Coal conveying system of circulating fluidized bed boiler
By employing components such as inverted conical material silos, anti-blocking machines, and gate valves in the coal conveying system of a circulating fluidized bed boiler, the problems of blockage in the coal conveying system and uneven coal distribution were solved, thus achieving stable combustion in the boiler.
Patent Information
- Application Number
- CN202423048860.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-10
AI Technical Summary
When dry coal slime is added to a circulating fluidized bed boiler, the coal conveying system is prone to blockage and uneven coal distribution, leading to unstable boiler combustion.
Design a coal conveying system for a circulating fluidized bed boiler, including a material silo, an anti-blocking machine, a weighing feeder, and a conveyor belt. The material silo consists of a first silo with an inverted conical structure and a second silo with an inverted circular conical structure. An anti-blocking machine and a gate valve are installed. Combined with a controller, a belt frequency converter, and a weighing instrument, the system can achieve material flow control and precise coal blending.
It effectively prevents dry coal slime from sticking to the walls, eliminates material silo blockage, ensures the fluidity of the coal conveying system and the uniformity of coal blending, and guarantees the stability of boiler combustion.
Smart Images
Figure CN223595902U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to coal conveying equipment technical field relates to a circulating fluidized bed boiler coal conveying system. BACKGROUND
[0002] The solid waste produced in the production of calcium carbide has drying flue dust, calcium carbide purification dust, calcium carbide scattered point dust and semi coke dust, and these solid wastes have a certain amount of heat, and at the same time, the circulating fluidized bed boiler can turn the low heat value solid waste into treasure. Therefore, in order to avoid the pollution of solid waste to the environment and increase the economic benefit of enterprises, the solid waste is introduced into the circulating fluidized bed boiler as raw material and mixed with dry coal slime for blending combustion.
[0003] The coal conveying system is a key part of the blending combustion process of dry coal slime in the circulating fluidized bed boiler. In order to reduce the cost of power generation, the amount of dry coal slime needs to be increased, so that the amount of dry coal slime blending is more than 60% of the total amount of mixed blending. However, because of the unstable humidity of coal slime, the different size of coal slime particles, the accumulation of attachments on the inner wall of the coal conveying pipeline and the inappropriate coal conveying wind speed, the coal slime is easy to adhere to the inner wall of the coal bunker, and the coal conveying system is easy to be blocked, which reduces the flowability of the coal conveying process, and further causes the problem of uneven coal blending, resulting in unstable boiler combustion. UTILITARIAN CONTENT
[0004] The utility model provides a circulating fluidized bed boiler coal conveying system, solves the problem of the blockage of the coal conveying system and the uneven coal blending after the increase of dry coal slime, and guarantees the stable combustion of the boiler.
[0005] In order to achieve the above purpose, the utility model adopts the technical scheme of:
[0006] A circulating fluidized bed boiler coal conveying system, comprising a material bin, a anti-blocking machine, a weighing feeder and a conveying belt, the material bin, the weighing feeder and the conveying belt are sequentially communicated from top to bottom, and the anti-blocking machine is arranged on the material bin and located between the material bin and the weighing feeder.
[0007] Further limited, the material bin comprises a first bin body and a second bin body sequentially communicated from top to bottom, the first bin body is a inverted conical structure with a circular bottom, the second bin body is a inverted conical structure, and the anti-blocking machine is arranged on the second bin body.
[0008] Further limited, the inverted conical angle of the first bin body is 35°-45°.
[0009] Further limited, the weighing feeder comprises a belt scale and a belt frequency converter connected with the belt scale, and the second bin body is communicated with the belt scale and the conveying belt.
[0010] Further limited, a weighing instrument is arranged on the belt scale.
[0011] Further limited, the circulating fluidized bed boiler coal conveying system further comprises a plug valve arranged on the second bin body, and the plug valve is located between the anti-blocking machine and the weighing feeder.
[0012] Further limited, the circulating fluidized bed boiler coal conveying system further comprises a controller connected with the anti-blocking machine; and the controller is further connected with the weighing instrument and the belt frequency converter respectively.
[0013] The utility model discloses the beneficial effect is:
[0014] 1. In the utility model, material bin, weighing feeder and conveying belt are sequentially communicated from top to bottom, the anti-blocking machine is arranged on the material bin and is located between the material bin and the weighing feeder. It can effectively prevent the situation of dry coal slime sticking to the wall, and solve the problems of coal system blockage and uneven coal blending.
[0015] 2. In the utility model, the first bin body and the second bin body of the material bin are sequentially communicated from top to bottom, the first bin body is inverted conical structure of upper lower circle, further design the taper angle of the first bin body as 40 DEG, can greatly eliminate the problem of material bin four corners sticking to the wall, improve the fluidity of the coal conveying system.
[0016] 3. In the utility model, the weighing feeder includes a belt scale and a frequency converter connected with the belt scale, the material bin is communicated with the belt scale and the conveying belt, and a weighing instrument is arranged on the belt scale. The output of the belt is controlled by the weighing instrument, so that the material bin can discharge according to the required amount, and the conveying belt can ensure more accurate blending when blending coal slime.
[0017] 4. In the utility model, a plug valve is arranged on the second bin body, and the plug valve is located between the anti-blocking machine and the weighing feeder. At the same time, the lower opening of the plug valve is directly inserted into the coal feeder, which ensures the fluidity of the material in the second bin body and avoids the accumulation of material on the partition plate and the four corners of the first bin body.
[0018] 5. In the utility model, the circulating fluidized bed boiler coal conveying system further comprises a controller connected with the anti-blocking machine, which realizes on-site control through the controller, and the controller is connected with the coal feeder operation and coal cutting signal interlocking, can switch control according to the actual operation of the coal conveying system, and the control is more flexible. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 The utility model provides a coal conveying system schematic diagram;
[0020] Among them:
[0021] 1-material bin; 101-first bin body; 102-second bin body; 2-anti-blocking machine; 3-plug valve; 4-weighing feeder; 5-conveying belt; 6-connection flange; 7-block skin; 8-support frame. Detailed Implementation
[0022] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.
[0023] Example
[0024] See Figure 1 This embodiment provides a circulating fluidized bed boiler coal conveying system, including a material silo 1, an anti-blocking machine 2, a weighing feeder 4, and a conveyor belt 5; the material silo 1, the weighing feeder 4, and the conveyor belt 5 are connected sequentially from top to bottom; the anti-blocking machine 2 is installed on the material silo 1 and located between the material silo 1 and the weighing feeder 4.
[0025] In this embodiment, the material bin 1 includes a first bin body 101 and a second bin body 102 connected from top to bottom. The first bin body 101 is an inverted conical structure with a rounded top and a rounded bottom; the second bin body 102 is an inverted conical structure; and the anti-blocking machine 2 is installed on the second bin body 102.
[0026] In this embodiment, the inverted cone angle of the first compartment 101 is 35° to 45°, and the inverted cone angle of the second compartment 102 is slightly smaller than that of the first compartment 101.
[0027] Preferably, the inverted cone angle of the first compartment 101 is 40°.
[0028] Specifically, both the first compartment 101 and the second compartment 102 have their inverted conical ends facing downwards. The first compartment 101 is located directly above the second compartment 102, and the centerline of the first compartment 101 coincides with the centerline of the second compartment 102. The first compartment 101 is stably connected to the second compartment 102 via a connecting flange 6. Preferably, the connecting flange 6 has a thickness of 20mm and is made of Q235A material.
[0029] Preferably, the material silo 1 is made of 10mm thick stainless steel plate, material Q235A, which is corrosion resistant and has a low coefficient of friction, reducing friction and facilitating the flow of materials (i.e., coal slime and solid waste) in the material silo 1.
[0030] In the embodiment, the weighing feeder 4 comprises a belt scale and a belt frequency converter, the belt frequency converter is located on the belt scale and connected with the belt scale and drives the belt scale to work, and the second bin body 102 is communicated with the belt scale and the conveying belt 5. In use, the belt frequency converter changes the motor speed by changing the output frequency of the frequency converter, so as to realize the automatic control of the running frequency and speed of the belt. The weighing instrument is arranged on the belt scale, the conveying amount of the material (slime and solid waste) of the weighing feeder 4 is controlled by the weighing instrument, the material (slime and solid waste) is ensured to be discharged from the second bin body 102 according to the design requirements of the circulating fluidized bed boiler, and the accuracy of the material (slime and solid waste) conveyed by the conveying belt 5 is ensured.
[0031] Preferably, the two sides of the belt scale on the weighing feeder 4 are respectively provided with a skin blocking plate 7 to prevent the conveyed material on the weighing feeder 4 from spilling.
[0032] Preferably, a support frame 8 is arranged below the conveying belt 5 to support the conveying belt 5 and ensure the stability.
[0033] The circulating fluidized bed boiler coal conveying system provided in the embodiment further comprises a plug valve 3 arranged on the second bin body 102, and the plug valve 3 is located between the anti-blocking machine 2 and the weighing feeder 4.
[0034] Preferably, the anti-blocking machine 2 is a self-flowing rotary anti-blocking machine, and the manufacturer is Nanyang Zhenghua Industry Co., Ltd. The working principle of the self-flowing rotary anti-blocking machine is that the unblocking knife fixed on the middle rotating cylinder is driven to rotate with the middle cylinder body by a power system, and the relative motion is generated with the fixed cylinder bodies located above and below the middle rotating cylinder, so that the unblocking effect is realized; the anti-blocking machine 2 is installed in the easy-to-block section of the lower part of the second bin body 102, that is, above the plug valve 3, specifically, the two fixed cylinder bodies are connected with the outer wall of the second bin body 102, the middle rotating cylinder is connected with the two fixed cylinder bodies, and the unblocking knife is located in the second bin body 102, so that the easy-to-block section is unblocked by the anti-blocking machine 2, and the smooth flow of the material (slime and solid waste) is realized. Under normal circumstances, the anti-blocking machine 2 is in a servo working state, once the coal blocking problem occurs in the second bin body 102, the anti-blocking machine 2 will automatically start according to the coal blocking signal transmitted by the rear weighing feeder 4, when the weight of the material cannot be monitored by the weighing instrument, it indicates that no material is conveyed to the weighing feeder 4, which indicates that the coal blocking occurs, at this time, the weighing instrument will transmit the signal (that is, the coal blocking signal) that the weight of the material cannot be monitored to the controller; the controller controls the anti-blocking machine 2 to automatically start working, and the unblocking is realized within 5s, then when the weight of the material is monitored by the weighing instrument again, it indicates that the coal blocking phenomenon disappears and the material conveying is normal, then the controller controls the anti-blocking machine 2 to automatically stop working according to the monitoring signal of the weighing instrument, and the anti-blocking machine 2 is in the servo state again.
[0035] In implementation, the upper part of the first bin body 101 is connected with the material bin (i.e. the material bin and the solid waste bin), so that the coal slime and the solid waste material enter the material bin 1 to form mixedly burned material; the anti-blocking machine 2 is arranged on the upper part of the second bin body 102, the plug valve 3 is arranged on the lower part of the second bin body 102, and the bottom opening of the second bin body 102, i.e. the discharge port, extends into the weighing feeder 4 to discharge the material in the second bin body 102 to the weighing feeder 4 for weighing and conveying.
[0036] Preferably, the lower opening of the plug valve 3 also extends into the weighing feeder 4, so as to reduce the discharge distance between the plug valve 3 and the weighing feeder 4, so that the material (coal slime and solid waste material) can directly enter the weighing feeder 4, and the coal blocking in the discharge section is prevented.
[0037] In the embodiment, the above arrangement makes the material in the second bin body 102 in a flowing state, so as to change the flowing state of the material (coal slime and solid waste material) in the whole material bin 1, avoid the flowing dead zone in the material bin 1, and solve the blocking problem of the whole material bin 1.
[0038] The circulating fluidized bed boiler coal conveying system provided in the embodiment further comprises a controller connected with the anti-blocking machine 2.
[0039] In implementation, the on-site control cabinet is arranged on site, the controller is arranged in the on-site control cabinet, the controller is used for controlling the working state of the anti-blocking machine 2, when normal, the controller controls the anti-blocking machine 2 to be in a servo working state, when coal blocking occurs, the controller controls the anti-blocking machine 2 to start to clear the coal in the second bin body 102, and when the anti-blocking machine 2 is started for 5 seconds, the controller controls the anti-blocking machine 2 to be in a servo working state; meanwhile, the controller is also connected with the weighing feeder 4, specifically connected with the belt frequency converter and the weighing instrument, so that the controller is connected with the operation and coal blocking signal interlocking of the weighing feeder 4, and the manual and automatic control modes are set.
[0040] Preferably, the controller is a Siemens controller, and the on-site control cabinet is a rectangular structure and is made of 2mm stainless steel.
[0041] In the utility model, the anti-blocking machine 2 is arranged on the lower part of the side wall of the material bin 1, the weighing feeder 4 and the conveying belt 5 are sequentially arranged below the material bin 1, the height combination between the above equipment is realized, the coal conveying system is ensured to be free of coal blocking and uniform coal blending under the condition that the coal slime blending ratio is 60%, and the circulating fluidized bed boiler is stably burned.
[0042] It should be noted that the coal conveying system of the utility model, wherein the coal conveying refers to conveying the coal slime mixed with the solid waste material.
[0043] The above merely illustrates the embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which are made according to the content of the present application specification and drawings, are also included in the patent protection scope of the present application.
Claims
1. A circulating fluidized bed boiler coal conveying system, characterized in that, It includes a material bin (1), an anti-blocking machine (2), a weighing feeder (4), and a conveyor belt (5); the material bin (1), the weighing feeder (4), and the conveyor belt (5) are connected sequentially from top to bottom; the anti-blocking machine (2) is installed on the material bin (1) and located between the material bin (1) and the weighing feeder (4).
2. The circulating fluidized bed boiler coal conveying system according to claim 1, characterized in that, The material silo (1) includes a first silo body (101) and a second silo body (102) connected from top to bottom. The first silo body (101) is an inverted cone structure with a round top and a round bottom. The second silo body (102) is an inverted cone structure. The anti-blocking machine (2) is installed on the second silo body (102).
3. The circulating fluidized bed boiler coal conveying system according to claim 2, characterized in that, The inverted cone angle of the first compartment (101) is 35° to 45°.
4. The circulating fluidized bed boiler coal conveying system according to claim 3, characterized in that, The weighing feeder (4) includes a belt scale and a belt frequency converter connected to the belt scale; the second bin (102) is connected to the belt scale and the conveyor belt (5).
5. The circulating fluidized bed boiler coal conveying system according to claim 4, characterized in that, The belt scale is also equipped with a weighing instrument.
6. The circulating fluidized bed boiler coal conveying system according to any one of claims 2-5, characterized in that, The circulating fluidized bed boiler coal conveying system also includes a slide gate valve (3) installed on the second silo (102), the slide gate valve (3) being located between the anti-blocking machine (2) and the weighing feeder (4).
7. The circulating fluidized bed boiler coal conveying system according to claim 5, characterized in that, The circulating fluidized bed boiler coal conveying system also includes a controller connected to the anti-blocking machine (2), and the controller is also connected to the weighing instrument and the belt frequency converter respectively.