Pot Furnace Cooling Jacket and Flame Path Design
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Solution Overview
Problem
The use of high-sulfur petroleum coke in pot furnaces leads to reduced service life due to sulfur-induced corrosion and increased SO2 emissions, complicating flue gas desulfurization and increasing production costs.
Innovation Solution
A pot furnace design with a cooling water jacket and an eight-layer flame path that uses cold air for combustion, reducing calcination temperatures and sulfur dioxide content in flue gas, thereby slowing down silicon brick corrosion and extending furnace life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-temperature calcination (1250-1350°C) is used in pot furnaces, then calcined coke quality and yield are improved, but sulfur corrosion of silicon bricks increases and service life decreases
Solution Approach 1:
The flame path is divided into eight distinct temperature zones, with temperatures ranging from 1000-1200°C in the first layer to 900-1100°C in the eighth layer. This segmentation allows different parts of the calcination process to occur at different temperatures, maintaining quality in higher zones while reducing corrosion in lower zones where silicon bricks are exposed.
Solution Approach 2:
The patent changes the temperature parameter from the conventional single high-temperature zone (1250-1350°C) to a multi-layer temperature gradient system. By controlling the temperature at each layer and maintaining exhaust smoke temperature below 1000°C, the system achieves both quality maintenance and corrosion reduction through parameter optimization.
2Manufacturing precision
If high-temperature calcination is used, then calcined coke quality is improved, but SO2 emissions increase and desulfurization difficulty increases
Solution Approach 1:
The eight-layer flame path structure segments the combustion process into temperature zones, with the lower layers (seventh and eighth) operating at 900-1100°C and the upper layers at higher temperatures. This segmentation ensures that sulfur combustion is controlled and distributed, reducing peak SO2 generation while maintaining calcination effectiveness.
Solution Approach 2:
By changing the temperature parameter distribution from a single high-temperature zone to a gradient system with exhaust below 1000°C, the patent reduces the intensity of sulfur oxidation. This parameter change lowers SO2 emissions while still achieving the required calcined coke quality through the cumulative effect of prolonged exposure to moderate temperatures.
3Object-affected harmful factors
If cold air is used for combustion instead of preheated air, then flame path temperature is reduced and corrosion is slowed, but combustion efficiency may decrease
Solution Approach 1:
The cold air intake is segmented and distributed across the eight-layer flame path structure. Each layer receives controlled amounts of cold air, creating a temperature gradient that progressively heats the air while maintaining lower overall temperatures. This segmentation allows efficient combustion to occur through the cumulative heating effect rather than requiring high-temperature preheating.
Solution Approach 2:
The system uses the flue gas from upper layers to naturally preheat the cold air entering lower layers through the eight-layer structure. This self-service mechanism provides gradual preheating without external energy input, maintaining combustion efficiency while keeping the overall flame path temperature low enough to reduce corrosion.
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 design effectively reduces sulfur dioxide emissions and prolongs the service life of the furnace by maintaining calcined coke quality while using low-cost, high-sulfur coke, and simplifies flue gas purification.
Implementation Method 1
a cooling water jacket and a flame path below the pot
Implementation Method 2
the petroleum coke is heated indirectly by high temperature gas
Implementation Method 3
the petroleum coke is heated indirectly by high temperature gas
Implementation Method 4
Sulfur which precipitates during high temperature calcination enters the flue gas and generates SO2
Data Source
AI summary
A pot furnace for calcining petroleum coke at low temperature may include a pot, and a cooling water jacket and a flame path below the pot. The flame path may include eight layers. An inlet of a first flame path layer may be in communication with a volatile channel in the front wall, and is provided with a first flame path layer flashboard An eighth flame path layer may be in communication with a communication flue. Flue gas may be discharged out of the furnace body through a main flue. A furnace bottom cooling channel may be provided below the eighth flame path layer.