CN100427181C - Wet type reaction tower for flue gas desulfurization - Google Patents
Wet type reaction tower for flue gas desulfurization Download PDFInfo
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- CN100427181C CN100427181C CNB200610113462XA CN200610113462A CN100427181C CN 100427181 C CN100427181 C CN 100427181C CN B200610113462X A CNB200610113462X A CN B200610113462XA CN 200610113462 A CN200610113462 A CN 200610113462A CN 100427181 C CN100427181 C CN 100427181C
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Abstract
A wet fume-desulfurizing reaction tower is composed of a slurry collecting segment communicated with external slurry circulating pump, a fume mixing segment, a slurry sprinkling segment with several layers of sprinkling tubes and nozzles, a contraction transition segment between said fume mixing segment and slurry sprinkling segment, a fume defogging segment, fume outlet segment, and fume outlet.
Description
Technical field
The present invention relates to a kind of desulfuration reaction device of combustion apparatus discharging flue gas, particularly a kind of wet type reaction tower for flue gas desulfurization belongs to the flue gas desulfurization technique field.
Background technology
Coal combustion produced pollution thing is the greatest contamination source of causing China's environmental destruction.China's sulfur dioxide (SO2) emissions 90% come spontaneous combustion coal, and total emission volumn surpasses 2,000 ten thousand tons for years, and acid rain district area accounts for 1/3 of area.The task of top priority that has become China's air pollution treatment is administered in coal-fired sulfur dioxide pollution.
The wet process of FGD technology be use in the world at most, the most ripe desulfur technology, adapt to the unit of various sulfur-bearing coals and various power, the domestic and international market occupation rate reaches more than 85%, is one of flue gas desulfurization technique of giving priority to of China.Wherein, reaction tower for stack gas desulfurization is a core apparatus of realizing the wet desulphurization technical performance index.It is dissimilar that the wet desulphurization reaction tower mainly contains spray column, bubble tower, packed tower and liquid column tower etc.Spray column is owing to the flue gas flow rate height, and SR is little is used widely with advantages of simple structure and simple, and two kinds of spray column forms commonly used at present are empty spray column and pallet spray column.
For empty spray column, the desulfurization project that put into operation measured result shows, for the central area on the cross section in the tower, because the even layout of multilayer shower and the whitewashing nozzle that is attached thereto, make whitewashing slurries degree of overlapping on the cross section in tower that nozzle sprayed reach more than 150%, its desulfuration efficiency is up to 99-100%; And in the close circumferential area of tower body wall, owing to flow downward along the tower body wall with the collision of tower body wall from the slurries of slurries nozzle ejection are most of, make that the interior concentration of slurry of this circumferential area is lower, the touch opportunity of flue gas and slurries reduces, can make that simultaneously this regional flow of flue gas resistance is lower, the flue gas phenomenon that is short-circuited, the flue gas desulfurization reaction tower of escaping out along this zone finally causes the desulfuration efficiency of this circumferential area much lower relatively.
For the pallet spray column, patent of invention CN 1050173C and CN1496753A as U.S. The Babcock ﹠ Wilcox Co, by arranging that in tower body one deck or several layers cover the pallet of the tape punching of whole tower body cross section, utilize pallet to guide the flue gas that upwards flows again, with the contact area and the time of contact of flue gas and slurries in the increase tower, thereby realize sufficient gas-liquid contact reaction in the tower.Its weak point is: because the desulfuration efficiency of central area is up to 99-100% in the tower, the central area is provided with the pallet of tape punching in tower, and is very little to the contribution that improves desulfuration efficiency, makes the system flow resistance increase greatly on the contrary.
In addition, wet type reaction tower for flue gas desulfurization adopts a unidirectional smoke inlet usually at present, after flue gas enters desulfurization reaction tower through smoke inlet, because the inertia of air motion, make near the tower inner region air velocity of smoke inlet side low, and the air velocity height of that the side tower inner region far away apart from smoke inlet, cause the air-flow distributed pole on the interior cross section of whole tower inhomogeneous, not only worsened the gas-liquid contact conditions, influence system's desulfuration efficiency, and, cause system's running resistance to increase because air motion is comparatively disorderly.
Therefore, in wet method fume desulfurizing system, gas-liquid two-phase flow field tissue in the desulfurization reaction tower, especially flue gas has just entered gas phase flow field behind the tower body and near the gas-liquid two-phase flow field tissue the tower body wall, is the key factor that can decision systems realize high desulfurization efficiency and low operating cost simultaneously.
Summary of the invention
The problem that desulfuration efficiency is lower or the system flow resistance is bigger at the existence in engineering is used of existing wet type reaction tower for flue gas desulfurization, the present invention proposes a kind of wet type reaction tower for flue gas desulfurization, can improve flowing of near flue gas of tower body wall and drop preferably, alleviate tower wall neighbouring flue gas short circuit phenomenon and drop wall sticking phenomenon, effectively organize the abundant mixing of gas-liquid two-phase in the fume desulfurizing tower, thereby realize the purpose of raising system desulfurization degree and reduction system flow resistance simultaneously.
The present invention is achieved by the following technical solutions:
A kind of wet type reaction tower for flue gas desulfurization, comprise the slurries collection section, smoke mixing section, the slurries spray section, flue gas demist section and exhanst gas outlet section, be provided with smoke inlet in smoke mixing section, arrange several layers shower and slurries nozzle in the slurries spray section, be provided with exhanst gas outlet in the exhanst gas outlet section, the slurries collection section slurry circulating pump outer with placing tower is connected, between slurry circulating pump and shower, be provided with the slurries circulating line, it is characterized in that arranging one or some inlet flue gas deflector, and between smoke mixing section and slurries spray section, arrange the contraction changeover portion of one deck or several layers in smoke mixing section.
Inlet flue gas deflector of the present invention is made up of upper vertical section and lower tilt section, the incline direction of lower tilt section is in face of smoke inlet, the shape of described lower tilt section adopts linear pattern or arc line type, and the angle β of linear lower tilt section and tower body center line is 10～45 °.
The tower body diameter ratio of the height of contraction changeover portion of the present invention and smoke mixing section is 0.01～0.15; The tower body diameter ratio of described slurries spray section and smoke mixing section is 0.7～0.9.
Distance between the bottom surface of contraction changeover portion of the present invention and the bottom surface of smoke inlet is 3～10m.
The present invention compared with prior art has the following advantages and the high-lighting effect:
By arrange one or some inlet flue gas deflector in the smoke mixing section of wet type reaction tower for flue gas desulfurization, and between smoke mixing section and slurries spray section, arrange the contraction changeover portion of one deck or several layers, thereby guiding enters the flue gas change flow direction of desulfurization reaction tower and moves upward, it is comparatively even to make that tower body cross section overdraught distributes, and by the contraction changeover portion of being arranged between smoke mixing section and the slurries spray section, improve flowing of near flue gas of tower body wall and drop, alleviate tower wall neighbouring flue gas short circuit phenomenon and drop wall sticking phenomenon, strengthen drop and near the touch opportunity of the flue gas tower body inwall, effectively organize the abundant mixing of gas-liquid two-phase in the fume desulfurizing tower, thereby realize the purpose of raising system desulfuration efficiency and reduction system flow resistance simultaneously.The present invention can be at lower liquid-gas ratio (L/G=8-12L/m
3) under, reach higher desulfuration efficiency (more than 95%).In addition, between smoke mixing section and slurries spray section, arrange and shrink changeover portion, strengthened the gas-liquid mixed degree of tower wall near zone, make the tower body diameter reduce, the corrosion resisting alloy steel consumption of desulfurization reaction tower costliness reduces, thereby reaches advantages such as raising system desulfurization performance, minimizing operating cost and saving initial cost.
Description of drawings
Fig. 1 is a wet type reaction tower for flue gas desulfurization structural representation provided by the present invention.
Fig. 2 is the structural representation of inlet flue gas deflector.
Fig. 3 is the A-A profile of Fig. 1.
Among the figure: 1-slurries collection section; The 2-smoke mixing section; 3-slurries spray section; 4-flue gas demist section; 5-exhanst gas outlet section; The 6-smoke inlet; The 7-shower; 8-slurries nozzle; The 9-exhanst gas outlet; The 10-slurry circulating pump; 11-slurries circulating line; 12-inlet flue gas deflector; 13-shrinks changeover portion.
The specific embodiment
Below in conjunction with accompanying drawing principle of the present invention, concrete structure and preferred implementation are described further.
Fig. 1 is a wet type reaction tower for flue gas desulfurization structural representation provided by the present invention.This wet type reaction tower for flue gas desulfurization comprises from bottom to up successively: slurries collection section 1, smoke mixing section 2, contraction changeover portion 13, slurries spray section 3, flue gas demist section 4 and exhanst gas outlet section 5 and exhanst gas outlet 9, be provided with smoke inlet 6 in smoke mixing section 2, arrange several layers shower 7 and slurries nozzle 8 in slurries spray section 3, slurries collection section 1 slurry circulating pump 10 outer with placing tower is connected, between slurry circulating pump 10 and shower 7, be provided with slurries circulating line 11, and in smoke mixing section 2, arrange one or some block entrance smoke deflectors 12.Between smoke mixing section 2 and slurries spray section 3, arrange and shrink changeover portion 13, alleviated near flue gas short circuit phenomenon and the drop wall sticking phenomenon of tower wall, strengthened near drop and the flue gas touch opportunity the tower body inwall, effectively organize the abundant mixing of gas-liquid two-phase in the fume desulfurizing tower, thereby realized improvement system desulfurized effect simultaneously and reduced the system flow resistance.At lower liquid-gas ratio (L/G=8-12L/m
3) under, realize higher desulfuration efficiency (more than 95%).In addition, arrange between smoke mixing section 2 and slurries spray section 3 and shrink changeover portion 13 that strengthened the gas-liquid mixed degree of tower wall near zone greatly, gas-liquid mass transfer efficient increases, make the tower body diameter reduce to some extent, thereby reduced corrosion resisting alloy steel consumption expensive in the tower.Arrange one or some inlet flue gas deflector 12 in smoke mixing section 2, guiding enters the flue gas change flow direction of desulfurization reaction tower and moves upward under the guide effect of inlet flue gas deflector 12, make the interior cross section overdraught of tower distribute comparatively even, not only significantly improved air-flow problem pockety in the tower, and because the nearly fairshaped guide effect of employing greatly reduces the system flow drag losses in the smoke mixing section 2.
On the basis of such scheme, in order to improve system's desulfuration efficiency better and to reduce the system flow resistance, the contraction changeover portion that is arranged between smoke mixing section 2 and the slurries spray section 3 can be arranged one deck or several layers according to actual conditions, and the distance between the bottom surface of its contraction changeover portion 13 and the bottom surface of smoke inlet 6 is 3～10m.Shrinking the height of changeover portion 13 and the tower body diameter ratio of smoke mixing section 2 is 0.01～0.15.Slurries spray section 3 is 0.7～0.9 with the tower body diameter ratio of smoke mixing section 2.
Fig. 2 and Fig. 3 have provided structural representation and its vertical view of arranging of inlet flue gas deflector 12 in desulfurization reaction tower.Among Fig. 2, inlet flue gas deflector 12 is made up of upper vertical section and lower tilt section, the incline direction of lower tilt section is in face of smoke inlet 2, and the shape of lower tilt section adopts linear pattern or arc line type, and the angle β of linear lower tilt section and tower body center line is 10～45 °.Among Fig. 3, inlet flue gas deflector 12 is connected with the tower body wall of smoke mixing section 2 on width.According to the concrete condition of inlet flue gas flow and velocity attitude, the distance between the inlet flue gas deflector 12 can equate or not wait.
Operation principle of the present invention is:
Need desulfurization flue gas from combustion apparatus is discharged enters the smoke inlet 6 that is located on the smoke mixing section 2, and the average speed of flue gas in smoke inlet 6 is 10m/s.After flue gas enters the smoke mixing section 2 of desulfurization reaction tower through gas approach 6, under the guide effect of inlet flue gas deflector 12, change flow direction and upwards mobile, make the interior cross section overdraught of tower distribute comparatively even, not only significantly improved air-flow problem pockety in the tower, and because the nearly fairshaped guide effect of employing greatly reduces the system flow drag losses in the smoke mixing section 2.Air-flow distributes comparatively uniformly, and flue gas fully contacts with the slurries drop that the slurries nozzle 8 that is connected from shower 7 sprays downwards.The mean flow rate of flue gas is 2-4m/s in the slurries spray section 3 of desulfurization reaction tower, and slurries drop velocity component vertically downward is about 7m/s, and the relative velocity of drop and flue gas is 9-11m/s.The particle size range of slurries drop is 1-3mm.Sulfur in smoke (SO
2) with absorbent slurry in calcium carbonate (CaCO
3) and the airborne oxygen (O that blasts
2) chemical reaction takes place, generate gypsum (CaSO
42H
2O).Because the improvement of flow distribution evenness, makes to have reached the good result that the system flow resistance reduces and system's desulfuration efficiency increases simultaneously at the time of contact that has strengthened flue gas and slurries drop.
Flue gas after the desulfurization enters the flue gas demist section 4 on desulfurization reaction tower top, and the entrained drop all or almost all of flue gas is separated, and flue gas leaves desulfurization reaction tower by the exhanst gas outlet 9 that is connected with the exhanst gas outlet section 5 of desulphurization reaction top of tower subsequently.Be arranged in slurries drop that slurries nozzle 8 that the shower 7 of slurries spray section 3 connects sprayed and then flow into the slurries collection section 1 of desulphurization reaction tower body bottom, slurries in the slurries collection section 1 are under the effect of slurry circulating pump 10, and 11 circulations are transported in three layers of shower 7 on the desulfurization reaction tower slurries spray section 3 through the slurries carrier pipes.Absorbent slurry contacts in tower with flue gas repeatedly through slurry circulating pump 10, calcium utilization height, calcium sulfur ratio low (being generally 1.03).
Claims (3)
1. wet type reaction tower for flue gas desulfurization, this reaction tower contains slurries collection section (1) from bottom to up successively, smoke mixing section (2), slurries spray section (3), flue gas demist section (4), exhanst gas outlet section (5) and exhanst gas outlet (9), be provided with smoke inlet (6) in described smoke mixing section (2), be furnished with several layers shower (7) and slurries nozzle (8) in slurries spray section (3), described slurries collection section (1) slurry circulating pump (10) outer with placing tower is connected, between slurry circulating pump (10) and shower (7), be provided with slurries circulating line (11), it is characterized in that: in smoke mixing section (2), arrange one or some block entrance smoke deflectors (12), and arrange that between smoke mixing section (2) and slurries spray section (3) one deck shrinks changeover portion (13) at least; Distance between the bottom surface of described contraction changeover portion and the bottom surface of smoke inlet is 3～10m; The tower body diameter ratio of the height of described contraction changeover portion and smoke mixing section is 0.01～0.15; The tower body diameter ratio of described slurries spray section and smoke mixing section is 0.7～0.9.
2. wet type reaction tower for flue gas desulfurization according to claim 1 is characterized in that: described inlet flue gas deflector is made up of upper vertical section and lower tilt section, and the incline direction of lower tilt section is in face of smoke inlet.
3. wet type reaction tower for flue gas desulfurization according to claim 2 is characterized in that: the shape of described lower tilt section adopts linear pattern or arc line type, and linear lower tilt section angle β downward and the tower body center line is 10～45 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610113462XA CN100427181C (en) | 2006-09-29 | 2006-09-29 | Wet type reaction tower for flue gas desulfurization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610113462XA CN100427181C (en) | 2006-09-29 | 2006-09-29 | Wet type reaction tower for flue gas desulfurization |
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| CN1958132A CN1958132A (en) | 2007-05-09 |
| CN100427181C true CN100427181C (en) | 2008-10-22 |
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| CN101862587A (en) * | 2010-05-10 | 2010-10-20 | 上海电气石川岛电站环保工程有限公司 | Wet flue-gas desulfurization tower based on baffle air distribution |
| CN103191636B (en) * | 2013-03-21 | 2015-01-07 | 北京中冶设备研究设计总院有限公司 | Desulfurizing tower device |
| CN103521066B (en) * | 2013-10-25 | 2015-12-30 | 北京中航泰达环保科技股份有限公司 | Force turbulent fume desulfurizing tower |
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| CN114797409A (en) * | 2022-04-28 | 2022-07-29 | 中国华电科工集团有限公司 | Slurry spraying system for wet desulphurization and integrative tower of wet desulphurization and chimney |
| CN114849436A (en) * | 2022-04-28 | 2022-08-05 | 中国华电科工集团有限公司 | Low-resistance energy-saving wet desulphurization slurry spraying system and desulphurization, dehumidification and integration tower |
| CN114788995A (en) * | 2022-04-28 | 2022-07-26 | 中国华电科工集团有限公司 | Low-resistance energy-saving slurry spraying system for wet desulphurization and desulfurizing tower |
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| CN1229168C (en) * | 2001-03-14 | 2005-11-30 | 清华大学 | Integrated liquid column spraying fume desulfurizing and dust eliminating method and apparatus |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85104366A (en) * | 1984-02-20 | 1986-12-03 | 巴布考克日立株式会社 | Installation for wet-removal of sulphur from flue gas |
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| CN1958132A (en) | 2007-05-09 |
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