Pulse-combustion control method of steel rolling heating furnace

Abstract

The invention discloses a pulse-combustion control method of a steel rolling heating furnace, namely at least four gas nozzles are arranged at the two sides of the heating furnace and located at the upper and lower parts of blanks in the blank along the length direction of the oven, thus whole-side-burning is formed for the heating furnace, the pulse of opening and closing of the whole gas nozzles is finished in T time and T is taken as a cycle period, each gas nozzle is opened at Ts interval successively, the quantity of the gas nozzles is N, thus in a pulse cycle period Ts=T/N, each gas nozzle open pulse order is set as required and opened by rated heating efficiency, each gas nozzle open pulse time is T1, T2...TQ, and the each gas nozzle open pulse time T1, T2... and TQ are calculated by the PID controller of the heating furnace control system according to the set value and the measured value of the furnace temperature. The pulse-combustion control method provided by the invention has the advantages of improving the furnace-shape, balancing the workload of the gas nozzle, improving fuel burn-off rate, strengthening the heat transfer efficiency of the blank, saving the fuel loss and improving control accuracy and flexibility of the furnace temperature, and is convenient in maintain and operation.

Description

technical field [0001] The invention relates to a pulse combustion control method of a steel rolling heating furnace. Background technique [0002] Generally, the steel rolling heating furnace adopts proportional combustion control, that is, double cross limit control, and the axial burner is arranged on the top or bottom of the heating furnace, or the flat flame burner is arranged on the top. The whole heating furnace is generally heated according to several partitions of the preheating section, heating section and soaking section. According to the heat demand of each temperature control zone of the heating furnace, the PID controller of the automatic control system of the heating furnace is used to adjust the gas supplied to each burner accordingly. According to a certain air-fuel ratio, the corresponding amount of gas-supporting gas is adjusted, that is, the temperature control target of the heating furnace is achieved by adjusting the heating capacity (large and small fi...

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Problems solved by technology

The combustion control method of the above-mentioned heating furnace makes the burner work load change greatly, the fuel burnout rate is poor, resulting in more pollutants, the heat transfer efficiency of the billet in the furnace is low, and the furnace temperature control flexibility is poor; and the arrangement of the burner makes The furnace structure is complex and the maintenance operation environment is poor

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