Ammonia Cracker Heater Control for Load-Follow Hydrogen Output
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Solution Overview
Problem
In load follow operation processes, the temporary lowering of an internal reactor temperature due to the supply of room-temperature ammonia can lead to decreased ammonia decomposition ratios, catalyst deactivation, and increased residual ammonia, causing performance degradation in hydrogen production systems.
Innovation Solution
A hydrogen cracking apparatus and method that includes a reactor, a heater, a fuel cell, a battery, and a controller. The controller receives temperature and power consumption information to control the heater's operation, ensuring optimal thermal efficiency by comparing expected power consumption and temperature increase values, and by pre-heating ammonia before injection into the reactor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the supply of ammonia into the reactor is increased to increase hydrogen production, then hydrogen production increases, but the reactor temperature drops causing ammonia decomposition ratio to decrease
Solution Approach 1:
The patent applies preliminary action by pre-heating the ammonia before it enters the reactor using a heat exchanger. This pre-heating process prepares the ammonia at an optimal temperature prior to decomposition, preventing the reactor temperature from dropping when ammonia supply is increased, thus maintaining both high hydrogen production and stable reactor temperature
Solution Approach 2:
The patent changes the temperature parameter of the ammonia by introducing a heat exchanger that heats the ammonia to a predetermined temperature range (150-300°C) before it enters the reactor. This parameter change ensures that increased ammonia supply does not cause reactor temperature drop, resolving the contradiction between productivity and temperature stability
2Productivity
If the supply of ammonia into the reactor is increased to increase hydrogen production, then hydrogen production increases, but the ammonia decomposition ratio decreases causing catalyst deactivation
Solution Approach 1:
The patent applies preliminary action by pre-heating the ammonia before it enters the reactor using a heat exchanger. This pre-heating process prepares the ammonia at an optimal temperature prior to decomposition, preventing the reactor temperature from dropping when ammonia supply is increased, thus maintaining both high hydrogen production and stable reactor temperature
Solution Approach 2:
The patent implements feedback control by using a temperature sensor to monitor the reactor temperature and a controller to adjust the heater operation accordingly. When temperature drops are detected due to increased ammonia supply, the controller automatically activates the heater to maintain optimal temperature, preventing catalyst deactivation while allowing continued high productivity operation
3Temperature
If the heater is operated to maintain reactor temperature, then temperature stability improves, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by pre-heating the ammonia before it enters the reactor using a heat exchanger. This pre-heating process prepares the ammonia at an optimal temperature prior to decomposition, preventing the reactor temperature from dropping when ammonia supply is increased, thus maintaining both high hydrogen production and stable reactor temperature
Solution Approach 2:
The patent applies self-service by using the heat generated from the exothermic ammonia decomposition reaction itself to pre-heat the incoming ammonia through a heat exchanger. The system uses its own thermal energy to maintain temperature stability, reducing the need for external heating and minimizing additional power consumption
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 solution effectively maintains optimal reactor temperatures, preventing temperature drops and thereby stabilizing ammonia decomposition ratios, reducing catalyst deactivation, and minimizing residual ammonia, thus enhancing the overall thermal efficiency and performance of the hydrogen production system.
Implementation Method 1
a heater for heating the reactor
Implementation Method 2
a fuel cell reacting hydrogen to generate power and supply at least part of the generated power to the battery
Implementation Method 3
a reactor that decomposes ammonia to generate hydrogen
Data Source
AI summary
A hydrogen cracking apparatus includes a driver operated by a power supplied from a battery, a reactor that decomposes ammonia to generate hydrogen, a heater for heating the reactor, a fuel cell reacting hydrogen to generate power and supply at least part of the generated power to the battery, a sensor measuring internal temperature information of the reactor, and a controller receiving the internal temperature information transmitted by the sensor. The controller is configured to receive power consumption information of the battery, and to control an operation of the heater by comparing an expected power consumption expected when driving the heater and an expected temperature increase value expected when driving the reactor.