RH furnace muddy water circulating water automatic adjusting system

Abstract

The invention discloses an automatic regulating system for circulating turbid water of an RH (Ruhrstahl Heraeus) furnace, which belongs to the technical field of ferrous metallurgy and comprises a signal acquisition module, a control module and an execution module which are mounted in a turbid water circulating system of the RH furnace, the signal acquisition module comprises an RH furnace vacuum state sensor, a flow sensor, a pressure sensor and a temperature sensor; the control module is used for judging the current production stage of the RH furnace and outputting a corresponding control instruction according to the production stage; the execution module comprises a pneumatic control valve and a variable-frequency governor; the pneumatic adjusting valve adjusts the opening degree of the pneumatic adjusting valve according to the control instruction so as to control the flow of the tail end water using side; and the variable-frequency governor adjusts the rotating speed of the muddy water supply pump according to the instruction so as to ensure the set pressure requirement of the RH furnace muddy water branch pipe. The opening degree of the branch pneumatic control valve is adjusted according to the vacuum operation signal of the RH furnace, the rotating speed of the muddy water supply pump is adjusted in combination with the variable-frequency governor, the water supply pressure and flow are automatically adjusted according to the production state, and the energy consumption of the RH furnace muddy water circulation system is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of iron and steel metallurgy, and in particular to an automatic regulating system for turbid water circulation of an RH furnace. Background Art

[0002] The RH furnace is a vacuum refining facility used to produce high-quality molten steel. Its workflow is as follows: Before treating the molten steel, a dip tube is immersed in the molten steel in the ladle to be treated. When the vacuum tank is evacuated to a vacuum state, the molten steel is forced through the dip tube by atmospheric pressure to flow into the vacuum tank. Once in the vacuum tank, the molten steel undergoes a series of metallurgical reactions (such as carbon oxidation). This repetitive process purifies the molten steel.

[0003] The RH furnace dirty water system is a circulating water treatment system used in conjunction with the RH furnace, primarily treating dirty water generated during the RH furnace's production process. The dirty water circulating subsystem uses spray cooling to remove exhaust steam from the steam ejector, thereby evacuating the vacuum tank to a vacuum state. For example, an RH furnace refining cycle typically lasts 40 minutes, consisting of 20-25 minutes of operating time (vacuum refining phase) and 10-15 minutes of rest time (furnace downtime due to station switching, ladle hoisting, and other downtime). Water temperature fluctuates during operation and downtime. This means that the furnace is idle for approximately one-third of each production cycle. During this time, circulating cooling water can be further reduced, but not eliminated. Traditional constant-pressure water supply systems rely on a fixed number of operating pumps and manual valves to adjust the water supply pressure. This model fails to dynamically adjust the water supply volume and pressure based on the RH furnace's actual production phase (non-vacuum, pre-vacuum, and full vacuum), resulting in energy waste and equipment wear.

[0004] Based on this, the present invention designs an automatic regulating system for turbid water circulating water of an RH furnace to solve the above problems. Summary of the Invention

[0005] To address the above-mentioned shortcomings of the prior art, the present invention provides an automatic regulation system for turbid water circulation in an RH furnace. This system can automatically adjust the water supply pressure, flow rate, and return water according to the RH furnace production stage, achieving energy conservation, consumption reduction, and stable operation.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] An automatic regulating system for turbid water circulation of an RH furnace, comprising a signal acquisition module, a control module and an execution module installed in the turbid water circulation system of the RH furnace;

[0008] The signal acquisition module includes an RH furnace vacuum state sensor, a flow sensor, a pressure sensor and a temperature sensor; wherein the RH furnace vacuum state sensor is installed on the RH furnace and connected to the control module for collecting the vacuum operation signal of the RH furnace; a plurality of pressure sensors are provided, which are respectively installed on the turbid water supply pump outlet main pipe and the RH furnace inlet and connected to the control module; the pressure sensor on the turbid water supply pump outlet main pipe is used to collect the turbid water supply pump outlet water supply pressure, and the pressure sensor at the RH furnace inlet is used to collect the RH furnace supply pressure; the temperature sensor is installed on the turbid water supply pump outlet main pipe and connected to the control module for collecting the circulating water temperature; the flow sensor is installed on the turbid water supply pump outlet main pipe and connected to the control module for collecting the main pipe flow;

[0009] The control module is used to receive the sensor signal transmitted by the signal acquisition module, determine the current production stage of the RH furnace, and output corresponding control instructions according to the production stage;

[0010] The execution module includes a pneumatic control valve and a variable frequency speed regulator; wherein the pneumatic control valve is installed on the RH furnace dirty water branch pipe, and is used to receive the control instructions of the control module, and adjust the opening of the pneumatic control valve according to the control instructions, thereby controlling the flow rate on the terminal water side; the variable frequency speed regulator is installed on the dirty water supply pump, and is used to receive the instructions of the control module, and adjust the speed of the dirty water supply pump according to the instructions to ensure the pressure requirement set for the RH furnace dirty water branch pipe.

[0011] Furthermore, the RH furnace control system provides a signal to determine whether the current production stage of the RH furnace is a non-vacuum stage, a pre-vacuum stage, or a formal vacuum stage.

[0012] Furthermore, when the RH furnace is in the non-vacuum stage, the control module sends an instruction to the pneumatic control valve to reduce the opening to 10-30%; at the same time, the control module uses the PID control algorithm model to perform calculations and sends a frequency reduction adjustment instruction to the variable frequency speed regulator. The pressure of the turbid water supply pump outlet main pipe and the pressure of the RH furnace turbid water branch pipe are collected through the pressure sensor, so that the pressure of the RH furnace turbid water branch pipe is stabilized at the set value P.

[0013] Furthermore, when the RH furnace is in the pre-vacuum stage, the control module sends an instruction to the pneumatic control valve to increase the opening to 60-70%; at the same time, the control module uses the PID control algorithm model to perform calculations and sends a frequency increase adjustment instruction to the variable frequency speed regulator. The pressure of the turbid water supply pump outlet main pipe and the pressure of the RH furnace turbid water branch pipe are collected through the pressure sensor, so that the pressure of the RH furnace turbid water branch pipe is stabilized at the set value P.

[0014] Furthermore, when the RH furnace is in the formal vacuum stage, the control module sends an instruction to the pneumatic control valve to increase the opening to 100%; at the same time, the control module uses the PID control algorithm model to perform calculations and sends a frequency increase adjustment instruction to the variable frequency speed regulator. The pressure of the turbid water supply pump outlet main pipe and the pressure of the RH furnace turbid water branch pipe are collected through the pressure sensor, so that the pressure of the RH furnace turbid water branch pipe is stabilized at the set value P.

[0015] Furthermore, the set value P is 0.45 MPa.

[0016] Furthermore, the RH furnace dirty water circulation system includes a cooling tower, a dirty water well, a dirty water supply pump, a self-cleaning filter, a pressure, flow, and temperature gauge, an RH furnace, a water collection tank, and a return water pump. The cooling tower is located above the dirty water well, which is connected to several sets of dirty water supply pumps, which are in turn connected to the self-cleaning filters. The self-cleaning filters are connected to one or more sets of RH furnace dirty water branch pipes via the dirty water supply pump outlet manifold. The dirty water supply pump outlet manifold is equipped with a pressure, flow, and temperature gauge to display the pressure, flow, and temperature on the water supply side. The other ends of the RH furnace dirty water branch pipes are connected to the RH furnace spray pipes. The RH furnace spray pipes are located above the water collection tank, and the water collection tank outlet is connected to the cooling tower via the return water pump, thus completing the RH furnace dirty water circulation.

[0017] Furthermore, the control module includes a central controller PLC.

[0018] Compared with the existing technology, the present invention has the following beneficial effects: 1. Significant energy saving: the frequency conversion adjustment of the water pump is linked to the production status, which can reduce power consumption by 20%-40%;

[0019] 2. High degree of automation: Automatically adjust the water supply flow through the valve status signal, reducing manual operation by 80%;

[0020] 3. Stable water supply: Adaptive pressure control under constant pressure control reduces complaints in the production workshop and improves cooling efficiency;

[0021] 4. Equipment protection: The frequency converter reduces mechanical shock and extends the life of the water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0023] Figure 1 This is a structural schematic diagram of an automatic regulation system for turbid water circulating water in an RH furnace according to the present invention.

[0024] Figure 2 The present invention is a flow chart of an automatic regulating system for turbid water circulating water in an RH furnace.

[0025] Figure 3 The present invention is a flowchart of an algorithm of an RH furnace turbid water circulating water automatic adjustment system. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] Example 1: Please refer to the accompanying drawings of the specification Figure 1-Figure 3 , an RH furnace turbid water circulating water automatic regulating system, comprising a signal acquisition module, a control module and an execution module installed in the RH furnace turbid water circulating system;

[0028] The signal acquisition module includes an RH furnace vacuum state sensor, a flow sensor, a pressure sensor and a temperature sensor;

[0029] Among them, the RH furnace vacuum state sensor is installed in the RH furnace and connected to the control module to collect the vacuum operation signal of the RH furnace;

[0030] There are multiple groups of pressure sensors, which are installed at the main outlet pipe of the turbid water supply pump and the inlet of the RH furnace, and are connected to the control module. The pressure sensor on the main outlet pipe of the turbid water supply pump is used to collect the water supply pressure of the turbid water supply pump outlet, and the pressure sensor at the inlet of the RH furnace is used to collect the water supply pressure of the RH furnace;

[0031] The temperature sensor is installed on the outlet main pipe of the turbid water supply pump and connected to the control module to collect the temperature of the circulating water;

[0032] The flow sensor is installed on the main outlet pipe of the turbid water supply pump and connected to the control module to collect the main pipe flow;

[0033] The control module includes a central controller PLC, which is used to receive sensor signals transmitted by the signal acquisition module, determine the current production stage of the RH furnace (no vacuum, pre-vacuum, full vacuum), and output corresponding control instructions according to the production stage;

[0034] The method for determining the current production stage of the RH furnace is as follows:

[0035] The RH furnace control system provides a signal to determine whether the current production stage of the RH furnace is the non-vacuum stage, the pre-vacuum stage, or the formal vacuum stage.

[0036] The execution module includes a pneumatic control valve and a variable frequency speed regulator;

[0037] Among them, the pneumatic control valve is installed on the RH furnace dirty water branch pipe, which is used to receive the control instructions of the central controller and adjust the opening of the pneumatic control valve according to the control instructions, thereby controlling the flow rate on the terminal water side;

[0038] The variable frequency speed regulator is installed on the turbid water supply pump to receive instructions from the central controller and adjust the speed of the turbid water supply pump according to the instructions to ensure the pressure requirement set for the RH furnace turbid water branch pipe.

[0039] The central controller outputs corresponding control instructions according to the production stage, including:

[0040] When the RH furnace is in the non-vacuum stage, the central controller sends a command to the pneumatic control valve to reduce the opening to 10-30%. At the same time, the central controller uses the PID control algorithm model to calculate and send a frequency reduction adjustment command to the variable frequency speed regulator. The pressure of the turbid water supply pump outlet main pipe and the pressure of the RH furnace turbid water branch pipe are collected through the pressure sensor, so that the pressure of the RH furnace turbid water branch pipe is stabilized at around 0.45MPa (adjustable).

[0041] When the RH furnace is in the pre-vacuum stage, the central controller sends a command to the pneumatic control valve to increase its opening to 60-70%. At the same time, the central controller uses the PID control algorithm model to perform calculations and sends a frequency adjustment command to the variable frequency speed regulator. The pressure of the turbid water supply pump outlet main pipe and the pressure of the RH furnace turbid water branch pipe are collected through the pressure sensor, so that the pressure of the RH furnace turbid water branch pipe is stabilized at around 0.45MPa (adjustable).

[0042] When the RH furnace is in the formal vacuum stage, the central controller sends an instruction to the pneumatic control valve to increase the opening to 100%; at the same time, the central controller uses the PID control algorithm model to perform calculations and sends a frequency increase adjustment instruction to the variable frequency speed regulator. The pressure of the turbid water supply pump outlet main pipe and the pressure of the RH furnace turbid water branch pipe are collected through the pressure sensor, so that the pressure of the RH furnace turbid water branch pipe is stabilized at around 0.45MPa (settable).

[0043] The present invention reconstructs the original RH furnace turbid water circulation system, adding two variable frequency speed regulators, two pneumatic regulating valves for circulation branches, an RH furnace vacuum state sensor, a pressure sensor, a temperature sensor, and a central controller. The pressure sensor is used to collect the pressure of the turbid water supply pump outlet main pipe on the water supply side and the pressure of the terminal water supply, namely the RH furnace spray pipe. Constant pressure control is adopted, and a variable frequency speed regulator is added to the water supply side to stabilize the terminal water supply pressure at around 0.45 MPa (settable). The vacuum operation signal of the RH furnace is collected to further control the water volume, and the water flow rate is based on whether it can meet the flow demand in real time. The central controller controls the opening of the pneumatic regulating valve and the frequency of the variable frequency speed regulator to match the water supply pressure with the needs of the current production stage. The variable frequency speed regulator smoothly adjusts the water pump speed to reduce the water hammer effect and extend the life of the equipment. If multiple RH furnaces share a common main outlet pipe for the dirty water supply pump, pneumatic control valves are installed on each RH furnace's dirty water branch pipe. By adjusting the opening of the pneumatic control valves based on the operating status of each furnace, the flow rate into each RH furnace's dirty water branch pipe is regulated, achieving demand-based supply control. This modification enables the RH furnace dirty water circulation system to automatically adjust the water flow rate based on production conditions, resulting in significant energy savings.

[0044] The present invention adjusts the opening of the branch pneumatic regulating valve according to the vacuum operation signal of the RH furnace, and adjusts the speed of the turbid water supply pump in combination with a variable frequency speed regulator, automatically adjusts the water supply pressure and flow according to the production status, and reduces the energy consumption of the turbid water circulation system of the RH furnace.

[0045] Example 2: Please refer to the attached drawings of the specification Figure 1 The RH furnace turbid water circulation system includes a cooling tower, a turbid water well, a turbid water supply pump, a self-cleaning filter, a pressure flow temperature gauge, an RH furnace, a water collection tank and a return water pump; the cooling tower is located above the turbid water well, the turbid water well is connected to several groups of turbid water supply pumps, the turbid water supply pumps are connected to the self-cleaning filter, the self-cleaning filter is connected to one or more groups of RH furnace turbid water branch pipes through the turbid water supply pump outlet main pipe, and a pressure flow temperature gauge for displaying the pressure, flow and temperature on the water supply side is installed on the turbid water supply pump outlet main pipe. The other end of the RH furnace turbid water branch pipe is respectively connected to the RH furnace spray pipe; the RH furnace spray pipe is located above the turbid water collection tank, and the water outlet of the turbid water collection tank is connected to the cooling tower through the return water pump to realize the turbid water circulation of the RH furnace.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An automatic regulating system for turbid water circulation of RH furnace, characterized in that: It includes a signal acquisition module, a control module and an execution module installed in the RH furnace turbid water circulation system; The signal acquisition module includes an RH furnace vacuum state sensor, a flow sensor, a pressure sensor and a temperature sensor; wherein the RH furnace vacuum state sensor is installed on the RH furnace and connected to the control module for collecting the vacuum operation signal of the RH furnace; a plurality of pressure sensors are provided, which are respectively installed on the turbid water supply pump outlet main pipe and the RH furnace inlet and connected to the control module; the pressure sensor on the turbid water supply pump outlet main pipe is used to collect the turbid water supply pump outlet water supply pressure, and the pressure sensor at the RH furnace inlet is used to collect the RH furnace supply pressure; the temperature sensor is installed on the turbid water supply pump outlet main pipe and connected to the control module for collecting the circulating water temperature; the flow sensor is installed on the turbid water supply pump outlet main pipe and connected to the control module for collecting the main pipe flow; The control module is used to receive the sensor signal transmitted by the signal acquisition module, determine the current production stage of the RH furnace, and output corresponding control instructions according to the production stage; The execution module includes a pneumatic control valve and a variable frequency speed regulator; wherein the pneumatic control valve is installed on the RH furnace dirty water branch pipe, and is used to receive the control instructions of the control module, and adjust the opening of the pneumatic control valve according to the control instructions, thereby controlling the flow rate on the terminal water side; the variable frequency speed regulator is installed on the dirty water supply pump, and is used to receive the instructions of the control module, and adjust the speed of the dirty water supply pump according to the instructions to ensure the pressure requirement set for the RH furnace dirty water branch pipe.

2. The RH furnace turbid water circulating water automatic regulating system according to claim 1 is characterized in that: The RH furnace control system provides a signal to determine whether the current production stage of the RH furnace is the non-vacuum stage, the pre-vacuum stage, or the formal vacuum stage.

3. The RH furnace turbid water circulating water automatic regulating system according to claim 1 is characterized in that: When the RH furnace is in the non-vacuum stage, the control module sends an instruction to the pneumatic control valve to reduce the opening to 10-30%; at the same time, the control module uses the PID control algorithm model to perform calculations and sends a frequency reduction adjustment instruction to the variable frequency speed regulator. The pressure of the turbid water supply pump outlet main pipe and the pressure of the RH furnace turbid water branch pipe are collected through the pressure sensor, so that the pressure of the RH furnace turbid water branch pipe is stabilized at the set value P.

4. The RH furnace turbid water circulating water automatic regulating system according to claim 1 is characterized in that: When the RH furnace is in the pre-vacuum stage, the control module sends an instruction to the pneumatic control valve to increase the opening to 60-70%; at the same time, the control module uses the PID control algorithm model to perform calculations and sends a frequency increase adjustment instruction to the variable frequency speed regulator. The pressure of the turbid water supply pump outlet main pipe and the pressure of the RH furnace turbid water branch pipe are collected through the pressure sensor, so that the pressure of the RH furnace turbid water branch pipe is stabilized at the set value P.

5. The RH furnace turbid water circulating water automatic regulating system according to claim 1 is characterized in that: When the RH furnace is in the formal vacuum stage, the control module sends an instruction to the pneumatic control valve to increase the opening to 100%; at the same time, the control module uses the PID control algorithm model to perform calculations and sends a frequency increase adjustment instruction to the variable frequency speed regulator. The pressure of the turbid water supply pump outlet main pipe and the pressure of the RH furnace turbid water branch pipe are collected through the pressure sensor, so that the pressure of the RH furnace turbid water branch pipe is stabilized at the set value P.

6. The RH furnace turbid water circulating water automatic regulating system according to claim 5 is characterized in that: The set value P is 0.45MPa.

7. The RH furnace turbid water circulating water automatic regulating system according to any one of claims 1 to 6, characterized in that: The RH furnace dirty water circulation system includes a cooling tower, a dirty water well, a dirty water supply pump, a self-cleaning filter, a pressure, flow, and temperature gauge, an RH furnace, a water collection tank, and a return water pump. The cooling tower is located above the dirty water well. The dirty water well is connected to several sets of dirty water supply pumps, which are in turn connected to the self-cleaning filters. The self-cleaning filters are connected to one or more sets of RH furnace dirty water branch pipes via the dirty water supply pump outlet manifold. The dirty water supply pump outlet manifold is equipped with a pressure, flow, and temperature gauge to display the pressure, flow, and temperature on the water supply side. The other ends of the RH furnace dirty water branch pipes are connected to the RH furnace spray pipes. The RH furnace spray pipes are located above the water collection tank, and the water collection tank outlet is connected to the cooling tower via the return water pump, completing the RH furnace dirty water circulation.

8. The RH furnace turbid water circulating water automatic regulating system according to claim 1 is characterized in that: The control module includes a central controller PLC.

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