Multi-Regeneration Reactor System for High Temperature Dry Desulfurization
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Solution Overview
Problem
High temperature dry desulfurization processes face efficiency decreases due to oxygen injection in the direct sulfur recovery process, leading to catalyst deterioration and reduced sulfur recovery efficiency.
Innovation Solution
A multi-regeneration reactor system is implemented, where two regeneration reactors operate alternately, with one used for solid recirculation and the other for regeneration, and a controller manages oxidizing agent supply to prevent oxygen flow into the sulfur recovery process, ensuring efficient desulfurizing agent regeneration and sulfur recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxidizing agent is injected into the regeneration reactor to regenerate the desulfurizing agent, then the desulfurizing agent is effectively regenerated, but oxygen flows into the sulfur recovery process causing catalyst deterioration and reduced sulfur recovery efficiency
Solution Approach 1:
The system divides the regeneration function into two separate reactors (first regeneration reactor and second regeneration reactor) that operate alternately. This segmentation allows one reactor to perform regeneration while the other handles sulfur recovery, preventing oxygen from contaminating the sulfur recovery process and protecting the catalyst.
Solution Approach 2:
The two regeneration reactors operate in periodic alternation, with one reactor in regeneration mode while the other is in sulfur recovery mode. This periodic switching ensures continuous operation while preventing harmful oxygen flow into the sulfur recovery process, thereby protecting catalyst activity and maintaining sulfur recovery efficiency.
2Device complexity
If a single regeneration reactor is used, then the system structure is simple, but continuous operation is difficult and sulfur recovery efficiency decreases
Solution Approach 1:
The regeneration function is segmented into two separate reactors that can operate independently and alternately. This allows one reactor to be in regeneration mode while the other maintains sulfur recovery operations, ensuring continuous productivity without requiring an overly complex multi-reactor system.
Solution Approach 2:
The system discards the limitation of single-reactor operation by implementing two reactors that alternate functions. One reactor is discarded for sulfur recovery while the other is recovered for regeneration, and vice versa, ensuring continuous operation and maintaining high sulfur recovery efficiency.
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 configuration prevents oxygen flow into the direct sulfur recovery process, maintaining catalyst activity and enhancing sulfur recovery efficiency by optimizing the regeneration process in high temperature dry desulfurization systems.
Implementation Method 1
the sulfur ingredients H2S and COS are absorbed into the desulfurizing agent by the reaction such as the following Formula 1 and Formula 2 and are to be emitted as H2O or CO2. H2S+ZnO=ZnS+H2O, COS+ZnO=ZnS+CO2
Implementation Method 2
ZnO and SO2 are obtained by oxidizing ZnS by injecting oxidizing agent (oxygen or air) to oxidizing agent inlet 32 of a lower portion of the regeneration reactor as like below Formula 3, and oxidized desulfurizing agent particles are recirculated to the desulfurization reactor by discharging them from the desulfurizing agent outlet 33. ZnS+1.5 O2=ZnO+SO2
Data Source
AI summary
A desulfurization system removes sulfur ingredients included in synthetic gas generated from gasification of coal in a high temperature dry state. The system includes a desulfurization reactor, a desulfurization cyclone, and first and second regeneration reactors branched with the desulfurization cyclone. A first oxidizing agent is injected to a first oxidizing agent inlet of the first regeneration reactor, and a second oxidizing agent is injected to a second oxidizing agent inlet of the second regeneration reactor. A controller operates one of the first and second regeneration reactors in a regeneration mode, controlling the other to operate in a desulfurization mode.