Geothermal Heat Exchanger for Algae Hydrothermal Liquefaction
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Solution Overview
Problem
Current biofuel production from algae faces challenges in scalability and cost-efficiency due to high energy requirements for lipid extraction, maintaining suitable growing conditions, and large volumes of water and CO2 needed for photosynthesis, which have hindered the development of practical and cost-effective conversion processes.
Innovation Solution
The use of geothermal energy sources in oceanic or subterranean locations to facilitate hydrothermal liquefaction (HTL) of wet algae, enabling efficient conversion into bio oil, biocrude, and biofuel, with a system that includes a heat exchanger to transfer thermal energy and a controller to optimize conditions such as temperature, pressure, and catalyst concentration for enhanced yield and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high temperatures and pressures are used for hydrothermal liquefaction, then biofuel conversion efficiency is improved, but operational costs increase
Solution Approach 1:
The system utilizes geothermal energy from the Earth's natural heat sources to provide the high temperatures and pressures required for hydrothermal liquefaction. The geothermal fluid circulates through heat exchangers, transferring thermal energy to the algae slurry without requiring external fuel combustion or electrical heating, thereby making the process self-sufficient and reducing operational costs.
Solution Approach 2:
The patent replaces conventional mechanical heating systems (fossil fuel boilers or electrical heaters) with a geothermal thermal field. The geothermal energy naturally occurring in the Earth is harnessed through heat exchangers to achieve the required reaction conditions, substituting mechanical energy conversion with direct thermal energy transfer from the Earth's interior.
2Use of energy by moving object
If geothermal energy is used for heating, then energy costs are reduced, but system complexity increases
Solution Approach 1:
Heat exchangers serve as intermediary devices between the geothermal fluid and the algae slurry. These heat exchangers enable thermal energy transfer without direct contact between the geothermal fluid and the biological material, simplifying the system architecture while maintaining effective heat transfer and avoiding contamination issues.
Solution Approach 2:
The geothermal system is designed to perform multiple functions: heating the algae slurry for hydrothermal liquefaction, sterilizing equipment through hot water circulation, and potentially generating electricity through turbines. This multi-functionality reduces the need for separate systems and justifies the initial complexity through operational versatility.
3Productivity
If high temperature processing is used, then biofuel yield is improved, but biomass degradation increases
Solution Approach 1:
The system precisely controls temperature, pressure, and residence time parameters during hydrothermal liquefaction. By optimizing these parameters within specific ranges (e.g., 250-350°C, 75-225 atm, 10-120 minutes), the process achieves high biofuel conversion while minimizing unwanted side reactions and biomass degradation, balancing yield with material integrity.
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 a scalable and cost-efficient biofuel production by leveraging geothermal energy, reducing operational costs and environmental impact while optimizing biofuel quality and yield, and potentially producing valuable by-products like nitrogen, phosphorus, and rare earth metals.
Implementation Method 1
The HTL converter includes a heat exchanger arranged to transfer thermal energy from a geothermal heat source to the biomass to convert the biomass into the processed biomass
Data Source
AI summary
A system for converting a biomass into a biofuel including a biomass processing station arranged to receive the biomass from a biomass harvester, output the biomass to a hydrothermal liquefaction (HTL) converter, and receive a processed biomass from the HTL converter. The system includes a conduit arranged to transport the biomass from the biomass processing station to the HTL converter and transport the processed biomass from the HTL converter to the biomass processing station. The HTL converter includes a heat exchanger arranged to transfer thermal energy from a geothermal heat source to the biomass to convert the biomass into the processed biomass. The system also includes a controller arranged to monitor conditions of the biomass at locations along the conduit and adjust operations of components along the conduit to, thereby, adjust the conditions of the biomass at one or more locations along the conduit.