Baoshan Iron & Steel Co., Ltd.

Dejian Wen

Yongfeng Liu

Huazhong Gu

Guoqiang Qian

Jun Zhang

Bin Yin

Rong Chen

Hongxu Hei

Peili Zhang

Chunguo Lv

Zhicheng Wang

Deyang Hu

A method for controlling furnace pressure of a continuous annealing furnace is disclosed. The method comprises detecting a coal gas flow volume and an air flow volume in each section by use of a coal gas flow volume detector and an air flow volume detector disposed in each section of a continuous annealing furnace, respectively, adding up the coal gas flow volume detected in each section to obtain a total input coal gas flow volume; adding up the air flow volume detected in each section to obtain a total input air flow volume, and calculating a pre-combustion gas pressure in the furnace based on the total input coal gas flow volume and the total input air flow volume; detecting compositions of the coal gas and a ratio of the coal gas to the air by use of a composition detector; detecting a pre-combustion gas temperature in the furnace by use of a thermocouple; predicting post-combustion gas compositions and a total gas volume based on chemical combustion reaction equations and based on the total input coal gas flow volume, the total input air flow volume, the coal gas compositions and the ratio of the coal gas to the air; igniting the coal gas and the air in the furnace; and detecting a post-combustion gas temperature in the furnace by use of a thermocouple; calculating a post-combustion gas pressure in the furnace based on the pre-combustion gas pressure in the furnace, pre-combustion gas temperature in the furnace and the post-combustion gas temperature in the furnace; and calculating an opening degree for an exhaust gas fan based on the pre-combustion gas pressure in the furnace and the post-combustion gas pressure in the furnace and by use of a gas increment pass algorithm, and using the opening degree to control the exhaust gas fan.

Method and apparatus for controlling a furnace pressure of a continuous annealing furnace

A method for controlling furnace temperature of a fired heating furnace is disclosed, comprising: measuring furnace temperatures to obtain furnace temperature feedback values; calculating the differences between furnace temperature setting values and the furnace temperature feedback values as discrepancy values DV, in accordance with the furnace temperature feedback values and the furnace temperature setting value; calculating the differences between the furnace temperature setting values and the furnace temperature feedback values in a unit time, i.e., the gradient of furnace temperature change values, as discrepancy values DV; obtaining a speed V of a fired heater machine set from a speed adjuster of the fired heater machine set, and obtaining a first multiple feed forward output components FFin accordance with the speed V of the machine set (V); obtaining a second multiple feed forward output components FFin accordance with the differences between the furnace temperature setting values and the furnace temperature feedback values, i.e., the discrepancy values DV; looking up a PID control parameter in accordance with the discrepancy values DVand DV, based on fuzzy control rule, and creating an adjusting control parameter OPin accordance with the PID control parameter; controlling a valve for regulating coal gas flow and a valve for regulating air flow by combining the adjusting control parameter OPwith the first multiple feed forward components FFand the second multiple feed forward components FFas a final control output value.

Method and device for controlling furnace temperature of burning heating furnace

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Shanghai, China

Dejian Wen