Energy-saving and stable-pressure control method and device for hot rolling turbid high-pressure water system

Abstract

The application discloses a kind of energy-saving stable voltage control method and device of hot rolling turbidity high-pressure water system, it is related to steel metallurgy hot rolling process water treatment and control technical field, comprising the following steps: in the terminal position of the fluid conveying path of the high-pressure water system, setting a terminal pressure regulating element;Real-time operating pressure of the high-pressure water system is obtained, and current production condition is judged;According to the preset pressure-condition correspondence, by adjusting the output of water pump group and the opening of the terminal pressure regulating element, the system pressure is controlled in target pressure range, to realize the smooth switching between different production conditions, and inhibit the pressure fluctuation caused by flow mutation, realize near zero overflow operation, effectively eliminate pipeline abnormal vibration, and can adapt to different production conditions.

Description

Technical Field

[0001] This invention relates to the field of hot rolling process water treatment and control technology in iron and steel metallurgy, and in particular to an energy-saving pressure stabilization control method and device for a hot rolling turbid circulating high-pressure water system. Background Technology

[0002] In hot-rolled strip steel production, the DC3 high-pressure water system is responsible for supplying cooling water to the mill's work rolls and stands. The stability of its flow rate and pressure is crucial to roll life, strip steel product quality, and production continuity. However, the current industry-wide design of this system generally suffers from several drawbacks:

[0003] Serious energy waste: The original design was usually based on the maximum possible water consumption with a certain margin, resulting in a large amount of excess cooling water being directly discharged into the slag ditch through normally open overflow valves (such as DN500 pneumatic butterfly valves) during actual operation, causing a huge waste of water pump power. For example, the original design flow rate was 11458 m³ / h, while the actual water consumption was about 12000-13000 m³ / h, highlighting the problem of ineffective overflow.

[0004] The pipeline system experiences severe vibrations, posing a safety hazard: the original pressure regulating valves were typically installed in the middle section of the main pipeline, far from key water-using points such as the finishing mill. When the water volume in the finishing mill area changes drastically during conditions such as roll changing, the fluid's inertia causes violent pressure fluctuations at the pipeline's end, triggering a "water hammer" effect and resulting in strong vibrations throughout the entire pipeline system. This vibration not only leads to leaks at welded joints but has even caused serious accidents such as the tearing of the end blind flanges.

[0005] The control strategy is crude and lacks adaptability: existing controls mostly use simple proportional valves or single pressure relief valves, which lack the ability to adapt to system operating conditions (such as rolling and roll changing). If energy is saved by reducing the number of operating water pumps, the system pressure will be too low, resulting in insufficient cooling water for the rolling mill, or the pressure instability will cause more severe pipeline vibration, thus falling into the dilemma of not being able to achieve both "energy saving" and "stability".

[0006] In summary, there is an urgent need for a new type of control device and method that can fundamentally solve the problems of overflow waste and pipeline vibration, while ensuring the quality of cooling water supply. Summary of the Invention

[0007] The purpose of this invention is to provide an energy-saving pressure stabilization control method and device for a hot-rolled turbid ring high-pressure water system, so as to solve the problems existing in the prior art, achieve near-zero overflow operation, effectively eliminate abnormal pipeline vibration, and adapt to different production conditions.

[0008] To achieve the above objectives, the present invention provides the following solution:

[0009] This invention provides an energy-saving pressure stabilization control method for a hot-rolled turbid circulating high-pressure water system, comprising the following steps:

[0010] An end pressure regulating element is installed at the end of the fluid delivery path of the high-pressure water system;

[0011] The system obtains the real-time operating pressure of the high-pressure water system and determines the current production condition. Based on the preset pressure-condition correspondence, the system pressure is controlled within the target pressure range by adjusting the output of the water pump group and the opening of the terminal pressure regulating element, so as to achieve smooth switching between different production conditions and suppress pressure fluctuations caused by sudden changes in flow rate.

[0012] Preferably, the production conditions include rolling conditions and roll changing conditions.

[0013] Preferably, the preset pressure-operating condition correspondence includes:

[0014] When in rolling operation, the target pressure range is 7.5-9.0 MPa;

[0015] When in roll changing condition, the target pressure range is 4-8 MPa.

[0016] Preferably, when in the roll changing condition, the following steps are also included:

[0017] The linkage control enables the opening and closing of the terminal pressure regulating element and the main pressure regulating valve and overflow valve located in the middle section of the fluid delivery path;

[0018] Specifically, when the roller changing operation begins, the end pressure regulating element is activated first to quickly release pressure and buffer, and then the opening of the main pressure regulating valve and / or the overflow valve is adjusted according to the pressure change.

[0019] Preferably, the pump set includes a constant-speed pump and a variable-frequency pump, and the step of adjusting the output of the pump set includes fine-tuning the operating frequency of the variable-frequency pump based on the feedback of the real-time operating pressure.

[0020] The present invention also provides an energy-saving pressure-stabilizing control device for implementing the method described in any of the preceding claims in a hot-rolled turbid ring high-pressure water system, comprising:

[0021] The main pipeline is used to transport high-pressure turbid circulating water;

[0022] A water pump set is connected to the inlet of the main pipeline to provide power;

[0023] The main pressure regulating valve is installed in the middle section of the main pipeline;

[0024] An overflow valve is installed on the main pipeline;

[0025] An end pressure regulating element is installed at the end of the main pipeline to quickly respond to and dissipate pressure surges at the end of the system.

[0026] A pressure sensor is installed on the main pipeline to detect the system pressure in real time;

[0027] The controller is communicatively connected to the pressure sensor, the terminal pressure regulating element, the main pressure regulating valve, the overflow valve, and the water pump group, and is configured to execute the energy-saving pressure stabilization control method as described in any of the preceding items.

[0028] Preferably, the end pressure regulating element is a DN400 pneumatic pressure regulating valve.

[0029] Preferably, the overflow valve is one or more DN500 pneumatic butterfly valves.

[0030] Preferably, the pump set includes at least one variable frequency pump.

[0031] The present invention achieves the following technical effects compared to the prior art:

[0032] This invention provides an energy-saving pressure stabilization control method and device for a hot-rolled turbid ring high-pressure water system. By adding a pressure regulating element at the end of the system, a three-level pressure regulation system is constructed, consisting of rapid end-stage response, mid-stage coordinated regulation, and source-level frequency conversion control. This fundamentally changes the traditional single control mode of high-pressure water systems that relies solely on mid-stage pressure regulation. This innovative layout brings the pressure regulating node close to the actual water user, significantly shortening the transmission path of pressure fluctuations and effectively suppressing fluid inertial shocks caused by operating condition switching. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A schematic diagram of the energy-saving pressure stabilizing control device for the hot-rolled turbid ring high-pressure water system provided by the present invention;

[0035] In the diagram: 1. Main pipeline; 2. Pump set; 3. Main pressure regulating valve; 4. Overflow valve; 5. Terminal pressure regulating element. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] The purpose of this invention is to provide an energy-saving pressure stabilization control method and device for a hot-rolled turbid ring high-pressure water system, so as to solve the problems existing in the prior art, achieve near-zero overflow operation, effectively eliminate abnormal pipeline vibration, and adapt to different production conditions.

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Example 1

[0040] This embodiment provides an energy-saving pressure stabilization control method for a hot-rolled turbid ring high-pressure water system, including the following steps: at the end of the fluid transport path of the high-pressure water system, an end pressure regulating element 5 is set. Setting a pressure regulating element at the end of the system can quickly adjust the pressure fluctuation caused by the change in flow rate when the fluid is transported to the end, effectively alleviate the pressure impact at the end of the pipeline, avoid pipeline vibration caused by the "water hammer" effect, and improve the safety and stability of the system operation.

[0041] The system acquires the real-time operating pressure of the high-pressure water system and determines the current production conditions. This provides a basis for subsequent targeted adjustments to system parameters, enabling the system to adaptively adjust according to the needs of different production conditions and ensuring stable operation under various conditions.

[0042] Based on the preset pressure-operating condition correspondence, the system pressure is controlled within the target pressure range by adjusting the output of the water pump group 2 and the opening of the end pressure regulating element 5. This enables smooth switching between different production operating conditions and suppresses pressure fluctuations caused by sudden changes in flow rate. Adjusting the output of the water pump group 2 and the opening of the end pressure regulating element 5 according to the preset correspondence allows for precise control of the system pressure under different operating conditions. This enables smooth transitions between different production operating conditions, such as rolling and roll changing, avoiding significant pressure fluctuations due to operating condition changes, ensuring the cooling effect of the rolling mill, improving product quality, and extending the service life of the system equipment.

[0043] In a preferred embodiment, the production conditions include rolling and roll changing conditions. Clearly defining the main production conditions provides a clear classification basis for subsequently developing targeted pressure control strategies, enabling the system to optimize and adjust for the two different conditions of rolling and roll changing, and meet the system pressure requirements under different conditions.

[0044] In a preferred embodiment, the preset pressure-operating condition correspondence includes: a target pressure range of 7.5-9.0 MPa when in rolling condition; and a target pressure range of 4-8 MPa when in roll changing condition. Setting reasonable target pressure ranges for different operating conditions helps the system achieve optimal operating conditions under both rolling and roll changing conditions. Appropriate rolling condition pressure ensures effective roll cooling and strip product quality, while the relatively lower and more flexible pressure range under roll changing conditions meets the requirements of roll changing operations while avoiding damage to equipment from excessively high pressure or disruption to subsequent rolling preparations from excessively low pressure, ensuring stable and efficient system operation.

[0045] In a preferred embodiment, when in roll changing mode, the following steps are further included: linking the opening and closing of the end pressure regulating element 5 with the main pressure regulating valve 3 and the overflow valve 4 located in the middle of the fluid transport path; wherein, at the start of the roll changing operation, the end pressure regulating element 5 is opened first for rapid pressure relief and buffering, and then the opening of the main pressure regulating valve 3 and / or the overflow valve 4 is adjusted according to pressure changes. During roll changing, by linking the valves at different positions, especially by prioritizing the rapid pressure relief and buffering of the end pressure regulating element 5, the pressure shock caused by sudden changes in flow rate can be effectively addressed. This sequential control method can rapidly reduce pressure at the beginning of roll changing, avoiding damage to pipelines and equipment caused by a sudden increase in pressure. Then, the opening of the main pressure regulating valve 3 and the overflow valve 4 is precisely adjusted according to actual pressure changes to further stabilize the system pressure and ensure the smooth progress of the roll changing process.

[0046] In a preferred embodiment, the pump set 2 includes a constant-speed pump and a variable-frequency pump. Adjusting the output of the pump set 2 involves fine-tuning the operating frequency of the variable-frequency pump based on real-time operating pressure feedback. The pump set 2 employs a combination of a constant-speed pump and a variable-frequency pump. Utilizing the adjustable characteristics of the variable-frequency pump, the frequency is fine-tuned based on real-time operating pressure feedback, enabling precise adjustment of the pump set 2's output and achieving accurate control of the system's water supply. This not only meets the water demand under different operating conditions but also optimizes pump operating efficiency and reduces energy consumption while ensuring stable system pressure, thus achieving energy conservation.

[0047] Example 2 This example also provides an energy-saving pressure stabilizing control device for implementing the hot rolling turbid ring high-pressure water system as described in Example 1 above, as shown in Figure 1. It includes: a main pipeline 1 for conveying high-pressure turbid ring water. The main pipeline 1 serves as the conveying channel for high-pressure turbid ring water, providing a stable water flow transmission path for the entire system, ensuring that cooling water can be smoothly delivered to each water point to meet the needs of hot rolling production.

[0048] Pump set 2 is connected to the inlet of main pipeline 1 to provide power. Pump set 2 provides power for the transportation of high-pressure turbid circulating water, ensuring that the water flow can overcome pipeline resistance and be delivered to water-using equipment such as rolling mills according to the required flow rate and pressure of the system. It is the power source for the operation of the system, and its stable operation is crucial to the normal operation of the entire system.

[0049] The main pressure regulating valve 3 is installed in the middle section of the main pipeline 1. The main pressure regulating valve 3 installed in the middle section of the main pipeline 1 can regulate the overall water flow pressure in the pipeline. During the operation of the system, according to the pressure requirements of different working conditions, the water flow pressure is macroscopically controlled by adjusting the opening of the main pressure regulating valve 3 to ensure that the system pressure is within a suitable range and to meet the pressure stability requirements of equipment such as rolling mills.

[0050] Overflow valve 4 is installed on the main pipeline 1. Overflow valve 4 is used to overflow and discharge excess water when the system pressure is too high, to prevent the system pressure from exceeding the safe range, to protect the system, to avoid damage to pipelines, equipment and other components due to excessive pressure, and to ensure the safety of system operation.

[0051] The end pressure regulating element 5 is installed at the end of the main pipeline 1 to quickly respond to and eliminate pressure shocks at the end of the system. The end pressure regulating element 5 can quickly respond to the pressure shock problem that is prone to occur at the end of the system, adjust the pressure in a timely manner, effectively avoid pipeline vibration and equipment damage caused by the "water hammer" effect, improve the pressure stability at the end of the system, and further ensure the safe and stable operation of the entire system.

[0052] A pressure sensor is installed on the main pipeline 1 to detect the system pressure in real time. The pressure sensor detects the pressure in the main pipeline 1 in real time and provides real-time and accurate pressure data for system control. This enables the controller to make timely decisions based on pressure changes and adjust the operating status of equipment such as the water pump group 2 and valves to ensure that the system pressure is always within the target range.

[0053] The controller is communicatively connected to the pressure sensor, the terminal pressure regulating element 5, the main pressure regulating valve 3, the overflow valve 4, and the water pump group 2, and is configured to execute the energy-saving pressure stabilization control method of any one of Embodiment 1. As the core of the entire device, the controller receives pressure data from the pressure sensor through communication with each component, and coordinates the operation of the terminal pressure regulating element 5, the main pressure regulating valve 3, the overflow valve 4, and the water pump group 2 according to the energy-saving pressure stabilization control method of Embodiment 1, so as to achieve precise control of system pressure and smooth switching between different operating conditions, and ensure efficient, energy-saving and stable operation of the system.

[0054] In a preferred embodiment, the terminal pressure regulating element 5 is a DN400 pneumatic pressure regulating valve. The selection of a DN400 pneumatic pressure regulating valve as the terminal pressure regulating element 5 ensures that its specifications and pneumatic control method can meet the requirements for rapid and accurate adjustment of the system's terminal pressure, effectively cope with pressure shocks caused by sudden changes in flow, and match the pipeline specifications and pressure regulation requirements of the entire system, thus ensuring the stable operation of the system.

[0055] In a preferred embodiment, the relief valve 4 is one or more DN500 pneumatic butterfly valves. Using one or more DN500 pneumatic butterfly valves as the relief valve 4 allows for rapid overflow when the system pressure is too high, effectively preventing excessive system pressure. The pneumatic butterfly valve is easy to operate, has a fast response time, and can open and close promptly, providing reliable protection against system pressure issues.

[0056] In a preferred embodiment, the pump group 2 includes at least one variable frequency pump. This variable frequency pump allows for flexible adjustment of the pump's operating frequency based on real-time system pressure feedback, thereby precisely controlling the pump's output and achieving fine-tuning of system flow and pressure. This approach not only meets water demand under different operating conditions but also optimizes pump operating efficiency, reduces energy consumption, and achieves energy conservation.

[0057] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An energy-saving pressure stabilization control method for a hot-rolled turbid circulating high-pressure water system, characterized in that, Includes the following steps: An end pressure regulating element is installed at the end of the fluid delivery path of the high-pressure water system; Obtain the real-time operating pressure of the high-pressure water system and determine the current production conditions; Based on the preset pressure-operating condition correspondence, the system pressure is controlled within the target pressure range by adjusting the output of the water pump set and the opening of the terminal pressure regulating element, so as to achieve smooth switching between different production operating conditions and suppress pressure fluctuations caused by sudden changes in flow rate.

2. The energy-saving voltage stabilization control method according to claim 1, characterized in that, The production conditions include rolling conditions and roll changing conditions.

3. The energy-saving voltage stabilization control method according to claim 2, characterized in that, The preset pressure-operating condition correspondence includes: When in rolling operation, the target pressure range is 7.5-9.0 MPa; When in roll changing condition, the target pressure range is 4-8 MPa.

4. The energy-saving voltage stabilization control method according to claim 2 or 3, characterized in that, When in the roll changing condition, the following steps are also included: The linkage control enables the opening and closing of the terminal pressure regulating element and the main pressure regulating valve and overflow valve located in the middle section of the fluid delivery path; Specifically, when the roller changing operation begins, the end pressure regulating element is activated first to quickly release pressure and buffer, and then the opening of the main pressure regulating valve and / or the overflow valve is adjusted according to the pressure change.

5. The energy-saving voltage stabilization control method according to claim 1, characterized in that, The pump set includes a constant-speed pump and a variable-frequency pump. The step of adjusting the output of the pump set includes fine-tuning the operating frequency of the variable-frequency pump based on the feedback of the real-time operating pressure.

6. An energy-saving pressure-stabilizing control device for implementing the method of any one of claims 1 to 5 in a hot-rolled turbid ring high-pressure water system, characterized in that, include: The main pipeline is used to transport high-pressure turbid circulating water; A water pump set is connected to the inlet of the main pipeline to provide power; The main pressure regulating valve is installed in the middle section of the main pipeline; An overflow valve is installed on the main pipeline; An end pressure regulating element is installed at the end of the main pipeline to quickly respond to and dissipate pressure surges at the end of the system. A pressure sensor is installed on the main pipeline to detect the system pressure in real time; The controller is communicatively connected to the pressure sensor, the terminal pressure regulating element, the main pressure regulating valve, the overflow valve, and the water pump group, and is configured to execute the energy-saving pressure stabilization control method according to any one of claims 1 to 5.

7. The energy-saving voltage stabilizing control device according to claim 6, characterized in that, The end pressure regulating element is a DN400 pneumatic pressure regulating valve.

8. The energy-saving voltage stabilizing control device according to claim 6, characterized in that, The overflow valve is one or more DN500 pneumatic butterfly valves.

9. The energy-saving voltage stabilizing control device according to claim 6, characterized in that, The pump set includes at least one variable frequency pump.

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