H2-O2 Reactor Steam Cycle for Low-CO2 Power Generation
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Solution Overview
Problem
Conventional power plants using hydrogen as fuel face challenges in achieving high efficiency, low emissions, and flexible operation while maintaining low capital costs.
Innovation Solution
An apparatus comprising a gas turbine, a waste heat steam generator with one pressure stage, and an H2-O2 reactor that reacts hydrogen and oxygen to produce steam, which is then used to power a steam turbine, with controlled feed water injection for reaction management and steam temperature adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If hydrogen is used as fuel in conventional power plants, then CO2 emissions are reduced, but efficiency and economic viability deteriorate
Solution Approach 1:
The power plant is divided into two independent fuel paths: a gas turbine path for natural gas combustion and a steam turbine path for hydrogen combustion. This segmentation allows each path to be optimized for its specific fuel type, with the steam turbine path achieving higher efficiency through dedicated hydrogen combustion and waste heat utilization, while the gas turbine path provides baseline power generation.
Solution Approach 2:
The waste heat steam generator serves multiple functions: it generates steam from waste heat of the gas turbine, provides feed water to the H2-O2 reactor, and enables the steam turbine to operate with hydrogen fuel. This multi-functionality increases overall system efficiency and economic viability while maintaining CO2 reduction benefits.
2Productivity
If fuel cells are used to generate electrical energy from hydrogen, then efficiency is improved, but specific capital costs increase
Solution Approach 1:
The patent replaces the electrochemical fuel cell system with a thermal-mechanical system consisting of an H2-O2 reactor that produces steam, which then drives a steam turbine. This substitution maintains high efficiency for hydrogen utilization while using conventional, lower-cost mechanical components instead of expensive fuel cell stacks.
Solution Approach 2:
The system changes the operational parameters by using high-temperature steam (up to 1300°C) from the H2-O2 reactor to drive the steam turbine, rather than using electrochemical conversion at lower temperatures. This parameter change enables high efficiency hydrogen utilization through well-established thermal-mechanical technology with lower capital costs.
3Object-generated harmful factors
If renewable energies are used for power generation, then CO2 emissions are eliminated, but operational flexibility deteriorates
Solution Approach 1:
The power plant is designed with dynamic operational capabilities, allowing the gas turbine and steam turbine to operate independently or together, and enabling flexible fuel mixing ratios. The system can adapt to varying renewable energy availability by adjusting the operation of each turbine unit, providing operational flexibility while maintaining CO2-free operation through hydrogen utilization.
4Object-generated harmful factors
If hydrogen is produced by water electrolysis with renewable energies, then CO2 neutrality is achieved, but production complexity and cost increase
Solution Approach 1:
The H2-O2 reactor in the power plant serves dual purposes: it generates electrical energy through steam turbine operation and simultaneously produces water as a byproduct. This self-service function offsets the water consumption of the electrolysis process, reducing the overall complexity and cost of achieving CO2-neutral hydrogen production and utilization.
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 system achieves high efficiency and flexibility with reduced capital costs by optimizing steam generation and utilization, allowing for increased power output and reduced emissions, particularly when hydrogen is partially replaced by natural gas.
Implementation Method 1
in the H2—O2 reactor, a reaction of oxygen and hydrogen to give steam is achievable
Implementation Method 2
a waste heat steam generator which is connected to the exhaust gas duct of the internal combustion engine
Implementation Method 3
the resulting greatly superheated steam can be fed to a steam turbine, and a generator connected to the steam turbine can provide an electrical power
Data Source
AI summary
A device and method for generating electrical energy from hydrogen and oxygen, includes a combustion engine, a heat recovery steam generator connected into the exhaust gas duct of the combustion engine, wherein the heat recovery steam generator has only one pressure stage. An H2—O2 reactor is provided to which steam from the heat recovery steam generator, water, oxygen and hydrogen are fed, such that, in the H2—O2 reactor, a reaction of oxygen and hydrogen forms steam, the water that is introduced is evaporated, additional steam is generated, the resultant superheated steam is fed to a steam turbine, and a generator connected to the steam turbine provides an electric power. High-pressure feed water is injected from the heat recovery steam generator into the H2—O2 reactor via a line to control the reaction in the H2—O2 reactor in a targeted manner and set the steam exit temperature from the H2—O2 reactor.