Kaolin Calcination Assembly for Low-Carbon Cement Clinker
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Solution Overview
Problem
The cement industry faces significant carbon dioxide emissions from clinker calcination, accounting for 60% or more of total emissions, and high energy consumption in the production process.
Innovation Solution
A calcination system and method incorporating a kaolin calcination assembly with a preheater and decomposition furnace, utilizing an oxygen-enriched or CO reducing atmosphere, and adding activated kaolin to the cement calcination assembly to reduce clinker usage and enhance material activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If traditional clinker calcination is used to produce cement, then cement production can be achieved, but carbon dioxide emissions account for 60% or more of total emissions and energy consumption is high
Solution Approach 1:
The patent applies preliminary action by pre-calcining kaolin separately in a decomposition furnace at 700-850°C to activate it before adding it to the cement clinker. This pre-treatment transforms kaolin into activated alumina with higher reactivity, allowing it to partially replace traditional clinker and reduce CO2 emissions while maintaining cement production efficiency
Solution Approach 2:
The patent changes physical and chemical parameters by controlling the calcination temperature (700-850°C) and time (0.5-2 hours) of kaolin to transform its crystal structure. This parameter optimization activates the alumina in kaolin, enabling it to serve as an effective alternative material that reduces emissions without compromising productivity
2Object-generated harmful factors
If clinker usage amount is reduced to lower carbon emissions, then carbon footprint decreases, but cement performance and strength may be compromised
Solution Approach 1:
The patent changes the chemical state of kaolin by calcining it at 700-850°C to transform six-coordinated aluminum ions into four-coordinated activated alumina. This parameter change enhances the reactivity and binding capability of kaolin, allowing it to replace clinker while maintaining or even improving cement strength
Solution Approach 2:
The patent creates a composite material system by combining activated kaolin with traditional cement clinker. The activated alumina from kaolin forms a composite structure that enhances cohesion and durability, enabling reduced clinker content while preserving strength requirements
3Object-generated harmful factors
If kaolin is added to cement raw materials to reduce carbon emissions, then clinker production carbon footprint decreases, but additional processing equipment and steps are required
Solution Approach 1:
The patent segments the calcination process into two independent parts: a decomposition furnace for kaolin activation and the existing cement kiln for clinker production. This segmentation allows the kaolin processing to be added as a separate, modular unit without fundamentally redesigning the entire cement production system
Solution Approach 2:
The patent uses the decomposition furnace as an intermediary device that processes kaolin into activated alumina before it enters the main cement production line. This intermediary step enables the integration of emission-reducing technology while maintaining compatibility with existing cement manufacturing equipment
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
Reduces carbon emissions and energy consumption by transforming kaolin into activated alumina, increasing the specific surface area and porosity, thereby enhancing the performance and durability of cement clinker.
Implementation Method 1
a layered aluminosilicate structure in the kaolin is dehydrated and decomposed at high temperature, and further conducts structural reorganization
Implementation Method 2
Activated kaolin is generated by the decomposition furnace through calcination
Implementation Method 3
the preheater is provided with a multi-stage cyclone cylinder
Data Source
AI summary
The disclosure relates to the technical field of cement manufacturing, and specifically relates to a calcination system and method for low-carbon cement clinker. The calcination system includes: a kaolin calcination assembly including a preheater and a decomposition furnace, where the preheater is provided with a multi-stage cyclone cylinder; the preheater is provided with a feed port and a discharge port; the decomposition furnace is provided with a fuel adding port and a raw material inlet; the raw material inlet is connected to the discharge port; activated kaolin is generated by the decomposition furnace through calcination; and the decomposition furnace has a calcination temperature of 700° C. to 850° C. and calcination time of 0 h to 1.5 h, and a calcination atmosphere in the decomposition furnace is an oxygen-enriched atmosphere or a CO reducing atmosphere; and a cement calcination assembly configured to generate cement clinker through calcination, where the activated kaolin is added to a discharge side of the cement calcination assembly according to a predetermined ratio of the activated kaolin to the cement clinker. Use of carbon-containing raw materials in clinker production and carbon emissions of clinker are reduced, and a hydration rate of the cement clinker is adjusted.