Fiber-Reinforced Coal Cake for Binder-Free Strength in Coke Ovens
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Solution Overview
Problem
Existing methods using adhesive binders to strengthen coal cakes in stamp charge coke ovens result in equipment contamination, requiring frequent cleaning and reducing productivity, while achieving high-strength coal cakes with low moisture content remains a challenge.
Innovation Solution
Mixing synthetic or plant-based fibers with lengths between 1.0 mm and 200 mm and a length-to-diameter ratio of 10 or more with coal cake raw materials to form a network, enhancing coal cake strength without using adhesive binders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive binders are used to strengthen coal cakes, then coal cake strength is improved, but equipment contamination increases requiring frequent cleaning
Solution Approach 1:
The patent removes adhesive binders from the coal cake formulation entirely, replacing them with fibers that provide strengthening functionality without the harmful adhesive properties. This extraction of the problematic substance (adhesive binder) eliminates equipment contamination while maintaining coal cake strength through alternative mechanisms (fiber network formation).
Solution Approach 2:
The patent employs fibers as a temporary, non-adhesive reinforcing element that serves its strengthening function during coal cake formation and coking, then is consumed or transformed in the high-temperature coking process without requiring subsequent cleaning or maintenance of equipment.
2Strength
If moisture content of coal is increased to improve coal cake strength, then coal cake strength is improved, but dry distillation time increases reducing productivity
Solution Approach 1:
The patent changes the strengthening mechanism from moisture-dependent (hydrogen bonding in wet coal) to fiber-network-dependent (mechanical interlocking). This parameter change allows coal cakes to achieve sufficient strength at lower moisture contents, thereby reducing the time required for dry distillation while maintaining structural integrity during charging and coking.
3Object-generated harmful factors
If fibers are used as binder instead of adhesive, then equipment contamination is reduced, but mixing complexity increases
Solution Approach 1:
The patent applies fibers locally at specific stages of coal cake formation where reinforcement is needed (during stamping and charging), rather than using adhesive binders throughout the entire process. The fibers are incorporated into the coal material in a targeted manner, providing local reinforcement without requiring complex mixing equipment or processes.
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
Produces high-strength coal cakes that prevent collapse during charging, ensuring stable coke oven operation and maintaining low moisture content, thereby improving productivity.
Implementation Method 1
Mixing synthetic or plant-based fibers with lengths between 1.0 mm and 200 mm and a length-to-diameter ratio of 10 or more with coal cake raw materials to form a network
Data Source
AI summary
Provided is a method for producing a coal cake that can improve the strength of the coal cake without using an adhesive binder. The method for producing a coal cake of the present disclosure is a method for producing a coal cake in a stamp charge coke oven, the method comprising: blending and mixing fibers having a length of 1.0 mm or more and 200 mm or less and a length-to-diameter ratio of 10 or more with a powdered raw material for coal cake, and stamping a resulting fiber-mixed raw material to obtain a coal cake.