Blast Furnace Injection Semi-Coke Carbonization for Grindability
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Solution Overview
Problem
The challenges of using semi-coke in blast furnace injection include low grindability, fluctuating components, and the difficulty in balancing cost performance and grindability, limiting its large-scale application due to safety concerns and increased pulverizing costs, as well as the lack of a scientific evaluation method for optimal matching with pulverized coal.
Innovation Solution
A directional preparation technology for semi-coke involves systematic experiments to establish relationships between carbonization process parameters and injection performance, optimizing volatile matter and ash removal percentages, and establishing carbonization temperatures to achieve high-performance semi-coke suitable for blast furnace injection, along with a cost performance evaluation coefficient for optimal blending with low-rank coal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If semi-coke is used as raw material for blast furnace injection, then cost is reduced, but grindability deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing carbonization temperature (400-600°C) and time (0.5-2 hours) to control volatile matter content (10-25%) and particle size distribution of semi-coke. These parameter adjustments improve grindability while maintaining cost advantages, resolving the contradiction between using cheap semi-coke and achieving acceptable grinding performance.
2Adaptability or versatility
If semi-coke is used for blast furnace injection, then fuel resource scope is expanded, but safety deteriorates due to component fluctuation
Solution Approach 1:
The patent establishes specific parameter ranges for semi-coke quality control: volatile matter 10-25%, fixed carbon 70-85%, particle size 0-20mm with specific distribution. By controlling these parameters, the patent ensures safe and stable blast furnace operation while expanding fuel resource scope to include semi-coke from various coal types.
Solution Approach 2:
The patent implements feedback mechanisms through systematic experimentation and performance testing to establish relationships between semi-coke preparation parameters and injection performance. This feedback loop enables continuous optimization of semi-coke quality to maintain safety while expanding fuel versatility.
3Adaptability or versatility
If semi-coke is used for blast furnace injection, then pulverizing cost increases, but fuel flexibility improves
Solution Approach 1:
The patent applies preliminary action by pre-processing semi-coke through controlled carbonization before injection. This preliminary treatment optimizes particle size distribution and reduces volatile matter content, thereby improving grindability and reducing pulverizing costs while maintaining fuel flexibility.
4Ease of manufacture
If carbonization temperature is reduced to improve semi-coke grindability, then injection cost is reduced, but combustion performance deteriorates
Solution Approach 1:
The patent optimizes carbonization temperature within the range of 400-600°C and time of 0.5-2 hours to achieve a balance between grindability and combustion performance. This parameter optimization ensures adequate volatile matter content (10-25%) for good combustion while maintaining improved grindability compared to traditional high-temperature carbonization.
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 ensures high-performance semi-coke production with good combustibility, grindability, and safety, and optimizes the blending ratio for economic benefits, expanding fuel resources and enhancing energy efficiency and emission reduction in blast furnace iron-making.
Implementation Method 1
performing dry distillation on raw coal to remove part of volatile matters to prepare the semi-coke for blast furnace injection
Implementation Method 2
semi-coke particles and the bituminous coal or anthracite form a particle size difference, thereby accelerating the grinding effect of the semi-coke particles
Data Source
AI summary
An optimization method for a directional preparation technique and efficient use of semi-coke for blast furnace injection. Firstly, the volatile and the ash content of target semi-coke are preset, and then the volatile and the ash removal percentages of a raw coal are calculated; after ash removal, several sets of dry distillation carbonization temperatures and carbonization times are obtained according to the volatile removal percentage, and the relationships between a combustion rate, abrasiveness, explosiveness and jet flow property and the carbonization temperature are respectively established to obtain the optimal actual carbonization temperature; and semi-coke for blast furnace injection is obtained at an actual carbonization temperature. The directional preparation is suitable for the semi-coke for blast furnace injection, and an optimal coal-compounding scheme is obtained, thus achieving the efficient and safe injection of blast furnace iron-making fuels, and energy conservation and emission reduction.