Sintering Furnace Drying Zone Temperature Control via Exhaust Gas Blower
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Solution Overview
Problem
The existing sintering furnace control systems face challenges in maintaining balance due to large changes in the control valve position, leading to variations in gas flow and product quality, especially when trying to maintain a constant drying zone temperature, which affects the entire furnace process.
Innovation Solution
A method and equipment that utilize a separate variable-speed exhaust gas blower to regulate the gas flow through the material bed in the drying zone by removing part of the circulation gas flow as an exhaust gas flow, allowing for automated temperature control without influencing the gas flow through the bed, and incorporating a by-pass gas duct and control valve to maintain consistent gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the control valve position is changed to maintain drying zone temperature, then the temperature control is improved, but the gas flow through the material bed is influenced and process balance is disturbed
Solution Approach 1:
The gas flow control is segmented into two independent pathways: a main flow through the material bed and a bypass flow for temperature control. The control valve is positioned in the bypass duct, allowing separate regulation of temperature without affecting the main gas flow through the material bed, thus resolving the contradiction between temperature control and process balance maintenance
Solution Approach 2:
The bypass gas duct acts as an intermediary pathway that allows temperature adjustment without directly interfering with the main gas flow through the material bed. By introducing this intermediate flow path, the system can regulate temperature independently while maintaining stable gas flow through the bed, eliminating the harmful interaction between temperature control and process balance
2Extent of automation
If automatic control valve adjustment is implemented, then the automation level is improved, but product quality varies due to fluctuations in gas flow and temperature
Solution Approach 1:
The system employs dynamic adjustment of the control valve position in response to temperature deviations. The control valve is positioned to regulate bypass flow dynamically, allowing smooth and precise temperature control without causing fluctuations in the main gas flow through the material bed, thereby maintaining product quality consistency while achieving automation
3Volume of stationary object
If the circulation gas duct size is reduced, then the equipment size is improved, but the gas flow capacity is limited
Solution Approach 1:
The gas flow is segmented into two separate pathways: the main flow through the material bed and the bypass flow for temperature control. This segmentation allows the circulation gas duct to be sized for the main flow only, while the bypass duct handles the additional temperature control flow, effectively reducing the required duct size without compromising overall gas flow capacity
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 solution enables precise control of the drying zone temperature, reduces the size of the blower and circulation gas duct, and improves process stability, ensuring consistent product quality and easier maintenance of furnace balance.
Implementation Method 1
gas is conducted through the conveyor base and the material bed when the material bed travels through the process zones
Implementation Method 2
a separate variable-speed exhaust gas blower to regulate the gas flow through the material bed
Implementation Method 3
conducting part of the gas flow of the circulation gas duct as a by-pass gas flow past the material bed
Implementation Method 4
a control valve that is arranged in the bypass gas duct, which when open, increases the flow and decreases the temperature
Implementation Method 5
the energy of the gas is used for heating the material bed and evaporating water
Implementation Method 6
heating the material bed and evaporating water
Implementation Method 7
The material bed is conveyed by the conveyor base through the process zones of the sintering furnace
Data Source
AI summary
The invention relates to a method and equipment for the continuous sintering of mineral material in a sintering furnace (S). In the method, a material bed (2) is formed on a conveyor base (1), the material bed (2) is conveyed by the conveyor base (1) through the process zones (I-VII) of the sintering furnace that have different temperatures, the zones including at least one drying zone (I), at least one cooling zone (VII), and at least one other process zone (II, III, IV, V, VI) between the said drying zone and cooling zone, and gas is conducted through the conveyor base and the material bed (2), when the material bed travels through the process zones (I-VII), and gas is circulated in a circulation gas duct (3) from the last cooling zone (VII) to the drying zone (I). Part of the gas flow that is conducted to the drying zone (I) in the circulation gas duct (3) is removed as an exhaust gas flow (B) by the exhaust gas blower (5) of an exhaust gas duct (4). The volume flow of the exhaust gas flow (B) is regulated by regulating the blowing power of the blower (5) to control the temperature of the gas flow travelling through the material bed in the drying zone.