Study On Heat System Control Of M-Model Coke Oven Based On Orifice Optimisation Shanghai Jiao Tong University

Coke is the fundamental material of melting and it acts as heat-generating, reducing agent and the framework of stock column, the quality of the coke affects the main technological and economic indicators and enterprise revenue a lot. It should be mentioned that the quality of the coke is not only linked to the condition of the coal property, but also to the coking technology which has an impact on both the quality and energy consumption.As coking involves complex processes such as heat transmission, chemical reaction change and heat release, in addition, it has a very complicated structure of the oven body, a very severe operating environment, various random disturbance factors, etc., all these make the control of the coking oven much more difficult than other kinds of industrial ovens. The most important problem of coking is to control the oven in which the key is to balance the temperatures between the flame paths and save the gas. The temperature of the flame path is related to to the quality of the coke and coking time, but in reality, as the structure of the oven, coking heat source and the fuel burning is so complex, the control of oven temperature is mostly done by experience or by using the average value of the whole ovens (as a reference), which lacks strict scientific evidences. Therefore, from 1970s many developed countries began to develop mathematical model and control strategy of the oven, and some of the result has been already applied into the production and significant effect obtained. But this kind of study is still at the preliminary stage in China, so it is very urgent to carry on study on this issue deeply. High temperature coking started in 16th century and it was for iron making. It is the most matured and widely used method, and it develops with metallurgy and chemical industries. In this paper, an orifice optimization model is built to balance the straight temperature between the flame paths, and to achieve the purpose of decreasing the temperature in vertical direction and the pressure of the observation port, to save the energy, to ensure the quality of the coke and to improve the economic revenue.In this paper, systematic analysis and theoretical research is combined with actual production to optimize the orifice diameter of the flame paths, and an optimization model is built based on current orifice adjustment by experience, meanwhile the optimum arrangement strategy is investigated according to this model regarding the actual industrial tests. Furthermore, control strategy and program for other cokes are given in this paper.