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Title: Cross-correlation flow measurement of high temperature dust laden gases
Author: Webb, Peter J.
Awarding Body: The University of Bradford
Current Institution: University of Bradford
Date of Award: 1979
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The subject of this thesis concerns the development of a non-contact instrument for measuring the flow of gaseous effluent from 1.ron and steelmaking vessels. This effluent is a high temperature, dust laden gas and existing techniques for its flow measurement are reviewed and shown to be inade qua te • Following a study of alternative techniques it is concluded that a time of flight measurement, obtained by the cross-correlation of signals observed by infra-red detectors, is the most propitious method. In Chapter 2 preliminary investigations are presented which established the feasibility of this technique for measuring both regional and mean velocities. The results demonstrated that to ensure the signals observed are a true representation of the flow noise, careful consideration must be given to the optical properties of the fume and the characteristics of the infra-red sensors employed. In Chapter 3 the optical properties of the exhaust fume and the characteristics of infra-red sensors are examined. This information is used in the design of the prototype transducer employed throughout the rest of the development work. Circuit diagrams for several signal conditioning units are also presented, together with a brief description of their function.The experimental results obtained are presented in Chapter 4. Correlation flows measured under production plant conditions are shown to be in close agreement with results obtained uS1ng other flow measurement techniques. These results gave the confidence to construct an experimental flame tube in order to explore further development under controlled conditions. Two experiments, conducted on the experimental flame tube are described. These were designed to determine: i) The effect of varying the transducer angular field of view along the direction of flow on the correlation bandwidth. ii) The transducer spacing which gives the best accuracy. The application and performance of the flowmeter on two production plant investigations is the subject of Chapter 5. The first of these investigations is concerned with the performance of the conditioning tower and dry electrostatic precipitator of an arc furnace extraction plant. The second study 1S concerned with establishing the design parameters for future arc furnace direct extraction systems. The final Chapter contains the conclusions of the work and summarises the way in which an infrared cross-correlation flow measurement system can be designed using the information in this thesis. In addition, areas in which the research and development might continue are suggested.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available