Ladle Preheater Emissive Coating and Pyrometer Control
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Solution Overview
Problem
Conventional ladle preheating methods in steelmaking consume large amounts of fuel and cause refractory damage due to overheating, leading to inefficient energy use and increased operational costs.
Innovation Solution
A method involving a preheater with a radiant reflective surface coated with a high emissivity silicide coating, coupled with pyrometer-controlled temperature regulation and a direct drive throttle valve to manage fuel flow, ensuring efficient heating and reducing overheating risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If gas-fired burners are used to preheat ladles, then the ladles can be heated to desired temperature, but large amounts of fuel are consumed and refractory damage occurs due to overheating
Solution Approach 1:
The patent implements temperature feedback control by measuring the actual temperature of the ladle refractory lining and using this information to adjust the burner output. This closed-loop control system prevents both insufficient heating and excessive fuel consumption, allowing the system to maintain optimal temperature while minimizing energy waste.
Solution Approach 2:
The patent changes the operational parameters of the burners by introducing variable speed drives and adjustable air-fuel ratios. Instead of operating at fixed high power, the burners can modulate their output based on real-time temperature conditions, enabling efficient heating across different stages of the preheating process.
2Temperature
If gas-fired burners are used to preheat ladles, then the ladles can be heated to desired temperature, but refractory damage occurs due to overheating
Solution Approach 1:
Temperature sensors continuously monitor the refractory lining temperature and feed this data back to the control system. When the target temperature is approached, the system automatically reduces burner output to prevent overheating and subsequent refractory damage, while still achieving the necessary heating.
Solution Approach 2:
The control system is designed to prevent overheating before it occurs by anticipating the temperature rise and adjusting burner output in advance. This proactive approach avoids the harmful effects of excessive heat on the refractory lining.
3Productivity
If conventional preheating methods are used, then ladles can be preheated, but the process is inefficient and energy waste occurs
Solution Approach 1:
The patent implements continuous preheating of multiple ladles in sequence, with the burners operating continuously but at variable intensity. This eliminates idle time and ensures that ladles are always at optimal temperature for charging, maximizing steelmaking capacity while minimizing energy waste through efficient heat utilization.
Solution Approach 2:
The system dynamically adjusts burner parameters including air-fuel ratio, burner speed, and position based on real-time temperature measurements and ladle position in the preheating zone. This optimization ensures maximum heat transfer efficiency at each stage of the preheating process.
Data Source
AI summary
Embodiments of the invention comprise a preheater for preheating a ladle for use in steelmaking wherein less fuel is consumed in heating the ladle efficiently and accurately to a controlled temperature. A preheater temperature is varied by controlling a burner of the heating unit based on measurements of refractories of the ladle taken by a pyrometer. The heating unit of the preheater includes an emissive coating for reducing heat loss and efficient heating during the preheating process. The heating unit of the preheater also includes valve mechanisms for accurately varying a flame size of the burner by regulating the rate of fuel, air, and oxygen supplied to the heating unit.