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Modeling of liquid level and Bubble Behavior in Vacuum Chamber of RH Process

Journal of Iron and Steel Research International 2016年第4期23卷 305-313页

作者： Yi-hong LI Yan-ping BAO Rui WANG Min WANG Qing-xue HUANG Yu-gui LI Shanxi Provincal Key Laboratory of Metallurgical Device Design Theory and Technology School of Materials Science and EngineeringTaiyuan University of Science and Technology State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

In the Ruhrstahl-Heraeus （RH） refining process, liquid steel flow pattern in a ladle is controlled by the fluid flow behavior in the vacuum chamber. Potassium chloride solution and NaOH solution saturated with CO2 were respectively used as a tracer to investigate the liquid and gas flow behaviors in the vacuum chamber. Principal compo nent and comparative analysis were made to show the factors controlling mixing and circulation flow rate. The liquid level and bubble behavior in the vacuum chamber greatly affect fluid flow in RH process. Experiments were performed to investigate the effects of liquid steel level, gas flow rate, bubble residence time, and gas injection mode on mixing, decarburization, and void fraction. The results indicate that the mixing process can be divided into three regions： the flow rate affected zone, the concentration gradient-affected zone, and their combination. The liquid steel level in the vacuum chamber of 300 mm is a critical point in the decarburization transition. For liquid level lower than 300 mm, liquid steel circulation controls decarburization, while for liquid level higher than 300mm, bubble behavior is the main controlling factor. During the RH process, it is recommended to use the concentrated bubble injection mode for low gas flow rates and the uniform bubble injection mode for high gas flow rates.

关键词： RH process liquid level vacuum chamber bubble behavior bubble residence time gas injection mode

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Design of Laser Radar Fiber Optic liquid level Sensor System

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Semiconductor Photonics and Technology 1998年第4期4卷 248-252页

作者： QIBing QIFei 等 Dept.ofComputer TsinghuaUniversityBeijing100084CHN Dept.ofPhysics DalianUniversityDalian116001CHN

A novel fiber optic liquid level sensor based on laser radar (ladar) is reported here. Using the perfect technique of ladar in which the phase of amplitude modulated light wave reflected from the liquid surface is compared with that of original modulation signal, the distance can be measured precisely. A special symmetric compensating coaxial optical system is proposed to eliminate many adverse effects. It realized the one-time electronic-free optical measurement on a simulated oil tank and achieves an accuracy of 0.3%, within a temperature range of -10 ℃～+40 ℃ over a measuring of 0～10 m.

关键词： Fiber Optic Sensor Laser Radar liquid level

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Non-Contact Ultrasonic Quality Measurements of Food Products

Non-Contact Ultrasonic Quality Measurements of Food Products

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国际农业工程大会

作者： Tat Hean Gan Prakash Pallav David A.Hutchins School of Engineering University of Warwick Gibbet Hill Road Coventry CV4 7AL UK. School of Engineering University of Warwick Gibbet Hill Road Coventry CV4 7AL UK. School of Engineering University of Warwick Gibbet Hill Road Coventry CV4 7AL UK.

＜正＞ There is growing pressure within the food industry to improve food quality measurements, particularly within packaged food products. This inspection may include looking for physical changes occurring with time, non-uniformity of the product, or the presence of foreign body contamination. The need for reliable inspection is becoming increasingly critical due to the continued automation within the industry and the shift in consumer choice towards more prepared foods.

关键词： Non-contact ultrasonic imaging agglomeration temperature measurement liquid level foreign body imaging and physiochemical change.

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Measuring Halon level Based on the Model of Residual Ultrasonic Waves in Container's Wall

Measuring Halon Level Based on the Model of Residual Ultraso...

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2012年计算机应用与系统建模国际会议

作者： Tian Yiyang Qiu Jinshui Liu Boyun College of Naval Architecture and Power Naval Univ. of Engineering

The halon is usually stored in the sealed high-pressure steel containers at liquid state, which can not be detected the liquid level by using the traditional contact-type method. In this paper ultrasonic is used to measure the liquid level which achieved the purpose of nondestructive testing, the model of residual ultrasonic waves in the container’s wall was used to determine the liquid level. We choose the wavelet threshold denoising in the wavelet transform to remove the noise in the sampling signals, by comparing the envelope area in two different states that the transducer below or on the actual liquid level to judge the results. It has been proved after repeated tests that this method operates simply, and has a more accurate conclusion.

关键词： halon the residual ultrasonic waves liquid level wavelet denoising

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