PSA Tail Gas Compression Using Waste-Heat Steam Power
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Solution Overview
Problem
Existing hydrogen production processes require significant energy to operate, particularly for compressing the PSA offgas stream, which increases the overall cost and energy consumption.
Innovation Solution
The method utilizes low-grade heat from the hydrogen production process to generate low-pressure steam, which is then used to power a steam turbine. The turbine generates power to reduce the energy required for the tail gas compressor, thereby decreasing the overall energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low-grade heat is used to generate low-pressure steam to power a steam turbine, then energy efficiency is improved, but device complexity increases
Solution Approach 1:
The patent converts low-grade waste heat, which would otherwise be discarded, into useful mechanical work through a steam turbine. The waste heat from the hydrogen production process is used to generate low-pressure steam, which then drives the turbine to produce power for the tail gas compressor, transforming a harmful waste product into a beneficial energy source.
Solution Approach 2:
The system uses its own waste heat to power its own compression requirements. The low-grade heat generated within the hydrogen production process is utilized to generate steam that drives the turbine, which in turn powers the tail gas compressor, creating a self-sufficient energy loop that reduces external energy demands.
2Ease of operation
If the tail gas compressor is powered by external energy sources, then the hydrogen production process can operate, but energy consumption increases
Solution Approach 1:
The patent converts low-grade waste heat, which would otherwise be discarded, into useful mechanical work through a steam turbine. The waste heat from the hydrogen production process is used to generate low-pressure steam, which then drives the turbine to produce power for the tail gas compressor, transforming a harmful waste product into a beneficial energy source.
Solution Approach 2:
Instead of discarding the low-grade heat from the hydrogen production process, the system recovers it by using it to generate low-pressure steam. This recovered energy is then utilized to power the steam turbine and subsequently the tail gas compressor, preventing energy waste and improving overall process efficiency.
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 reduces the energy required for the hydrogen production process by using waste heat to power the steam turbine, which in turn decreases the power needed for the tail gas compressor, leading to improved energy efficiency and cost savings.
Implementation Method 1
The low pressure steam stream is introduced to a steam turbine to generate power
Implementation Method 2
utilizes low-grade heat produced in the hydrogen production process to reduce the energy required by the compressor
Data Source
AI summary
Methods which utilize low-grade heat produced in the hydrogen production process to reduce the energy required by the compressor to compress the PSA tail gas stream. The low-grade heat is used to produce a low-pressure steam stream. The low pressure steam stream is introduced to a steam turbine to generate power. The power produced by the turbine reduces the amount of power required to operate the tail gas compressor, thus reducing the overall power requirement for the process.