Highly Reactive Hydrated Lime for SO2 Removal in Circulating Dry Scrubbers
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Solution Overview
Problem
Current flue gas scrubbing technologies face challenges in efficiently removing sulfur dioxide (SO2) and sulfur trioxide (SO3) due to fast flue gas throughput and issues with sorbent clogging and corrosion, particularly in smaller industrial emitters seeking cost-effective solutions.
Innovation Solution
The use of highly reactive hydrated lime (HRH) with enhanced properties, such as high BET surface area and narrow particle size distribution, is injected into a circulating dry scrubber (CDS) to react with SO2, achieving faster neutralization and reduced sorbent requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional scrubbing materials are used, then the system can remove acid gases, but the sorbent requirements increase and operational issues such as clogging and corrosion occur
Solution Approach 1:
The patent changes the chemical and physical parameters of the sorbent material by using highly reactive hydrated lime (HRH) with specific properties: CaO content between 50-90%, BET surface area between 5-50 m²/g, and particle size distribution with D10 of 1-10 micrometers and D90 of 20-100 micrometers. These parameter changes enable faster reaction kinetics and improved removal efficiency while reducing the quantity of sorbent required
Solution Approach 2:
The patent employs a composite approach by combining hydrated lime with specific particle size distributions and surface area characteristics to create a multi-functional sorbent material that simultaneously achieves high reactivity, appropriate flow properties, and reduced clogging tendencies
2Productivity
If flue gas throughput is increased, then productivity improves, but removal efficiency decreases due to fast gas flow
Solution Approach 1:
The patent changes the reaction kinetics parameter by using HRH with enhanced reactivity due to its specific chemical composition and surface area characteristics. This allows the system to maintain high removal efficiency even at increased flue gas throughput rates, as the faster reaction kinetics compensate for the reduced residence time
Solution Approach 2:
The patent applies preliminary action by pre-processing the lime material to achieve specific reactivity characteristics before injection. The HRH is prepared with controlled particle size and surface area to ensure rapid reaction upon contact with flue gas, enabling efficient removal even at high throughput conditions
3Reliability
If sorbent injection is increased, then removal efficiency improves, but sorbent waste and operational issues increase
Solution Approach 1:
The patent optimizes the sorbent material parameters to achieve maximum reaction efficiency per unit mass. The HRH with specific CaO content, surface area, and particle size distribution ensures complete utilization of the injected sorbent, minimizing unreacted material and reducing sorbent waste while maintaining emission limits
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
HRH significantly improves SO2 removal efficiency, requiring less sorbent and maintaining desired emission limits across various load conditions, especially at low loads, while minimizing sorbent waste and operational issues.
Implementation Method 1
The compounds then react with the undesirable compounds which are intended to be removed. Through these reactions, the undesirable compounds are either captured and disposed of, or turned into a less harmful compound
Implementation Method 2
hydrated lime (HRH) with enhanced properties, such as high BET surface area
Data Source
AI summary
Systems and methods for the use of highly reactive hydrated lime (HRH) in circulating dry scrubbers (CDS) to remove sulfur dioxide (SO2) from the flue gas.