Integrated Steam Cracker and Hydrogen Separation
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Solution Overview
Problem
Current steam cracker and blue hydrogen production processes require two separate separation units, which are expensive and inefficient, necessitating a more cost-effective integrated process.
Innovation Solution
Integrate the methane/hydrogen separation into the separation section of the blue hydrogen plant, reducing equipment count and capital costs, and achieving synergies that lower overall power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two separate separation units are used (one for steam cracker off gas and one for synthesis gas), then hydrogen and methane can be separated effectively, but capital cost and equipment complexity increase significantly
Solution Approach 1:
The patent combines two separate separation units into a single integrated separation unit that processes both steam cracker off gas and synthesis gas streams. This merging reduces the number of compressors and separation equipment from four total units to two units, thereby reducing capital cost and equipment complexity while maintaining effective hydrogen and methane separation through unified processing
2Reliability
If two separate separation units are used, then complete hydrogen recovery is achieved, but power consumption and operating costs increase
Solution Approach 1:
The integrated separation unit merges the processing of steam cracker off gas and synthesis gas streams, reducing the total number of compressors from four to two. This consolidation maintains complete hydrogen recovery while significantly reducing power consumption and operating costs associated with running multiple separate compression and separation systems
3Adaptability or versatility
If stand-alone separation blocks are used for each gas stream, then process flexibility is maintained, but capital expenditures increase
Solution Approach 1:
The patent merges the separation of steam cracker off gas and synthesis gas into a single integrated separation unit, reducing capital expenditures by eliminating redundant equipment. The unified design maintains process flexibility by handling multiple gas streams through one adaptable separation system, thereby achieving cost-effectiveness without sacrificing operational 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
This integration reduces the need for stand-alone separation blocks, decreases capital expenditures, and enhances energy efficiency by leveraging synergies in the separation process.
Implementation Method 1
separating the synthesis gas stream and the steam cracker off gas stream in the separation zone of the hydrogen production zone producing a hydrogen product stream comprising hydrogen from the synthesis gas stream and hydrogen from the steam cracker off gas stream
Implementation Method 2
separating the synthesis gas stream and the steam cracker off gas stream in the separation zone of the hydrogen production zone producing a hydrogen product stream
Implementation Method 3
producing a synthesis gas stream comprising hydrogen, methane, carbon monoxide, and carbon dioxide in a hydrogen production zone
Data Source
AI summary
Integrated steam cracking processes and hydrogen production processes are described. The steam cracker off gas stream and the synthesis gas stream are sent to the separation zone of the hydrogen production process and separated into a hydrogen stream, a carbon dioxide stream, and a second off gas stream in a separation zone. The second off gas stream comprises methane from the synthesis gas and methane from the steam cracker off gas stream, as well as carbon monoxide from the synthesis gas stream. All or a portion of the hydrogen product stream is sent to the steam cracking zone as fuel for the steam cracker reactor. The remainder (if any) of the hydrogen product stream can be recovered. The second off gas stream is sent to the hydrogen production zone as feed for the synthesis gas reactor. The carbon dioxide can be recovered.