Method of controlling oxygen air-flowing environment in heating furnace
A control method and heating furnace technology, applied in heat treatment furnaces, furnaces, furnace types, etc., can solve the problems of hysteresis, simultaneous existence, and inability to accurately control the air volume, so as to improve control hysteresis, increase transparency and controllability, The effect of improving control efficiency
Active Publication Date: 2012-04-18
WUHAN IRON & STEEL ENG TECH GROUP
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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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[0024] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0025] This method mainly includes the following four steps:
[0026] see figure 1 with image 3 Shown:
[0027] Step 101: First, according to the process characteristics of each section of the heating furnace 11, the target curve of oxygen control in the furnace, and the excess air rate of each section, a control model 1 for residual oxygen in the furnace is established.
[0028] Simultaneously, an oxygen analyzer 4 is installed in each furnace section such as the preheating section, heating section and soaking section of the heating furnace 11 to sample the atmosphere in the heating furnace 11 and detect the residual oxygen content therein.
[0029] The control system calculates the oxygen amount deviation e(t) according to the re...
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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 fuelamount 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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IPC IPC(8): C21D1/76C21D9/70
Inventor 田宏焘陶茂钢郭伟王文菖赵利洪
Owner WUHAN IRON & STEEL ENG TECH GROUP