Ammonia Synthesis Loop Partial Load Control
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Solution Overview
Problem
Conventional ammonia synthesis loops are not suitable for running at partial loads, especially when coupled with renewable energy sources, as they are prone to equipment damage and thermal instability, and require large and expensive gas buffers to manage fluctuating hydrogen production.
Innovation Solution
A control method for the ammonia synthesis loop that adjusts synthesis pressure to a reduced level and uses a bypass system to maintain pressure within a target range, allowing the loop to operate efficiently at partial loads without the need for a large gas buffer, by separating a gas stream upstream of the converter and reintroducing it downstream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the ammonia synthesis loop operates at partial load below 60%-70% capacity, then the flexibility to follow renewable energy fluctuations is improved, but equipment damage risk increases due to high gas velocity and pressure shocks
Solution Approach 1:
The system dynamically adjusts operating parameters including synthesis pressure, recirculation flow rate, and heater power based on real-time load conditions. The controller modifies these parameters to maintain stable operation across varying load levels, preventing equipment damage while enabling flexibility to follow renewable energy fluctuations.
Solution Approach 2:
The invention changes key operating parameters such as synthesis pressure (reducing it at partial loads), recirculation flow rate, and heater power input to maintain optimal conditions for the ammonia synthesis reaction. These parameter adjustments allow the system to operate safely at partial loads without equipment damage.
2Adaptability or versatility
If the ammonia synthesis loop operates at partial load, then the adaptability to renewable energy sources is improved, but thermal self-sustained operation is lost due to excessive recycled ammonia compared to fresh makeup gas
Solution Approach 1:
The system dynamically adjusts heater power input and recirculation flow rate based on real-time load conditions. At partial loads, the controller increases heater power to compensate for reduced thermal self-sustained operation and adjusts recirculation to maintain appropriate temperature profiles in the converter, ensuring thermal stability across varying operating conditions.
Solution Approach 2:
The controller uses feedback from temperature sensors and flow meters to continuously monitor and adjust heater power input and recirculation flow rate. This feedback mechanism ensures that thermal self-sustained operation is maintained even at partial loads by compensating for the excessive recycled ammonia through controlled heating and recirculation adjustments.
3Stability of the object's composition
If a large gas buffer tank is installed to manage fluctuating hydrogen production from renewable sources, then the stability of ammonia production is improved, but the device complexity and cost increase
Solution Approach 1:
The invention replaces the mechanical buffer tank system with a control-based solution. Instead of using a large gas buffer tank to smooth out fluctuations from renewable energy sources, the system uses a controller that dynamically adjusts synthesis pressure, recirculation flow rate, and heater power to maintain stable ammonia production. This substitution eliminates the need for expensive buffer tank infrastructure.
Solution Approach 2:
The system achieves self-regulation by using its own operational parameters (pressure, flow rate, heater power) to compensate for fluctuations in hydrogen production from renewable sources. The controller adjusts these parameters in real-time to maintain stable ammonia output without requiring external buffer storage infrastructure.
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
Enables stable operation of the ammonia synthesis loop at varying loads, including down to 20% of nominal capacity, protecting equipment from overheating and pressure shocks, and maintaining self-sustained operation across a broad range of output, reducing the need for heat input and buffer storage.
Implementation Method 1
a catalytic converter, a condenser, a separator. The converter produces a hot ammonia-containing gaseous product
Implementation Method 2
The converter produces a hot ammonia-containing gaseous product which, after condensation, is separated into a liquid ammonia product
Data Source
AI summary
A process for synthesis of ammonia wherein an ammonia synthesis loop includes an ammonia converter where a makeup gas is reacted to form ammonia, and the loop is controlled at a partial load by reducing the synthesis pressure and maintaining the reduced pressure within a desired range by controlling a bypass line of make-up gas of the converter.