Temperature accurate control system for stepping heating furnace of hot rolling mill
A step-by-step heating furnace, precise control technology, applied in lighting and heating equipment, furnace, furnace type and other directions, can solve the problems of over-burning in the furnace, gas waste, reduction of furnace life, etc., to save gas and ensure the quality of the furnace. , the effect of increasing the life of the furnace
Inactive Publication Date: 2021-03-05
张家港凯胜控制设备工程有限公司
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Problems solved by technology
Because a large amount of iron scale is formed rapidly after the plate temperature is released from the furnace, it cannot be measured. The furnace temperature is used to calculate the plate temperature in the heating model. There is a difference between the two, and it is difficult to control accurately. The rising curve is difficult to control, resulting in inconsistent quality of steel billets, and a large amount of waste of gas, which will cause overburning in the furnace and shorten the life of the furnace
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[0011] Specific implementation methods: see Figure 1-2 A walking heating furnace temperature precise control system in a hot rolling steel mill, comprising a walking heating furnace and a main plc, wherein a first heating section 1 is sequentially arranged in the walking heating furnace according to the moving direction of a slab, The second heating section 2, the third heating section 3 and the soaking section 4, the first heating section 1, the second heating section 2, the third heating section 3 and the soaking section 4 are provided with a plurality of burners, The burner adjusts the flame intensity of the burner by controlling the air-fuel ratio through the burner regulating valve, and also includes a temperature measurement component and a combustion control pid module. Thermometer 5, the second infrared thermometer 6 arranged in the middle of the furnace roof of the third heating section 3, the third infrared thermometer 7 arranged on the left side of the furnace roof...
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The invention discloses a temperature accurate control system for a stepping heating furnace of a hot rolling mill. The surface temperature of a steel billet can be accurately measured through infrared temperature measuring instruments, the temperature measured by the first infrared temperature measuring instrument, the second infrared temperature measuring instrument and the fourth infrared temperature measuring instrument which are sequentially arranged and the time form a temperature rise curve, the temperature rise curve is compared with a standard temperature rise curve in a main plc, theoptimal pid adjusting parameter is obtained through a combustion control pid module, a signal is output to the main plc, the main plc controls a burner adjusting valve to adjust the air-fuel ratio, and therefore the flame intensity of a burner is adjusted, the surface temperature of the steel billet is controlled, the discharging quality of the steel billet is guaranteed, fuel gas is saved, and the service life of the furnace is prolonged.
Description
technical field [0001] The invention relates to a precise temperature control system of a walking heating furnace in a hot rolling steel mill. Background technique [0002] In the hot rolling mill, the combustion control of the heating furnace is usually realized by a computer model, and the billet is heated to a preset temperature by the heating furnace to meet the needs of rolling. Because a large amount of iron scale is formed rapidly after the plate temperature is released from the furnace, it cannot be measured. The furnace temperature is used to calculate the plate temperature in the heating model. There is a difference between the two, and it is difficult to control accurately. The ascending curve is difficult to control, resulting in inconsistent quality of steel slabs, and there is a lot of gas waste, and at the same time, it will cause overburning in the furnace and reduce the life of the furnace. Contents of the invention [0003] Aiming at the deficiencies of ...
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IPC IPC(8): F27B9/40
CPCF27B9/40
Inventor 李林顾晨锋吴荣庆陶峰
Owner 张家港凯胜控制设备工程有限公司