Combined slag removal system of solid waste circulating fluidized bed boiler

Abstract

The utility model discloses a combined slag removal system of a solid waste circulating fluidized bed boiler, and belongs to the technical field of boiler slag removal. The device comprises a bottom ash chain scraper conveyor, a slag conveying belt conveyor and a vibration slag conveyor which are arranged according to a slag conveying sequence, a magnetic iron removal device is arranged above a material receiving port between the slag conveying belt conveyor and the vibration slag conveyor, and the magnetic iron removal device comprises a middle magnet and a circulating adsorption belt which is in circulating transmission around the magnet through a roller; when the circulating adsorption belt circulates to the bottom, the distance between the circulating adsorption belt and the discharging end of the slag conveying belt conveyor is divided into a magnetization section, an adsorption section and a demagnetization iron unloading section from near to far under the action of the magnetic field of the magnet; the magnetic iron removal device removes iron pieces in the bottom slag of the boiler, the removed iron pieces and iron wires avoid damage to downstream equipment, and the service life of a subsequent vibration slag conveyor and a bucket elevator is prolonged. The technical problem that in the prior art, iron pieces in solid waste boiler fuel affect normal operation of a boiler is solved.

Description

Technical Field

[0001] This utility model relates to the field of boiler slag removal technology, and more specifically to a combined slag removal system for a solid waste circulating fluidized bed boiler. Background Technology

[0002] Continuous and normal ash removal from a circulating fluidized bed boiler is a crucial aspect of ensuring stable boiler operation. Boiler fuel is transported to the silo for combustion, and the resulting ash, bottom ash, and particulate matter are discharged through the furnace ash discharge pipe to the ash removal system, then to the ash bin for external transport.

[0003] Existing ash removal systems typically consist of bottom ash chain conveyors, small ash conveyor belts, vibrating ash conveyors, bucket elevators, and ash bins. Due to the large amount of iron and debris in the fuel of solid waste boilers, these iron parts can cause jamming and blockages in equipment such as vibrating ash conveyors and bucket elevators in the ash removal system. Once a blockage occurs, there are safety hazards and time-consuming issues in handling it, which can seriously affect the normal operation of the boiler. Utility Model Content

[0004] 1. Technical problem to be solved by the utility model

[0005] To address the shortcomings of existing technologies where iron parts inside solid waste boiler fuel affect the normal operation of the boiler, this utility model provides a combined ash removal system for solid waste circulating fluidized bed boilers. By installing a magnetic iron removal device above the feed inlet, iron parts in the boiler bottom ash are removed, thereby avoiding damage to downstream equipment.

[0006] 2. Technical Solution

[0007] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0008] A combined ash removal system for a circulating fluidized bed boiler for solid waste includes a bottom ash conveyor, an ash conveying belt conveyor, and a vibrating ash conveyor arranged in the ash conveying sequence. A magnetic iron removal device is installed above the receiving port between the ash conveying belt conveyor and the vibrating ash conveyor. The magnetic iron removal device includes a central magnet and a circulating adsorption belt that is driven by rollers around the magnet. Each roller is installed around the magnet. When the circulating adsorption belt circulates to the bottom, under the action of the magnetic field of the magnet, the distance from the discharge end of the ash conveying belt conveyor is divided into a magnetization section, an adsorption section, and a demagnetization and iron removal section from near to far. The magnetic iron removal device removes iron parts from the bottom ash of the boiler. The removed iron parts and wires prevent damage to downstream equipment and extend the service life of the subsequent vibrating ash conveyor and bucket elevator.

[0009] A further technical solution involves installing a chute pipe near the bottom of the demagnetizing and unloading section, with a conveyor belt installed at the discharge port at the bottom of the chute pipe. The demagnetized iron parts slide through the chute pipe due to their own weight until they fall onto the conveyor belt, which then transports the iron parts outwards.

[0010] A further technical solution involves installing a frame next to the vibrating slag conveyor; the magnetic iron removal device is suspended above the receiving port via a suspension cable connected to the frame; the suspension method facilitates coordination with other equipment, allows for flexible adjustment of height and position, increases space, and allows for selection of the optimal installation point based on the slag conveying equipment, production process, and spatial layout, ensuring close coordination with each piece of equipment and smooth production process.

[0011] A further technical solution involves a magnetic iron removal device that is suspended at an angle, with the left side higher than the right, so that the iron parts that are attracted can fall off due to their own weight at the end of the demagnetizing and unloading section.

[0012] A further technical solution involves setting the slag conveyor belt with a slope that is lower on the left and higher on the right, which facilitates reserving installation space for subsequent equipment.

[0013] A further technical solution involves the suspension cable being secured to the magnetic iron removal device via a telescopic threaded hook connected to the bottom; a guide rail is installed on the upper part of the frame, with rollers rolling on the guide rail. The rollers are connected to the upper part of the suspension cable via a wheel frame, and the length of the telescopic threaded hook can be adjusted as needed to adjust the tilt angle of the magnetic iron removal device.

[0014] 3. Beneficial effects

[0015] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0016] This utility model relates to a combined slag removal system for a solid waste circulating fluidized bed boiler. A magnetic iron removal device is installed at the receiving port. The iron removal device adopts an adjustable hanging installation method to remove iron parts from the bottom ash of the boiler. The iron parts are discharged to the receiving box via an iron conveyor belt. The removed iron parts and wires avoid damage to downstream equipment, effectively solve the problem of iron blockage in the solid waste boiler slag discharge system, and extend the service life of the downstream vibrating slag conveyor and bucket elevator. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the combined slag removal system for a solid waste circulating fluidized bed boiler, as described in a specific embodiment.

[0018] Figure 2 for Figure 1 A schematic diagram of the side view structure;

[0019] Figure 3 for Figure 1 A magnified structural diagram of the magnetic iron removal device in the diagram.

[0020] In the diagram: 1-Bottom ash chain conveyor; 2-Slag conveying belt conveyor; 3-Magnetic iron removal device; 4-Frame; 5-Iron chute; 6-Vibrating slag conveyor; 7-Iron conveying belt conveyor; 11-Slag discharge pipe; 30-Magnet; 31-Circulating adsorption belt; 32-Magnetization section; 33-Adsorption section; 34-Demagnetizing and iron unloading section; 35-Roller; 36-Motor; 41-Suspension cable; 42-Guide rail; 43-Roller; 44-Telescopic threaded hook; 61-Receiving port. Detailed Implementation

[0021] To further understand the content of this utility model, a detailed description of the utility model is provided in conjunction with the accompanying drawings.

[0022] Example 1

[0023] The solid waste circulating fluidized bed boiler combined slag removal system in this embodiment, such as Figure 1 , 2 As shown, the system includes a bottom ash chain conveyor 1, a slag conveyor belt 2, and a vibrating slag conveyor 6 arranged in the slag conveying sequence. A magnetic iron removal device 3 is installed above the receiving port 61 between the slag conveyor belt 2 and the vibrating slag conveyor 6. Figure 1 , 3 As shown, the magnetic iron removal device 3 includes a central magnet 30 and a circulating adsorption belt 31 that is driven by rollers 35 around the magnet 30. The magnet 30 can be an electromagnet or a permanent magnet. Each roller 35 is installed around the magnet 30, with at least four rollers 35. When the circulating adsorption belt 31 circulates to the bottom, under the action of the magnetic field of the magnet 30, the distance from the discharge end of the slag conveyor belt 2 is divided into a magnetization section 32, an adsorption section 33, and a demagnetization and iron unloading section 34 from near to far. The overall shape of the circulating adsorption belt 31 is preferably trapezoidal under the guidance of the four rollers 35, with a longer bottom side to facilitate the adsorption and transfer of iron parts. A chute 5 is set near the bottom of the demagnetization and iron unloading section 34. An iron conveyor belt 7 is installed at the discharge port at the bottom of the chute 5. The demagnetized iron parts slide in the chute 5 due to their own weight until they fall to the iron conveyor belt 7, which then transports the iron parts out.

[0024] In the solid waste circulating fluidized bed boiler combined slag removal system of this embodiment, in specific use: the bottom ash chain conveyor 1 discharges material to the slag conveying belt conveyor 2 through the slag discharge pipe 11 below its discharge port;

[0025] Magnetized adsorption section:

[0026] When the slag conveyor belt 2 carries the slag to the receiving port 61, the ferromagnetic materials in the slag are rapidly magnetized under the influence of the magnetic field, generating magnetic poles opposite to the direction of the magnetic field, thus being subjected to a strong magnetic attraction. Under the influence of this attraction, the ferromagnetic materials overcome their own gravity and friction with other slag materials, moving towards the center of the magnetic field of the magnet 30 and adsorbing onto the belt adsorption section 33 below the circulating adsorption belt 31. The slag after iron removal falls from the receiving port 61 into the vibrating slag conveyor 6.

[0027] Conveying stage:

[0028] Driven by a motor 36, the circulating adsorption belt 31, which adsorbs ferromagnetic impurities, rotates a roller 35 via a transmission belt. The roller 35 then drives the circulating adsorption belt 31 to move counterclockwise, transporting the adsorbed ferromagnetic material from the belt adsorption section 33 to the demagnetizing and unloading section 34. During this process, a magnetic field continuously acts, ensuring that the ferromagnetic material remains adsorbed on the belt of the belt adsorption section 33 and does not fall back into the slag.

[0029] Iron unloading stage:

[0030] When the belt adsorption section 33, which adsorbs ferromagnetic materials, runs to the demagnetization and iron unloading section 34, the magnetic field strength here weakens or disappears, the magnetic force on the ferromagnetic materials decreases or disappears, and under the action of the iron parts' own gravity and the centrifugal force of the circulating adsorption belt 31, they fall off the belt and into the iron chute 5, thus achieving complete separation of ferromagnetic materials from slag.

[0031] The magnetic iron removal device 3 removes ferromagnetic materials, such as iron pieces, from the boiler bottom ash. The removed iron pieces and wires prevent damage to downstream equipment and extend the service life of the subsequent vibrating ash conveyor 6 and bucket elevator.

[0032] Example 2

[0033] The solid waste circulating fluidized bed boiler combined slag removal system of this embodiment has the same basic structure as Embodiment 1, with the following differences or improvements: a frame 4 is installed next to the vibrating slag conveyor 6; the magnetic iron removal device 3 is suspended above the receiving port 61 by suspension cables 41 connected to the frame 4, with the four suspension cables 41 hooking onto four hanging points above the magnetic iron removal device 3; the suspension method does not occupy ground space, and for production workshops or sites with limited space, it can be effectively installed and used without affecting the layout of other equipment and the slag transport channel; moreover, it is easy to cooperate with other equipment, and the height and position can be flexibly adjusted. The optimal installation point can be selected according to the slag conveying equipment, production process and spatial layout, and it can work closely with each piece of equipment to ensure a smooth production process. The magnetic iron removal device 3 is suspended at an angle with the left side higher than the right side, which facilitates the adsorption of iron pieces to fall off due to their own weight at the end of the demagnetizing and unloading section 34. The slag conveyor belt 2 is set with a slope of left bottom and right top, preferably 30°, to facilitate the reservation of installation space for subsequent equipment.

[0034] Example 3

[0035] The solid waste circulating fluidized bed boiler combined slag removal system of this embodiment has the same basic structure as that of embodiment 2, with the following differences or improvements: the suspension cable 41 is hooked to the hanging point of the magnetic iron removal device 3 by a telescopic threaded hook 44 connected to the bottom; a guide rail 42 is installed on the upper part of the frame 4, and a roller 43 is rolled on the guide rail 42. The roller 43 is connected to the upper part of the suspension cable 41 or directly to the telescopic threaded hook 44 through the wheel frame. The length of the telescopic threaded hook 44 can be adjusted as needed to adjust the angle of the magnetic iron removal device 3, so that the iron parts can fall off due to their own weight after demagnetization.

[0036] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention. The actual structure and manufacturing steps are not limited to these. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A combined slag removal system for a solid waste circulating fluidized bed boiler, comprising a bottom ash conveyor (1), a slag conveying belt conveyor (2), and a vibrating slag conveyor (6) arranged in the slag conveying sequence, characterized in that: A magnetic iron removal device (3) is installed above the receiving port (61) between the slag conveyor belt (2) and the vibrating slag conveyor (6). The magnetic iron removal device (3) includes a magnet (30) in the middle and a circulating adsorption belt (31) that is driven by rollers (35) around the magnet (30). When the circulating adsorption belt (31) circulates to the bottom, under the action of the magnetic field of the magnet (30), the distance from the discharge end of the slag conveyor belt (2) is divided into a magnetization section (32), an adsorption section (33), and a demagnetization and iron removal section (34) from near to far.

2. The solid waste circulating fluidized bed boiler combined slag removal system according to claim 1, characterized in that: A chute (5) is installed near the bottom of the demagnetizing and unloading section (34), and a conveyor belt (7) is installed at the bottom outlet of the chute (5).

3. The solid waste circulating fluidized bed boiler combined slag removal system according to claim 2, characterized in that: The vibratory slag conveyor (6) is mounted on a frame (4) on the side; the magnetic iron removal device (3) is suspended above the receiving port (61) by a suspension cable (41) connected to the frame (4).

4. The solid waste circulating fluidized bed boiler combined slag removal system according to claim 2, characterized in that: The magnetic iron removal device (3) is suspended at an angle with the left side higher than the right side.

5. The solid waste circulating fluidized bed boiler combined slag removal system according to claim 2, characterized in that: The slag conveyor belt (2) is set with a slope that is lower on the left and higher on the right.

6. The solid waste circulating fluidized bed boiler combined slag removal system according to claim 3, characterized in that: The suspension cable (41) is hooked to the magnetic iron removal device (3) by a telescopic threaded hook (44) connected to the bottom; a guide rail (42) is installed on the upper part of the frame (4), and a roller (43) is rolled on the guide rail (42). The roller (43) is connected to the upper part of the suspension cable (41) through a wheel frame.

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