Dual-Mode Reciprocating Engine for Chemical Energy Storage
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Solution Overview
Problem
The existing energy storage solutions, such as electrochemical storage and pumped storage power plants, are costly and face public resistance, while traditional chemical storage methods like Sabatier and Haber-Bosch processes require expensive catalysts and complex purification processes, making them inefficient for short-term energy balancing in the electrical grid.
Innovation Solution
A dual-mode apparatus that operates as an internal combustion engine during energy demand and as a pulsed compression reactor to convert excess electrical energy into chemical compounds like methane, methanol, or ammonia, allowing for temporary storage and later use as fuel, utilizing a reciprocating engine design with adjustable operating parameters for efficient energy conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional catalytic reactors (flow or fixed bed) are used for chemical energy storage, then chemical compounds can be produced, but the system requires complex purification processes and expensive catalysts
Solution Approach 1:
The invention extracts and removes the catalyst from the chemical reaction system, replacing it with a compression-based activation method. This eliminates the need for catalyst purification and removes the harmful effect of catalyst contamination from reactant purity requirements.
Solution Approach 2:
The invention introduces compression as an intermediary mechanism to activate chemical reactions without catalysts. The compression device acts as a mediator that provides the necessary activation energy through mechanical work, replacing the catalytic pathway entirely.
2Productivity
If traditional catalytic reactors are used, then chemical reactions can proceed, but the system has long start-up times and poor controllability
Solution Approach 1:
The invention employs periodic compression cycles to drive chemical reactions, allowing rapid initiation and termination of reaction processes. Each compression stroke represents a discrete reaction event that can be precisely controlled in time, enabling quick start-up and shutdown responses.
Solution Approach 2:
The system uses dynamic compression ratios and frequencies to control reaction rates, allowing rapid adjustment of productivity levels. The mechanical compression parameters can be changed instantaneously, providing superior controllability compared to thermal catalytic systems.
3Loss of energy
If excess energy is not stored chemically, then grid overload is prevented, but the energy is simply dissipated
Solution Approach 1:
The system uses the excess electrical energy directly to drive the compression process, which in turn drives the chemical reactions. The energy that would otherwise be wasted is converted into mechanical work for compression, and the reaction heat can be recovered, creating a self-sufficient energy cycle.
Solution Approach 2:
The invention changes the state parameters of reactants through compression (pressure, temperature, density) to enable chemical reactions without catalysts. This parameter transformation converts excess electrical energy into chemical bond energy, storing value that can be retrieved later.
4Adaptability or versatility
If specialized catalysts are used for specific reactions, then reaction selectivity is achieved, but the reactor can only be used for one specific reaction
Solution Approach 1:
The compression-based reaction system is universally applicable to various chemical reactions without requiring catalyst changes. By adjusting compression parameters (ratio, frequency, timing), the same device can selectively promote different reaction pathways, achieving both versatility and selectivity through parameter control rather than material specialization.
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 approach enables efficient short-term energy balancing by converting surplus electrical energy into high-calorific chemical compounds, reducing storage costs and improving grid stability with quick start-up and shutdown capabilities, and can utilize existing engine technology for energy production and storage.
Implementation Method 1
The reactants are compressed in a reciprocating engine, and the compression is sufficient to initiate a chemical reaction
Implementation Method 2
In a first mode, the apparatus operates as an internal combustion engine delivering energy
Data Source
AI summary
A method and apparatus according to the invention is described, which in a first mode operates as an internal combustion engine delivering energy and in a second mode operates as a pulsed compression reactor converting electrical energy in the form of chemical compounds. In the second mode, at least one of the generated compounds is collected and temporarily stored.