Clean Coal Composition With Soluble Sulfur Fixation
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Solution Overview
Problem
Existing sulfur-fixing agents for coal combustion are insoluble, leading to uneven mixing, coking, and reduced boiler efficiency, with limited sulfur fixation and combustion efficiency.
Innovation Solution
A method involving the use of a starch gelatinized solution to dissolve soluble sulfur-fixing agents like Ba(OH)2, Ca(HCO3)2, and Mg(HCO3)2, uniformly adsorbed onto coal particles, enhanced by amylases, to improve sulfur fixation and combustion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insoluble sulfur-fixing agents are used in coal combustion, then sulfur fixation can be achieved, but uneven mixing occurs leading to poor sulfur fixation effects and significant coking
Solution Approach 1:
The patent changes the physical-chemical parameter of the sulfur-fixing agent from insoluble to water-soluble form. Specifically, it uses water-soluble sulfates (such as CaSO4, BaSO4) instead of traditional insoluble sulfur-fixing agents. This parameter change enables the sulfur-fixing agent to be uniformly dissolved and mixed with coal slurry, achieving homogeneous distribution throughout the coal structure, thereby eliminating the uneven mixing problem while maintaining effective sulfur fixation.
Solution Approach 2:
The patent introduces water as an intermediary medium to facilitate uniform distribution of the sulfur-fixing agent. By using water-soluble sulfates that can be dissolved in the coal slurry preparation process, the sulfur-fixing agent is carried uniformly throughout the mixture by the water medium, ensuring even distribution before drying and combustion, thus resolving the mixing uniformity issue.
2Reliability
If insoluble sulfur-fixing agents are used, then sulfur fixation is possible, but coking occurs which reduces heat conduction efficiency of the boiler
Solution Approach 1:
The patent changes the solubility parameter of the sulfur-fixing agent from insoluble to water-soluble. By using water-soluble sulfates that can be uniformly distributed in the coal slurry, the sulfur-fixing agent is evenly embedded in the coal structure. This uniform distribution prevents localized concentration that would cause coking, thereby eliminating the harmful coking effect while maintaining sulfur fixation capability.
3Ease of manufacture
If physical coal washing is used for pre-combustion desulfurization, then the process is simple and low cost, but only inorganic sulfur can be removed
Solution Approach 1:
The patent creates a composite material system by combining coal with water-soluble sulfate sulfur-fixing agents. This composite approach integrates the simplicity of physical coal washing with the enhanced desulfurization capability of chemical sulfur fixation. The water-soluble sulfates are incorporated into the coal slurry during preparation, forming a composite structure that maintains process simplicity while achieving both inorganic and organic sulfur removal, thus improving desulfurization effectiveness without complicating the process.
4Reliability
If in-combustion desulfurization with sulfur-fixing agents is used, then SO2 can be fixed chemically, but slagging, wear, and clogging occur with higher costs and reduced boiler efficiency
Solution Approach 1:
The patent changes the chemical composition parameter of the sulfur-fixing agent to water-soluble sulfates. This parameter change allows the sulfur-fixing agent to be uniformly distributed in the coal slurry, preventing localized aggregation that causes slagging and wear. The uniform distribution ensures gentle and consistent sulfur fixation reactions, eliminating the harmful effects of slagging, wear, and clogging while maintaining high sulfur fixation efficiency.
Solution Approach 2:
The patent uses water-soluble sulfates as an intermediary that can be uniformly distributed through the coal slurry preparation process. This intermediary approach ensures even distribution of the sulfur-fixing agent, preventing localized reactions that would cause slagging and wear. The water-soluble nature allows for homogeneous mixing and gentle reaction conditions, eliminating the harmful effects associated with traditional insoluble sulfur-fixing agents.
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 method achieves uniform adsorption of sulfur-fixing agents, enhancing sulfur fixation and combustion efficiency without negative boiler impacts, with improved sulfur fixation performance and combustion efficiency.
Implementation Method 1
a starch gelatinized solution to dissolve soluble sulfur-fixing agents like Ba(OH)2, Ca(HCO3)2, and Mg(HCO3)2, uniformly adsorbed onto coal particles
Implementation Method 2
enhanced by amylases
Implementation Method 3
The sulfur fixation reaction occurs between SO2 or SO3 and these metal oxides, ultimately forming sulfates or sulfites
Data Source
AI summary
The present disclosure relates to a clean coal for combustion and a preparation method thereof. The preparation method includes the following steps: (1) dispersing starch in water, uniformly stirring, and fully gelatinizing; (2) adding a sulfur-fixing agent into the gelatinization solution, and centrifuging to obtain the starch gelatinized solution containing the sulfur-fixing agent; (3) crushing the coal for combustion to obtain coal particles; and (4) conveying the coal particles to a fluidized bed, spraying the starch gelatinized solution containing the sulfur-fixing agent on the coal particles in a suspension state, and drying to obtain coal particles adsorbed with the sulfur-fixing agent and gelatinized starch. According to the present disclosure, the starch gelatinized solution is used to dissolve the soluble sulfur-fixing agent, and then the starch solution is adsorbed in-situ into the coal particles, so that the soluble sulfur-fixing agent is uniformly adsorbed in the coal for combustion.