Liquid slag cooling device

Abstract

The invention discloses a liquid slag cooling device which comprises a boiler, and liquid slag is granulated and cooled in the boiler. The boiler is connected with an air cooling part, a water cooling part and a solid cooling part, the air cooling part blows cooling air into the boiler, and the cooling air exchanges heat with granulated slag; the water cooling part sprays cooling water into the boiler, and the cooling water exchanges heat with the granulated slag; the solid cooling part sprays cold materials into the boiler, and the cold materials make contact with the granulated slag in a colliding mode for heat exchange. According to the cooling device, gas-phase cooling, liquid-phase cooling and solid-phase cooling are combined at the same time, high-temperature slag is jointly cooled by means of cooling water, cooling air and cold charge, the cooling speed of the slag is increased, the temperature of the slag at the slag outlet is effectively reduced, and the cooling efficiency is effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of high-temperature slag cooling, and in particular relates to a liquid slag cooling device. Background Art

[0002] High temperature slag is usually a silicate material with good performance. After processing, it can be used as a raw material for the production of building materials and fertilizers. After rapid cooling, the liquid high temperature slag does not have time to form mineral crystals inside, and a part of the chemical energy is stored in the formed glass, so it has high activity. The high temperature slag after extreme cold treatment has potential hydraulic gelling properties and can be used as an excellent cement raw material. Therefore, there is a huge market demand for the high temperature slag treated by extreme cold treatment.

[0003] Especially for the sensible heat of high-temperature slag, the non-ferrous metal industry and the metallurgical industry lack waste heat utilization technology. The temperature of high-temperature slag is as high as 1000℃ or more. If the lower limit temperature of solid waste heat resource recovery is 500℃ according to international regulations, the high-temperature slag contains a large amount of waste heat resources. Most of the treatment of high-temperature slag uses water flushing, which not only makes the sensible heat of the high-temperature slag unusable, but also causes a large waste of water resources, causing serious pollution to the atmosphere, water and soil, and worsening the working environment. How to prevent environmental pollution caused by slag treatment and how to recover the sensible heat of high-temperature slag are still urgent issues to be solved, and the dry granulation method is the most effective way to solve this problem.

[0004] In the dry granulation method, the traditional cooling method is to pass cold air into the boiler for cooling, but this cooling method has an unsatisfactory cooling effect, the slag temperature at the slag outlet is high, and the cooling efficiency is low. Summary of the invention

[0005] The purpose of the present invention is to provide a liquid slag cooling device to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides a liquid slag cooling device, comprising a boiler, in which the liquid slag is granulated and cooled; the boiler is connected to an air cooling part, a water cooling part and a solid cooling part. The air cooling part blows cooling air into the boiler, and the cooling air exchanges heat with the granulated slag; the water cooling part sprays cooling water into the boiler, and the cooling water exchanges heat with the granulated slag; the solid cooling part sprays cold material into the boiler, and the cold material collides and contacts with the granulated slag to exchange heat.

[0007] Optionally, the water cooling part includes a plurality of nozzles arranged inside the boiler, and the nozzles are used to spray cooling water.

[0008] Optionally, an annular pipe is fixedly provided on the outside of the boiler, and all the nozzles are detachably connected to and communicated with the annular pipe, and the annular pipe is used to provide cooling water to the nozzles.

[0009] Optionally, all of the nozzles are arranged below the liquid slag feed port of the boiler.

[0010] Optionally, the solid cooling part includes a blast fan, a cold material inlet is provided at a connection port between the blast fan and the boiler, and the blast fan blows the cold material at the cold material inlet into the boiler.

[0011] Optionally, a cold material bin for storing cold material is provided outside the boiler, and an inclined cold material trough is provided between the cold material bin and the cold material inlet, and one end of the cold material trough connected to the cold material inlet is lower than one end of the cold material trough connected to the cold material bin.

[0012] Optionally, the cold material inlet is arranged below the water cooling part.

[0013] Optionally, the air cooling unit includes a cooling fan, and a jet port is provided in the boiler, the jet port is connected to the cooling fan, and the jet port sprays cooling gas into the boiler.

[0014] Optionally, the air jet is arranged at the bottom of the boiler.

[0015] Optionally, a granulation fan is provided outside the boiler, and the granulation fan is connected to a liquid slag feed port, and the granulation fan granulates and condenses the liquid slag at the liquid slag feed port and blows the granulation fan into the boiler.

[0016] Compared with the prior art, the present invention has the following advantages and technical effects:

[0017] The present invention proposes a cooling device that simultaneously utilizes gas phase cooling, liquid phase cooling, and solid phase cooling. The present invention simultaneously uses cooling water, cooling air, and cold material to cool the high-temperature slag, thereby increasing the cooling rate of the slag, effectively reducing the temperature of the slag at the slag outlet, and effectively improving the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic structural diagram of the liquid slag cooling device of the present invention;

[0020] Figure 2 This is a schematic diagram of the water cooling structure of the present invention;

[0021] Among them, 1. high temperature furnace, 2. transition slag hopper, 3. slag trough, 4. throttle valve, 5. main water inlet pipe, 6. granulating fan air inlet pipe, 7. boiler, 8. granulating fan, 9. cooling fan, 10. slag outlet, 11. blast fan, 12. blast fan air inlet pipe, 13. cold material trough, 14. cold material bin, 15. annular pipe, 16. nozzle, 17. exhaust fan. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1 to Figure 2 As shown, the embodiment of the present invention discloses a liquid slag cooling device, including a boiler 7, in which the liquid slag is granulated and cooled; the boiler 7 is connected to an air cooling part, a water cooling part and a solid cooling part. The air cooling part blows cooling air into the boiler 7, and the cooling air exchanges heat with the granulated slag; the water cooling part sprays cooling water into the boiler 7, and the cooling water exchanges heat with the granulated slag; the solid cooling part sprays cold material into the boiler 7, and the cold material collides and contacts with the granulated slag to exchange heat.

[0025] After the liquid slag is granulated in the boiler 7, high-temperature granulated slag is formed. Under the action of cooling wind, the high-temperature granulated slag exchanges heat with the cooling wind, and the temperature of the granulated slag is reduced; the high-temperature granulated slag contacts the cooling water sprayed from the water cooling part. Due to the high temperature of the high-temperature granulated slag, the high-temperature granulated slag can quickly vaporize the cooling water. When the cooling water vaporizes, it takes away the heat of the granulated slag and quickly reduces the temperature of the granulated slag; the high-temperature granulated slag collides with the cold material to generate heat exchange between the two, and the heat of the high-temperature granulated slag is transferred to the cold material, and the cold material and the granulated slag are discharged from the boiler 7 together. Whether inside the boiler 7 or in the process of being discharged, the two can always exchange heat. The present invention proposes a cooling device that combines gas phase cooling, liquid phase cooling, and solid phase cooling. The present invention can realize the simultaneous cooling of the high-temperature slag by means of cooling water, cooling wind, and cold material, thereby increasing the cooling speed of the slag, effectively reducing the temperature of the slag at the slag outlet, and effectively improving the cooling efficiency.

[0026] The boiler 7 is connected to a liquid slag feeding assembly, which includes a transition slag hopper 2, which is used to temporarily hold the liquid slag produced by the high-temperature furnace 1. The transition slag hopper 2 is connected to a slag trough 3, and the discharge end of the slag trough 3 is connected to the liquid slag feeding port of the boiler 7. The liquid slag enters the boiler 7 through the slag trough 3 and the liquid slag feeding port. A granulation fan 8 is arranged outside the boiler 7, and a granulation fan air intake pipe 6 is connected between the granulation fan 8 and the liquid slag feeding port. The granulation fan 8 is connected to the liquid slag feeding port, and the granulation fan 8 granulates and condenses the liquid slag at the liquid slag feeding port and blows it into the boiler 7 for subsequent cooling.

[0027] Further optimizing the scheme, the water cooling part includes a plurality of nozzles 16 arranged inside the boiler 7, and the nozzles 16 are used to spray cooling water. The cooling device disclosed in this embodiment is provided with 4 nozzles 16 inside, and the 4 nozzles 16 are arranged on the same horizontal plane and evenly distributed around the boiler 7, so that the granulated slag in the boiler 7 can be sprayed with water in all directions, thereby improving the cooling efficiency of the granulated slag. Of course, the number of nozzles 16 can also be adjusted according to the size of the boiler 7, the feeding speed of the liquid slag, the cooling temperature of the liquid slag, etc.

[0028] The nozzle 16 can select parameters such as the amount of water sprayed and the state of water according to actual needs. This embodiment adopts an atomizing nozzle, through which the cooling water is atomized, and the atomized cooling water can be diffused in the boiler 7, and can better contact with the high-temperature granulated slag, further improving the slag cooling speed and cooling effect.

[0029] Preferably, an annular pipe 15 is fixedly provided outside the boiler 7, and all the nozzles 16 are detachably connected and communicated with the annular pipe 15. The nozzle 16 is in an L-shaped structure, the water spraying part of the nozzle 16 is arranged inside the boiler 7, and the connection between the nozzle 16 and the annular pipe 15 is arranged outside the boiler 7. The annular pipe 15 is fixedly connected with the main water inlet pipe 5, and a throttle valve is arranged at the connection between the main water inlet pipe 5 and the annular pipe 15. Cooling water is supplied to the annular pipe 15 through the main water inlet pipe 5, and the throttle valve controls the flow rate of the supplied cooling water. The annular pipe 15 is used to provide cooling water to the nozzle 16, and the cooling water is sprayed into the boiler 7 through the nozzle 16, so as to achieve the effect of cooling the granulated slag. All the nozzles 16 are connected to the same annular pipe 15, which is convenient for centralized water supply and flow control. Of course, in this embodiment, each nozzle 16 can also be connected to a water inlet pipe alone, or one or several of them can be connected to a water inlet pipe, and the design connection is carried out according to actual needs.

[0030] Preferably, all the nozzles 16 are arranged below the liquid slag feed port of the boiler 7. The atomized cooling water sprayed by the nozzles 16 diffuses between all the nozzles 16 to form a cooling water diffusion area. After the granulated and condensed high-temperature granulated slag is sprayed out, it starts to move downward under the action of gravity, and directly enters the cooling water diffusion area during the downward movement. The cooling water mist directly adheres to the high-temperature granulated slag to start heat exchange, thereby increasing the contact time between the cooling water and the granulated slag, and improving the cooling speed and effect of the granulated slag.

[0031] Further optimization scheme, the solid cooling part includes a blast fan 11, a cold material inlet is provided at the connection port of the blast fan 11 and the boiler 7, and a blast fan air intake pipe 11 is provided between the cold material inlet and the blast fan 11; the blast fan 11 blows the cold material at the cold material inlet into the boiler 7, and the blast fan 11 sprays the cold material upward to make it collide with the falling cold material, and heat exchange occurs between the high-temperature granulated slag and the cold material, and the heat of the high-temperature granulated slag is transferred to the cold material. The blast fan 11 sprays the cold material upward to extend the heat exchange time between the high-temperature granulated slag and the cold material, thereby improving the cooling efficiency. The cold material is discharged from the boiler 7 together with the granulated slag, and heat exchange can always be carried out between the high-temperature granulated slag and the cold material, whether inside the boiler 7 or during the discharge of both, to further improve the cooling speed and cooling effect of the granulated slag.

[0032] At the same time, the cold material inlet and the liquid slag feed port are arranged on both sides of the boiler 7, and the liquid slag feed port is higher than the cold material inlet. When working, the granulating fan 8 granulates and condenses the liquid slag at the liquid slag feed port and blows it into the boiler 7, and the blast fan 11 blows the cold material at the cold material inlet into the boiler 7. The materials sprayed by the two can be well mixed in the process of falling, thereby improving the heat exchange effect between the high-temperature granulated slag and the cold material.

[0033] A cold material bin 14 for storing cold material is arranged outside the boiler 7. A cold material trough 13 is arranged between the cold material bin 14 and the cold material inlet. The cold material is stored in the cold material bin 14. The blower fan 11 is arranged below the cold material bin 14. The cold material trough 13 is arranged obliquely. The side of the cold material trough 13 in contact with the cold material bin 14 is higher than the side of the cold material trough 13 in contact with the boiler 7. The cold material trough 13 is arranged obliquely so that when cold material needs to be added to the boiler 7, the cold material can move downward into the boiler 7 under the action of gravity. When it is necessary to spray cold material into the boiler 7, the cold material enters the cold material inlet through the cold material bin 14 and the cold material trough 13, and the cold material is sprayed into the boiler 7 under the action of the blower fan 11. A slag outlet 10 is arranged at the bottom of the boiler 7. The slag outlet 10 is used to discharge the cooled granulated slag and cold material. During the discharge process, heat exchange can be carried out between the high-temperature granulated slag and the cold material, further improving the cooling speed and cooling effect of the granulated slag.

[0034] The material discharged from the slag outlet 10 can be operated in the next step according to the actual temperature. If the temperature required by the application field is relatively high, the material discharged from the slag outlet 10 can be directly used; if the temperature required by the application field is relatively low, the material discharged from the slag outlet 10 can be naturally cooled, and the cooled material can be used. When the amount of cold material in the cold material bin 14 is insufficient, a portion of the naturally cooled material is transported to the cold material bin 14 through a conveyor belt or an elevator or other device; when the discharged material is too late to replenish the cold material bin 14, a jet is set on one side of the conveyor belt or the elevator or other device and / or a water spray device is set above the conveyor belt or the elevator or other device. The water spray device includes a plurality of nozzles arranged above the conveyor belt, and the nozzles are used to directly spray water to cool the material with a large flow rate. When the water spray device sprays too much water, the excess water can be reused, and since the temperature of the material discharged from the slag outlet 10 is still relatively high, the sprayed water can be quickly vaporized without affecting the subsequent processes.

[0035] Preferably, the cold material inlet is arranged below the water cooling part, that is, the nozzle 16 is arranged above the cold material inlet, and the cooling water diffusion area formed by the cooling water sprayed from the nozzle 16 is above the cold material inlet. This arrangement allows the high-temperature granulated slag to be cooled by cooling water and cold material in sequence. This arrangement can reduce the amount of sprayed cold material entering the cooling water diffusion area, so that the cooling water can be used to the greatest extent for cooling the high-temperature granulated slag, further improving the cooling effect of the granulated slag. Even if part of the cold material enters the cooling water diffusion area, it will be quickly vaporized and evaporated by the high temperature in the boiler 7, and will not affect the cooling effect.

[0036] Further optimization scheme, the air cooling part includes a cooling fan 9, and a jet is provided in the boiler 7, the jet is connected to the cooling fan 9, and the jet sprays cooling gas into the boiler 7. An air outlet is provided at the top of the boiler 7, and the air outlet is connected to the exhaust fan 17 through an air outlet pipe, and the gas in the boiler 7 is extracted by the exhaust fan 17. Under the action of the cooling wind, the high-temperature granulated slag exchanges heat with the cooling gas, and the temperature of the granulated slag is reduced; in addition, the cooling wind can improve the flow of gas in the boiler 7, and combined with the exhaust fan 17, it can speed up the gas exchange efficiency of the boiler 7, discharge the heated gas and enter the cooling gas, and improve the cooling speed and cooling effect of the granulated slag. The high-temperature gas discharged by the exhaust fan 17 can be recovered by a heat recovery device. The above structure improves the cooling speed and the efficiency of heat recovery, and effectively reduces the temperature of the slag at the slag outlet.

[0037] Preferably, the air jet is arranged at the bottom of the boiler 7, that is, the nozzle 16, the cold material inlet, and the air jet are distributed in sequence from top to bottom. The air jet is arranged at the bottom of the boiler 7, and the air outlet is arranged at the top of the boiler 7. The cooling gas moves from bottom to top, and the cooling gas passes through the granulated slag and cold material landing area, the granulated slag and cold material initial mixing area, the cooling water diffusion area and the granulated slag formation area in sequence, and finally discharged from the boiler 7 through the exhaust fan 17.

[0038] When the cooling gas moves from bottom to top in the boiler 7, the temperature of the cooling gas increases from low to high. When the temperature is the lowest, the cooling gas cools the material that is about to be discharged from the boiler 7. At this time, the cooling gas temperature is the lowest, and the temperature of the material that is about to be discharged from the boiler 7 is also the lowest relative to the material above. This setting can fully cool the granulated slag and effectively reduce the temperature of the slag at the slag outlet. After the temperature rises a little, the initial mixing area of ​​the granulated slag and the cold material begins to be cooled, and the cooling air flow will disturb the granulated slag and the cold material, so that the two are mixed more evenly and the heat exchange effect is better; and the cooling air flow has a lifting effect on the granulated slag and the cold material, prolonging the heat exchange time of the granulated slag in the boiler 7, and improving the cooling speed and cooling effect of the granulated slag. After the temperature rises further, the cooling gas enters the cooling water diffusion area. The steam generated by the atomized cooling water after heat exchange with the granulated slag moves upward with the cooling gas, accelerating the replacement of the atomized water in the cooling water diffusion area. At the same time, the cooling airflow has a certain lifting effect on the cooling water diffusion area, allowing the cooling water diffusion area to move upward a certain distance. The cooling water diffusion area that moves upward a certain distance can better overlap with the granulated slag formation area. Finally, the cooling gas enters the granulated slag formation area and directly performs gas cooling on the newly formed granulated slag, thereby improving the cooling speed and cooling effect of the granulated slag.

[0039] The description of the above embodiments is only used to help understand the method of the present invention and its core concept; at the same time, for a person skilled in the art, according to the concept of the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of the specification of the present invention should not be understood as a limitation of the present invention.

[0040] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0041] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A liquid slag cooling device, characterized in that: The invention comprises a boiler (7), in which liquid slag is granulated and cooled; the boiler (7) is connected to: an air cooling section, the air cooling section blowing cooling air into the boiler (7), the cooling air exchanging heat with the granulated slag; a water cooling section, the water cooling section spraying cooling water into the boiler (7), the cooling water exchanging heat with the granulated slag; A solid cooling part, wherein the solid cooling part sprays cold material into the boiler (7), and the cold material collides and contacts with the granulated slag to perform heat exchange.

2. A liquid slag cooling device according to claim 1, characterized in that: The water cooling part comprises a plurality of nozzles (16) arranged inside the boiler (7), and the nozzles (16) are used for spraying cooling water.

3. The liquid slag cooling device according to claim 2, characterized in that: An annular pipe (15) is fixedly arranged outside the boiler (7), and all the nozzles (16) are detachably connected to and communicated with the annular pipe (15). The annular pipe (15) is used to provide cooling water to the nozzles (16).

4. The liquid slag cooling device according to claim 2, characterized in that: All the nozzles (16) are arranged below the liquid slag feed port of the boiler (7).

5. The liquid slag cooling device according to claim 1, characterized in that: The solid cooling part comprises a blast fan (11), and a cold material inlet is arranged at the connection port between the blast fan (11) and the boiler (7). The blast fan (11) blows the cold material at the cold material inlet into the boiler (7).

6. The liquid slag cooling device according to claim 5, characterized in that: A cold material bin (14) for storing cold material is arranged outside the boiler (7), and an inclined cold material trough (13) is arranged between the cold material bin (14) and the cold material inlet, and the end of the cold material trough (13) connected to the cold material inlet is lower than the end of the cold material trough (13) connected to the cold material bin (14).

7. The liquid slag cooling device according to claim 5, characterized in that: The cold material inlet is arranged below the water cooling part.

8. The liquid slag cooling device according to claim 1, characterized in that: The air cooling unit comprises a cooling fan (9), and a jet nozzle is arranged in the boiler (7). The jet nozzle is connected to the cooling fan (9), and the jet nozzle sprays cooling gas into the boiler (7).

9. The liquid slag cooling device according to claim 8, characterized in that: The air jet is arranged at the bottom of the boiler (7).

10. The liquid slag cooling device according to claim 4, characterized in that: A granulation fan (8) is arranged outside the boiler (7), and the granulation fan (8) is connected to the liquid slag feed port. The granulation fan (8) granulates and condenses the liquid slag at the liquid slag feed port and blows it into the boiler (7).

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