Furnace top pressure equalizing control system

Abstract

The utility model discloses a furnace top pressure equalizing control system. A charging bucket is connected with a feeding system through a charging bucket valve plate; the upper part of the valve box is connected with the charging bucket through the valve box valve plate; the lower part of the valve box is connected with the blast furnace distributor; the first pressure sensor is configured to measure the pressure in the charging bucket; the second pressure sensor is configured to measure the pressure in the valve box; the first differential pressure sensor is configured to measure a differential pressure; the gas inlet system is connected with the material tank and is configured to convey nitrogen; a flow detection assembly, a flow regulating valve, a hydraulic control valve and a valve assembly are arranged on an air supply pipeline of the air inlet system; the flow detection assembly comprises a flow meter and a flow orifice plate and is configured to detect and stabilize the flow of nitrogen; the flow regulating valve is configured to regulate the pressure balance between the charging bucket and the valve box; the hydraulic control valve is configured to control on-off of nitrogen in the gas inlet system. The problem of how to maintain the balance between the charging bucket and the blast furnace pressure so as to guarantee the stability and high efficiency of blast furnace ironmaking production is solved.

Description

Technical Field

[0001] This application relates to the field of blast furnace ironmaking technology, and in particular to a furnace top pressure equalization control system. Background Technology

[0002] In the blast furnace ironmaking process, the charging stage is crucial. This stage requires pre-placing the furnace charge in a charging hopper, and then precisely distributing the ore into the blast furnace through the hopper. However, the blast furnace interior is a complex and unique environment, filled with gases such as coal gas and hot blast, and is a high-temperature, pressurized, sealed space. Under these conditions, any pressure imbalance between the charging hopper and the blast furnace will severely negatively impact the charging process, thereby interfering with normal blast furnace production and reducing production efficiency and product quality.

[0003] Existing technologies have low pressure equalization accuracy, making it difficult to precisely control the pressure of the material tank and blast furnace within the ideal range. They also have poor pressure equalization stability, large pressure fluctuations, which affect the uniformity and accuracy of material distribution. Furthermore, the gas flow control is inaccurate, resulting in a large amount of nitrogen waste.

[0004] However, how to maintain the balance between the charging tank and the blast furnace pressure to ensure the stability and efficiency of blast furnace ironmaking production has become an urgent problem to be solved in the blast furnace ironmaking charging process. Utility Model Content

[0005] This application provides a furnace top pressure equalization control system, which solves the problem of how to maintain the pressure balance between the charging hopper and the blast furnace to ensure the stability and efficiency of blast furnace ironmaking production.

[0006] This application provides a furnace top pressure equalization control system, including a charging hopper, a charging hopper valve plate, a valve box, a sensor assembly, a valve box valve plate, a control system, and an air intake system. The charging hopper is connected to a charging system via the charging hopper valve plate, and the charging system feeds furnace charge into the charging hopper through the charging hopper valve plate. The upper part of the valve box is connected to the charging hopper via the valve box valve plate, and the lower part of the valve box is connected to the blast furnace distributor. The sensor assembly includes a first pressure sensor, a second pressure sensor, and a first differential pressure sensor. One end of the first pressure sensor is connected to the charging hopper, and the other end is connected to the control system, and it is configured to measure the pressure inside the charging hopper. One end of the second pressure sensor is connected to the valve box, and the other end is connected to the control system, and it is configured to measure... The pressure inside the valve box is measured; one end of the first differential pressure sensor is connected to the first pressure sensor, and the other end is connected to the second pressure sensor, configured to measure the pressure difference between the pressure inside the tank measured by the first pressure sensor and the pressure inside the valve box measured by the second pressure sensor; the air intake system is connected to the tank and configured to deliver nitrogen; the air supply pipeline of the air intake system is equipped with a flow detection component, a flow regulating valve, a hydraulic valve, and a valve assembly; the flow detection component includes a flow meter and a flow orifice plate, configured to detect and stabilize the flow rate of nitrogen; the flow regulating valve is configured to adjust the pressure balance between the tank and the valve box; the hydraulic valve is configured to control the on / off of nitrogen in the air intake system.

[0007] In one possible implementation, a valve assembly is installed on the air supply pipe of the air intake system, including a first butterfly valve, a pressure reducing valve, a third pressure sensor, a second butterfly valve, a third butterfly valve, a fourth butterfly valve, a check valve, and a fifth butterfly valve; the first butterfly valve is installed at the inlet of the air supply pipe; the pressure reducing valve is installed at the inlet of the air supply pipe and is located after the first butterfly valve; the third pressure sensor is located between the pressure reducing valve and the flow meter; the second and third butterfly valves are respectively installed on both sides of the flow regulating valve; the fourth butterfly valve is installed on the pipe connected in parallel with the flow regulating valve; the check valve is installed on the side of the air supply pipe near the material tank; and the fifth butterfly valve is installed between the check valve and the material tank.

[0008] In one possible implementation, a temperature sensor is also included; the temperature sensor is connected to the gas supply pipe and is located in the middle of the gas supply pipe connection.

[0009] In one possible implementation, the sensor assembly further includes a second differential pressure sensor; one end of the second differential pressure sensor is connected to the first pressure sensor, and the other end is connected to the second pressure sensor, and is configured to measure the pressure difference between the pressure in the tank measured by the first pressure sensor and the pressure in the valve box measured by the second pressure sensor when the first differential pressure sensor fails.

[0010] One or more technical solutions provided in this application have at least the following technical effects or advantages: The material tank of this application is connected to the charging system via a material tank valve plate, and the charging system feeds the furnace charge into the material tank through the material tank valve plate. The upper part of the valve box is connected to the material tank via a valve box valve plate, and the lower part of the valve box is connected to the blast furnace distributor. The sensor assembly includes a first pressure sensor, a second pressure sensor, and a first differential pressure sensor. One end of the first pressure sensor is connected to the material tank, and the other end is connected to the control system, configured to measure the pressure inside the material tank. One end of the second pressure sensor is connected to the valve box, and the other end is connected to the control system, configured to measure the pressure inside the valve box. One end of the first differential pressure sensor is connected to the first pressure sensor, and the other end is connected to the second pressure sensor, configured to measure the pressure difference between the pressure inside the material tank measured by the first pressure sensor and the pressure inside the valve box measured by the second pressure sensor. The gas inlet system is connected to the material tank and configured to supply nitrogen. The gas supply pipeline of the gas inlet system is equipped with a flow detection assembly, a flow regulating valve, a hydraulic control valve, and a valve assembly. The flow detection component, including a flow meter and a flow orifice plate, is configured to detect and stabilize the nitrogen flow rate. A flow regulating valve is configured to adjust the pressure balance between the feed tank and the valve box. A hydraulically controlled valve is configured to control the flow of nitrogen in the intake system. Based on the pressure difference between the pressure in the feed tank measured by the first pressure sensor and the pressure in the valve box measured by the second pressure sensor, the control system can precisely adjust the opening of the flow regulating valve, quickly and stably achieving pressure balance between the feed tank and the valve box, effectively avoiding uneven and inaccurate material distribution caused by pressure imbalance. The flow detection component and flow regulating valve installed on the gas supply pipeline of the intake system enable precise detection and control of the nitrogen flow rate, effectively reducing nitrogen waste. This solves the problem of maintaining pressure balance between the feed tank and the blast furnace to ensure stable and efficient blast furnace ironmaking production. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments of this utility model or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of a furnace top pressure equalization control system provided in an embodiment of this application.

[0013] Reference numerals: 1-Tank; 2-Tank valve plate; 3-Valve box; 4-Sensor assembly; 41-First pressure sensor; 42-Second pressure sensor; 43-First differential pressure sensor; 44-Second differential pressure sensor; 5-Valve box valve plate; 6-Control system; 7-Inlet system; 71-Flow detection assembly; 711-Flow meter; 712-Flow orifice plate; 72-Flow regulating valve; 73-Hydraulic valve; 74-Valve assembly; 741-First butterfly valve; 742-Pressure reducing valve; 743-Third pressure sensor; 744-Second butterfly valve; 745-Third butterfly valve; 746-Fourth butterfly valve; 747-Check valve; 748-Fifth butterfly valve; 8-Temperature sensor. Detailed Implementation

[0014] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0016] Figure 1 This is a schematic diagram of a furnace top pressure equalization control system provided in an embodiment of this application. Figure 1As shown, the furnace top pressure equalization control system includes a charging hopper 1, a charging hopper valve plate 2, a valve box 3, a sensor assembly 4, a valve box valve plate 5, a control system 6, and an air intake system 7. The charging hopper 1 is connected to the charging system via the charging hopper valve plate 2, and the charging system feeds furnace charge into the charging hopper 1 through the charging hopper valve plate 2. The upper part of the valve box 3 is connected to the charging hopper 1 via the valve box valve plate 5, and the lower part of the valve box 3 is connected to the blast furnace distributor. The sensor assembly 4 includes a first pressure sensor 41, a second pressure sensor 42, and a first differential pressure sensor 43. One end of the first pressure sensor 41 is connected to the charging hopper 1, and the other end is connected to the control system 6; it is configured to measure the pressure inside the charging hopper 1. One end of the second pressure sensor 42 is connected to the valve box 3, and the other end is connected to the control system 6; it is configured to measure the pressure inside the valve box 3. One end of the first differential pressure sensor 43 is connected to the first pressure sensor 41, and the other end is connected to the second pressure sensor 42. It is configured to measure the pressure difference between the pressure measured by the first pressure sensor 41 in the material tank 1 and the pressure measured by the second pressure sensor 42 in the valve box 3. The air intake system 7 is connected to the material tank 1 and is configured to supply nitrogen. The air supply pipe of the air intake system 7 is equipped with a flow detection component 71, a flow regulating valve 72, a hydraulically controlled valve 73, and a valve assembly 74. The flow detection component 71 includes a flow meter 711 and a flow orifice plate 712, and is configured to detect and stabilize the nitrogen flow rate. The flow regulating valve 72 is configured to adjust the pressure balance between the material tank 1 and the valve box 3. The hydraulically controlled valve 73 is configured to control the flow of nitrogen in the air intake system 7.

[0017] When the control system 6 controls the opening of the hopper valve plate 2 and the closing of the valve box valve plate 5, the furnace charge enters the hopper 1 through the hopper valve plate 2 and is stored. After the hopper 1 is full of furnace charge, the control system 6 controls the hopper valve plate 2 to close, opens the hydraulic control valve 73 and the flow regulating valve 72 to equalize the pressure. Based on the data from the first differential pressure sensor 43, the first pressure sensor 41, and the second pressure sensor 42, the control system controls the flow rate of the flow regulating valve 72 to achieve pressure equalization in the hopper 1. After pressure equalization is completed, the hydraulic control valve 73 is closed. The control system 6 then opens the valve box valve plate 5, allowing the furnace charge in the hopper 1 to enter the blast furnace distributor through the valve box 3 for distribution. After distribution is completed, the control box valve plate 5 is closed, disconnecting the hopper 1 from the valve box 3.

[0018] Specifically, the normal operation of the furnace top pressure equalization control system can be divided into three stages: charging, pressure equalization, and material distribution. During the charging stage, when it is necessary to replenish the furnace charge hopper 1 to maintain continuous blast furnace ironmaking production, the control system 6 issues a command to open the charge hopper valve 2 while ensuring that the valve box valve 5 is closed. At this time, the charging system begins operation, feeding the furnace charge into the charge hopper 1. Under the influence of gravity, the furnace charge passes through the opened valve 2 and enters the charge hopper 1 for storage. During this process, the control system 6 continuously monitors the status of the charge hopper 1 to ensure a smooth and orderly charging process without leakage or other abnormalities. When the amount of furnace charge in the charge hopper 1 reaches the predetermined storage limit, the control system 6 controls the valve 2 to close, isolating the charge hopper 1 from the charging system and preparing for subsequent pressure equalization operations. After the charge hopper 1 is full, the system enters the pressure equalization shutdown stage. The control system 6 controls the valve 2 to close, ensuring that the charge hopper 1 is in a relatively closed state to prevent accidental leakage of furnace charge or interference from external gases during subsequent operations. Control system 6 opens hydraulic valve 73 and flow regulating valve 72, at which point air intake system 7 begins to supply nitrogen into tank 1. Throughout the pressure equalization process, the first differential pressure sensor 43, the first pressure sensor 41, and the second pressure sensor 42 monitor the pressure changes in tank 1 and valve box 3. The first pressure sensor 41 transmits the pressure data in tank 1 to control system 6 in real time, while the second pressure sensor 42 synchronously feeds back the pressure data in valve box 3. The first differential pressure sensor 43 further transmits the pressure difference between tank 1 and valve box 3. Control system 6 analyzes and processes this real-time data. Based on this data, control system 6 dynamically adjusts the flow rate of flow regulating valve 72. If the pressure difference is large, control system 6 will appropriately increase the opening of flow regulating valve 72 to accelerate the nitrogen delivery speed and more quickly balance the pressure between tank 1 and valve box 3. If the pressure difference gradually decreases, control system 6 will correspondingly decrease the opening of flow regulating valve 72 to prevent excessive nitrogen delivery and pressure imbalance. Through this precise control, the pressure inside the hopper 1 and the valve box 3 is ultimately balanced, ensuring the entire system operates in a stable and safe state. After the pressure equalization operation is completed, the control system 6 promptly closes the hydraulic valve 73, stopping the nitrogen supply and preparing for the subsequent charging operation. After the pressure equalization operation, the system enters the charging stage. The control system 6 issues another command to open the valve plate 5 of the valve box. At this time, the furnace charge in the hopper 1, under the influence of gravity, passes through the opened valve plate 5 and enters the valve box 3. The valve box 3 then transports the furnace charge to the blast furnace charge distributor. During the charging stage, the control system 6 continuously monitors the charging status to ensure uniform and reasonable distribution of the furnace charge. After the charging operation is completed, the control system 6 promptly issues a command to close the valve plate 5 of the valve box, disconnecting the connection between the hopper 1 and the valve box 3 to prevent further leakage of furnace charge or the entry of external gases that could affect the production environment inside the blast furnace.At this point, a complete cycle of feeding, pressure equalization, and material distribution is completed, and the system enters the next round of work preparation.

[0019] The valve assembly 74 is installed on the air supply pipe of the air intake system 7 and includes a first butterfly valve 741, a pressure reducing valve 742, a third pressure sensor 743, a second butterfly valve 744, a third butterfly valve 745, a fourth butterfly valve 746, a check valve 747, and a fifth butterfly valve 748.

[0020] The first butterfly valve 741 is installed at the inlet of the gas supply pipeline. The first butterfly valve 741 is used to cut off the gas source, so that when it is necessary to perform maintenance or other operations on the gas source, the intake system 7 can be quickly and effectively isolated from the external gas source, ensuring the safe conduct of maintenance work.

[0021] The pressure reducing valve 742 is installed at the inlet of the gas supply pipeline, downstream of the first butterfly valve 741. The pressure reducing valve 742 is used to reduce the gas source pressure, typically set at 0.2-0.5 MPa. By reducing the pressure, the impact of pressure surges on the subsequent pressure equalization process can be minimized, ensuring the stability and reliability of the air intake system 7 and the pressure equalization process, and preventing damage to the equipment or impact on the pressure equalization effect due to excessive pressure or large pressure fluctuations.

[0022] The third pressure sensor 743 is located between the pressure reducing valve 742 and the flow meter 711. The third pressure sensor 743 is used to detect the nitrogen pressure at this location in real time. The third pressure sensor 743 transmits the detected pressure data to the control system 6. The control system 6 can monitor and analyze the pressure status of the intake system 7 based on this data, so as to adjust the relevant parameters in a timely manner and ensure that the intake system 7 operates within a suitable pressure range.

[0023] The second butterfly valve 744 and the third butterfly valve 745 are installed on both sides of the flow control valve 72, respectively. The fourth butterfly valve 746 is installed on the pipeline connected in parallel with the flow control valve 72. When the flow control valve 72 needs maintenance, the fourth butterfly valve 746 is opened, and the second butterfly valve 744 and the third butterfly valve 745 are closed for maintenance and replacement.

[0024] Specifically, closing the second butterfly valve 744 and the third butterfly valve 745 can disconnect the flow regulating valve 72 from other parts of the gas supply pipeline, enabling online maintenance and replacement of the flow regulating valve 72 without stopping the operation of the entire air intake system 7, thus improving maintenance efficiency and system availability.

[0025] Check valve 747 is installed on the side of the gas supply pipeline near the material tank 1. The function of check valve 747 is to prevent blast furnace gas from leaking out in case of a malfunction. When the gas intake system 7 experiences abnormal conditions, such as a sudden drop in pressure or other malfunctions, check valve 747 can automatically close, preventing blast furnace gas from flowing back into the gas intake system 7, avoiding safety accidents, and ensuring the safety of equipment and personnel.

[0026] The fifth butterfly valve 748 is installed between the check valve 747 and the material tank 1. The fifth butterfly valve 748 is used to disconnect the gas supply system from the material tank 1, facilitating maintenance of the material tank 1. When maintenance, cleaning, or inspection of the material tank 1 is required, closing the fifth butterfly valve 748 ensures the safe conduct of the maintenance work.

[0027] This application also includes a temperature sensor 8. The temperature sensor 8 is connected to the gas supply pipeline and is located in the middle of the gas supply pipeline connection. The temperature sensor 8 is used to measure the temperature of nitrogen in the gas supply pipeline in real time.

[0028] Furthermore, the sensor assembly 4 also includes a second differential pressure sensor 44. One end of the second differential pressure sensor 44 is connected to the first pressure sensor 41, and the other end is connected to the second pressure sensor 42. It is configured to measure the pressure difference between the pressure in the material tank 1 measured by the first pressure sensor 41 and the pressure in the valve box 3 measured by the second pressure sensor 42 when the first differential pressure sensor 43 fails.

[0029] Specifically, by setting a second differential pressure sensor 44 as a backup differential pressure sensor, the reliability and safety of the furnace top pressure equalization control system 6 are improved, and the loss of control of the pressure equalization process due to the failure of the first differential pressure sensor 43 is avoided, which would affect the normal operation of blast furnace ironmaking.

[0030] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0031] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A furnace top pressure equalization control system, characterized in that, It includes a material tank (1), a material tank valve plate (2), a valve box (3), a sensor assembly (4), a valve box valve plate (5), a control system (6), and an air intake system (7); The material tank (1) is connected to the feeding system through the material tank valve plate (2), and the feeding system feeds the furnace material into the material tank (1) through the material tank valve plate (2); The upper part of the valve box (3) is connected to the material tank (1) through the valve plate (5), and the lower part of the valve box (3) is connected to the blast furnace feeder. The sensor assembly (4) includes a first pressure sensor (41), a second pressure sensor (42), and a first differential pressure sensor (43); One end of the first pressure sensor (41) is connected to the material tank (1), and the other end is connected to the control system (6). It is configured to measure the pressure inside the material tank (1). One end of the second pressure sensor (42) is connected to the valve box (3), and the other end is connected to the control system (6). It is configured to measure the pressure inside the valve box (3). One end of the first differential pressure sensor (43) is connected to the first pressure sensor (41), and the other end is connected to the second pressure sensor (42). It is configured to measure the pressure difference between the pressure in the material tank (1) measured by the first pressure sensor (41) and the pressure in the valve box (3) measured by the second pressure sensor (42). The air intake system (7) is connected to the material tank (1) and is configured to deliver nitrogen; The air supply pipe of the air intake system (7) is equipped with a flow detection component (71), a flow regulating valve (72), a hydraulic control valve (73) and a valve assembly (74); The flow detection assembly (71) includes a flow meter (711) and a flow orifice plate (712), and is configured to detect and stabilize the flow rate of nitrogen. The flow regulating valve (72) is configured to adjust the pressure balance between the material tank (1) and the valve box (3); The hydraulic valve (73) is configured to control the flow of nitrogen in the intake system (7).

2. The furnace top pressure equalization control system according to claim 1, characterized in that, The valve assembly (74) is installed on the air supply pipe of the air intake system (7) and includes a first butterfly valve (741), a pressure reducing valve (742), a third pressure sensor (743), a second butterfly valve (744), a third butterfly valve (745), a fourth butterfly valve (746), a check valve (747) and a fifth butterfly valve (748); The first butterfly valve (741) is installed at the inlet of the gas supply pipeline; The pressure reducing valve (742) is installed at the inlet of the gas supply pipeline and is located after the first butterfly valve (741); The third pressure sensor (743) is located between the pressure reducing valve (742) and the flow meter (711); The second butterfly valve (744) and the third butterfly valve (745) are respectively installed on both sides of the flow regulating valve (72); The fourth butterfly valve (746) is installed on the pipeline in parallel with the flow regulating valve (72); A check valve (747) is installed on the side of the gas supply pipeline near the material tank (1); The fifth butterfly valve (748) is installed between the check valve (747) and the material tank (1).

3. The furnace top pressure equalization control system according to claim 1, characterized in that, It also includes a temperature sensor (8); The temperature sensor (8) is connected to the gas supply pipe and is located in the middle of the gas supply pipe connection.

4. The furnace top pressure equalization control system according to claim 3, characterized in that, The sensor assembly (4) also includes a second differential pressure sensor (44); One end of the second differential pressure sensor (44) is connected to the first pressure sensor (41), and the other end is connected to the second pressure sensor (42). It is configured to measure the pressure difference between the pressure in the tank (1) measured by the first pressure sensor (41) and the pressure in the valve box (3) measured by the second pressure sensor (42) when the first differential pressure sensor (43) fails.

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