BFG boiler air supply optimization control method

Abstract

The invention relates to a BFG boiler air supply optimization control method. The BFG boiler air supply optimization control method comprises the following steps that a flue gas oxygen content settingvalue of a target BFG boiler subtracts a flue gas oxygen content measurement value to obtain a flue gas oxygen amount deviation signal; the flue gas oxygen amount deviation signal is input into a PIcontroller, and the PI controller calculates the PI operation output amount based on control parameters; an air volume command is obtained through conversion of the blast furnace coal gas header coalgas flow rate; the air volume command is calculated through an oxygen amount correction command to obtain an air volume given value; the air volume given valve subtracts the actual measurement total air volume to obtain an air supply volume adjustment deviation signal; the air supply volume adjustment deviation signal is subjected to PI operation to obtain the blower variable frequency input quantity; and the blower variable frequency input quantity is used for adjusting the blower output. The BFG boiler air supply optimization control method enables air supply frequency conversion control torespond to the flue gas oxygen content deviation change to conduct continuous adjustment, quick response to the amount of the fuel quantity can be achieved, boiler combustion is stabilized, the systeminternal disturbance is suppressed, and the operational stability of a generator set is improved.

Description

technical field [0001] The invention belongs to the technical field of thermal automatic control, and in particular relates to an air supply optimization control method of a BFG (Blast Furnace Gas) boiler. Background technique [0002] In the process of steelmaking in steel mills, a large amount of blast furnace gas is produced, and the supporting BFG boiler fully burns the blast furnace gas and converts it into electric energy to realize the secondary utilization of resources. [0003] For conventional coal-fired power plants, the load adjustment is generally based on the electrical load to determine the load of the steam turbine, the change of the turbine load is reflected in the change of the main steam pressure, and then the boiler adjusts the amount of imported fuel according to the main steam pressure. The fuel of the BFG boiler is directly taken from the blast furnace gas pipeline network of the steel plant. Compared with the coal-fired power plant, there is no fuel p...

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Problems solved by technology

The delay of the regulation loop is particularly large, and it is impossible to directly correct the air supply volume by using the oxygen content of the flue gas to meet the regulation requirements.

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