Rolling seal valve for shaft furnace

Abstract

The rolling seal valve comprises two cylindrical rolling cores with transmission parts and a valve body matched with the cylindrical rolling cores, the upper end and the lower end of the valve body are communicated to form a material channel, an opening is formed in the cylindrical surface of each rolling core, and the transmission parts are arranged in the center of one end of each rolling core; round open holes matched with the transmission part of the rolling core are formed in the two opposite side faces of the valve body, and the transmission part of the rolling core penetrates through the round open holes. The inner side of the valve body and the rotating cylindrical surface of the rolling core form extrusion sealing; the inner sides of the two faces, provided with the holes, of the main valve body and the cylindrical bottom face of the rolling core form extrusion sealing. The rolling cores are oppositely arranged and can be driven by external force to rotate, extrusion sealing is formed in one position state, and openings of the two cylindrical surfaces are opposite to form a through channel in the other position state. Smooth discharging during feeding and discharging can be guaranteed, and meanwhile good sealing performance is kept.

Description

Technical Field

[0001] The present invention belongs to the field of valves, and particularly relates to a rolling seal valve for a gas-based shaft furnace in the direct reduced iron process. Background Art

[0002] In the modern gas-based shaft furnace technology of the direct reduced iron process based on natural gas, coke oven gas, and syngas, valves are key components, especially the shaft furnace feed and discharge valves for high-pressure working conditions. Currently, valves used in gas-based shaft furnace technology generally adopt ordinary soft-sealed ball valves. However, such traditional valves have exposed many technical defects in actual applications: First, when transporting high-temperature solid reduced iron balls and granular materials, the materials are extremely likely to get stuck inside the valve cavity, causing the valve rotating mechanism to jam, seriously affecting the normal opening and closing function of the equipment; Second, during long-term operation, material particles will continuously accumulate in the valve cavity, not only requiring frequent shutdowns for disassembly and cleaning, but also greatly increasing the maintenance workload and production costs; Third, the traditional soft-sealed structure is severely worn under the continuous scouring of high-temperature granular materials, and the sealing performance rapidly decays, resulting in a significant increase in the risk of medium leakage; In addition, the sealing rings of soft-sealed ball valves are extremely likely to be damaged during maintenance disassembly and installation, further increasing the equipment maintenance cost and downtime. These problems seriously restrict the operation stability and production efficiency of gas-based shaft furnaces. Summary of the Invention

[0003] The purpose of the present invention is to provide a rolling seal valve for a shaft furnace, aiming to solve at least some of the technical problems in the prior art.

[0004] To achieve the above purpose, the present invention provides a rolling seal valve for a shaft furnace, including:

[0005] Two rotatable cylindrical rolling cores with transmission parts and a valve body matching with them. The upper and lower ends of the valve body are penetrated to form a first channel. The rolling cores are arranged inside the valve body. The rolling cores include a groove part and a cylindrical surface part. When the groove part of at least one rolling core faces the other rolling core, a second channel communicating with the first channel is formed, otherwise, an extrusion seal is formed. Among them, the first channel and the second channel communicate to form a material channel.

[0006] Preferably, a transmission part is arranged at the center position of at least one end of each rolling core.

[0007] Preferably, the cross-sectional shape of the second channel is the same as that of the first channel.

[0008] Preferably, the cross-section of the groove along the axial direction of the rolling core is circular or rectangular.

[0009] Preferably, when the groove parts of the two rolling cores are directly opposite, the diameter of the second channel formed is the same as the diameter of the first channel inside the valve body.

[0010] Preferably, the valve body includes a main valve body and two end covers provided with openings, and the end covers are fixedly connected to the main valve body.

[0011] Preferably, a sealing ring is provided between the main valve body and the end cover.

[0012] Preferably, a sealing ring is provided between the end cover and the transmission part of the rolling core.

[0013] Preferably, the surface of the rolling core is coated with a wear-resistant alloy coating.

[0014] Preferably, the rotation angle of the rolling core is 90°, which is used to switch between the sealed state and the material discharging state.

[0015] Compared with the prior art, the rolling seal valve of the present invention has the following technical effects:

[0016] Adopting the design of opposed rolling cores can avoid the opening and closing failure caused by material jamming, provide higher sealing performance, and is easy to maintain and clean. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the rolling seal valve of the present invention;

[0018] Figure 2 is a schematic diagram of the state of the rolling core of the rolling seal valve of the present invention in the sealed state;

[0019] Figure 3 is a schematic diagram of the state of the rolling core of the rolling seal valve of the present invention in the material discharging state. Detailed Embodiments

[0020] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances to facilitate the understanding of the embodiments of the present invention described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a product or device comprising a series of units does not necessarily have to be limited to those units clearly listed, but may include other units not clearly listed or inherent to such products or devices.

[0022] In the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation.

[0023] Moreover, in addition to being able to represent an orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0024] In addition, the terms "mounted", "arranged", "provided with", "connected", "coupled", "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0026] Embodiment

[0027] In the prior art, valves are key components in modern gas-based shaft furnace technology for direct iron reduction processes based on natural gas, coke oven gas and synthesis gas, especially shaft furnace feed and discharge valves for high-pressure working conditions. When dealing with high-temperature solid reduced iron balls and particles, the common soft-sealed ball valves currently used have the problem of materials being squeezed into the valve cavity and causing rotation failure. The sealing ring is easily worn by particles and easily damaged during maintenance, and needs to be frequently disassembled and cleaned, affecting production efficiency.

[0028] In order to solve the above problems, considering that material jamming mainly comes from particles being retained in the valve cavity when the ball valve is closed, a structure that can actively guide the flow of materials needs to be designed. By analyzing the motion trajectory of the rotating parts, it is found that the continuous rotation of the cylindrical roller core can avoid the accumulation of materials in the cavity when the ball valve is opened and closed. Then, two roller cores with complementary structures are conceived, and dynamic seals are formed by alternating the grooves and the cylinder. When the grooves are aligned, a material channel is established, and when the cylinder is squeezed, the channel is blocked. At the same time, the continuous contact between the cylindrical surface and the valve body is used to reduce the wear of the seal.

[0029] The present invention provides a rolling sealing valve for a vertical furnace, referring to Figure 1 As shown, the rolling sealing valve includes two rotatable cylindrical roller cores 11, 12 with a transmission part and a valve body 01 matched therewith, the upper and lower ends of the valve body 01 are connected to form a first channel, and the first channel is used to connect the feed port and the discharge port of the vertical furnace; the roller cores 11, 12 are arranged in the valve body 01, and the roller cores 11, 12 include a groove part and a cylindrical part; when the groove part of at least one roller core faces the other roller core, a second channel connected to the first channel is formed, otherwise an extrusion seal is formed.

[0030] The rotatable cylindrical roller refers to a cylinder with an axisymmetric structure, whose cylindrical surface maintains sliding contact with the inner wall of the valve body and changes the orientation of the groove by rotation. The groove part refers to the depressed area of the cylindrical surface, which can be formed by milling or casting process, and is used to form a material flow path at a specific rotation angle. The cylindrical part refers to the unprocessed complete cylindrical surface, which is used to form a surface contact seal with the cylindrical area of another roller when the groove is misaligned. The transmission part can be connected to an external drive device and can rotate under the drive of an external force. When using the rolling sealing valve of the vertical furnace, the switching of the sealing and unloading states is completed by controlling the rotation angle of the two cylindrical rollers. Such as Figure 2 As shown, when the rollers 11 and 12 rotate to a certain position, the solid parts of the two roller cylinders are in close contact, forming an extrusion seal to block the material passage; Figure 3As shown in the figure, when the rolling cores 11 and 12 rotate forward or backward until the grooves are opposite to each other, the openings of two opposite grooves of the rolling cores 11 and 12 form a through-channel, allowing the material to pass through. The cross-sectional area of the second channel formed when the groove parts of the two rolling cores are completely opposite is the largest, and the material feeding is the smoothest. When the groove part of one rolling core is opposite to the cylindrical surface part of the other rolling core, a second channel can also be formed, but at this time the cross-sectional area of the second channel is not the largest, and the material feeding speed cannot reach the maximum value.

[0031] In one embodiment, a transmission part is arranged at the center position of one end of each of the rolling cores 11 and 12. The transmission part is used to connect an external driving device. The rolling cores 11 and 12 can be driven by a pneumatic, hydraulic or electric device to achieve remote control and automated operation. When the transmission part is arranged at the center of the rolling core end, the driving force is evenly transmitted along the axis of the rolling core, so that the rotation center coincides with the geometric center. In this state, the forces on both sides of the rolling core are symmetrical, eliminating the deflection moment generated due to the deviation of the transmission part from the axis, thereby preventing uneven friction between the rolling core and the valve body. During the installation process, the central positioning of the transmission part can simplify the centering adjustment steps, reduce the axis offset caused by assembly errors, keep the rolling core in dynamic balance during rotation, and avoid jamming.

[0032] In another embodiment, transmission parts are arranged at the center positions of both ends of each of the rolling cores 11 and 12, and the transmission effect is more stable.

[0033] In one embodiment, the cross-sectional shape of the second channel is the same as that of the first channel. During the flow of the material, no turbulence or local resistance is generated due to the sudden change of the channel cross-section. The collision probability between the particles and the channel wall is reduced, reducing the material retention and the friction of the sealing surface.

[0034] In one embodiment, the cross-section of the groove along the axial direction of the rolling core is circular, and its continuous curved surface can prevent the material from staying in the channel. In another embodiment, the cross-section of the groove along the axial direction of the rolling core is rectangular, and the planar structure is more conducive to controlling the contact accuracy of the sealing surface.

[0035] In one embodiment, the diameter of the second channel formed when the groove parts of the two rolling cores are directly opposite is the same as the diameter of the first channel in the valve body 01. When the material passes through, there is no sudden change or reduction in the channel cross-section, and the flow resistance of the high-temperature particulate material is reduced. The design of the same pipe diameter reduces the residual amount of the material at the edge of the sealing surface, avoiding the particles from getting stuck in the sealing area.

[0036] In one embodiment, the valve body 01 includes a main valve body and two end covers 31 and 32 provided with openings. The end covers 31 and 32 are fixedly connected to the main valve body.

[0037] Among them, the main valve body refers to the main structure that constitutes the valve housing, which can be specifically manufactured by casting or welding processes and is used to accommodate the rolling core and form the main part of the material channel. Among them, the end covers refer to the split covers arranged on both sides of the main valve body, and their hole designs provide installation space for the rolling core transmission parts. Among them, the fixed connection refers to the assembly method between the end cover and the main valve body, which can be specifically realized by a combined structure of bolts and sealing gaskets to ensure the airtightness and structural strength of the connection. When it is necessary to clean the internal impurities, only the end cover needs to be disassembled to directly access the inside of the valve cavity without removing the overall structure of the main valve body. The fixed connection method ensures the sealing performance and realizes quick disassembly and assembly through a standardized interface design. The split structure confines the maintenance operation to the end cover area, avoiding repeated disassembly and assembly of the main valve body and the pipeline system, thereby reducing the risk of mechanical damage to the sealing ring during maintenance.

[0038] In one embodiment, to enhance the sealing performance, sealing rings 21 and 22 are provided between the main valve body and the end covers 31 and 32. The sealing ring refers to an annular sealing element made of an elastic material, which can be specifically realized by fluororubber or silicone rubber. By deforming to fill the assembly gap between the main valve body and the end cover, it effectively prevents the leakage of high-temperature solid materials from the connection between the main valve body and the end cover, avoids permanent damage caused by repeated disassembly, and significantly reduces the maintenance frequency and replacement cost of the sealing structure.

[0039] In one embodiment, to enhance the sealing performance, sealing rings 41 and 42 are provided between the end covers 31 and 32 and the transmission parts of the rolling cores 11 and 12. The sealing ring refers to an annular sealing element made of an elastic material, which can be specifically realized by fluororubber or silicone rubber. By deforming to fill the assembly gap between the inner hole of the end cover and the outer wall of the transmission part, it effectively prevents external particles from entering the inside of the transmission part and causing jamming, reduces the failure rate of the transmission mechanism due to impurity wear, and reduces the number of disassembly and maintenance of the sealing structure. The elastic contact of the sealing ring avoids direct friction damage between the transmission part and the end cover, extends the service life of the rotating parts, and at the same time inhibits the leakage of gas or materials along the axial direction of the transmission part, improving the operating stability of the equipment.

[0040] In one embodiment, the surfaces of the rolling cores 11 and 12 are coated with wear-resistant alloy coatings. This coating can enhance the surface wear resistance, reduce the direct erosion of the rolling core body by the friction of material particles, and improve the wear resistance and service life. Specifically, when the rolling cores come into contact with high-temperature solid material particles during rotation, the wear-resistant alloy coating resists the cutting and scratching actions of the particles through its high hardness characteristics. In the sealed state, the cylindrical surface part covered by the coating and the groove part of another rolling core form a squeeze sealing surface, and the surface of the coating is not easily deformed or indented due to friction, thus maintaining the integrity of the sealing surface. In the state where the material channel is open, the coating protects the side wall of the groove part to prevent wear caused by the passing of particles. Since the coating directly bears the wear, the loss of the rolling core body material is effectively delayed, thereby reducing the risk of seal failure caused by surface damage.

[0041] In one embodiment, the rotation angle of the rolling cores 11 and 12 is 90°, realizing the switching between the sealed state and the discharging state. Among them, the rotation angle of 90° means that the amplitude of the rolling core rotating around its own axis is limited within a right-angle range, and specifically, a mechanical limit device or an angle sensor can be used to achieve control. This angle range enables the groove part and the cylindrical surface part to form two definite states after rotation, ensuring the reliable switching of the sealing and discharging actions. This rotation angle is designed as the minimum effective stroke, which not only maximizes the contact area between the groove and the cylindrical surface but also avoids the generation of excessive displacement during rotation, resulting in wear of the sealing surface. By precisely controlling the rotation angle, the rolling cores will not cause misalignment of the sealing surface due to excessive rotation during the switching process, nor will there be residual gaps in the channel due to insufficient rotation.

[0042] Compared with the prior art, the rolling seal valve of the present invention adopting the opposed rolling core design has the following technical effects:

[0043] 1. Improve the problem of material accumulation in the valve cavity

[0044] The design of the rolling valve adopts rolling seal elements and can freely perform forward and reverse rotation actions without a valve cavity design. This design can effectively reduce the adhesion of impurities and particles on the rolling cores and the inner wall, and reduce the retention and accumulation of the medium in the valve cavity. The sealing rings of soft-sealed ball valves usually adopt materials such as polytetrafluoroethylene (PTFE). Although they have good sealing performance, they are prone to accumulate impurities and particles in the valve cavity. When dealing with media containing solid particles, the sealing rings of soft-sealed ball valves will be worn, resulting in a decline in sealing performance, and at the same time, particulate matter is likely to accumulate in the valve cavity.

[0045] 2. Sealing performance

[0046] The rolling seal element of the rolling valve can provide higher sealing performance. Especially when dealing with media containing solid particles, the rolling element can effectively prevent particles from entering the sealing surface. However, the sealing ring of the soft-sealed ball valve is prone to aging and wear after long-term use. Especially in high-temperature or corrosive media, the sealing performance will gradually decline. When the sealing ring of the soft-sealed ball valve deals with media containing solid particles, it is easily scratched by the particles, resulting in damage to the sealing surface.

[0047] 3. Maintenance and cleaning

[0048] The structural design of the rolling valve makes maintenance and cleaning more convenient. The rolling element can be easily disassembled and replaced. The sealing element of the rolling valve can automatically clean during the movement process, reducing the maintenance frequency. However, the sealing ring of the soft-sealed ball valve is prone to accumulating impurities after long-term use and needs to be disassembled and cleaned regularly. The sealing ring of the soft-sealed ball valve is easily damaged during the disassembly and installation process, increasing the maintenance cost.

[0049] In summary, the rolling seal valve of the present invention has significant advantages over the ordinary soft-sealed ball valve in terms of valve cavity material accumulation, sealing performance, etc. It is especially suitable for working conditions dealing with media containing high-temperature solid particles and meets the requirements of the shaft furnace process.

[0050] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them. Those of ordinary skill in the art should understand that: the technical solutions recorded in the foregoing embodiments can be modified, or some of the technical features can be equivalently replaced; these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rolling seal valve for a shaft furnace, characterized in that, Comprising: Two rotatable cylindrical roller cores (11, 12) with transmission parts and a valve body (01) matching therewith. The upper and lower ends of the valve body (01) are penetrated to form a first channel. The roller cores (11, 12) are arranged in the valve body (01). The roller cores (11, 12) include a groove part and a cylindrical surface part; when the groove part of at least one roller core faces the other roller core, a second channel communicating with the first channel is formed, otherwise, an extrusion seal is formed; wherein, the first channel and the second channel communicate to form a material channel.

2. The rolling seal valve according to claim 1, wherein A transmission part is arranged at the center position of at least one end of each of the roller cores (11, 12).

3. The rolling seal valve according to claim 1, wherein The cross-sectional shape of the second channel is the same as that of the first channel.

4. The rolling seal valve according to claim 3, characterized in that, The cross-section of the groove along the axial direction of the roller core is circular or rectangular.

5. The rolling seal valve according to claim 1, wherein When the groove parts of the two roller cores face each other directly, the diameter of the second channel formed is the same as the diameter of the first channel in the valve body (01).

6. The rolling seal valve according to claim 1, wherein The valve body (01) includes a main valve body and two end covers (31, 32) provided with openings. The end covers (31, 32) are fixedly connected to the main valve body.

7. The rolling seal valve according to claim 6, characterized in that, Sealing rings (21, 22) are arranged between the main valve body and the end covers (31, 32).

8. The rolling seal valve according to claim 6, wherein Sealing rings (41, 42) are arranged between the end covers (31, 32) and the transmission parts of the roller cores (11, 12).

9. The rolling seal valve according to any one of claims 1-4, characterized in that The surfaces of the roller cores (11, 12) are coated with wear-resistant alloy coatings.

10. The rolling seal valve according to any one of claims 1-4, characterized in that, The rotation angle of the roller cores (11, 12) is 90°, which is used to switch between the sealed state and the feeding state.

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