Converter trunnion ring double-path circulating cooling system and control method thereof

Abstract

This invention discloses a dual-circuit cooling system for converter rings and its control method, relating to the field of metallurgical equipment cooling technology. The dual-circuit cooling system includes a dual-path independent water supply network, comprising a dedicated line to the furnace mouth, a dedicated line to the furnace chamber, and a dynamic balancing valve group. The control method for the dual-circuit cooling system specifically includes the following steps: the furnace mouth loop uses ambient temperature water, with the water temperature ≤35℃, to achieve rapid cooling of the high heat load area; simultaneously, the furnace chamber loop uses a heat exchanger for pre-cooling, with the pre-cooling temperature ≤60℃, to prevent high-temperature return water from impacting the rings. This invention utilizes existing pipe supports to lay new pipelines, achieving zero additional land occupation. Furthermore, the high-temperature return water from the furnace mouth does not flow through the furnace chamber, reducing the system heat load by 40%, resulting in better thermodynamic optimization. Through dual-path independent metering and closed-loop control, the inlet flow rate of the rings is stabilized at 50±2 m³ / h, achieving precise flow rate regulation.

Description

Technical Field

[0001] This invention relates to the field of metallurgical equipment cooling technology, specifically a converter support ring dual-circuit cooling system and its control method. Background Technology

[0002] The converter support ring is a key load-bearing and transmission component in converter steelmaking equipment. Its core function is to support the entire weight of the converter body and transmit tilting torque, enabling the furnace body to rotate 360° forward and backward according to process requirements to complete operations such as charging, blowing, and tapping.

[0003] Traditional converter support rings use a single-path series water supply mode (furnace inlet → furnace → support ring), and the resistance in the high-temperature furnace section is too large, resulting in a support ring inlet flow rate of only 15m³ / h. The support ring is prone to overheating and deformation over a long period of time, which easily leads to hydraulic imbalance. In addition, the return water from the furnace inlet is heated to above 80°C after secondary heating in the furnace, which easily weakens the cooling effect of the support ring. Furthermore, the existing improvement solutions only increase the power of the water pump, without solving the structural defects of the system, and at the same time, the energy consumption increases by 30%, resulting in low thermal efficiency and thus reducing the utilization rate to a certain extent. Summary of the Invention

[0004] The purpose of this invention is to provide a dual-circulation cooling system for converter support rings and its control method to solve the problem of insufficient water flow in the support rings caused by uneven cooling between the converter mouth and the furnace area.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a converter ring dual-circuit cooling system and its control method, comprising a converter ring body, wherein the converter ring dual-circuit cooling system comprises a dual-path independent water supply network, wherein the dual-path independent water supply network comprises a furnace mouth dedicated line, a furnace chamber dedicated line and a dynamic balancing valve group;

[0006] The control method for the dual-path circulating cooling of the converter ring specifically includes the following steps:

[0007] Step 1: The furnace inlet circuit uses room temperature water, and the temperature of the water is ≤35℃ to achieve rapid cooling of the high heat load area. At the same time, the furnace circuit uses a heat exchanger for pre-cooling, and the pre-cooling temperature is ≤60℃ to avoid high temperature return water impacting the support ring, thus realizing a source-based temperature control strategy.

[0008] Step 2: Adjust the valve group opening in real time through the pressure sensor to maintain the pressure difference between the two channels ≤0.2MPa, thereby setting and controlling the pressure difference compensation mechanism;

[0009] The top and bottom of one side of the converter support ring body are provided with internal threads. The top and bottom of both sides of the converter support ring body are provided with internal pressing members extending to the top and bottom of the converter support ring body. The end of the internal pressing member near the converter support ring body is rotatably connected to a screw through a bearing. The other end of the internal pressing member near the converter support ring body is fixed with a limiting rod extending to the outside of the converter support ring body.

[0010] As a further embodiment of the present invention: limit holes are provided at the top and bottom of the other end of both sides of the converter support ring body, and the limit rod is movably connected to the converter support ring body through the limit holes.

[0011] As a further aspect of the present invention: all the inner pressing members are arc-shaped, and the outer diameter of each inner pressing member is smaller than the inner diameter of the converter support ring body and is movably connected to the converter support ring body.

[0012] As a further aspect of the present invention: the furnace mouth dedicated line is a newly added DN150 water supply pipe directly connected to the furnace mouth cooling ring, and the connected return water pipe bypasses the furnace chamber and goes directly to the water inlet of the support ring.

[0013] As a further aspect of the present invention: the furnace dedicated line is to transform the original water supply pipe into a dedicated furnace circuit, and the return water is injected into the support ring after being cooled by the furnace cap.

[0014] As a further aspect of the present invention: the dynamic balancing valve group is equipped with a proportional regulating valve at the confluence of the two return water lines, and the flow rates at the furnace inlet and furnace chamber are distributed in a 5:3 ratio.

[0015] As a further aspect of the present invention, the temperature of the high-temperature return water at the furnace opening is controlled between 120°C and 80°C.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. By using the original pipe supports to lay new pipes, zero new land occupation is achieved, thereby reducing the footprint. In addition, the high-temperature return water at the furnace mouth does not flow through the furnace, thereby reducing the system heat load by 40% and making its thermodynamic optimization better. Furthermore, through dual independent metering and closed-loop control, the inlet flow rate of the support ring is stabilized at 50±2m³ / h, thus achieving precise flow control.

[0018] 2. By rotating the screw with the bearing as the base point, the screw can be threaded along the threaded hole, thereby generating opposing extrusion forces on the inner pressing parts located inside the converter support ring body. This improves the outer diameter of the annular structure formed by two adjacent sets of inner pressing parts, making it easier to extend the inner pressing parts into the converter. Then, by rotating the screw in the opposite direction, the outer wall of the inner pressing part is firmly pressed against the inner wall of the converter, while the converter support ring body is located outside the converter connection end. Thus, the converter support ring body and the converter have both internal and external pressure during the connection process, thereby ensuring the stability of the connection. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the dual-path cooling system of the present invention;

[0020] Figure 2 This is the control logic diagram of the present invention;

[0021] Figure 3 This is a perspective view of the converter support ring body of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the present invention;

[0023] Figure 5 This is a perspective view of the inner pressing component of the present invention.

[0024] In the diagram: 1. Converter support ring body; 101. Threaded hole; 2. Inner pressing part; 201. Bearing; 202. Screw; 203. Limiting rod. Detailed Implementation

[0025] 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.

[0026] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and 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, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" 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; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0027] Please see Figures 1-5 In this embodiment of the invention, a converter ring dual-circulation cooling system and its control method are disclosed. The converter ring dual-circulation cooling system includes a dual-independent water supply network, wherein the dual-independent water supply network includes a furnace mouth line, a furnace chamber line and a dynamic balancing valve group.

[0028] The control method for dual-circuit cooling of the converter support ring specifically includes the following steps:

[0029] Step 1: The furnace inlet circuit uses room temperature water, and the temperature of the water is ≤35℃ to achieve rapid cooling of the high heat load area. At the same time, the furnace circuit uses a heat exchanger for pre-cooling, and the pre-cooling temperature is ≤60℃ to avoid high temperature return water impacting the support ring, thus realizing a source-based temperature control strategy.

[0030] Step 2: Adjust the valve group opening in real time through the pressure sensor to maintain the pressure difference between the two channels ≤0.2MPa, thereby setting and controlling the pressure difference compensation mechanism;

[0031] The top and bottom of one side of the converter support ring body 1 are provided with internal threads. The top and bottom of both sides of the converter support ring body 1 are provided with internal pressing parts 2 extending to the top and bottom of the converter support ring body 1. The end of the internal pressing part 2 near the converter support ring body 1 is rotatably connected to the screw 202 through the bearing 201. The other end of the internal pressing part 2 near the converter support ring body 1 is fixed with the limiting rod 203 extending to the outside of the converter support ring body 1.

[0032] In this embodiment, the specific implementation includes the following steps:

[0033] Step 1 involves cutting the original furnace inlet return water pipe and adding a 304 stainless steel seamless pipe (Φ159×6mm) directly connected to the water inlet flange of the support ring. At the same time, the original furnace circuit is retained, a plate heat exchanger is installed at the furnace cap outlet (the temperature drop is controlled within 120℃→60℃), and an electric proportional valve (DN200 diameter, adjustment accuracy ±5%) is installed in the manifold section to realize the system transformation.

[0034] Step 2, initial settings include a furnace inlet circuit flow rate of 30 m³ / h and a furnace circuit flow rate of 20 m³ / h. When the differential pressure exceeds the limit (>0.2 MPa), the valve opening of the high resistance circuit is automatically reduced (step value is 1% / s), and the main water supply circuit is switched every 8 hours to prevent local scaling.

[0035] Step 3: The inlet water temperature of the support ring is reduced from 50℃ to 42℃, the flow rate is increased from 15m³ / h to 50.3m³ / h, and the surface temperature difference of the support ring is reduced from 50℃ to 42℃, resulting in a reduction in annual deformation. This is used to verify the data and ensure its accuracy and the stability of the system.

[0036] Please refer to this carefully. Figures 1 to 5 As a further embodiment of the present invention: limit holes are provided at the top and bottom of the other end of both sides of the converter support ring body 1, and the limit rod 203 is movably connected to the converter support ring body 1 through the limit holes.

[0037] Please refer to this carefully. Figures 1 to 5 The inner pressing parts 2 are all arc-shaped, and the outer diameter of the inner pressing parts 2 is smaller than the inner diameter of the converter support ring body 1 and is movably connected to the converter support ring body 1.

[0038] Please refer to this carefully. Figures 1 to 5 The dedicated water supply line to the furnace inlet is a newly added DN150 water supply pipe directly connected to the furnace inlet cooling ring, and the connected return water pipe bypasses the furnace chamber and goes directly to the water inlet of the support ring. See the attached document for details. Figure 1 The furnace opening is directly connected to the pipe ①.

[0039] Please refer to this carefully. Figures 1 to 5 The dedicated furnace line involves converting the original water supply pipe into a dedicated furnace circuit. Return water is cooled by the furnace cap before being injected into the support ring. See the appendix for details. Figure 1 The furnace circuit ② in the furnace.

[0040] Please refer to this carefully. Figures 1 to 5 The dynamic balancing valve group is a proportional regulating valve installed at the confluence of the two return water lines, and the flow rates at the furnace inlet and furnace chamber are distributed in a 5:3 ratio.

[0041] Please refer to this carefully. Figures 1 to 5 The temperature of the high-temperature return water at the furnace opening is controlled between 120℃ and 80℃, ensuring that the high-temperature return water does not flow through the furnace chamber, thereby reducing the system's heat load by 40% and thus improving its service life.

[0042] The working principle of this invention is as follows: When in use, the screw 202 is rotated with the bearing as the base point, so that the screw 202 can be threaded along the threaded hole 101, thereby generating opposing extrusion forces on the inner pressing member 2 located inside the converter support ring body 1, thereby improving the outer diameter of the annular structure formed by the two adjacent sets of inner pressing members 2, thus making it easier to extend the inner pressing member 2 into the interior of the converter. Then, the screw 202 is rotated in the opposite direction, so that the outer wall of the inner pressing member 2 is firmly pressed against the inner wall of the converter, while the converter support ring body 1 is located outside the converter connection end. Thus, the converter support ring body 1 and the converter have both internal and external pressure during the connection process, thereby ensuring the stability of the connection.

[0043] Meanwhile, a limiting rod 203 extending to the outside of the converter support ring body 1 is provided on the side of the inner pressing part 2, so that the limiting rod 203 also moves along the converter support ring body 1 during the process of the inner pressing part 2 moving under force, thereby improving the stability of the movement of the inner pressing part 2 and thus improving the utilization rate.

[0044] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dual-circuit cooling system for a converter support ring and its control method, comprising a converter support ring body (1), characterized in that, The converter support ring dual-circulation cooling system includes a dual-independent water supply network, which includes a furnace mouth dedicated line, a furnace chamber dedicated line and a dynamic balancing valve group. The control method for the dual-path circulating cooling of the converter ring specifically includes the following steps: Step 1: The furnace inlet circuit uses room temperature water, and the temperature of the water is ≤35℃ to achieve rapid cooling of the high heat load area. At the same time, the furnace circuit uses a heat exchanger for pre-cooling, and the pre-cooling temperature is ≤60℃ to avoid high temperature return water impacting the support ring, thus realizing a source-based temperature control strategy. Step 2: Adjust the valve group opening in real time through the pressure sensor to maintain the pressure difference between the two channels ≤0.2MPa, thereby setting and controlling the pressure difference compensation mechanism; The top and bottom of one side of the converter support ring body (1) are provided with internal threads. The top and bottom of both sides of the converter support ring body (1) are provided with internal pressing parts (2) extending to the top and bottom of the converter support ring body (1). The end of the internal pressing part (2) near the converter support ring body (1) is rotatably connected to a screw (202) through a bearing (201). The other end of the internal pressing part (2) near the converter support ring body (1) is fixed with a limiting rod (203) extending to the outside of the converter support ring body (1).

2. The converter support ring dual-circulation cooling system and its control method according to claim 1, characterized in that, Limiting holes are provided at the top and bottom of the other end of the converter support ring body (1) on both sides, and the limiting rod (203) is movably connected to the converter support ring body (1) through the limiting holes.

3. The converter support ring dual-circulation cooling system and its control method according to claim 1, characterized in that, The inner pressing parts (2) are all arc-shaped, and the outer diameter of the inner pressing parts (2) is smaller than the inner diameter of the converter support ring body (1) and is movably connected to the converter support ring body (1).

4. The converter support ring dual-circuit cooling system and its control method according to claim 1, characterized in that, The furnace mouth dedicated line is a newly added DN150 water supply pipe directly connected to the furnace mouth cooling ring, and the connected return water pipe bypasses the furnace and goes directly to the water inlet of the support ring.

5. The converter support ring dual-circulation cooling system and its control method according to claim 1, characterized in that, The furnace dedicated line is a circuit where the original water supply pipe is converted into a dedicated furnace circuit, and the return water is cooled by the furnace cap before being injected into the support ring.

6. The converter support ring dual-circuit cooling system and its control method according to claim 1, characterized in that, The dynamic balancing valve assembly consists of a proportional regulating valve installed at the confluence of the two return water lines, which distributes the flow rate at the furnace inlet to the furnace chamber at a ratio of 5:

3.

7. The converter support ring dual-circuit cooling system and its control method according to claim 1, characterized in that, The temperature of the high-temperature return water at the furnace opening is controlled between 120℃ and 80℃.

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