CN112361364A - Device for removing coarse particle ash by using ash bucket of economizer - Google Patents
Device for removing coarse particle ash by using ash bucket of economizer Download PDFInfo
- Publication number
- CN112361364A CN112361364A CN202011270473.5A CN202011270473A CN112361364A CN 112361364 A CN112361364 A CN 112361364A CN 202011270473 A CN202011270473 A CN 202011270473A CN 112361364 A CN112361364 A CN 112361364A
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- China
- Prior art keywords
- ash
- economizer
- hopper
- coal economizer
- outlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000011362 coarse particle Substances 0.000 title claims abstract description 17
- 239000002956 ash Substances 0.000 claims abstract description 179
- 239000003245 coal Substances 0.000 claims abstract description 61
- 239000010881 fly ash Substances 0.000 claims abstract description 53
- 239000000428 dust Substances 0.000 claims description 13
- 239000002245 particle Substances 0.000 abstract description 12
- 239000003054 catalyst Substances 0.000 abstract description 7
- 238000005299 abrasion Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 11
- 239000003546 flue gas Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000011044 inertial separation Methods 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
- F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/01—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using means for separating solid materials from heat-exchange fluids, e.g. filters
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Gasification And Melting Of Waste (AREA)
Abstract
A device for removing coarse particle ash by using an economizer ash hopper comprises an economizer outlet flue, an economizer outlet fly ash collecting device, an air preheater inlet flue, an air preheater outlet flue and a first ash dropping pipe; the device comprises a coal economizer, an economizer outlet fly ash collecting device, a coal economizer ash hopper, a coal economizer ash conveying device and a coal economizer ash collecting device, wherein the coal economizer outlet fly ash collecting device is arranged below a coal economizer outlet flue; the inlet flue of the air preheater is connected with the air preheater, and the air preheater is connected with the outlet flue of the air preheater; the ash conveying device of the ash hopper of the coal economizer is connected with the outlet flue of the air preheater through a first ash dropping pipe. The device can pre-remove the proportion of particles with the particle size of more than 200 mu m exceeding 40-80 percent, obviously reduce the abrasion of subsequent equipment and catalyst, and is an economical and feasible device with obvious effect for reducing the abrasion of the equipment such as the catalyst and the like.
Description
Technical Field
The invention relates to an ash removal device system, in particular to a device for removing coarse particle ash by using an ash bucket of an economizer.
Background
Due to the coal quality and the combustion system, more coal-fired boilers appear on the spot with coarse dust particles. Ash particles having a particle size of more than 200 μm are present in a large proportion, and particles having a particle size of up to 1000-2000 μm are also present. These particles will cause more severe attrition of the subsequent flue and catalyst. Conventional economizer flue and ash hopper designs can only collect about 5% of the total ash, and the vast majority of the ash will still enter the subsequent flues and equipment.
Disclosure of Invention
To overcome the problems in the prior art, the invention aims to provide a device for removing coarse particle ash by using an ash bucket of an economizer.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a device for removing coarse particle ash by using an economizer ash hopper comprises an economizer outlet flue, an economizer outlet fly ash collecting device, an air preheater outlet flue and a first ash dropping pipe;
the device comprises a coal economizer, an economizer outlet fly ash collecting device, a coal economizer ash hopper, a coal economizer ash conveying device and a coal economizer ash collecting device, wherein the coal economizer outlet fly ash collecting device is arranged below a coal economizer outlet flue; the inlet flue of the air preheater is connected with the air preheater, and the air preheater is connected with the outlet flue of the air preheater; the ash conveying device of the ash hopper of the coal economizer is connected with the outlet flue of the air preheater through a first ash dropping pipe.
The invention is further improved in that an ash bucket fly ash baffle is arranged in the ash bucket of the coal economizer.
The invention is further improved in that the ash bucket fly ash baffles are arranged vertically and are several.
The invention is further improved in that the height of the ash bucket fly ash baffle is-mm.
The invention is further improved in that the horizontal distance between adjacent ash bucket fly ash baffles is-mm.
The invention is further improved in that the radian formed by the connection lines of the upper surfaces of the fly ash baffles of the ash hoppers ranges from degrees to degrees.
The invention is further improved in that the inlet flue of the air preheater is positioned below the ash conveying device of the ash hopper of the coal economizer.
The invention is further improved in that the fly ash trapping device at the outlet of the economizer comprises a baffle plate arranged in a flue at the outlet of the economizer, an ash collecting hopper is arranged below the baffle plate, a second ash dropping pipe is arranged below the ash collecting hopper, and the ash hopper of the economizer is arranged below the second ash dropping pipe.
Compared with the prior art, the invention has the following beneficial effects: the invention provides a device for removing coarse particle ash from an ash bucket of an economizer, which is characterized in that a fly ash collecting device at an outlet of the economizer and a fly ash baffle of the ash bucket are arranged, collected fly ash falls into the ash bucket of the economizer, an opening is formed in the ash bucket of the economizer, and the fly ash falls into a flue at the outlet of an air preheater through a second ash dropping pipe, so that the proportion of particles with the particle size of more than 200 mu m exceeding 40-80 percent can be removed in advance, the abrasion of subsequent equipment and a catalyst is obviously reduced, and the device is economical and feasible and has an obvious effect of reducing the abrasion of equipment such as the catalyst.
Further, the space of the ash hopper of the coal economizer is utilized, the fly ash baffle of the ash hopper is installed to the inlet inside the ash hopper of the coal economizer according to the height, the distance and the radian which are optimal in the CFD simulation result, and the optimal result is verified through the actual transformation project.
Further, as the fly ash collecting device and the fly ash baffle of the ash bucket are arranged at the outlet of the coal economizer, the ash collecting capacity of the ash bucket of the coal economizer is greatly improved, an original pneumatic ash conveying system cannot convey collected ash away in time, and a long-distance first ash falling pipe is designed, is connected to the opening through the side opening of the ash bucket of the coal economizer and ensures that the ash falling is smooth by determining that the actual ash falling angle is greater than 50 degrees. Therefore, the integral ash conveying capacity of the ash bucket of the coal economizer is improved, and the ash collecting capacity of the fly ash collecting device at the outlet of the coal economizer and the fly ash baffle of the ash bucket is reflected to the maximum extent.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the system of the present invention.
FIG. 2 is a schematic structural diagram of a fly ash collecting device at the outlet of an economizer.
In the figure, 1, an economizer outlet flue; 2. a fly ash trapping device at the outlet of the economizer; 3. an ash bucket fly ash baffle; 4. an economizer hopper; 5. an ash conveying device of an ash hopper of the coal economizer; 6. an air preheater inlet flue; 7. an air preheater; 8. an air preheater outlet flue; 9. a first ash falling pipe; 10. a baffle plate; 11. a dust collecting hopper; 12. a second ash falling pipe.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1 and 2, the invention comprises an economizer outlet flue 1, an economizer outlet fly ash collecting device 2, an ash bucket fly ash baffle 3, an air preheater inlet flue 6, an air preheater 7, an air preheater outlet flue 8 and a first ash dropping pipe 9.
The device comprises an economizer outlet fly ash collecting device 2, an economizer ash hopper 4, an ash hopper fly ash baffle 3, an economizer ash hopper 5 and an economizer ash hopper ash conveying device, wherein the economizer outlet fly ash collecting device 2 is arranged below an economizer outlet flue 1, the economizer ash hopper 4 is internally provided with the ash hopper fly ash baffle 3, the bottom of the economizer ash hopper 4 is provided with an opening, and the opening is provided with the economizer ash hopper ash conveying device 5. The air preheater inlet flue 6 is positioned below the economizer ash hopper ash conveying device 5.
The inlet flue 6 of the air preheater is connected with the air preheater 7, and the air preheater 7 is connected with the outlet flue 8 of the air preheater. The ash conveying device 5 of the ash hopper of the coal economizer is connected with the outlet flue 8 of the air preheater through a first ash dropping pipe 9.
Referring to fig. 2, the economizer outlet fly ash collecting device 2 comprises a baffle plate 10 arranged in the economizer outlet flue 1, an ash collecting hopper 11 is arranged below the baffle plate 10, a second ash dropping pipe 12 is arranged below the ash collecting hopper 11, and the economizer ash hopper 4 is arranged below the second ash dropping pipe 12.
After high-temperature flue gas at the outlet of the economizer enters a flue space at the rear wall (far away from the boiler side) of a flue at the outlet of the economizer, the flue gas and dust change the original vertically downward flowing track when passing through the baffle plate 10, the dust is gradually enriched on the surface close to the baffle plate 10 due to the different densities of the dust and the flue gas, and when continuously flowing downwards, the dust has larger particles, especially coarse particles, to be thrown into the ash collecting hopper 11 due to the action of inertia force, and the flue gas turns and enters a horizontal flue at the outlet of the economizer along a flue channel. After entering the dust collecting hopper 11, the dust enters the second dust falling pipe 12 due to the action of gravity, enters the ash hopper of the coal economizer, and is conveyed to the ash silo by using the original ash conveying system of the coal economizer. The device only shows a typical fly ash trapping device structure at the outlet of the economizer, and the proposed device utilizes the low flow speed of the flue of the economizer, the vertical turning of the flue gas to the horizontal, and the favorable spaces and conditions of an economizer ash hopper, an ash conveying system and the like, and the generated flue gas resistance can be generally less than 100 Pa. The types and the sizes of the baffle plate 10 and the dust collecting hopper 11 need to be specifically designed according to the flow rate and the space of the flue gas, so that the best effect is achieved.
The flue at the outlet of the economizer on the front wall (the side close to the boiler) is removed by a large inclined plane and an economizer ash hopper 4. Specifically, the inside of economizer ash bucket 4 is provided with the ash bucket flying dust baffle 3 of a plurality of vertical settings, and the style of ash bucket flying dust baffle 3 is: the height is 200-300 mm, the length runs through the whole coal economizer ash hopper 4, the horizontal distance between the adjacent ash hopper fly ash baffles 3 and the ash hopper fly ash baffles 3 is 200-300 mm, and the radian formed by the upper surface connecting lines of the ash hopper fly ash baffles 3 is 10-30 degrees.
By utilizing the space of the economizer ash hopper 4, the ash hopper fly ash baffle 3 is installed to the inlet inside the economizer ash hopper 4 according to the height, the distance and the radian which are optimal in the CFD simulation result and the optimal result is verified through the actual transformation project.
The fly ash collecting device 2 and the ash bucket fly ash baffle 3 are arranged at the outlet of the coal economizer, so that the ash collecting capacity of the ash bucket 4 of the coal economizer is greatly improved, the collected ash cannot be conveyed away in time by an original pneumatic ash conveying system, and the first ash falling pipe 9 with a long distance is designed, and the smooth ash falling is ensured by opening the side surface of the ash bucket 4 of the coal economizer, connecting the first ash falling pipe 9 to the opening and determining that the actual ash falling angle is more than 50 degrees; and simultaneously, the gas locking device is adopted, so that the short circuit of the smoke gas is avoided. Thereby improving the whole ash conveying capacity of the ash hopper 4 of the coal economizer and reflecting the ash collecting capacity of the fly ash collecting device 2 at the outlet of the coal economizer and the fly ash baffle 3 of the ash hopper in the largest range.
CFD research shows that the ash sample obtained in field practice can be tested by using the ash bucket removing device of the coal economizer, the removing rate of ash with the particle size of more than 200 mu m is 40-80%, and the abrasion of a subsequent flue and a catalyst can be obviously reduced. The coal economizer outlet flue is characterized in that the cross section of the flue is large, the flow velocity of flue gas is as low as 3-5m/s, the total resistance generated by additionally arranging the coal economizer outlet fly ash collecting device 2 and the fly ash baffle 3 on the ash bucket at the outlet of the coal economizer is less than 100pa, and the actual operation is not influenced; the flowing direction of the flue gas is changed on the front wall and the rear wall, and the fly ash is separated into the ash hopper by using the inertia force, so that the ash removal efficiency is improved. Meanwhile, the original ash hopper and the ash conveying system can be used, and the first ash dropping pipe 9 with a long distance is added to ensure smooth ash conveying.
The structure and principle of the invention are as follows:
the invention only shows a typical device for removing coarse particle ash from an ash bucket of an economizer, the generated flue gas resistance is about 100pa by utilizing the low flow rate of a flue of the economizer, the vertical turning of the flue gas to the horizontal, favorable spaces and conditions of the ash bucket of the economizer, an ash conveying system and the like, and the method for pre-removing most coarse particle ash by utilizing the principle of inertial separation is also in a protection range.
The ash removing device system is generally arranged in an ash hopper of the coal economizer, and can remove most of coarse particle ash by utilizing the original ash hopper of the coal economizer and an ash conveying system so as to reduce the abrasion of subsequent equipment such as a catalyst and the like.
Claims (8)
1. A device for removing coarse particle ash by using an economizer ash hopper is characterized by comprising an economizer outlet flue (1), an economizer outlet fly ash collecting device (2), an air preheater outlet flue (8) and a first ash dropping pipe (9);
the device comprises a coal economizer outlet fly ash collecting device (2), a coal economizer ash hopper (4), a coal economizer ash conveying device (5) and a coal economizer ash collecting device, wherein the coal economizer outlet fly ash collecting device (2) is arranged below a coal economizer outlet flue (1), the coal economizer ash hopper (4) is arranged below the coal economizer outlet fly ash collecting device (2), the bottom of the coal economizer ash hopper (4) is provided with a hole, and the hole is provided with the coal economizer ash hopper conveying device (5); an ash conveying device (5) of an ash hopper of the coal economizer is connected with an outlet flue (8) of the air preheater through a first ash dropping pipe (9).
2. The device for removing coarse particle ash by using the ash bucket of the coal economizer as claimed in claim 1, wherein an ash bucket fly ash baffle (3) is arranged in the ash bucket (4) of the coal economizer.
3. The device for removing coarse particle ash by using the ash hopper of the coal economizer as claimed in claim 2, wherein the ash hopper fly ash baffles (3) are arranged in a plurality and vertically.
4. The device for removing coarse particle ash by using the ash bucket of the coal economizer as claimed in claim 3, wherein the height of the fly ash baffle plate (3) of the ash bucket is (200) to (300) mm.
5. The device for removing coarse dust from an ash bucket of an economizer according to claim 3, wherein the horizontal distance between the fly ash baffles (3) of adjacent ash buckets is (200) to (300) mm.
6. The device for removing coarse dust from an ash hopper of an economizer according to claim 3, wherein the radian formed by the connection of the upper surfaces of the plurality of ash hopper fly ash baffles (3) is within the range of (10) ° to (30) °.
7. The device for removing coarse particle ash by using the ash hopper of the coal economizer as claimed in claim 1, wherein the air preheater inlet flue (6) is positioned below the ash conveying device (5) of the ash hopper of the coal economizer.
8. The device for removing coarse particle ash by using the ash hopper of the coal economizer as claimed in claim 1, wherein the fly ash collecting device (2) at the outlet of the coal economizer comprises a baffle plate (10) arranged in the flue (1) at the outlet of the coal economizer, an ash collecting hopper (11) is arranged below the baffle plate (10), a second ash dropping pipe (12) is arranged below the ash collecting hopper (11), and the ash hopper (4) of the coal economizer is arranged below the second ash dropping pipe (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011270473.5A CN112361364A (en) | 2020-11-13 | 2020-11-13 | Device for removing coarse particle ash by using ash bucket of economizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011270473.5A CN112361364A (en) | 2020-11-13 | 2020-11-13 | Device for removing coarse particle ash by using ash bucket of economizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112361364A true CN112361364A (en) | 2021-02-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011270473.5A Pending CN112361364A (en) | 2020-11-13 | 2020-11-13 | Device for removing coarse particle ash by using ash bucket of economizer |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01129548U (en) * | 1988-02-26 | 1989-09-04 | ||
| WO2003090899A1 (en) * | 2002-04-26 | 2003-11-06 | Norsk Hydro Asa | A method and an equipment for separating solids from a gas flow and the use of the same |
| CN101050861A (en) * | 2007-03-13 | 2007-10-10 | 西安热工研究院有限公司 | Flyash impact collector and its use in powder coal boiler |
| JP2020067205A (en) * | 2018-10-23 | 2020-04-30 | 三菱日立パワーシステムズ株式会社 | Boiler, ash processing device, method of operating boiler, and method of operating ash processing device |
| CN111140867A (en) * | 2020-01-17 | 2020-05-12 | 江苏中科重工股份有限公司 | Coal economizer outlet ash bucket |
| CN211041010U (en) * | 2019-10-16 | 2020-07-17 | 福能(贵州)发电有限公司 | Device for transferring fly ash in ash hopper of economizer |
| CN111841155A (en) * | 2020-08-11 | 2020-10-30 | 西安西热锅炉环保工程有限公司 | Device and method for pre-removing coarse particle ash in front of SCR (Selective catalytic reduction) denitration device |
-
2020
- 2020-11-13 CN CN202011270473.5A patent/CN112361364A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01129548U (en) * | 1988-02-26 | 1989-09-04 | ||
| WO2003090899A1 (en) * | 2002-04-26 | 2003-11-06 | Norsk Hydro Asa | A method and an equipment for separating solids from a gas flow and the use of the same |
| CN101050861A (en) * | 2007-03-13 | 2007-10-10 | 西安热工研究院有限公司 | Flyash impact collector and its use in powder coal boiler |
| JP2020067205A (en) * | 2018-10-23 | 2020-04-30 | 三菱日立パワーシステムズ株式会社 | Boiler, ash processing device, method of operating boiler, and method of operating ash processing device |
| CN211041010U (en) * | 2019-10-16 | 2020-07-17 | 福能(贵州)发电有限公司 | Device for transferring fly ash in ash hopper of economizer |
| CN111140867A (en) * | 2020-01-17 | 2020-05-12 | 江苏中科重工股份有限公司 | Coal economizer outlet ash bucket |
| CN111841155A (en) * | 2020-08-11 | 2020-10-30 | 西安西热锅炉环保工程有限公司 | Device and method for pre-removing coarse particle ash in front of SCR (Selective catalytic reduction) denitration device |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210212 |
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| RJ01 | Rejection of invention patent application after publication |