Auxiliary Combustor for Nuclear Reactor Load Response
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Solution Overview
Problem
Externally-heated gas turbine engines face challenges in efficiently managing temperature and load demand fluctuations, particularly when using a nuclear reactor as a heat source, which can be slow to respond to rapid changes in power demand, leading to potential energy imbalances and inefficient operation.
Innovation Solution
An auxiliary combustion system with a controller and bypass valve is integrated into the power-generation system, allowing for the external heating of compressed air by an auxiliary combustor and the selective exhaustion of air via a bypass valve, based on temperature and load demand, to rapidly adjust heat input and output to match power requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a nuclear reactor is used as the primary heat source for the externally-heated gas turbine engine, then the engine can operate continuously with stable heat input, but the system cannot respond rapidly to changes in power demand due to the slow thermal response of the reactor
Solution Approach 1:
The heating system is segmented into two independent parts: a nuclear reactor heat exchanger for stable baseline heating and an auxiliary combustor for rapid response heating. This allows each component to fulfill its specialized function without compromising the other.
Solution Approach 2:
The auxiliary combustor acts as an intermediary system that bridges the gap between the slow-responding nuclear reactor and the rapidly varying power demand. It supplements the reactor's heat output when needed and can be quickly adjusted or shut down.
2Power
If the auxiliary combustor is used to supplement heat during peak demand, then the system can meet high power requirements, but fuel consumption increases
Solution Approach 1:
The auxiliary combustor provides partial heating supplementation rather than continuous operation. It activates only when the reactor's heat output is insufficient to meet demand, avoiding unnecessary fuel consumption during periods when reactor heat is adequate.
Solution Approach 2:
The controller continuously monitors the temperature of compressed air from the reactor heat exchanger and the power demand, automatically activating or deactivating the auxiliary combustor based on whether the reactor's heat output is sufficient to meet current demand.
3Power
If the auxiliary combustor is activated to increase compressed air temperature, then the turbine can produce more power, but the complexity of the control system increases
Solution Approach 1:
The controller uses feedback from temperature sensors and power demand signals to automatically control the auxiliary combustor's operation, adjusting fuel flow and air intake to maintain optimal compressed air temperature for turbine power production.
Solution Approach 2:
The control system automatically manages the auxiliary combustor's operation based on real-time system conditions, eliminating the need for manual intervention and simplifying operator tasks while maintaining optimal performance.
4Power
If the bypass valve is used to exhaust compressed air during low demand, then the system avoids excessive power generation, but energy is wasted by exhausting heated air
Solution Approach 1:
The bypass valve extracts excess compressed air from the system and directs it to exhaust when power demand is low. This prevents over-pressurization and allows the system to safely dissipate excess energy while maintaining operational flexibility.
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 configuration enables the power-generation system to quickly respond to changes in load demand, ensuring efficient energy production by supplementing the nuclear reactor's heat during startup and peak demand periods, while avoiding excessive power generation during low demand, thus maintaining stable operation and reducing the risk of energy imbalances.
Implementation Method 1
The reactor heat exchanger may be configured to transfer heat continuously from the nuclear reactor to the compressed air to heat the compressed air during use of the power-generation system
Implementation Method 2
The auxiliary combustor may ignite the fuel and the compressed air to increase a temperature of the compressed air
Data Source
AI summary
A power-generation system for a nuclear reactor includes a power unit, a reactor heat exchanger, and an auxiliary combustion system. The power unit produces compressed air that is heated by the reactor heat exchanger. The auxiliary combustion system includes an auxiliary combustor located external to the power unit and fluidly connected with the compressed air to increase the temperature of the compressed air.