Method for adjusting air-fuel ratio of annealing furnace

Abstract

The invention discloses a method for adjusting the air-fuel ratio of an annealing furnace. The method comprises the steps that the load mode of a normal work area is set as the automatic mode and theload mode of the area to be adjusted is set the manual mode; the number of nozzles in the area to be adjusted is N; the N-1th first differential pressure value delta P between flowmeters in turn of natural gas hole plates on the N nozzles can be measured, and the first average pressure difference delta P1 of the N-1th first differential pressure value delta P and the first average layer pressure difference delta P1' in the P layer nozzles are calculated; first to-be-adjusted nozzles when the N-1th first differential pressure value delta P is out of the range of delta P1+/-0.1 mbar is determined; the first average layer pressure difference delta P1' and the first average pressure difference delta P1 are compared, the first to-be-adjusted nozzle layer with delta P1' larger than delta P1 andthe second to-be-adjusted nozzle layer with delta P1' smaller than delta P1 which are adjusted in sequence are determined and are subjected to primary adjusting. The technical effects of sufficientlycombusting the fuel, and reducing pollution of black smoke, NOx and SOx to the environment are achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for adjusting the air-fuel ratio of an annealing furnace. Background technique [0002] When the annealing furnace replaces the damaged radiant tube in the furnace area, most of the valve positions are changed. After normal production, the flow balance of air and gas in each area of ​​the furnace is seriously unbalanced, which is manifested by the abnormal increase of O2 and CO content in the flue gas composition. Black smoke from the chimney and other phenomena, and when the CO content in the flue gas component is too high, the system will stop the burner, which seriously affects the production rhythm. [0003] Due to the abnormal flow balance of air and gas in the furnace area during normal production of the annealing furnace in the prior art, it leads to a technical problem that the CO content in the flue gas is too high and affects the production. Contents of th...

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Problems solved by technology

[0004] The embodiment of the present invention provides a method for adjusting the air-fuel ratio of the annealing furnace, which is used to solve the problem that the annealing furnace in the prior art has an abnormal flow balance of air and gas in the furnace area during normal production, resulting in excessive CO content in the flue gas and affecting production. The technical problem is to achieve full combustion of fuel, and at the same time reduce the heat loss of anoxic combustion and peroxygen combustion, and reduce black smoke and NO to the greatest extent. x and SO x The pollution brought to the environment also reduces the physical loss taken away by the flue gas leaving the furnace and prolongs the technical effect of the service life of the radiant tube

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