A Dynamic Feedforward Combustion Control Method for Air-fuel Ratio of Walking Heating Furnace
A technology of dynamic feed-forward and control method, which is applied in the direction of combustion method, control combustion, lighting and heating equipment, etc. It can solve the problems of air-fuel ratio imbalance, increase of gas unit consumption index, and increase of energy consumption, so as to reduce energy consumption , reduce air pollution, reduce the effect of gas unit consumption
Active Publication Date: 2021-01-08
ANGANG STEEL CO LTD
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However, in actual operation, when the calorific value of gas fluctuates frequently, it is difficult for the operator to complete the prediction and adjustment in time, which leads to the air-fuel ratio is always in a state of imbalance, and eventually leads to an increase in energy consumption. Gas unit consumption index rises
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[0029] The dynamic feed-forward combustion control method of the air-fuel ratio of the walking heating furnace is based on the parallel and serial double-crossing limiting combustion control. The difference is that the air-fuel ratio is measured at any time and corrected in time; When the calorific value of gas changes, the air-fuel ratio is changed in time to compensate before the combustion is affected, so this kind of combustion can truly achieve reasonable combustion. The value is monitored in real time by the on-site calorific value meter, and it is used as a parameter to participate in the calculation after calculation by the formula.
[0030] In this system, gas calorific value measurement and air-fuel ratio correction calculation links are added. According to the fluctuation of calorific value, the correction value of air-fuel ratio can be found by experience or calculation. Since the correction operation occurs before the actual combustion, it can be compensated in t...
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The invention relates to an air-fuel ratio dynamic feedforward combustion control method for a step-type heating furnace. The air-fuel ratio dynamic feedforward combustion control method comprises thesteps that during combustion control, in a combustion control system, a temperature controller compares the set temperature and the detected temperature, through calculation processing, the air flowand the gas flow are adjusted through a double-cross amplitude limiting controller and setting of the air-fuel ratio, the gas heat value is detected in real time by a field gas heat valve instrument,the air-fuel ratio is calculated dynamically, the calculated air-fuel ratio replaces the set air-fuel ratio, the air flow and the gas flow are readjusted before air and gas combustion, and feedforwardadjustment is carried out. The air-fuel ratio dynamic feedforward combustion control method has the advantages that the air-fuel ratio coefficient and all stages of air excess coefficients are addedfor automatic control; gas heat value parameters are added into a primary combustion mode, so that air-fuel ratio parameters are dynamically adjusted according to an actual value of the gas heat value, and most effective utilization of gas is ensured; and the air-fuel ratio is always in a reasonable combustion state, the energy consumption amount is decreased finally, and unit consumption of the gas is lowered.
Description
technical field [0001] The invention belongs to the field of air-fuel ratio control, in particular to a dynamic feed-forward combustion control method for the air-fuel ratio of a walking heating furnace. Background technique [0002] The gas used in the hot rolling heating furnace process is the mixed gas of coke oven, blast furnace and converter. The three kinds of gas come from ironmaking and steelmaking. Due to the different production and operation plans of each month, the production ratio and distribution method of the three kinds of gas each month There are differences, which leads to fluctuations in the calorific value of the mixed gas within a certain range. The fluctuation of the gas calorific value is extremely unfavorable for controlling the unit gas consumption of the heating furnace, because the gas with different calorific values needs to consume a corresponding amount of air to maximize the utilization rate of the mixed gas. If the amount of air is too smal...
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IPC IPC(8): F23N1/02
CPCF23N1/02F23N2223/34F23N2239/04
Inventor 刘占全刘德辉孙伟王忠鹏张勇宁腾崔亚锋于任飞刘金超
Owner ANGANG STEEL CO LTD