A kind of ash removal equipment for incineration boiler turning flue
By setting up an ash bucket assembly and an ash trap at the bottom of the steering flue of the incineration boiler, and using a vertical ash barrier to block the ash, the problem of poor ash trap rate in the flue ash bucket in the prior art is solved. The effective reduction of the flue gas fly ash rate is achieved.
Patent Information
- Application Number
- CN202210501468.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-05-09
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2042-05-09
AI Technical Summary
The ash trap collection rate of the ash bucket at the bottom of the flue of the existing incineration boilers is poor, which makes it difficult to reduce the fly ash rate in the flue gas.
A devised ash discharge device for the steering flue of incineration boiler is designed, including ash bucket assembly and an ash slag trap at the bottom of the steering flue. The ash slag capture device consists of several vertical ash slags, which are arranged in the ash bucket. The vertical ash slags extend downward from the upper part of the ash slags to block the ash in the flue gas.
It effectively improves the ash trap rate in the flue and reduces the fly ash rate of the flue gas.
Smart Images
Figure CN114811629B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to ash discharging equipment, in particular to ash discharging equipment for a turning flue of an incineration boiler. Background Art
[0002] At present, the mainstream disposal technology for urban domestic waste has changed from landfill to incineration, that is, using incineration boilers for incineration treatment. The mainstream furnace types of current waste incineration boilers are divided into incineration grate furnaces and circulating fluidized bed boilers, but no matter which incineration boiler is used, there is a certain proportion of fly ash in the flue gas after waste incineration. In order to reduce the fly ash rate of the flue gas of the incineration boiler, an ash hopper is usually set at the bottom of the flue of the current incineration boiler to collect and discharge the fly ash in the flue; but the ash hopper at the bottom of the flue of the current incineration boiler has a poor ash capture rate, which is not conducive to reducing the fly ash rate in the flue gas. Summary of the invention
[0003] The object of the present invention is to provide an incineration boiler flue ash removal device which can effectively improve the ash capture rate in the flue of the incineration boiler, thereby reducing the fly ash rate of the flue gas.
[0004] The technical solution of the present invention is:
[0005] A ash removal device for a turning flue of an incineration boiler comprises an ash hopper assembly and an ash capture device arranged at the bottom of the turning flue, the turning flue comprises a vertical front flue and a vertical rear flue, the ash hopper assembly comprises a turning connecting channel, a front ash hopper arranged at the lower end of the vertical front flue, and a rear ash hopper arranged at the lower end of the vertical rear flue, one end of the turning connecting channel is connected to the upper part of the front ash hopper, and the other end of the turning connecting channel is connected to the upper part of the rear ash hopper, the ash capture device comprises a plurality of vertical ash blocking members extending upward and downward, the vertical ash blocking members of the ash capture device are arranged in the front ash hopper or the rear ash hopper, and the vertical ash blocking members extend downward from the upper part of the front ash hopper or the rear ash hopper.
[0006] The vertical front flue, front ash hopper, turning connection channel, rear ash hopper and vertical rear flue in this scheme together form a U-shaped turning flue. The flue gas in the turning flue goes down through the vertical front flue and enters the upper part of the front ash hopper; then, the flue gas goes through the turning connection channel and enters the upper part of the rear ash hopper; then, the flue gas goes up and enters the vertical rear flue. In this process, when the flue gas passes through the upper part of the front ash hopper, the turning connection channel and the upper part of the rear ash hopper, a part of the larger ash in the flue gas will be deposited at the bottom of the front ash hopper and the rear ash hopper under the action of its own weight; more importantly, the ash in the flue gas will be blocked by the vertical ash blocking member of the ash capture device (the ash hits the vertical ash blocking member and falls), causing it to fall to the bottom of the front ash hopper or the rear ash hopper; although a small part of the ash will still pass through the vertical ash blocking member, most of the ash has been blocked; thereby effectively improving the ash capture rate in the flue and reducing the fly ash rate of the flue gas.
[0007] Preferably, the vertical ash blocking member of the ash trapping device is close to the turning connection channel, and the vertical ash blocking member of the ash trapping device is arranged in two rows in front and back along the flue gas flow direction in the turning connection channel. In this way, the ash trapping rate of the ash trapping device can be further improved, thereby reducing the fly ash rate of the flue gas.
[0008] Preferably, it also includes an ash conveying device and an ash weighing device, the ash weighing device includes an ash hopper with an upward opening and a weighing device for weighing the ash hopper, the lower end of the ash hopper is provided with an ash hopper unloading valve, the ash discharged from the front ash hopper and the rear ash hopper is conveyed to the ash hopper through the ash conveying device; the ash capturing device also includes a moving rod and a translation driving mechanism for driving the moving rod to translate, one row of the front and rear rows of vertical ash blocking members of the ash capturing device is fixed in the front ash hopper or the rear ash hopper, and the other row of vertical ash blocking members is fixed on the moving rod, and the translation driving mechanism is used to drive the vertical ash blocking members on the moving rod to move, so that the front and rear rows of vertical ash blocking members are staggered or opposite to each other. The ash hopper unloading valve is opened once every set time t to discharge the ash in the ash hopper downwards. Whenever the ash hopper unloading valve is opened or before it is opened, the weight of the ash hopper is weighed by a weighing device. If the weight of the ash hopper is greater than the set value at this time, the front and rear rows of vertical ash blocking members are staggered through the translation drive mechanism; if the weight of the ash hopper is less than the set value at this time, the front and rear rows of vertical ash blocking members are aligned through the translation drive mechanism.
[0009] Since the fly ash rate in the flue gas generated in different waste incineration processes is different, in order to reduce the fly ash rate of the flue gas as much as possible; the ash hopper unloading valve of this scheme is opened once every set time t to discharge the ash in the ash hopper downward; and every time the ash hopper unloading valve is opened or before it is opened, the weight of the ash hopper is weighed by a weighing device. If the weight of the ash hopper is greater than the set value (indicating that the fly ash rate in the flue gas is high), the front and rear rows of vertical ash blocking members are staggered through the translation drive mechanism, thereby effectively improving the ash capture The vertical ash blocking members of the ash collecting device block the ash in the flue gas, thereby further improving the ash capture rate in the flue and keeping the fly ash rate of the flue gas at a low level; if at this time, the weight of the ash hopper is less than the set value (indicating that the fly ash rate in the flue gas is not high), the front and rear rows of vertical ash blocking members are arranged opposite to each other through the translation drive mechanism, and the ash capture efficiency of the ash collecting device is appropriately reduced to reduce the flow resistance of the ash collecting device to the flue gas, thereby improving the combustion efficiency of the boiler while ensuring that the fly ash rate of the flue gas is kept at a low level.
[0010] Preferably, the lower ends of the front ash hopper and the rear ash hopper are both provided with an ash discharge pipe, and the ash discharge pipes of the front ash hopper and the rear ash hopper are both provided with an ash discharge valve device, the ash conveying device comprises a first ash conveying belt, a front screw conveyor and a rear screw conveyor, the front screw conveyor comprises a first feed port and a first discharge port, the rear screw conveyor comprises a second feed port and a second discharge port, the ash discharge pipe of the front ash hopper is connected to the first feed port, and the first discharge port is located above the first ash conveying belt, the ash discharge pipe of the rear ash hopper is connected to the second feed port, and the second discharge port is located above the first ash conveying belt; the output end of the first ash conveying belt is located above the upper end of the ash hopper. In this way, the ash in the front ash hopper can be transported to the first ash conveying belt through the front screw conveyor, and the ash in the rear ash hopper can be transported to the first ash conveying belt through the rear screw conveyor, so that the ash in the front ash hopper and the rear ash hopper are transported to the first ash conveying belt together, and transported backwards through the first ash conveying belt.
[0011] Preferably, the ash conveying device further comprises a second ash conveying belt, and the ash hopper is located above the second ash conveying belt. Thus, after the ash hopper ash discharge valve is opened, the ash in the ash hopper will be discharged downward to the second ash conveying belt, and then transported backward through the second ash conveying belt.
[0012] Preferably, the front screw conveyor and the rear screw conveyor are both water-cooled screw conveyors. In this way, the ash can be cooled during transportation in the front and rear screw conveyors, thereby preventing the ash delivered to the first ash conveyor belt from being too hot and causing safety hazards.
[0013] Preferably, it also includes an ash conveying device, wherein the lower ends of the front ash hopper and the rear ash hopper are both provided with ash unloading pipes, and the ash unloading pipes of the front ash hopper and the rear ash hopper are both provided with ash unloading valve devices, the ash conveying device includes a first ash conveying belt, a front screw conveyor and a rear screw conveyor, the front screw conveyor includes a first feed port and a first discharge port, the rear screw conveyor includes a second feed port and a second discharge port, the ash unloading pipe of the front ash hopper is connected to the first feed port, and the first discharge port is located above the first ash conveying belt, the ash unloading pipe of the rear ash hopper is connected to the second feed port, and the second discharge port is located above the first ash conveying belt.
[0014] Preferably, the ash unloading valve device is a double-layer ash unloading valve, including upper and lower ash hopper ash unloading valves. When one of the upper and lower ash hopper ash unloading valves in the ash unloading valve device is opened, the other ash hopper ash unloading valve is closed.
[0015] Preferably, the vertical ash blocking member is made of channel steel.
[0016] The beneficial effect of the present invention is that it can effectively improve the ash capture rate in the flue of the incineration boiler, thereby reducing the fly ash rate of the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 The invention discloses a structural schematic diagram of an incineration boiler flue ash removal device.
[0018] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.
[0019] Figure 3 yes Figure 1 A schematic diagram of a cross-sectional structure at BB in the middle.
[0020] Figure 4 The invention discloses a cross-sectional structural diagram of an incineration boiler flue ash removal device.
[0021] In the figure:
[0022] Vertical forward flue 1;
[0023] Vertical rear flue 2;
[0024] Front ash hopper 3;
[0025] Rear ash hopper 4;
[0026] Turn to connecting channel 5;
[0027] Ash capture device 6, vertical ash blocking member 6.1, moving rod 6.2, translation drive mechanism 6.3, horizontal guide sleeve 6.4, front limit block 6.5, rear limit block 6.6;
[0028] Ash discharge valve device 7;
[0029] Ash weighing device 8, ash bucket 8.1, ash bucket unloading valve 8.2, annular supporting plate 8.3, weighing sensor 8.4, annular placing plate 8.5;
[0030] The first ash conveying belt 9;
[0031] The second ash conveying belt 10;
[0032] Front screw conveyor 11;
[0033] Rear screw conveyor 12. DETAILED DESCRIPTION
[0034] Specific embodiment 1: Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, a ash discharge device for a turning flue of an incineration boiler includes an ash hopper assembly and an ash slag capture device arranged at the bottom of the turning flue. The turning flue includes a vertical front flue 1 and a vertical rear flue 2. The vertical front flue and the vertical rear flue are fixed on the frame of the incineration boiler. The ash hopper assembly includes a turning connection channel 5, a front ash hopper 3 arranged at the lower end of the vertical front flue, and a rear ash hopper 4 arranged at the lower end of the vertical rear flue. The upper port of the front ash hopper is sealed and connected to the lower end of the vertical front flue. The lower port of the rear ash hopper is sealed and connected to the lower end of the vertical rear flue. The lower ends of the front ash hopper and the rear ash hopper are both provided with ash discharge pipes, and the ash discharge pipes of the front ash hopper and the rear ash hopper are both provided with ash discharge valve devices 7. One end of the turning connection channel is connected to the upper part of the front ash hopper, and the other end of the turning connection channel is connected to the upper part of the rear ash hopper. The vertical front flue, the front ash hopper, the turning connection channel, the rear ash hopper and the vertical rear flue in this embodiment together constitute a U-shaped turning flue.
[0035] The ash capture device 6 includes a plurality of vertical ash blocking members 6.1 extending upward and downward. The vertical ash blocking members of the ash capture device are arranged in the front ash hopper or the rear ash hopper. In the present embodiment, the vertical ash blocking members of the ash capture device are arranged in the rear ash hopper. The vertical ash blocking members extend downward from the upper part of the rear ash hopper. In the present embodiment, the vertical ash blocking members are formed of channel steels, and the opening of the channel steels faces the steering connection channel or faces away from the steering connection channel. Of course, the vertical ash blocking members can also be formed of steel plates.
[0036] The flue gas in the turning flue of the incineration boiler goes down into the upper part of the front ash hopper through the vertical front flue; then, the flue gas enters the upper part of the rear ash hopper through the turning connecting channel; then, the flue gas goes up into the vertical rear flue. In this process, when the flue gas passes through the upper part of the front ash hopper, the turning connecting channel and the upper part of the rear ash hopper, a part of the larger ash in the flue gas will be deposited at the bottom of the front ash hopper and the rear ash hopper under the action of its own weight; more importantly, the ash in the flue gas will be blocked by the vertical ash blocking parts of the ash capture device (the ash hits the vertical ash blocking parts and falls), causing it to fall to the bottom of the front ash hopper or the rear ash hopper; although a small part of the ash will still pass through the vertical ash blocking parts, most of the ash has been blocked; thereby effectively improving the ash capture rate in the flue and reducing the fly ash rate of the flue gas.
[0037] In this embodiment, Figure 1 , Figure 4 As shown, the ash discharge valve device 7 is a double-layer ash discharge valve, including two upper and lower ash hopper ash discharge valves. When one of the upper and lower ash hopper ash discharge valves in the ash discharge valve device is opened, the other ash hopper ash discharge valve is closed. The ash hopper ash discharge valve is an electric switch valve, such as an electric gate valve. Of course, the ash discharge valve device can also be configured to be composed of one electric switch valve.
[0038] Further, such as Figure 1 , Figure 3 , Figure 4As shown, the vertical ash blocking members 6.1 of the ash capture device 6 are close to the turning connection channel, and the vertical ash blocking members 6.1 of the ash capture device are arranged in two rows in front and back along the flue gas flow direction in the turning connection channel. The vertical ash blocking members in the same row are equidistantly distributed. In this way, the ash capture rate of the ash capture device can be further improved, thereby reducing the fly ash rate of the flue gas.
[0039] Further, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, an ash discharge device for an incineration boiler turning flue also includes an ash conveying device and an ash weighing device 8. The ash weighing device includes an ash hopper 8.1 with an opening facing upward and a weigher for weighing the ash hopper. An ash hopper ash discharge valve 8.2 is provided at the lower end of the ash hopper. The ash hopper ash discharge valve is an electric switch valve, such as an electric gate valve. The ash discharged from the ash discharge pipes of the front ash hopper and the rear ash hopper is transported to the ash hopper through the ash conveying device. The ash capture device 6 also includes a moving rod 6.2 and a translation driving mechanism 6.3 for driving the moving rod to translate. The moving rod is horizontally distributed. The translation direction of the moving rod is parallel to the axial direction of the moving rod. One row of vertical ash blocking members 6.1 of the front and rear rows of vertical ash blocking members 6.1 of the ash capture device is fixed in the rear ash hopper, and the other row of vertical ash blocking members is fixed on the moving rod. Each vertical ash blocking member in the row of vertical ash blocking members fixed on the moving rod is distributed equidistantly in sequence along the axial direction of the moving rod. The translation drive mechanism is used to drive the vertical ash blocks on the moving rod to move so that the front and rear rows of vertical ash blocks are staggered or opposite each other (wherein, the front and rear rows of vertical ash blocks are opposite each other means that the front and rear rows of vertical ash blocks are opposite each other along the direction of flue gas flow in the turning connecting channel).
[0040] The ash hopper discharge valve opens once every set time t to discharge the ash in the ash hopper downwards. Whenever the ash hopper discharge valve opens or 1 second before it opens, the weight of the ash hopper is weighed by a weighing device; if the weight of the ash hopper is greater than the set value at this time, the front and rear rows of vertical ash blocking members are staggered by the translation drive mechanism (such as Figure 3 As shown, Figure 3 The front and rear rows of vertical ash blocking members are staggered in distribution); if at this time, the weight of the ash bucket is less than the set value, the front and rear rows of vertical ash blocking members are arranged opposite to each other through the translation driving mechanism.
[0041] Since the fly ash rate in the flue gas generated during different waste incineration processes is different, in order to reduce the fly ash rate of the flue gas as much as possible; the ash hopper unloading valve of this scheme is opened once every set time t (for example, the set time t is 10 minutes or 20 minutes) to discharge the ash in the ash hopper downward; and every time the ash hopper unloading valve is opened or before it is opened, the weight of the ash hopper is weighed by a weighing device. If the weight of the ash hopper is greater than the set value at this time (indicating that the fly ash rate in the flue gas is high), the front and rear rows of vertical ash blocking members are staggered through the translation drive mechanism, so as to discharge the ash in the ash hopper downward; And effectively increase the blocking area of the vertical ash blocking parts of the ash capture device for the ash flowing through the flue gas, thereby further improving the ash capture rate in the flue, so that the fly ash rate of the flue gas is kept at a low level; if at this time, the weight of the ash hopper is less than the set value (indicating that the fly ash rate in the flue gas is not high), the front and rear rows of vertical ash blocking parts are distributed opposite each other through the translation drive mechanism, and the ash capture efficiency of the ash capture device is appropriately reduced to reduce the flow resistance of the ash capture device to the flue gas, thereby improving the combustion efficiency of the boiler while ensuring that the fly ash rate of the flue gas is kept at a low level.
[0042] In this embodiment, Figure 1 , Figure 2 As shown, an annular support plate 8.3 is fixed on the outer wall of the ash hopper 8.1, and an annular placement plate 8.5 is provided on the frame of the incineration boiler. The ash hopper is supported on the annular placement plate through the annular support plate, and the bottom of the ash hopper passes through the cavity in the annular placement plate and is located below the annular placement plate. The weighing device is located at a weighing sensor 8.4 arranged between the annular support plate and the annular placement plate.
[0043] like Figure 1 , Figure 3 As shown, the ash capture device 6 also includes a mounting seat and a horizontal guide sleeve 6.4 arranged on the mounting seat. The mounting seat is fixed on the frame of the incineration boiler. The horizontal guide sleeve is located on the outside of the rear ash hopper. The moving rod slides along the horizontal guide sleeve, and the upper part of the side wall of the rear ash hopper is provided with a moving rod through hole, and the moving rod passes through the moving rod through hole. The moving rod is provided with a front limit block 6.5 and a rear limit block 6.6, and the horizontal guide sleeve is located between the front limit block and the rear limit block. The translation drive mechanism is a cylinder or an electric cylinder, and the translation drive mechanism is installed on the mounting seat. When the front limit block abuts against the horizontal guide sleeve, the front and rear rows of vertical ash blocking parts are arranged opposite to each other. When the rear limit block abuts against the horizontal guide sleeve, the front and rear rows of vertical ash blocking parts are staggered.
[0044] Further, such as Figure 1 , Figure 3 , Figure 4As shown, the ash conveying device includes a first ash conveying belt 9, a front screw conveyor 11 and a rear screw conveyor 12. The front screw conveyor includes a first feed port and a first discharge port. The rear screw conveyor includes a second feed port and a second discharge port. The ash discharge pipe of the front ash hopper is connected to the first feed port, and the first discharge port is located above the first ash conveying belt. The ash discharge pipe of the rear ash hopper is connected to the second feed port, and the second discharge port is located above the first ash conveying belt. The output end of the first ash conveying belt is located above the upper end of the ash hopper. In this way, the ash in the front ash hopper can be transported to the first ash conveying belt by the front screw conveyor, and the ash in the rear ash hopper can be transported to the first ash conveying belt by the rear screw conveyor, so that the ash in the front ash hopper and the rear ash hopper are transported to the first ash conveying belt together, and transported backwards through the first ash conveying belt.
[0045] The ash conveying device also includes a second ash conveying belt 10. The ash hopper is located above the second ash conveying belt. In this way, after the ash discharge valve of the ash hopper is opened, the ash in the ash hopper will be discharged downward to the second ash conveying belt and transported backward through the second ash conveying belt.
[0046] Furthermore, the front screw conveyor and the rear screw conveyor are both water-cooled screw conveyors. In this way, the ash can be cooled during transportation in the front and rear screw conveyors, thereby preventing the ash delivered to the first ash conveyor belt from being too hot and causing safety hazards.
[0047] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.
Claims
1. An ash removal device for a turning flue of an incineration boiler, wherein the turning flue comprises a vertical front flue and a vertical rear flue, and is characterized in that: include: An ash hopper assembly arranged at the bottom of the diverting flue comprises a diverting connecting channel, a front ash hopper arranged at the lower end of the vertical front flue, and a rear ash hopper arranged at the lower end of the vertical rear flue, one end of the diverting connecting channel is connected to the upper part of the front ash hopper, and the other end of the diverting connecting channel is connected to the upper part of the rear ash hopper; The ash weighing device comprises an ash bucket with an upward opening and a weighing device for weighing the ash bucket. An ash unloading valve is arranged at the lower end of the ash bucket. Ash discharged from the front ash bucket and the rear ash bucket is transported to the ash bucket through the ash conveying device. The ash capture device includes a moving rod, a translation driving mechanism and a plurality of vertical ash blocking members extending up and down. The vertical ash blocking members are arranged in a front ash hopper or a rear ash hopper. The vertical ash blocking members extend downward from the upper part of the front ash hopper or the rear ash hopper. One row of the vertical ash blocking members in the front and rear rows is fixed in the front ash hopper or the rear ash hopper, and the other row of vertical ash blocking members is fixed on the moving rod. The translation driving mechanism drives the vertical ash blocking members on the moving rod to move so that the front and rear rows of vertical ash blocking members are staggered or opposite to each other.
2. The ash removal equipment for the incineration boiler turning flue according to claim 1 is characterized in that: The vertical ash blocking members of the ash capture device are close to the turning connection channel, and the vertical ash blocking members of the ash capture device are arranged in two rows in front and back along the flue gas flow direction in the turning connection channel.
3. The ash removal equipment for the incineration boiler turning flue according to claim 1 is characterized in that: The ash hopper unloading valve is opened once every set time t to discharge the ash in the ash hopper downwards. Whenever the ash hopper unloading valve is opened or before it is opened, the weight of the ash hopper is weighed by a weighing device. If the weight of the ash hopper is greater than the set value at this time, the front and rear rows of vertical ash blocking members are staggered through the translation drive mechanism; if the weight of the ash hopper is less than the set value at this time, the front and rear rows of vertical ash blocking members are aligned through the translation drive mechanism.
4. The ash removal equipment for the incineration boiler turning flue according to claim 1, 2 or 3, characterized in that: The lower ends of the front ash hopper and the rear ash hopper are both provided with ash unloading pipes, and the ash unloading pipes of the front ash hopper and the rear ash hopper are both provided with ash unloading valve devices. The ash conveying device includes a first ash conveying belt, a front screw conveyor and a rear screw conveyor. The front screw conveyor includes a first feed port and a first discharge port, and the rear screw conveyor includes a second feed port and a second discharge port. The ash unloading pipe of the front ash hopper is connected to the first feed port, and the first discharge port is located above the first ash conveying belt. The ash unloading pipe of the rear ash hopper is connected to the second feed port, and the second discharge port is located above the first ash conveying belt; the output end of the first ash conveying belt is located above the upper end of the ash hopper.
5. The ash removal equipment for the incineration boiler turning flue according to claim 4 is characterized in that: The ash conveying device also includes a second ash conveying belt, and the ash hopper is located above the second ash conveying belt.
6. The ash removal equipment for the incineration boiler turning flue according to claim 4 is characterized in that: The front screw conveyor and the rear screw conveyor are both water-cooled screw conveyors.
7. The ash removal equipment for the incineration boiler turning flue according to claim 4 is characterized in that: The ash discharge valve device is a double-layer ash discharge valve, including two upper and lower ash hopper ash discharge valves. When one of the upper and lower ash hopper ash discharge valves in the ash discharge valve device is opened, the other ash hopper ash discharge valve is closed.
8. The ash removal equipment for the incineration boiler turning flue according to claim 1, 2 or 3, characterized in that: The vertical ash blocking member is made of channel steel.
Citation Information
Patent Citations
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