Cement Pre-Coating of Pyrolysis Char for Stronger Char Bricks
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Solution Overview
Problem
Conventional pre-coating processes for pyrolysis char lack desirable characteristics, and there is a need for environmentally friendly methods to create char bricks with improved surface binding strength and reduced environmental impact.
Innovation Solution
A method involving forming a cement paste, soaking pyrolysis char in it to create coated pyrolysis char, and sieving and drying the coated char to enhance binding strength, or mixing pyrolysis char with cement and water to form a wet mixture and drying it, or soaking pyrolysis char in water and mixing with cement to form coated pyrolysis char, followed by drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional pre-coating processes are used for pyrolysis char, then the process is simple, but the surface binding strength is insufficient
Solution Approach 1:
The patent applies preliminary action by pre-coating the pyrolysis char with cement paste before final brick formation. This preliminary coating step enhances the surface binding strength of the char, allowing for stronger aggregate bonding in the final product without requiring complex additional equipment or processes.
2Reliability
If pyrolysis char is used without coating, then the environmental impact is reduced, but the binding strength and durability are insufficient
Solution Approach 1:
The patent changes the physical and chemical parameters of the pyrolysis char surface by applying a cement coating. This coating modifies the surface properties to enhance durability and binding strength while the use of pyrolysis char itself (a waste product) ensures that the overall environmental impact is reduced through waste utilization and carbon sequestration.
3Strength
If cement paste is applied to pyrolysis char, then the surface binding strength increases, but the manufacturing steps increase
Solution Approach 1:
The patent merges the pre-coating operation with the aggregate mixing process. The cement-coated pyrolysis char is directly mixed with other aggregates and cement paste in a single mixing step, eliminating the need for separate coating and mixing operations. This integration maintains the strength benefits while improving manufacturing 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
The methods increase the surface binding strength of pyrolysis char, resulting in char bricks with increased compressive, flexural, and tensile strength, and improved freeze-thaw durability, while reducing environmental impact through energy savings and recycling.
Implementation Method 1
soaking a pyrolysis char (PC) in the cement paste to create a coated pyrolysis char (CPC)
Implementation Method 2
spraying water onto the dry mixture of the PC and the cement material to form a wet mixture
Implementation Method 3
drying the CPC
Implementation Method 4
sieving and vibrating the soaked PC to remove excess water
Data Source
AI summary
Embodiments of the present disclosure related methods of pre-coating pyrolysis char for use in pyrolysis char bricks. In one method, the method includes forming a cement paste using water and a cement material; soaking a pyrolysis char (PC) in the cement paste to create a coated pyrolysis char (CPC); and sieving the CPC and cement paste with a mesh. In another embodiment, the method includes mixing a PC with a cement material to form a dry mixture; spraying water onto the dry mixture of the PC and the cement material to form a wet mixture; stirring the wet mixture to form a CPC; and drying the CPC. In another embodiment, the method includes soaking a PC in water to form a soaked PC; sieving and vibrating the soaked PC to remove excess water, mixing a cement material with the soaked PC to create a CPC; and drying the CPC.