Self-optimizing combustion control method of blast-furnace hot blast stove

Abstract

The invention relates to an automatic combustion control technology of a blast-furnace hot blast stove. The invention discloses a self-optimizing combustion control method of a blast-furnace hot blast stove. Air-fuel ratio K is used for replacing gas calorific value, current waste gas temperature subtracts waste gas temperature of the previous several minutes, the obtained value divides the current vault temperature, and then the obtained value subtracts the vault temperature value of the previous several minutes to replace an air excess coefficient; according to the current gas pressure, theinfluence coefficient of the vault temperature by calorific value of gas, the influence coefficient of the vault temperature by combustion time and the influence coefficient of the vault temperature by gas flow are calculated; the calculated coefficients are aligned into a sequence; from the point that the vault temperature is higher than 1100 DEG C, the coefficient in the vault temperature is averaged when the vault temperature rises by 1 DEG C, and the array of a group of coefficients is formed when temperature changes by 1 DEG C; when the vault temperature changes by 1 DEG C, the calculated coefficient array is compared with the array corresponding to the vault temperature in a sequence group produced by combustion in the previous round; and a new air-fuel ratio is calculated. The invention is easy to realize and has high reaction speed.

Description

technical field [0001] The invention relates to the combustion automatic control technology of a blast furnace hot blast stove. Background technique [0002] The hot blast stoves of the existing large and medium-sized blast furnaces are generally four hot blast stoves, which work in the way of two firing and two sending. The proportioning combustion is carried out in a controlled manner, and the operator modifies the air-fuel ratio from time to time according to the change of the vault temperature and the amount of residual oxygen in the exhaust gas. In order to meet the needs of blast furnace for high blast temperature. Generally, sufficient coke oven gas or converter gas with high calorific value is provided as far as possible, and the method of exhaust gas oxygen content plus double closed-loop ratio control and excess oxygen coefficient is used to meet the needs of automatic control and high wind temperature. [0003] In order to protect the equipment in the operation ...

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Problems solved by technology

[0010]Using method (2) Because it uses the residual oxygen measuring instrument installed in the exhaust gas flue to perform closed-loop tracking adjustment on the residual oxygen, because its control input parameters are already Therefore, the adjustment response is slow, which is not conducive to energy saving, and at the same time, it cannot meet the accuracy required by the best air-fuel ratio

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