Boiler ash conveying device
By using a double-layer bidirectional conveyor design with a chain plate belt and a cooling chamber for temperature reduction, the problem of separating lumpy and powdery materials has been solved, achieving effective material separation and conveying, and improving fuel combustion efficiency and boiler operation stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEFEI DONGFANG THERMAL POWER CO LTD
- Filing Date
- 2025-05-23
- Publication Date
- 2026-06-05
AI Technical Summary
In existing technologies, it is not easy to separate lumpy and powdery materials, and lumpy materials are difficult to transport, which makes screw conveyors prone to jamming. Scraper conveyors have high wear and high power consumption, and are limited in their use for lumpy materials.
It adopts a double-layer bidirectional conveyor design with chain plate belt. The chain plate belt is equipped with ash discharge holes and scrapers for screening lumpy and powdery materials, which are then conveyed separately through the first and second ash discharge pipes. Combined with the cooling chamber for cooling, it realizes the separation and conveying of lumpy and powdery materials.
It enables efficient separation and conveying of lumpy and powdery materials, improves fuel combustion efficiency, and ensures the operational stability of the boiler and the service life of the equipment.
Smart Images
Figure CN224324813U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of conveyor technology, and in particular to a boiler ash conveying device. Background Technology
[0002] For waste incineration power plants, fly ash conveying equipment is mainly divided into two categories: 1. For fly ash from horizontal flues and tail-end flue gas treatment, scraper conveyors are mainly used. 2. For fly ash from the ash hoppers of the second and third flues of the waste incineration boiler, screw conveyors are used.
[0003] In practical applications, the castable refractory material in waste incineration boilers sometimes detaches. Additionally, the high temperatures in the second and third flue gas ducts cause the fly ash to melt and turn into coke lumps. These lumpy castable refractory materials and coke lumps fall into the lower ash hopper, making the screw conveyor prone to jamming and affecting boiler operation. Furthermore, scraper conveyors experience greater wear and tear on their components, consume more power, and have limitations when handling lumpy materials. Utility Model Content
[0004] The purpose of this invention is to solve the shortcomings of existing technologies, such as the difficulty in separating lumpy and powdery materials and the difficulty in conveying lumpy materials, and to propose a boiler ash conveying device.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A boiler ash conveying device includes a frame and an ash inlet hopper mounted on the frame. The device is characterized in that a conveying chamber is provided in the frame, the upper end of the conveying chamber is connected through to the ash outlet of the ash inlet hopper, and a first ash outlet pipe and a second ash outlet pipe are respectively provided on both sides of the conveying chamber.
[0007] A chain plate belt is provided below the ash outlet in the conveying chamber. Multiple conveying rollers are provided in the chain plate belt to drive the chain plate belt to rotate. Ash dropping holes are evenly opened on the chain plate belt. Multiple scrapers are fixedly installed on the outer surface of the chain plate belt. A chain plate tensioning mechanism for adjusting the chain plate belt is provided on one side of the conveying chamber.
[0008] The chain tensioning mechanism includes an adjustment chamber located on one side of the conveying chamber, a trolley located in the adjustment chamber, an adjustment rod for adjusting the position of the trolley, and a telescopic cylinder rotatably connected to the other side of the trolley. The other end of the telescopic cylinder is rotatably connected to a slidable mounting base for mounting the conveyor roller.
[0009] Preferably, the mounting base is provided with sliding grooves on both the front and rear sides, and the inner wall of the conveying chamber is provided with a sliding rail that matches the sliding grooves. The mounting base is provided with elastic limiting rods on both sides for abutting against the mounting base, and the mounting base is provided with a connecting plate that is rotatably connected to the fixed end of the telescopic cylinder.
[0010] Preferably, the inner wall of the adjustment chamber is provided with limiting rails on the upper and lower sides of the trolley, which are slidably connected to the trolley. The trolley is equipped with a bearing seat, and a pull plate is connected between the bearing seat and the adjustment rod.
[0011] Preferably, a corrugated dust cover is fitted onto the telescopic end of the telescopic cylinder.
[0012] Preferably, a plurality of cleaning scrapers are slidably connected to the upper surface of the chain belt located on the lower side, and the cleaning scrapers are horizontally fixedly installed on the inner wall of the conveying chamber.
[0013] Preferably, the first ash discharge pipe is located on one side of the end of the chain conveyor and is used for discharging block materials. The other end of the first ash discharge pipe is connected to the boiler burnout furnace.
[0014] Preferably, the second ash discharge pipe is located on one side of the starting point of the chain conveyor and is used for discharging powdery materials. The other end of the second ash discharge pipe is connected to the slag remover.
[0015] Preferably, a cooling chamber is provided at the lower end of the conveying chamber.
[0016] More preferably, the cooling chamber is provided with air inlets and air outlets on both sides and is respectively connected to an air supply device and an exhaust device.
[0017] Preferably, an expansion baffle is provided at the lower part of the ash hopper, and a sliding baffle is vertically provided in the expansion baffle.
[0018] Compared with the prior art, the beneficial effects of this utility model are:
[0019] In this utility model, the design of double-layer bidirectional conveying of chain plate belt is used to screen and discharge lumpy and powdery materials in ash and slag, which simplifies material separation and improves the combustion efficiency of fuel.
[0020] In this utility model, the design of the ash dropping holes and scrapers on the chain plate belt allows the powdery fly ash on the upper chain plate belt to fall to the bottom of the conveying chamber and be moved by the scrapers, thus ensuring the distribution and conveying effect of fly ash.
[0021] In this invention, the fly ash accumulated on the bottom surface of the conveying chamber is cooled and dissipated through a cooling chamber below the conveying chamber, which facilitates the subsequent processing of the fly ash into the slag remover.
[0022] This utility model features a novel design and compact structure, enabling the separation of lumpy and powdery materials in ash and slag, and allowing for bidirectional separate conveying, thus ensuring excellent slag removal and improving the operational stability of the boiler. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0024] Figure 2 For the appendix Figure 1 Enlarged view of section A in the middle.
[0025] Figure 3 These are top and side views of the chain plate belt of this utility model.
[0026] Figure 4 This is a schematic diagram of the chain plate tensioning mechanism of this utility model.
[0027] Figure 5 This is a schematic diagram of the connection structure between the mounting base and the telescopic cylinder of this utility model.
[0028] In the diagram: 1. Frame; 2. Ash inlet hopper; 21. Ash outlet; 22. Expansion baffle; 221. Sliding baffle; 3. Conveying chamber; 31. Chain belt; 311. Ash drop hole; 312. Scraper; 32. Conveying roller; 33. Ash cleaning scraper; 4. Chain tensioning mechanism; 40. Adjustment chamber; 41. Mounting base; 411. Slide chute; 412. Connecting plate; 42. Slide rail; 43. Telescopic cylinder; 431. Corrugated dust cover; 44. Trolley; 441. Limiting rail; 45. Bearing seat; 46. Pull plate; 47. Adjusting rod; 5. First ash outlet pipe; 6. Second ash outlet pipe; 7. Cooling chamber; 71. Air inlet; 72. Air outlet. Detailed Implementation
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0030] Reference Figure 1-5 A boiler ash conveying device includes a frame 1 and an ash inlet hopper 2 mounted on the frame 1. The frame 1 is characterized by a conveying chamber 3, the upper end of which is connected to the ash outlet 21 of the ash inlet hopper 2. A first ash outlet pipe 5 and a second ash outlet pipe 6 are respectively mounted on both sides of the conveying chamber 3. Block castable refractory, ash blocks, coke blocks, and fly ash from the second and third flues of a waste grate furnace are fed into the conveying chamber 3 through the ash inlet hopper 2, screened, and then discharged through the conveying chamber 3.
[0031] A chain belt 31 is installed below the ash outlet 21 in the conveying chamber 3. Multiple conveyor rollers 32 are installed in the chain belt 31 to drive its rotation. Each conveyor roller 32 is connected to a drive motor to drive its rotation. The drive motor can be located outside the conveying chamber 3 to reduce fly ash intrusion and ensure stable operation. Ash collection holes 311 are evenly distributed on the chain belt 31. Multiple scrapers 312 are fixedly installed on the outer surface of the chain belt 31. A chain tensioning mechanism 4 is provided on one side of the conveying chamber 3 to adjust the tension of the chain belt 31. This mechanism ensures stable rotation of the chain belt 31 while maintaining a suitable distance between the scrapers 312 on the lower chain belt 31 and the inner bottom wall of the conveying chamber 3. This ensures stable scraping of fly ash while avoiding frequent friction with the inner bottom wall of the conveying chamber 3, thus ensuring stable operation of the equipment and extending its service life.
[0032] The chain conveyor belt 31 is a ring conveyor with upper and lower layers. Ash and slag fed in through the ash inlet 2 fall onto the upper layer of the chain conveyor belt 31, while fly ash and other powdery materials fall onto the lower layer of the chain conveyor belt 31 through the ash discharge holes 311, and then onto the inner bottom wall of the conveying chamber 3. As the chain conveyor belt 31 rotates, the scraper 312 on the lower layer of the chain conveyor belt 31 moves close to the inner bottom wall of the conveying chamber 3, scraping away the fly ash that has fallen onto the inner bottom wall and sending it out through the second ash discharge pipe 6. Lumpy castables, ash blocks, coke blocks, etc., that are difficult to fall from the ash discharge holes 311 on the upper layer of the chain conveyor belt 31 are conveyed by the chain conveyor belt 31 and fall into the first ash discharge pipe 5 for discharge.
[0033] The chain tensioning mechanism 4 includes an adjustment chamber 40 located on one side of the conveying chamber 3, a trolley 44 disposed within the adjustment chamber 40, an adjustment rod 47 for adjusting the position of the trolley 44, and a telescopic cylinder 43 rotatably connected to the other side of the trolley 44. The other end of the telescopic cylinder 43 is rotatably connected to a slidable mounting base 41 for mounting the conveyor roller 32. The cooperation between the trolley 44 and the adjustment rod 47 facilitates the adjustment range of the telescopic cylinder 43. Furthermore, the telescopic movement of the telescopic cylinder 43 allows for fine-tuning of the position of the mounting base 41, thereby adjusting the position of the conveyor roller 32 and achieving tensioning or loosening of the chain belt 31.
[0034] Based on the above technical solution, when using this conveying device to transport ash from a waste grate furnace, lumpy castables are conveyed via the upper chain belt 31 and discharged through the first ash outlet pipe 5. Powdered fly ash passes sequentially through the ash outlet holes 311 on the upper and lower chain belts 31 and falls onto the inner bottom wall of the conveying chamber 3. As the chain belt 31 rotates, the fly ash is scraped by the scraper 312 to the second ash outlet pipe 6 for discharge. Through the double-layer bidirectional conveying design, the effect of material distribution and conveying is simply achieved, making it easy to send unburned coke and other materials into the burnout furnace for supplementary combustion, thereby improving the waste incineration efficiency.
[0035] When the tension of the chain belt 31 needs to be adjusted, the position of the conveyor roller 32 can be adjusted by sliding the mounting base 41 through the extension and retraction of the telescopic cylinder 43, thereby achieving tension adjustment of the chain belt 31. When the adjustment range of the chain belt 31 is large, the position of the pulley 44 can be adjusted by adjusting the adjusting rod 47 to adjust the starting position of the extension and retraction end of the telescopic cylinder 43, facilitating fine-tuning of the tension of the chain belt 31 by the telescopic cylinder 43 and ensuring the effectiveness of the tension adjustment of the chain belt 31.
[0036] In this technical solution, such as Figure 1-5 As shown, the mounting base 41 has sliding grooves 411 on both its front and rear sides. The inner wall of the conveying chamber 3 has sliding rails 42 that match the sliding grooves 411. The mounting base 41 has elastic limiting rods 413 on both sides for abutting against it. The mounting base 41 also has a connecting plate 412 that is rotatably connected to the fixed end of the telescopic cylinder 43. The cooperation between the sliding rails 42 and the sliding grooves 411 ensures stable sliding of the mounting base 41 and stable installation. The design of the elastic limiting rods 413 ensures stable movement of the mounting base 41 during fine-tuning, eliminating the need for manual adjustment of bolts and other components. When a larger adjustment is required, the elastic limiting rods 413 can be manually adjusted to ensure a stable abutting effect. The design of the elastic limiting rods 413 also reduces the force on the telescopic cylinder 43, extending its service life.
[0037] In this technical solution, such as Figure 1-5 As shown, the inner wall of the adjustment chamber 40 is provided with limiting rails 441 on the upper and lower sides corresponding to the trolley 44, which are slidably connected to the trolley 44. A bearing seat 45 is installed on the trolley 44, and a pull plate 46 connects the bearing seat 45 and the adjusting rod 47. The limiting rails 441 ensure the stability of the trolley 44 in horizontal movement, as well as the adjustment accuracy during movement, and ensure the tensioning effect on the chain belt 31. The design of the bearing seat 45 avoids vertical tensile stress between the adjusting rod 47 and the trolley 44, ensuring the stability of the structure.
[0038] In this technical solution, such as Figure 1-5 As shown, a corrugated dust cover 431 is fitted onto the telescopic end of the telescopic cylinder 43. This prevents dust from entering the telescopic cylinder 43 and ensures its stable operation. Alternatively, a pressure sensor can be installed at the telescopic cylinder 43 to detect the tension of the chain belt 31. When the tension of the chain belt 31 decreases, it will automatically tighten, ensuring a good tensioning effect on the chain belt 31.
[0039] In this technical solution, such as Figure 1-5As shown, multiple cleaning scrapers 33 are slidably connected to the upper surface of the lower chain belt 31, and the cleaning scrapers 33 are horizontally fixedly installed on the inner wall of the conveying chamber 3. The design of the cleaning scrapers 33 scrapes the fly ash falling on the lower chain belt 31, causing the fly ash to fall through the ash discharge holes 311 on the lower chain belt 31, thus preventing the fly ash from accumulating on the lower chain belt 31 and affecting its stable operation.
[0040] In this technical solution, such as Figure 1 As shown, the first ash discharge pipe 5 is located on one side of the conveyor end of the chain belt 31 for discharging lumpy materials. The other end of the first ash discharge pipe 5 is connected to the boiler burnout furnace. The lumpy materials remaining on the upper chain belt 31 are conveyed by the chain belt 31 and fall naturally when they reach the end of the chain belt 31. They are then discharged through the first ash discharge pipe 5 and fully combusted in the boiler burnout furnace to improve combustion efficiency.
[0041] In this technical solution, such as Figure 1 As shown, the second ash discharge pipe 6 is located on one side of the starting point of the chain belt 31 for discharging powdery materials. The other end of the second ash discharge pipe 6 is connected to the slag remover. The fly ash on the bottom wall of the falling conveyor chamber 3 is scraped by the scraper 312 on the lower chain belt 31 to the area below the starting point of the chain belt 31, and then sent to the slag remover through the second ash discharge pipe 6, thus simply realizing the distribution and conveying of slag.
[0042] In this technical solution, such as Figure 1 As shown, a cooling chamber 7 is provided at the lower end of the conveying chamber 3. Air inlets 71 and outlets 72 are provided on both sides of the cooling chamber 7 and are respectively connected to an air supply device and an exhaust device. The fly ash accumulated on the bottom wall of the conveying chamber 3 contains a significant amount of heat. The airflow in the cooling chamber 7 is ensured through the circulating air supply and exhaust via the air inlets 71 and outlets 72, thus carrying away heat from the conveying chamber 3 and cooling it down.
[0043] In this technical solution, such as Figure 1 and 2 As shown, an expansion baffle 22 is provided at the lower part of the ash inlet hopper 2, and a sliding baffle 221 is vertically arranged in the expansion baffle 22. The expansion baffle 22 and the sliding baffle 221 are preferably made of stainless steel. Because the temperature of the fed slag is high, the folded expansion baffle ensures good sealing of the ash inlet hopper 2 while preventing fly ash leakage due to poor sealing at the joints caused by thermal expansion and contraction, and also provides a certain vibration damping effect. The design of the sliding baffle 221 ensures good ash blocking effect when the expansion baffle 22 extends, ensuring stable fly ash feeding.
[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A boiler ash conveying device, comprising a frame (1) and an ash inlet hopper (2) disposed on the frame (1), characterized in that, The frame (1) is provided with a conveying chamber (3), the upper end of the conveying chamber (3) is connected to the ash outlet (21) of the ash inlet hopper (2), and the first ash outlet pipe (5) and the second ash outlet pipe (6) are respectively provided on both sides of the conveying chamber (3). A chain belt (31) is provided below the ash outlet (21) in the conveying chamber (3). Multiple conveying rollers (32) for driving the chain belt (31) to rotate are provided in the chain belt (31). Ash dropping holes (311) are evenly opened on the chain belt (31). Multiple scrapers (312) are fixedly installed on the outer surface of the chain belt (31). A chain tensioning mechanism (4) for adjusting the chain belt (31) is provided on one side of the conveying chamber (3). The chain tensioning mechanism (4) includes an adjustment chamber (40) on one side of the conveying chamber (3), a trolley (44) in the adjustment chamber (40), an adjustment rod (47) for adjusting the position of the trolley (44), and a telescopic cylinder (43) rotatably connected to the other side of the trolley (44). The other end of the telescopic cylinder (43) is rotatably connected to a sliding mounting seat (41) for mounting the conveyor roller (32).
2. The boiler ash conveying device according to claim 1, characterized in that, The mounting base (41) has a sliding groove (411) on both the front and rear sides. The inner wall of the conveying chamber (3) is provided with a sliding rail (42) that matches the sliding groove (411). The mounting base (41) has elastic limiting rods (413) on both sides for pressing against the mounting base (41). The mounting base (41) is provided with a connecting plate (412) that is rotatably connected to the fixed end of the telescopic cylinder (43).
3. The boiler ash conveying device according to claim 1, characterized in that, The inner wall of the adjustment chamber (40) is provided with limiting rails (441) that are slidably connected to the trolley (44) on the upper and lower sides of the trolley (44). A bearing seat (45) is installed on the trolley (44), and a pull plate (46) is connected between the bearing seat (45) and the adjustment rod (47).
4. A boiler ash conveying device according to claim 1, characterized in that, The telescopic cylinder (43) is fitted with a corrugated dust cover (431) on its telescopic end.
5. A boiler ash conveying device according to claim 1, characterized in that, Multiple cleaning scrapers (33) are slidably connected to the upper surface of the chain belt (31) located on the lower side, and the cleaning scrapers (33) are horizontally fixed on the inner wall of the conveying chamber (3).
6. A boiler ash conveying device according to claim 1, characterized in that, The first ash discharge pipe (5) is located on one side of the conveyor end of the chain plate belt (31) for discharging block materials, and the other end of the first ash discharge pipe (5) is connected to the boiler burnout furnace.
7. A boiler ash conveying device according to claim 1, characterized in that, The second ash discharge pipe (6) is set on one side of the starting point of the chain belt (31) for discharging powdery materials, and the other end of the second ash discharge pipe (6) is connected to the slag remover.
8. A boiler ash conveying device according to claim 1, characterized in that, A cooling chamber (7) is provided at the lower end of the conveying chamber (3).
9. A boiler ash conveying device according to claim 8, characterized in that, The cooling chamber (7) has an air inlet (71) and an air outlet (72) on both sides, which are respectively connected to the air supply device and the exhaust device.
10. A boiler ash conveying device according to claim 1, characterized in that, An expansion baffle (22) is provided at the bottom of the ash hopper (2), and a sliding baffle (221) is vertically provided in the expansion baffle (22).