Raw material drying and dedusting ash conveying device for calcium carbide furnace

Abstract

The utility model belongs to the technical field of dust removal in the calcium carbide furnace raw material drying process, and relates to a calcium carbide furnace raw material drying fly ash conveying device which comprises a cyclone dust remover and a bag-type dust remover and further comprises a main scraper conveyer, an auxiliary scraper conveyer, a first branch pipe, a second branch pipe, a third branch pipe, a fourth branch pipe and a three-way valve. The cyclone dust collector is communicated with a first branch pipe or a second branch pipe through a three-way valve, the first branch pipe is communicated with the main scraper conveyor, and the second branch pipe is communicated with the auxiliary scraper conveyor; the bag-type dust collector is communicated with a third branch pipe or a fourth branch pipe through a three-way valve, the third branch pipe is communicated with the main scraper conveyor, and the fourth branch pipe is communicated with the auxiliary scraper conveyor; rapid switching of the main scraper conveyor and the auxiliary scraper conveyor is achieved by switching the three-way valve, the switching procedure of the main scraper conveyor and the auxiliary scraper conveyor is simplified, and the switching time of the main scraper conveyor and the auxiliary scraper conveyor is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of raw material transportation for calcium carbide furnaces, and particularly relates to a conveying device for drying and dedusting ash of raw materials for calcium carbide furnaces. Background Technique

[0002] In the production process of calcium carbide furnaces, the drying of raw materials is the primary link. However, a large amount of dedusting ash will inevitably be generated during this process, seriously polluting the production environment. To address this problem, a dust removal component is introduced to efficiently absorb this dedusting ash and purify the production space. Subsequently, the dedusting ash collected by the dust removal component needs to be transported to a specific treatment area through a conveying system to ensure that the entire production process is both environmentally friendly and efficient.

[0003] In the prior art, there has been some research on the dust transportation device during the drying process of raw materials for calcium carbide furnaces. Refer to the patent document with the application number 201821111969.6, which discloses a limestone feeding device for calcium carbide production raw materials, including: a deacidification tower and a bag filter, and also includes a first scraper conveyor and a spare scraper conveyor arranged horizontally. Total valves are provided at the discharge ports of the deacidification tower and the bag filter, and are connected with a split discharge pipe. A vertical spare branch scraper conveyor is arranged below each split discharge pipe. The split discharge pipe is a pants-shaped structure with two branch pipes below, and branch valves are provided on the branch pipes. The branch pipes on the same side of the deacidification tower and the bag filter extend above the first scraper conveyor, and the branch pipes on the other side of the deacidification tower and the bag filter extend into the head of the lower spare branch scraper conveyor. A downward vertical discharge pipe is provided at the tail of the spare branch scraper conveyor, and the vertical discharge pipe extends above the spare scraper conveyor.

[0004] It can be seen from this that when the first scraper conveyor fails, the dedusting ash passes through the branch scraper conveyor to the spare scraper conveyor, realizing the removal of the dedusting ash during the drying process of the raw materials for the calcium carbide furnace. However, when the first scraper conveyor fails, the dedusting ash can only reach the spare scraper conveyor through the branch scraper conveyor. The switching operation between the first scraper conveyor and the spare scraper conveyor is cumbersome and time-consuming. Content of the Utility Model

[0005] In order to solve the technical problem that the switching operation between the first scraper conveyor and the spare scraper conveyor in the background technique is cumbersome and time-consuming, the utility model provides a conveying device for drying and dedusting ash of raw materials for calcium carbide furnaces.

[0006] For the conveying device for drying and dedusting ash of raw materials for calcium carbide furnaces of the utility model, the quick switching between the first branch pipe and the second branch pipe can be realized by switching the three-way valve, that is, the quick switching between the main scraper conveyor and the auxiliary scraper conveyor is realized, simplifying the switching process between the main scraper conveyor and the auxiliary scraper conveyor and shortening the switching time between the main scraper conveyor and the auxiliary scraper conveyor.

[0007] To solve the above technical problems, the present utility model provides the following technical solutions:

[0008] A conveying device for drying and dedusting ash of calcium carbide furnace raw materials, comprising a cyclone dust collector and a bag filter. The cyclone dust collector and the bag filter capture the dedusting ash during the drying process of calcium carbide furnace raw materials. The conveying device for drying and dedusting ash of calcium carbide furnace raw materials further includes a main scraper conveyor, a secondary scraper conveyor, a first branch pipe, a second branch pipe, a third branch pipe, a fourth branch pipe and a three-way valve. The cyclone dust collector is connected to the first branch pipe or the second branch pipe through the three-way valve. The first branch pipe is connected to the main scraper conveyor, and the second branch pipe is connected to the secondary scraper conveyor. The bag filter is connected to the third branch pipe or the fourth branch pipe through the three-way valve. The third branch pipe is connected to the main scraper conveyor, and the fourth branch pipe is connected to the secondary scraper conveyor.

[0009] In a specific feasible embodiment, the main scraper conveyor includes a conveyor head, a conveyor tail and a conveyor middle part connected between the conveyor head and the conveyor tail. A first feed port is formed on the conveyor middle part. Both the first branch pipe and the third branch pipe are connected to the first feed port. A conveying trough is arranged inside the conveyor middle part, and both ends of the conveying trough extend into the conveyor head and the conveyor tail respectively. A first sprocket is rotatably connected to the conveying trough extending into the conveyor head, and a second sprocket is rotatably connected to the conveying trough extending into the conveyor tail. A scraper chain is sleeved on the outer circumferences of the first sprocket and the second sprocket, and a scraper perpendicular to the plane where the conveying trough is located is connected to the scraper chain. The conveyor tail is connected with a dust discharging hopper for receiving the dedusting ash falling from one end of the conveying trough close to the first sprocket. The conveyor head is connected with a first driving member for driving the first sprocket to rotate. The secondary scraper conveyor has the same structure as the main scraper conveyor.

[0010] In a specific feasible embodiment, the shape of the dust scraping side of the scraper coincides with the shape of the inner surface of the conveying trough.

[0011] In a specific feasible embodiment, the height difference between the secondary scraper conveyor and the main scraper conveyor is not less than 30 cm.

[0012] In a specific feasible embodiment, the conveying device for drying and dedusting ash of calcium carbide furnace raw materials further includes a main elevator. The input end of the main elevator is connected to the outlet of the dust discharging hopper, and the main elevator lifts and discharges the dedusting ash.

[0013] In a specific feasible embodiment, the dust discharging hopper is inclined.

[0014] In a specific feasible embodiment, the inclination angle range of the lower ash hopper is 45° to 60°.

[0015] In a specific feasible embodiment, the conveying device for the dried dust removal ash of the calcium carbide furnace raw materials further includes a secondary elevator; the secondary elevator is arranged side by side with the main elevator, and the input end of the secondary elevator is communicated with the outlet of the lower ash hopper.

[0016] In a specific feasible embodiment, the main elevator includes a head part of the elevator, a tail part of the elevator, and an intermediate part of the elevator connected between the head part of the elevator and the tail part of the elevator; a third sprocket is rotatably connected to the head part of the elevator, a fourth sprocket is rotatably connected to the tail part of the elevator, a lifting chain is sleeved on the outer circumferences of the third sprocket and the fourth sprocket, a hopper is connected to the lifting chain, and the hopper is used for carrying the dust removal ash; a second feeding port is formed in the tail part of the elevator, and the second feeding port is communicated with the lower ash hopper; a discharging port is formed in the head part of the elevator, and a second driving member for driving the third sprocket to rotate is connected to the head part of the elevator; the structure of the secondary elevator is the same as that of the main elevator.

[0017] In summary, the present utility model has the following beneficial technical effects:

[0018] 1. For the conveying device for the dried dust removal ash of the calcium carbide furnace raw materials of the present utility model, by switching the three-way valve, the rapid switching between the first branch pipe and the second branch pipe can be realized, that is, the rapid switching between the main scraper conveyor and the secondary scraper conveyor is realized, simplifying the switching process between the main scraper conveyor and the secondary scraper conveyor and shortening the switching time between the main scraper conveyor and the secondary scraper conveyor.

[0019] 2. For the conveying device for the dried dust removal ash of the calcium carbide furnace raw materials of the present utility model, the provided main elevator facilitates lifting the dust removal ash discharged from the lower ash hopper to the required height, thereby facilitating the operation personnel to transport the dust removal ash and improving the transportation efficiency of the calcium carbide furnace dust removal ash. Preferably, a secondary elevator is also provided, and the secondary elevator and the main elevator are used alternately to ensure the continuity and stability of the transportation of the calcium carbide furnace dust removal ash. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the overall structural schematic diagram of the conveying device for the dried dust removal ash of the calcium carbide furnace raw materials of the present utility model.

[0021] Figure 2 is Figure 1 the enlarged view of part A in

[0022] Figure 3 is Figure 1 the enlarged view of part B in

[0023] Figure 4It is a partial structural schematic diagram of the conveying device for the dust removed from the raw materials dried in the calcium carbide furnace of the present utility model.

[0024] Explanation of reference numerals: 1, cyclone dust collector; 2, bag filter; 3, main scraper conveyor; 31, head of the conveyor; 32, middle part of the conveyor; 321, first feed inlet; 33, scraper chain; 34, scraper; 35, conveying trough; 36, first driving member; 37, ash discharge hopper; 4, main elevator; 41, head of the elevator; 411, discharge opening; 42, tail of the elevator; 421, second feed inlet; 43, middle part of the elevator; 44, lifting chain; 441, hopper; 45, second driving member; 5, auxiliary scraper conveyor; 6, three-way valve; 7, first branch pipe; 8, second branch pipe. Specific embodiments

[0025] The technical solution of the present utility model will be further explained below in conjunction with the drawings and embodiments, but the present utility model is not limited to the embodiments described below.

[0026] Refer to Figure 1 and Figure 4 , a conveying device for the dust removed from the raw materials dried in the calcium carbide furnace, comprising: a cyclone dust collector 1 and a bag filter 2. The cyclone dust collector 1 and the bag filter 2 capture the dust removed during the production process of the calcium carbide furnace. The conveying device for the dust removed from the raw materials dried in the calcium carbide furnace further comprises a main scraper conveyor 3, an auxiliary scraper conveyor 5, a first branch pipe 7, a second branch pipe 8, a third branch pipe, a fourth branch pipe and a three-way valve 6. The main scraper conveyor 3 and the auxiliary scraper conveyor 5 are arranged side by side. The cyclone dust collector 1 is connected to the first branch pipe 7 or the second branch pipe 8 through the three-way valve 6. The first branch pipe 7 is connected to the main scraper conveyor 3, and the second branch pipe 8 is connected to the auxiliary scraper conveyor 5. The bag filter 2 is connected to the third branch pipe or the fourth branch pipe through the three-way valve 6. The third branch pipe is connected to the main scraper conveyor 3, and the fourth branch pipe is connected to the auxiliary scraper conveyor 5.

[0027] Refer to Figure 1 , Figure 2 and Figure 4, the main scraper conveyor 3 includes a conveyor head 31, a conveyor tail, and a conveyor middle part 32 connected between the conveyor head 31 and the conveyor tail. A first feed inlet 321 is provided on the conveyor middle part 32. The first branch pipe 7 and the third branch pipe are both communicated with the first feed inlet 321. And a conveying trough 35 is arranged inside the conveyor middle part 32. The two ends of the conveying trough 35 respectively extend into the conveyor head 31 and the conveyor tail. A first sprocket is rotatably connected to the conveying trough 35 extending into the conveyor head 31. A second sprocket is rotatably connected to the conveying trough 35 extending into the conveyor tail. A scraper chain 33 is sleeved on the outer peripheries of the first sprocket and the second sprocket. And a scraper 34 perpendicular to the plane where the conveying trough 35 is located is connected to the scraper chain 33. The conveyor tail is connected with a lower ash hopper 37. And the lower ash hopper 37 is located directly below one end of the conveying trough 35 close to the first sprocket. The conveyor head 31 is connected with a first driving member 36 for driving the first sprocket to rotate. The first driving member 36 can be a driving device such as a motor. In the present utility model, the main scraper conveyor 3 and the auxiliary scraper conveyor 5 have the same structure and both adopt a FU270 scraper conveyor.

[0028] Specifically, the height difference between the auxiliary scraper conveyor 5 and the main scraper conveyor 3 is not less than 30 cm. The height difference between the auxiliary scraper conveyor 5 and the main scraper conveyor 3 can be 30 cm, can be 35 cm, or can be 40 cm. Setting a suitable height difference between the auxiliary scraper conveyor 5 and the main scraper conveyor 3 can avoid interference when the lower ash hoppers 37 on the auxiliary scraper conveyor 5 and the main scraper conveyor 3 discharge ash, and ensure smooth ash discharge of the lower ash hoppers 37. Such setting methods are all acceptable.

[0029] Refer to Figure 1 and Figure 2 , during the drying process of the raw materials of the calcium carbide furnace, a large amount of dust is generated. First, the cyclone dust collector 1 separates the dust with larger particles by means of cyclone separation, and then the bag dust collector 2 captures the dust with smaller particles by means of bag filtration. The cyclone dust collector 1 and the bag dust collector 2 respectively convey the filtered dust particles to the receiving port of the main scraper conveyor 3 through the first branch pipe 7 and the third branch pipe. The dust falls from the receiving port onto the conveying trough 35. The first driving member 36 drives the first sprocket, the scraper chain 33, the second sprocket, and the scraper 34 to move synchronously. During the movement of the scraper 34, the dust is pushed to one end of the conveying trough 35 close to the lower ash hopper 37. When the dust is pushed to the end of the conveying trough 35, the dust falls into the lower ash hopper 37, realizing the conveying of the dust removed during the drying of the raw materials of the calcium carbide furnace.

[0030] Embodiment 1:

[0031] Refer to Figure 2, in the dust conveying device for drying the raw materials of the calcium carbide furnace in this embodiment, the shape of the dust scraping side of the scraper 34 is consistent with the shape of the inner surface of the conveying trough 35. In this embodiment, the shape of the inner surface of the conveying trough 35 is square, and the scraper 34 is set to a corresponding square shape.

[0032] In this embodiment, the shape of the dust scraping side of the set scraper 34 is consistent with the shape of the inner surface of the conveying trough 35. The contact area between the scraper 34 and the inner surface of the conveying trough 35 is large, which is convenient for more effectively scraping the residual dust on the conveying trough 35 and reducing the risk of blockage caused by the accumulation of dust on the conveying trough 35.

[0033] Embodiment 2:

[0034] Refer to Figure 1 and Figure 4 , in the dust conveying device for drying the raw materials of the calcium carbide furnace in this embodiment, the height difference between the auxiliary scraper conveyor 5 and the main scraper conveyor 3 is 30 cm.

[0035] In this embodiment, the height difference between the auxiliary scraper conveyor 5 and the main scraper conveyor 3 is 30 cm, so that the auxiliary scraper conveyor 5 and the main scraper conveyor 3 will not interfere with each other during the ash discharging process, ensuring smooth ash discharging.

[0036] Embodiment 3:

[0037] Refer to Figure 1 and Figure 3 , in the dust conveying device for drying the raw materials of the calcium carbide furnace in this embodiment, the dust conveying device for drying the raw materials of the calcium carbide furnace further includes a main elevator 4. The input end of the main elevator 4 is communicated with the outlet of the ash discharging hopper 37, and the main elevator 4 lifts and discharges the dust. Specifically, a foundation pit is provided in the extending direction of the ash discharging hopper 37, and the main elevator 4 is located in the foundation pit.

[0038] In this embodiment, the set main elevator 4 is convenient for lifting the dust discharged from the ash discharging hopper 37 to the required height and discharging it smoothly, thereby facilitating the operation personnel to transport the dust and improving the conveying efficiency of the dust of the calcium carbide furnace.

[0039] Embodiment 4:

[0040] Refer to Figure 1 and Figure 2 , in the dust conveying device for drying the raw materials of the calcium carbide furnace in this embodiment, the ash discharging hopper 37 is inclined.

[0041] In this embodiment, the inclined ash discharging hopper 37 utilizes the gravity of the dust to promote the smooth discharge of the dust from the ash discharging hopper 37 to the input end of the main elevator 4, reducing the residence time of the dust in the ash discharging hopper 37, avoiding the occurrence of blockage and dust accumulation phenomena, and improving the conveying efficiency of the dust for drying the raw materials of the calcium carbide furnace.

[0042] Example 5:

[0043] Referring to Figure 2 , for the dust conveying device of the drying raw materials of the calcium carbide furnace in this example, on the basis of Example 4, the inclination angle range of the lower ash hopper 37 is 45° to 60°. Specifically, the inclination angle of the lower ash hopper 37 can be 45°, can be 50°, or can be 60°. Any setting method that can ensure the smooth discharge of the dust removal ash from the lower ash hopper 37 is acceptable.

[0044] In this example, the inclination angle of the lower ash hopper 37 is limited to between 45° and 60°, ensuring the smooth discharge of the dust removal ash from the lower ash hopper 37, avoiding the retention of the dust removal ash in the lower ash hopper 37, and further avoiding the occurrence of blockage and dust accumulation phenomena.

[0045] Example 6:

[0046] Referring to Figure 1 and Figure 2 , for the dust conveying device of the drying raw materials of the calcium carbide furnace in this example, on the basis of Example 3, in this example, the dust conveying device of the drying raw materials of the calcium carbide furnace further includes an auxiliary elevator. The auxiliary elevator is arranged side by side with the main elevator 4, and the input end of the auxiliary elevator is communicated with the outlet of the lower ash hopper 37, and the auxiliary elevator is located in the foundation pit.

[0047] In this example, the provided auxiliary elevator, when the main elevator 4 fails or needs maintenance, the auxiliary elevator continues to work as a standby device to ensure the continuity and stability of the transportation of the dust removal ash of the drying raw materials of the calcium carbide furnace.

[0048] Example 7:

[0049] Referring to Figure 1 and Figure 3 , for the dust conveying device of the drying raw materials of the calcium carbide furnace in this example, on the basis of Example 6, the main elevator 4 includes a hoist head 41, a hoist tail 42, and a hoist middle part 43 connected between the hoist head 41 and the hoist tail 42. A third sprocket is rotatably connected to the hoist head 41, a fourth sprocket is rotatably connected to the hoist tail 42, a hoist chain 44 is sleeved on the outer peripheries of the third sprocket and the fourth sprocket, and a hopper 441 is connected to the hoist chain 44 for carrying the dust removal ash; a second feed inlet 421 is provided at the hoist tail 42, and the second feed inlet 421 is communicated with the lower ash hopper 37; a discharge port 411 is provided at the hoist head 41, and a dust storage tank is placed directly below the discharge port 411. A second driving member 45 for driving the third sprocket to rotate is connected to the hoist head 41, and the second driving member 45 can be a driving device such as a motor; the main elevator 4 and the auxiliary elevator have the same structure, and both the main elevator 4 and the auxiliary elevator are NE30 elevators.

[0050] In this embodiment, the dust removed from the dust hopper 37 enters the hopper 441 through the second feed inlet 421. The second driving member 45 drives the third sprocket, the lifting chain 44, the fourth sprocket and the hopper 441 to move synchronously. During the movement of the hopper 441, the dust removed from the dust is lifted to the top. At this time, the dust removed from the dust in the hopper 441 is discharged from the discharge port 411, and the discharged dust falls into the ash storage tank, finally realizing the transportation of the dust removed from the drying of the raw materials of the calcium carbide furnace.

[0051] The working principle of a device for transporting dust removed from the drying of raw materials of a calcium carbide furnace according to the present invention is as follows: The cyclone dust collector 1 and the bag dust collector 2 respectively transport the filtered dust particles to the conveying trough 35 through the first branch pipe 7 and the third branch pipe. The first driving member 36 drives the first sprocket, the scraper chain 33, the second sprocket and the scraper 34 to move synchronously. During the movement of the scraper 34, the dust removed from the dust is pushed to one end of the conveying trough 35 close to the lower dust hopper 37. When the dust removed from the dust is pushed to the end of the conveying trough 35, the dust removed from the dust falls into the lower dust hopper 37; the dust removed from the dust discharged from the lower dust hopper 37 enters the hopper 441 through the second feed inlet 421. The second driving member 45 drives the third sprocket, the lifting chain 44, the fourth sprocket and the hopper 441 to move synchronously. During the movement of the hopper 441, the dust removed from the dust is lifted to the top. At this time, the dust removed from the dust in the hopper 441 is discharged from the discharge port 411, and the discharged dust falls into the ash storage tank, realizing the transportation of the dust removed from the drying of the raw materials of the calcium carbide furnace.

[0052] The above are all the preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby. Therefore, all equivalent changes made according to the structure, shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A device for conveying dust from drying raw materials for calcium carbide furnace, comprising a cyclone dust collector (1) and a bag dust collector (2), wherein the cyclone dust collector (1) and the bag dust collector (2) capture dust from the drying process of raw materials for calcium carbide furnace, characterized in that: The calcium carbide furnace raw material drying and dust removal conveying device also includes a main scraper conveyor (3), an auxiliary scraper conveyor (5), a first branch pipe (7), a second branch pipe (8), a third branch pipe, a fourth branch pipe and a three-way valve (6); The cyclone dust collector (1) is connected to a first branch pipe (7) or a second branch pipe (8) through a three-way valve (6); the first branch pipe (7) is connected to a main scraper conveyor (3); and the second branch pipe (8) is connected to an auxiliary scraper conveyor (5); The bag filter (2) is connected to the third branch pipe or the fourth branch pipe through a three-way valve (6); the third branch pipe is connected to the main scraper conveyor (3); and the fourth branch pipe is connected to the auxiliary scraper conveyor (5).

2. The device for drying and dust removal of calcium carbide furnace raw materials according to claim 1 is characterized in that: The main scraper conveyor (3) comprises a conveyor head (31), a conveyor tail, and a conveyor middle part (32) connected between the conveyor head (31) and the conveyor tail; The middle part (32) of the conveyor is provided with a first feed port (321), the first branch pipe (7) and the third branch pipe are both connected to the first feed port (321), and a conveying trough (35) is provided in the middle part (32) of the conveyor, and two ends of the conveying trough (35) extend into the head part (31) and the tail part of the conveyor respectively; A first sprocket is rotatably connected to a conveying trough (35) extending into the head portion (31) of the conveyor, and a second sprocket is rotatably connected to a conveying trough (35) extending into the tail portion of the conveyor. A scraper chain (33) is sleeved on the outer periphery of the first sprocket and the second sprocket, and a scraper (34) perpendicular to the plane where the conveying trough (35) is located is connected to the scraper chain (33); The conveyor head (31) is connected to a lower ash hopper (37) for receiving dust ash dropped from the conveying trough (35) near one end of the first sprocket wheel; The conveyor head (31) is connected to a first driving member (36) for driving the first sprocket to rotate; The auxiliary scraper conveyor (5) and the main scraper conveyor (3) have the same structure.

3. The device for drying and dust removal of calcium carbide furnace raw materials according to claim 2 is characterized in that: The shape of the dust scraping side of the scraper (34) matches the shape of the inner surface of the conveying trough (35).

4. The device for drying and dust removal of calcium carbide furnace raw materials according to claim 1 is characterized in that: The height difference between the auxiliary scraper conveyor (5) and the main scraper conveyor (3) is not less than 30 centimeters.

5. The device for conveying raw materials for drying and dust removal of calcium carbide furnace according to claim 2 is characterized in that: The calcium carbide furnace raw material drying and dust removal ash conveying device also includes a main hoist (4); The input end of the main elevator (4) is connected to the outlet of the lower ash hopper (37), and the main elevator (4) lifts and discharges the dust removed.

6. The device for drying and dust removal of calcium carbide furnace raw materials according to claim 5 is characterized in that: The lower ash hopper (37) is arranged tilted.

7. The device for drying and dust removal of calcium carbide furnace raw materials according to claim 6 is characterized in that: The inclination angle of the lower ash hopper (37) ranges from 45° to 60°.

8. The device for conveying raw materials for drying and dust removal of calcium carbide furnace according to claim 5 is characterized in that: The calcium carbide furnace raw material drying and dust removal ash conveying device also includes an auxiliary elevator; The auxiliary elevator is arranged side by side with the main elevator (4), and the input end of the auxiliary elevator is connected to the outlet of the lower ash hopper (37).

9. The device for conveying raw materials for drying and dust removal of calcium carbide furnace according to claim 8, characterized in that: The main hoist (4) comprises a hoist head (41), a hoist tail (42), and a hoist middle part (43) connected between the hoist head (41) and the hoist tail (42); The head portion (41) of the elevator is rotatably connected to a third sprocket, the tail portion (42) of the elevator is rotatably connected to a fourth sprocket, a lifting chain (44) is sleeved on the outer periphery of the third sprocket and the fourth sprocket, a hopper (441) is connected to the lifting chain (44), and the hopper (441) is used to carry dust; The tail portion (42) of the elevator is provided with a second feed port (421), and the second feed port (421) is connected to the lower ash hopper (37); The head portion (41) of the elevator is provided with a discharge port (411), and the head portion (41) of the elevator is connected to a second driving member (45) for driving the third sprocket to rotate; The auxiliary hoist has the same structure as the main hoist (4).

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