Biomass fuel circulating fluidized bed boiler slag falling device

Abstract

The utility model relates to a boiler deslagging technical field, and disclose a kind of biomass fuel circulating fluidized bed boiler slag falling device, including deslagging pipe, still including fixedly installed in the deslagging pipe bottom end's dredging sleeve, fixedly installed in the dredging sleeve bottom end's communication pipe and the control valve being set in the side surface of communication pipe, the outer wall of the deslagging pipe is sleeved with outer sleeve, hollow chamber is opened in the inside of the outer sleeve, the inside of the dredging sleeve is provided with the blowback dredging module that carries out internal dredging to ash slag concretion. The biomass fuel circulating fluidized bed boiler slag falling device, by setting hollow chamber of vacuum state in the inside of outer sleeve, form high-efficiency heat preservation structure, effectively slow down the temperature drop speed of ash slag in deslagging pipe, to significantly reduce the risk of blockage caused by ash slag cooling concretion, guarantee the continuity and stability of boiler deslagging, avoid dust escape and star overflow problem caused by artificial slagging, improve the operation safety and environmental friendliness.

Description

Technical Field

[0001] This utility model relates to the field of boiler ash removal technology, specifically to an ash removal device for a biomass fuel circulating fluidized bed boiler. Background Technology

[0002] During the operation of a coal-fired boiler, if the ash removal device is not properly configured, ash and slag in the ash discharge pipe may clump together, making ash removal difficult. If manual ash removal is unavoidable, dust and sparks may leak from the bottom of the boiler. Leaking dust can affect the operating environment, and leaking sparks can burn the ash conveyor belt, posing a significant safety hazard. Therefore, a stable boiler ash removal device is needed to ensure the normal operation of the coal-fired boiler.

[0003] In the design of the air distribution plate and ash discharge pipe of a coal-fired fluidized bed boiler, due to the high ash content in the fuel (generally above 20%), in order to maintain the differential pressure of the feed bed, the high-temperature ash (around 850℃) in the feed bed needs to be continuously discharged through the ash discharge pipe to the ash cooler for cooling before being transported away. However, biomass pellet fuel has extremely low ash content (generally around 7%). In order to maintain the differential pressure of the feed bed, the ash in the feed bed needs to be intermittently discharged through the ash discharge pipe to the ash cooler for cooling. During this intermittent period, the cold air from outside will cool down the ash stored in the ash discharge pipe, forming clumps that block the ash discharge pipe and prevent it from falling freely, causing the aforementioned problems and affecting the safe operation of the power plant. To address this, we propose an ash discharge device for a biomass fuel circulating fluidized bed boiler. Utility Model Content

[0004] The purpose of this invention is to provide a slag removal device for a biomass fuel circulating fluidized bed boiler to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a ash removal device for a biomass fuel circulating fluidized bed boiler, comprising an ash removal pipe, a dredging sleeve fixedly installed at the bottom end of the ash removal pipe, a connecting pipe fixedly installed at the bottom end of the dredging sleeve, and a control valve disposed on the side of the connecting pipe. The outer wall of the ash removal pipe is fitted with an outer sleeve, and the inner part of the outer sleeve has a hollow cavity. An air valve is fixedly installed on the bottom side of the outer sleeve. The hollow cavity is set in a vacuum state. The dredging sleeve is provided with a backflushing dredging module for internal dredging of ash and slag caking.

[0006] Preferably, the upper and lower ends of the outer sleeve are respectively attached to and fixedly connected to the top surface of the slag discharge pipe and the top surface of the unblocking sleeve, and at the same time, the contact parts between the two ends of the outer sleeve and the slag discharge pipe and the unblocking sleeve are provided with sealing structures.

[0007] Preferably, the backflushing unblocking module includes an arc-shaped block, which is slidably installed on the inner wall of the unblocking sleeve. A triangular plate is fixedly installed on the outer wall of the arc-shaped block near the center of the unblocking sleeve. A spring is fixedly connected to the side of the arc-shaped block away from the triangular plate. A contact rod is fixedly installed on the side wall of the arc-shaped block. A contact switch is fixedly installed on the inner wall of the unblocking sleeve. An air pump is fixedly installed on the bottom inner wall of the unblocking sleeve. A rotating ring is rotatably installed on the inner surface of the unblocking sleeve. An annular groove is formed on the outer wall of the rotating ring. A partition is fixedly installed on the inner surface of the annular groove. An air outlet is formed on the inner wall of the rotating ring. A triangular cone is fixedly installed on the inner surface of the rotating ring.

[0008] Preferably, the arc surface of the arc block has the same arc as the internal cavity arc of the unblocking sleeve, and three sets of triangular plates are provided. The three sets of triangular plates are distributed in an arc-shaped linear array on the side of the arc block. The triangular plates are narrower at the end near the slag pipe and wider at the end away from the slag pipe.

[0009] Preferably, the output end of the air pump is located in the tangential direction of the outer wall of the rotating ring.

[0010] Preferably, the number of partitions is provided in multiple sets, and the multiple sets of partitions are arranged in a circumferential array inside the annular groove, and the partitions are arranged in an inclined shape.

[0011] Preferably, the air outlet is configured as an inclined shape, with the end lower near the center of the unblocking sleeve and the end higher away from the center of the unblocking sleeve.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting a vacuum-state hollow cavity inside the outer tube, a highly efficient heat-insulating structure is formed, which effectively slows down the temperature drop rate of ash and slag in the slag discharge pipe, thereby significantly reducing the risk of blockage caused by ash and slag cooling and caking, ensuring the continuity and stability of boiler slag discharge, avoiding dust leakage and spark spillage caused by manual slag discharge, and improving operational safety and environmental friendliness. At the same time, by setting a back-blowing and unblocking module composed of an arc-shaped block, a contact rod, a contact switch, an air pump, a rotating ring, a baffle, an air outlet, and a triangular cone, the air pump can be automatically triggered to start when ash and slag caking and blockage occurs. The rotating airflow is used to blow and break up the caking ash and slag, achieving automatic, efficient, and directional unblocking, effectively preventing ash and slag from accumulating in the slag discharge pipe or connecting pipe, ensuring unobstructed slag discharge channels, and improving the device's adaptability and operational reliability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic cross-sectional view of the outer sleeve of this utility model;

[0015] Figure 3This is a cross-sectional view of the unblocking sleeve of this utility model;

[0016] Figure 4 This is a schematic diagram of the cross-sectional structure of the rotating ring of this utility model.

[0017] The components represented by each number in the attached diagram are listed below: 1. Slag discharge pipe; 2. Connecting pipe; 3. Control valve; 4. Outer sleeve; 5. Hollow cavity; 6. Unblocking sleeve; 7. Arc block; 8. Spring; 9. Triangular plate; 10. Contact rod; 11. Contact switch; 12. Air pump; 13. Rotary ring; 14. Annular groove; 15. Baffle plate; 16. Air outlet; 17. Triangular cone. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-4 The figure shows a slag discharge device for a biomass fuel circulating fluidized bed boiler, including a slag discharge pipe 1, a dredging sleeve 6 fixedly installed at the bottom end of the slag discharge pipe 1, a connecting pipe 2 fixedly installed at the bottom end of the dredging sleeve 6, and a control valve 3 provided on the side of the connecting pipe 2. The outer wall of the slag discharge pipe 1 is fitted with an outer sleeve 4, and a hollow cavity 5 is opened inside the outer sleeve 4. An air valve is fixedly installed on the side of the bottom end of the outer sleeve 4, and the hollow cavity 5 is set in a vacuum state.

[0020] The top of the ash discharge pipe 1 is equipped with a flange for easy connection to the boiler's ash discharge port. Meanwhile, the outer sleeve 4 has a circular cavity at its center that matches the outer diameter of the ash discharge pipe 1. This ensures that the outer sleeve 4 fits snugly against the outside of the ash discharge pipe 1, preventing gaps that could affect its insulation performance. Furthermore, the air valve on the bottom side of the outer sleeve 4 can work with external vacuum equipment to create a near-vacuum in the hollow cavity 5, forming an insulation layer on the outside of the ash discharge pipe 1. This slows down the rapid temperature loss of the ash and slag as they fall, preventing the ash and slag from easily caking and clogging the ash discharge pipe 1.

[0021] The upper and lower ends of the outer sleeve 4 are respectively attached to and fixedly connected to the top surface of the slag discharge pipe 1 and the top surface of the unblocking sleeve 6. At the same time, the contact parts between the two ends of the outer sleeve 4 and the slag discharge pipe 1 and the unblocking sleeve 6 are provided with sealing structures.

[0022] To ensure the sealing of the end between the outer casing 4 and the ash discharge pipe 1, the heat loss in the ash discharge pipe 1 is reduced, thereby reducing the rate of temperature loss of the falling ash in the ash discharge pipe 1 and preventing ash caking, which would affect the continuous, stable and normal operation of the boiler.

[0023] The unblocking sleeve 6 is equipped with a back-flushing unblocking module for internal unblocking of ash and slag caking. The back-flushing unblocking module includes an arc-shaped block 7, which is slidably installed on the inner wall of the unblocking sleeve 6. A triangular plate 9 is fixedly installed on the outer wall of the arc-shaped block 7 near the center of the unblocking sleeve 6. A spring 8 is fixedly connected to the side of the arc-shaped block 7 away from the triangular plate 9. A contact rod 10 is fixedly installed on the side wall of the arc-shaped block 7. A contact switch 11 is fixedly installed on the inner wall of the unblocking sleeve 6. An air pump 12 is fixedly installed on the bottom inner wall of the unblocking sleeve 6. A rotating ring 13 is rotatably installed on the inner surface of the unblocking sleeve 6. An annular groove 14 is opened on the outer wall of the rotating ring 13. A partition 15 is fixedly installed on the inner surface of the annular groove 14. An air outlet 16 is opened on the inner wall of the rotating ring 13. A triangular cone 17 is fixedly installed on the inner surface of the rotating ring 13.

[0024] Please refer to the instruction manual appendix. Figures 3-4 The inner wall of the unblocking sleeve 6 has a contraction cavity whose size is adapted to the arc-shaped block 7. The arc-shaped block 7, spring 8, contact rod 10, and contact switch 11 are all located in the contraction cavity, and the axis of contact rod 10 and contact switch 11 are aligned on the same straight line. Furthermore, in the initial state, the end of the arc-shaped block 7 extends out of the contraction cavity. Under the premise of ensuring that the ash and slag inside the unblocking sleeve 6 fall normally, if ash and slag become caked and blocked in the unblocking sleeve 6 or the bottom connecting pipe 2, the accumulation of ash and slag will squeeze the arc-shaped block 7. The arc-shaped block 7 is slid toward the shrinkage chamber. After the arc-shaped block 7 has slid a certain distance, the contact rod 10 will squeeze the contact switch 11. Specifically, the contact switch 11 is electrically connected to the air pump 12. After the contact switch 11 is opened under pressure, it controls the air pump 12 to start. In addition, a one-way air inlet is provided on the outside of the unblocking sleeve 6. A one-way valve is provided inside the one-way air inlet, so that external air can be provided to the air pump 12 when it starts. At the same time, the one-way valve can also ensure the relative sealing of the cavity inside the unblocking sleeve 6 and reduce the heat loss of ash and slag.

[0025] The arc surface of the arc block 7 has the same arc as the internal cavity arc of the unblocking sleeve 6, and there are three sets of triangular plates 9. The three sets of triangular plates 9 are arranged in an arc-shaped linear array on the side of the arc block 7. The triangular plates 9 are narrow at the end near the slag pipe 1 and wide at the end away from the slag pipe 1.

[0026] The triangular plate 9, which is narrow at the top and wide at the bottom, can cut and impact the falling ash and slag, causing some of the larger pieces of ash and slag to be diverted and broken, reducing the possibility of ash and slag caking inside the unblocking sleeve 6, and also preventing ash and slag from remaining and accumulating on the arc surface of the arc block 7.

[0027] The output end of the air pump 12 is located in the tangential direction of the arc-shaped outer wall of the rotating ring 13.

[0028] When the air pump 12 starts, the airflow generated can work with the baffle 15 to drive the rotating ring 13, causing it to rotate on the inner surface of the unblocking sleeve 6.

[0029] The number of partitions 15 is set in multiple sets, and the multiple sets of partitions 15 are arranged in a circumferential array inside the annular groove 14, and the partitions 15 are arranged in an inclined shape.

[0030] Since the air pump 12 is located in the tangential direction of the rotating ring 13, the airflow blown out by the air pump 12 is also in the tangential direction of the rotating ring 13. Finally, when the airflow acts on the inclined baffle 15, it can drive the rotating ring 13 to rotate, thereby improving the ability of the rotating ring 13 to work with the air outlet 16 and the triangular cone 17 to clear the ash and slag that have hardened inside the unblocking sleeve 6.

[0031] The air outlet 16 is set in an inclined shape, with the end lower near the center of the unblocking sleeve 6 and the end higher away from the center of the unblocking sleeve 6.

[0032] The inclined air outlet 16 prevents the ash and slag moving from top to bottom from moving upward along the inner surface of the air outlet 16, thus preventing the ash and slag from easily entering the cavity inside the unblocking sleeve 6 through the air outlet 16. The airflow blown out from the air outlet 16 can cause the ash and slag to fall, thereby blowing away the ash and slag at the bottom when ash and slag caking occurs, improving the unblocking effect of the device.

[0033] In this invention, during use, the outer sleeve 4 fitted onto the outer wall of the slag discharge pipe 1 has a vacuum-sealed hollow cavity 5 inside, forming an insulation layer. This effectively reduces the caking of ash and slag due to temperature drop during the slag discharge process. When ash and slag enter the unblocking sleeve 6, if blockage occurs, the accumulated ash and slag will push the arc-shaped block 7 to slide inward, compressing the spring 8. This causes the contact rod 10 fixed on the arc-shaped block 7 to trigger the contact switch 11. The contact switch 11 starts the air pump 12, which draws in air from the outside and blows it tangentially towards the annular ring on the outer wall of the rotating ring 13. In the trough 14, under the action of the inclined baffle 15, the airflow drives the rotating ring 13 to rotate. The inner wall of the rotating ring 13 is provided with an inclined air outlet 16 and a triangular cone 17. During the rotation, the airflow ejected from the air outlet 16 blows away the caking ash, while the triangular cone 17 breaks up the ash and promotes its fall. In addition, the triangular plate 9 installed on the arc block 7 plays a role in diverting and pre-crushing when the ash falls normally, further preventing blockage. The entire device realizes the heat preservation and automatic unblocking of ash, ensuring the continuous and safe operation of boiler ash discharge.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A ash removal device for a biomass fuel circulating fluidized bed boiler, comprising an ash removal pipe (1), a dredging sleeve (6) fixedly installed at the bottom end of the ash removal pipe (1), a connecting pipe (2) fixedly installed at the bottom end of the dredging sleeve (6), and a control valve (3) disposed on the side of the connecting pipe (2), characterized in that: The outer wall of the slag discharge pipe (1) is fitted with an outer sleeve (4), and a hollow cavity (5) is opened inside the outer sleeve (4). An air valve is fixedly installed on the bottom side of the outer sleeve (4). The hollow cavity (5) is set in a vacuum state. The dredging sleeve (6) is equipped with a back-blowing dredging module for internal dredging of ash and slag caking.

2. The ash removal device for a biomass fuel circulating fluidized bed boiler according to claim 1, characterized in that: The upper and lower ends of the outer sleeve (4) are respectively attached to and fixedly connected to the top surface of the slag pipe (1) and the top surface of the unblocking sleeve (6). At the same time, the contact parts of the outer sleeve (4) with the slag pipe (1) and the unblocking sleeve (6) are provided with sealing structures.

3. The ash removal device for a biomass fuel circulating fluidized bed boiler according to claim 1, characterized in that: The backflushing unblocking module includes an arc-shaped block (7), which is slidably installed on the inner wall of the unblocking sleeve (6). A triangular plate (9) is fixedly installed on the outer wall of the arc-shaped block (7) near the center of the unblocking sleeve (6). A spring (8) is fixedly connected to the side of the arc-shaped block (7) away from the triangular plate (9). A contact rod (10) is fixedly installed on the side wall of the arc-shaped block (7). A contact switch (11) is fixedly installed on the inner wall of the unblocking sleeve (6). An air pump (12) is fixedly installed on the bottom inner wall of the unblocking sleeve (6). A rotating ring (13) is rotatably installed on the inner surface of the unblocking sleeve (6). An annular groove (14) is opened on the outer wall of the rotating ring (13). A partition (15) is fixedly installed on the inner surface of the annular groove (14). An air outlet (16) is opened on the inner wall of the rotating ring (13). A triangular cone (17) is fixedly installed on the inner surface of the rotating ring (13).

4. The ash removal device for a biomass fuel circulating fluidized bed boiler according to claim 3, characterized in that: The arc surface of the arc block (7) has the same arc as the internal cavity arc of the unblocking sleeve (6), and the number of triangular plates (9) is set in three sets. The three sets of triangular plates (9) are arranged in an arc-shaped linear array on the side of the arc block (7). The triangular plates (9) are narrow at the end near the slag pipe (1) and wide at the end away from the slag pipe (1).

5. The ash removal device for a biomass fuel circulating fluidized bed boiler according to claim 3, characterized in that: The output end of the air pump (12) is located in the tangential direction of the arc-shaped outer wall of the rotating ring (13).

6. The ash removal device for a biomass fuel circulating fluidized bed boiler according to claim 3, characterized in that: The number of partitions (15) is set in multiple sets, and the multiple sets of partitions (15) are arranged in a circumferential array inside the annular groove (14), and the partitions (15) are arranged in an inclined shape.

7. The ash removal device for a biomass fuel circulating fluidized bed boiler according to claim 3, characterized in that: The air outlet (16) is set in an inclined shape with the end lower near the center of the unblocking sleeve (6) and the end higher away from the center of the unblocking sleeve (6).

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