Research On Test Method About The Flux In Laboratory Distillation Of Petroleum Analyzer

Laboratory distillation of petroleum analyzer is very important in the measure of oil products. It is widely used in many industries such as oil refining, chemical industry, railway etc. At present, the analyzer in our country falls behind, and it has a lot of shortcoming of manual operation and low measurement accuracy etc. With the rapid development of science and technology, it is necessary to increase automatization level of the analyzer. The measurement of distillation flux is very difficult in the automatizing procedure. Because of the characteristic of the flux to measure, the existing flux measurement is not useful. On the basis of studying and analyzing the possible measuring methods, this paper describes a new scheme using CIS (Contact Image Sensor) as imaging sensor and PIC16F877 SCM as processor considering the flux characteristic of micro flow, zero-pressure gradient flow, discontinuous flow and pipe not being full of liquid. There are advantages of high precision, simple controlling, real-time measuring and low cost in this new system. The paper proposes that transmission light carrying the image of object is gathered by CIS. With the method of geometrical optics analysis and Tracepro software, the mathematical model of light-intensity distribution on projection plane and light-intensity distributing curve is established in condition of illumination with linear light source. What's more, the imaging character of transparent glass graduate is obtained. Based on the theory analyzing, the author has completed the designing and debugging the real-time micro flow measurement system using CIS. Following circuits have been designed out: driver of CIS, processor of CIS video frequency's signal, processor of digital signal, controller. The software of acquiring data, displaying and controlling has been programmed. The system debugging and real measurement results show that circuits designed and software projected have attained expecting objective and laid a good foundation for the automatization of the analyzer. The measurement system of distillation flux based on CIS can detect micro flux accurately and fleetly. There are characteristics of good performance, simple structure, low power consumption, small dimension, and low cost in the device. The new system is expected to applied extensively on the micro flux measuring.