Alkaline Earth Carbonate Sorbent Thermal Activation
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Solution Overview
Problem
Current dry flue gas cleaning methods using alkaline earth metal carbonate and hydroxide sorbents are inefficient due to high sorbent consumption and incomplete reaction, leading to reduced absorption capacity and increased costs.
Innovation Solution
Thermal activation of materials containing alkaline earth metal carbonate and hydroxide by heating between 200°C and 850°C, particularly between 250°C and 750°C, to enhance their absorption capacity for sulfur oxides and other pollutants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If dry exhaust gas cleaning is used with alkaline earth metal carbonate and hydroxide sorbents, then exhaust gases can be cleaned, but sorbent consumption is very high
Solution Approach 1:
The sorbent is pre-heated to temperatures between 200-850°C before use in the bulk layer filter. This preliminary thermal activation removes surface moisture and activates the sorbent material, enabling it to react more completely with acidic pollutants and thereby reducing overall sorbent consumption.
Solution Approach 2:
The invention changes the temperature parameter of the sorbent from ambient to elevated temperatures (200-850°C) through pre-heating. This parameter change activates the sorbent material, significantly improving its reaction efficiency with sulfur oxides and other acidic components, thus reducing the amount of sorbent needed.
2Object-affected harmful factors
If sorbent is used in bulk layer filter, then acidic pollutants can be separated, but reaction products form a layer that closes the reactive surface
Solution Approach 1:
The sorbent undergoes preliminary thermal activation before being placed in the filter. This pre-treatment creates a more reactive surface that can accommodate reaction products without quickly becoming passivated, maintaining reactive surface availability throughout the sorbent's service life.
Solution Approach 2:
By changing the temperature parameter through pre-heating, the sorbent's surface properties are modified to prevent rapid formation of passivating layers. The thermal activation alters the surface chemistry, allowing sustained reactivity even as reaction products accumulate.
3Loss of substance
If sorbent consumption is reduced by mechanical reprocessing, then unreacted sorbent can be reused, but the method is insufficient in increasing absorption capacity
Solution Approach 1:
Instead of reprocessing after use, the invention applies preliminary thermal activation before the sorbent is put into service. This pre-treatment fundamentally enhances the sorbent's absorption capacity from the outset, making mechanical reprocessing unnecessary for achieving high absorption performance.
Solution Approach 2:
The invention permanently changes the sorbent's physical and chemical parameters through thermal activation at 200-850°C. This parameter change increases the specific surface area and reactivity of the sorbent particles, dramatically improving absorption capacity without requiring mechanical reprocessing cycles.
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 increases the sorbent's absorption capacity, reducing the need for sorbent material and improving pollutant separation efficiency in dry flue gas cleaning processes.
Implementation Method 1
The invention is based on the finding that the absorption capacity of materials (sorbents) containing alkaline earth metal carbonate and/or alkaline earth metal hydroxide can be significantly increased by a single heating to temperatures between approximately 200° C. and approximately 850° C.
Implementation Method 2
Sorbents based on limestone (CaCO 3 ), in particular granulated or pelleted products based on limestone (CaCO 3 ) and/or hydrated lime (Ca(OH) 2 ) and/or the corresponding dolomitic products, are used here. In these filters, the exhaust gas to be cleaned flows through a granular bulk layer of material containing alkaline earth metal carbonate and/or alkaline earth metal hydroxide. Here, the acidic exhaust gas components are separated on the material (sorbent) containing alkaline earth metal carbonate and/or alkaline earth metal hydroxide.
Data Source
Figure 1~2
AI summary
A method for increasing the absorption capacity of a material containing alkaline earth carbonate and/or alkaline earth hydroxide towards sulfur oxides and/or other pollutants, particularly in flue gas, characterized in that the material containing alkaline earth carbonate and/or alkaline earth hydroxide is activated by heating to approximately 200°C to approximately 850°C.