A device for preventing high-temperature slag particles from adhering and blocking

Abstract

The application discloses a device for preventing high-temperature slag particles from adhering and blocking, which comprises a granulating bin, a material-uniformizing and slag-breaking device and a moving bed. High-temperature liquid molten slag is centrifugally granulated into small droplets by a granulator, and cooling gas is arranged at the outer edge of the granulator. After being cooled by the edge cooling gas, the slag droplets fly to the wall surface of the granulating bin, and an edge wall air is arranged at the wall surface. A material-uniformizing and slag-breaking device is arranged in the middle of the granulating bin. A vertical heat exchange surface is arranged at the lower part of the granulating bin, and the heat exchange surface is provided with a soot-blowing device. The material-uniformizing and slag-breaking device is arranged at the upper part of the moving bed. A heat exchange tube bundle preventing dust accumulation is arranged in the middle of the moving bed. The bottom of the moving bed is a bulk material accumulation part, and a vibrating device is arranged. A discharging device is arranged at the outlet of the moving bed. The device can prevent the high-temperature slag particles from adhering to the wall, back heating and adhering, efficiently break the slag cotton generated in the granulating process, make the slag particles uniformly distributed in the granulating bin and the moving bed, prevent the slag particles from accumulating and blocking, and reduce accidents.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-temperature liquid slag waste heat recovery, and particularly relates to a device for preventing high-temperature slag particle adhesion and blockage. BACKGROUND

[0002] Blast furnace slag is a solid waste produced in the steel smelting process, and the tapping temperature is 1400-1550 DEG C. The heat energy carried by each ton of blast furnace slag is about 1770 MJ, equivalent to 60 kg of standard coal, and has great heat recovery potential. The traditional blast furnace slag treatment mainly adopts the water quenching method, which has the disadvantages of large water consumption, generation of SO2, H2S and other pollution gases, and waste of a large amount of waste heat.

[0003] The slag dry granulation and waste heat recovery technology is a treatment method for rapidly breaking and solidifying liquid slag into small particles under the premise of basically not consuming water resources, and using air as a heat storage medium to fully contact and exchange heat with the slag particles, so as to recover the waste heat. Among them, the centrifugal granulation method has the advantages of less energy consumption, good granulation effect, simple and compact equipment, and controllable particle size and morphology, and becomes the most promising slag treatment method.

[0004] At present, in the centrifugal granulation process of the slag, the liquid filaments broken out of the granulator are rapidly cooled to form slag wool, which is accumulated around the granulator, easily causing the motor to be stuck, and seriously affecting the operation of the equipment. In addition, the slag particles after centrifugation have high temperature, and the semi-molten slag particles are easily adhered to the wall surface of the granulation bin, causing heat exchange to be deteriorated. After the granulated slag particles rebound after hitting the wall, they are mostly distributed near the wall surface of the granulation bin, increasing the probability of adhesion of semi-molten slag particles, and seriously affecting the heat exchange efficiency of the system. Therefore, in order to ensure the safe and stable operation of the dry granulation system, it is necessary to enhance the heat exchange of the slag particles in the flying process before hitting the wall, clean the generated slag wool in time, and realize the uniform distribution of the slag particles in the granulation bin and the moving bed. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a device for preventing high-temperature slag particle adhesion and blockage, which solves the technical problem of harm caused by slag wool generation, slag particle adhesion, heat return, accumulation and blockage in the current high-temperature slag dry granulation process.

[0006] The application adopts the following technical scheme:

[0007] The application discloses a high-temperature slag particle adhesion and blockage prevention device, which comprises a granulator arranged at a central position of a granulation bin, a material uniformizing and slag breaking device arranged above the granulator, a material uniformizing device arranged below the granulator, a vertical heat exchange surface arranged outside the granulator, the vertical heat exchange surface being arranged between the material uniformizing and slag breaking device and the material uniformizing device, a heat exchange tube bundle arranged below the material uniformizing device, the heat exchange tube bundle being located in a middle part of a moving bed, a vibrating device arranged at a bottom of the moving bed, and a discharging device uniformly arranged at an outlet of the moving bed.

[0008] Specifically, cooling gas is arranged at the outer edge of the granulator, and the cooling gas adopts rotary spraying, direct current spraying or natural air outlet mode.

[0009] Specifically, air outlets of the granulator are uniformly distributed around the granulator, and air outlet directions of the air outlets deviate from the edges of the granulator and are outward.

[0010] Specifically, the upper wall surface of the granulation bin is provided with side wall air with adjustable incident angles, the inlet of the side wall air is arranged in the circumferential direction of the granulation bin, and the incident inlets in the vertical direction are in a multilayer structure.

[0011] Specifically, the material uniformizing and slag breaking device comprises a plurality of rotating shafts, the rotating shafts are arranged side by side in sequence, and the rotating shafts at two ends are arranged in an inclined manner towards the center of the granulation bin.

[0012] Further, the surface of the rotating shaft is provided with slag breaking teeth.

[0013] Specifically, the vertical heat exchange surface is a screen type heat exchanger or a vertical pipe bundle, and is provided with a soot blowing device.

[0014] Specifically, the material uniformizing device comprises a plurality of rotating shafts, the rotating shafts are arranged side by side in sequence, and are used for conveying slag particles on two sides to the center of the granulator, and the rotating shafts are provided with cooling medium.

[0015] Specifically, the heat exchange tube bundle is an anti-ash accumulation tube bundle.

[0016] Specifically, the discharging device adopts a rotary structure.

[0017] Compared with the prior art, the application has at least the following beneficial effects:

[0018] The granulator of the high-temperature slag particle adhesion and blockage prevention device is provided with the material uniformizing and slag breaking device, slag wool generated at the edge of the rotating cup is broken; the outer side of the granulator is provided with the vertical heat exchange surface, radiation heat exchange of slag particles in the falling process is strengthened; the lower part of the granulator is provided with the material uniformizing device, slag particles enter the moving bed uniformly; the lower part of the material uniformizing device is provided with the anti-ash accumulation heat exchange tube bundle, ash accumulation and blockage are prevented to affect heat exchange; the bottom of the moving bed is provided with the vibrating device, slag particles in the moving bed are uniformly fallen; and the outlet of the moving bed is provided with the discharging device, slag particles are smoothly discharged.

[0019] Further, the cooling air of the granulator edge can promote the cooling of the slag particles in the flight process, reducing the possibility of slag particles sticking to the wall.

[0020] Further, the air outlet direction of the granulator edge air outlet deviates from the edge of the granulator outward, avoiding direct cooling of the liquid film and liquid filament that has not yet broken, causing slag wool.

[0021] Further, the edge wall air above the side wall of the granulation bin can promote the cooling of the slag particles in the flight process, reducing the possibility of slag particles sticking to the wall, and the inlet of the edge wall air is arranged in multiple layers along the circumference of the granulation bin, so that the entire slag particle wall collision area is uniformly covered with edge wall air.

[0022] Further, the material uniformizing and slag breaking device can make the slag particles uniformly fall, reducing the contact probability of the slag particles and improving the heat exchange efficiency of the system.

[0023] Further, the surface of the rotating shaft of the material uniformizing and slag breaking device is provided with slag breaking teeth, which cut the slag wool during opposite rotation.

[0024] Further, the use of vertical heat exchange surfaces can reduce the contact between the heat exchange surface and the semi-molten slag particles while ensuring heat exchange, and the vertical heat exchange surface is equipped with a soot blowing device to clean the soot on the vertical heat exchange surface at regular intervals, which can prevent the slag particles from sticking to the heat exchange surface.

[0025] Further, the full material uniformizing device is used, and the rotating shaft transports the slag particles on both sides to the center of the granulator, so that the slag particles in the moving bed space are uniformly distributed, enhancing the heat exchange effect.

[0026] Further, the anti-ash accumulation tube bundle can ensure heat exchange while preventing ash accumulation and blockage between the tube bundles.

[0027] Further, the combination of the vibration device and the uniform discharge device can promote the smooth and uniform discharge of the slag particles.

[0028] In summary, the present application is aimed at the whole process of blast furnace slag centrifugal granulation and waste heat recovery, which not only efficiently breaks the slag wool generated in the granulation process and maintains the normal operation of the motor, but also effectively prevents high-temperature slag particles from sticking to the wall, heat reversal and sticking, so that the slag particles are uniformly distributed in the granulation bin and the moving bed space, preventing slag particle accumulation and blockage, which is conducive to long-term operation of the system.

[0029] The technical solutions of the present application will be further described in detail below with the help of the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The present application is a structural schematic diagram.

[0031] Wherein: 1. granulator; 2. side wall wind; 3. material uniformizing and slag breaking device; 4. vertical heat exchange surface; 5. material uniformizing device; 6. heat exchange tube bundle; 7. vibrating device; 8. discharging device. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one edge" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0034] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] It should be understood that when used in the present specification and the appended claims, the terms "include" and "contain" indicate the presence of described features, whole, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, whole, steps, operations, elements, components and / or sets thereof.

[0036] It should also be understood that the terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the present application specification and the appended claims, unless otherwise specified in the context, the singular form "a", "an" and "the" is intended to include the plural form.

[0037] It should be further understood that the term "and / or" as used herein in the specification and in the claims, if any, means any one of the items, any combination of the items, or all of the items in the list in which the term is used, and that it is intended to cover the combination or sub-combination of one or more items.

[0038] The various structural diagrams according to the disclosed embodiments of the present application are shown in the accompanying drawings. These diagrams are not drawn to scale, in which certain details are exaggerated for clarity, and some details may be omitted. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and in actuality may deviate due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes and relative positions can be additionally designed by those skilled in the art according to actual needs.

[0039] The present application provides a device for preventing high-temperature slag particles from sticking and blocking, wherein high-temperature liquid slag is centrifuged into fine droplets by a granulator, and cooling gas is arranged at the outer edge of the granulator; the slag droplets fly to the wall surface of the granulation bin after passing through the edge cooling gas, and side wall wind is arranged at the wall surface; a material uniformizing and slag breaking device is arranged in the middle of the granulation bin; a vertical heat exchange surface is arranged at the lower part of the granulation bin, and a soot blowing device is arranged on the heat exchange surface; a material uniformizing and slag breaking device is arranged at the upper part of the moving bed; a heat exchange tube bundle for preventing soot accumulation is arranged in the middle of the moving bed; the bottom of the moving bed is a bulk material accumulation part, and a vibrating device is arranged; and a discharging device is arranged at the outlet of the moving bed. The present application can prevent high-temperature slag particles from sticking and back heating, efficiently break the slag wool generated in the granulation process, make the slag particles uniformly distributed in the granulation bin and the moving bed, prevent the accumulation and blocking of the slag particles, and reduce accidents.

[0040] Please refer to Figure 1 The present application provides a device for preventing high-temperature slag particles from sticking and blocking, wherein high-temperature liquid slag is centrifuged into fine droplets by a granulator, and cooling gas is arranged at the outer edge of the granulator; the slag droplets fly to the wall surface of the granulation bin after passing through the edge cooling gas, and side wall wind is arranged at the wall surface; a material uniformizing and slag breaking device is arranged in the middle of the granulation bin; a vertical heat exchange surface is arranged at the lower part of the granulation bin, and a soot blowing device is arranged on the heat exchange surface; a material uniformizing and slag breaking device is arranged at the upper part of the moving bed; a heat exchange tube bundle for preventing soot accumulation is arranged in the middle of the moving bed; the bottom of the moving bed is a bulk material accumulation part, and a vibrating device is arranged; and a discharging device is arranged at the outlet of the moving bed. The present application can prevent high-temperature slag particles from sticking and back heating, efficiently break the slag wool generated in the granulation process, make the slag particles uniformly distributed in the granulation bin and the moving bed, prevent the accumulation and blocking of the slag particles, and reduce accidents.

[0041] The granulator 1 is arranged at the center position of the granulation bin, the side wall wind 2 is arranged at the upper wall surface of the granulation bin, the material uniformizing and slag breaking device 3 is arranged in the middle of the granulation bin and above the granulator 1, and is arranged close to the granulator 1 for transporting the slag particles near the wall surface to the center of the granulation bin to break the slag, the vertical heat exchange surface 4 is arranged at the lower part of the granulation bin and outside the granulator 1, the material uniformizing device 5 is arranged below the partition wall of the granulator 1, the heat exchange tube bundle 6 is arranged below the material uniformizing device 5 and in the middle of the moving bed, the vibrating device 7 is arranged at the bottom of the moving bed to ensure the smooth falling of the slag particles in the moving bed, and the discharging device 8 is uniformly arranged at the outlet of the moving bed.

[0042] Cooling gas is arranged at the outer edge of the granulator 1, the cooling gas is rotary jet, straight flow jet or natural air outlet, and the cooling gas is air, water vapor or inert gas.

[0043] The air outlets of the granulator 1 are uniformly distributed along the circumference of the granulator 1, which can be a belt-shaped air outlet or a multi-point air outlet; the air outlet direction deviates from the edge of the granulator and is outward, and performs convection heat exchange with the slag particles after granulation.

[0044] The inlet of the side wall air 2 is arranged circumferentially along the granulation bin, and is uniformly or non-uniformly distributed according to the shape of the granulation bin, and can be multi-layered in the vertical direction.

[0045] The incident angle of the side wall air 2 can be adjusted to form an air film to prevent slag particles from adhering to the side wall of the granulation bin.

[0046] Among them, the side wall air 2 is air, water vapor or inert gas.

[0047] The uniform material slag breaking device 3 is composed of a row of rotating shafts, and the rotating direction of the shafts can be adjusted; the surface of the shaft is provided with slag breaking teeth, and the inside of the shaft is provided with a cooling medium, which is gas, water or organic medium.

[0048] The uniform material slag breaking device 3 is arranged with both ends inclined to the center of the granulation bin, so as to realize the transportation of the slag particles close to the wall surface to the center of the granulation bin; the shaft close to the side wall of the granulation bin rotates to the center of the granulation bin, which plays a transportation role; close to the granulator, the adjacent shafts rotate towards each other, which realizes the slag breaking effect.

[0049] The vertical heat exchange surface 4 is a screen type heat exchanger or a vertical pipe number, which reduces the contact between the heat exchange surface and the semi-molten slag particles while ensuring heat exchange.

[0050] The vertical heat exchange surface 4 is equipped with a soot blowing device, which cleans the soot on the vertical heat exchange surface at regular time intervals, preventing the slag particles from adhering to the heat exchange surface.

[0051] The uniform material device 5 is composed of a row of rotating shafts, which transport the slag particles on both sides to the center of the granulator, so that the slag particles in the moving bed space are uniformly distributed, and the heat exchange effect is enhanced.

[0052] The rotating shaft is provided with a cooling medium, which is gas, water or organic medium.

[0053] The heat exchange tube bundle 6 is located in the middle of the moving bed, and H-shaped finned tubes are used to prevent dust accumulation and blockage between the tube bundles while ensuring heat exchange.

[0054] The bottom of the moving bed is a bulk material accumulation part, and a vibrating device 7 is arranged thereon, which can be a vibrating motor, a vibrating buried pipe and the like, to ensure that the slag particles in the moving bed fall smoothly.

[0055] The discharge device 8 adopts a rotating structure, including but not limited to a rotating discharge valve, a spiral discharge valve and a star-shaped discharge valve, to ensure that the slag particles are uniformly discharged.

[0056] The working principle of the high-temperature slag particle adhesion and blockage prevention device is as follows:

[0057] At the initial stage of system operation, the temperature of the granulation bin is low, and the liquid filaments formed by slag granulation cannot be split into slag droplets due to the excessively fast cooling speed, forming a large amount of slag wool; the slag wool accumulates around the granulator 1, which is easy to cause the motor to be stuck, and the slag wool is cut off by the material uniformizing and slag breaking device 3 close to the granulator 1, thereby reducing the occurrence of accidents.

[0058] The slag droplets leaving the granulator 1 are cooled and exchanged in the flying process, but because the temperature is too high, the slag particles flying to the wall surface are still in a semi-molten state, which are extremely easy to stick to the wall surface of the granulation bin, causing the heat exchange to be deteriorated, and the cooling air at the edge of the granulator 1 and the edge wall air 2 above the side wall of the granulation bin can promote the cooling of the slag particles in the flying process, thereby reducing the possibility of the slag particles sticking to the wall.

[0059] After the slag particles rebound after hitting the wall, they are mostly distributed close to the wall surface of the granulation bin, and the high-temperature slag particles are extremely easy to cause reheat sticking by contacting each other, and the material uniformizing and slag breaking device 3 can make the slag particles uniformly fall, thereby reducing the contact probability of the slag particles and improving the heat exchange efficiency of the system.

[0060] The temperature of the slag particles just falling after hitting the wall is still very high, and at this time, if horizontal tube bundles are used, it is easy to cause the slag particles to collide, break and stick, and if vertical heat exchange surfaces 4 are used, the contact between the heat exchange surfaces and the semi-molten slag particles can be reduced while ensuring the heat exchange. In addition, the slag particles are prevented from sticking to the heat exchange surfaces by providing a soot blowing device on the vertical heat exchange surfaces 4 and cleaning the soot on the vertical heat exchange surfaces in a timely manner.

[0061] Because of the blockage of the granulator partition wall, there is no slag particle from above in the center of the moving bed, and the uneven distribution of the slag particles causes the heat exchange amount of the tube bundles in the moving bed to be different, which is not conducive to the long-term stable operation of the system. The full-coverage material uniformizing device 5 can overcome this problem. The H-shaped finned tube is used to solve the problem of soot accumulation in the tube bundles in the moving bed.

[0062] Finally, the uneven discharge of the moving bed is easy to cause blockage, and the combination of the vibration device 7 and the uniform discharge device 8 can promote the slag particles to be smoothly and uniformly discharged.

[0063] In summary, the high-temperature slag particle sticking and blockage prevention device of the present application can not only efficiently break the slag wool generated in the granulation process and maintain the normal operation of the motor, but also effectively prevent the high-temperature slag particles from sticking to the wall, reheat and sticking, so that the slag particles are uniformly distributed in the granulation bin and the moving bed space, the slag particles are prevented from accumulating and blocking, and the long-term operation of the system is facilitated.

[0064] The above content only illustrates the technical idea of the present application, and cannot limit the protection scope of the present application, and any modification made on the basis of the technical solution according to the technical idea of the present application falls within the protection scope of the claims of the present application.

Claims

1. A device for preventing the adhesion and clogging of high-temperature slag particles, characterized by, The granulator (1) is arranged at the center of the granulation bin, the air outlets of the granulator (1) are uniformly distributed around the granulator (1), the air outlet direction deviates from the edge of the granulator (1) outward, the top of the granulator (1) is provided with a material uniformizing and slag breaking device (3), the material uniformizing and slag breaking device (3) comprises a plurality of rotating shafts arranged side by side, the rotating shafts at both ends are arranged obliquely towards the center of the granulation bin, the surface of the rotating shafts is provided with slag breaking teeth, the bottom of the granulator (1) is provided with a material uniformizing device (5), the outer side of the granulator (1) is provided with a vertical heat exchange surface (4), the vertical heat exchange surface (4) is arranged between the material uniformizing and slag breaking device (3) and the material uniformizing device (5), the vertical heat exchange surface (4) is a screen heat exchanger or a vertical pipe bundle, and is provided with a soot blowing device, the bottom of the material uniformizing device (5) is provided with a heat exchange pipe bundle (6), the heat exchange pipe bundle (6) is located in the middle of the moving bed, the bottom of the moving bed is provided with a vibrating device (7), and the outlet of the moving bed is uniformly provided with a discharging device (8).

2. The device according to claim 1, wherein The outer edge of the granulator (1) is provided with cooling gas, and the cooling gas adopts rotary injection, straight flow injection or natural air outlet mode.

3. The device according to claim 1, wherein The upper wall of the granulation bin is provided with a side wall air (2) with adjustable incident angle, the inlet of the side wall air (2) is arranged along the circumference of the granulation bin, and the incident port in the vertical direction is a multi-layer structure.

4. The device according to claim 1, wherein The material uniformizing device (5) comprises a plurality of rotating shafts arranged side by side, which is used for conveying the slag particles on both sides to the center of the granulator (1), and the rotating shafts are provided with cooling medium.

5. The device according to claim 1, wherein The heat exchange pipe bundle (6) is an anti-ash pipe bundle.

6. The device of claim 1, wherein The discharging device (8) adopts a rotating structure.

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