The radiant tube is the key equipment for the continuous annealing furnace of the galvanizing unit. It is used to radiate the strip steel to eliminate the stress in the strip and improve the plasticity. The purpose of the annealing is to reach the purpose of annealing. However, if the leakage tube will cause the unit to bring the operation The consequences, and even affect the normal operation of production. To prevent the radiation tube is burned to extend the life of the radiation tube, to take certain measures.
1, adjust the burning gas and combustion air combustion ratio, due to the atmosphere in the nitrogen atmosphere, excessive oxygen will occur a strong nitriding oxidation, so that the radiation tube corrosion damage, so the combustion exhaust O2% content control in less than 2% The
2, gas pressure control valve and air pressure control valve action should be sensitive, do not lag to ensure that the combustion gas pressure and air pressure stability, to ensure complete combustion of gas.
3, exhaust exhaust fan speed smooth, reduce the combustion flame fluctuations.
4, the combustion of the air heat exchanger can not be leaked, to avoid the air was exhaust gas blown away, affecting the gas and air mixed combustion ratio.
5, the heat exchanger connection flange and seal can not be leaked, to avoid the outside air into the air, as far as possible to improve the temperature of combustion air.
6, if the conditions and funding permit, you should install a large heat exchanger, the use of emissions to the plant outside the waste heat (up to 390 ℃ first preheated air, air into the burner tube heat exchanger after the second Preheat the air to raise the temperature of the combustion air.
7, the radiation tube temperature> 400 ℃ (furnace temperature, is strictly prohibited to open the lid and remove the burner and heat exchanger, to avoid high temperature radiation tube cold air shrinkage caused by cracks.
8, as far as possible to arrange the same heating needs of the strip production.
9, the production as far as possible to maintain the uniformity of the working temperature, to avoid the rapid ignition of the burner and stop the burner work to carry out purge cooling operation.