Closed blast furnace iron slag treatment system

Abstract

A closed blast furnace iron slag treatment system belongs to the field of water quenching of iron slag in blast furnace ironmaking, and comprises a water quenching pool and a closed iron slag water quenching chamber, a plurality of iron slag receiving and conveying devices arranged in parallel are arranged under water of the water quenching pool, an iron slag throwing wheel is arranged on an iron slag discharging track of an iron slag discharging channel, and the iron slag throwing wheel rotates in the rotating process. The iron slag discharged by the iron slag discharge channel is thrown upwards and falls into the water quenching pool after penetrating through at least two water mist layers, and each water mist layer is a cooling water layer formed by collision of cooling water sprayed by a circle of atomized water spray pipes distributed at the same height in the iron slag water quenching chamber; water spraying seams for spraying cooling water in the diameter direction of the iron slag throwing wheel are distributed in the edge of the end of a blade of the iron slag throwing wheel. The iron slag can repeatedly penetrate through the water mist layer for multiple times in the process that the iron slag is thrown away, ascends firstly and then freely falls, rapid cooling is achieved, the iron slag finally falls into the water quenching pool, and it is also guaranteed that water quenching is fully carried out.

Description

Technical Field

[0001] The invention relates to the field of treatment of iron slag produced by blast furnace ironmaking, and in particular to a closed blast furnace iron slag treatment system. Background Art

[0002] In the prior art, the iron slag produced by blast furnace ironmaking is generally water quenched, that is, the high-temperature liquid iron slag is poured into a water pool or quenched and granulated by high-pressure water impact to form granulated blast furnace slag.

[0003] However, during the water quenching treatment, a large amount of high-temperature water vapor will be generated when the cooling water comes into contact with the high-temperature liquid iron slag, which not only wastes a lot of water resources, but also causes great damage to the environment because the water slag vapor contains a large amount of harmful elements such as sulfides and chlorides. A large amount of harmful elements such as sulfides also cause great harm to the health of regional workers. Moreover, the fine particles contained in the steam will cause corrosion to surrounding buildings, parked vehicles, etc. after falling.

[0004] Because steam contains a large amount of harmful substances, even if it is recycled it will lead to an increase in the subsequent maintenance costs of the recycling equipment. Therefore, most companies discharge it in the open air.

[0005] There are also some technologies that use water quenching in a closed environment to reduce pollution and damage to the surrounding environment. For example, the slag water quenching system disclosed in the utility model patent with application number 201822038213.X, and the blast furnace water quenching slag steam treatment device and slag steam treatment process disclosed in the invention patent with application number 202210572202.8, both place the water quenching pool of the iron slag in a closed environment. Although this method can effectively prevent the pollution of the surrounding environment by harmful substances in the steam and can also recycle water vapor, the use of cooling water immersion still has the problems of high water consumption and long water quenching time. Summary of the invention

[0006] In order to solve the problems of long quenching time and high water consumption in the water quenching method for treating iron slag in the prior art, the present invention provides a closed blast furnace iron slag treatment system, which, in a closed room, has the iron slag hit and thrown into the air by a slag flywheel, and then falls into a water quenching pool after cooling through a water mist layer, thereby converting the molten iron slag into small-sized iron slag and rapidly cooling it. Compared with direct water quenching, the water quenching efficiency can be effectively improved and the water consumption can be reduced to a certain extent.

[0007] The technical solution adopted by the present invention to solve the above technical problems is: a closed blast furnace slag treatment system, including a water quenching pool and a closed slag water quenching chamber, the water quenching pool is provided with a plurality of parallel slag receiving and conveying devices, one side of the slag water quenching chamber is provided with a slag discharge groove connected to the blast furnace slag discharge port, a slag throwing wheel is provided on the slag discharge track of the slag discharge groove, and the slag throwing wheel throws the slag discharged from the slag discharge groove upward during the rotation process, and falls into the water quenching pool after passing through at least two layers of water mist, each layer of the water mist layer is formed by the collision of cooling water sprayed from a circle of atomizing water nozzles distributed at the same height in the slag water quenching chamber; the blade end edge of the slag throwing wheel is provided with water spraying slots for spraying cooling water along the diameter direction of the slag throwing wheel.

[0008] As an optimization scheme for the above-mentioned closed blast furnace slag treatment system, the water quenching pool includes a water quenching area inside the slag water quenching chamber and a heat dissipation area outside the slag water quenching chamber, and the two areas are connected by a channel at the bottom of the slag water quenching chamber, and the channel is immersed in water to form a water-sealed connecting part; the multiple slag receiving and conveying devices arranged in parallel are located in the water quenching area, and the conveying ends of these slag receiving and conveying devices all extend to above a slag merging and conveying device, and the slag merging and conveying device conveys the slag out of the water quenching pool.

[0009] As another optimization scheme for the above-mentioned closed blast furnace slag treatment system, the slag flywheel includes a cylindrical rotor body and a plurality of blades distributed around the circumference of the rotor body, each blade is distributed along the axial direction of the rotor body, a water collecting chamber is arranged in the rotor body, and the water spraying slots on each blade can be connected with the water collecting chamber; the rotor body is driven to rotate by a hollow shaft, and the two ends of the hollow shaft are respectively connected with the cooling water pipe through rotating joints, so that the pressurized cooling water in the cooling water pipe can enter the water collecting chamber through the cooling water channel in the hollow shaft.

[0010] As another optimization scheme for the above-mentioned closed blast furnace slag processing system, a driving gear is provided on at least one side of the hollow shaft, and the driving gear is meshed with a transmission gear to transmit the rotational power of the power mechanism to the hollow shaft; protective covers are provided at both axial ends of the rotor body to place the hollow shaft, rotating joint, cooling water pipe, driving gear and transmission gear in the protective cover.

[0011] As another optimization scheme for the above-mentioned closed blast furnace slag processing system, a support shaft is arranged in the hollow shaft, and the two ends of the support shaft are respectively passed through the water inlet ends of the two rotating joints and then fixed, and a sealing connecting pipe is arranged on the water inlet end of the rotating joint, which is connected with the cooling water pipe by the sealing connecting pipe; a sealing pad is arranged on the inner wall of the water collecting chamber, and the sealing pad is fixedly connected to the support shaft by a number of positioning rods, so that when the blades rotate with the hollow shaft to a position where they do not contact the slag, the water spraying seams on the blades and the connecting channels of the water collecting chamber are blocked, so that the blades spray water intermittently.

[0012] As another optimization scheme for the above-mentioned closed blast furnace slag processing system, the blade is rectangular, and the surface in contact with the slag is an arc-shaped striking slope surface that is high in the middle and low on both sides. The thickness of the blade gradually decreases from the end in contact with the impeller body to the edge.

[0013] As another optimization scheme for the above-mentioned closed blast furnace slag treatment system, at least two layers of water vapor intercepting mechanisms are arranged above the slag water quenching chamber, and each layer of water vapor intercepting mechanisms gradually decreases from the center to the edge; a plurality of liquid collecting mechanisms are arranged at the edge of each layer of the water vapor intercepting mechanisms.

[0014] As another optimization scheme for the above-mentioned closed blast furnace slag treatment system, the water vapor interception mechanism is a multi-layer mesh structure, including a water-absorbing net made of polymer water-absorbing fibers and metal wire mesh layers attached to the upper and lower surfaces of the water-absorbing net.

[0015] As another optimization scheme for the above-mentioned closed blast furnace slag processing system, an elastic baffle is obliquely arranged on the trajectory of the slag flying upwards. The elastic baffle is a closed arc made of elastic metal sheet and has an angle of at least 90° with the slag flying trajectory.

[0016] As another optimization scheme for the above-mentioned closed blast furnace slag treatment system, a negative pressure exhaust device is arranged outside the slag water quenching chamber, and the exhaust pipe of the negative pressure exhaust device extends into the underwater part of the water quenching pool outside the slag water quenching chamber, and the air inlet pipe of the negative pressure exhaust device is connected to a plurality of suction branch pipes arranged at different positions on the top of the slag water quenching chamber.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) In the present invention, in a closed room, the iron slag is hit and thrown into the air by the iron slag throwing wheel, and then falls into the water quenching pool after passing through the water mist layer to cool down, thereby converting the molten iron slag into small-size iron slag and then quickly cooling it down. Compared with direct water quenching, the efficiency of water quenching can be effectively improved, and the water consumption can be reduced to a certain extent; at least two layers of water mist are located at different heights in the water quenching room, so that after being thrown, the iron slag first rises and then falls freely, and can repeatedly pass through the water mist layer for many times, thereby achieving rapid cooling, and finally falling into the water quenching pool, which also ensures that the water quenching is fully carried out. Compared with direct water quenching, the efficiency of water quenching can be effectively improved, and the water consumption can be reduced to a certain extent;

[0019] 2) The blades of the iron slag flywheel of the present invention are provided with water spraying slots, and the sprayed cooling water can not only form a water curtain in the air in the water quenching chamber that directly impacts the iron slag, but most importantly, can cool the blades to prevent the temperature from rising and causing the adhesion of molten iron slag; and the support shaft and the sealing pad are arranged to realize intermittent water spraying of the blades, which can reduce the consumption of cooling water; the blades adopt an arc-shaped flying slope, and the thickness gradually decreases from the end in contact with the wheel body to the edge, which can make the iron slag flying from different positions of the blade diffuse to the surroundings, so as to fully disperse a mass of iron slag and prevent the agglomeration and accumulation of the iron slag landing point;

[0020] 3) The water quenching pool of the present invention is divided into two parts: a water quenching zone in the iron slag water quenching chamber and an external heat dissipation zone, which can utilize external natural conditions to dissipate heat from cooling water; and the water vapor interception mechanism arranged in the iron slag water quenching chamber can absorb and liquefy most of the water vapor generated by high temperature, and then discharge it separately by relying on the liquid collecting mechanism, thereby minimizing the erosion of harmful substances in the high-temperature steam on the equipment; the negative pressure exhaust equipment arranged can, on the one hand, promote the water vapor to rise and then contact with the water vapor interception mechanism for adsorption and liquefaction, and on the other hand, promote the air flow circulation in the iron slag water quenching chamber to reduce the internal temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the slag throwing flywheel, the supporting shaft and the rotating joint;

[0023] Figure 3 This is a schematic diagram of the internal structure of the slag throwing flywheel;

[0024] Figure 4 It is a schematic diagram of the end face of the iron slag throwing flywheel;

[0025] Figure 5 It is a schematic cross-sectional view of the slag throwing flywheel blade;

[0026] Figure 6It is a schematic diagram of power transmission of the support shaft, rotary joint and hollow shaft;

[0027] Figure 7 It is a schematic diagram of the cross-sectional structure of the water vapor interception mechanism;

[0028] Figure 8 is a structural schematic diagram of a liquid collecting mechanism;

[0029] Figure numerals: 1, water quenching tank, 101, water quenching zone, 102, heat dissipation zone, 103, iron slag receiving and conveying device, 104, iron slag merging and conveying device, 105, water seal connecting part, 2, iron slag water quenching chamber, 201, atomizing water nozzle, 202, inclined baffle, 203, elastic baffle, 204, negative pressure exhaust equipment, 205, exhaust pipe, 206, air inlet pipe, 207, air suction branch pipe, 208, protective cover, 3, iron slag discharge groove, 4, iron slag throwing flywheel, 401, blade, 402, water spraying slot, 403, wheel body, 404, water collecting chamber, 405, striking slope, 5, water vapor intercepting mechanism, 501, metal wire mesh layer, 502, water absorption net, 6, liquid collecting mechanism, 601, liquid collecting pipe, 602, liquid guiding sheet, 603, collecting pipe, 604, liquid inlet hole, 7, hollow shaft, 701, driving gear, 702, transmission gear, 8, supporting shaft, 801, bracket, 802, sealing pad, 803, positioning rod, 804, supporting pad, 9, rotating joint, 901, sealing pipe, 902, cooling water pipe, 903, cooling water channel. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is explained in detail below in conjunction with specific embodiments. The parts not explained in the following embodiments of the present invention are regarded as the prior art that those skilled in the art know or should know, such as the selection and installation of the rotary joint model, how to seal the contact point between the rotary joint and the support shaft, how to pressurize the cooling water so that it enters the rotary joint and sprays it out from the water spray gap of the blade, etc.

[0031] Example 1

[0032] A closed blast furnace slag treatment system, such as Figure 1As shown, it includes a water quenching pool 1 and a closed slag water quenching chamber 2. The water quenching pool 1 is formed by cement masonry. The slag water quenching chamber 2 is a closed plant built on one side of the water quenching pool 1 and covers half of the water quenching pool 1. The area of ​​the water quenching pool 1 is designed according to the capacity of the blast furnace and the amount of slag produced. The area and height of the slag water quenching chamber 2, the rotation speed of the slag flywheel 4 and the amount of slag produced are designed. The water of the water quenching pool 1 has a plurality of parallel slag receiving and conveying devices 103. The slag receiving and conveying devices 103 use existing chain plate conveyors that can run underwater, and the plurality of chain plate conveyors are arranged in parallel, so as to cover the bottom of the slag water quenching chamber 2. , which is used to receive and transfer the slag out of the slag water quenching chamber 2. In practice, it is necessary to set a slag merging conveying device 104 at the tail end of these slag receiving and conveying devices 103, which is perpendicular to and below all the slag receiving and conveying devices 103, so that all the discharged slag can be gathered on the slag merging conveying device 104 and then transported out for centralized treatment. The slag merging conveying device 104 also adopts a chain plate conveyor that can run underwater. A slag discharge ditch 3 connected to the blast furnace slag discharge port is provided on one side of the slag water quenching chamber 2. The slag discharge ditch 3 is formed by casting refractory materials, connected to the blast furnace slag discharge port, and is arranged obliquely downward. , so that the slag can flow smoothly therein and provide the slag with an initial velocity in the horizontal direction forward. A slag flywheel 4 is arranged on the slag discharge track of the slag discharge groove 3. The slag flywheel 4 is located at a position obliquely below the slag discharge groove 3. During the rotation of the slag flywheel 4, the slag discharged from the slag discharge groove 3 is tilted upward and falls into the water quenching pool 1 after passing through at least two layers of water mist. Each layer of the water mist layer is formed by the collision of cooling water sprayed by a circle of atomized water nozzles 201 distributed at the same height in the slag water quenching chamber 2 to form a cooling water layer. The atomized water nozzle 201 adopts an existing nozzle to spray cooling water horizontally or slightly tilted upward. The size of the spray hole can be adjusted according to actual conditions, so as to control the spray amount of cooling water, and achieve the purpose of water saving while ensuring the formation of a water mist layer; an inclined baffle 202 is arranged above each atomizing water nozzle 201, which is mainly used to prevent the iron slag freely falling from a high place from adhering to the nozzle and then clogging the nozzle; the edge of the end of the blade 401 of the iron slag flywheel 4 is provided with a water spray slot 402 for spraying cooling water along the diameter direction of the iron slag flywheel 4, and the width of the water spray slot 402 is very narrow, so as to control the water spray amount, and the length of the water spray slot 402 is slightly smaller than the axial length of the blade 401, so that the sprayed cooling water forms a thin strip.

[0033] In this embodiment, if Figure 1As shown, the water quenching pool 1 includes a water quenching area 101 in the iron slag water quenching chamber 2 and a heat dissipation area 102 outside the iron slag water quenching chamber 2, and the two areas are connected through a channel at the bottom of the iron slag water quenching chamber 2, and the channel is immersed in water to form a water seal connecting part 105. The area of ​​the heat dissipation area 102 is much larger than the area of ​​the water quenching area 101. Moreover, the heat dissipation area 102 is set in the open air, and a sunshade can be set above it to prevent direct sunlight in summer. In addition, several cooling water pools can be added to the cooling water of the water quenching pool 1 for cooling. The circulation is connected to improve the heat dissipation speed of the cooling water in the water quenching pool 1; at this time, the multiple iron slag receiving and conveying devices 103 arranged in parallel are in the water quenching zone 101, the tail of the iron slag receiving and conveying device 103 extends out of the water seal connecting portion 105, and the conveying ends of these iron slag receiving and conveying devices 103 all extend to the top of an iron slag merging and conveying device 104, the iron slag merging and conveying device 104 is in the heat dissipation zone 102, and is inclined, so that the iron slag merging and conveying device 104 conveys the iron slag out of the water quenching pool 1.

[0034] In this embodiment, the slag flywheel 4 has two working modes, which can be switched and performed alternately or used separately:

[0035] Low-speed throwing mode: low rotation speed, low water pressure and low flow rate, that is, the slag throwing wheel 4 rotates at a low speed, and at the same time, the water pressure and flow rate of the cooling water sprayed from the water spraying slot 402 are low. At this time, the slag can penetrate the cooling water sprayed from the water spraying slot 402 and contact the blades 401. With the help of the rotation and striking of the slag throwing wheel 4, the slag is crushed and scattered. Experiments have shown that the rotation speed of the slag throwing wheel 4 in this mode is generally 30-100rpm, and the flow rate of the water sprayed from the water spraying slot 402 is generally 1-5m / s.

[0036] High-speed impact mode: high rotation speed, high water pressure and high flow rate, that is, the slag flywheel 4 rotates at a high speed, and at the same time, the water pressure and flow rate of the cooling water sprayed from the water spray slot 402 are high. At this time, because the spraying speed of the cooling water is very high and the rotation speed of the slag flywheel 4 is also high, the cooling water sprayed from the water spray slot 402 forms a high-speed outward-expanding "water wall" around the outside of the slag flywheel 4 under the combined action of centrifugal force and initial velocity. The molten slag cannot penetrate the "water wall" and release from the blades 401, but is impacted to fly obliquely upward when contacting the "water wall", thereby improving the effect of water quenching. The rotation speed of the slag flywheel 4 in this mode is generally above 500rpm, and the flow rate of the water sprayed from the water spray slot 402 is generally above 12m / s. The higher the rotation speed of the slag flywheel 4 and the greater the flow rate of the water, the higher the contact point between the slag and the "water wall".

[0037] In this embodiment, if Figure 2 , Figure 3 and Figure 4As shown, the slag flywheel 4 includes a cylindrical rotor body 403 and a plurality of blades 401 distributed around the circumference of the rotor body 403. The rotor body 403 and the blades 401 are made of high temperature resistant and wear-resistant steel materials. The rotor body 403 has a certain length along its axial direction, which should exceed the distribution width of the slag when it falls, and generally should be at least 1.5 times the distribution width. The number of blades 401 is generally 6-12, each blade 401 is distributed along the axial direction of the rotor body 403, a water collecting chamber 404 is provided in the rotor body 403, and the water spraying slots 402 on each blade 401 can be connected to the water collecting chamber 404; the rotor body 403 is driven to rotate by a hollow shaft 7, and the two ends of the hollow shaft 7 are respectively connected to the cooling water pipe 902 through a rotary joint 9, so that the pressurized cooling water in the cooling water pipe 902 enters the water collecting chamber 404 through the cooling water channel 903 in the hollow shaft 7;

[0038] The hollow shaft 7 is fixed by rotation by existing equipment such as bearings and supports, so as to support the slag flywheel 4 in the air and keep a certain distance from the water surface of the water quenching tank 1; Figure 2 and Figure 6 As shown, a driving gear 701 is fixedly installed on one side of the hollow shaft 7, and the driving gear 701 is meshed with a transmission gear 702 to transmit the rotational power of the power mechanism to the hollow shaft 7, and the power mechanism is a reducer driven by a motor; protective covers 208 are provided at both ends of the axial direction of the runner body 403 to place the hollow shaft 7, the rotary joint 9, the cooling water pipe 902, the driving gear 701 and the transmission gear 702 in the protective cover 208, and the protective cover 208 is made of metal, and its purpose is to prevent iron slag from adhering to and corroding the above-mentioned equipment;

[0039] In this embodiment, the blade 401 is preferably in a rectangular shape. Figure 3 and Figure 5 As shown, one surface in contact with the iron slag is an arc-shaped knock-off slope 405, which forms an arc-shaped surface with a high middle and low sides from both sides in the axial direction of the impeller body 403 to the center, and the other surface of the blade 401 opposite to the arc-shaped knock-off slope 405 can be a plane or a curved surface; at the same time, the thickness of the blade 401 gradually decreases from the side in contact with the impeller body 403 to the edge with the water spray gap 402.

[0040] The above is a basic implementation of the present invention, and further improvements and optimizations can be made on the above basis to obtain the following embodiments:

[0041] Example 2

[0042] This embodiment is an improved solution based on the embodiment 1, and its main structure is the same as that of the embodiment 1, except that: Figure 2 and3 As shown, a support shaft 8 arranged concentrically therewith is arranged in the hollow shaft 7, and the two ends of the support shaft 8 are respectively passed through the water inlet ends of the two rotary joints 9 and are fixed by existing equipment such as bearings and bearing seats. A sealing pipe 901 is arranged on the water inlet end of the rotary joint 9, which is connected with the cooling water pipe 902 by the sealing pipe 901. The sealing pipe 901 is sealed by the existing sealing measures, and its core is to ensure the sealing of the contact position between the support shaft 8 and the rotary joint 9 and the sealing pipe 901 to prevent the leakage of cooling water with very high pressure; the inner wall of the water collecting chamber 404 is provided with a sealing pad 802, and the sealing pad 802 is made of arc-shaped semi-cylinder wear-resistant rubber, and the central angle corresponding to the arc is generally 180-240°. The plugging pad 802 is fixedly connected to the support shaft 8 by a number of positioning rods 803, so that when the blades 401 rotate with the hollow shaft 7 to a position where they are not in contact with the iron slag, the connection channels between the water spraying slits 402 on the blades 401 and the water collecting chamber 404 are blocked, so that the blades 401 spray water intermittently. The plugging pad 802 can be plugged not only by the support of the positioning rods 803, but also by the water pressure after the cooling water is introduced, so that even if the plugging is not tight, it will not affect the use effect. Figure 3 As shown, there are a number of support pads 804 at positions opposite to the sealing pad 802 in the water collecting chamber 404, and these support pads 804 are also fixed on the support shaft 8 through positioning rods 803, thereby ensuring that the support shaft 8 is in stable contact with the inner wall of the water collecting chamber 404 through these positioning rods 803 surrounding it; the position where the water spray seam 402 is connected to the water collecting chamber 404 is a small hole, and from the small hole to the edge of the blade 401, its width gradually increases, thereby forming a flat trumpet shape.

[0043] Example 3

[0044] This embodiment is another improved solution based on the embodiment 1. Its main structure is the same as that of the embodiment 1, except that: Figure 1 As shown, at least two layers of water vapor intercepting mechanisms 5 are arranged above the slag water quenching chamber 2, and each layer of water vapor intercepting mechanisms 5 is gradually lowered from the center to the edge, and at least one support rod connected to the roof is arranged at the center to hang the water vapor intercepting mechanism 5, and support rods can be arranged at other positions according to actual conditions; a plurality of liquid collecting mechanisms 6 are arranged at the edge of each layer of the water vapor intercepting mechanism 5.

[0045] In this embodiment, the water vapor interception mechanism 5 is a multi-layer mesh structure, such as Figure 7As shown, it includes a water-absorbing net 502 made of polymer water-absorbing fibers and a metal mesh layer 501 attached to the upper and lower surfaces of the water-absorbing net 502. The water-absorbing net 502 is a mesh structure with a certain thickness formed by stacking many layers of water-absorbing fiber mesh, which is generally about 1 cm. The metal mesh layer 501 is also a mesh structure with a certain thickness formed by stacking many layers of mesh woven by metal wires, but its thickness is smaller than that of the water-absorbing net 502. It is used not only to support the weight of the water-absorbing net 502, but more importantly, to guide the water droplets absorbed and condensed by the water-absorbing net 502.

[0046] like Figure 8 As shown, each of the liquid collecting mechanisms 6 includes a liquid guiding piece 602 vertically arranged at a position of the water vapor intercepting mechanism 5 near the side wall of the slag water quenching chamber 2 and a liquid collecting pipe 601 obliquely penetrating the side wall of the slag water quenching chamber 2, the bottom of the liquid guiding piece 602 is a V-shaped slope inclined from both sides to the middle, the higher end of the liquid collecting pipe 601 has a liquid inlet hole 604 corresponding to the lowest point of the V-shaped slope at the bottom of the liquid guiding piece 602, and the lower end of the liquid collecting pipe 601 is inserted into the collecting pipe 603 outside the slag water quenching chamber 2; after the water absorption net 502 absorbs enough water vapor, the water vapor generated by condensation flows downward along the metal wire mesh layer 501, and after being blocked by the liquid guiding piece 602, flows along the bottom of the liquid guiding piece 602 into the liquid collecting pipe 601, and finally gathers into the collecting pipe 603 arranged around the outer wall of the slag water quenching chamber 2, so that the harmful substances contained in the water vapor can be centrally treated.

[0047] In this embodiment, a negative pressure exhaust device 204 may be further provided outside the iron slag water quenching chamber 2, such as Figure 1 As shown, the exhaust pipe 205 of the negative pressure exhaust device 204 extends into the underwater part of the water quenching pool 1 outside the iron slag water quenching chamber 2, and the air inlet pipe 206 of the negative pressure exhaust device 204 is connected to a plurality of suction branches 207 arranged at different positions on the top of the iron slag water quenching chamber 2.

[0048] Example 4

[0049] This embodiment is another improved solution based on the embodiment 1. Its main structure is the same as that of the embodiment 1, except that: Figure 1 As shown, an elastic baffle 203 is obliquely arranged on the trajectory of the slag flying upwards. The elastic baffle 203 is a closed arc made of elastic metal sheet and has an angle of at least 90° with the slag flying trajectory, so that the height of the slag water quenching chamber 2 can be appropriately reduced.

[0050] Taking the blast furnace slag treatment requirements of our company as the background, the treatment method of the slag in the present invention is described in detail:

[0051] During the iron-making production process, the blast furnace will continuously discharge high-temperature iron slag. The closed blast furnace iron slag treatment system involved in the present invention mainly includes a water quenching pool 1 and a closed iron slag water quenching chamber 2. A plurality of parallel iron slag receiving and conveying devices 103 are arranged underwater in the water quenching pool 1. These devices are used to receive the iron slag falling from the iron slag water quenching chamber 2 into the water quenching pool 1 and convey it to the subsequent processing area; a slag discharge ditch 3 connected to the blast furnace slag discharge port is arranged on one side of the iron slag water quenching chamber 2, and the iron slag discharged from the blast furnace enters the iron slag water quenching chamber 2 through the discharge ditch; a key component iron slag flywheel 4 is arranged on the iron slag discharge track of the iron slag discharge ditch 3, and the iron slag flywheel 4 can throw the iron slag discharged from the iron slag discharge ditch 3 upward during rotation;

[0052] Specifically, the slag flywheel 4 includes a cylindrical rotor body 403 and a plurality of blades 401 distributed around the circumference of the rotor body 403, and each blade 401 is distributed along the axial direction of the rotor body 403. A water collecting chamber 404 is provided in the rotor body 403, and a water spraying slot 402 on each blade 401 is connected to the water collecting chamber 404. The rotor body 403 is driven to rotate by the hollow shaft 7, and both ends of the hollow shaft 7 are connected to the cooling water pipe 902 through the rotary joint 9 respectively. The pressurized cooling water in the cooling water pipe 902 enters the water collecting chamber 404 through the cooling water channel 903 in the hollow shaft 7, and then sprays out from the water spraying slot 402 of the blade 401;

[0053] In order to realize the rotation of the hollow shaft 7, a driving gear 701 is arranged on one side of the hollow shaft 7, and the driving gear 701 is meshed with the transmission gear 702 for transmission. The rotational power of the power mechanism is transmitted to the hollow shaft 7 through this meshing transmission mode, thereby driving the iron slag flywheel 4 to rotate. At the same time, a protective cover 208 is arranged at both ends of the axial direction of the wheel body 403, and the hollow shaft 7, the rotary joint 9, the cooling water pipe 902, the driving gear 701 and the transmission gear 702 are all placed in the protective cover 208, which plays a role in protection and preventing iron slag and water vapor erosion.

[0054] A support shaft 8 is arranged inside the hollow shaft 7, and the two ends of the support shaft 8 are respectively passed through the water inlet ends of the two rotary joints 9 and then fixed. A sealing pipe 901 is arranged on the water inlet end of the rotary joint 9, and is connected with the cooling water pipe 902 by means of the sealing pipe 901. A blocking pad 802 is arranged on the inner wall of the water collecting chamber 404, and the blocking pad 802 is fixedly connected to the support shaft 8 by a plurality of positioning rods 803. When the blade 401 rotates with the hollow shaft 7 to a position where it does not contact the iron slag, the water spraying seam 402 on the blade 401 and the connecting channel of the water collecting chamber 404 are blocked, so that the blade 401 can spray water intermittently. A plurality of support pads 804 are arranged at a position opposite to the blocking pad 802 in the water collecting chamber 404, and these support pads 804 are also fixed on the support shaft 8 by positioning rods 803 to ensure the stability of the support shaft 8.

[0055] The position where the water spraying slot 402 connects with the water collecting chamber 404 is a small hole, and from the small hole to the edge of the blade 401, its width gradually increases to form a flat trumpet shape. Such a design helps to improve the uniformity and coverage of the water spray. The blade 401 is designed to be rectangular, and the surface in contact with the iron slag is an arc-shaped flying slope 405 that is high in the middle and low on both sides. The thickness of the blade 401 gradually decreases from the end in contact with the runner body 403 to the edge. This special shape design allows the iron slag to be thrown to different positions when it contacts the blade 401, making full use of the space of the entire water quenching chamber, and fully contacting with the cooling water on the blade 401 during the throwing process to achieve a better cooling effect.

[0056] In the slag water quenching chamber 2, the slag flywheel 4 throws the slag upward, and the slag needs to rise through at least two layers of water mist and then freely fall through these water mist layers, and finally fall into the water quenching pool 1. Each layer of water mist is formed by the collision of cooling water sprayed by a circle of atomizing water nozzles 201 distributed at the same height in the slag water quenching chamber 2. Through the design of this multi-layer water mist layer, the cooling effect on the slag is further enhanced, ensuring that the slag is fully cooled before falling into the water quenching pool 1.

[0057] The water quenching pool 1 includes a water quenching zone 101 in the iron slag water quenching chamber 2 and a heat dissipation zone 102 outside the iron slag water quenching chamber 2. The two zones are connected by a channel at the bottom of the iron slag water quenching chamber 2, and the channel is submerged in water to form a water seal connection 105. A plurality of iron slag receiving and conveying devices 103 arranged in parallel are located in the water quenching zone 101. The conveying ends of these iron slag receiving and conveying devices 103 all extend above an iron slag merging and conveying device 104, and the iron slag merging and conveying device 104 conveys the iron slag out of the water quenching pool 1. In the water quenching zone 101, the iron slag is fully in contact with water to complete the water quenching process, and then the iron slag after water quenching is conveyed to a subsequent processing step through the iron slag receiving and conveying device 103 and the iron slag merging and conveying device 104. The heat dissipation zone 102 is used to dissipate the heat of the water after water quenching, so that the water can be recycled and the production cost can be reduced.

[0058] At least two layers of water vapor interception mechanisms 5 are arranged above the slag quenching chamber 2, and each layer of water vapor interception mechanisms 5 is gradually lowered from the center to the edge. A number of liquid collecting mechanisms 6 are arranged at the edge of each layer of water vapor interception mechanisms 5; the water vapor interception mechanism 5 is a multi-layer mesh structure, including a water absorbent net 502 made of polymer water absorbent fibers and a metal wire mesh layer 501 attached to the upper and lower surfaces of the water absorbent net 502. The water absorbent net 502 made of polymer water absorbent fibers can effectively absorb the water vapor generated during the slag quenching process, and the metal wire mesh layer 501 plays a role in enhancing the structural strength and protecting the water absorbent net 502. Each liquid collecting mechanism 6 includes a liquid guide plate 602 vertically arranged at the water vapor interception mechanism 5 near the side wall of the slag quenching chamber 2 and a liquid collecting pipe 601 obliquely penetrating the side wall of the slag quenching chamber 2. The bottom of the liquid guide plate 602 is a V-shaped slope inclined from both sides to the middle, and the higher end of the liquid collecting pipe 601 has a liquid inlet hole 604 corresponding to the V-shaped slope at the bottom of the liquid guide plate 602, and the lower end of the liquid collecting pipe 601 is inserted into the collecting pipe 603 outside the iron slag water quenching chamber 2. When the water vapor intercepting mechanism 5 absorbs water vapor, the water vapor will gather into water droplets, which will flow into the liquid inlet hole 604 of the liquid collecting pipe 601 along the V-shaped slope of the liquid guide plate 602, and then flow into the collecting pipe 603 through the liquid collecting pipe 601, so as to realize the collection and treatment of water vapor, prevent water vapor from escaping from the iron slag water quenching chamber 2, and reduce environmental pollution.

[0059] An elastic baffle 203 is tilted on the trajectory of the slag flying upwards. The elastic baffle 203 is a closed arc made of an elastic metal sheet and has an angle of at least 90° with the slag flying trajectory. The elastic baffle 203 can change the flying trajectory of the slag, so that the slag can fully contact with the water mist and cooling water in the water quenching chamber, further improving the cooling effect, and effectively controlling the flying height of the slag, thereby reducing the height of the water quenching chamber.

[0060] A negative pressure exhaust device 204 is arranged outside the iron slag water quenching chamber 2, and an exhaust pipe 205 of the negative pressure exhaust device 204 extends into the underwater part of the water quenching pool 1 outside the iron slag water quenching chamber 2, and an air inlet pipe 206 of the negative pressure exhaust device 204 is connected with a plurality of air suction branches 207 arranged at different positions on the top of the iron slag water quenching chamber 2. The negative pressure exhaust device 204 extracts water vapor and harmful gases in the iron slag water quenching chamber 2 through the air suction branches 207, and discharges them into the underwater part of the water quenching pool 1, and uses water to purify these water vapor and harmful gases, thereby further reducing environmental pollution and ensuring the safety and sanitation of the production environment.

[0061] In actual operation, the high-temperature slag discharged from the blast furnace enters the slag water quenching chamber 2 through the slag discharge groove 3, and the slag flywheel 4 throws the slag upward to make it pass through multiple layers of water mist. During the throwing process, the water spraying slots 402 on the blades 401 spray water intermittently to cool the slag. The slag after preliminary cooling falls into the water quenching area 101 of the water quenching pool 1, completes the water quenching process in the water quenching area 101, and then the slag receiving and conveying device 103 and the slag merging and conveying device 104 convey the quenched slag out of the water quenching pool 1.

[0062] The water vapor and harmful gases generated during the slag water quenching process are collected and processed by the water vapor interception mechanism 5 and the liquid collection mechanism 6, and the negative pressure exhaust device 204 extracts the remaining water vapor and harmful gases for purification. The entire system realizes efficient cooling and environmentally friendly treatment of blast furnace slag, improves the quality and efficiency of slag treatment, reduces production costs, and reduces pollution to the environment.

Claims

1. A closed blast furnace slag treatment system, comprising a water quenching pool (1) and a closed slag water quenching chamber (2), wherein the water quenching pool (1) has a plurality of slag receiving and conveying devices (103) arranged in parallel under water, and a slag discharge ditch (3) connected to a blast furnace slag discharge port is arranged on one side of the slag water quenching chamber (2), characterized in that: A slag throwing wheel (4) is arranged on the slag discharge track of the slag discharge groove (3), and during the rotation process, the slag throwing wheel (4) throws the slag discharged from the slag discharge groove (3) upward, and falls into the water quenching pool (1) after passing through at least two layers of water mist, each layer of the water mist layer is formed by the collision of cooling water sprayed from a circle of atomizing water nozzles (201) distributed at the same height in the slag water quenching chamber (2) to form a cooling water layer; and a water spraying slot (402) for spraying cooling water along the diameter direction of the slag throwing wheel (4) is distributed at the edge of the end of the blade (401) of the slag throwing wheel (4).

2. A closed blast furnace slag treatment system according to claim 1, characterized in that: The water quenching pool (1) comprises a water quenching zone (101) located in a slag water quenching chamber (2) and a heat dissipation zone (102) located outside the slag water quenching chamber (2), and the two zones are connected via a channel at the bottom of the slag water quenching chamber (2), and the channel is submerged in water to form a water-sealed connecting portion (105); the plurality of slag receiving and conveying devices (103) arranged in parallel are located in the water quenching zone (101), and the conveying ends of the slag receiving and conveying devices (103) all extend above a slag merging and conveying device (104), and the slag merging and conveying device (104) conveys the slag out of the water quenching pool (1).

3. A closed blast furnace slag treatment system according to claim 1, characterized in that: The slag flywheel (4) comprises a cylindrical rotor body (403) and a plurality of blades (401) distributed around the circumference of the rotor body (403), each blade (401) being distributed along the axial direction of the rotor body (403), a water collecting chamber (404) being arranged in the rotor body (403), and a water spraying slot (402) on each blade (401) being able to communicate with the water collecting chamber (404); the rotor body (403) is driven to rotate by a hollow shaft (7), and both ends of the hollow shaft (7) are respectively connected to a cooling water pipe (902) through a rotating joint (9), so that the pressurized cooling water in the cooling water pipe (902) enters the water collecting chamber (404) through the cooling water channel (903) in the hollow shaft (7).

4. A closed blast furnace slag treatment system according to claim 3, characterized in that: A driving gear (701) is provided on at least one side of the hollow shaft (7), and the driving gear (701) meshes with a transmission gear (702) to transmit the rotational power of the power mechanism to the hollow shaft (7); protective covers (208) are provided at both axial ends of the rotating wheel body (403) to place the hollow shaft (7), the rotating joint (9), the cooling water pipe (902), the driving gear (701) and the transmission gear (702) in the protective covers (208).

5. A closed blast furnace slag treatment system according to claim 3, characterized in that: A support shaft (8) is arranged inside the hollow shaft (7), and the two ends of the support shaft (8) are respectively passed through the water inlet ends of the two rotating joints (9) and then fixed. A sealing pipe (901) is arranged on the water inlet end of the rotating joint (9), and is connected with the cooling water pipe (902) by means of the sealing pipe (901); a sealing pad (802) is arranged on the inner wall of the water collecting chamber (404), and the sealing pad (802) is fixedly connected to the support shaft (8) by a plurality of positioning rods (803), so that when the blades (401) rotate with the hollow shaft (7) to a position where they are not in contact with the iron slag, the water spraying slits (402) on the blades (401) and the connecting channels of the water collecting chamber (404) are blocked, so that the blades (401) spray water intermittently.

6. A closed blast furnace slag treatment system according to claim 3, characterized in that: The blade (401) is rectangular, and the surface in contact with the iron slag is an arc-shaped flying slope surface (405) that is high in the middle and low on both sides. The thickness of the blade (401) gradually decreases from the end in contact with the wheel body (403) to the edge.

7. A closed blast furnace slag treatment system according to claim 1, characterized in that: At least two layers of water vapor interception mechanisms (5) are arranged above the iron slag water quenching chamber (2), and each layer of water vapor interception mechanisms (5) gradually decreases from the center to the edge; and a plurality of liquid collecting mechanisms (6) are arranged at the edge of each layer of the water vapor interception mechanisms (5).

8. A closed blast furnace slag treatment system according to claim 7, characterized in that: The water vapor intercepting mechanism (5) is a multi-layer mesh structure, comprising a water-absorbing net (502) made of polymer water-absorbing fibers and metal wire mesh layers (501) attached to the upper and lower surfaces of the water-absorbing net (502).

9. The closed blast furnace slag treatment system according to claim 1, characterized in that: An elastic baffle (203) is obliquely arranged on the trajectory of the iron slag flying upwards. The elastic baffle (203) is a closed arc made of an elastic metal sheet and has an angle of at least 90° with the iron slag flying trajectory.

10. The closed blast furnace slag treatment system according to claim 1, characterized in that: A negative pressure exhaust device (204) is arranged outside the iron slag water quenching chamber (2); an exhaust pipe (205) of the negative pressure exhaust device (204) extends into the underwater part of the water quenching pool (1) outside the iron slag water quenching chamber (2); and an air inlet pipe (206) of the negative pressure exhaust device (204) is connected to a plurality of air suction branch pipes (207) arranged at different positions on the top of the iron slag water quenching chamber (2).

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