Wet Desulfurization Apparatus with Segmented pH Zones
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Solution Overview
Problem
Contemporary wet desulfurization apparatuses face a trade-off between sulfur oxide absorption rate and gypsum quality due to operating at a single pH value, which limits both desulfurization efficiency and gypsum quality.
Innovation Solution
The apparatus is partitioned into two regions with different pH values for alkaline slurries, allowing for improved desulfurization efficiency and gypsum quality by using a multi-tiered slurry spray structure and controlled slurry transfer to optimize gas-liquid contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single pH value is used for alkaline slurry in wet desulfurization, then the system is simple to operate, but both desulfurization efficiency and gypsum quality cannot be optimized simultaneously
Solution Approach 1:
The wet desulfurization system is segmented into two distinct regions: a first chamber region using alkaline slurry with pH 4.5-5.0 optimized for gypsum quality, and a second chamber region using alkaline slurry with pH 5.5-6.0 optimized for SO2 absorption rate. This segmentation allows each region to operate at its optimal pH independently, resolving the contradiction between operational simplicity and desulfurization efficiency.
Solution Approach 2:
Different pH conditions are applied to different spatial locations within the desulfurization apparatus. The first chamber region maintains pH 4.5-5.0 for high-quality gypsum production, while the second chamber region maintains pH 5.5-6.0 for maximum sulfur oxide absorption. This local quality differentiation enables simultaneous optimization of both gypsum quality and desulfurization efficiency without compromising operational simplicity.
2Productivity
If pH is maintained at 5.0 or more to improve SO2 absorption rate, then desulfurization efficiency improves, but the quality of gypsum deteriorates
Solution Approach 1:
The absorption chamber is segmented into two regions with different pH conditions. The first chamber region operates at pH 4.5-5.0 where gypsum quality is optimized, while the second chamber region operates at pH 5.5-6.0 where SO2 absorption rate is optimized. This segmentation eliminates the trade-off by allowing each region to function at its optimal pH without interfering with the other.
Solution Approach 2:
Different pH quality conditions are applied locally to different chamber regions. The first chamber region maintains lower pH (4.5-5.0) specifically for high-quality gypsum production, while the second chamber region maintains higher pH (5.5-6.0) specifically for maximum SO2 absorption. This local quality approach resolves the contradiction between absorption rate and gypsum quality.
3Manufacturing precision
If pH is lowered to 4.0-5.0 to improve gypsum quality, then gypsum quality improves, but the SO2 absorption rate decreases
Solution Approach 1:
The system is divided into two functional segments: the first chamber region operates at pH 4.5-5.0 optimized for gypsum crystallization and quality, while the second chamber region operates at pH 5.5-6.0 optimized for SO2 absorption kinetics. This segmentation ensures that neither function compromises the other, allowing both high gypsum quality and high absorption rate to coexist.
Solution Approach 2:
Optimal pH conditions are applied locally to match the specific requirements of each chamber region. The first chamber region uses pH 4.5-5.0 locally to maximize gypsum quality, while the second chamber region uses pH 5.5-6.0 locally to maximize SO2 absorption rate. This local optimization eliminates the need to compromise either gypsum quality or absorption rate.
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
This approach enhances both desulfurization efficiency and gypsum quality by optimizing pH conditions in each region, improving the overall performance of the desulfurization process.
Implementation Method 1
acid gas is absorbed through gas-liquid contact in the chamber
Implementation Method 2
SO2(g)+H2O→H2SO3(aq) H2SO3(aq)↔H++HSO3−↔2H++SO32−
Implementation Method 3
Ca2++SO42−+2H2O→CaSO4.2H2O(s)
Implementation Method 4
acid gas is absorbed through gas-liquid contact in the chamber
Data Source
AI summary
A wet desulfurization apparatus includes a chamber enclosing a space for passing flue gas and including a first barrier partitioning the space into first and second chamber regions, a flue gas inlet to introduce raw flue gas into the first chamber region, and a flue gas outlet to discharge desulfurized flue gas from the second chamber region; a second barrier partitioning a slurry reservoir into a first reservoir part to store a first pH alkaline slurry and a second reservoir part to store a second pH alkaline slurry; a first sprayer to spray the alkaline slurry from the first reservoir part into the first chamber region to remove sulfur from the flue gas in the first chamber region; and a second sprayer to spray the alkaline slurry from the second reservoir part into the second chamber region to remove sulfur from the flue gas in the second chamber region.