Method for controlling stability of gas flow at periphery of blast furnace

A method for controlling stability of gas flow at the periphery of a blast furnace, comprising the following steps:

• constructing a database of blast furnace operating parameters, the database comprising the number of gas flow peaks of lower part of the blast furnace PD, the number of gas flow peaks of upper part of the blast furnace PU, blast furnace feed, a distribution system, an air supply system and a cooling system collected in production history;
• and
• selecting the blast furnace operating parameters satisfying a first preset condition from the database to generate an instruction for setting the blast furnace operating parameters for a next operating stage;
• wherein the first preset condition comprises:
• the number of gas flow peaks of lower part of the blast furnace PD<a preset value PD0, and the blast furnace operating parameters corresponding to a minimum value of the number of gas flow peaks of upper part of the blast furnace PU are selected when the condition PD<PD0 is satisfied;
• wherein a statistical method for the number of gas flow peaks of lower part of the blast furnace PD and the number of gas flow peaks of upper part of the blast furnace PU is as follows:
• calculating a correlation coefficient Rk between a standard deviation of temperature ΔTk of the kth cooling stave and a standard deviation of heat load of the blast furnace ΔTL respectively, wherein k=5, 6, . . . , 12;
• counting the number of gas flow peaks, corresponding to a section of cooling stave with the highest correlation coefficient Rk in the 5th to 9th sections of cooling staves, as the number of gas flow peaks of lower part of the blast furnace PD;
• and
• counting the number of gas flow peaks, corresponding to a section of cooling stave with the highest correlation coefficient Rk in the 10th to 12th sections of cooling staves, as the number of gas flow peaks of upper part of the blast furnace PU.