Flue Gas Treatment Apparatus with Dust Particle Recirculation
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Solution Overview
Problem
Conventional flue gas treatment apparatuses face high operation costs and purity degradation issues due to excessive calcium carbonate usage, leading to inefficient SO3 removal and increased dust concentration.
Innovation Solution
A flue gas treatment apparatus and method that incorporates a treatment agent feeding system, temperature decreasing means, electric dust collection, and a lime-gypsum desulfurization process, with a circulation mechanism to reuse dust particles as the treatment agent, optimizing the amount of dust particles and treatment agent to maintain efficient SO3 removal while reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large amount of calcium carbonate is fed to increase the probability of contact with SO3, then SO3 removal efficiency is improved, but operation cost increases due to increased calcium carbonate consumption
Solution Approach 1:
The patent recovers dust particles containing calcium carbonate that would otherwise be discarded and reuses them as treatment agent. The dust collection apparatus captures calcium carbonate particles carried by flue gas, and the circulation system returns these particles to the injection point, creating a closed-loop system that reduces calcium carbonate consumption while maintaining SO3 removal efficiency.
Solution Approach 2:
The system uses the flue gas itself to transport and deposit the calcium carbonate treatment agent onto dust particles, which then serve as the active SO3 removal medium. The flue gas flow naturally carries the calcium carbonate to the dust collection apparatus, eliminating the need for additional feeding mechanisms and reducing operational costs.
2Productivity
If a large amount of calcium carbonate is used to remove SO3, then SO3 removal efficiency is improved, but the purity of gypsum generated by the desulfurization apparatus degrades
Solution Approach 1:
The patent extracts and removes dust particles containing excess calcium carbonate from the flue gas stream before they reach the desulfurization apparatus. The dust collection apparatus separates these particles, preventing them from contaminating the gypsum production process, thereby maintaining gypsum purity while still providing adequate SO3 removal.
Solution Approach 2:
The system segments the flue gas treatment process into distinct stages: SO3 removal using calcium carbonate on dust particles, dust collection to separate excess calcium carbonate, and desulfurization to produce gypsum. This segmentation allows each process to operate independently with optimized parameters, preventing calcium carbonate excess from degrading gypsum purity.
3Productivity
If an excessively large amount of calcium carbonate is used to remove SO3, then SO3 removal efficiency is improved, but the level of dust concentration at the outlet of the flue gas desulfurization apparatus increases
Solution Approach 1:
The patent extracts and removes excess dust particles containing calcium carbonate from the flue gas stream using the dust collection apparatus. This extraction prevents excessive dust from reaching the desulfurization apparatus outlet, maintaining acceptable dust concentration levels while preserving SO3 removal efficiency through the circulated calcium carbonate.
Solution Approach 2:
The system implements feedback by monitoring and controlling the circulation of dust particles containing calcium carbonate. The circulation system adjusts the amount of dust returned to the injection point based on process conditions, ensuring adequate SO3 removal while preventing excessive dust concentration at the outlet.
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 solution significantly reduces operational costs while maintaining effective SO3 removal efficiency and preventing purity degradation of gypsum, thereby controlling dust concentration and maintaining a high level of treatment agent effectiveness.
Implementation Method 1
calcium carbonate (CaCO3) is fed by injection for adsorption of SO3 at a location downstream of a denitrification apparatus, and thus, SO3 is separated and removed as gypsum
Implementation Method 2
the temperature of the flue gas is lowered to a temperature at which SO3 in the flue gas changes into SO3 fumes
Implementation Method 3
an electric dust collection apparatus provided in a flue arranged on a downstream side of the temperature decreasing means
Data Source
AI summary
A flue gas treatment apparatus for removing sulfur contents contained in combustion flue gas, includes a treatment agent feeder to feed a treatment agent into a flue through which the combustion flue gas flows, a cooler to cool the combustion flue gas to which the treatment agent has been fed and condense SO3 components in the combustion flue gas, an electric dust collection apparatus provided in the flue, a desulfurization apparatus based on a lime-gypsum process, and a circulation line for feeding a portion of the dust particles recovered by the electric dust collection apparatus into the flue that is provided on an upstream side of the cooler in the direction of flow of the flue gas for circulated use thereof as the treatment agent.