Multi-layer composite masonry structure for upper groove of RH furnace and precise construction method of multi-layer composite masonry structure

Abstract

The invention discloses an RH furnace upper groove multi-layer composite masonry structure and a precise construction method thereof, and relates to the technical field, the RH furnace upper groove multi-layer composite masonry structure comprises an RH furnace upper groove body, the RH furnace upper groove body is sequentially provided with a brick supporting plate, a heat preservation layer, light bricks, a permanent layer and a working layer from outside to inside, and the top of the RH furnace upper groove body is provided with an upper groove flange; filling fiber felt is arranged outside the upper groove flange, and a discharging pipe is arranged at the top of one side of the RH furnace upper groove body. The service life of the alloy feeding port is prolonged to 12 months from 3 months, so that the service life of the alloy feeding port is prolonged, the temperature of a furnace shell is reduced to 120 DEG C or below, energy is saved by 15%, the heat efficiency of the alloy feeding port is better, heat can be fully reserved, the center offset is smaller than or equal to 1 mm, molten steel splashing can be effectively eradicated, the safety of the alloy feeding port is controllable, the local replacement efficiency is improved by 50%, and the maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the technical field, specifically to a multi-layer composite masonry structure for the upper trough of an RH furnace and its precise construction method. Background Technology

[0002] The upper trough of the RH furnace is one of the key components of the RH vacuum refining furnace. It usually refers to the upper area of ​​the vacuum trough. Together with the middle and lower troughs, it forms the main structure of the furnace body. It is mainly located at the top of the equipment and is directly connected to the hot bending pipe. It is used to contain molten steel and participate in the vacuum circulation refining process.

[0003] However, the existing RH refining furnace's upper trough and alloy charging port are subjected to the scouring of molten steel at temperatures above 1600℃ and the impact of alloy materials for a long time. The traditional masonry method has the following defects: single-layer refractory bricks are prone to cracking and peeling, especially in the alloy charging port area, where frequent thermal shocks result in a lifespan of less than 3 months, thus causing poor structural stability. The gap between the insulation layer and the working layer is not strictly controlled (>3mm), and the furnace shell temperature exceeds 250℃, resulting in serious heat loss and reduced utilization. Furthermore, the connection between the alloy charging port and the upper trough of the RH furnace is prone to material accumulation and blockage, thus reducing the smoothness of material feeding and reducing the feeding efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-layer composite masonry structure for the upper trough of an RH furnace and its precise construction method to address the problems it solves.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-layer composite masonry structure for the upper trough of an RH furnace, comprising an upper trough body of an RH furnace, wherein the upper trough body of the RH furnace is provided with, from the outside to the inside, a brick support plate, an insulation layer, lightweight bricks, a permanent layer and a working layer, an upper trough flange is provided at the top of the upper trough body of the RH furnace, and a fiber felt filling layer is provided on the outside of the upper trough flange, a feeding pipe is provided at the top of one side of the upper trough body of the RH furnace, the feeding end of the feeding pipe is an alloy feeding port, a connection point is provided at the connection end of the feeding pipe and the upper trough body of the RH furnace, a positioning wooden strip is provided at the feeding end of the feeding pipe, a centerline of the feeding pipe is provided at the middle position inside the feeding pipe, and an alloy feeding port module is provided on the inner wall of the feeding pipe;

[0006] The insulation layer, from top to bottom, includes calcium silicate board and lightweight high-alumina insulating bricks, and the number of lightweight high-alumina insulating bricks is eleven. The permanent layer includes magnesia-chromium bricks, and the number of magnesia-chromium bricks is eleven.

[0007] The feeding pipe has an movable hole extending into the interior of the feeding pipe at the bottom near the upper tank body of the RH furnace. A protective cover is provided on the outside of the feeding pipe, and a vibrating plate extending into the movable hole is provided inside the protective cover. A motor is installed at one end of the feeding pipe, and a gear is provided at the output end of the motor. A rotating shaft is rotatably connected to one side of the inside of the vibrating plate, and a triangular linkage block is provided on the outside of the rotating shaft. An elastic element is provided between the protective cover and the feeding pipe.

[0008] As a further embodiment of the present invention: the vibrating plate is movably connected to the feeding pipe through a movable hole, and the inner wall height of the vibrating plate extends into the interior of the feeding pipe.

[0009] As a further embodiment of the present invention: the rotating shaft is rotatably connected to the vibrating plate through a bearing, and a chain belt is sleeved on the outside of the gear and the triangular linkage block.

[0010] As a further aspect of the present invention, the gap between the insulation layer and the working layer is controlled at 3mm.

[0011] As a further embodiment of the present invention: the working layer includes magnesia-chromium bricks, and the magnesia-chromium bricks are composed of a bottom layer of vertical brickwork, a middle layer of horizontal brickwork, and a top layer of BTS-bricks.

[0012] As a further embodiment of the present invention: the alloy feeding port module is composed of BTH-T adjusting bricks, BTH-J combined bricks and BTH-A / B chute bricks.

[0013] As a further aspect of the present invention: the precise construction method for the multi-layer composite masonry structure of the upper RH furnace includes the following steps:

[0014] Step 1, precise positioning of the brick support plate: Weld a 160mm×15mm brick support plate at 380mm above the upper surface of the fourth layer of the shell, and add vertical ribs for vertical welding;

[0015] Step 2, staggered joint construction method: The insulation layer and the permanent layer are staggered by ≥1 / 2 brick length in each layer, and the working layer is laid alternately with horizontal and vertical bricks;

[0016] Step 3: Alloy orifice centering method;

[0017] Step 4, Infrared probe protection process: When building to the probe position, process the brick body and seal the gaps with magnesium chromium fire mortar.

[0018] As a further embodiment of the present invention: the alloy opening centering method is as follows: 1. Fix the radius positioning wooden strip on the metal cylinder construction platform; 2. After centering the connection point between the upper groove and the steel shell, weld the steel pipe; 3. Connect the centering points of the cylinder midpoint and the lower groove and the steel shell to find the centerline of the discharge port; 4. Recheck the deviation ≤1mm.

[0019] As a further aspect of the present invention, the vertical angle of the vertical rib is controlled within 0°-0.5°.

[0020] As a further aspect of the present invention, the center offset of the alloy feeding port is less than 5mm.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This invention extends the lifespan of the alloy feed port from 3 months to 12 months, thereby improving its service life;

[0023] 2. The furnace shell temperature of this invention is reduced to below 120℃, saving 15% of energy, thereby improving its thermal efficiency and fully retaining heat;

[0024] 3. The center offset of this invention is ≤1mm, which can effectively prevent molten steel splashing and make its safety controllable;

[0025] 4. This invention improves the efficiency of partial replacement by 50%, thereby reducing maintenance costs and increasing utilization to a certain extent;

[0026] 5. The present invention causes the triangular linkage block to rotate while repeatedly moving the protective cover 3, so that the vibrating plate generates a pushing force on the material inside the feed pipe 2 through the movable hole, thereby avoiding material blockage at this position, improving the smoothness of feeding, and improving the feeding efficiency. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view of the upper groove multi-layer structure of the present invention;

[0028] Figure 2 This is a detailed drawing of the alloy feed port construction for the present invention;

[0029] Figure 3 This is a detailed drawing of the partial masonry construction of the alloy feed port of the present invention;

[0030] Figure 4 This is a partial structural diagram of the present invention;

[0031] Figure 5 This is a structural diagram of the expansion joint of the present invention;

[0032] Figure 6 This is a partial perspective view of the present invention;

[0033] Figure 7 This is a schematic diagram of the vibrating plate structure of the present invention;

[0034] Figure 8 This is an enlarged view of A in part 5 of the present invention.

[0035] In the diagram: 1. Upper tank body of RH furnace; 101. Brick support plate; 102. Calcium silicate board; 103. Lightweight brick; 104. Permanent layer; 105. Working layer; 106. Upper tank flange; 107. Filling fiber felt; 2. Feed pipe; 201. Connection point; 202. Positioning wooden strip; 203. Centerline of feed pipe; 204. Movable hole; 3. Protective cover; 301. Vibrating plate; 302. Motor; 303. Gear; 304. Chain belt; 305. Rotating shaft; 306. Triangular linkage block. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] Please see Figures 1-8In this embodiment of the invention, a multi-layer composite masonry structure for the upper trough of an RH furnace includes an upper trough body 1. The upper trough body 1 is provided with a brick support plate 101, an insulation layer, a lightweight brick 103, a permanent layer 104, and a working layer 105 from the outside to the inside. An upper trough flange 106 is provided on the top of the upper trough body 1. A fiber felt 107 is provided on the outside of the upper trough flange 106. A feeding pipe 2 is provided on the top of one side of the upper trough body 1. The feeding end of the feeding pipe 2 is an alloy feeding port. A connection point 201 is provided at the connection end between the feeding pipe 2 and the upper trough body 1. A positioning wooden strip 202 is provided at the feeding end of the feeding pipe 2. A feeding pipe centerline 203 is provided at the middle position inside the feeding pipe 2. An alloy feeding port module is provided on the inner wall of the feeding pipe 2.

[0039] The insulation layer, from top to bottom, includes calcium silicate board 102 and lightweight high-alumina insulating bricks, and the number of lightweight high-alumina insulating bricks is eleven. The permanent layer 104 includes magnesia-chromium bricks, and the number of magnesia-chromium bricks is eleven.

[0040] The bottom of the feeding pipe 2 is provided with an movable hole 204 extending into the interior of the feeding pipe 2 near the upper tank body 1 of the RH furnace. A protective cover 3 is provided on the outside of the feeding pipe 2. A vibrating plate 301 extending into the movable hole 204 is provided inside the protective cover 3. A motor 302 is installed at one end of the feeding pipe 2. A gear 303 is provided at the output end of the motor 302. A rotating shaft 305 is rotatably connected to one side inside the vibrating plate 301. A triangular linkage block 306 is provided on the outside of the rotating shaft 305. An elastic element is provided between the protective cover 3 and the feeding pipe 2.

[0041] In this embodiment, the output end of the motor 302 can rotate under the action of electricity, driving the gear 303 and the chain belt 304 to rotate. At the same time, the chain belt 304 carries the triangular linkage block 306 to rotate. The rotation of the triangular linkage block 306 and its triangular structure make it generate a rebound force on the protective cover 3 while rotating. At the same time, the vibrating plate 301 generates a pushing force on the material inside the feed pipe 2 through the movable hole 204, thereby avoiding material blockage at this position and improving the smoothness of its feeding.

[0042] Please refer to this carefully. Figures 5 to 8 The vibrating plate 301 is movably connected to the feeding pipe 2 through the movable hole 204, and the inner wall height of the vibrating plate 301 extends into the interior of the feeding pipe 2. The rotating shaft 305 is rotatably connected to the vibrating plate 301 through the bearing. The gear 303 and the triangular linkage block 306 are fitted with a chain belt 304.

[0043] In this embodiment, an elastic element is provided in the gap between the protective cover 3 and the feed tube 2. The elastic element improves the rebound effect of the protective cover 3. At the same time, the gap between the teeth on the outside of the gear 303 and the triangular linkage block 306 and the teeth inside the chain 304 can be compensated by the elastic force generated by the elastic element on the protective cover 3, so that the chain 304 can be straightened outside the gear 303 and the triangular linkage block 306 under the elastic action.

[0044] In this embodiment, the pipe fitting structural parameters are as follows:

[0045] part Parameter requirements effect Brick support board The lower edge is 380±1mm from the reference plane. Supporting benchmark positioning Calcium silicate board Fit tightly to the steel shell, with a gap of ≤2mm Insulation of heat conduction Expansion joints in working layer Reserve 55mm for fiber filling felt Absorbing high temperature expansion Alloy feed port diameter 416±0.5mm Ensure the accuracy of alloy flow

[0046] .

[0047] Please refer to this carefully. Figures 1 to 5 The gap between the insulation layer and the working layer 105 is controlled at 3mm.

[0048] Please refer to this carefully. Figures 1 to 5 The working layer 105 includes magnesia-chromium bricks, which are composed of a bottom layer of vertical bricklaying, a middle layer of horizontal bricklaying, and a top layer of BTS-2 bricks.

[0049] Please refer to this carefully. Figures 1 to 5 The alloy feed port module is composed of BTH-T adjusting bricks, BTH-J combination bricks and BTH-A / B chute bricks.

[0050] Please refer to this carefully. Figures 1 to 5 The precise construction method for the multi-layer composite masonry structure of the upper trough of the RH furnace includes the following steps:

[0051] Step 1, precise positioning of brick support plate 101: Weld a 160mm×15mm brick support plate 101 at 380mm above the upper surface of the fourth layer of the shell, and add vertical ribs for vertical welding;

[0052] Step 2, staggered joint construction method: The insulation layer and the permanent layer 104 are staggered by ≥1 / 2 brick length in each layer, and the working layer 105 is constructed by alternating horizontal and vertical joints;

[0053] Step 3: Alloy orifice centering method;

[0054] Step 4, Infrared probe protection process: When building to the probe position, process the brick body and seal the gaps with magnesium chromium fire mortar.

[0055] Please refer to this carefully. Figures 1 to 5 Alloy port centering method: 1. Fix the radius positioning wooden strip 202 on the metal cylinder construction platform; 2. After centering the connection point 201 between the upper groove and the steel shell, weld the steel pipe; 3. Connect the centering points of the cylinder midpoint and the lower groove and the steel shell connection point 201 to find the centerline of the discharge port; 4. Recheck the deviation ≤1mm.

[0056] Please refer to this carefully. Figures 1 to 5The vertical angle of the uprights should be controlled between 0° and 0.5°.

[0057] Please refer to this carefully. Figures 1 to 5 The center offset of the alloy feed port is less than 5mm.

[0058] The working principle of this invention is:

[0059] Phase 1: Basic structure construction includes the installation of support brick slab 101 and the construction of the insulation layer. The installation of support brick slab 101 involves welding support brick slab 101 (size 160mm×15mm, flatness ≤0.5mm / m) at 380mm above the upper surface of the fourth layer support brick slab. The vertical reinforcement is fully welded on both sides, and the welding strength must withstand 3 times the masonry load. The construction of the insulation layer involves bonding 25mm calcium silicate board 102 to the surface of support brick slab 101 with high alumina fire mortar, with gaps ≤2mm. Lightweight high alumina heat-insulating bricks (WY / WY-10 type) are then laid vertically. The first layer is processed with 1 / 2 brick length to achieve staggered joints, with mortar joints ≤1.5mm and verticality deviation ≤1°.

[0060] The second stage: the construction of permanent layer and working layer is carried out simultaneously, including the construction of permanent layer (104) and working layer (105). The construction of permanent layer (104) is carried out by laying directly bonded magnesia bricks (WB / WB-10 type) on the third layer brick support plate 101, and the magnesia ash + brine wet masonry is used with mortar joints ≤1.5mm. When the working layer (105) is built, the bottom layer is laid with semi-rebonded magnesia bricks (BTS-1) and the wooden wedges are adjusted to form a 25mm expansion joint between the middle groove. The middle layer is laid with 25 / 20 and 25 / 60 bricks in 3 layers with dry masonry staggered joints ≤1mm. The gap between permanent layer (104) and working layer (105) is filled with magnesia ash.

[0061] The third stage: Modular construction of the alloy feeding port includes positioning of composite bricks, integration of chutes, and protection of infrared probes. The positioning of composite bricks involves cutting and pre-laying 8 BTH-T bricks with height matching the design value, and implementing a three-point centering method for positioning with a center deviation of ≤1mm. Two layers of wet-laid BTH-J composite bricks are used with a misalignment of ≤0.3mm. The chutes are integrated by laying 30mm calcium silicate board on the sloping steel structure, bonding it with fire mortar, and laying BTH-B bricks to form an arc base surface. The highest point is filled with magnesium chromium ramming material. BTH-A chute bricks are installed coaxially with BTH-J composite bricks with a hole diameter of 416±0.5mm. The infrared probe protection involves processing bricks on the 21st working layer 105 to wrap the probe, and filling the gaps with magnesium chromium fire mortar to ensure airtightness.

[0062] Phase 4: Closure and Expansion Control includes the top structure and expansion joint treatment. The closure of the top structure involves attaching only calcium silicate board 102 to the insulation layer after the 27th layer, filling the gap between it and the working layer 105 with rammed earth material, and building the top layer with BTS-2 processed bricks. The surface flatness is ≤1mm / 2m. The expansion joint treatment involves leaving a 55mm gap between the top surface of the working layer 105 and the upper groove flange 106, and filling it in layers with ceramic fiber felt 107, while the compression rate is ≥30%.

[0063] 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 multi-layer composite masonry structure of RH top vessel, comprising a RH top vessel body (1), characterized in that, The RH furnace upper tank body (1) is sequentially provided with a brick supporting plate (101), a heat preservation layer, light bricks (103), a permanent layer (104) and a working layer (105) from outside to inside, the top of the RH furnace upper tank body (1) is provided with an upper tank flange (106), the outside of the upper tank flange (106) is provided with a filling fiber felt (107), the top of one side of the RH furnace upper tank body (1) is provided with a feeding pipe (2), the feeding end of the feeding pipe (2) is an alloy feeding port, the connecting end of the feeding pipe (2) and the RH furnace upper tank body (1) is provided with a connecting point (201), the feeding end of the feeding pipe (2) is provided with a positioning batten (202), the middle position inside the feeding pipe (2) is provided with a feeding pipe center line (203), and the inner wall of the feeding pipe (2) is provided with an alloy feeding port module. The heat preservation layer comprises silicon-calcium plates (102) and light high-aluminum heat insulation bricks from top to bottom, and the number of the light high-aluminum heat insulation bricks is eleven layers, and the permanent layer (104) comprises magnesium-chrome bricks, and the number of the magnesium-chrome bricks is eleven layers. The bottom of the feeding pipe (2) is provided with a movable hole (204) extending into the inside of the feeding pipe (2) at a position close to the RH furnace upper tank body (1), the outside of the feeding pipe (2) is provided with a protective cover (3), the inside of the protective cover (3) is provided with a vibrating plate (301) extending into the inside of the movable hole (204), one end of the feeding pipe (2) is provided with a motor (302), the output end of the motor (302) is provided with a gear (303), one side of the inside of the vibrating plate (301) is rotatably connected with a rotating shaft (305), the outside of the rotating shaft (305) is provided with a triangular linkage block (306), and the protective cover (3) and the feeding pipe (2) are provided with an elastic member.

2. A multi-layer composite masonry structure for RH top slot according to claim 1, characterized in that, The vibrating plate (301) is movably connected with the feeding pipe (2) through the movable hole (204), and the inner wall of the vibrating plate (301) extends to the inside of the feeding pipe (2).

3. The multi-layer composite masonry structure of RH top slot according to claim 1, characterized in that, The rotating shaft (305) is rotatably connected with the vibrating plate (301) through a bearing, and the outside of the gear (303) and the triangular linkage block (306) is sleeved with a chain belt (304).

4. The multi-layer composite masonry structure of RH top slot according to claim 1, characterized in that, The gap between the heat preservation layer and the working layer (105) is controlled to be 3mm.

5. The multi-layer composite masonry structure of RH top slot according to claim 1, characterized in that, The working layer (105) comprises magnesium-chrome bricks, and the magnesium-chrome bricks are combined by bottom layer vertical laying, middle layer horizontal laying and top layer BTS-2 bricks.

6. The multi-layer composite masonry structure of RH top slot according to claim 1, characterized in that, The alloy feeding port module is combined by a BTH-T adjusting brick, a BTH-J combined brick and a BTH-A / B chute brick.

7. A precise construction method of a multi-layer composite masonry structure of a RH top slot, characterized in that, The precise construction method of the RH furnace upper tank multi-layer composite masonry structure comprises the following steps: Step one, precise positioning of the brick supporting plate (101): a 160mm*15mm brick supporting plate (101) is welded at 380mm on the upper surface of the fourth layer of the shell, and vertical welding is added with reinforcement; Step two, staggered masonry method: the gap between each layer of the heat preservation layer and the permanent layer (104) is greater than 1 / 2 brick length, and the working layer (105) is horizontally and vertically alternately laid; Step three, alloy port centering method: the center offset of the alloy feeding port is less than 5m; Step four, infrared probe protection process: when the brick is built to the probe position, process the brick, and fill the gap with magnesium-chromium fire mud for sealing.

8. The method according to claim 7, wherein the method is characterized by, The alloy mouth centering method comprises the following steps: 1, fixing a radius positioning stick (202) on a metal cylinder construction platform; 2, welding a steel pipe after centering the upper groove and the steel shell connecting point (201); 3, centering the cylinder midpoint and the steel shell connecting point (201) to find the center line of the discharge port; and 4, rechecking the deviation to be less than or equal to 1 mm.

9. The method for precise construction of RH top slot multi-layer composite masonry structure according to claim 7, characterized in that, The vertical angle of the vertical reinforcement is controlled to be 0°-0.5°.

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