Ammonia Synthesis Recirculation for Variable Flow and Compressor Stability
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Solution Overview
Problem
Existing ammonia synthesis systems face challenges in coping with flow rate changes due to renewable energy's temporal variability, leading to non-uniform flow rate distribution, temperature deviations in catalyst beds, surge phenomena in compressors, and increased energy and costs for ammonia separation.
Innovation Solution
An ammonia synthesis system with a compressor, feed and sweep gas recirculation lines, multiple catalyst beds, and separation devices, including backflow prevention and microwave heating, to maintain uniform flow distribution, reduce temperature deviations, and stabilize compressor operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the flow rate of raw material is decreased to adapt to renewable energy variability, then energy consumption is reduced, but flow rate distribution becomes non-uniform and temperature deviations occur in catalyst beds
Solution Approach 1:
The patent implements a dynamic flow rate adjustment mechanism that modifies the flow distribution to catalyst beds based on real-time operating conditions. When total flow rate decreases, the system dynamically redistributes the flow to maintain uniformity across all catalyst beds, preventing temperature deviations and maintaining synthesis efficiency while adapting to reduced energy input from renewable sources
Solution Approach 2:
The system changes operational parameters including flow rate distribution ratios, temperatures, and pressures across different catalyst beds in response to varying total flow rates. By adjusting these parameters dynamically, the system maintains optimal synthesis conditions and uniform flow distribution even when operating at reduced capacity, thereby reducing energy consumption without sacrificing stability
2Loss of energy
If the flow rate of raw material is decreased, then energy consumption is reduced, but compressor surge phenomena occur
Solution Approach 1:
The patent incorporates a feedback control system that continuously monitors compressor operating conditions and adjusts the suction flow rate accordingly. When the total flow rate decreases to levels that could cause surge, the feedback mechanism increases recirculation flow or adjusts inlet conditions to maintain the compressor operating point above the surge line, ensuring reliable operation while still allowing energy reduction through optimized raw material flow
Solution Approach 2:
The system takes preliminary action by predicting potential surge conditions based on the total flow rate and proactively adjusting operating parameters before surge occurs. The control system maintains a safety margin by pre-adjusting recirculation rates and inlet pressures to prevent compressor surge, allowing the system to operate at lower energy consumption levels without compromising reliability
3Productivity
If ammonia separation capacity is increased to handle variable production volumes, then ammonia recovery is improved, but system complexity and costs increase
Solution Approach 1:
The patent implements a dynamic ammonia separation system that adjusts its operating parameters and capacity utilization based on the actual ammonia production volume. The separation devices operate at variable loads, with control systems adjusting temperatures, pressures, and flow rates to maintain optimal separation efficiency regardless of production volume, thereby handling variable renewable energy input without requiring oversized fixed-capacity separation equipment
Solution Approach 2:
The separation system is designed with multi-functionality to handle a wide range of ammonia production volumes using the same equipment. By implementing flexible operating modes and adjustable parameters, the system can adapt its capacity to match variable renewable energy input, eliminating the need for complex oversized equipment or multiple parallel separation units
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 flexibly adapts to flow rate changes, prevents surge phenomena, reduces energy consumption, and lowers separation costs by maintaining uniform flow distribution and temperature uniformity, enhancing ammonia synthesis yield and catalyst efficiency.
Implementation Method 1
a microwave heating device for emitting microwaves to each of the two or more catalyst beds
Implementation Method 2
a compressor for compressing mixed gas
Data Source
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AI summary
An 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; a first ammonia separation device for separating syngas produced by the ammonia synthesis reactor into a sweep gas including nitrogen and hydrogen and into an ammonia rich gas; a second ammonia separation device for separating the ammonia rich gas into the ammonia and a regeneration stream including the nitrogen and the hydrogen; a feed recirculation line for recirculating the regeneration stream to the feed supply line; and a sweep gas recirculation line for recirculating the sweep gas to the ammonia synthesis reactor.