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The advantages of Fully continuous hot rolling technology over semi-continuous hot rolling technology-2
DATE：9/16/2019 HIT：618 SOURCE： AUTHOR：
7.Rolling temperature comparison
• Fully continuous rolling is closely linked to each pass and the temperature drop is small.
• Full-continuous rolling scheme, after the rough rolling, all the heat-insulation covers are set, and the temperature difference between the middle and the tail is small, about 40 degrees.
• Reversible rolling mill, it is not easy to take simple and effective intermediate insulation measures. Need to invest in hot coil boxes, and invest a lot.
8.Fuel consumption and burnout comparison
• The semi-continuous rolling process has a temperature of about 1250 ° C. According to the actual data of our 10 production lines, the furnace temperature can be directly reduced to 1100 ° C - 1150 ° C.
• Reduce fuel consumption by about 20-30%, semi-continuous rolling blast furnace gas consumption by 340-350 m^3/t, and full continuous rolling blast furnace gas consumption of 230-260 m^3/t.
• The heating time is also greatly shortened, which can directly reduce the oxidation of iron oxide skin by 0.15-0.2%. According to the annual output of 1.5 million tons, the difference between finished product and waste slag is 2,000 yuan/ton, and the annual direct economic benefit is 450-600 million yuan.
• The reduction in heating time greatly increases the capacity of the furnace.
9.Reduce the type of blanks
The rough rolling adopts the continuous rolling unit, which can adopt the rough rolling wide hole type or the vertical roll narrowing, so that one kind of blank can correspond to various specifications, and the maximum width can be displayed 100mm, which reduces the specification of the blank, and can reduce the connection. The number of cast crystallizers and the loss of capacity due to the mold changer. The entire line is equipped with 3-5 sets of vertical rolling mills, which can automatically control the width at ±30mm.
10.Water mist dust removal effect
• Full continuous rolling is easy to set up water mist to remove dust between the racks, which makes the rolling workshop environment good.
• When the reversing mill is used, it is not easy to take dust removal methods, and the working environment is rather bad.
11.The investment is quite
Compared with the rough rolling large motor and large rolling mill with semi-continuous rolling, the irreversible form of small motor is adopted, which reduces the investment of motor and electric control. With this investment for the increase of mechanical equipment, the overall investment and semi-continuous rolling are not much different.