Frequency-changing water supply method for hot continuous line rolling and ultra-fast cooling system

Abstract

The invention discloses a frequency-changing water supply method for a hot continuous line rolling and ultra-fast cooling system, and belongs to the field of hot continuous rolling and ultra-fast cooling. The frequency-changing water supply method comprises the steps that at an accelerating point of a water pump, the frequency of the water pump is calculated according to the ultra-fast cooling setpressure and water quantity; when the strip steel head does not need special cooling control, a pump station is directly accelerated to the calculated frequency, and then when the strip steel head reaches a pyrometer of a finishing rolling outlet, the water supply pressure of the water pump is dynamically adjusted to reach the ultra-fast cooling pressure set value; when the strip steel head needsspecial cooling control, two times of accelerating are required; then when the strip steel head reaches the pyrometer of the finishing rolling outlet, the water supply pressure of the water pump is dynamically adjusted to reach the ultra-fast cooling pressure set value; and when the strip steel tail leaves an ultra-fast cooling area, the pump station is decelerated to the base frequency state. According to the frequency-changing water supply method, the problem of high-pressure and large-flow stable water supply is solved, especially when special cooling control is conducted on the strip steel head, ultra-fast cooling of the water pressure can be quickly and stably conducted, energy consumption is lowered, pipeline impact is reduced, pipeline vibration is lowered, and thus equipment is protected.

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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