Blast furnace sealing valve seat, blast furnace sealing valve, blast furnace and control method

Abstract

The application discloses a blast furnace sealing valve seat, a blast furnace sealing valve, a blast furnace and a control method, and belongs to the technical field of blast furnace sealing devices. Steam leakage can be avoided, safety hazards can be eliminated, maintenance is facilitated, and continuous and stable production of the blast furnace is ensured. The blast furnace sealing valve seat comprises a valve seat body in the shape of a ring, a heating ring, a steam inlet pipe and a steam outlet pipe. The heating ring is connected to the inner wall of the valve seat body. A steam passage is arranged in the heating ring, and the heating ring is also provided with a steam inlet port and a steam outlet port which are in communication with the steam passage. The steam inlet pipe is in communication with the steam passage through the steam inlet port. The steam outlet pipe is in communication with the steam passage through the steam outlet port. The heating ring is in a non-closed loop structure, so as to form a one-way steam flow path from the steam inlet port to the steam outlet port.

Description

Technical Field

[0001] This application belongs to the technical field of blast furnace sealing devices, and particularly relates to a blast furnace sealing valve seat, a blast furnace sealing valve, a blast furnace and a control method. Background Technology

[0002] As a key component of the charging system, the sealing valve at the top of the blast furnace directly affects the safe operation and production efficiency of the blast furnace. However, during the production process, water-containing dust and gas condense on the valve seat surface, forming ash deposits that severely weaken the sealing effect.

[0003] The relevant technology uses built-in steam channels for heating and insulation, but this method has extremely high requirements for casting and welding processes. Even tiny pinholes or cracks can lead to steam leakage. The leaked steam mixes with the gas in the tank, posing a risk of cross-pressure and significant safety hazards, and may even cause an accident. Furthermore, the built-in heating channel and valve body are an integral structure, making maintenance and repair extremely difficult once blockage or leakage occurs. Usually, the entire valve seat or valve plate needs to be replaced, resulting in high maintenance costs and disruption to continuous blast furnace production. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems existing in the prior art. To this end, this application proposes a blast furnace sealing valve seat, a blast furnace sealing valve, a blast furnace, and a control method, which can prevent steam leakage, eliminate safety hazards, facilitate maintenance, and ensure the continuous and stable production of the blast furnace.

[0005] The first aspect of this application provides a blast furnace sealing valve seat, comprising: a valve seat body in the shape of an annulus; A heating ring is connected to the inner wall of the valve seat body; a steam passage is provided inside the heating ring, and the heating ring also has a steam inlet and a steam outlet communicating with the steam passage; The steam inlet pipe is connected to the steam passage through the steam inlet port; The steam outlet pipe is connected to the steam passage through the steam outlet. The heating ring is a non-closed-loop structure to form a unidirectional steam flow path from the steam inlet to the steam outlet.

[0006] In some embodiments, the heating ring includes a heating ring body and intermediate sections respectively provided at both ends along the circumferential direction; The two intermediate sections are respectively provided with steam inlets and steam outlets, and the openings of the steam inlets and / or the steam outlets face the blast furnace opening; along the steam flow direction, the cross-sectional area of ​​the intermediate section is smaller than the cross-sectional area of ​​the heating ring body.

[0007] In some embodiments, the heating ring body has extensions on both sides along the axial direction, and the extensions form a welded edge with the inner wall of the valve seat body to fix the heating ring to the valve seat body.

[0008] In some embodiments, the surface of the heating ring body is covered with a wear-resistant coating.

[0009] In some embodiments, the blast furnace sealing valve seat further includes: a temperature sensor disposed on the valve seat body, a flow valve disposed on the steam inlet pipe, and a controller, wherein the temperature sensor and the flow valve are electrically connected to the controller respectively; The temperature sensor is used to detect the real-time temperature of the valve seat body; the flow valve is used to control the steam flow rate; and the controller is used to adjust the valve position of the flow valve based on the real-time temperature detected by the temperature sensor.

[0010] In some embodiments, the blast furnace sealing valve seat further includes a pressure sensor electrically connected to the controller for detecting the pipeline pressure of the steam inlet pipe; The controller is also used to control the flow valve to open or close based on the pressure value detected by the pressure sensor.

[0011] A second aspect of this application provides a blast furnace sealing valve, comprising: a blast furnace sealing valve seat and a sealing valve plate provided in the first aspect embodiment, wherein the blast furnace sealing valve seat is located on the side of the sealing valve plate near the blast furnace opening.

[0012] A third aspect of this application provides a blast furnace, comprising: a blast furnace sealing valve provided in the second aspect embodiment and a receiving hopper disposed at the blast furnace inlet; the receiving hopper is connected to the blast furnace body via a receiving hopper flange; the receiving hopper flange is provided with a through hole, and the steam inlet pipe and the steam outlet pipe extend from the blast furnace body through the through hole.

[0013] In some embodiments, the receiving hopper includes: The receiving hopper body is conical, with a feed inlet at the upper end and a discharge outlet at the lower end along the direction of gravity; At least one buffer is disposed on the inner wall of the receiving body; the buffer has a receiving surface that is open toward the feed inlet.

[0014] In some embodiments, the receiving hopper further includes a plurality of irregularly shaped wear-resistant protective plates attached to the inner wall of the receiving hopper body, and at least some of the irregularly shaped wear-resistant protective plates are located between the buffer and the feed inlet and / or between the buffer and the discharge outlet.

[0015] A fourth aspect of this application provides a blast furnace sealing valve control method, applied to a blast furnace sealing valve of the second aspect. The blast furnace sealing valve includes a temperature sensor disposed on a valve seat body, a flow valve disposed on a steam inlet pipe, and a controller. The temperature sensor and the flow valve are electrically connected to the controller. The blast furnace sealing valve control method includes: The real-time temperature of the valve seat body detected by the temperature sensor is obtained. If the real-time temperature is less than the lower threshold, the flow valve is controlled to increase its opening. If the real-time temperature is greater than the upper limit threshold, the flow valve is controlled to reduce its opening.

[0016] The blast furnace sealing valve seat of this application designs the heating element as an independent, non-closed-loop heating ring connected to the inner wall of the valve seat body. On one hand, the heating ring and valve seat body are separate structures, allowing for separate manufacturing and assembly, significantly reducing the difficulty of casting and welding processes and effectively avoiding the risk of overall leakage due to micro-cracks or pinholes inside the valve seat body. On the other hand, the non-closed-loop structure ensures unidirectional steam flow, preventing steam stagnation or eddy currents within the ring, resulting in more uniform heat distribution and timely discharge of condensate, improving heating efficiency and safety. Even if the heating ring itself leaks, it only manifests as steam venting outwards, without mixing with the blast furnace gas in the confined space, thus eliminating potential hazards. Furthermore, the heating ring and valve seat body are not an integral structure; if blockage or leakage occurs, only the heating ring needs to be disassembled for repair, without replacing the entire valve seat or valve plate, thus facilitating maintenance and reducing costs. Simultaneously, it does not affect continuous blast furnace production, ensuring continuous and stable blast furnace operation. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic top view of a blast furnace sealing valve seat provided in one or more embodiments of this application; Figure 2 This is a schematic side view of a blast furnace sealing valve seat provided in one or more embodiments of this application. Figure 3 yes Figure 2 AA section view; Figure 4 yes Figure 2 BB section view; Figure 5 This is a schematic application scenario diagram of a blast furnace sealing valve seat provided in one or more embodiments of this application; Figure 6 yes Figure 5 Enlarged schematic diagram of region C; Figure 7 This is a schematic flowchart of a blast furnace sealing valve control method provided in one or more embodiments of this application. Detailed Implementation

[0018] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0019] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, the requirement defined by the phrase "comprising one..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element. The term "two or more" includes two or more cases.

[0020] The relevant technology uses built-in steam channels for heating and insulation, but this method has extremely high requirements for casting and welding processes. Even tiny pinholes or cracks can lead to steam leakage. The leaked steam mixes with the gas in the tank, posing a risk of cross-pressure and significant safety hazards, and may even cause an accident. Furthermore, the built-in heating channel and valve body are an integral structure, making maintenance and repair extremely difficult once blockage or leakage occurs. Usually, the entire valve seat or valve plate needs to be replaced, resulting in high maintenance costs and disruption to continuous blast furnace production.

[0021] In view of this, the embodiments of this application provide a blast furnace sealing valve seat, a blast furnace sealing valve and a blast furnace, which can prevent steam leakage, eliminate safety hazards, facilitate maintenance and ensure continuous and stable production of the blast furnace.

[0022] As attached Figure 1 As shown, the blast furnace sealing valve seat includes: a valve seat body 100 in the shape of an annular ring, a heating ring 200, a steam inlet pipe 300, and a steam outlet pipe 400. The heating ring 200 is connected to the inner wall of the valve seat body 100. A cavity is provided inside the heating ring 200 to form a steam passage 210.

[0023] Furthermore, the heating ring 200 is provided with a steam inlet 220 and a steam outlet 230 that communicate with the steam passage 210. The steam inlet pipe 300 is connected to the steam passage 210 through the steam inlet 220 and is used to introduce high-temperature steam into the heating ring 200. The steam outlet pipe 400 is connected to the steam passage 210 through the steam outlet 230 and is used to discharge the steam or condensate after heat exchange.

[0024] The heating ring 200 is constructed as a non-closed-loop structure. That is, the heating ring 200 is not a completely closed loop, but rather a ring with a break or where the starting and ending ends are not directly connected. Through this structure, a unique, unidirectional steam flow path is formed inside the heating ring 200, from the steam inlet 220 to the steam outlet 230 (e.g., Figure 2 (The direction of the dashed arrow is indicated).

[0025] Compared to the completely enclosed built-in channel in related technologies, this embodiment designs the heating element as an independent, non-closed-loop heating ring 200 connected to the inner wall of the valve seat body 100. On the one hand, the heating ring 200 and the valve seat body 100 are separate structures, which can be manufactured separately and then assembled, greatly reducing the difficulty of casting and welding processes and effectively avoiding the risk of overall leakage caused by micro-cracks or pinholes inside the valve seat body 100.

[0026] On the other hand, the non-closed-loop structure ensures unidirectional steam flow, preventing steam from stagnating or forming eddies within the ring, resulting in more uniform heat distribution and timely discharge of condensate, thus improving heating efficiency and safety. Even if the heating ring 200 itself leaks, it only manifests as steam venting outwards and will not mix with the gas inside the blast furnace in a confined space, significantly reducing the safety hazards of cross-pressure and explosion. Furthermore, the heating ring 200 and the valve seat body 100 are not an integral structure. If blockage or leakage occurs, only the heating ring 200 needs to be disassembled for maintenance, without the need to replace the entire valve seat or valve plate, thereby simplifying maintenance and reducing maintenance costs. At the same time, it will not affect the continuous production of the blast furnace, thus ensuring continuous and stable blast furnace production. In some embodiments, such as Figure 4 As shown, the heating ring body 200a has intermediate sections 200b at both ends along its circumferential direction (i.e., the two free ends of the non-closed-loop structure). Steam inlets 220 and steam outlets 230 are respectively provided on the two intermediate sections 200b. Furthermore, considering the installation environment of the blast furnace sealing valve seat, the opening direction of the steam inlet 220 and / or steam outlet 230 is set towards the blast furnace opening (i.e., away from the sealing valve plate and towards the interior of the furnace body). This facilitates connection with the external steam inlet pipe 300 and steam outlet pipe 400, and utilizes the structural space of the blast furnace itself for pipeline layout.

[0027] Furthermore, along the steam flow direction (from the steam inlet 220 to the steam outlet 230), the cross-sectional area of ​​the intermediate section 200b is designed to be smaller than that of the heating ring body 200a. This variable cross-section design acts similarly to a nozzle, increasing the steam velocity before entering the heating ring body and creating a certain suction force when flowing out, promoting circulation within the steam channel 210 and preventing local overheating or undercooling.

[0028] The steam inlet 220 and steam outlet 230 are located on the intermediate section 200b at the end, which facilitates the processing. The openings face the blast furnace mouth, making the pipeline layout more rational and away from the working area of ​​the sealing valve plate, reducing interference. The necking design of the intermediate section 200b can accelerate steam flow using fluid dynamics principles, improve heat exchange efficiency, and help to quickly blow the condensate inside the heating ring 200 to the steam outlet 230 for discharge, preventing water hammer.

[0029] In some embodiments, such as Figure 3 As shown, to solve the problem of reliable connection between the heating ring 200 and the valve seat body 100, the heating ring body 200a has outwardly extending portions 200c on both sides along the axial direction. These extension portions 200c match the inner wall contour of the valve seat body 100, forming a welded edge 200d between them. By continuously or intermittently welding along the welded edge 200d, the heating ring 200 is firmly fixed inside the valve seat body 100.

[0030] By providing the extension 200c, the contact area and welding zone between the heating ring 200 and the valve seat body 100 can be increased, resulting in a more stable connection. Compared to the method in related technologies where the flow channel is directly cast into the valve seat body, this method of edge welding via the extension 200c, with the weld located at the surface junction of the heating ring 200 and the valve seat body 100, facilitates non-destructive testing (such as dye penetrant testing), and even if welding defects occur, they are easy to repair without the need to scrap the entire valve seat. Simultaneously, this structure ensures the structural integrity of the valve seat body 100, preventing its mechanical properties from being weakened by the built-in flow channel. Furthermore, welding is performed only on the extension 200c to avoid damage to the rectangular sealing cavity by the heat-affected zone, thereby ensuring the sealing performance of the heating ring body 200a (preventing steam leakage). Stainless steel welding rods are used for welding to ensure connection strength and corrosion resistance.

[0031] In some embodiments, such as Figure 3 As shown, in order to cope with the scouring effect of dust-laden airflow in the blast furnace environment, a wear-resistant coating layer 200e is applied to the surface of the heating ring body 200a (especially the surface facing the interior of the blast furnace that may be impacted by materials or airflow). This wear-resistant coating layer 200e can be made of materials such as high-chromium cast iron, silicon carbide composite material, or wear-resistant weld overlay.

[0032] The heating ring 200 itself is usually made of steel with good thermal conductivity, but its wear resistance may be insufficient. The additional wear-resistant coating 200e can effectively resist the erosion and wear of high-speed dust and materials in the blast furnace, extend the service life of the heating ring 200, prevent steam leakage due to wear and thinning, and further improve the reliability and safety of the equipment.

[0033] In some embodiments, such as Figure 5 and Figure 6 As shown, the blast furnace sealing valve seat also includes an intelligent temperature control system. Specifically, this system includes: a temperature sensor 510 mounted on the valve seat body 100, a flow valve 520 mounted on the steam inlet pipe 300, and a controller. The temperature sensor 510 and the flow valve 520 are electrically connected to the controller. The temperature sensor 510 is used to detect the real-time temperature of the valve seat body 200a. The flow valve 520 is used to control the steam flow rate entering the heating ring 200. The controller (e.g., a PLC or microcontroller) receives the temperature signal fed back by the temperature sensor 510 and adjusts the opening degree (i.e., valve position) of the flow valve 520 in real time according to the preset target temperature range. The flow valve 520 can be an electric pressure reducing valve.

[0034] The working process of the intelligent temperature control system is as follows: when the controller determines that the real-time temperature is lower than the lower threshold, the opening of the flow valve 520 is increased to increase the steam flow and thus raise the temperature; when the real-time temperature is higher than the upper threshold, the opening of the flow valve 520 is decreased to reduce the steam flow; when the temperature is within the target range, the current valve position is maintained.

[0035] In related technologies, the fixed channel cannot adjust the heating power. This embodiment achieves precise temperature control of the valve seat body 100 through closed-loop control, avoiding material dust adhesion due to insufficient heating or energy waste and seal aging due to overheating. This not only improves the adaptability of the sealing valve (able to cope with different working conditions) but also achieves energy saving and consumption reduction.

[0036] In some embodiments, the blast furnace sealing valve seat may further include a pressure sensor 530. The pressure sensor 530 is electrically connected to a controller and is used to detect the pipeline pressure of the steam inlet pipe 300. The controller is also used to control the opening or closing of the flow valve 520 based on the pressure value detected by the pressure sensor 530. In this embodiment, the pressure sensor 530 may be a pressure relay. A pressure gauge 540 may also be installed on the pipeline to display the pipeline pressure.

[0037] The controller has a preset safety pressure threshold. When a sudden drop in pressure occurs (indicating a possible leak) or a sudden increase in local temperature occurs (indicating a possible direct steam ejection), the system starts timing. If the abnormal state lasts for more than 1 minute, the system triggers an audible and visual alarm to remind the operator to check; if it lasts for more than 10 minutes, the system determines it to be a serious fault, automatically interlocks and closes the electric ball valve 550, completely cutting off the steam supply to prevent the accident from escalating and ensuring the safety of the blast furnace.

[0038] This embodiment provides dual safety protection. The biggest hidden danger in related technologies lies in the mixing of gas and steam caused by minute leaks that are difficult to detect. This solution can proactively identify steam leak events by monitoring pressure changes in the sealed cavity and automatically cut off the steam source before a major accident occurs, fundamentally solving the safety hazards of cross-pressure and mixed explosions in the background technology, and greatly improving the inherent safety level of equipment operation.

[0039] A second aspect of this application provides a blast furnace sealing valve, including the blast furnace sealing valve seat described in any of the above embodiments, and a sealing valve plate 600 that cooperates with it. Figure 5 As shown, in the installed state, the blast furnace sealing valve seat 1000 is located on the side of the sealing valve plate 600 closest to the blast furnace opening. The sealing valve plate 600 is driven by an actuator (such as a hydraulic cylinder) and can be pressed against the sealing surface of the valve seat body 100 to achieve a sealed isolation between the hopper and the blast furnace.

[0040] Thanks to the aforementioned blast furnace sealing valve seat 1000, the sealing valve as a whole features heat-resistant anti-sticking, high safety, and easy maintenance. The relative position of the valve seat and the valve plate ensures that the heating ring 200 can directly heat the area near the sealing surface, effectively preventing sealing failure caused by the condensation of furnace charge dust at the low-temperature sealing surface.

[0041] A third aspect of this application provides a blast furnace, including the blast furnace sealing valve described in the above embodiments, and a receiving hopper 700 disposed at the blast furnace inlet. The receiving hopper 700 is used to receive furnace charge from the charging pile and to feed the furnace charge into the blast furnace through the discharge port at its lower end. Figure 5 As shown, the receiving hopper 700 is connected to the flange of the blast furnace body through the receiving hopper flange 710 on its outer edge.

[0042] The receiving hopper flange 710 has a pre-set through hole. The steam inlet pipe 300 and the steam outlet pipe 400 are led out from the heating ring 200 of the blast furnace sealing valve seat, pass through the through hole, and extend from the inside of the blast furnace body to the outside of the blast furnace so as to connect with the external steam source and condensate recovery system.

[0043] A through hole is made on the receiving hopper flange 710 to provide a standardized and well-sealed channel for the steam pipeline to exit. By using the flange connection interface to pass the pipeline out, it is possible to avoid additional openings in the blast furnace shell, maintain the integrity of the furnace structure, and reduce installation difficulty and leakage risk.

[0044] It should be noted that the steam inlet pipe 300 and the steam outlet pipe 400 can be flexible hoses. The connection between the steam inlet pipe 300 and the steam outlet pipe 400 and the intermediate section 200b can be secured to the intermediate section 200b joint using stainless steel hose clamps (clamps), or crimp-type connectors or quick-connect fittings can be used to achieve sealing and prevent detachment. For high-pressure or critical applications, double hose clamps can be installed back-to-back. In some embodiments, the intermediate section 200b of the heating ring 200 can extend directly from the through hole of the receiving hopper flange 710 to the outside of the blast furnace, and then the steam inlet pipe 300 and the steam outlet pipe 400 can be connected to the intermediate section 200b. Since the intermediate section 200b is integrally formed with the heating ring body 200a, even if steam leakage occurs at the connection between the steam inlet pipe 300 and the steam outlet pipe 400 and the intermediate section 200b, steam will not enter the blast furnace, thereby further avoiding safety issues.

[0045] In some embodiments, such as Figure 5 As shown, the receiving hopper 700 includes a conical receiving hopper body 700a and at least one buffer member 700b. The receiving hopper body 700a, along the direction of gravity, has an upper end for receiving furnace charge and a lower end for feeding the furnace charge into the blast furnace. The buffer member 700b is disposed on the inner wall of the receiving hopper body 700a and has a receiving surface that opens towards the inlet (i.e., obliquely upwards). The buffer member 700b can be an annular boss, multiple circumferentially arranged ear plates, or a complete truncated conical baffle.

[0046] When the furnace charge falls from the feed inlet, a portion of it first lands on the receiving surface of the buffer 700b, forming a natural cushion of accumulated charge. Subsequent charges will impact this cushion instead of directly striking the metal inner wall of the receiving hopper body 700a or the lower sealing valve seat.

[0047] This embodiment incorporates a buffer element 700b on the inner wall of the receiving hopper. The accumulation of the furnace charge itself forms a protective layer, effectively buffering the direct impact and wear of the high-temperature, high-speed falling furnace charge on the inner wall of the receiving hopper and the sealing valve seat below. This extends the service life of the receiving hopper 700 and the sealing valve, reducing the frequency of blast furnace shutdowns and maintenance due to wear.

[0048] In some embodiments, such as Figure 5As shown, the receiving hopper 700 also includes multiple irregularly shaped wear-resistant protective plates 700c. These protective plates 700c are attached to the inner wall of the receiving hopper body 700, and at least some of the irregularly shaped wear-resistant protective plates 700c are located between the buffer member 700b and the feed inlet (i.e., the area above the buffer member 700b), and / or between the buffer member 700b and the discharge outlet (i.e., the area below the buffer member 700b). The shape of the irregularly shaped wear-resistant protective plates 700c is adapted to the curved surface of the inner wall of the receiving hopper body 700a, and they can be fixed by bolts or welding. Their material is a high-hardness wear-resistant alloy or ceramic composite material.

[0049] In this embodiment, removable and replaceable irregularly shaped protective plates 700c are provided above and below the buffer component 700b. The upper area withstands the high-speed impact and sliding wear of the furnace charge, while the lower area withstands the friction of the furnace charge after it has been decelerated by the buffer. This multi-layered, zoned protection system works in conjunction with the buffer component 700b to achieve all-round protection of the inner wall of the receiving hopper. At the same time, as an independent component, the irregularly shaped protective plate 700c can be replaced individually when it wears to a certain extent, without having to replace the entire receiving hopper, significantly reducing maintenance costs and replacement difficulty.

[0050] Furthermore, the 700c irregularly shaped wear-resistant protective plate can be precisely cut or customized according to the actual geometry of the equipment's inner wall, thus achieving a seamless coverage of complex surfaces. Compared to conventional rectangular plates, which often require piecing together and cutting during installation and tend to place welds or connection points in areas of frequent material impact or high stress, the 700c irregularly shaped wear-resistant protective plate can use a more rational layout design to intentionally avoid high-stress areas, placing the joints in relatively low-stress locations. This prevents materials from directly impacting weak points at the joints during flow or impact, significantly reducing the risk of damage due to weld cracking or connection failure, thereby effectively extending the service life of the protective plate and improving the overall reliability of the equipment.

[0051] The fourth aspect of this application also provides a blast furnace sealing valve control method, applied to the blast furnace sealing valve described in the above embodiments. The blast furnace sealing valve includes a temperature sensor 510 disposed on a valve seat body 100, a flow valve 520 disposed on a steam inlet pipe 300, and a controller. The temperature sensor 510 and the flow valve 520 are electrically connected to the controller. Figure 7 As shown, the blast furnace sealing valve control method includes the following steps: Step S101: Obtain the real-time temperature of the valve seat body 100 detected by the temperature sensor 510; Step S102: If the real-time temperature is less than the lower threshold, control the flow valve 520 to increase its opening. Step S103: If the real-time temperature is greater than the upper limit threshold, control the flow valve 520 to reduce its opening.

[0052] If the real-time temperature is greater than the lower threshold and less than the upper threshold, the current opening of the flow valve 520 can be maintained, or the opening of the flow valve 520 can be slightly adjusted.

[0053] In related technologies, the fixed channel cannot adjust the heating power. This embodiment achieves precise temperature control of the valve seat body 100 through closed-loop control, avoiding material dust adhesion due to insufficient heating or energy waste and seal aging due to overheating. This not only improves the adaptability of the sealing valve (able to cope with different working conditions) but also achieves energy saving and consumption reduction.

[0054] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0055] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0056] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0057] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A blast furnace sealing valve seat, characterized in that, include: The valve seat body is circular in shape; A heating ring is connected to the inner wall of the valve seat body; a steam passage is provided inside the heating ring, and the heating ring also has a steam inlet and a steam outlet communicating with the steam passage; The steam inlet pipe is connected to the steam passage through the steam inlet port; The steam outlet pipe is connected to the steam passage through the steam outlet. The heating ring is a non-closed-loop structure to form a unidirectional steam flow path from the steam inlet to the steam outlet.

2. The blast furnace sealing valve seat according to claim 1, characterized in that, The heating ring includes a heating ring body and intermediate sections respectively provided at both ends along the circumferential direction; The steam inlet and the steam outlet are respectively provided on the two intermediate sections, and the openings of the steam inlet and / or the steam outlet face the blast furnace opening; Along the steam flow direction, the cross-sectional area of ​​the middle section is smaller than the cross-sectional area of ​​the heating ring body.

3. The blast furnace sealing valve seat according to claim 2, characterized in that, The heating ring body has extensions on both sides along the axial direction, and the extensions form a welded edge with the inner wall of the valve seat body to fix the heating ring to the valve seat body.

4. The blast furnace sealing valve seat according to any one of claims 1 to 3, characterized in that, The blast furnace sealing valve seat further includes: a temperature sensor disposed on the valve seat body, a flow valve disposed on the steam inlet pipe, and a controller, wherein the temperature sensor and the flow valve are electrically connected to the controller respectively; The temperature sensor is used to detect the real-time temperature of the valve seat body; the flow valve is used to control the steam flow rate; and the controller is used to adjust the valve position of the flow valve based on the real-time temperature detected by the temperature sensor.

5. The blast furnace sealing valve seat according to claim 4, characterized in that, The blast furnace sealing valve seat also includes a pressure sensor, which is electrically connected to the controller and is used to detect the pipeline pressure of the steam inlet pipe; The controller is also used to control the flow valve to open or close based on the pressure value detected by the pressure sensor.

6. A blast furnace sealing valve, characterized in that, It includes a blast furnace sealing valve seat and a sealing valve plate as described in any one of claims 1 to 5, wherein the blast furnace sealing valve seat is located on the side of the sealing valve plate near the blast furnace opening.

7. A blast furnace, characterized in that, Includes the blast furnace sealing valve as described in claim 6 and a receiving hopper disposed at the blast furnace inlet; the receiving hopper is connected to the blast furnace body via a receiving hopper flange; The receiving hopper flange is provided with a through hole, through which the steam inlet pipe and the steam outlet pipe extend from the blast furnace body.

8. The blast furnace according to claim 7, characterized in that, The receiving hopper includes: The receiving hopper body is conical, with a feed inlet at the upper end and a discharge outlet at the lower end along the direction of gravity; At least one buffer is disposed on the inner wall of the receiving body; the buffer has a receiving surface that is open toward the feed inlet.

9. The blast furnace according to claim 8, characterized in that, The receiving hopper also includes multiple irregularly shaped wear-resistant protective plates attached to the inner wall of the receiving hopper body, and at least some of the irregularly shaped wear-resistant protective plates are located between the buffer and the feed inlet and / or between the buffer and the discharge outlet.

10. A method for controlling a blast furnace sealing valve, characterized in that, The blast furnace sealing valve as described in claim 6 includes a temperature sensor mounted on the valve seat body, a flow valve mounted on the steam inlet pipe, and a controller, wherein the temperature sensor and the flow valve are electrically connected to the controller; the blast furnace sealing valve control method includes: The real-time temperature of the valve seat body detected by the temperature sensor is obtained. If the real-time temperature is less than the lower threshold, the flow valve is controlled to increase its opening. If the real-time temperature is greater than the upper limit threshold, the flow valve is controlled to reduce its opening.

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