Semi-Coke Carbonization and Blending for Blast Furnace Injection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenges of using semi-coke in blast furnace injection include low grindability, fluctuating components, and the need for a suitable matching proportion with pulverized coal, which limits its large-scale application due to safety concerns and increased costs.
Innovation Solution
A directional preparation technology for semi-coke involves ash and volatile matter removal based on content analysis, establishing relationships between carbonization parameters and performance indices, and optimizing the blending ratio with low-rank coal using cost performance evaluation coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If semi-coke is used as a raw material for blast furnace injection, then the cost of fuel is reduced and fuel resources are expanded, but the grindability is low and safety risks increase
Solution Approach 1:
The patent applies preliminary action by conducting ash removal and volatile matter removal treatments on semi-coke before it enters the blast furnace injection process. This pre-treatment removes harmful components that would otherwise cause safety issues during pulverizing and injection, while preserving the cost advantages of using semi-coke as a fuel resource.
Solution Approach 2:
The patent changes the chemical composition parameters of semi-coke by controlling the removal of ash and volatile matters to specific ranges (ash content 5-15%, volatile matter content 10-25%). This parameter optimization improves grindability and safety while maintaining the economic benefits of semi-coke utilization.
2Productivity
If semi-coke is ground to improve injection performance, then the injection efficiency increases, but the pulverizing cost significantly increases
Solution Approach 1:
The patent applies preliminary action by performing ash removal and volatile matter removal on semi-coke before pulverization. This pre-treatment improves the grindability of semi-coke, reducing the energy and cost required for subsequent pulverizing operations while maintaining high injection efficiency.
3Quantity of substance
If the proportion of semi-coke to bituminous coal or anthracite is increased to improve cost performance, then the fuel cost decreases, but the grindability decreases
Solution Approach 1:
The patent changes the composition parameters of the mixed fuel by optimizing the proportion of semi-coke (30-70% by mass) and controlling the ash and volatile matter content. This allows achieving both good cost performance and acceptable grindability through parameter optimization rather than simply increasing semi-coke proportion.
Solution Approach 2:
The patent creates a composite fuel material by mixing semi-coke with bituminous coal or anthracite in optimized proportions. This composite structure combines the cost advantages of semi-coke with the grindability benefits of traditional coal, achieving a balance between cost performance and manufacturing ease.
4Ease of manufacture
If lower carbonization temperature is used to improve grindability of semi-coke, then the grinding becomes easier, but the combustion performance and reactivity may be affected
Solution Approach 1:
The patent optimizes the carbonization temperature parameter within a specific range (400-600°C) to achieve a balance between grindability and combustion performance. This parameter optimization ensures that semi-coke is easy enough to grind while maintaining sufficient combustion characteristics for blast furnace injection.
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
This approach produces high-performance semi-coke suitable for blast furnace injection with improved grindability, safety, and cost-effectiveness, expanding fuel resources and reducing energy consumption and emissions.
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
performing dry distillation on the raw coal treated in step S12 to remove part of volatile matters
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.