CN105233632A - Structure and method for enhancing flue gas flow uniformity inside coal-fired power plant desulfurizing tower - Google Patents
Structure and method for enhancing flue gas flow uniformity inside coal-fired power plant desulfurizing tower Download PDFInfo
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- CN105233632A CN105233632A CN201510674665.5A CN201510674665A CN105233632A CN 105233632 A CN105233632 A CN 105233632A CN 201510674665 A CN201510674665 A CN 201510674665A CN 105233632 A CN105233632 A CN 105233632A
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- Prior art keywords
- tray
- flue gas
- tower
- desulfurizing tower
- power plant
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- 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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Links
- 239000003546 flue gas Substances 0.000 title claims abstract description 46
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 230000003009 desulfurizing effect Effects 0.000 title claims abstract description 28
- 230000002708 enhancing effect Effects 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title claims description 6
- 238000005507 spraying Methods 0.000 claims abstract description 13
- 238000006477 desulfuration reaction Methods 0.000 claims description 21
- 230000023556 desulfurization Effects 0.000 claims description 21
- 239000007921 spray Substances 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000003245 coal Substances 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000000428 dust Substances 0.000 description 8
- 239000002002 slurry Substances 0.000 description 7
- 239000000779 smoke Substances 0.000 description 6
- 238000004088 simulation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000001464 adherent effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention discloses a structure for enhancing the flue gas flow uniformity inside a coal-fired power plant desulfurizing tower. Flue gas generated by a power plant boiler is pressurized through a booster fan, then enters the desulfurizing tower, moves in the desulfurizing tower from bottom to top and passes through a tray, spraying layers and a demister in sequence, clean flue gas which is finally formed is discharged into the atmosphere through a chimney, the tray is located above an inlet of the desulfurizing tower and below the lowermost layer of spraying layers, the middle local area of the tray is opened, the annular area at the edge of the tray is closed and is not opened, the opening ratio of the middle local area of the tray is 0.3-0.5, the distance from the inner edge of unopened area to the inner wall of the tower is 1%-5% D, wherein D is the inner diameter of the desulfurizing tower, the unopened area of the tray is warped upward, and an included angle of 120-150 degrees is formed between the unopened area and the opened area of the tray. By means of the structure, the speed of the flue gas at the spraying layers inside the tower can be raised by over 10% relative to deviation, the phenomenon that the flue gas in the desulfurizing tower flows along the wall is effectively reduced, and good environmental protection and economic benefits are achieved.
Description
Technical Field
The invention belongs to the technical field of flue gas treatment of coal-fired power plants, and particularly relates to a structure and a method for enhancing flue gas flow uniformity in a desulfurization tower of a coal-fired power plant.
Background
The flue gas generated by the coal-fired boiler is pressurized by the booster fan and then is sent into the desulfurizing tower. And after the flue gas is upwards contacted with slurry liquid drops sprayed from spray layer nozzles in the desulfurization tower in a counter-current manner, SO2 and dust in the flue gas are adsorbed, demisted by a demister, and discharged to the atmosphere through a chimney. The desulfurizing tower is used as an effective emission reduction device and becomes a facility which is necessary to be put into use when the coal-fired power plant normally operates. With the implementation of the standard of the pollutant and dust emission limit requirement of the coal-fired power plant in China, the desulfurization towers of most power stations need to be improved.
The tray is added in the desulfurizing tower, so that the flowing uniformity of the flue gas can be improved, the desulfurizing efficiency of the desulfurizing tower is improved, and the discharge amount of dust is reduced. However, the traditional tray can not reduce the wall flow phenomenon of flue gas generated after liquid slurry particles near the tower wall are adsorbed by the tower wall in the desulfurization tower, so that the desulfurization and dust removal effects are not ideal.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a structure and a method for enhancing the flow uniformity of flue gas in a desulfurization tower of a coal-fired power plant, which can reduce the wall flow phenomenon of the flue gas in the desulfurization tower, effectively improve the flow uniformity of the flue gas in the desulfurization tower and further improve the desulfurization and dust removal efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a reinforcing flue gas flow uniformity's structure in coal fired power plant desulfurizing tower, the flue gas that power boiler 1 produced gets into the desulfurizing tower after 2 pressure boost of booster fan, from upward operation in the tower, in proper order through tray 7, spray layer 4, defroster 5, and the clean flue gas of final formation passes through chimney 6 rows to the atmosphere, tray 7 is on the desulfurizing tower entry, sprays below the lower floor of layer 4, and the local trompil in the middle of tray 7, the airtight trompil of border annular region.
The opening rate of the middle local area of the tray 7 is 0.3-0.5, the distance from the inner edge of the non-opening area to the inner wall of the tower is 1-5% D, and D is the inner diameter of the desulfurizing tower.
The non-opening area of the tray 7 is tilted upwards and forms an included angle of 120 DEG and 150 DEG with the opening area.
According to the invention, the tray 7 with a central local hole and a closed non-hole edge annular region is arranged above the inlet of the desulfurization tower and below the lowest layer of the spraying layer 4, so that the uniformity of the flow of flue gas in the desulfurization tower of a coal-fired power plant is enhanced.
Compared with the prior art, the invention can improve the relative deviation of the flue gas velocity at the spraying layer in the tower by more than 10 percent, effectively reduces the flue gas wall-pasting phenomenon in the desulfurizing tower, and has good environmental protection and economic benefits.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Fig. 2 is a plan view of a conventional tray.
Fig. 3 is a front view of a conventional tray.
Fig. 4 is a top view of the tray of the present invention.
Fig. 5 is a front view of the tray of the present invention.
Fig. 6 is a lower spray level flue gas flow field profile (fig. 6a conventional tray simulation, fig. 6b inventive tray simulation).
Fig. 7 is a plot of the flue gas flow field for the middle spray level (fig. 7a conventional tray simulation, fig. 7b inventive tray simulation).
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
As shown in figure 1, the flue gas generated by a boiler 1 of the power plant enters the desulfurization tower after being pressurized by a booster fan 2, runs in the tower from bottom to top and sequentially passes through a tray 7, a spraying layer 4 and a demister 5, and dust and SO in the flue gas2The gas is absorbed by the spray liquid drops, the finally formed clean flue gas is discharged to the atmosphere through a chimney 6, and the slurry 3 after absorbing the pollutants and the dust can be recycled. Wherein the tray 7 is positioned above the inlet of the desulfurizing tower and below the lowest layer of the spraying layer 4.
As shown in fig. 2 and 3, the conventional tray 8 is entirely perforated and has a flat plate shape.
As shown in figures 4 and 5, the middle of the tray 7 of the invention is provided with a local hole, the hole opening rate is 0.3-0.5, the edge annular area is sealed and is not provided with a hole, the distance from the inner edge of the non-hole area to the inner wall of the tower is 1% -5% -D, and D is the inner diameter of the desulfurizing tower. The non-opening area is tilted upwards and forms an included angle of 120 DEG and 150 DEG with the opening area, and the whole tray 7 is in a plate shape, thereby preventing slurry from crystallizing and depositing.
The invention relates to a method for enhancing the flow uniformity of flue gas, which is mainly characterized in that a tray 7 with a central local hole and a closed non-hole edge annular region is arranged above an inlet of a desulfurizing tower and below the lowest layer of a spraying layer 4.
The principle of reducing the flue gas wall flow of the desulfurization tower is as follows:
although the slurry particles sprayed by each layer of the spraying layer 4 can cover the cross section of the desulfurization tower, the particles of the slurry near the tower wall are easily adsorbed by the tower wall, so that the slurry particle density has the problems of high central area and low distribution of the tower wall area, and the flow velocity of the flue gas at the tower wall area is higher than that of the central area, thereby forming the phenomenon of flue gas wall-sticking flow. The traditional tray 8 is completely perforated, only plays a role in rectifying the smoke, and cannot effectively reduce the wall flow of the smoke. By adopting the tray 7 of the invention, after the flue gas enters the desulfurizing tower, the rectifying effect on the flue gas is achieved, and the flue gas is forced to flow to the middle area due to the guiding effect of the closed area around the tray 7, so that the wall flow of the flue gas is effectively reduced.
By adopting the tray 7 of the invention, the cross section of the desulfurizing tower at the tray is reduced, the pressure drop of the desulfurizing tower is increased, and CFD simulation of the desulfurizing tower of a 1000MW power station shows that when the width of a closed area is 0.5m (3% D) by adopting the tray 7 of the invention, the pressure drop is increased by 100Pa, but the phenomenon of flue gas adherent flow is obviously improved. FIG. 6 is a smoke velocity cloud chart of a lower spraying layer, FIG. 7 is a smoke velocity cloud chart of a middle spraying layer, and by adopting the tray 7 of the invention, the relative deviation of the smoke velocity at the spraying layer in the tower is improved by 10 percent compared with that of the traditional tray 8, thereby effectively reducing the wall-pasting flow phenomenon of the smoke in the desulfurizing tower.
The relative speed deviation is defined as:
wherein,is the relative deviation of velocity, vmaxIs the maximum value of the flue gas velocity on the cross section, vminIs the minimum value of the flue gas velocity on the cross section, vaveIs the average of the flue gas velocity over the cross section.
The invention has good environmental protection benefit by comprehensively considering various factors such as engineering implementation, pressure drop, desulfurization and dust settling effect and the like.
Claims (4)
1. The utility model provides a structure of reinforcing flue gas flow homogeneity in coal fired power plant desulfurizing tower, the flue gas that power boiler (1) produced gets into the desulfurizing tower after booster fan (2) pressure boost, moves from bottom to top in the tower, in proper order through tray (7), sprays layer (4), defroster (5), and the clean flue gas of final formation is discharged to the atmosphere through chimney (6), a serial communication port, tray (7) are on the desulfurizing tower entry, spray the lowest layer of layer (4) under, the local trompil in the centre of tray (7), the airtight trompil that does not have of border annular region.
2. The structure for enhancing the flow uniformity of flue gas in a desulfurization tower of a coal-fired power plant according to claim 1, wherein the opening ratio of the middle part of the tray (7) is 0.3-0.5, the distance from the inner edge of the non-opening area to the inner wall of the tower is 1-5% D, and D is the inner diameter of the desulfurization tower.
3. The structure for enhancing the flow uniformity of flue gas in the desulfurization tower of the coal-fired power plant as recited in claim 1, wherein the non-opening area of the tray (7) is tilted upwards and forms an included angle of 120-150 degrees with the opening area.
4. The method for enhancing the flue gas flow uniformity in the desulfurization tower of the coal-fired power plant is characterized in that a tray (7) with a middle local hole and an enclosed non-hole edge annular region is arranged above the inlet of the desulfurization tower and below the lowest layer of a spraying layer (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510674665.5A CN105233632B (en) | 2015-10-19 | 2015-10-19 | The structures and methods of enhancing flow of flue gas uniformity in a kind of Desulphurization for Coal-fired Power Plant tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510674665.5A CN105233632B (en) | 2015-10-19 | 2015-10-19 | The structures and methods of enhancing flow of flue gas uniformity in a kind of Desulphurization for Coal-fired Power Plant tower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105233632A true CN105233632A (en) | 2016-01-13 |
| CN105233632B CN105233632B (en) | 2017-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510674665.5A Active CN105233632B (en) | 2015-10-19 | 2015-10-19 | The structures and methods of enhancing flow of flue gas uniformity in a kind of Desulphurization for Coal-fired Power Plant tower |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000210532A (en) * | 1999-01-22 | 2000-08-02 | Nkk Corp | Flue gas desulfurizer |
| CN201329234Y (en) * | 2008-12-11 | 2009-10-21 | 贵阳铝镁设计研究院 | Smoke gas washing device |
| CN103977696A (en) * | 2014-05-16 | 2014-08-13 | 山西清泽环境科技有限公司 | Spray absorption tower suitable for coal-fired boiler flue gas desulfurization and denitrification |
| CN204134449U (en) * | 2014-03-17 | 2015-02-04 | 大丰市佳诣电力燃料有限公司 | A kind of except the clean exhaust gas processing device of haze and system thereof |
-
2015
- 2015-10-19 CN CN201510674665.5A patent/CN105233632B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000210532A (en) * | 1999-01-22 | 2000-08-02 | Nkk Corp | Flue gas desulfurizer |
| CN201329234Y (en) * | 2008-12-11 | 2009-10-21 | 贵阳铝镁设计研究院 | Smoke gas washing device |
| CN204134449U (en) * | 2014-03-17 | 2015-02-04 | 大丰市佳诣电力燃料有限公司 | A kind of except the clean exhaust gas processing device of haze and system thereof |
| CN103977696A (en) * | 2014-05-16 | 2014-08-13 | 山西清泽环境科技有限公司 | Spray absorption tower suitable for coal-fired boiler flue gas desulfurization and denitrification |
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| Publication number | Publication date |
|---|---|
| CN105233632B (en) | 2017-12-01 |
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