Hydrogel-Modified Lime Sorbent for Clogging-Resistant Flue Gas Treatment
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Solution Overview
Problem
Existing circulating dry scrubber (CDS) technologies face limitations in water content, leading to sticky behavior and clogging phenomena in ducts and reactors, which negatively impact the flue gas treatment process.
Innovation Solution
A lime-based sorbent comprising at least 70 wt.% Ca(OH)2 and 0.2 to 10 wt.% hydrogel-forming additives, such as superabsorbent polymers or cellulose ethers, allows for increased water content without clogging, maintaining flowability and enhancing pollutant capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water content is increased to improve pollutant removal performance, then capture levels of acid gases are improved, but sticky behavior and clogging phenomena occur in ducts and reactors
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the sorbent material. Specifically, it controls the Ca(OH)2 content to be at least 70 wt.% and limits aluminum compounds to 0.1-5 wt.% and silicon compounds to 0.1-5 wt.%, creating optimal chemical conditions that prevent sticky behavior while maintaining high water content for effective pollutant capture.
Solution Approach 2:
The patent uses composite materials by combining multiple components in specific proportions: calcium hydroxide (Ca(OH)2) as the primary sorbent material, with controlled amounts of aluminum compounds and silicon compounds. This composite structure leverages the complementary properties of each component to achieve both high pollutant removal efficiency and operational stability without clogging.
2Productivity
If water is added to reactivate residues and improve capture levels, then flue gas treatment effectiveness is improved, but clogging phenomena appear in the reactor
Solution Approach 1:
The patent modifies the chemical composition parameters of the sorbent to include at least 70 wt.% Ca(OH)2 with controlled aluminum (0.1-5 wt.%) and silicon (0.1-5 wt.%) compounds. This composition change enables the material to maintain reactivity with water for pollutant capture while preventing the clogging phenomena that normally occur when water is added to reactivate residues.
Solution Approach 2:
The patent employs a composite material system where calcium hydroxide serves as the reactive component for pollutant capture, while aluminum and silicon compounds in controlled amounts act as modifiers that prevent clogging. This composite structure allows water to be effectively used for reactivation without causing operational problems in the reactor.
3Productivity
If maximum water content (10 wt.%) is used in recirculated residue, then pollutant capture is optimized, but sticky behavior occurs on duct walls
Solution Approach 1:
The patent optimizes the chemical composition parameters by setting Ca(OH)2 content to at least 70 wt.% and limiting aluminum compounds to 0.1-5 wt.% and silicon compounds to 0.1-5 wt.%. This precise parameter control enables the sorbent to maintain optimal pollutant capture at 10 wt.% water content while preventing sticky behavior on duct walls through the balanced chemical composition.
Solution Approach 2:
The patent uses a composite material formulation where calcium hydroxide provides the primary pollutant capture function, while aluminum and silicon compounds in controlled proportions modify the surface properties to prevent sticky behavior. This composite approach allows the system to operate at maximum water content (10 wt.%) for optimal capture without generating harmful sticky effects.
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 sorbent sustains multiple cycles with improved water capture and release, reducing clogging and enhancing pollutant removal efficiency in CDS facilities.
Implementation Method 1
A lime-based sorbent comprising at least 70 wt.% Ca(OH)2 and 0.2 to 10 wt.% hydrogel-forming additives, such as superabsorbent polymers or cellulose ethers
Implementation Method 2
The sorbent sustains multiple cycles with improved water capture and release, reducing clogging and enhancing pollutant removal efficiency in CDS facilities
Data Source
AI summary
Lime-based sorbent suitable for use in a flue gas treatment process comprising at least 70 wt. % of Ca(OH)2 and at least 0.2 wt. % to at most 10 wt. % of a first additive selected among the group of hydrogels of natural or synthetic origin, in particular superabsorbent polymers (SAPs) or in the group of cellulose ethers or a combination thereof, premix for use in a manufacturing process of said sorbent, process for manufacturing the sorbent and use of said sorbent in a flue gas treatment process.