Oxygen-Controlled Calciner for Stable Thermal Output
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Solution Overview
Problem
Existing thermal treatment plants, particularly calciners with reduced riser tube lengths, face challenges in maintaining consistent thermal output due to fluctuations in combustion and thermal energy, limiting their utility in industries like cement production.
Innovation Solution
A method and plant design that includes a riser conduit with a treatment region for fuel conversion, where oxygen content and temperature are continuously monitored and adjusted using open-loop/closed-loop control to maintain consistent thermal output, utilizing oxygen-rich gases and fuels like waste materials for thermal treatment of air-dispersible raw materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the riser tube length is reduced to shorten the calciner, then the device complexity and space requirements are reduced, but the thermal output becomes unstable and difficult to control
Solution Approach 1:
The patent implements a feedback control system that continuously monitors the oxygen content in the hot gas and adjusts the oxygen supply accordingly. This closed-loop control ensures stable combustion and consistent thermal output despite the reduced riser tube length, resolving the contradiction between compact structure and thermal stability.
Solution Approach 2:
The patent changes the oxygen content parameter in the hot gas by introducing oxygen-rich gas into the treatment region. This parameter adjustment allows for precise control of combustion intensity and thermal output, enabling stable operation in a compact calciner design.
2Productivity
If oxygen content in hot gas is increased to improve combustion efficiency, then the thermal treatment effectiveness is improved, but the device complexity increases due to additional oxygen supply and control systems
Solution Approach 1:
The oxygen-rich gas supply system serves multiple functions: it provides combustion oxygen, enables precise thermal output control, and allows flexible adjustment of combustion intensity. This multi-functionality justifies the added complexity by delivering multiple benefits from a single system integration.
Solution Approach 2:
The system dynamically adjusts the oxygen supply based on real-time monitoring of hot gas composition and thermal output requirements. This dynamic control allows the system to adapt to varying operational conditions, maintaining optimal efficiency while managing complexity through intelligent regulation.
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 system achieves stable thermal output and efficient thermal treatment of raw materials by adjusting oxygen and fuel introduction based on real-time measurements, enhancing the performance and versatility of calciners in cement production.
Implementation Method 1
the raw material is heated, for example in an entrained flow
Implementation Method 2
subjecting the raw material to thermal treatment by the hot gases and/or the radiant heat in the conduit
Implementation Method 3
at least partly converting the fuel in a treatment region, where the heat generated in the treatment region is supplied at least partly to the conduit
Implementation Method 4
introducing an oxygen-rich gas into the treatment region
Data Source
AI summary
The present disclosure relates to a method of thermal treatment of air-dispersible raw material, especially cement raw meal and/or mineral products, wherein the raw material is introduced into a conduit through which hot gases flow and is subjected to thermal treatment by the hot gases and/or the radiant heat in the conduit, fuel is at least partly converted in a treatment region, and the heat generated in the treatment region is supplied at least partly to the conduit, and an oxygen-rich gas is introduced into the treatment region, wherein the oxygen content in the hot gas and/or the gas temperature is ascertained and the amount of oxygen introduced into the treatment region is adjusted by open-loop or closed-loop control depending on the temperature ascertained and/or the oxygen content.