Cement CO2 Capture Reactor for Carbonate Storage and Hydrogen Production
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional carbon dioxide capture technologies in cement manufacturing facilities face high energy consumption and economic inefficiencies, and there is a lack of effective methods for utilizing captured carbon dioxide, leading to increased operational costs and limited feasibility.
Innovation Solution
A system utilizing a preheater with multiple cyclones, a calciner, a kiln, a reactor, and a hydrogen generator, employing a basic alkali mixed solution to capture and convert carbon dioxide into sodium carbonate or sodium bicarbonate, which is then stored underground for resource utilization and hydrogen production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If alkanolamine aqueous solution is used for CO2 absorption, then CO2 capture capability is improved, but energy consumption increases due to high decomposition heat in recycling process
Solution Approach 1:
The patent changes the chemical parameters of the absorption medium from alkanolamine to basic alkali mixed solution (containing NaOH, KOH, Ca(OH)2, or Ba(OH)2), which fundamentally alters the reaction thermodynamics. This parameter change reduces the decomposition heat and enables lower energy consumption in the recycling process while maintaining effective CO2 absorption capacity
Solution Approach 2:
The basic alkali mixed solution is designed to be inexpensive and can be continuously replenished at lower cost compared to alkanolamine systems. The solution undergoes chemical transformation during absorption and can be regenerated or replaced more economically, reducing overall operational costs despite continuous use
2Quantity of substance
If CO2 is stored in liquid state using pressure tank, then CO2 storage is achieved, but manufacturing cost and operation cost increase
Solution Approach 1:
Instead of forcing CO2 into liquid state through high pressure and low temperature (requiring expensive pressure tanks), the patent converts CO2 into solid carbonate compounds (Na2CO3, K2CO3, CaCO3, or BaCO3) through chemical reaction. This phase transition from gas to solid compound eliminates the need for expensive pressurized storage infrastructure
Solution Approach 2:
The patent transforms CO2 from a harmful greenhouse gas that requires expensive containment into valuable carbonate products. The CO2 reaction product (carbonate) serves as both a storage form and a useful chemical product, converting the waste problem into an economic opportunity and eliminating expensive storage requirements
3Object-generated harmful factors
If conventional CO2 capture technology is implemented, then CO2 removal is achieved, but economic feasibility deteriorates due to high energy consumption
Solution Approach 1:
The basic alkali mixed solution system is designed to be self-regenerating through the chemical reaction cycle. The unreacted base components remain in solution and can continue absorbing CO2, while the formed carbonates can be processed to regenerate the base. This self-service capability reduces external energy input and operational costs, improving economic feasibility
Solution Approach 2:
The system serves multiple functions: CO2 absorption, CO2 conversion to valuable products, and potential base regeneration. The basic alkali mixed solution can absorb CO2 efficiently and the resulting carbonates have commercial value, creating a multi-functional system that improves economic feasibility beyond simple CO2 removal
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 reduces carbon dioxide emissions, secures economic feasibility by minimizing energy consumption, and enables the conversion of captured carbon dioxide into valuable materials and hydrogen, offering stable and efficient storage and utilization.
Implementation Method 1
carbon dioxide is absorbed in an alkanolamine aqueous solution
Implementation Method 2
carbon dioxide in an exhaust gas is captured and converted into a carbon resource by using a basic alkali mixed solution
Implementation Method 3
the reactor is configured to separate a carbon dioxide reactant and a waste solution in the reactant
Implementation Method 4
a hydrogen generator configured to generate hydrogen gas by receiving the separated carbon dioxide from the reactor
Data Source
AI summary
Proposed is a system for capturing and recycling carbon dioxide and producing hydrogen for a cement manufacturing facility. The system includes a preheater provided with multiple stages of cyclones arranged in series in a vertical direction and configured to receive and preheat a cement raw material, a calciner configured to calcine the cement raw material preheated by the preheater, a kiln configured to burn the cement raw material calcined in the calciner, an exhaust line connected to the cyclones and configured to discharge an exhaust gas respectively discharged from the calciner and the kiln to the outside, a reactor configured to capture carbon dioxide in the exhaust gas, to collect a reactant containing the captured carbon dioxide, and to separate a carbon dioxide reactant and a waste solution in the reactant, and a hydrogen generator configured to generate hydrogen gas by receiving the separated carbon dioxide from the reactor.