A method of frequency conversion water supply for ultra-fast cooling system of hot tandem rolling line

Abstract

The invention relates to a frequency conversion water supply method for an ultra-fast cooling system of a hot continuous rolling line, which belongs to the field of ultra-fast cooling of hot continuous rolling. The method includes: at the speed-up point of the water pump, calculate the pump frequency according to the ultra-fast cooling set pressure and water volume; The high temperature gauge at the exit of the finish rolling is used to dynamically adjust the water supply pressure of the water pump to make it reach the set value of ultra-fast cold pressure; when the strip head needs special cooling control, it needs to increase the speed twice; then when the strip head When the pyrometer at the exit of finishing rolling is reached, the water supply pressure of the water pump is dynamically adjusted to make it reach the ultra-fast cooling pressure setting value; when the tail of the strip leaves the ultra-fast cooling area, the pump station decelerates to the basic frequency state. This method solves the problem of stable water supply with high pressure and large flow rate, especially for the special cooling control of the strip head, which can achieve fast and stable ultra-fast cold water pressure, reduce energy consumption, reduce pipeline impact, reduce pipeline vibration, and protect equipment effect.

Description

technical field [0001] The invention belongs to the technical field of ultra-fast cooling of hot continuous rolling, and in particular relates to a frequency conversion water supply method for an ultra-fast cooling system of a hot continuous rolling line. Background technique [0002] Compared with conventional laminar flow and densified laminar flow cooling mode, the ultra-rapid cooling system has greater cooling intensity (2 to 5 times that of conventional laminar flow cooling), adopts ultra-rapid cooling technology, and cooperates with controlled rolling technology. Through the comprehensive control of the post-rolling cooling process such as cooling intensity, cooling strategy, and cooling path, the control of the structure type, shape and distribution of the steel can be realized, and then the effect of improving the structure of the steel and improving the comprehensive mechanical properties can be achieved. It is a hot-rolled steel An important technical means for pro...

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Problems solved by technology

[0003] During the use of the ultra-fast cooling system, the cooling water pressure is one of the most important control elements, because the stability of the ultra-fast cooling water pressure directly affects the stability of the flow rate of the ultra-fast cooling nozzle and the cooling efficiency of the strip, and the pressure control is unstable. It will have an adverse effect on the final cooling effect of the strip, especially when the temperature of the strip head needs special cooling control, such as dry head control. When the header is opened instantly, the pressure loss of the system is large, which is not conducive to the temperature control of the front stage, resulting in poor control effect. Therefore, reasonable control methods must be adopted to ensure the stability of ultra-fast cold water pressure

[0004] The ultra-fast cooling system has the characteristics of high pressure and large flow during the controlled cooling process. At the same time, the nozzle header pipeline and the overflow valve pipeline need to be adjusted frequently during the adjustment process, which will easily lead to large vibration of the pipeline and affect the equipment and system. Therefore, it is necessary to use reasonable control methods to slow down the impact of flow pressure changes on the system

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