Process Reactor Heat Buffer for Flexible Ammonia Production
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Solution Overview
Problem
Conventional ammonia production processes using renewable energy sources face challenges with load flexibility due to fluctuating energy availability, leading to inefficient operation, high energy costs, and frequent shutdowns, especially in Haber-Bosch cycles, where the limited adaptability of ammonia reactors results in significant heat loss and mechanical stress.
Innovation Solution
A start-up heater designed as a heat buffer with thermal storage medium, such as thermal oil or solid materials, is used to store heat during normal operation and supply activation energy during start-up or partial load, combined with electric heating to maintain efficient reactor temperature and adapt to varying energy inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional ammonia reactor is used with fixed operating parameters, then the reactor operates efficiently at optimal point, but it cannot adapt to fluctuating renewable energy availability causing frequent shutdowns and high energy costs
Solution Approach 1:
The patent applies preliminary action by preheating the reactant mixture using the start-up heater before the exothermic reaction begins. The reactor is equipped with a start-up heater that can rapidly heat the feed stream to the required temperature, enabling the reactor to start up and shut down more efficiently without excessive heat loss to the environment.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the operating parameters of the reactor based on renewable energy availability. The control system modifies flow rates, temperature setpoints, and heater power levels in response to fluctuating energy input, allowing the reactor to operate efficiently across a range of loading conditions rather than being locked into a single optimal point.
2Use of energy by moving object
If the reactor operates at reduced load to match fluctuating energy availability, then energy costs are reduced, but reactor performance deteriorates and efficiency drops
Solution Approach 1:
The patent applies dynamics by making the reactor operating parameters adjustable and responsive to real-time conditions. The system can dynamically shift between different operating modes (startup, steady-state, shutdown) and adjust flow rates, temperatures, and heater power levels to match fluctuating renewable energy availability while maintaining acceptable efficiency across the operating range.
Solution Approach 2:
The patent implements feedback control by using sensors to monitor reactor temperature, pressure, and flow rates, then feeding this information back to the control system. The control system adjusts the start-up heater power and other operating parameters in real-time to maintain optimal reaction conditions even at reduced loads, preventing efficiency deterioration.
3Adaptability or versatility
If start-up heater is used frequently to adapt to energy fluctuations, then load flexibility is improved, but energy costs and mechanical stress increase
Solution Approach 1:
The start-up heater performs preliminary heating of the reactant mixture before it enters the reactor. By preheating the feed stream, the system can reduce the thermal shock and mechanical stress that would otherwise occur during frequent startup and shutdown cycles, extending the life of reactor components while maintaining load flexibility.
Solution Approach 2:
The patent applies beforehand cushioning by using the start-up heater to gradually bring the reactant mixture to operating temperature before the main reaction begins. This gradual heating process cushions against thermal shocks and mechanical stress that would occur with abrupt temperature changes during frequent startup and shutdown cycles.
4Adaptability or versatility
If extensive energy storage means are implemented to follow renewable energy fluctuations, then process flexibility is improved, but economic performance deteriorates
Solution Approach 1:
The patent applies self-service by designing the reactor system to be self-regulating through feedback control. The reactor uses its own heat from the exothermic reaction and adjustable heating from the start-up heater to maintain operating conditions without requiring external energy storage systems. The system serves itself by dynamically adjusting operating parameters to match renewable energy availability.
Solution Approach 2:
The patent implements universality by designing the reactor system to handle multiple operating conditions and energy input levels. The start-up heater can operate at varying power levels, the flow rates can be adjusted, and the system can function efficiently across a wide range of loading conditions, eliminating the need for separate storage systems for different operational scenarios.
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 solution enhances the flexibility and efficiency of ammonia production by allowing rapid adjustments to energy fluctuations, reducing shutdowns and energy costs, while maintaining reactor performance even with reduced load, thus optimizing the use of renewable energy.
Implementation Method 1
a start-up operation in which at least part of the activation energy is supplied to the reactant mixture in the form of heat using a start-up heater
Implementation Method 2
convert it into a raw gas in an exothermic reaction in a reactor
Implementation Method 3
A start-up heater designed as a heat buffer with thermal storage medium, such as thermal oil or solid materials, is used to store heat during normal operation
Data Source
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AI summary
The invention relates to a method and a plant for producing a process product in which a reactant mixture (1) is fed to a reactor (20) and converted in the reactor (20) in an exothermic reaction with an activation energy to form a raw gas (3), wherein the method comprises a start-up operation (210) in which at least part of the activation energy is provided using a start-up heater (10), and a normal production operation (220) carried out after the start-up operation (210), wherein in the production operation (220) at least part of the activation energy is provided using thermal energy generated during the exothermic reaction. What is characteristic here is that the start-up heater (10) provided for the start-up operation is designed as a heat buffer with a heat storage medium.