Method and system for automatically controlling combustion-supporting air pressure of heating furnace

The invention belongs to the field of combustion control of hot-rolling heating furnaces, and discloses a method and a device for automatically controlling air pressure of the heating furnace. The method comprises the following steps that: an air pressure setting corrector refers to a valve position feedback value of each branch pipe regulating valve, and performs correction on the basis of the original air pressure set value, so that the air pressure set value can integrate flow characteristics of a fan and regulating characteristics of the branch pipe regulating valves. The device comprises a fan flow regulating device, an air pressure detecting device, a fuel gas flow detecting device, an air quantity requirement calculator, an air pressure setting calculator, an air pressure setting corrector, an air pressure control regulator and a plurality of sets of branch pipe valve position feedback devices. The method and the device provided by the invention can realize automatically and efficiently controlling com