Asymmetric characteristic dynamic control method of blast furnace hot blast stove and waste gas pipe network of blast furnace hot blast stove

Abstract

The invention discloses an asymmetric characteristic dynamic control method of a blast furnace hot blast stove and a waste gas pipe network of the blast furnace hot blast stove, and belongs to the blast furnace hot blast stove control technology. According to the operating conditions and physical characteristics of the blast furnace hot blast stove and the waste gas pipe network of the blast furnace hot blast stove, an asymmetric system theory of the blast furnace hot blast stove and the waste gas pipe network of the blast furnace hot blast stove is established, the dynamic control method based on the asymmetric system theory of the blast furnace hot blast stove and the waste gas pipe network of the blast furnace hot blast stove is developed, the argon content, the oxygen content and the CO content in flue waste gas are detected through flue gas analysis, a mathematical model is calculated according to the external air inlet amount, the external air inlet amount of the hot blast stoveis calculated, the opening degree of an inlet valve of an induced draft fan is adjusted, and the external air inlet amount is controlled within a set value range; an excess air coefficient is calculated according to an excess air coefficient calculation mathematical model, the opening degree of an air adjusting valve is adjusted by using a difference value between the calculated value and a set value, so that the excess air coefficient is kept in a set value range; and the multiple energy-saving and emission-reducing effects of improving the combustion efficiency, reducing the NOx pollution emission and achieving full-automatic control are achieved.

Description

technical field [0001] The invention belongs to the blast furnace hot blast stove control technology, specifically the external air intake control technology and the air excess coefficient control technology of the blast furnace hot blast stove, and does not include the hot blast stove air supply system control technology; the invention does not involve control systems, control equipment and instruments selection. Background technique [0002] In the blast furnace production process, the most popular new blast furnace oxygen-coal enhanced ironmaking process is particularly dependent on the high blast temperature of the hot blast furnace. However, the average air temperature of blast furnace hot blast stoves in my country is generally at a low level, and the consumption of blast furnace gas per ton of iron is also at a low level. Therefore, it is of great practical significance to carry out research on combustion optimization control technology of blast furnace hot blast sto...

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Problems solved by technology

[0014] The purpose of the present invention is to seek to break through the technical bottleneck that restricts the prior art according to the characteristics of the operating conditions of the blast furnace hot blast stove and its exhaust gas pipe network, and to research and develop a blast furnace hot blast stove that is compatible with the operating conditions of the blast furnace hot blast stove and its exhaust gas pipe network And its exhaust gas pipe network asymmetric system theory and its dynamic control method, in order to achieve deep energy saving and emission reduction of blast furnace hot blast stove; specifically, to solve the problem of increasing the air temperature of hot blast stove, reducing the temperature of exhaust gas, reducing nitrogen oxide emissions, improving thermal efficiency, and saving fuel consumption The problem

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