Furnace Partition Combustion Characterization via Fuel Cutoff
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Solution Overview
Problem
Rotating fire chamber furnaces for baking carbonaceous blocks, such as anodes and cathodes for aluminum production, face inefficiencies in fuel consumption and risk of incomplete combustion, leading to high operating costs and potential safety hazards due to unburnt matter deposits.
Innovation Solution
A method for characterizing combustion in the lines of partitions by analyzing the content of unburned matter in combustion gases and residual air, using a test of total fuel injection shutdown to identify incomplete combustion, and adjusting stoichiometric ratios to optimize combustion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fuel injection is increased to ensure complete combustion, then combustion efficiency improves, but fuel consumption and operating costs increase
Solution Approach 1:
The furnace is divided into multiple independent lines of partitions (at least two lines), each capable of independent fuel injection control. This segmentation allows selective optimization of combustion in each line based on actual combustion quality, rather than uniformly increasing fuel across all lines, thus improving combustion completeness while controlling overall fuel consumption.
Solution Approach 2:
A feedback mechanism is implemented using a detector (such as a CO detector) to monitor combustion quality in real-time, with the detector positioned to sense combustion products from the partitions. The system adjusts fuel injection rates based on detected combustion quality, increasing fuel only when incomplete combustion is detected and reducing fuel when combustion is complete, thereby resolving the contradiction between combustion reliability and energy consumption.
2Use of energy by moving object
If fuel injection is reduced to lower operating costs, then energy consumption decreases, but incomplete combustion occurs leading to unburnt matter deposits
Solution Approach 1:
The feedback control system continuously monitors combustion quality using detectors positioned to sense combustion products. When incomplete combustion is detected (indicating potential unburnt matter formation), the system automatically increases fuel injection to restore complete combustion. This prevents harmful deposits while optimizing fuel consumption, avoiding both excessive fuel use and incomplete combustion scenarios.
Solution Approach 2:
The fuel injection system is made dynamic and adjustable, with fuel injection rates being modified in real-time based on actual combustion conditions. This dynamic control allows the system to adapt to varying combustion quality, preventing unburnt matter deposits by increasing fuel only when necessary rather than maintaining static high fuel injection levels.
3Reliability
If combustion is optimized in all lines of partitions simultaneously, then combustion efficiency improves, but system complexity and control difficulty increase
Solution Approach 1:
The control system is segmented to operate on a line-by-line basis rather than controlling all partitions simultaneously. Each line of partitions can be tested and optimized independently through sequential procedures, reducing the complexity of simultaneous multi-line control while still achieving overall combustion optimization across the entire furnace system.
Solution Approach 2:
The optimization procedure is implemented periodically and sequentially for each line of partitions rather than attempting simultaneous optimization of all lines. The system tests and adjusts one line at a time, then proceeds to the next line, which simplifies control logic and reduces system complexity while achieving comprehensive combustion optimization through repeated periodic adjustments.
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 method reduces operating costs, prevents combustion inefficiencies, and minimizes the risk of incomplete combustion by identifying and optimizing combustion in specific lines of partitions, ensuring complete combustion and reducing the risk of unburnt matter accumulation.
Implementation Method 1
analyzing the value of at least one image parameter of the overall content of unburned matter, such as carbon monoxide (CO), in the combustion gases
Implementation Method 2
The characterization of the combustion is based on the calculation of the variation between the measurements of said image parameter taken before and after the total stoppage of injection
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a method including a series of tests consisting of totally stopping the injection of fuel, one line of partitions (6) after the other, without any activity on the lines of partitions (6) other than that of the test, calculating the variation between the measurements of an image parameter of the total content of unburnt material in the combustion gases before and after totally stopping the injection in each tested line of partitions (6), and identifying any line of partitions (6) as having incomplete combustion if said variation is greater than x% of the initial value of said image parameter at the start of the corresponding test, x% preferably being between 5% and 10%.