Method of controlling oxygen air-flowing environment in heating furnace

Abstract

The invention discloses a method of controlling oxygen air-flowing environment in a heating furnace, which belongs to the field of metal smelting. the method comprises the steps of: computing waste oxygen errors and micro components to time according to a waste oxygen target value and actual waste oxygen of each segment in the heating furnace, outputting the waste oxygen errors and the micro components to time to a waste oxygen fuzzy controller; computing an air overflow rate compensating value of each segment according to output control amount to participate in the adjustment of air and fuel amount in each burning loop; and computing the air and fuel amount required to be added in each segment in the heating furnace according to the differences between the set air and fuel flow and the actual air and fuel flow. The invention has the advantages of obviously reducing control lag caused by the lag of oxygen detection, making technical personnel accurately know characteristics of the air-flowing environment in each segment in the heating furnace in real time as well as improving the control efficiency, and increasing the transparency and the controllability of the technique process of the heating furnace.

Description

technical field [0001] The invention relates to a method for controlling the oxygen content of gas in a heating furnace, in particular to a method for controlling the oxygen content atmosphere field in the heating furnace. Background technique [0002] Billets are heated at different temperature sections in the high-temperature heating furnace. In addition to making the heated billets achieve uniform temperature distribution according to the process requirements, it is also very important to reasonably control the ratio of air and fuel during the heating process. [0003] The amount of air involved in combustion is usually described by the excess air coefficient μ. μ is the ratio of the actual air volume to the theoretical air volume. In the actual production process, the value of μ is related to factors such as fuel type, combustion device form and combustion conditions. According to the excess oxygen content in the combustion products, it can be divided into strong oxidi...

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Problems solved by technology

However, this method cannot accurately control the amount of air involved in the combustion of each furnace section, which may cause the simultaneous existence of over-oxygen combustion and under-oxygen combustion in different furnace sections in the furnace.

In addition, there is a large hysteresis in this kind of oxygen detection; at the same time, the conventional control method also has a large time lag, and it is impossible to adjust the amount of air added in each section of the heating furnace in time.

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