CN-121979311-A - Control system and method for water pressure of strip steel aerosol cooling nozzle

CN121979311ACN 121979311 ACN121979311 ACN 121979311ACN-121979311-A

Abstract

The invention discloses a control system for water pressure of a strip steel aerosol cooling nozzle. The method comprises the steps of setting target water pressure values for two split-flow headers on the upper surface and the lower surface of cooling strip steel respectively, monitoring actual water pressure in real time through a water pressure meter arranged on the headers, calculating water pressure deviation, generating control signals by adopting control algorithms such as PID and the like, adjusting the opening of an electric flow regulating valve arranged on an overflow pipe of the headers according to the control signals, and accurately controlling the water pressure of the headers through changing overflow quantity so as to enable the water pressure to be stabilized at a set value. The invention can effectively improve the uniformity of strip steel cooling and the product quality, and has fast system response and high control precision.

Inventors

ZHOU YOU
CHEN AIHUA
LIU XINYUAN
LI HUALONG
ZHOU CHAO
Yuan Liangmin
WU RONGZHOU
ZHOU DONGSHENG
SHI YIXIN

Assignees

张家港中美超薄带科技有限公司
江苏省沙钢钢铁研究院有限公司
江苏沙钢集团有限公司
江苏沙钢钢铁有限公司

Dates

Publication Date: 20260505
Application Date: 20260120

Claims (11)

1. A control system for the water pressure of a strip steel aerosol cooling nozzle is characterized by comprising an overflow pipe, an electric flow regulating valve, a water pressure meter, an upper machine position and a lower machine position, and Wherein the overflow pipe is arranged on a manifold of the aerosol cooling system, the electric flow regulating valve is arranged on the overflow pipe, the water pressure meter is arranged on the manifold and used for detecting the water pressure of a nozzle on the manifold, and The upper machine position is one of an industrial personal computer, a workstation or a touch screen, the lower machine position is one of a programmable logic controller or a singlechip, and the upper machine position and the lower machine position cooperatively realize system control and state monitoring.
2. The control system of claim 1, wherein said aerosol-cooling system comprises a water tank, a high pressure water pump, a main water pipe, two of said manifold sections, a flow regulator valve mounted on said manifold sections, a plurality of nozzle sets mounted on said manifold sections; The aerial fog cooling system supplies water through the water tank, pumps water and pressurizes the water through the high-pressure water pump, firmly lays the main water pipe through the support, and two split manifold pipes are symmetrically connected, each split manifold pipe is controlled by the flow regulating valve to control water flow respectively, and a plurality of groups of nozzles fixed by bolts are installed.
3. The control system of claim 1, wherein the diameter d_relief of the overflow tube and the diameter d_ diverter of the manifold satisfy the following relationship: 。
4. the control system of claim 1, wherein n sets of said overflow tubes and associated electrically operated flow regulating valves are provided on said manifold, wherein said n and said electrically operated flow regulating valves have a maximum opening area s_max satisfying the relationship: Where pi is the circumference ratio, s_ diverter =pi× (0.5×d_ diverter) × (0.5×d_ diverter).
5. A control method for the water pressure of a strip steel aerosol cooling nozzle, which is characterized by comprising the following steps: (A1) Setting a target water pressure value P_set for the manifold at the upper machine position; (A2) Setting an initial opening K_0 for an electric flow regulating valve on an overflow pipe at the upper machine position, and opening the electric flow regulating valve to the initial opening K_0 through a lower machine position; (A3) Monitoring an actual water pressure value P_actual in the shunt header in real time through a water pressure meter; (A4) Calculating a deviation e of the target water pressure value p_set from the actual water pressure value p_actual, wherein e=p_set-p_actual; (A5) Based on the deviation e, a control algorithm is adopted to generate a control signal u; (A6) According to the control signal u, the opening K of the electric flow regulating valve on the overflow pipe is regulated so as to change the flow passing through the overflow pipe and further regulate the water pressure in the distribution header pipe; (A7) Repeating steps (A3) to (A6) to form closed loop control, so that the actual water pressure value P_actual approaches the target water pressure value P_set.
6. The control method according to claim 5, wherein the diameter d_relief of the overflow pipe and the diameter d_ diverter of the manifold satisfy the following relationship: 。
7. the control method according to claim 5, wherein n sets of the overflow pipe and the associated electric flow rate regulating valve are provided on the manifold, wherein the n and the electric flow rate regulating valve maximum opening area s_max satisfy the following relationship: Where pi is the circumference ratio, s_ diverter =pi× (0.5×d_ diverter) × (0.5×d_ diverter).
8. The control method according to claim 5, wherein P_set is 10bar or less, and K_0 is 0.2 or less and 0.8 or less.
9. The control method according to claim 5, wherein the control algorithm covers any algorithm of PID control, fuzzy control, and fuzzy PID control or other applicable feedback control algorithm.
10. The control method according to claim 5, wherein the control algorithm is a PID control algorithm, the control signal Wherein Is a coefficient of proportionality and is used for the control of the power supply, As an integral coefficient of the power supply, As a result of the differential coefficient, Is the integration time.
11. The control method according to claim 5, wherein k=k·u, wherein Is constant and satisfies the following relationship that k.u is more than or equal to 0 and less than or equal to 100 percent.

Description

Control system and method for water pressure of strip steel aerosol cooling nozzle Technical Field The invention relates to the technical field of strip steel cooling in the metallurgical industry, and relates to a control system and a control method for water pressure of a strip steel aerosol cooling nozzle. Background In the production of cast-rolled strip steel, aerosol cooling is a critical process for controlling the cooling rate and final textural properties of the strip steel. The cooling effect (cooling intensity and uniformity) of the aerosol is affected by factors such as water flow density, droplet size and impact speed, which depend on water pressure and air pressure. In the production process, the water flow of the nozzle is required to be regulated according to the temperature of the strip steel, so that the water pressure of the nozzle correspondingly fluctuates, the surface of the strip steel is unevenly cooled, and the shape and the performance of the strip steel are affected. Disclosure of Invention Based on the background technology, the invention aims to provide the water pressure control system and the water pressure control method for the aerosol cooling nozzle, which are rapid in response and high in control precision, so as to realize uniform cooling of the surface of the strip steel. More specifically, the invention adopts the following technical scheme. According to one aspect of the invention, a control system for water pressure of a strip steel aerosol cooling nozzle is provided, and the control system comprises an overflow pipe, an electric flow control valve, a water pressure meter, an upper machine position and a lower machine position, wherein the overflow pipe is arranged on a distribution pipe of the aerosol cooling system, the electric flow control valve is arranged on the overflow pipe, the water pressure meter is arranged on the distribution pipe and is used for detecting water pressure of the nozzle on the distribution pipe, the upper machine position is one of an industrial personal computer, a workstation or a touch screen, the lower machine position is one of a programmable logic controller or a single chip microcomputer, and the upper machine position and the lower machine position are used for realizing system control and state monitoring in a cooperative mode. According to the control system of the invention, preferably, the aerosol cooling system comprises a water tank, a high-pressure water pump, a main water pipe, two split-flow headers, a flow regulating valve arranged on the split-flow headers and a plurality of nozzle groups arranged on the split-flow headers, wherein the aerosol cooling system is used for supplying water through the water tank, pumping water and pressurizing through the high-pressure water pump, firmly paving the main water pipe through a bracket and symmetrically connecting the two split-flow headers. Each of the manifold pipes is controlled by the flow regulating valve to flow water respectively, and is provided with a plurality of groups of nozzles fixed by bolts. According to the control system of the present invention, preferably, the diameter d_relief of the overflow pipe and the diameter d_ diverter of the manifold satisfy the following relationship: 0.2×D_diverter ≤ D_relief ≤ D_diverter。 According to the control system of the present invention, preferably, n sets of the overflow pipe and the associated electric flow rate regulating valve are provided on the manifold, wherein the n and the electric flow rate regulating valve maximum opening area s_max satisfy the following relationship: S\ diverter is less than or equal to 0.2 XS\u max x n is less than or equal to S_ diverter, wherein pi is the circumference ratio of the circle, S diverter =pi× (0.5×d/u) diverter) x (0.5 xd_ diverter). According to a second aspect of the present invention, there is provided a control method for water pressure of a strip gas mist cooling nozzle, the control method comprising the steps of: (A1) Setting a target water pressure value P_set for the manifold at the upper machine position; (A2) Setting an initial opening K_0 for an electric flow regulating valve on an overflow pipe at the upper machine position, and opening the electric flow regulating valve to the initial opening K_0 through a lower machine position; (A3) Monitoring an actual water pressure value P_actual in the shunt header in real time through a water pressure meter; (A4) Calculating a deviation e of the target water pressure value p_set from the actual water pressure value p_actual, wherein e=p_set-p_actual; (A5) Based on the deviation e, a control algorithm is adopted to generate a control signal u; (A6) According to the control signal u, the opening K of the electric flow regulating valve on the overflow pipe is regulated so as to change the flow passing through the overflow pipe and further regulate the water pressure in the distribution header pipe; (A7) Repeating steps (A3) to (A6