An automatic processing and recycling system for high-temperature slag

Abstract

The application discloses a high-temperature furnace slag automatic treatment and recovery system, and relates to the technical field of coal-fired hot blast furnaces.The high-temperature furnace slag automatic treatment and recovery system comprises a furnace slag introduction device and a cooling assembly.The furnace slag introduction device is in communication with a slag discharge port of the hot blast furnace.The cooling assembly comprises a blowing device, a cooling device and a ventilation pipe.The cooling device has a closed cavity inside.The cooling device is in communication with the furnace slag introduction device.The blowing device is arranged on the cooling device and can blow air into the closed cavity.The ventilation pipe is in communication with the cooling device at one end and with a combustion chamber of the hot blast furnace at the other end.The high-temperature furnace slag automatic treatment and recovery system can reduce the temperature of the furnace slag discharged from the hot blast furnace, effectively utilize the residual heat of the furnace slag, save energy and reduce consumption, and separate the furnace slag from dust, so that the slag discharge process is dust-free and meets environmental protection requirements.

Description

Technical Field

[0001] This application relates to the field of coal-fired hot blast stove technology, and in particular to an automated system for the treatment and recycling of slag. Background Technology

[0002] In the phosphate fertilizer production process, the heat required for the drying process is usually provided by a coal-fired hot blast stove. However, due to internal and external factors such as the quality of anthracite and the air volume, complete combustion of coal in the hot blast stove is difficult to achieve, inevitably producing a certain amount of incompletely burned slag. This slag needs to be periodically discharged through the bottom of the settling chamber, and because incompletely burned slag has significant hazardous characteristics such as high temperature and dust content, it cannot be safely collected, processed, and recycled using simple methods such as conventional woven bags.

[0003] The commonly used method in current technology is to directly discharge high-temperature slag onto the ground, allow it to cool naturally, and then manually transfer it to transport vehicles. This method has the following serious drawbacks: 1. Energy waste: The residual heat carried away during the discharge of high-temperature slag is wasted. High cost and high labor intensity: The manual transfer process consumes a large amount of manpower, significantly increasing personnel transfer costs and the labor intensity of employees; 2. Environmental pollution: The discharge and transfer process generates a large amount of dust, causing serious pollution to the site and surrounding environment, which does not meet environmental protection requirements. Safety hazards: The exposed discharge of high-temperature slag and the diffusion of dust pose safety and health threats to on-site operators, such as burns and dust inhalation, and also affect the visual management of the production site (such as visibility); 3. Production efficiency bottleneck: The natural cooling process of slag takes a long time, making it impossible to transfer it immediately after discharge. Under extreme production loads or continuous operation requirements, the limited space for slag accumulation in the settling chamber may force unplanned shutdowns or reduced-load operation of the coal-fired hot blast stove, disrupting its continuity, stability, and uniformity of operation. This, in turn, directly affects the stability of subsequent drying processes, ultimately leading to significant fluctuations in the quality of phosphate fertilizer products. Utility Model Content

[0004] The purpose of this application is to provide an automated high-temperature slag treatment and recycling system that can recover and utilize the waste heat of slag and cool it down.

[0005] To achieve the above objectives, this application provides an automated high-temperature slag treatment and recycling system, comprising: a slag inlet device and a cooling component;

[0006] The slag inlet device is connected to the slag outlet of the hot blast stove;

[0007] The cooling assembly includes a blower, a cooling device, and a ventilation pipe. The cooling device has a sealed cavity inside and is connected to the slag inlet device. The blower is located in the cooling device and can blow air into the sealed cavity. One end of the ventilation pipe is connected to the cooling device, and the other end is connected to the combustion chamber of the hot blast stove.

[0008] In some embodiments, a slag discharge device is also provided. The cooling device has a slag outlet at the bottom, which is connected to the slag discharge device. The slag discharge device can transport the slag to the next process.

[0009] In some embodiments, the slag discharge device is a screw conveyor.

[0010] In some embodiments, the cooling device is provided with a metal mesh bag, the top of which is connected to the slag inlet device, and the bottom of which is connected to the slag outlet.

[0011] In some embodiments, the metal mesh bag is made of a flexible, heat-resistant material.

[0012] In some embodiments, the ventilation pipe includes an air inlet pipe, a first branch pipe, and a second branch pipe. The air inlet pipe is connected to the cooling device. Both the first branch pipe and the second branch pipe are connected to the air inlet pipe. The first branch pipe is inclined upward and is connected to the combustion chamber of the hot air furnace. The second branch pipe is inclined downward and is connected to the slag discharge device.

[0013] In some embodiments, the first branch pipe is provided with a filter capable of filtering slag.

[0014] In some embodiments, the slag inlet device is a detachable interface, and the slag inlet device can be detachably connected to the cooling device.

[0015] In some embodiments, a first valve is provided between the slag inlet device and the slag outlet of the hot blast stove, and the first valve is a timed automatic valve.

[0016] In some embodiments, the slag outlet is provided with a second valve, which is a timed automatic valve.

[0017] Compared to the aforementioned background technology, the high-temperature slag automated processing and recycling system provided in this application includes a slag inlet device and a cooling component. The slag inlet device is connected to the slag discharge port of the hot blast stove. The cooling component includes a blowing device, a cooling device, and a ventilation pipe. The cooling device has a sealed cavity inside and is connected to the slag inlet device. The blowing device is located in the cooling device and can blow air into the sealed cavity. One end of the ventilation pipe is connected to the cooling device, and the other end is connected to the combustion chamber of the hot blast stove. The slag discharge port of the hot blast stove can discharge high-temperature slag. The high-temperature slag enters the cooling device through the slag inlet device. The blowing device draws in outside cold air and blows the air into the sealed cavity. The cold air passes through the high-temperature slag in the cooling device and exchanges heat with the high-temperature slag, thereby carrying away the heat of the slag and forming hot air. The hot air enters the combustion chamber of the hot blast stove through the ventilation pipe and participates in combustion in the combustion chamber. Furthermore, when the airflow passes through the slag in the cooling device, it can also carry away the dust mixed in with the slag, and transport the dust to the combustion chamber of the hot blast stove through the ventilation pipe, thereby avoiding the slag carrying a large amount of dust and thus avoiding dust pollution of the environment when the slag is discharged. The high-temperature slag automated treatment and recycling system of this application can reduce the temperature of the slag discharged from the hot blast stove, effectively utilize the residual heat of the slag, save energy and reduce consumption, and can separate the slag from the dust, achieving a dust-free slag discharge process and meeting environmental protection requirements. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the high-temperature slag automated treatment and recycling system according to an embodiment of this application.

[0020] in:

[0021] 1. Slag inlet device; 21. Blowing device; 22. Cooling device; 23. Ventilation pipe; 231. Air inlet pipe; 232. First branch pipe; 233. Second branch pipe; 3. Slag discharge device; 4. Metal mesh bag; 5. Filter; 6. First valve; 7. Second valve. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] It should be noted that the directional terms such as "upper end," "lower end," "left side," and "right side" mentioned below are defined based on the accompanying drawings in the instruction manual.

[0025] The high-temperature slag automated treatment and recycling system provided in this application embodiment includes a slag inlet device 1 and a cooling component. The slag inlet device 1 is connected to the slag discharge port of the hot blast stove. The cooling component includes a blower 21, a cooling device 22, and a ventilation pipe 23. The cooling device 22 has a sealed cavity inside and is connected to the slag inlet device 1. The blower 21 is located in the cooling device 22 and can blow air into the sealed cavity. One end of the ventilation pipe 23 is connected to the cooling device 22, and the other end is connected to the combustion chamber of the hot blast stove.

[0026] Specifically, such as Figure 1 As shown, the cooling device 22 is a metal frame structure with a sealed cavity structure inside. The slag inlet device 1 is located at the top of the cooling device 22. The top of the sealed cavity has a slag inlet. The slag inlet device 1 is connected to the sealed cavity through the slag inlet. The blowing device 21 can be a conventional exhaust fan. The lower part of the left side wall of the cooling device 22 is provided with an air inlet. The air inlet is connected to the sealed cavity. The blowing device 21 is located inside the air inlet. The blowing device 21 draws in outside air and blows the outside cold air into the sealed cavity through the air inlet. The ventilation pipe 23 is located in the upper part of the right side wall of the cooling device 22. The ventilation pipe 23 is connected to the sealed cavity and is also connected to the combustion chamber of the hot blast stove.

[0027] Understandably, the slag discharge port of the hot blast stove can discharge high-temperature slag. The high-temperature slag enters the cooling device 22 through the slag inlet device 1. The blower 21 draws in cold air from the outside and blows it into the sealed cavity. The cold air passes through the high-temperature slag in the cooling device 22 and exchanges heat with it, thereby removing the heat from the slag and forming hot air. The hot air enters the combustion chamber of the hot blast stove through the ventilation pipe 23 and participates in combustion. In addition, when the airflow passes through the slag in the cooling device 22, it can also carry away the dust mixed in with the slag and transport the dust to the combustion chamber of the hot blast stove through the ventilation pipe 23, thereby avoiding the slag carrying a large amount of dust and thus avoiding dust pollution of the environment when the slag is discharged.

[0028] In some embodiments, the high-temperature slag automated processing and recycling system is further provided with a slag discharge device 3. The cooling device 22 has a slag outlet at the bottom, which is connected to the slag discharge device 3. The slag discharge device 3 can transport the slag to the next process.

[0029] Understandably, the cooled slag is discharged from the cooling device 22 through the slag outlet, thereby avoiding the accumulation of a large amount of slag in the cooling device 22. The slag discharge device 3 can transport the cooled slag to the next process, realizing automated slag transportation and avoiding slag accumulation.

[0030] Preferably, the slag discharge device 3 can be a screw conveyor, which includes a housing and an auger. The auger rotates and fits inside the housing, and a conveying channel can be formed between the auger and the side wall of the housing.

[0031] It is understandable that the slag discharged from the slag outlet enters the shell and collects in the conveying channel between the auger and the shell. When the auger rotates, it can push the slag in the conveying channel to move along the conveying channel, thereby discharging the slag from the slag discharge device 3.

[0032] In some embodiments, the cooling device 22 is provided with a metal mesh bag 4, the top of the metal mesh bag 4 is connected to the green cover inlet device, and the bottom of the metal mesh bag 4 is connected to the slag outlet.

[0033] Understandably, when the high-temperature slag enters the sealed cavity of the cooling device 22 through the slag inlet device 1, the high-temperature slag is located in the metal mesh bag 4. The metal mesh bag 4 can gather the high-temperature slag in the middle area of ​​the sealed cavity, preventing the high-temperature slag from accumulating at the bottom of the sealed space. This can increase the contact area between the slag and the air, improve the heat dissipation efficiency of the slag, and reduce the heat dissipation time of the slag.

[0034] Preferably, the metal mesh bag 4 is made of a flexible heat-resistant material.

[0035] Specifically, the metal mesh bag 4 can be made of 310S (0Cr25Ni20 / 1.4845) high-alloy austenitic stainless steel, which has good high-temperature resistance. At high temperatures (continuous use temperature up to 1150 degrees Celsius, intermittent use up to 1035 degrees Celsius), it exhibits excellent oxidation and peeling resistance, as well as high plasticity, toughness, and a certain degree of strength. The mesh size of the metal mesh bag 4 ranges from 10 to 40 mesh, corresponding to an aperture range of 2 mm to 0.45 mm, allowing dust in the slag to pass through the metal mesh bag 4, preventing it from intercepting the dust and achieving separation of dust from large particles of slag.

[0036] In some embodiments, the ventilation pipe 23 includes an air inlet pipe 231, a first branch pipe 232, and a second branch pipe 233. The air inlet pipe 231 is connected to the sealed cavity of the cooling device 22. The first branch pipe 232 and the second branch pipe 233 are both connected to the air inlet pipe 231. The first branch pipe 232 is inclined upward and is connected to the combustion chamber of the hot air furnace. The second branch pipe 233 is inclined downward and is connected to the slag discharge device 3.

[0037] Specifically, the air inlet pipe 231, the first branch pipe 232, and the second branch pipe 233 form a Y-shaped structure. The left end of the air inlet pipe 231 is connected to the right side wall of the cooling device 22. The air inlet pipe 231 is inclined, with its right end lower than its left end. The left ends of both the first branch pipe 232 and the second branch pipe 233 are connected to the right end of the air inlet pipe 231, thus forming a three-way structure. The first branch pipe 232 is inclined, with its right end higher than its left end. The right end of the first branch pipe 232 is connected to the combustion chamber of the hot air furnace. The right end of the second branch pipe 233 is lower than its left end. The slag discharge device 3 is connected to the end of the slag discharge device. The slag discharge device 3 can be a double-inlet single-outlet screw conveyor. Both ends of the slag discharge device 3 are provided with inlets. The inlet at the left end of the slag discharge device 3 is connected to the slag discharge port of the cooling device 22, and the inlet at the right end of the slag discharge device 3 is connected to the right end of the second branch pipe 233. The slag discharge device 3 has an outlet at its center. The auger of the slag discharge device 3 has two sections of auger blades with opposite rotation directions. When the auger rotates, it can push the slag on both sides of the slag discharge device 3 toward the center of the slag discharge device 3, so that the slag on both sides of the slag discharge device 3 can be discharged through the outlet at its center.

[0038] Understandably, when the blowing device 21 blows air into the cooling device 22, some small particles of slag and dust are carried by the airflow into the air inlet pipe 231. The hot airflow has an upward trend, so it will enter the combustion chamber of the hot blast stove through the first branch pipe 232. The slag particles carried in the airflow can fall to the right end of the slag discharge device 3 through the second branch pipe 233 under the action of gravity, thereby preventing the cooled slag from entering the combustion chamber and preventing the slag from affecting the combustion efficiency.

[0039] Based on the above embodiment, a filter 5 is provided inside the first branch pipe 232, and the filter 5 can filter slag.

[0040] It is understandable that when the airflow passes through the intersection of the first branch pipe 232 and the second branch pipe 233, some of the heavier slag can fall into the second branch pipe 233 under the action of gravity. The airflow will still carry the remaining lighter slag and dust into the first branch pipe 232. By setting up the filter 5, the filter 5 can intercept the lighter slag, thereby preventing this part of the lighter slag from entering the combustion chamber and affecting the combustion efficiency.

[0041] In some embodiments, the slag inlet device 1 is a detachable interface, and the slag inlet device 1 can be detachably connected to the cooling device 22.

[0042] It is understandable that after the cooling device 22 has been used for a long time, slag and dust that have not been discharged will inevitably accumulate inside it. At this time, the cooling device 22 can be removed from the slag inlet device 1, the inside of the cooling device 22 can be cleaned and reused to avoid the accumulation of a large amount of slag and dust inside the cooling device 22.

[0043] In some embodiments, a first valve 6 is provided between the slag inlet device 1 and the slag outlet of the hot blast stove. The first valve 6 is a timed automatic valve.

[0044] Under normal conditions, the first valve 6 is closed to prevent high-temperature slag from continuously entering the cooling device 22. When the preset time is reached, the temperature of the slag in the cooling device 22 drops to room temperature. At this time, the slag in the cooling device 22 is discharged from the slag outlet at the bottom of the cooling device 22. Then the first valve 6 is opened so that the next batch of high-temperature slag can enter the cooling device 22.

[0045] Based on the above embodiment, a second valve 7 is provided at the slag outlet, and the second valve 7 is a timed automatic valve.

[0046] Under normal circumstances, the second valve 7 is closed to prevent the slag in the cooling device 22 from being discharged before it reaches room temperature. When the preset time is reached, the second valve 7 opens, and the slag in the cooling device 22 can be discharged through the slag outlet. Then the second valve 7 closes, and the cooling device 22 can then cool the next batch of slag.

[0047] The specific steps for using the automated high-temperature slag treatment and recycling system provided in this application embodiment are as follows:

[0048] Before starting work, ensure that all connections between components are intact. Then, the first valve 6 is opened, and the high-temperature slag enters the cooling device 22 from the slag discharge port of the hot blast stove. The metal mesh bag 4 can catch the high-temperature slag. Then, the first valve 6 is closed, the blowing device 21 is started and blows outside air into the cooling device 22. The airflow exchanges heat with the high-temperature slag. The air is heated and the slag is cooled. When the air passes through the slag, it can carry the dust mixed in the slag and some slag to the air inlet pipe 231 of the ventilation pipe 23. The heated air can enter the combustion chamber through the first branch pipe 232 and be used as combustion air. At the same time, the air carries the dust back to the combustion chamber to avoid dust pollution. The filter 5 in the first branch pipe 232 can intercept the slag particles carried in the air. The slag falls into the second branch pipe 233 under the action of gravity and falls into the slag discharge device 3. When the temperature of the slag in the cooling device 22 drops to room temperature, the second valve 7 is opened, and the slag in the cooling device 22 enters the slag discharge device 3 through the slag outlet. The slag discharge device 3 discharges the slag inside.

[0049] In summary, the high-temperature slag automated treatment and recycling system provided in this application embodiment can reduce the temperature of the slag discharged from the hot blast stove and effectively utilize the residual heat of the slag, thereby saving energy and reducing consumption. It can also separate the slag from the dust, achieving a dust-free slag discharge process and meeting environmental protection requirements. Furthermore, it can achieve automated operation through timed automatic valves, avoiding manual operation, reducing labor intensity, and improving work efficiency.

[0050] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0051] The above provides a detailed description of the automated high-temperature slag treatment and recycling system provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the solution and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. An automated high-temperature slag processing and recycling system, characterized in that, include: Slag inlet device (1), wherein the slag inlet device (1) is connected to the slag discharge port of the hot blast stove; The cooling assembly includes a blower (21), a cooling device (22), and a ventilation pipe (23). The cooling device (22) has a sealed cavity inside and is connected to the slag inlet device (1). The blower (21) is located on the cooling device (22) and can blow air into the sealed cavity. One end of the ventilation pipe (23) is connected to the cooling device (22), and the other end is connected to the combustion chamber of the hot blast stove.

2. The high-temperature slag automated treatment and recycling system according to claim 1, characterized in that, It is also equipped with a slag discharge device (3), and the bottom of the cooling device (22) is provided with a slag outlet. The slag outlet is connected to the slag discharge device (3), and the slag discharge device (3) can transport the slag to the next process.

3. The high-temperature slag automated treatment and recycling system according to claim 2, characterized in that, The slag discharge device (3) is a screw conveyor.

4. The high-temperature slag automated treatment and recycling system according to claim 2, characterized in that, The cooling device (22) is equipped with a metal mesh bag (4), the top of the metal mesh bag (4) is connected to the slag inlet device (1), and the bottom of the metal mesh bag (4) is connected to the slag outlet.

5. The high-temperature slag automated treatment and recycling system according to claim 4, characterized in that, The metal mesh bag (4) is made of a flexible heat-resistant material.

6. The high-temperature slag automated treatment and recycling system according to claim 2, characterized in that, The ventilation pipe (23) includes an air inlet pipe (231), a first branch pipe (232), and a second branch pipe (233). The air inlet pipe (231) is connected to the cooling device (22). The first branch pipe (232) and the second branch pipe (233) are both connected to the air inlet pipe (231). The first branch pipe (232) is inclined upward and is connected to the combustion chamber of the hot air furnace. The second branch pipe (233) is inclined downward and is connected to the slag discharge device (3).

7. The high-temperature slag automated treatment and recycling system according to claim 6, characterized in that, The first branch pipe (232) is equipped with a filter (5), which is capable of filtering slag.

8. The automated high-temperature slag treatment and recycling system according to claim 2, characterized in that, The slag inlet device (1) is a detachable interface, and the slag inlet device (1) can be detachably connected to the cooling device (22).

9. The automated high-temperature slag treatment and recycling system according to claim 8, characterized in that, A first valve (6) is provided between the slag inlet device (1) and the slag outlet of the hot blast stove. The first valve (6) is a timed automatic valve.

10. The automated high-temperature slag treatment and recycling system according to claim 9, characterized in that, The slag outlet is equipped with a second valve (7), which is a timed automatic valve.

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