Flue Gas Purification Composite Powder
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Solution Overview
Problem
Existing dry flue gas purification methods face challenges with the storability, flowability, and absorptivity of sodium salts of carbonic acid, such as sodium hydrogen carbonate, which tend to reagglomerate, lose flowability, and require costly on-site grinding, leading to increased equipment maintenance and costs.
Innovation Solution
A composition combining 1 to 99 wt.% of a powder of a sodium salt of carbonic acid with 1 to 99 wt.% of a powder of an absorptive material having a specific pore volume of at least 0.1 cm3/g, which improves flowability and absorptivity of pollutants like sulfur oxides and hydrogen halides, particularly using sodium hydrogen carbonate and hydrated lime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sodium salt of carbonic acid is ground to fine powder with small particle size to increase surface area and absorptivity, then absorptivity of pollutants is improved, but storability and flowability deteriorate due to reagglomeration
Solution Approach 1:
The patent combines sodium salt of carbonic acid with inert materials (such as silica, alumina, or metal oxides) to create a composite powder mixture. This composite approach maintains the high surface area and absorptivity of the sodium salt while the inert materials prevent reagglomeration during storage, thereby improving both absorptivity and storability simultaneously.
Solution Approach 2:
The patent utilizes porous inert materials as carriers or additives in the composition. The porous structure provides surface area and prevents densification during storage, while the sodium salt of carbonic acid fills the pores to maintain reactivity. This porous material approach preserves flowability and prevents reagglomeration while maintaining high absorptivity.
2Reliability
If sodium salt of carbonic acid is ground to fine powder with small particle size to increase surface area and absorptivity, then absorptivity of pollutants is improved, but flowability deteriorates due to reagglomeration
Solution Approach 1:
The patent combines sodium salt of carbonic acid with inert materials (such as silica, alumina, or metal oxides) to create a composite powder mixture. This composite approach maintains the high surface area and absorptivity of the sodium salt while the inert materials prevent reagglomeration during storage, thereby improving both absorptivity and storability simultaneously.
Solution Approach 2:
The patent utilizes porous inert materials as carriers or additives in the composition. The porous structure provides surface area and prevents densification during storage, while the sodium salt of carbonic acid fills the pores to maintain reactivity. This porous material approach preserves flowability and prevents reagglomeration while maintaining high absorptivity.
3Reliability
If sodium salt of carbonic acid is ground on-site immediately before use to maintain low d50 and prevent reagglomeration, then absorptivity is maintained, but equipment complexity and maintenance costs increase
Solution Approach 1:
The patent pre-mixes the sodium salt of carbonic acid with inert materials during manufacturing, creating a stable composite powder that can be stored without requiring on-site grinding equipment. This preliminary action eliminates the need for complex on-site grinding machinery while maintaining the desired particle size distribution and absorptivity properties.
Solution Approach 2:
The patent combines sodium salt of carbonic acid with inert materials (such as silica, alumina, or metal oxides) to create a composite powder mixture. This composite approach maintains the high surface area and absorptivity of the sodium salt while the inert materials prevent reagglomeration during storage, thereby improving both absorptivity and storability simultaneously.
4Reliability
If multiple separate injection systems are used for simultaneous injection of sodium hydrogen carbonate and hydrated lime, then purification effectiveness is improved, but system cost increases
Solution Approach 1:
The patent combines sodium hydrogen carbonate and hydrated lime into a single mixed powder composition that can be injected through one injection system. This merging of multiple absorbents into a single formulation simplifies the injection system requirements while maintaining the purification effectiveness of using both absorbents simultaneously.
Solution Approach 2:
The patent combines sodium salt of carbonic acid with inert materials (such as silica, alumina, or metal oxides) to create a composite powder mixture. This composite approach maintains the high surface area and absorptivity of the sodium salt while the inert materials prevent reagglomeration during storage, thereby improving both absorptivity and storability simultaneously.
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 composition maintains a high surface area, prevents reagglomeration, and enhances sulfur oxide absorptivity while maintaining flowability over time, reducing the need for on-site grinding and equipment costs, with hydrated lime showing particularly beneficial effects.
Implementation Method 1
the absorbent is normally brought into contact with the flue gas in the dry state. After absorption, the dry reaction products are normally collected downstream
Implementation Method 2
said powder of said absorptive material has a specific pore volume that is equal to or greater than 0.1 cm3/g
Data Source
AI summary
The invention relates to a composition for the purification of flue gas containing 1 to 99 wt.% of a powder of a sodium salt of carbonic acid and 1 to 99 wt.% of a powder of an absorptive material, wherein the powder of an absorptive material has a specific pore volume that is equal to or greater than 0.1 cm3/g. The invention also relates to a process for dry flue gas purification and the use of an absorptive material to improve the flowability and/or storability and/or HF absorptivity of a sodium salt of carbonic acid.