to form a combustion product gas mixture and generate heat to supply energy for the reforming reaction
Implementation Method 3
generating an intermediate gas stream comprising steam from a liquid water-containing stream via indirect heat exchange between the liquid water-containing stream and at least one of a stream formed from the reformed gas mixture and a stream formed from the combustion product gas mixture
Data Source
AI summary
A method for generating hydrogen and/or syngas in a production facility where little or no export steam is produced. Most or all of the steam produced from the waste heat from the process is used in the steam-hydrocarbon reformer. Reformed gas is passed to a pressure swing adsorption system for H2 purification. In the method, CO2 is removed from the pressure swing adsorber residual gas prior to recycling the residual gas to the reformer for use as feed and as fuel. Plant efficiencies using the method and prior art-type methods are compared.