Desulfurization Slurry Suspension Bed Reactor
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Solution Overview
Problem
Existing desulfurization processes, particularly those using fluidized beds, suffer from low efficiency, complex operations, high costs, and secondary pollution, failing to meet industrial requirements for small and medium-sized projects.
Innovation Solution
A renewable high-efficient desulfurization process using a suspension bed with a desulfurization slurry made from amorphous iron oxide hydroxide, where the slurry is mixed with hydrogen sulfide-containing gas and passed through a suspension bed reactor for contact and reaction, followed by gas-liquid separation, additional desulfurization in a fixed bed, and regeneration through flash evaporation with an oxygen-containing gas, recycling the barren solution as slurry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fluidized bed is used for desulfurization, then the desulfurizer can be circulated and reused, but the gas-solid contact is nonuniform and desulfurization efficiency is low
Solution Approach 1:
The patent employs a dynamic suspension bed system where the slurry is continuously circulated between the absorption tower and regeneration device. The bed material is suspended in the gas stream and continuously moved, creating dynamic contact between gas and solid phases. This dynamic operation allows the desulfurizer to be reused while maintaining uniform gas-solid contact, resolving the contradiction between productivity and device complexity.
2Productivity
If lime slurry is directly used as desulfurizer, then desulfurization can be achieved, but mortar pipelines are prone to fouling and clogging and flow resistance is high
Solution Approach 1:
The patent changes the physical and chemical parameters of the desulfurizer by using amorphous iron oxide hydroxide with specific particle size distribution (0-20 μm) and controlling the slurry concentration (1-5 wt%). These parameter changes prevent pipeline fouling and clogging while maintaining high desulfurization capacity, thus resolving the contradiction between productivity and ease of operation.
3Productivity
If oxidation reduction method is used for desulfurization, then organic sulfides can be removed, but sour gas loading is low and solution circulation is large and operation costs are high
Solution Approach 1:
The patent implements a regeneration system where the spent desulfurization slurry is regenerated in a separate device and reused. The rich solution is regenerated by contacting with air or oxygen-containing gas to restore the desulfurizing components. This recovery process eliminates the need for continuous fresh slurry circulation, reducing operation costs and energy consumption while maintaining high desulfurization capacity.
4Productivity
If a suspension bed reactor with long dwell time is used, then desulfurization efficiency increases, but the reactor volume and equipment size increase
Solution Approach 1:
The patent employs continuous circulation of the desulfurization slurry between the absorption tower and regeneration device. The slurry continuously contacts the gas phase in the suspension bed, maintaining persistent desulfurization action. This continuous operation achieves high desulfurization efficiency without requiring excessive reactor volume, as the same slurry is reused multiple times through continuous circulation.
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 process achieves desulfurization efficiency of 98% or more, with regeneration efficiency of 65%-83%, reducing hydrogen sulfide content to 50 ppm or less, and recycling the barren solution without secondary pollution, making it suitable for industrial use with low investment and simple equipment.
Implementation Method 1
mixing a desulfurizer with water uniformly to prepare a desulfurization slurry; mixing the desulfurization slurry with a hydrogen sulfide containing gas to obtain a first mixture, and passing the first mixture into a suspension bed reactor
Implementation Method 2
subjecting the rich solution to flash evaporation and then reacting with an oxygen-containing gas to realize regeneration
Implementation Method 3
subjecting the rich solution to flash evaporation and then reacting with an oxygen-containing gas to realize regeneration to produce a barren solution which is then recycled
Data Source
AI summary
Provided is a renewable high efficient desulfurization process using a suspension bed, comprising mixing the desulfurization slurry with a hydrogen sulfide containing gas to obtain a first mixture, and passing the first mixture into a suspension bed reactor from bottom to top, with controlling the first mixture to have a dwell time of 5-60 minutes in the suspension bed reactor to allow they contact and react sufficiently with each other; and subjecting a second mixture obtained from the reaction to gas liquid separation to produce a rich solution and a purified gas, feeding the purified gas into a fixed bed reactor for carrying out a second desulfurization to obtain a second purified gas, subjecting the resulting rich solution to flash evaporation and then reacting with an oxygen-containing gas for carrying out regeneration. The process may reduce the sulfur content in the hydrogen sulfide containing gas from 2.4-140 g/Nm3 to 50 ppm or less by using a suspension bed, and further reduce the sulfur content to less than 10 ppm in conjunction with a fixed bed. The invention achieves high efficient desulfurization by combining the suspension bed with the fixed bed connected in series. The present invention has high regeneration efficiency, and the barren solution may be recycled for being used as the desulfurization slurry, without generating secondary pollution, which is very suitable for industrial promotion.