A coal mill slagging device and method of use

Abstract

The application discloses a coal mill slag discharging device and a use method, and relates to the technical field of coal mill slag discharging treatment. The device comprises a slag discharging box body, which is sequentially provided with a feeding bin, a crushing bin, a connecting bin and a slag collecting bin from top to bottom. A double-roller crushing assembly is fixed in the crushing bin, and the double-roller crushing assembly comprises a driving structure and a double-roller structure. The driving structure drives a first tooth surface roller and a second tooth surface roller to rotate towards each other to extrude and crush slag. A spreading assembly is further fixed in the crushing bin above the double-roller crushing assembly, and the spreading assembly comprises a spreading plate and a screw rod assembly. A heat conduction assembly is assembled in the slag collecting bin, and the heat conduction assembly comprises a spiral metal heat conduction plate and heat conduction fins uniformly distributed on the spiral metal heat conduction plate. The application realizes uniform distribution of slag through the spreading assembly, realizes efficient crushing of slag through the double-roller crushing assembly, and realizes efficient cooling of slag through the heat conduction assembly, thereby improving the slag discharging efficiency and the equipment operation stability.

Description

Technical Field

[0001] This invention belongs to the field of coal mill slag treatment technology, and in particular relates to a coal mill slag discharge device and its usage method. Background Technology

[0002] Coal mills are essential auxiliary equipment for crushing and grinding coal into pulverized coal, widely used in coal-fired power plants and various industrial boiler systems. Medium-speed coal mills (such as disc mills, bowl mills, E-type mills, and roller mills) are commonly used due to their compact structure and high energy efficiency. Their core working principle involves two sets of relatively moving grinding components squeezing and grinding the coal to the required fineness. During the grinding process, ingrids such as stones and gangue mixed in with the raw coal are carried by the airflow into the primary air chamber of the mill along with the pulverized coal. These impurities need to be periodically discharged through a slag discharge device to ensure the normal operation and output efficiency of the mill. However, the slag entering the slag discharge device during the slag discharge process is usually at a high temperature and has varying particle sizes. How to achieve efficient crushing and sufficient cooling of the slag, while preventing its accumulation and agglomeration in the slag discharge channel and collection bin, has always been a pressing technical challenge in this field.

[0003] To address the aforementioned problems, some improvements have been proposed in related technologies. For example, Chinese Patent CN119158686B discloses a coal mill slag discharge device. This device uses a fan wheel installed in the main slag discharge channel to rotate and disperse the slag, and utilizes an inclined screen plate to separate coal powder from impurities such as gravel. Simultaneously, a fan supplies air into the main channel to cool the slag and accelerate its descent. This solution improves the coal powder recovery rate during slag discharge to some extent and partially alleviates the cooling requirements of the slag. However, this device still has the following shortcomings in practical use: 1. Existing slag discharge devices lack uniform distribution of slag before it enters the crushing zone. Slag tends to accumulate in the middle of the channel and fall in a concentrated manner, resulting in uneven distribution of the crushing and screening loads, which affects the efficiency of subsequent processing. 2. Although the existing slag discharge device achieves air cooling through a blower, the cooling effect of air cooling alone is limited for slag with high temperature. The slag is still at a high temperature when discharged, which poses certain safety hazards and is also not conducive to subsequent transportation and storage. 3. In the existing slag discharge device, the crushed slag falls directly into the collection area without cooling and anti-caking treatment during the collection process. The slag is prone to accumulating and agglomerating in the collection bin, which affects the smoothness of slag discharge.

[0004] To address these issues, we provide a coal mill slag discharge device and its usage method. Summary of the Invention

[0005] The purpose of this invention is to provide a slag discharge device and its usage method for a coal mill. The slag is evenly spread by a spreading component and then fed into a double-roll crushing component for compression and crushing. A heat-conducting component with a spiral metal heat-conducting plate and heat-conducting fins is installed in the slag collection bin to conduct three-dimensional heat conduction and cooling of the crushed slag from the inside out. At the same time, a double-layer cooling structure combining water cooling and air cooling on the inner wall of the slag collection bin is used to achieve efficient cooling. This invention solves the problems of uneven slag distribution leading to low crushing efficiency, insufficient cooling of high-temperature slag, and easy accumulation and agglomeration of slag in the collection bin of existing slag discharge devices.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention provides a slag discharge device for a coal mill and its usage method, including a slag discharge box. The slag discharge box comprises, from top to bottom, a feeding bin, a crushing bin, a connecting bin, and a slag collection bin. A feeding pipe is connected to the top of the feeding bin, and a discharge port is provided at the bottom of the slag collection bin. A double-roller crushing assembly is fixed inside the crushing bin. The double-roller crushing assembly includes a drive structure and a double-roller structure. The drive structure is fixed to the outer wall of the crushing bin. The double-roller structure includes a first toothed roller and a second toothed roller arranged side-by-side. The first and second toothed rollers are rotatably connected to... On the side wall of the crushing chamber, the drive structure drives the first toothed roller and the second toothed roller to rotate in opposite directions; inside the crushing chamber, located directly above the double-roller crushing assembly, there is also a material spreading assembly, which includes a material spreading plate and a lead screw assembly. The material spreading plate is connected to the lead screw of the lead screw assembly; inside the slag collection chamber, there is a heat conduction assembly, which includes a spiral metal heat conduction plate. The spiral metal heat conduction plate is set close to the inner wall of the slag collection chamber, and heat conduction fins are evenly distributed on the spiral metal heat conduction plate. Each heat conduction fin is inclined downward and points towards the center of the heat conduction assembly.

[0007] Furthermore, the top of both sides of the crushing chamber are provided with rail grooves, and the sliders at both ends of the top surface of the material spreading plate are slidably connected to the corresponding rail grooves.

[0008] Furthermore, mounting seats are fixed on both sides of the inner side wall of the crushing chamber. The mounting seats on both sides are mirrored. The top surface of each mounting seat is a downward sloping structure. The two sides of the spreading plate form material-accommodating gaps with the top surfaces of the corresponding mounting seats. A mounting groove is opened in the middle of the mounting seat, and the No. 1 toothed roller and the No. 2 toothed roller are respectively set in the mounting groove on the corresponding side.

[0009] Furthermore, both ends of the No. 1 toothed roller and the No. 2 toothed roller are respectively fixed with I-shaped seats, and the side wall of the crushing chamber is provided with mounting holes for the I-shaped seats to be installed. Each I-shaped seat passes through the corresponding mounting hole on the crushing chamber and is movably connected to the corresponding mounting hole.

[0010] Furthermore, the drive structure includes a servo motor and a drive gear. The servo motor is fixed on the outer wall of the crushing chamber, and the drive gear is fixed on the output shaft of the servo motor. A transmission gear is fixed at the same end of both the first and second toothed rollers. The first toothed roller and the drive gear are respectively distributed on both sides of the second toothed roller. The transmission gear on the second toothed roller meshes with the drive gear, and the transmission gear on the second toothed roller meshes with the transmission gear on the first toothed roller.

[0011] Furthermore, the No. 1 and No. 2 toothed rollers are each equipped with an independent cooling water chamber, and each I-beam seat has a through hole at its center that connects to the corresponding cooling water chamber; independent water supply pipes are connected to the through holes on the same side of the I-beam seat for the No. 1 and No. 2 toothed rollers, and independent drain pipes are connected to the through holes on the other side of the I-beam seat; the water supply pipes for the No. 1 and No. 2 toothed rollers are connected to an external water source through a double-ended connecting pipe and an electromagnetic water inlet valve, and the drain pipes for the No. 1 and No. 2 toothed rollers are connected to the drainage pipes through a double-ended connecting pipe and an electromagnetic drain valve.

[0012] Furthermore, the slag collection bin has a bucket-shaped structure, and its inner wall is provided with an inner interlayer space and an outer interlayer space from the inside to the outside. The top side of the inner interlayer space has a water inlet, and the bottom side of the inner interlayer space has a water outlet. The bottom side of the outer interlayer space has an air inlet, and the top side of the outer interlayer space has an air outlet. The water inlet of the inner interlayer space is connected to an external water source through a connecting pipe and an electromagnetic water inlet valve, and the water outlet of the inner interlayer space is connected to a drainage pipeline through a connecting pipe and an electromagnetic drain valve. The air inlet of the outer interlayer space is connected to an external air pump through a connecting pipe and an electromagnetic air inlet valve, and the air outlet of the outer interlayer space is connected to an exhaust pipeline through a connecting pipe and an electromagnetic exhaust valve.

[0013] Furthermore, the top surface of the heat-conducting fins has a knife-shaped structure, and there is a gap between the innermost end of each heat-conducting fin and the central axis of the heat-conducting component.

[0014] Furthermore, the top of the heat-conducting component is fixed with a top ring plate, and the bottom of the heat-conducting component is fixed with a bottom ring plate. The bottom ring plate is adapted to the turning arc surface of the bottom of the slag collection bin. A ring of evenly distributed operating rods is fixed around the periphery of the top ring plate. A ring of evenly distributed slots is opened on the top side of the slag collection bin. The rod of each operating rod passes through the corresponding slot, and the length of the slot is greater than the rod diameter of the operating rod. The operating rod includes a rod and a ball head. The ball head is covered with an anti-scalding sleeve.

[0015] This invention also relates to a method of using a coal mill ash discharge device, which is based on a coal mill ash discharge device and includes the following steps: S1: The slag material enters the feed hopper through the feed pipe and falls to the top of the mounting base; S2: Through the action of the screw assembly in the spreading assembly, the spreading plate is driven to move horizontally back and forth, spreading the slag material falling above the mounting base to both sides. The slag material flows through the sloping structure on the top surface of the mounting base to the material gap and falls onto the double roller crushing assembly. S3: The No. 1 toothed roller and the No. 2 toothed roller rotate relative to each other, squeezing and crushing the slag. The crushed slag falls into the slag collection bin through the connecting bin. S4: The slag falling into the slag collection bin comes into contact with the heat-conducting components. The spiral metal heat-conducting plate and heat-conducting fins conduct the heat in the slag to the inner wall of the slag collection bin. After the slag is temporarily stored and cooled in the slag collection bin for a preset time, it is discharged through the discharge port.

[0016] The present invention has the following beneficial effects: 1. By setting up a material spreading component, the present invention can evenly spread the slag falling into the mounting base through the feed pipe to both sides, so that the slag flows evenly along the sloping structure of the top surface of the mounting base to the material holding gap and falls onto the double roller crushing component. This structure ensures that the slag entering the double roller crushing component is evenly distributed, avoiding the problem of reduced crushing efficiency or equipment jamming due to local overload of the first and second toothed rollers, and significantly improving the uniformity of crushing and the stability of equipment operation.

[0017] 2. This invention features independent cooling water chambers inside the No. 1 and No. 2 toothed rollers. Each I-beam has a through-hole at its center connected to the corresponding cooling water chamber, and these are connected to independent water supply and drainage pipes. During the crushing process of the toothed rollers, circulating cooling water continuously flows through the cooling water chambers, providing real-time cooling to the toothed rollers. The low-temperature roller surface directly contacts the high-temperature slag, effectively carrying away some of the heat from the slag during crushing, thus achieving initial cooling. This effectively reduces the temperature of the slag entering the slag collection bin, lessening the burden on subsequent heat-conducting components and the jacketed cooling system. Simultaneously, the circulating cooling water effectively prevents the toothed rollers from overheating and being damaged due to prolonged contact with high-temperature slag, extending the equipment's service life.

[0018] 3. This invention, by assembling a heat-conducting component inside the slag collection bin, ensures that the high-temperature slag, after being crushed, falls into the bin and comes into full contact with the spiral-shaped metal heat-conducting plate and fins. The large amount of heat carried by the slag is rapidly conducted to the inner wall of the bin through the metal heat-conducting plate and fins for heat dissipation, achieving efficient passive cooling of the slag. Furthermore, as the slag continues to fall and pass through the bin, heat-conducting fins are distributed at different height levels within the slag, each fin capable of conducting heat to its respective height level. This spiral-shaped, longitudinally evenly distributed heat... The structure enables all-round three-dimensional heat conduction for slag materials of different depths and heights within the slag collection bin. Even when the slag materials are in a dynamic flow state within the slag collection bin, the heat-conducting fins of each layer can continuously conduct heat out of the slag materials passing through their respective layers. This avoids the problem of some slag materials not being able to dissipate heat due to excessive slag accumulation or uneven flow, ensuring that all layers of slag materials within the slag collection bin can be effectively cooled. Compared to simple air cooling, the setting of the heat-conducting components significantly improves cooling efficiency, effectively reduces the temperature of the discharged slag materials, and eliminates the safety hazards caused by high-temperature slag materials.

[0019] 4. This invention establishes an inner and outer interlayer space on the inner wall of the slag collection bin from the inside out. The inner interlayer space is circulated with cooling water to cool the inner wall of the slag collection bin, while the outer interlayer space is circulated with cooling airflow to cool the outer wall of the slag collection bin. This forms a dual-layer cooling structure that combines water cooling and air cooling. This structure works in conjunction with the internal heat-conducting components. After the heat-conducting components transfer the heat of the slag to the inner wall of the slag collection bin, the circulating cooling water in the inner interlayer space can quickly remove the heat, while the cooling airflow in the outer interlayer space further enhances the heat dissipation effect, thus achieving multi-stage and efficient cooling of the slag.

[0020] 5. This invention features a scissor-shaped structure on the top surface of the heat-conducting fins, with a gap between the innermost end of each fin and the central axis of the heat-conducting component. During the process of slag falling from the connecting chamber into the slag collection chamber, the scissor-shaped structure cuts and disperses the falling slag, preventing it from accumulating and agglomerating on the surface of the heat-conducting component. Simultaneously, a ring of evenly distributed control levers is fixed around the top ring plate, with each lever's shaft traversing a corresponding slot on the top side of the slag collection chamber. When slag shows a tendency to accumulate or agglomerate in the slag collection chamber, the operator can gently rotate the control levers back and forth along the length of the slot, causing the entire heat-conducting component to rotate slightly back and forth within the slag collection chamber. The spiral metal heat-conducting plate and fins agitate and loosen the slag, effectively preventing agglomeration and accumulation, and ensuring the fluidity of the slag within the slag collection chamber and smooth slag discharge. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0022] Figure 1 This is a schematic diagram of a coal mill slag discharge device.

[0023] Figure 2 This is a cross-sectional structural diagram of the slag collection bin.

[0024] Figure 3 This is a cross-sectional view of the slag collection bin, showing the internal structure of the heat-conducting components.

[0025] Figure 4 This is a schematic diagram of the thermal conductive component.

[0026] Figure 5 This is a schematic diagram of the structure of the heat-conducting fins.

[0027] Figure 6 This is a schematic diagram showing the structure of the double-roller crushing assembly distributed within the crushing chamber.

[0028] Figure 7 This is a cross-sectional view of the crushing chamber.

[0029] Figure 8 This is a schematic diagram of the drive structure and the transmission connection between the two-roller crushing assembly.

[0030] Figure 9 This is a cross-sectional structural diagram of the No. 1 toothed roller and the No. 2 toothed roller.

[0031] The attached diagram lists the components represented by each number as follows: 110. Feed pipe; 120. Feed hopper; 130. Crushing hopper; 131. Mounting base; 132. Mounting groove; 1301. Track groove; 140. Connecting hopper; 150. Slag collection hopper; 1501. Slotted opening; 1502. Discharge port; 151. Inner interlayer space; 1511. Water inlet; 1512. Water outlet; 152. Outer interlayer space; 1521. Air inlet; 1522. Air outlet; 200. Material spreading assembly; 210. Material spreading plate; 220. Screw assembly; 300. Double-roller crushing assembly; 310. Drive structure; 311. Servo motor; 312. Drive gear; 320. Double-roller structure; 321. No. 1 toothed roller; 322. No. 2 toothed roller; 301. Water chamber; 302. Transmission gear; 3011. Water supply pipe; 3012. Drainage pipe; 400, Heat-conducting component; 410, Spiral metal heat-conducting plate; 411, Heat-conducting fins; 4111, Knife-shaped surface; 420, Top ring plate; 421, Control lever; 430, Bottom ring plate. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0033] Example 1, please refer to Figure 1 , Figure 3 , Figure 4 , Figure 6 , Figure 7 and Figure 8 This invention relates to a slag discharge device for a coal mill, comprising a slag discharge box. The slag discharge box is arranged from top to bottom as follows: a feeding bin 120, a crushing bin 130, a connecting bin 140, and a slag collection bin 150. A feeding pipe 110 is connected to the top of the feeding bin 120, and a discharge port 1502 is provided at the bottom of the slag collection bin 150. A double-roller crushing assembly 300 is fixed inside the crushing bin 130. The double-roller crushing assembly 300 includes a drive structure 310 and a double-roller structure 320. The drive structure 310 is fixed to the outer wall of the crushing bin 130. The double-roller structure 320 includes a first toothed roller 321 and a second toothed roller 322 arranged side-by-side. The first toothed roller 321 and the second toothed roller 322 are rotatably connected to the side wall of the crushing bin 130. The drive structure 310 drives the first toothed roller 321 and the second toothed roller 322 to rotate in opposite directions.

[0034] like Figure 6 , Figure 7 and Figure 8 As shown, in this embodiment, a spreading assembly 200 is also fixed inside the crushing chamber 130 located directly above the double-roller crushing assembly 300. The spreading assembly 200 includes a spreading plate 210 and a lead screw assembly 220. The lead screw assembly 220 includes a drive motor and a lead screw. The drive motor is fixed to the side wall of one side inside the crushing chamber 130. One end of the lead screw is rotatably connected to the side wall of the other side of the crushing chamber 130. The lead screw passes through the connecting hole of the spreading plate 210 and is threadedly connected to the spreading plate 210. The drive motor drives the lead screw to rotate back and forth, and the lead screw drives the spreading plate 210 to move horizontally back and forth along the track groove 1301. The top of both sides of the crushing chamber 130 is provided with a track groove 1301, and the sliders at both ends of the top surface of the spreading plate 210 are slidably connected to the corresponding track groove 1301. The two sides of the crushing chamber 130 are fixed with mounting seats 131, which are mirror images of each other. The top surface of each mounting seat 131 is a downward sloping structure. The two sides of the spreading plate 210 form a material-accommodating gap with the top surface of the corresponding mounting seat 131. The middle of the mounting seat 131 is provided with a mounting groove 132, and the first toothed roller 321 and the second toothed roller 322 are respectively set in the mounting groove 132 on the corresponding side.

[0035] like Figure 3 and Figure 4As shown, in this embodiment, a heat-conducting component 400 is installed inside the slag collection bin 150. The heat-conducting component 400 includes a spiral metal heat-conducting plate 410, which is disposed close to the inner wall of the slag collection bin 150. Heat-conducting fins 411 are evenly distributed on the spiral metal heat-conducting plate 410, and each heat-conducting fin 411 is inclined downward and points towards the center of the heat-conducting component 400.

[0036] In this embodiment, the working principle of the entire device is as follows: After the high-temperature slag enters the feed hopper 120 through the feed pipe 110, it first falls into the crushing hopper 130 at the spreading assembly 200 located directly above the double-roll crushing assembly 300. The screw assembly 220 drives the spreading plate 210 to move horizontally back and forth, spreading the slag evenly. The slag falls evenly into the double-roll crushing assembly 300 through the material gap between the two sides of the spreading plate 210 and the top surface of the corresponding mounting seat 131. The drive structure 310 drives the first toothed roller 321 and the second toothed roller 322 to rotate in opposite directions, squeezing and crushing the slag falling between the first toothed roller 321 and the second toothed roller 322, reducing its particle size. The crushed slag falls through the connecting bin 140 into the slag collecting bin 150 for temporary storage. Heat-conducting fins 411 extend from the inner wall of the slag collecting bin 150 towards the center. During the temporary storage process, the heat-conducting fins 411 are enveloped by the slag and directly penetrate deep into the slag pile. The heat-conducting fins 411 directly conduct the heat accumulated inside the slag in contact with them to the spiral metal heat-conducting plate 410, and then through the spiral metal heat-conducting plate 410 to the inner wall of the slag collecting bin 150 for heat dissipation and cooling. Because the heat-conducting fins 411 are spiral... The extended direction of the metal heat-conducting plate 410 is spirally and evenly distributed longitudinally. Heat-conducting fins 411 are distributed at different levels in the height direction of the slag collection bin 150. When the slag accumulates to different heights in the slag collection bin 150, the heat-conducting fins 411 of each level extend into the interior of the slag at the corresponding height to conduct heat, thereby achieving three-dimensional heat conduction and cooling of slag at different depths and heights. This ensures that the heat inside the slag can be fully discharged, rather than just surface cooling. The cooled slag is finally discharged from the discharge port 1502.

[0037] Example 2, based on Example 1, please refer to... Figure 6 , Figure 7 , Figure 8 and Figure 9 In this embodiment, both ends of the first toothed roller 321 and the second toothed roller 322 are respectively fixed with I-shaped seats. The side wall of the crushing chamber 130 is provided with mounting holes for the I-shaped seats to be installed. Each I-shaped seat passes through the corresponding mounting hole on the crushing chamber 130 and is movably connected to the corresponding mounting hole.

[0038] like Figure 6 and Figure 8As shown, in this embodiment, the drive structure 310 includes a servo motor 311 and a drive gear 312. The servo motor 311 is fixed on the outer wall of the crushing chamber 130, and the drive gear 312 is fixed on the output shaft of the servo motor 311.

[0039] like Figure 8 As shown, in this embodiment, a transmission gear 302 is fixed at the same end of both the first toothed roller 321 and the second toothed roller 322. The first toothed roller 321 and the drive gear 312 are respectively distributed on both sides of the second toothed roller 322. The transmission gear 302 on the second toothed roller 322 meshes with the drive gear 312, and the transmission gear 302 on the second toothed roller 322 meshes with the transmission gear 302 on the first toothed roller 321.

[0040] like Figure 6 , Figure 8 and Figure 9 As shown, in this embodiment, the first toothed roller 321 and the second toothed roller 322 are respectively provided with independent cooling water chambers 301. The center of each I-beam seat is provided with a through hole that communicates with the corresponding cooling water chamber 301. Independent water supply pipes 3011 are respectively connected to the through holes of the I-beam seat on the same side of the first toothed roller 321 and the second toothed roller 322, and independent drain pipes 3012 are respectively connected to the through holes of the I-beam seat on the other side. The water supply pipes 3011 of the first toothed roller 321 and the second toothed roller 322 are connected to the water source through a double-ended connecting pipe and an electromagnetic water inlet valve. The drain pipes 3012 of the first toothed roller 321 and the second toothed roller 322 are connected to the drainage pipeline through a double-ended connecting pipe and an electromagnetic drain valve.

[0041] In this embodiment, the cooling principle of the dual-roller crushing assembly 300 is as follows: After the servo motor 311 starts, the drive gear 312 on its output shaft drives the transmission gear 302 on the meshing second toothed roller 322 to rotate. At the same time, the transmission gear 302 on the second toothed roller 322 drives the transmission gear 302 on the meshing first toothed roller 321 to rotate in the opposite direction, thereby realizing the opposite rotation of the first toothed roller 321 and the second toothed roller 322 to crush the slag. During the crushing process, cooling water enters the independent cooling water chambers 301 inside the No. 1 toothed roller 321 and the No. 2 toothed roller 322 through the water supply pipe 3011 and the through hole in the center of the I-shaped seat. The No. 1 toothed roller 321 and the No. 2 toothed roller 322 continuously circulate water to cool down the No. 1 toothed roller 321 and the No. 2 toothed roller 322 directly contact the slag through the low temperature roller surface, and conduct away the large amount of heat carried by the slag, thereby initially cooling the slag in the crushing process, reducing the temperature of the slag entering the slag collection bin 150, and reducing the burden on the subsequent cooling process. Meanwhile, the circulating cooling water effectively prevents the toothed roller from overheating and being damaged due to long-term contact with high-temperature slag, thus extending the service life of the equipment. In addition, the high-temperature water discharged through the drain pipe 3012 can be transported to external heat-requiring devices through corresponding drainage pipelines, such as preheating and drying the raw coal entering the coal mill, or serving as a supplementary heat source for the power plant's heating system, thereby realizing the secondary utilization of heat and reducing overall energy consumption.

[0042] Example 3, based on Examples 1 and 2, please refer to... Figure 1 , Figure 2 and Figure 3 In this embodiment, the slag collection bin 150 has a bucket-shaped structure. The inner wall of the slag collection bin 150 is provided with an inner interlayer space 151 and an outer interlayer space 152 sequentially from the inside to the outside. A water inlet 1511 is provided on the top side of the inner interlayer space 151, and a water outlet 1512 is provided on the bottom side of the inner interlayer space 151. An air inlet 1521 is provided on the bottom side of the outer interlayer space 152, and an air outlet 1522 is provided on the top side of the outer interlayer space 152. The water inlet 1511 of the inner interlayer space 151 is connected to a water source via a connecting pipe and an electromagnetic water inlet valve, and the water outlet 1512 of the inner interlayer space 151 is connected to a drainage pipeline via a connecting pipe and an electromagnetic drain valve. The air inlet 1511 of the outer interlayer space 152 is connected to a drainage pipeline. 21 An external air pump is connected through a connecting pipe and an electromagnetic air inlet valve. The air outlet 1522 of the outer interlayer space 152 is connected to an exhaust pipe through a connecting pipe and an electromagnetic exhaust valve. The electromagnetic water inlet valve, electromagnetic drain valve, electromagnetic air inlet valve and electromagnetic exhaust valve are all electrically connected to a controller. The control logic is as follows: When the slag discharge device of the coal mill is started, the electromagnetic water inlet valve and the electromagnetic air inlet valve open simultaneously, and the cooling water and cooling air flow are respectively introduced into the inner interlayer space 151 and the outer interlayer space 152. When the slag discharge device of the coal mill stops running, the electromagnetic water inlet valve and the electromagnetic air inlet valve close after a delay, and the electromagnetic drain valve and the electromagnetic exhaust valve close after a preset time delay, so as to completely discharge the residual water and residual gas in the interlayer space.

[0043] In this embodiment, the cooling working principle of the slag collection bin 150 is as follows: During normal use, cooling water enters from the top inlet 1511 and exits from the bottom outlet 1512 in the inner interlayer space 151. The water flows from top to bottom, utilizing the natural flow characteristics of gravity to achieve smooth circulation and circulate water to cool the inner wall of the slag collection bin 150. At this time, the cooling water temperature is lowest when it enters from the top, while the slag temperature is highest in the corresponding area. As the water flows downward, the water temperature gradually increases, and when it is discharged from the bottom outlet 1512, it carries a large amount of heat, achieving efficient heat exchange. Simultaneously, cooling airflow enters from the bottom air inlet 1521 and exits from the top air outlet 1522 in the outer interlayer space 152, providing air cooling to the outer wall of the slag collection bin 150. At this time, the airflow direction is from bottom to top, forming a counter-flow with the flow direction of cooling water in the inner interlayer space 151. That is, the water flow in the inner interlayer is from top to bottom, and the airflow in the outer interlayer is from bottom to top. This counter-flow structure can make full use of the temperature gradient to maximize heat exchange efficiency: the water with the lowest temperature in the inner interlayer and the air with the highest temperature in the outer interlayer meet at the top, and the water with the highest temperature in the inner interlayer and the air with the lowest temperature in the outer interlayer meet at the bottom, so that the cooling media on both sides can maintain a large temperature difference at each height layer, thereby significantly improving the heat exchange rate. At the same time, the airflow from bottom to top utilizes the buoyancy force of the hot air rising naturally, reducing the energy consumption of the air supply. Therefore, after the crushed high-temperature slag falls into the slag collection bin 150, the heat-conducting component 400 conducts the heat inside the slag to the inner wall of the slag collection bin 150. The heat on the inner wall is then quickly absorbed and carried away by the circulating cooling water in the inner interlayer space 151. The remaining heat that is not completely carried away by the water cooling is further transferred to the outer interlayer space 152 and carried away by the cooling airflow flowing from bottom to top. This constructs a complete four-stage heat transfer path: First, the heat-conducting fins 411 extend into the slag and directly conduct heat to the spiral metal heat-conducting plate 410; second, the spiral metal heat-conducting plate 410 transfers heat to the bin wall of the slag collection bin 150; third, the circulating cooling water in the inner interlayer space 151 absorbs and carries away the heat from the bin wall; finally, the cooling airflow in the outer interlayer space 152 provides auxiliary air cooling for the bin wall. The four-stage heat transfer is progressive and mutually supportive, achieving all-round, step-by-step cooling from the inside to the outside of the slag, while also efficiently cooling the slag collection bin 150. In addition, the high-temperature water that has completed heat exchange in the inner interlayer space 151 is discharged through the bottom outlet 1512. Since the outlet 1512 is located on the bottom side, it can ensure that the water in the inner interlayer space 151 is always in a flowing state, avoiding the accumulation of hot water at the bottom and affecting the heat exchange efficiency. The hot air in the outer interlayer space 152 is discharged through the top air outlet 1522. Since the air outlet 1522 is located on the top side, it can make full use of the characteristic of hot air rising to dissipate heat in a timely manner, avoiding the accumulation of hot air inside the interlayer and causing a decrease in heat dissipation efficiency. Afterwards, the high-temperature water that has completed heat exchange and absorbed the heat of the slag is transported to the external heat-requiring device through the corresponding drainage pipeline. It can be used as a preheating medium for the pre-drying treatment of raw coal at the front end of the coal mill, or integrated into the hot water supply system of the power plant area. In addition, the air heated by indirect heat exchange with the high-temperature water in the inner interlayer space 151 is discharged from the exhaust pipeline and can be used as a drying medium or auxiliary heat source for other processes, realizing the cascade recovery and utilization of heat and avoiding energy waste.

[0044] Example 4, based on Examples 1, 2 and 3, please refer to... Figure 3 , 4 and Figure 5 In this embodiment, the top surface of the heat-conducting fin 411 is a sharp blade surface 4111 structure. There is a gap between the innermost end of each heat-conducting fin 411 and the central axis of the heat-conducting assembly 400. The heat-conducting fin 411 and the spiral metal heat-conducting plate 410 are integrally formed structures. Both are made of heat-resistant stainless steel to ensure good thermal conductivity, corrosion resistance and structural strength when used for a long time in a high-temperature slag environment.

[0045] like Figure 3 As shown, in this embodiment, a top ring plate 420 is fixed to the top of the heat-conducting component 400, and a bottom ring plate 430 is fixed to the bottom of the heat-conducting component 400. The bottom ring plate 430 is adapted to the turning arc surface at the bottom of the slag collection bin 150.

[0046] like Figure 3 and Figure 4 As shown, in this embodiment, a ring of evenly distributed operating rods 421 is fixed around the periphery of the top ring plate 420, and a ring of evenly distributed slots 1501 is opened on the top side of the slag collection bin 150. The rod part of each operating rod 421 passes through the corresponding slot 1501. The length of the slot 1501 is greater than the rod diameter of the rod part of the operating rod 421. The operating rod 421 includes a rod part and a ball head. The ball head is covered with a heat-proof sleeve, which serves as a heat insulation and protection function.

[0047] In this embodiment, the working principle of the heat-conducting component 400 is as follows: When the slag falls from the connecting bin 140 into the slag collection bin 150, it first comes into contact with the heat-conducting fins 411 evenly distributed on the spiral metal heat-conducting plate 410. The sharp blade surface 4111 structure on the top surface of the heat-conducting fins 411 plays a cutting role in the slag during the slag falling process, making it difficult for the slag to accumulate and clump on the surface of the heat-conducting component 400, which is conducive to the slag falling evenly and dispersed into the bottom of the slag collection bin 150. In addition, when the slag tends to accumulate or clump in the slag collection bin 150, the operator holds the ball head of the control lever 421 and rotates the control lever 421 slightly back and forth in an arc along the length of the slot 1501. This causes the entire heat-conducting assembly 400 to rotate slightly back and forth in the slag collection bin 150. The spiral metal heat-conducting plate 410 and heat-conducting fins 411 are used to stir and loosen the slag, effectively preventing the slag from clumping and accumulating, ensuring the fluidity of the slag in the slag collection bin 150, and helping the slag to be discharged smoothly from the discharge port 1502.

[0048] Example 5, please refer to Figures 1 to 9 This embodiment provides a method for using a coal mill slag discharge device, which is based on a coal mill slag discharge device and includes the following steps: S1: First, the high-temperature slag material is continuously fed into the feed hopper 120 from the feed pipe 110 and falls down to the mounting bases 131 on both sides of the crushing hopper 130 by gravity. S2: Subsequently, the screw assembly 220 drives the spreader plate 210 to move horizontally and reciprocally along the rail groove 1301 above the mounting base 131, spreading the slag accumulated on the top of the mounting base 131 evenly to both sides. The slag flows along the inclined slope structure of the top surface of the mounting base 131 to the material gap and falls evenly onto the double roller crushing assembly 300. S3: Next, the drive structure 310 drives the first toothed roller 321 and the second toothed roller 322 to rotate in opposite directions, squeezing and crushing the slag material falling between the two rollers. The particle size of the crushed slag material is significantly reduced, and it falls into the slag collection bin 150 through the connecting bin 140. S4: Finally, the slag falling into the slag collection bin 150 comes into full contact with the spiral metal heat-conducting plate 410 and heat-conducting fins 411 of the heat-conducting component 400. The heat in the slag is conducted to the inner wall of the slag collection bin 150 for heat dissipation and cooling. After the slag is temporarily stored and cooled in the slag collection bin 150 for a preset time, it is finally discharged through the discharge port 1502, completing the entire slag discharge process.

[0049] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A slag discharge device for a coal mill, comprising a slag discharge box, wherein the slag discharge box is provided with a feeding bin (120), a crushing bin (130), a connecting bin (140), and a slag collection bin (150) arranged sequentially from top to bottom, wherein a feeding pipe (110) is connected to the top of the feeding bin (120), and a discharge port (1502) is provided at the bottom of the slag collection bin (150), characterized in that: The crushing chamber (130) is equipped with a double-roller crushing assembly (300). The double-roller crushing assembly (300) includes a drive structure (310) and a double-roller structure (320). The drive structure (310) is fixed on the outer wall of the crushing chamber (130). The double-roller structure (320) includes a first toothed roller (321) and a second toothed roller (322) arranged side by side. The first toothed roller (321) and the second toothed roller (322) are rotatably connected to the side wall of the crushing chamber (130). The drive structure (310) drives the first toothed roller (321) and the second toothed roller (322) to rotate in opposite directions. Inside the crushing chamber (130) located directly above the double-roll crushing assembly (300), there is also a spreading assembly (200). The spreading assembly (200) includes a spreading plate (210) and a lead screw assembly (220). The spreading plate (210) is connected to the lead screw of the lead screw assembly (220). The slag collection bin (150) is equipped with a heat-conducting component (400). The heat-conducting component (400) includes a spiral metal heat-conducting plate (410). The spiral metal heat-conducting plate (410) is arranged close to the inner wall of the slag collection bin (150). Heat-conducting fins (411) are evenly distributed on the spiral metal heat-conducting plate (410). Each heat-conducting fin (411) is inclined downward and points towards the center of the heat-conducting component (400).

2. The slag discharge device for a coal mill according to claim 1, characterized in that, The top of both sides of the crushing chamber (130) is provided with a track groove (1301), and the sliders at both ends of the top surface of the spreading plate (210) are respectively slidably connected to the track groove (1301) on the corresponding side.

3. The slag discharge device for a coal mill according to claim 2, characterized in that, Mounting seats (131) are fixed on both sides of the crushing chamber (130). The mounting seats (131) on both sides are mirror images of each other. The top surface of each mounting seat (131) is a downward sloping structure. The two sides of the spreading plate (210) form material-accommodating gaps with the top surfaces of the corresponding mounting seats (131). The mounting base (131) has a mounting groove (132) in the middle, and the first toothed roller (321) and the second toothed roller (322) are respectively set in the mounting groove (132) on the corresponding side.

4. A coal mill slag discharge device according to claim 3, characterized in that, Both ends of the first toothed roller (321) and the second toothed roller (322) are respectively fixed with I-shaped seats. The side wall of the crushing chamber (130) is provided with mounting holes for the I-shaped seats to be installed. Each I-shaped seat passes through the corresponding mounting hole on the crushing chamber (130) and is movably connected to the corresponding mounting hole.

5. A slag discharge device for a coal mill according to claim 4, characterized in that, The drive structure (310) includes a servo motor (311) and a drive gear (312). The servo motor (311) is fixed on the outer wall of the crushing chamber (130), and the drive gear (312) is fixed on the output shaft of the servo motor (311). A transmission gear (302) is fixed at the same end of both the first toothed roller (321) and the second toothed roller (322). The first toothed roller (321) and the drive gear (312) are respectively distributed on both sides of the second toothed roller (322). The transmission gear (302) on the second toothed roller (322) meshes with the drive gear (312), and the transmission gear (302) on the second toothed roller (322) meshes with the transmission gear (302) on the first toothed roller (321).

6. A coal mill slag discharge device according to claim 5, characterized in that, The first toothed roller (321) and the second toothed roller (322) are respectively provided with independent cooling water chambers (301), and each of the I-shaped seats has a through hole at the center position that is connected to the corresponding cooling water chamber (301); The first toothed roller (321) and the second toothed roller (322) are respectively connected to independent water supply pipes (3011) in the through holes of the I-shaped seat on the same side, and are respectively connected to independent drain pipes (3012) in the through holes of the I-shaped seat on the other side. The water supply pipes (3011) of the first toothed roller (321) and the second toothed roller (322) are connected to an external water source through a double-ended connecting pipe and an electromagnetic water inlet valve. The drain pipes (3012) of the first toothed roller (321) and the second toothed roller (322) are connected to a drainage pipeline through a double-ended connecting pipe and an electromagnetic drain valve.

7. A coal mill slag discharge device according to claim 6, characterized in that, The slag collection bin (150) has a bucket-shaped structure, and the inner wall of the slag collection bin (150) is provided with an inner interlayer space (151) and an outer interlayer space (152) from the inside to the outside. The inner interlayer space (151) has an inlet (1511) on the top side and an outlet (1512) on the bottom side. An air inlet (1521) is provided on the bottom side of the outer interlayer space (152), and an air outlet (1522) is provided on the top side of the outer interlayer space (152). The inlet (1511) of the inner interlayer space (151) is connected to an external water source through a connecting pipe and an electromagnetic water inlet valve, and the outlet (1512) of the inner interlayer space (151) is connected to a drainage pipeline through a connecting pipe and an electromagnetic drain valve. The air inlet (1521) of the outer interlayer space (152) is connected to an external air pump through a connecting pipe and an electromagnetic air inlet valve, and the air outlet (1522) of the outer interlayer space (152) is connected to an exhaust pipe through a connecting pipe and an electromagnetic exhaust valve.

8. A slag discharge device for a coal mill according to claim 7, characterized in that, The top surface of the heat-conducting fins (411) is a knife-edge (4111) structure, and there is a gap between the innermost end of each heat-conducting fin (411) and the central axis of the heat-conducting assembly (400).

9. A slag discharge device for a coal mill according to claim 8, characterized in that, The top of the heat-conducting component (400) is fixed with a top ring plate (420), and the bottom of the heat-conducting component (400) is fixed with a bottom ring plate (430). The bottom ring plate (430) is adapted to the turning arc surface at the bottom of the slag collection bin (150). A ring of evenly distributed operating levers (421) is fixed around the periphery of the top ring plate (420), and a ring of evenly distributed slots (1501) is opened on the top side of the slag collection bin (150). The rod part of each operating lever (421) passes through the corresponding slot (1501), and the length of the slot (1501) is greater than the rod diameter of the operating lever (421). The control lever (421) includes a lever and a ball head, with a heat-resistant sleeve covering the outside of the ball head.

10. A method of using a slag discharge device for a coal mill, characterized in that, The slag discharge device for a coal mill as described in any one of claims 1-9 comprises the following steps: S1: The slag material enters the feed hopper (120) through the feed pipe (110) and falls to the top of the mounting base (131); S2: Through the action of the screw assembly (220) in the spreading assembly (200), the spreading plate (210) is driven to move horizontally back and forth, spreading the slag material that falls above the mounting base (131) to both sides. The slag material flows to the material gap through the slope structure of the top surface of the mounting base (131) and falls onto the double roller crushing assembly (300). S3: The first toothed roller (321) and the second toothed roller (322) rotate relative to each other, squeezing and crushing the slag. The crushed slag falls into the slag collection bin (150) through the connecting bin (140). S4: The slag falling into the slag collection bin (150) comes into contact with the heat-conducting component (400). The spiral metal heat-conducting plate (410) and heat-conducting fins (411) conduct the heat in the slag to the inner wall of the slag collection bin (150). After the slag is temporarily stored and cooled in the slag collection bin (150) for a preset time, it is discharged through the discharge port (1502).

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