Hydrogen-CO2 Heat Loop for Carbon Capture in Cement Plants
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Solution Overview
Problem
Industrial processes, particularly cement production, heavily rely on fossil fuels, leading to significant greenhouse gas emissions and environmental pollution, with existing attempts to integrate renewable fuels like hydrogen facing challenges in conventional plant design and efficient CO2 management.
Innovation Solution
A system integrating renewable hydrogen fuel generation and utilization within industrial plants, utilizing CO2 as a heat carrier, with a gas separation and filtration unit to capture and recycle byproducts, and an electrolysis unit to regenerate gases, enabling efficient CO2 capture and sequestration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If fossil fuels are used for heat and power in industrial plants, then energy requirements are met, but greenhouse gas emissions and air pollution increase significantly
Solution Approach 1:
The patent changes the chemical composition parameter of the fuel from fossil-based to renewable biomass-based, transforming the combustion process to produce CO2 that can be captured and reused. This parameter change enables the system to meet energy requirements while eliminating net greenhouse gas emissions through the closed-loop carbon cycle.
Solution Approach 2:
The patent introduces CO2 as an intermediary substance that serves multiple functions: it is a combustion product, a heat carrier in the gas circulation system, and a feedstock for algae cultivation. This intermediary enables the transformation of waste emissions into useful resources, resolving the contradiction between energy production and emission reduction.
2Object-generated harmful factors
If renewable fuel gas is integrated into conventional industrial plant processes, then greenhouse gas emissions are reduced, but major changes in conventional plant design are required
Solution Approach 1:
The patent designs a multi-functional system where CO2 serves multiple purposes: combustion product, heat carrier, and algae feedstock. The gas circulation system performs both heat transfer and CO2 distribution functions. This multi-functionality reduces the need for separate dedicated systems, thereby minimizing design complexity while achieving emission reduction goals.
Solution Approach 2:
The patent merges the CO2 capture system with the heat carrier gas circulation system and the algae cultivation system into an integrated closed-loop process. By combining these functions into a unified system, the patent reduces overall plant complexity compared to having separate independent systems for each function.
3Object-generated harmful factors
If CO2 is captured and sequestered from industrial processes, then greenhouse gas emissions are eliminated, but effective and efficient CO2 management systems are complex to implement
Solution Approach 1:
The patent implements a self-service CO2 management system where the industrial plant's own CO2 emissions are captured and reused within the same facility for algae cultivation. This internal recycling eliminates the need for external CO2 transport and storage infrastructure, significantly simplifying the CO2 management system while achieving emission elimination.
Solution Approach 2:
The patent converts the harmful CO2 emissions into a beneficial resource for algae cultivation, which in turn produces biomass for fuel generation. This transformation turns the CO2 management challenge into an opportunity for renewable fuel production, simplifying the overall system by creating a value-added product from the emissions.
4Object-generated harmful factors
If hydrogen is used as renewable fuel in industrial plants, then CO2 emissions are reduced, but efficient generation and integration of hydrogen presents unaddressed technical challenges
Solution Approach 1:
The patent employs dynamic gas composition control in the combustion system, adjusting the ratio of renewable fuel gas to recirculated CO2-based gas to optimize combustion efficiency and hydrogen utilization. This dynamic adjustment capability enables efficient hydrogen integration without requiring complete redesign of the combustion system, thereby improving ease of manufacture.
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
Significantly reduces CO2 emissions by using hydrogen combustion as a green fuel, facilitating complete capture of CO2 from flue gas, and promoting sustainable cement manufacturing with minimal modifications to existing plant setups.
Implementation Method 1
The first gas is a renewable fuel gas, functioning as a heat supplier
Implementation Method 2
A third gas released as a primary byproduct of the process acts as a heat carrier to circulate heat during the process
Implementation Method 3
The internal gas regeneration unit processes at least one of the secondary byproducts to regenerate at least one of the first gas and the second gas
Data Source
AI summary
Providing an implementable renewable fuel gas plant processes with management of greenhouse gases with minimal changes to existing plant set ups is a technical challenge to be addressed. Embodiments herein provide a system for renewable fuel gas generation and utilization in industrial plants with carbon dioxide as heat carrier. The system design integrates renewable fuel gas (H2) which is generated within the system and utilized to meet the thermal energy requirements of the production process. CO2 produced as byproduct of calcination in a process equipment, such as during calcination in cement plant is used as a heat-transferring medium to heat the H2. Further, the system provides recycling of the generated byproducts by separating the exhaust gases, comprised of CO2 and H2O. The H2O is recycled to generate H2 via electrolysis. The separated CO2 again serves as a heat-transferring medium, while the excess CO2 is sequestrated.