Pulverized coal circulating drying furnace

Abstract

The utility model provides a pulverized coal circulation drying furnace, and relates to the field of circulation drying furnaces, the pulverized coal circulation drying furnace comprises a circulation drying furnace main body, a feed hopper and a discharge hopper, and circular shafts are symmetrically connected in the circulation drying furnace main body in a staggered manner in a penetrating manner. In the process that a first motor is started to drive a circular shaft and a conveying belt to rotate to convey pulverized coal, after the pulverized coal is conveyed to a certain position, a driving mechanism is started to drive an impeller to rotate on the top of the conveying belt on the inner wall of the circulating drying furnace body, and the conveyed pulverized coal is scraped and raised; the pulverized coal attached to one side of the conveying belt can also make full contact with hot air, the situation that the pulverized coal is attached to the surface of the conveying belt is avoided, the drying effect and efficiency are improved, after the impeller rotates to a certain position, the blades knock on the rotating plate, the blades vibrate, the situation that the pulverized coal is attached to the blades of the impeller during raising is avoided, and the raising effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of circulating drying furnaces, and in particular to a coal powder circulating drying furnace. Background Technology

[0002] A circulating dryer is a device that dries materials through circulating airflow or other heat transfer methods. By continuously recycling hot air or other heat media, it can efficiently remove moisture from materials.

[0003] When using a circulating dryer to dry pulverized coal, the pulverized coal is fed into the furnace from the feed hopper and falls onto the conveyor belt. The heating and drying mechanism inside the furnace generates hot air, which then enters the inner wall of the furnace through internal vents. This hot air exchanges heat with the pulverized coal conveyed on the conveyor belt, removing moisture and achieving the drying effect. Several motors drive the shafts and conveyor belt to rotate alternately, circulating and drying the pulverized coal. This ensures more thorough drying and improves processing efficiency. However, because the hot air initially contacts the surface pulverized coal on the conveyor belt but not the bottom pulverized coal near the belt, uneven drying occurs as the pulverized coal is conveyed, reducing both drying effect and efficiency. Utility Model Content

[0004] The technical problem this invention aims to solve is that, after coal powder falls onto the conveyor belt, hot air preferentially contacts the coal powder on the surface, but cannot contact the coal powder at the bottom near the conveyor belt. As a result, when the coal powder is conveyed on the conveyor belt, not all of it can fully contact the hot air inside the circulating dryer, leading to uneven drying and reduced drying effect and efficiency.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a coal powder circulating dryer, including a circulating dryer body, a feed hopper and a discharge hopper. Inside the circulating dryer body, circular shafts are symmetrically and interlaced. Conveyor belts are fitted onto the outer surfaces of two opposing circular shafts. A first motor is symmetrically arranged on one side of the circulating dryer body, and the output end of the first motor is fixedly connected to one end of one of the circular shafts. The feed hopper is located at the top of the circulating dryer body, and the discharge hopper is located at the bottom. An auxiliary device is installed inside the circulating dryer body. This auxiliary device uses an impeller rotating on the conveyor belt to scrape and lift the conveyed coal powder for auxiliary drying. An anti-clogging device is installed on the inner wall of the feed hopper. This anti-clogging device uses a scraper to move up and down against the inner wall of the feed hopper to scrape off the adhering coal powder, achieving the anti-clogging effect.

[0006] The aforementioned components achieve the following effects: When using the circulating dryer to dry pulverized coal, the pulverized coal is fed from the feed hopper into the interior of the circulating dryer, where it falls onto the conveyor belt. Then, the heating and drying mechanism inside the circulating dryer generates hot air, which enters the inner wall of the circulating dryer through the internal air outlet. This air exchanges heat with the pulverized coal conveyed on the conveyor belt, removing moisture and achieving the drying effect. Several primary motors drive the circular shaft and conveyor belt to rotate alternately, circulating and drying the pulverized coal. Simultaneously, with the aid of auxiliary devices, impellers rotate on the conveyor belt to scrape and lift the conveyed pulverized coal, further aiding in the drying process and improving the efficiency of the drying process.

[0007] Preferably, the auxiliary device includes several impellers, with both ends of the impellers penetrating the inner wall of the circulating drying oven body. A rotating plate is symmetrically rotatably connected to the inner wall of the circulating drying oven body. A torsion spring is sleeved on the outer surface of one end of the rotating plate, and both ends of the torsion spring are respectively fixedly installed in the rotating plate and the inner wall of the circulating drying oven body.

[0008] A drive mechanism, which is mounted on one side of the main body of the circulating drying oven, can drive the impeller to rotate on the transmission belt.

[0009] The effect achieved by the above-mentioned components is as follows: By setting up auxiliary devices, when the coal powder is conveyed to the transmission belt, the first motor is started to drive the round shaft and the transmission belt to rotate and convey the coal powder. When the coal powder is conveyed to a certain position, the drive mechanism is started to drive the impeller to rotate on the top of the transmission belt on the inner wall of the circulating drying furnace body. The conveyed coal powder is scraped off and lifted up, so that the coal powder adhering to one side of the transmission belt can also fully contact the hot air, avoiding adhesion to the surface of the transmission belt, thereby improving the drying effect and efficiency.

[0010] Preferably, the drive mechanism includes a first bracket, a second motor, and a worm gear. The first bracket is fixedly mounted on one side of the main body of the circulating drying oven. One end of the worm gear passes through the first bracket and is fixedly connected to the output end of the second motor. One end of the impeller is fixedly connected to a worm wheel, wherein the worm wheel and the worm gear mesh with each other, and the worm teeth on both ends of the worm gear are in opposite directions.

[0011] The effect achieved by the above components is as follows: by setting up a drive mechanism, the second motor can be started to drive the worm gear to rotate on the first support, and then drive the two worm wheels to rotate in opposite directions, driving the two adjacent impellers to rotate in opposite directions. In conjunction with the conveyor belt, the coal powder on the conveyor belt is lifted up so that it can fully contact the hot air inside the circulating dryer body, thereby improving the drying efficiency.

[0012] Preferably, a protective cover is rotatably connected to one side of the rotating plate. The protective cover is sleeved on the outer surface of the torsion spring and one end is fixedly connected to one side of the inner wall of the circulating drying oven body.

[0013] The effect achieved by the above components is that by setting up a protective cover, one end of the torsion spring and the rotating plate can be covered to prevent coal dust from getting stuck in the gaps of the torsion spring and affecting its use.

[0014] Preferably, one end of the impeller blades is rotatably connected to a circular roller.

[0015] The effect achieved by the above components is that by setting up the circular roller, the contact wear between the impeller blades and the rotating plate can be reduced, making it easier to push the rotating plate and improving the service life of both.

[0016] Preferably, the anti-blocking device includes a second bracket, which is fixedly connected to the top side of the feed hopper. An electric telescopic rod is fixedly connected to one side of the second bracket, and a scraper is fixedly connected to one end of the output rod of the electric telescopic rod inside the feed hopper.

[0017] The effect achieved by the above components is as follows: by setting up an anti-clogging device, when wet coal powder adheres to the inner wall of the feed hopper, the electric telescopic rod on the second support can be activated to drive the scraper to move up and down in the inner wall of the feed hopper, scraping off the coal powder adhering to the inner wall, avoiding accumulation and blockage of the inner wall of the feed hopper, and improving feeding efficiency.

[0018] Preferably, the longitudinal section of the scraper has triangular ends, and the width of the scraper gradually decreases from the outside to the inside.

[0019] The effect achieved by the above components is that by gradually reducing the width of the scraper from the outside to the inside, it is convenient for the scraper to scrape and clean the inner wall of the feed hopper, while not hindering the feeding of pulverized coal.

[0020] Preferably, the outer surface of the output rod of the electric telescopic rod is symmetrically and fixedly connected with reinforcing rods, and one end of the reinforcing rod is fixedly connected to one side of the scraper.

[0021] The effect achieved by the above components is that by setting up reinforcing rods, the connection area between the scraper and the output rod of the electric telescopic rod can be increased, making the connection more secure to prevent breakage and damage.

[0022] The beneficial effects of this utility model are:

[0023] By setting up auxiliary devices, during the process of conveying coal powder onto the transmission belt, the first motor is started to drive the round shaft and the transmission belt to rotate and convey the coal powder. When the coal powder is conveyed to a certain position, the drive mechanism is started to drive the impeller to rotate on the top of the transmission belt on the inner wall of the circulating drying furnace body. This scrapes and lifts the conveyed coal powder, so that the coal powder on the side of the transmission belt can also fully contact the hot air, avoiding adhesion to the surface of the transmission belt, thus improving the drying effect and efficiency. When the impeller rotates to a certain position, the blades will strike the rotating plate, causing the blades to vibrate, preventing the coal powder from adhering to the impeller blades when being lifted, thus improving the lifting effect. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the structure of this utility model.

[0026] Figure 2 This is a three-dimensional structural diagram of the main body of the circulating drying furnace of this utility model;

[0027] Figure 3 for Figure 2 An enlarged 3D structural diagram at point A in the middle;

[0028] Figure 4 This is a three-dimensional structural diagram of the scraper part of this utility model.

[0029] Legend: 1. Main body of circulating drying oven; 2. Auxiliary device; 3. Anti-clogging device; 4. Feed hopper; 5. Discharge hopper; 6. Round shaft; 7. First motor; 8. Conveyor belt; 21. Impeller; 22. Drive mechanism; 221. First support; 222. Second motor; 223. Worm gear; 224. Worm wheel; 23. Rotating plate; 24. Torsion spring; 25. Protective cover; 26. Round roller; 31. Second support; 32. Electric telescopic rod; 33. Scraper; 34. Reinforcing rod. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] Figure 1-4 The pulverized coal circulating dryer shown includes a circulating dryer body 1, a feed hopper 4, and a discharge hopper 5. Inside the circulating dryer body 1, circular shafts 6 are symmetrically and interlaced. Conveyor belts 8 are fitted onto the outer surfaces of two opposing circular shafts 6. A first motor 7 is arranged in an interlaced pattern on one side of the circulating dryer body 1. The output end of the first motor 7 is fixedly connected to one end of one of the circular shafts 6. The feed hopper 4 is located at the top of the circulating dryer body 1, and the discharge hopper 5 is located at the bottom. An auxiliary device 2 is installed inside the circulating dryer body 1. The auxiliary device 2 uses an impeller 21 rotating on the conveyor belt 8 to scrape and lift the conveyed pulverized coal for auxiliary drying. An anti-clogging device 3 is installed on the inner wall of the feed hopper 4. The anti-clogging device 3 uses a scraper 33 to scrape off the adhering pulverized coal by moving up and down against the inner wall of the feed hopper 4, achieving the anti-clogging effect. When using the circulating dryer body 1 to dry pulverized coal, the pulverized coal is fed into the interior of the circulating dryer body 1 from the feed hopper 4, where it falls onto the conveyor belt 8. Then, the heating and drying mechanism inside the circulating dryer body 1 is activated to generate hot air, which then enters the inner wall of the circulating dryer body 1 through the internal air outlet. This allows the pulverized coal conveyed on the conveyor belt 8 to exchange heat and remove moisture, achieving the drying effect. Several first motors 7 drive the circular shaft 6 and the conveyor belt 8 to rotate alternately to circulate and dry the pulverized coal. At the same time, with the help of the auxiliary device 2, the impeller 21 rotates on the conveyor belt 8 to scrape and lift the conveyed pulverized coal for auxiliary drying, making the drying more thorough and improving the efficiency of the drying process.

[0033] Figure 2 and Figure 3 The auxiliary device 2 shown includes several impellers 21. Both ends of the impellers 21 penetrate the inner wall of the circulating drying oven body 1. A rotating plate 23 is symmetrically rotatably connected to the inner wall of the circulating drying oven body 1. A torsion spring 24 is sleeved on the outer surface of one end of the rotating plate 23. The two ends of the torsion spring 24 are respectively fixedly installed in the rotating plate 23 and the inner wall of the circulating drying oven body 1.

[0034] A drive mechanism 22, mounted on one side of the circulating dryer body 1, drives the impeller 21 to rotate on the transmission belt. During the process of conveying pulverized coal onto the transmission belt, the first motor 7 starts, driving the shaft 6 and the conveyor belt 8 to rotate. Once the pulverized coal has been conveyed to a certain position, the drive mechanism 22 is activated, causing the impeller 21 to rotate on the top of the conveyor belt 8 on the inner wall of the circulating dryer body 1. This scrapes and lifts the conveyed pulverized coal, ensuring that the coal adhering to one side of the conveyor belt 8 also comes into full contact with the hot air, preventing it from adhering to the surface of the conveyor belt 8 and improving drying effect and efficiency.

[0035] Figure 2 and Figure 3 The drive mechanism 22 shown includes a first support 221, a second motor 222, and a worm gear 223. The first support 221 is fixedly mounted on one side of the circulating dryer body 1. One end of the worm gear 223 passes through the first support 221 and is fixedly connected to the output end of the second motor 222. One end of the impeller 21 is fixedly connected to a worm wheel 224, wherein the worm wheel 224 and the worm gear 223 mesh, and the worm teeth on both ends of the worm gear 223 are in opposite directions. By setting up the drive mechanism 22, the second motor 222 can be started to drive the worm gear 223 to rotate on the first support 221, which in turn drives the two worm wheels 224 to rotate in opposite directions, driving the two adjacent impellers 21 to rotate in opposite directions. This, in conjunction with the conveyor belt 8, lifts the coal powder on the conveyor belt 8, allowing it to fully contact the hot air inside the circulating dryer body 1, thereby improving drying efficiency. A protective cover 25 is rotatably connected to one side of the rotating plate 23. The protective cover 25 is sleeved on the outer surface of the torsion spring 24 and one end is fixedly connected to one side of the inner wall of the circulating dryer body 1. By setting up a protective cover 25, one end of the torsion spring 24 and the rotating plate 23 can be covered, preventing coal dust from getting stuck in the gaps of the torsion spring 24 and affecting its use. A circular roller 26 is rotatably connected to one end of the impeller 21 blades. By setting up the circular roller 26, the contact wear between the impeller 21 blades and the rotating plate 23 can be reduced, making it easier to push the rotating plate 23 and improving the service life of both.

[0036] Figure 4 The anti-clogging device 3 shown includes a second bracket 31, which is fixedly connected to the top side of the feed hopper 4. An electric telescopic rod 32 is fixedly connected to one side of the second bracket 31. One end of the output rod of the electric telescopic rod 32 is located inside the feed hopper 4 and is fixedly connected to a scraper 33. When moist coal powder adheres to the inner wall of the feed hopper 4, the electric telescopic rod 32 on the second bracket 31 can be activated to drive the scraper 33 to move up and down back and forth in the inner wall of the feed hopper 4, scraping off the coal powder adhering to the inner wall, preventing accumulation and blockage of the inner wall of the feed hopper 4, and improving feeding efficiency.

[0037] Figure 4 The scraper 33 shown has triangular ends in its longitudinal section, and its width gradually decreases from the outside to the inside. This gradual reduction in width facilitates the scraper 33's cleaning of the inner wall of the feed hopper 4 without hindering the feeding of pulverized coal. Reinforcing rods 34 are symmetrically fixed to the outer surface of the output rod of the electric telescopic rod 32, with one end of each reinforcing rod fixedly connected to one side of the scraper 33. The reinforcing rods 34 increase the connection area between the scraper 33 and the output rod of the electric telescopic rod 32, making the connection more secure and preventing breakage.

[0038] Working principle: When using the circulating dryer body 1 to dry pulverized coal, the pulverized coal is fed into the interior of the circulating dryer body 1 from the feed hopper 4, falling onto the conveyor belt 8. Then, the heating and drying mechanism inside the circulating dryer body 1 is activated to generate hot air, which then enters the inner wall of the circulating dryer body 1 through the internal air outlet, exchanging heat with the pulverized coal conveyed on the conveyor belt 8 to remove moisture and achieve the drying effect. Several first motors 7 drive the circular shaft 6 and the conveyor belt 8 to rotate alternately to circulate and dry the pulverized coal. When the pulverized coal is conveyed to a certain position on the conveyor belt 8, the second motor 222 is activated to drive the worm gear 223 to rotate on the first support 221, which in turn drives the two worm wheels 224. When the impellers rotate in opposite directions, they cause two adjacent impellers 21 to rotate in opposite directions on two adjacent, intersecting conveyor belts 8. This scrapes and lifts the coal powder that is being conveyed, ensuring that the coal powder adhering to one side of the conveyor belt 8 can also fully contact the hot air, preventing it from sticking to the surface of the conveyor belt 8 and improving the drying effect and efficiency. When the impellers 21 rotate to a certain position, the blades will strike the rotating plate 23, causing the blades to vibrate and preventing the coal powder from sticking to the blades of the impellers 21 during lifting, thus improving the lifting effect. As the blades continue to rotate, they will push the rotating plate 23 to rotate within the inner wall of the circulating drying furnace body 1, causing the torsion spring 24 to deform. Later, when the impellers 21 leave the rotating plate 23, the torsion spring 24 will drive the rotating plate 23 to reset, making it convenient for the next use of the auxiliary impellers 21.

[0039] When moist coal powder adheres to the inner wall of the feed hopper 4, the electric telescopic rod 32 on the second support 31 can be activated to drive the scraper 33 to move up and down in the inner wall of the feed hopper 4, scraping off the coal powder adhering to the inner wall, avoiding accumulation and blockage of the inner wall of the feed hopper 4, and improving feeding efficiency.

[0040] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A circulating fluidized bed dryer for coal fines, comprising a circulating fluidized bed dryer main body (1), a feed hopper (4) and a discharge hopper (5), characterized in that: The inside of the circulating drying furnace body (1) is symmetrically provided with two round shafts (6), the outer surfaces of the two round shafts (6) are sleeved with a conveying belt (8), one side of the circulating drying furnace body (1) is symmetrically provided with a first motor (7), one end of the first motor (7) is fixedly connected with one of the round shafts (6), the feeding hopper (4) is arranged on the top of the circulating drying furnace body (1), the discharging hopper (5) is arranged on the bottom of the circulating drying furnace body (1), the inside of the circulating drying furnace body (1) is provided with an auxiliary device (2), the auxiliary device (2) rotates on the conveying belt (8) through the impeller (21) to scrape the conveyed coal powder to assist in drying, the inner wall of the feeding hopper (4) is provided with an anti-blocking device (3), the anti-blocking device (3) can move up and down on the inner wall of the feeding hopper (4) through the scraper (33) to scrape the adhered coal powder to achieve the anti-blocking effect.

2. A circulating fluidized bed coal drying furnace according to claim 1, characterized in that: The auxiliary device (2) comprises a plurality of impellers (21), the two ends of the impeller (21) penetrate the inner wall of the circulating drying furnace body (1), the inner wall of the circulating drying furnace body (1) is symmetrically and rotatably connected with a rotating plate (23), the outer surface of one end of the rotating plate (23) is sleeved with a torsional spring (24), the two ends of the torsional spring (24) are fixedly installed on the rotating plate (23) and the inner wall of the circulating drying furnace body (1) respectively; The driving mechanism (22) is installed on one side of the circulating drying furnace body (1) to drive the impeller (21) to rotate on the transmission belt.

3. A circulating fluidized bed coal drying furnace according to claim 2, characterized in that: The driving mechanism (22) comprises a first support (221), a second motor (222) and a worm (223), the first support (221) is fixedly arranged on one side of the circulating drying furnace body (1), one end of the worm (223) penetrates the first support (221) and is fixedly connected with the output end of the second motor (222), one end of the impeller (21) is fixedly connected with a worm wheel (224), the worm wheel (224) and the worm (223) are engaged, and the worm teeth on the two ends of the worm (223) are in opposite directions.

4. A circulating fluidized bed coal drying furnace according to claim 2, characterized in that: One side of the rotating plate (23) is rotatably connected with a protective cover (25), the protective cover (25) is sleeved on the outer surface of the torsional spring (24) and is fixedly connected on one side of the inner wall of the circulating drying furnace body (1).

5. A circulating fluidized bed coal drying furnace according to claim 2, characterized in that: One end of the blade of the impeller (21) is rotatably connected with a round roller (26).

6. The circulating fluidized bed coal drying furnace according to claim 1, characterized in that: The anti-blocking device (3) comprises a second support (31), the second support (31) is fixedly connected on one side of the top of the feeding hopper (4), one side of the second support (31) is fixedly connected with an electric telescopic rod (32), and one end of the output rod of the electric telescopic rod (32) is fixedly connected with a scraper (33) in the inside of the feeding hopper (4).

7. A circulating fluidized bed coal drying furnace according to claim 6, characterized in that: The longitudinal section of the two ends of the scraper (33) is triangular, and the width dimension of the scraper (33) gradually decreases from outside to inside.

8. A circulating fluidized bed coal drying furnace according to claim 6, characterized in that: The output rod outer surface of the electric telescopic rod (32) is fixedly connected with a reinforcing rod (34) in a symmetrical manner, one end of the reinforcing rod (34) is fixedly connected with one side of the scraper (33).

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