Reducing Gas Injection Device for Shaft Furnace
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Blast furnaces face challenges in reducing CO2 emissions and require a device for injecting reducing gas with improved durability and ease of implementation, as existing methods are prone to clogging and require new equipment installation, especially when injecting at the reduction zone level.
Innovation Solution
A device with an external casing and internal steel casing for injecting reducing gas into the shaft furnace, designed to withstand high temperatures and minimize clogging risks, featuring a gas injection outlet protected by an upper part to prevent material accumulation and comprising optional refractory layers, reinforcing plates, and adjustable injection angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If new equipment is installed for injecting reducing gas at the reduction zone level, then CO2 emissions can be reduced by reintroducing CO-rich top gases, but the device is subjected to shocks and abrasion from the burden and may be clogged by fines and volatiles matter
Solution Approach 1:
The patent introduces a protective intermediary structure (the protruding front face portion) that acts as a mediator between the burden material and the injection outlet. This intermediary element absorbs the direct impact of shocks and prevents fines and volatiles matter from directly clogging the injection outlet, thereby protecting the device while maintaining its function to reduce CO2 emissions
Solution Approach 2:
The design performs preliminary protection by positioning the front face portion to protrude into the furnace before the burden material can reach the injection outlet. This preliminary action prevents clogging and damage before they can occur, ensuring the device maintains reliability throughout its operational lifetime
2Object-generated harmful factors
If new equipment is installed for injecting reducing gas at the reduction zone level, then CO2 emissions can be reduced, but the device complexity increases due to exposure to shocks and abrasion
Solution Approach 1:
The device is segmented into distinct functional portions: the front face portion that protrudes and faces the burden, and the main body containing the injection outlet. This segmentation allows the front face to independently absorb shocks and prevent clogging, while the main body maintains the injection function, thereby reducing overall device complexity while still protecting against harsh conditions
3Productivity
If the injection outlet is exposed to the burden material, then reducing gas can be injected effectively, but the outlet is prone to clogging by fines and volatiles matter
Solution Approach 1:
The patent solves the clogging problem by transitioning from a two-dimensional outlet plane to a three-dimensional protective structure. The front face portion protrudes into the furnace space, creating a spatial dimension that shields the injection outlet. This dimensional change allows the outlet to remain exposed enough for effective gas injection while being protected from clogging by fines and volatiles matter
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 device enhances the lifetime of reducing gas injection systems by preventing clogging and facilitating easy implementation, reducing CO2 emissions by allowing for efficient reuse of CO-rich top gases, thereby lowering coke consumption and emissions.
Implementation Method 1
the internal casing is made of steel having a resistance to temperature up to 1200° C., the device does not comprise any cooling system
Implementation Method 2
a refractory layer is located between the external and the internal casings
Data Source
AI summary
A device to inject a reducing gas into a shaft furnace includes an external casing whose front face is provided with an outlet for gas injection into the shaft furnace, an internal casing located inside the external casing wherein reducing gas is circulating. The internal casing has an opening matching the gas injection outlet of the front face of the external casing. The front face of the external casing includes an upper and a lower part and the gas injection outlet is in the lower part and inwards from the upper part.