Calcium Cycle Integration for Cement Plant CO2 Capture
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Solution Overview
Problem
Cement production plants are significant contributors to atmospheric CO2 emissions due to the calcination processes, leading to global warming, and existing CO2 capture methods do not effectively utilize raw materials and residual energy from cement plants.
Innovation Solution
Integration of the calcium cycle process with cement plants, utilizing raw materials and subproducts to capture CO2, recycling calcium oxide, and utilizing exothermic reaction energy to produce steam for electricity generation, thereby reducing emissions and increasing plant productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If calcium cycle process is integrated with cement plant, then CO2 capture efficiency is improved, but device complexity increases
Solution Approach 1:
The calcium cycle process is merged with the cement plant operations by integrating the carbonation reactor, calcination reactor, and CO2 separation system into the existing cement production workflow. The purified CO2 from cement kiln flue gas is combined with process steam and sent to enhanced oil recovery sites, creating a unified system that simultaneously captures CO2 and generates commercial value.
Solution Approach 2:
The integrated system performs multiple functions: capturing CO2 from cement kiln emissions, producing purified CO2 for commercial use, generating steam for power generation, and providing enhanced oil recovery. This multi-functionality resolves the contradiction by making the complexity worthwhile through multiple benefits.
2Productivity
If calcium cycle process is integrated with cement plant, then productivity is improved, but device complexity increases
Solution Approach 1:
The system uses its own waste heat and byproducts to sustain operations. The exothermic carbonation reaction provides heat for the endothermic calcination process, and the purified CO2 is utilized for enhanced oil recovery, creating a self-sustaining system that improves productivity without proportionally increasing operational complexity.
Solution Approach 2:
Waste CO2 emissions from the cement plant are recovered and purified for commercial use in enhanced oil recovery. The system transforms a waste product into a valuable resource, improving productivity by creating additional revenue streams while managing emissions.
3Loss of energy
If calcium cycle process is integrated with cement plant, then energy utilization is improved, but device complexity increases
Solution Approach 1:
The system changes the temperature and pressure parameters of the CO2 stream through the carbonation and calcination processes. The CO2 is heated to high temperatures in the carbonation reactor, then cooled and condensed in the separation system, transforming it into a liquid suitable for enhanced oil recovery. These parameter changes enable energy recovery and utilization.
Solution Approach 2:
The CO2 undergoes phase transitions from gas to liquid during the separation and condensation process. This phase change enables the CO2 to be transported and injected into oil reservoirs for enhanced recovery, while the phase transition itself releases latent heat that can be utilized for energy generation.
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 method captures approximately 80% of CO2 emissions, recycles calcium oxide, and generates electricity, reducing greenhouse gas emissions and enhancing cement plant efficiency.
Implementation Method 1
contacting said combustion gases containing CO2 with a solid stream having a high CaO content inside a first fluidized bed reactor in order to produce an exothermic reaction between the CO2 and the CaO for producing a solid-gas mixture comprised by a CaCO3 stream
Implementation Method 2
feeding said solid-gas stream to a cyclone for separating the solids from the gaseous stream and obtaining CaC03 solids and a hot gaseous having a CO2 content; feeding the CaCO3 solids into a second fluidized bed reactor to which it is provided heat by means of a combustion reaction, in order to decarbonate the CaCO3 and produce a solid-gas mix comprised by a solid CaO stream and a gas stream comprised mainly by hot CO2
Implementation Method 3
feeding said solid-gas stream to a cyclone for separating the solids from the gaseous stream
Implementation Method 4
contacting said combustion gases containing CO2 with a solid stream having a high CaO content inside a first fluidized bed reactor
Data Source
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AI summary
A method for capturing CO2 produced by cement plants by using the calcium cycle method comprising the integration of the process known as calcium cycle to the cement plant by using the cement plant raw materials and sub products in the calcium cycle plant and by using the calcium cycle plant raw materials, sub products and residual energy in the cement plant.