A stone-coal separation device

Abstract

This utility model discloses a stone-coal separation device, comprising: a primary hot air duct, a baffle plate assembly, an impeller, a chamber wall, and a bottom plate; the chamber wall is located on the bottom plate and is fixedly connected to the bottom plate, the impeller is fixedly connected to the chamber wall, and the impeller, chamber wall, and bottom plate form a slag chamber, the inlet of the primary hot air duct is located in the slag chamber; the inlet of the primary hot air duct is provided with an air duct bottom plate; the baffle plate assembly is located at the inlet of the primary hot air duct and is fixedly connected to the inlet of the primary hot air duct. In this utility model, the second baffle plate prevents coarse stone-coal particles from being thrown into the air duct inlet bottom plate and accumulating due to impeller rotation and centrifugal force, while the first baffle plate prevents coarse stone-coal particles from being thrown into the primary hot air duct inlet by centrifugal force during circular motion driven by the scraper, thus avoiding blockage of the primary hot air duct inlet.

Description

Technical Field

[0001] This utility model relates to the field of slag prevention and slag blockage technology, and in particular to a stone-coal separation device. Background Technology

[0002] Coal mills are core auxiliary equipment in industrial settings such as thermal power plants, coal chemical plants, and metallurgy. Their core function is to grind lumpy raw coal (or other solid fuels / materials) into uniform coal powder (or fine powder), enabling it to burn fully in equipment such as boilers and gasifiers, thereby improving energy utilization efficiency.

[0003] During the coal mill production process, unground coal particles are directly thrown into the inlet of the hot primary air duct by the centrifugal force of the scraper's circumferential motion or by the action of the rotating impeller. This results in severe slag accumulation at the inlet of the hot primary air duct. Unground coal particles will form large coke lumps at high temperatures, which will block the inlet of the hot primary air duct, reducing the airflow area and air volume. At the same time, large coal coke lumps are ground by the rotating scraper and fall into the slag discharge hole, causing blockage of the slag discharge hole.

[0004] Currently, to address the aforementioned issues, a grid plate is typically installed on the bottom plate of the slag chamber of the coal mill to prevent slag from caking at the inlet of the hot primary air duct. After the modification was implemented, regular inspections of each coal mill did not reveal large pieces of coke at the inlet of the hot primary air duct. However, this modification also exposed related problems during operation. For example, under the scouring effect of high-temperature primary air at the inlet of the hot primary air duct, the grid plate easily melts and eventually falls off, causing blockages in the slag discharge hole. Although this modification achieved some results, it did not fundamentally solve the problem. Utility Model Content

[0005] The purpose of this utility model is to provide a stone-coal separation device that uses a second baffle plate to prevent unground stone-coal from being thrown into the air duct inlet by the centrifugal force of the impeller, and uses a first baffle plate to prevent unground stone-coal from being thrown into the hot primary air duct inlet by the scraper, thus avoiding blockage of the hot primary air duct inlet.

[0006] This utility model is implemented by the following technical solution: a stone-coal separation device, comprising: Hot primary air duct, slag baffle assembly, impeller, scraper, cavity wall and bottom plate; The cavity wall is located on the bottom plate and is fixedly connected to the bottom plate. The impeller is fixedly connected to the cavity wall. The impeller, cavity wall, and bottom plate form a slag chamber. The impeller is axially connected to the bottom plate. The scraper is located on the rotating shaft of the impeller and is close to the bottom plate. The scraper is fixedly connected to the rotating shaft. The scrapers are arranged at intervals on the rotating shaft of the impeller. The inlet of the hot primary branch air duct is located in the slag chamber. The inlet of the hot primary branch air duct is provided with an air duct bottom plate. The slag baffle assembly is located at the inlet of the hot primary branch air duct and is placed at an angle. The slag baffle assembly is fixedly connected to the inlet of the hot primary branch air duct.

[0007] Furthermore, the slag baffle assembly is tilted towards the slag chamber.

[0008] Furthermore, the slag baffle assembly includes a first slag baffle and a second slag baffle; the first slag baffle is located at the bottom of the inlet of the hot primary branch air duct, the first slag baffle is fixedly connected to the bottom plate of the air duct, and the angle between the first slag baffle and the bottom plate along the direction parallel to the bottom plate is a first preset angle; the second slag baffle is located at the top of the inlet of the hot primary branch air duct, the second slag baffle is fixedly connected to the bottom plate of the air duct, and the angle between the second slag baffle and the bottom plate along the direction perpendicular to the bottom plate is a second preset angle.

[0009] Furthermore, the first preset angle is greater than or equal to 40° and less than or equal to 50°; the second preset angle is greater than or equal to 20° and less than or equal to 30°.

[0010] Furthermore, along the direction forming a first preset angle with the bottom plate, the size of the first slag baffle is greater than or equal to 20cm and less than or equal to 25cm; along the direction perpendicular to the bottom plate and along the direction forming a second preset angle with the bottom plate of the air duct, the size of the second slag baffle is greater than or equal to 15cm and less than or equal to 20cm.

[0011] Furthermore, slag discharge holes are provided on the bottom plate, which are close to the first slag baffle plate.

[0012] Advantages of this utility model: In this invention, the first baffle plate is located at the bottom of the inlet of the primary hot air duct, and the angle between the first baffle plate and the bottom plate is a first preset angle. When the unground coke is thrown onto the first baffle plate by the centrifugal force of the scraper, the inclined first baffle plate allows the unground coke to fall back onto the bottom plate naturally, effectively preventing the unground coke from entering the primary hot air duct, thereby avoiding the formation of large coke lumps at high temperatures; and preventing the inlet of the primary hot air duct 1 from being blocked. The second baffle plate is located at the bottom of the primary hot air duct. At the top of the branch air duct inlet, the second baffle plate forms a second preset angle with the bottom plate of the air duct. The second baffle plate prevents the stones and coal falling from the impeller from being thrown into the hot primary branch air duct inlet by centrifugal force. By setting the second baffle plate, the falling unground stones and coal change direction after passing through the baffle plate and fall into the slag chamber, avoiding accumulation at the hot primary branch air duct inlet. This prevents the unground stones and coal from forming large coke lumps at high temperatures and prevents large coke lumps from being ground by the rotating scraper and falling into the slag discharge hole, causing blockage. Simultaneously, the first and second baffle plates, without changing the air volume, reduce the air duct flow area to a certain extent, increase the air velocity, and reduce the possibility of unground stones and coal entering the hot primary branch air duct. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of a stone-coal separation device provided in an embodiment of this utility model; Figure 2 This is a schematic diagram of the slag chamber of a stone-coal separation device provided in an embodiment of this utility model; Figure 3 This is a schematic diagram of the slag chamber of a stone-coal separation device provided in an embodiment of this utility model; Figure 4 This is a schematic diagram of the structure of the first slag baffle and the second slag baffle provided in the embodiment of this utility model; 1. Hot primary air duct, 2. Impeller, 3. Cavity wall, 4. Bottom plate, 5. Air duct bottom plate, 6. Scraper, 7. Slag discharge hole, 8. Slag baffle assembly, 9. Rotating shaft, 80. Second slag baffle, 81. First slag baffle. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Figure 1 This is a schematic diagram of the structure of a stone-coal separation device provided in an embodiment of this utility model; Figure 2 This is a schematic diagram of the slag chamber of a stone-coal separation device provided in an embodiment of this utility model; Figure 3 This is a schematic diagram of the slag chamber of a stone-coal separation device provided in an embodiment of this utility model; Figure 4 This is a schematic diagram of the structure of the first and second slag-blocking plates provided in this embodiment of the utility model. See also: Figures 1-4 The stone-coal separation equipment includes: a primary hot air duct 1, a baffle plate assembly 8, an impeller 2, a scraper 6, a chamber wall 3, and a bottom plate 4; the chamber wall 3 is located on the bottom plate 4 and is fixedly connected to the bottom plate 4; the impeller 2 is fixedly connected to the chamber wall 3; the impeller 2, the chamber wall 3, and the bottom plate 4 form a slag chamber; the impeller 2 is axially connected to the bottom plate 4; the scraper 6 is located on the rotating shaft 9 of the impeller 2 and is close to the bottom plate 4; the scraper 6 is fixedly connected to the rotating shaft 9; the scrapers 6 are arranged at intervals on the rotating shaft 9 of the impeller; the inlet of the primary hot air duct 1 is located in the slag chamber; the inlet of the primary hot air duct 1 is provided with an air duct bottom plate 5; the baffle plate assembly 8 is located at the inlet of the primary hot air duct 1 and is placed at an angle; the baffle plate assembly 8 is fixedly connected to the inlet of the primary hot air duct 1.

[0017] The impeller 2 is used to transport the ground, qualified stone coal to the separator; the primary hot air duct 1 is used to provide a drying heat source for the coal grinding process and to transport qualified stone coal powder; the bottom plate 4 is provided with a slag discharge hole 7, which is used to discharge non-grindable impurities and large particles; the rotating shaft 9 of the impeller 2 is provided with a scraper 6, which is used to clean and directionally transport the material in the slag chamber; the slag baffle assembly 8 is inclined towards the slag chamber, and the slag baffle assembly 8 includes a first slag baffle 81 and a second slag baffle 80, with the first slag baffle 81 located at the inlet of the primary hot air duct 1. At the bottom of the bottom plate 4, and along the direction parallel to the bottom plate 4, the first baffle plate 81 forms a first preset angle with the bottom plate 4; the first baffle plate 81 is used to prevent unground stone coal from being thrown into the inlet of the hot primary branch air duct 1 under the centrifugal force of the scraper 6; the second baffle plate 80 is located at the top of the inlet of the hot primary branch air duct 1, and along the direction perpendicular to the bottom plate 4, the second baffle plate 80 forms a second preset angle with the bottom plate 5 of the air duct; the second baffle plate 80 is used to prevent unground stone coal from being thrown into the inlet of the hot primary branch air duct 1 under the centrifugal force of the impeller 2.

[0018] The first preset angle is greater than or equal to 40° and less than or equal to 50°; the second preset angle is greater than or equal to 20° and less than or equal to 30°. Along the direction forming the first preset angle with the bottom plate 4, the size of the first slag baffle 81 is greater than or equal to 20cm and less than or equal to 25cm; along the direction perpendicular to the bottom plate 4 and along the direction forming the second preset angle with the air duct bottom plate 5, the size of the second slag baffle 80 is greater than or equal to 15cm and less than or equal to 20cm.

[0019] The first preset angle is greater than or equal to 40° and less than or equal to 50°, which can effectively prevent ungrindable stones and coal from entering the hot primary branch air duct 1 from the bottom. At the same time, when ungrindable stones and coal are thrown onto the first baffle plate 81 by the scraper 6, the inclined first baffle plate 81 can allow the stones and coal to fall back onto the bottom plate 4 naturally. The size of the first baffle plate 81 is greater than or equal to 20cm and less than or equal to 25cm. This size can block most of the stones and coal thrown away by the scraper 6.

[0020] The second preset angle is greater than or equal to 20° and less than or equal to 30°, which can effectively prevent unground stones and coal from entering the hot primary air duct 1 from the top. At the same time, the unground stones and coal are thrown onto the second baffle plate 80 by the scraper, which allows the unground stones and coal to fall back to the bottom plate 4 naturally. The size of the second baffle plate 80 is greater than or equal to 15cm and less than or equal to 20cm. If the second baffle plate 80 is too long, it will reduce the flow area of ​​the hot primary air duct and affect the normal operation of the coal mill. If the second baffle plate 80 is too short, the baffle plate 80 will significantly weaken its baffle effect. Therefore, the size of the second baffle plate 80 is greater than or equal to 15cm and less than or equal to 20cm, which can block most of the stones and coal thrown up by the centrifugal force of the impeller 2.

[0021] Specifically, during the operation of the stone and coal separation equipment, after the grinding zone of the equipment grinds the stone and coal, the ungrindable stone and coal and impurities fall into the slag chamber through the gaps in the impeller. At this time, the impeller 2 is rotating, which drives the scraper 6 to rotate at the same time. The bottom plate 4 is fixed. Some of the stone and coal and impurities that fall into the slag chamber are thrown into the hot primary air duct 1 by the centrifugal force of the impeller 2. The second baffle plate 80 is located at the top of the inlet of the hot primary air duct 1, and along the direction perpendicular to the bottom plate 4, the angle between the second baffle plate 80 and the bottom plate 5 of the air duct is a second preset angle. This allows the ungrinded stone and coal and impurities to fall into the slag chamber after changing direction by the second baffle plate 80, thus preventing the ungrinded stone and coal and impurities from being thrown into the hot primary air duct 1 by the centrifugal force of the impeller 2. This also prevents the ungrinded stone and coal from forming large coke lumps at high temperatures and prevents the inlet of the hot primary air duct 1 from being blocked. Some of the ground stones and impurities fall into the bottom plate 4. Under the action of the scraper 6, some of the stones and impurities fall from the slag hole 7, while the rest are thrown into the hot primary air duct 1 by the impeller 2. The first baffle plate 81 is located at the bottom of the inlet of the hot primary air duct 1, and along a direction parallel to the bottom plate 4, the angle between the first baffle plate 81 and the bottom plate 4 is a first preset angle. This ensures that the stones and impurities not thrown onto the first baffle plate 81 by the scraper 6 during its circular motion return to the bottom plate 81 under its own gravity. The material flows into the slag chamber, where, under the action of the scraper, the stones and impurities that are blocked by the first baffle plate 81 fall from the slag hole 7, preventing them from accumulating at the inlet of the hot primary branch air duct 1; preventing the unground stones and coal from forming large coke lumps at high temperatures; preventing the inlet of the hot primary branch air duct 1 from being blocked, and discharging the unground stones and coal from the slag hole 7; the qualified stone and coal powder produced in the grinding zone passes through the airflow of the hot primary branch air duct 1, passes through the impeller 2, and passes upward through the grinding zone, conveying the qualified stone and coal powder upward to the separator, thus realizing the separation of powder and slag.

[0022] In this invention, the first baffle plate 81 is located at the bottom of the inlet of the primary hot air duct 1, and the angle between the first baffle plate 81 and the bottom plate 4 is a first preset angle. When unground coal is thrown onto the first baffle plate 81 by the centrifugal force of the scraper 6, the inclined first baffle plate 81 allows the unground coal to fall back onto the bottom plate 4 naturally, effectively preventing the unground coal from entering the primary hot air duct 1, thereby avoiding the formation of large coke lumps at high temperatures and preventing the inlet of the primary hot air duct 1 from being blocked. The second baffle plate 80 is located at the bottom of the primary hot air duct 1. At the top of the inlet of branch air duct 1, the second baffle plate 80 forms a second preset angle with the bottom plate 5 of the air duct. The second baffle plate 80 is used to prevent the stones and coal falling from the impeller 2 from being thrown into the inlet of the hot primary branch air duct 1 by centrifugal force. By setting the second baffle plate 80, the falling unground stones and coal change direction after passing through the second baffle plate 80 and fall into the slag chamber, avoiding them from accumulating at the inlet of the hot primary branch air duct 1. This prevents the unground stones and coal from forming large coke lumps at high temperatures and prevents large stones and coal coke lumps from being ground by the rotating scraper and falling into the slag hole 7, causing blockage. At the same time, the first baffle plate 81 and the second baffle plate 80, without changing the air volume, reduce the air duct flow area to a certain extent, increase the air velocity, and reduce the possibility of unground stones and coal entering the hot primary branch air duct 1.

[0023] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A stone-coal separation device, characterized in that, include: The primary air duct, baffle plate assembly, impeller, at least four scrapers, cavity wall and bottom plate; The cavity wall is located on the bottom plate and is fixedly connected to the bottom plate. The impeller is fixedly connected to the cavity wall. The impeller, cavity wall, and bottom plate form a slag chamber. The impeller is axially connected to the bottom plate. The scraper is located on the rotating shaft of the impeller and is close to the bottom plate. The scraper is fixedly connected to the rotating shaft. The scrapers are arranged at intervals on the rotating shaft of the impeller. The inlet of the hot primary branch air duct is located in the slag chamber. The inlet of the hot primary branch air duct is provided with an air duct bottom plate. The slag baffle assembly is located at the inlet of the hot primary branch air duct and is placed at an angle. The slag baffle assembly is fixedly connected to the inlet of the hot primary branch air duct.

2. The stone and coal separation equipment according to claim 1, characterized in that, The slag baffle assembly is tilted toward the slag chamber.

3. The stone and coal separation equipment according to claim 1, characterized in that, The slag baffle assembly includes a first slag baffle and a second slag baffle; the first slag baffle is located at the bottom of the inlet of the hot primary branch air duct, the first slag baffle is fixedly connected to the bottom plate of the air duct, and the angle between the first slag baffle and the bottom plate along the direction parallel to the bottom plate is a first preset angle; the second slag baffle is located at the top of the inlet of the hot primary branch air duct, the second slag baffle is fixedly connected to the bottom plate of the air duct, and the angle between the second slag baffle and the bottom plate along the direction perpendicular to the bottom plate is a second preset angle.

4. The stone-coal separation equipment according to claim 3, characterized in that, The first preset angle is greater than or equal to 40° and less than or equal to 50°; the second preset angle is greater than or equal to 20° and less than or equal to 30°.

5. The stone-coal separation equipment according to claim 3, characterized in that, Along the direction forming a first preset angle with the bottom plate, the size of the first slag baffle is greater than or equal to 20cm and less than or equal to 25cm; along the direction perpendicular to the bottom plate and along the direction forming a second preset angle with the bottom plate of the air duct, the size of the second slag baffle is greater than or equal to 15cm and less than or equal to 20cm.

6. The stone-coal separation equipment according to claim 1, characterized in that, The bottom plate is provided with slag discharge holes, which are close to the first slag baffle plate.

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