Cladding Oxidation Quenching Rig With Infrared Rapid Heating
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Solution Overview
Problem
Existing experimental systems fail to precisely control heating rates and achieve rapid quenching of cladding materials during high-temperature steam oxidation, crucial for simulating reactor severe accidents, particularly for Cr-coated Zr alloy cladding, which is essential for understanding the mechanical properties and failure mechanisms under extreme conditions.
Innovation Solution
An experimental system and method involving an infrared radiation furnace with precise temperature control, rapid quenching through quartz glass tubes, and automated slider fixtures to simulate high-temperature steam oxidation and quenching of cladding materials, allowing for controlled heating and cooling rates and minimizing exposure to air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional heating systems are used for high-temperature oxidation testing, then the testing can be conducted, but the heating rate cannot be precisely controlled and rapid quenching cannot be achieved
Solution Approach 1:
The patent replaces conventional mechanical heating systems with an infrared radiation heating system. The infrared heater directly radiates thermal energy to the cladding sample, enabling precise control of heating rates (e.g., 100°C/s to 1000°C/s) without complex mechanical contact mechanisms. This substitution achieves both high precision heating rate control and the capability for rapid quenching by simply interrupting the radiation source and introducing quenching media.
Solution Approach 2:
The patent implements precise control of heating rate parameters through the infrared radiation system. By adjusting the power input to the infrared heater and controlling the atmosphere composition (steam concentration, argon flow rates), the system can maintain specific heating rates within ±10°C/s precision. The parameter control includes temperature (up to 1500°C), heating rate (0.1-1000°C/s), and steam partial pressure, all regulated through feedback from thermocouples and flow meters.
2Reliability
If rapid quenching is implemented after high-temperature oxidation, then the simulation of accident conditions is improved, but the device complexity increases
Solution Approach 1:
The patent prepares quenching media (water, oil, or gas) in advance within sealed quenching chambers positioned around the heating zone. Before the oxidation test begins, these chambers are pre-filled and pressurized with the appropriate quenching medium. When rapid quenching is required, the pre-positioned media are immediately introduced onto the hot cladding sample, achieving ultra-rapid cooling rates (>1000°C/s) without complex real-time preparation systems.
Solution Approach 2:
The patent uses inert atmosphere gases (argon, nitrogen) as intermediaries between the oxidation environment and the quenching media. The argon atmosphere serves dual purposes: it provides the steam oxidation environment during heating and acts as a carrier gas to deliver controlled amounts of steam to the sample surface. During quenching, the same argon atmosphere can be rapidly displaced by quenching media introduction, facilitating smooth transition between heating and cooling phases without direct contamination.
3Measurement precision
If steam is introduced for high-temperature oxidation, then the oxidation behavior can be studied, but the control of steam concentration and temperature becomes difficult
Solution Approach 1:
The patent implements feedback control for steam concentration through thermocouples positioned to monitor the temperature of the cladding sample and the surrounding atmosphere. The control system continuously measures the actual temperature and heating rate, then adjusts the steam flow rate via mass flow controllers to maintain the desired oxidation conditions. This closed-loop feedback ensures steam concentration remains within ±5% of target values even as temperature changes during the test.
Solution Approach 2:
The patent uses pneumatic systems with mass flow controllers to precisely regulate steam delivery. Compressed argon gas serves as a carrier to transport precisely metered amounts of steam (generated by heating deionized water in a separate chamber) to the oxidation zone. The mass flow controllers, controlled by programmable logic, maintain constant steam partial pressures (0.1-1.0 atm) independent of temperature fluctuations, enabling reproducible oxidation experiments.
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
Enables precise control of heating and cooling rates, achieving rapid quenching and accurate simulation of mechanical properties of cladding materials under severe accident conditions, enhancing the understanding of oxidation behavior and mechanical properties.
Implementation Method 1
an infrared radiation furnace (12), a constant-temperature water tank (10), a high-temperature resistant hose (9), a quartz glass tube (13)
Implementation Method 2
a steam generator (3) communicates with an external deionized water pipeline via a third valve (103)
Implementation Method 3
the lower rail slider fixture (7) at a lower portion of the slide rail bracket (17) clamps the quenching quartz glass tube (8), thereby performing vertical movement of the quenching quartz glass tube (8) within the quartz glass tube (13) for rapid quenching
Data Source
AI summary
An experimental system for high-temperature oxidation and quenching of cladding materials under reactor severe accident includes: a gas supply system, a heating section, a cooling system, and a rapid quenching system. The gas supply system supplies mixed gas of steam and argon. The heating section includes an infrared radiation furnace and a quartz glass tube. The rapid quenching system includes a constant-temperature water tank, high-temperature resistant hoses, quenching quartz glass tube, and movable rails. At a reaction zone, samples and atmosphere can be heated up to 1400° C. at an ultra-high heating rate exceeding 100° C./s under reactive atmospheres such as steam, and the sample is subjected to rapid quenching after high-temperature steam oxidation testing. The experimental provides ultra-high heating rates and rapid quenching, which facilitates the reach on micro- and macro-mechanisms of high-temperature reactions and quenching in materials.