Ammonia Synthesis Buffer Tank for Renewable Flow Stability
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Solution Overview
Problem
Existing ammonia synthesis systems face challenges with flow rate variability due to renewable energy sources, leading to non-uniform flow rate distribution, temperature deviations within catalyst beds, and compressor surge phenomena, which affect yield and stability.
Innovation Solution
An ammonia synthesis system with a buffer tank, expander, and flow regulating devices in the feed recirculation line, along with multiple catalyst beds and microwave heating, to stabilize flow rates and temperatures, prevent compressor surges, and optimize energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If renewable energy sources (solar or wind) are used to power water electrolyzers for hydrogen production, then ammonia synthesis can be achieved using green energy, but temporal variability of renewable energy causes flow rate changes during production cycles
Solution Approach 1:
The buffer tank stores regeneration stream in advance to compensate for future flow rate deficiencies. When renewable energy output decreases, the stored regeneration stream is supplied to maintain stable flow rate through the ammonia synthesis reactor, ensuring continuous stable operation despite temporal variability of renewable energy sources
Solution Approach 2:
The buffer tank acts as an intermediary between the ammonia separation device and the ammonia synthesis reactor. It decouples the variable flow from renewable energy sources from the stable flow requirements of the catalyst bed, smoothing out fluctuations and maintaining uniform flow distribution across the catalyst
2Use of energy by moving object
If flow rate of raw material is decreased to match renewable energy availability, then energy consumption is optimized, but non-uniform flow rate distribution occurs at the front of catalyst bed
Solution Approach 1:
The buffer tank serves as a flow regulation intermediary that maintains uniform flow distribution across the catalyst bed front even when overall flow rate is reduced. By storing and gradually releasing regeneration stream, it ensures equitable flow distribution to all catalyst regions, preventing channeling and maintaining manufacturing precision in ammonia synthesis
Solution Approach 2:
The buffer tank pre-stores regeneration stream during periods of high renewable energy availability. This preliminary accumulation allows the system to maintain optimal flow distribution through the catalyst bed during subsequent low-flow periods, ensuring uniform utilization of catalyst material even when operating at reduced capacity
3Adaptability or versatility
If flow rate changes occur during operation, then system adapts to renewable energy variability, but compressor surge phenomenon occurs
Solution Approach 1:
The buffer tank pre-stores regeneration stream to compensate for upcoming flow rate reductions. When renewable energy output decreases and raw material flow rate drops, the stored regeneration stream is supplied to the compressor inlet, maintaining sufficient total flow rate to prevent surge phenomenon and ensuring continuous reliable compressor operation
Solution Approach 2:
The buffer tank acts as a flow stabilization intermediary between the variable renewable energy input and the compressor. It smooths out flow rate fluctuations by releasing stored regeneration stream during low-flow periods, preventing the minimum flow rate threshold from being breached and avoiding compressor surge instability
4Productivity
If ammonia synthesis system operates with variable flow rate, then renewable energy utilization is maximized, but temperature deviation between central and outer parts of catalyst bed increases
Solution Approach 1:
The buffer tank pre-stores regeneration stream during high-flow periods when temperature distribution is uniform. When flow rate decreases, the stored stream is released to maintain adequate flow through the catalyst bed, preventing temperature deviation between central and outer parts and ensuring uniform temperature distribution for optimal ammonia synthesis yield
Solution Approach 2:
The buffer tank mediates between variable flow rate operation and temperature uniformity requirements in the catalyst bed. By regulating the flow of regeneration stream to the reactor inlet, it ensures sufficient and uniform flow distribution across the catalyst bed front, maintaining thermal homogeneity and preventing hot spots or cold zones that would reduce ammonia synthesis 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
The system maintains uniform flow distribution, reduces temperature deviations, prevents compressor surges, and enhances ammonia yield by adapting to flow rate changes, thus stabilizing operations and increasing catalyst efficiency.
Implementation Method 1
a buffer tank installed in the feed recirculation line
Implementation Method 2
a microwave heating device for emitting microwaves to each of the two or more catalyst beds
Implementation Method 3
an ammonia synthesis reactor for synthesizing ammonia by feeding the mixed gas compressed by the compressor into the reactor
Data Source
AI summary
A ammonia synthesis system, an operation method thereof, and an ammonia synthesis method are provided. The system includes a compressor for compressing mixed gas; a feed supply line for supplying the mixed gas to the compressor; an ammonia synthesis reactor for synthesizing ammonia by feeding the mixed gas compressed by the compressor into the reactor; an ammonia separation device for separating syngas produced by the ammonia synthesis reactor into ammonia and a regeneration stream; a feed recirculation line for recirculating the regeneration stream to the feed supply line; and a buffer tank installed in the feed recirculation line.