Ductile pipe annealing furnace thermal efficiency of energy saving measures to improve the annealing furnace for annealing furnace continuous ball iron pipe, the annealing process is more special, furnace body is longer, large span, and rapid cooling, and then adopted forced cooling, so the thermal efficiency is low.
For annealing furnace structures have been confirmed, to improve the thermal efficiency of the furnace, only from the operation of the annealing furnace.
To determine reasonable heating temperature and annealing process of the ductile iron pipe annealing time requirement for the annealing temperature is unfavorable and exorbitant, annealing time also shoulds not be too long, to save energy and reduce the deformation of ball iron pipe is very good.
But the annealing temperature and annealing time is limit, reduce the annealing temperature is increasing annealing time;
Shorten the increase of annealing temperature, annealing time otherwise it will reduce the elongation of the iron ball.
For this kind of situation, based on past experience, in meet the requirements of annealing process and don't make the tube deformation out-of-tolerance condition, to determine the different specifications of the ball iron pipe in annealing furnace heating section of the annealing temperature and annealing time, as shown in table.
Pipe diameter/mm DN100 ~ DN300DN400 ~ DN600DN700 ~ DN800 heating section temperature / 20 to 1090 + 20 ℃ 1070 + 1100 + 20 preservation time/min556050 nodular cast iron pipe in the heat enthalpy increment nodular cast iron pipe in the annealing furnace in annealing furnace heat enthalpy increment is mainly composed of ball iron pipes in heating furnace temperature and iron pipe boiling temperature of the decision, thus reducing the ball iron pipe in furnace heat enthalpy increment is mainly to reduce the boiling temperature of annealing temperature and improve the ball iron pipe.
Reasonable for different pipe diameter of the lower annealing temperature ball iron pipe annealing temperature is, the more save fuel, but the ball iron pipe annealing process requires annealing furnace heating furnace temperature is 1050 ~ 1100 ℃, the heat preservation period of furnace temperature is 960 ~ 1000 ℃, in order to ensure that the ball iron pipe annealing quality, under the condition of the technology allowed, should be carried out in accordance with the lower limit of temperature control, especially in small diameter pipe can decrease the heating period of furnace temperature.
Improve the ductile pipe
boiling temperature in the process of production, make full use of material on the end of the process of waste heat is an important way to save energy.
According to the theoretical calculation, the ball iron pipe heated to 1000 ℃, 600 ℃ and 25 ℃ charging into the 320000 kj, lower than the t tube energy consumption can save about 20 m3 coke oven gas or heavy oil 8 kg.
Pipes company annealing furnace annealing ability about centrifuge production capacity of the existing 2 times, to adopt the intermittent concentrated annealing method.
During annealing furnace pipe online guarantee under the premise of continuous annealing heat pipe before charging, shorten the transmission time of heat pipe, make half pipe charging temperature from ambient temperature to 600 ℃ or so.
To improve the ratio of hot delivery and charging pipe temperature, energy saving effect is remarkable.
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