Pelletising Plant Combustion Arrangement for Stable Heating
Solution Overview
Problem
Existing pelletising plants face challenges in maintaining a consistent high temperature during the oxidation and sintering process of pellets, which affects the durability of the final product and results in higher NOx levels due to inefficient combustion arrangements.
Innovation Solution
A method and arrangement where a combustion arrangement is positioned outside the direct passage of the medium in the inlet, allowing for lower air volume combustion, mixing of preheated media, and continuous fuel combustion using air and gas, to achieve a stable and efficient heating process with reduced NOx emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a combustion arrangement is positioned inside the direct passage of the medium in the inlet, then heating efficiency is improved, but NOx levels increase and temperature consistency deteriorates
Solution Approach 1:
The combustion arrangement is extracted from the direct passage of the medium and positioned outside it. This separation allows the combustion to occur in a dedicated region while the medium flows through a separate path, enabling efficient heat transfer without direct contact between the combustion zone and the medium passage, thereby reducing NOx formation while maintaining heating efficiency.
Solution Approach 2:
The inlet structure acts as an intermediary between the combustion arrangement and the medium passage. It facilitates heat transfer from the combustion zone to the medium while preventing direct mixing of combustion gases with the medium flow, thus achieving efficient heating with reduced harmful emissions.
2Power
If air volume for combustion is increased, then combustion intensity is improved, but temperature consistency deteriorates and NOx levels increase
Solution Approach 1:
The combustion process is localized in a specific region outside the medium passage, allowing precise control of air volume and fuel mixing ratios in that local zone. This localized combustion with optimized air supply achieves high combustion intensity while maintaining stable and consistent temperature distribution in the medium.
3Object-generated harmful factors
If combustion arrangement is positioned outside the direct passage of the medium, then NOx levels are reduced and temperature consistency is improved, but heating efficiency may deteriorate
Solution Approach 1:
The medium is preheated as it passes through the inlet structure before entering the main processing compartment. The combustion arrangement positioned outside the passage provides preliminary heating to the medium, ensuring that the medium enters the compartment at an optimized temperature, thus maintaining overall heating efficiency while reducing NOx emissions.
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 ensures a consistent high temperature for pellet oxidation and sintering, improving pellet durability and reducing NOx levels in the exhaust, while maintaining a stable and efficient heating process.
Implementation Method 1
The combustion arrangement comprises fuel that, when the arrangement is in use, is ignited and combusted. Combustion heat is developed during the combustion of the fuel, which heat is transferred to the medium that is present at the combustion arrangement in the inlet
Implementation Method 2
Combustion heat is developed during the combustion of the fuel, which heat is transferred to the medium that is present at the combustion arrangement in the inlet and that passes through the inlet on its way to the compartment
Implementation Method 3
pellets are arranged to be oxidised and sintered with the aid of the hot medium
Implementation Method 4
pellets are arranged to be oxidised and sintered with the aid of the hot medium
Data Source
AI summary
A method includes the introduction of a first medium into the compartment through an inlet and the heating of the first medium when it is present in the inlet. The heating takes place through the use of a combustion arrangement that is arranged in the inlet and that comprises fuel. The heating, the use of the combustion arrangement, includes in turn the ignition of the fuel, combustion of the fuel, and the transfer of the combustion heat to the first medium that is present at the combustion arrangement in the inlet. The combustion arrangement, is arranged in a region in the inlet, which in turn is arranged outside of the direct passage of the first medium in and through the inlet, such that the ignition of the fuel, the combustion of the fuel and the transfer of combustion heat to the first medium take place in this region.