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The overall structure of the hot stove combustion intelligent control system
Hot stove is a complex controlled object with essential nonlinearity, large delay and slow time-varying characteristics. Its characteristics are constantly changing with the change of combustion working environment. It is very difficult to accurately grasp the operating status of hot stoves [Sichuan. Moreover, since the combustion effect of the hot stove (that is, the amount of stored heat) is difficult to measure and evaluate directly, the existing combustion control methods are based on the hot stove temperature of the dome and the exhaust gas temperature as indirect control indexes .
The ideal curve of the combustion process of the hot blast stove, which is reflected by the vault temperature and the exhaust gas temperature, is shown in Figure 5-1. It can be divided into two stages: rapid heating and thermal storage. Hot stove combustion control generally take the following approach: In the heating period with a larger amount of gas and the appropriate air-fuel ratio (air and fuel gas flow ratio) for rapid heating, so that hot blast stove arch temperature quickly reached a stable value; Into the heat storage period, the need to increase the amount of air to maintain the vault temperature, and exhaust gas temperature management period, adjust the gas and air flow to ensure that the exhaust temperature does not exceed its set pressure study.
In addition, due to the need for multiple stoves to work together to achieve the task of providing continuous hot air to Shanghai, the research and development of automatic control systems should also consider the coordination and control problems between them.
This chapter first discusses the selection of hot blast stove combustion system from the perspective of energy-saving combustion. Then, according to the combustion control problem of single hot-blast stove, the staged control strategy based on the characteristics of hot blast stove process is introduced. The hot blast stove combustion control The basic idea and control model are introduced and the composition and network system of control system are introduced. Finally, the characteristics of sequencing batch operation of hot-blast stove are analyzed. Based on this characteristic, a coordinated control model for hot-blast stove system is proposed.
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