Solid Oxide Electrolysis Heat Recovery via Multi-Stage Water Preheating
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Solution Overview
Problem
The high energy consumption in heating water to 800°C for solid oxide electrolysis cells in hydrogen production, which is inefficient when using traditional electric or fuel heating methods.
Innovation Solution
A heat recovery system that utilizes waste heat from various components, including solar panels, metal hydrogen storage tanks, and reaction heat, for multi-stage heating of water to the required temperature for solid oxide electrolysis cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional electric heating or fuel heating is used to heat water to 800°C for solid oxide electrolysis cell, then water can reach the required working temperature, but energy consumption of the whole system will be greatly increased
Solution Approach 1:
The patent combines multiple heat sources (solar cell panel waste heat, metal hydrogen storage tank reaction heat, evaporator heat, heat exchanger heat) into a unified heating system for water. This merging of heat recovery pathways allows efficient utilization of waste heat that would otherwise be lost, significantly reducing the energy consumption required to heat water to 800°C for the solid oxide electrolysis cell while maintaining the required temperature.
2Loss of energy
If solar cell panel is used for heating water, then waste heat can be recovered, but the panel temperature increases which affects power generation efficiency
Solution Approach 1:
The patent introduces an intermediary heat exchange system between the solar cell panel and the water heating system. The solar cell panel's waste heat is transferred through a heat exchanger to preheat water before it enters the multi-stage heating system. This intermediary approach allows waste heat recovery without directly increasing the panel temperature to the point of significantly reducing power generation efficiency, as the heat extraction is controlled and staged.
3Quantity of substance
If hydrogen is stored in metal hydrogen storage tank, then hydrogen can be stored effectively, but heat is released during storage process
Solution Approach 1:
The patent converts the harmful effect of heat release during hydrogen storage into a beneficial resource. The metal hydrogen storage tank's exothermic reaction heat, which would normally need to be dissipated, is instead captured and integrated into the water heating system. This heat is transferred through heat exchangers to contribute to heating water to the required 800°C, thereby converting a thermal management challenge into an energy recovery opportunity that reduces overall system energy 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
This system significantly reduces energy consumption by efficiently utilizing waste heat for heating water, enabling effective hydrogen production while also facilitating hydrogen storage and carbon dioxide emission reduction through methanol production.
Implementation Method 1
a solar cell panel...After water in the water storage tank sequentially passes through the solar cell panel
Implementation Method 2
the low-temperature metal hydrogen storage tank includes a heat exchange cavity I and a hydrogen confluence chamber I...the metal hydrogen storage microtubes are filled with hydrogen storage materials
Implementation Method 3
heat released in the hydrogen storage process of the hydrogen storage tank is used to heat water
Implementation Method 4
the evaporator, a high-temperature metal hydrogen storage tank...reaction heat of methane production is conveyed to the evaporator to heat the water
Implementation Method 5
the hydrogen generated after electrochemical reaction and unused water vapor flow out from a cathode product outlet of the solid oxide electrolysis cell, firstly exchange heat with to-be-reacted water vapor through the heat exchanger
Implementation Method 6
water vapor reaching the working temperature enters the solid oxide electrolysis cell. The hydrogen generated after electrochemical reaction
Implementation Method 7
hydrogen and carbon dioxide are reacted in the reactor to generate methane, and reaction heat of methane production is conveyed to the evaporator to heat the water
Data Source
AI summary
A heat recovery system for hydrogen production with a solid oxide electrolysis cell, including a water storage tank, a solar cell panel, a low-temperature metal hydrogen storage tank, an evaporator, a high-temperature metal hydrogen storage tank, a heat exchanger, a solid oxide electrolysis cell, a separator, and a reactor is provided. After water in the water storage tank sequentially passes through the solar cell panel, the low-temperature metal hydrogen storage tank, the evaporator, the high-temperature metal hydrogen storage tank, and the heat exchanger for multi-stage heat exchange, water vapor reaching the working temperature enters the solid oxide electrolysis cell. The hydrogen generated after electrochemical reaction and unused water vapor flow out from the solid oxide electrolysis cell, firstly exchange heat with to-be-reacted water vapor through the heat exchanger and then enter the separator.