Flue Gas Mist Agglomeration for Amine Absorbent Recovery
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Solution Overview
Problem
Current flue gas treatment systems face challenges in suppressing the release of mist-like amine absorbents, which reduces the amount of CO2 absorbent available for CO2 removal and necessitates replenishment, and mist generating substances in the CO2 recovery apparatus lead to increased CO2 absorbent scattering outside the system.
Innovation Solution
A flue gas treatment system incorporating a desulfurization apparatus, a mist collection/agglomeration apparatus that forms agglomerated and bloated mist, and a mist collection unit to collect CO2 absorbent bloated mist, with a flow velocity exceeding critical filtration wind velocity for effective mist collection, and optionally including a washing unit and wire mesh or charging for enhanced mist collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a CO2 absorption tower with amine-based absorbent is used to remove CO2 from flue gas, then CO2 removal efficiency is improved, but amine absorbent is entrained in the discharged flue gas causing loss of substance
Solution Approach 1:
The flue gas treatment system is divided into multiple functional segments: a CO2 absorption tower for CO2 removal, a washing unit for初步 cleaning, and a mist collection unit for fine particle capture. This segmentation allows each unit to address specific aspects of absorbent loss, with the washing unit handling bulk removal and the mist collection unit capturing entrained droplets, thereby reducing overall amine absorbent loss while maintaining CO2 removal efficiency
Solution Approach 2:
A mist collection unit is introduced as an intermediary component between the CO2 absorption tower and the discharge point. This unit uses a mist collecting medium to intercept and collect amine absorbent droplets entrained in the flue gas stream, acting as a mediator that prevents the absorbent from being released to the atmosphere while allowing the treated gas to pass through
2Loss of substance
If multiple stages of washing units are added to recover amine compound, then amine absorbent loss is reduced, but device complexity increases
Solution Approach 1:
The washing unit and mist collection unit are combined into an integrated system where the washing unit performs preliminary separation and the mist collection unit handles fine particle capture. This merging of functions into a coordinated two-stage system reduces amine absorbent loss more effectively than either unit alone, while keeping the overall complexity manageable through functional integration rather than separate independent systems
Solution Approach 2:
Different regions of the gas flow path are treated with different levels of cleaning intensity. The washing unit provides bulk liquid-gas separation in the initial stage, while the mist collection unit provides fine particle capture in the final stage. This local differentiation of cleaning quality allows efficient absorbent recovery without applying excessive complexity uniformly throughout the entire system
3Productivity
If mist generating substances are present in flue gas, then CO2 absorbent scattering outside the system increases, but additional mist collection equipment is required
Solution Approach 1:
The mist collection unit is positioned downstream of the CO2 absorption tower to perform preliminary collection of large droplets and mist before the gas is discharged. By placing this collection mechanism in advance of the discharge point, the system prevents CO2 absorbent scattering outside the system while maintaining the CO2 removal capacity of the absorption tower
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 suppresses the entrainment of CO2 absorbent when treated flue gas is discharged, improving the efficiency and reducing the need for absorbent replenishment by effectively collecting and reusing the CO2 absorbent through the mist collection/agglomeration and washing processes.
Implementation Method 1
a mist collection/agglomeration apparatus which is provided on a downstream side of the desulfurization apparatus and forms agglomerated and bloated mist by causing particles of mist contained in the flue gas to be bonded together and have bloated particle sizes
Implementation Method 2
CO2 in the flue gas is absorbed by the CO2 absorbent during countercurrent contact through a chemical reaction (exothermic reaction) by using the amine-based CO2 absorbent
Implementation Method 3
a mist collection unit which is provided on a gas flow downstream side of the CO2 absorption unit and collects CO2 absorbent bloated mist bloated by the CO2 absorbent being absorbed by the agglomerated and bloated mist in the CO2 absorption unit
Data Source
AI summary
Provided are: a wet desulfurization apparatus 13 which removes sulfur oxides in flue gas 12A from a boiler 11; a mist collection/agglomeration apparatus 14 which is provided on a downstream side of the desulfurization apparatus 13 and forms agglomerated SO3 mist by causing particles of SO3 mist contained in flue gas 12B from the wet desulfurization apparatus 13 to be bonded together and have bloated particle sizes; a CO2 recovery apparatus 18 constituted by a CO2 absorption tower 16 having a CO2 absorption unit 16A which removes CO2 contained in flue gas 12D by being brought into contact with a CO2 absorbent and an absorbent regeneration tower 17 which recovers CO2 by releasing CO2 from the CO2 absorbent having absorbed CO2 and regenerates the CO2 absorbent; and a mist collection unit 16C which collects CO2 absorbent bloated mist bloated by the CO2 absorbent being absorbed by the agglomerated SO3 mist in the CO2 absorption unit 16A.