CN104174284A - Single-tower double-loop limestone-gypsum wet-method desulfuration device and method - Google Patents

Single-tower double-loop limestone-gypsum wet-method desulfuration device and method Download PDF

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Publication number
CN104174284A
CN104174284A CN201410466865.7A CN201410466865A CN104174284A CN 104174284 A CN104174284 A CN 104174284A CN 201410466865 A CN201410466865 A CN 201410466865A CN 104174284 A CN104174284 A CN 104174284A
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slurries
absorption tower
flue gas
cocycle
double loop
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Inventor
杨宝成
许德富
华桂宏
刘磊
马以青
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JIANGSU FENGYE TECHNOLOGY & ENVIRONMENT GROUP Corp Ltd
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JIANGSU FENGYE TECHNOLOGY & ENVIRONMENT GROUP Corp Ltd
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Abstract

The invention discloses a single-tower double-loop limestone-gypsum wet-method desulfuration device and a desulfuration method, comprising a first-stage spraying system 3, a double-loop partition plate 5, a second-stage spraying system 6 and an absorption tower outlet 9 which are arranged in an absorption tower in sequence from bottom to top. The single-tower double-loop limestone-gypsum wet-method desulfuration device with relatively high desulfuration efficiency and the desulfuration method can meet the requirement of a smoke discharging standard of a power plant; meanwhile, the problem that energy-saving running of a system cannot be realized by changing a desulfuration running mode of the absorption tower according to the change of the type of coals is solved; the running cost is lowered; furthermore, the device and the method also realize uniform distribution of smoke in an absorption tower system, and the phenomenon that the desulfuration efficiency is reduced due to escape of the smoke caused by a wall flow effect is avoided.

Description

A kind of Dan Ta double loop limestone-gypsum desulphurization system and method
Technical field
The present invention relates to a kind of limestone-gypsum desulphurization system and sulfur method, particularly a kind of Dan Ta double loop limestone-gypsum desulphurization system and sulfur method.
Background technology
At present, means of flue gas desulfurization of power plant method mainly contains: recirculating fluidized bed flue gas semidry method, seawater method, wet-type ammonia, limestone/lime-gypsum wet method.Wherein, process for flue gas desulfurization by limestone/lime-gypsum wet technique is the most ripe, the most widely used flue gas desulfurization technique of technology.Spray column is in process for flue gas desulfurization by limestone/lime-gypsum wet, to apply maximum pyramidal structures, by the downward spraying (Bidirectional nozzle spraying up and down simultaneously) of Multi-layer sprinkling layer, contacts the SO absorbing wherein with flue gas adverse current 2, owing to there being Multi-layer sprinkling layer, the spray coverage rate on cross section, absorption tower can reach very high, and every layer of corresponding slurry circulating pump of spraying layer is for slurry.Because circulating pump is more with the spray number of plies, especially for medium-high sulfur coal, therefore absorption tower is generally higher, slurry pool of absorption tower also power consumption large, circulating pump is higher, but spray column has the following advantages: 1) desulfuration efficiency is high: desulfuration efficiency generally can reach more than 95%, sprays the number of plies and spray flux can reach more than 97% desulfuration efficiency by increase; 2) system reliability and availability are high: although spray column still exists absorption tower burn into wearing and tearing, fouling and blockage problem, by the optimal control of operation, substantially can control within the acceptable range; 3) system suitability is strong: in the design phase, can design different absorption tower parameters adapt in the coal-fired sulphur content of height, at present the spray column of operation has more case for basic, normal, high coal-fired sulphur content; For the device that puts into operation, when fire coal is lower than design sulphur content or during compared with underload, can reduce power consumption by the mode of stopping circulating pump, pump operating cycle combination is flexibly.
In recent years, be subject to the variable effect of coal market, the coal-fired sulfur content fluctuation of electricity power enterprise, some sulfurs reach more than 3%, considerably beyond the designed capacity of original desulfurizer, and various countries are also tending towards strictly for the discharge standard of atmosphere pollution, for example 50mg/m is carried out in some national regulation key area 3sulfur dioxide (SO2) emissions limit value, therefore, original traditional lime stone-Wet Flue Gas Desulfurization Technique cannot meet environmental requirement, must carry out upgrading.
A kind of double circulation loop Limestone-gypsum Wet Flue Gas Desulfurization Process method and device are disclosed in patent documentation CN1843571A and CN2894808Y, drip tray is set in desulfurizing tower desulfurization zone is divided into upper and lower circulation desulfurization district, in lower circulation desulfurization district, lower circulation and oxidation pond and lower circulating pump are common forms lower circulation desulfurization system, in cocycle desulfurization zone, cocycle and oxidation pond and cocycle pump jointly form cocycle desulphurization system, in a desulfurizing tower, form relatively independent double circulation desulphurization system, the desulfurization of flue gas is completed jointly by double circulation desulphurization system.
Patent documentation CN102764583A arranges drip tray desulfurization zone is divided into upper and lower circulation desulfurization district in desulfurizing tower, in lower circulation desulfurization district, lower circulation and oxidation pond and lower circulating pump are common forms lower circulation desulfurization system, in cocycle desulfurization zone, cocycle and oxidation pond and cocycle pump jointly form cocycle desulphurization system, in a desulfurizing tower, form relatively independent double circulation desulphurization system, the desulfurization of flue gas is completed jointly by double circulation desulphurization system.
Non-patent literature " problem in Limestone-gypsum Wet Flue Gas Desulfurization Process technology " (" Sichuan Electric Power technology " the 4th phase in 2002,39-43 page) provide a kind of optimize after two circulation wet scrubbing techniques (DLWS), absorption tower is divided into two parts by liquid collecting bucket: cocycle and lower circulation, cocycle is the absorber portion of sulfur dioxide, the pH value of cocycle the best is 6, lower circulation is oxidation cooling section, the slurries of lower circulation are from the overflowing liquid of slurry tank outside absorption tower and the recycle-water of gypsum dehydration system, and the optimal pH of its operation is 4.
But, in above-mentioned disclosed double circulation desulphurization device and method, all have the following disadvantages and defect: 1) be only provided with a former gas approach in lower closed circuit district, can not be according to the variation of coal sulfur content, SR and blower pressure in change system, thus may cause system operation cost to increase; 2) between double circulation loop, smoke distribution is inhomogeneous, may produce wall stream effect simultaneously, causes that flue gas escape causes that desulfuration efficiency declines.
The above-mentioned defect existing for overcoming prior art, the invention provides a kind of Dan Ta double loop limestone-gypsum desulphurization system and method.
Summary of the invention
Of the present invention have a requirement that can meet power-plant flue gas discharge standard compared with the Dan Ta double loop limestone-gypsum desulphurization system of high desulfurization efficiency and sulfur method, solve simultaneously and cannot change the problem that absorption tower desulfurization operation mode is moved energy saving of system according to the variation of coal, reduce operating cost, the flue gas that apparatus of the present invention and method have also realized in the system of absorption tower is in addition uniformly distributed, and avoids wall stream effect to bring flue gas to escape and causes that desulfuration efficiency declines.
One aspect of the present invention provides a kind of Dan Ta double loop limestone-gypsum desulphurization system, comprise absorption tower, one-level spray system 3, double loop dividing plate 5, secondary spray system 6 and absorption tower outlet 9, described one-level spray system 3, double loop dividing plate 5, secondary spray system 6 and absorption tower outlet 9 set gradually from the bottom to top in absorption tower.
One-level spray system 3 of the present invention comprises slurries oxidation pond 1, lower circulated sprinkling layer 4 and lower circulating absorption tower entrance 11, described slurries oxidation pond 1, lower circulating absorption tower entrance 11 and lower circulated sprinkling layer 4 are set in turn in the bottom on absorption tower from the bottom to top, and described slurries oxidation pond 1 is connected by lower loop slurry circulating pump 2 with lower circulated sprinkling layer 4.
Secondary spray system 6 of the present invention comprises cocycle spraying layer 7, cocycle absorption tower entrance 10, described cocycle absorption tower entrance 10 and cocycle spraying layer 7 are set in turn in the top of one-level spray system 3 in absorption tower from the bottom to top, and described cocycle spraying layer 7 is connected with the slurry circulation case 12 that is arranged at outside, absorption tower by cocycle slurry circulating pump 13.
Double loop of the present invention dividing plate 5 is arranged in absorption tower between one-level spray system 3 and secondary spray system 6, absorption tower is divided into two desulfurization regions, on described double loop dividing plate 5, offer dividing plate perforate 510, its effect is to allow flue gas pass through, and can ensure again the relatively independent operation of double circulation desulphurization system.
In a preferred embodiment of the present invention, described double loop dividing plate 5 is connected 16 transition of employing arc and connects with absorption tower wall 99, and it can avoid wall stream effect to bring flue gas escape to cause that desulfuration efficiency declines.
In another preferred embodiment of the present invention, on described double loop dividing plate 5, arrange between flow apron 520 and double loop dividing plate 5 and slurry circulation case 12 and be provided with two-grade desulfurizing loop slurry conduit 14 for collecting slurries, the slurries of collecting in cocycle enter slurry circulation case 12 by the collecting tank that is arranged on absorption tower surrounding by two-grade desulfurizing loop slurry conduit 14, play the slurries effect of collecting.The slurries of collecting due to double loop dividing plate 5 are discharged to slurry circulation case 12 by the outer collection conduit of tower, reduce the height on absorption tower than the conduit in tower.The flow apron 520 arranging on described double loop dividing plate 5 can be to form owing to upwards digging dividing plate perforate on dividing plate.
In an embodiment of the invention, described lower circulating absorption tower entrance 11 upwards becomes arbitrarily angled with cocycle absorption tower entrance 10 at horizontal plane projecting direction.
In the limestone-gypsum desulphurization system of Dan Ta of the present invention double loop owing to being provided with two smoke inlets, cocycle absorption tower entrance 11 and lower circulating absorption tower entrance 10, in the time that fire coal changes greatly, when two-grade desulfurizing can meet sulfur dioxide (SO2) emissions requirement completely, flue gas enters cocycle absorption tower entrance 11, system drag overall can reduce and is about 980pa, thereby reduces the resistance of blower fan, reduces system operation cost.
In a specific embodiment of the present invention, between described secondary spray system and slurry circulation case, be also provided with pressure-equalizing passageway 15, described pressure-equalizing passageway 15 is consistent the pressure of absorption tower internal pressure and slurry circulation case 12, avoid pump operating cycle to cause slurry circulation case pressure initiation negative pressure, slurry circulation case 12 structures are damaged, be unfavorable for system operation steady in a long-term.Pressure-equalizing passageway 15 of the present invention can, for being provided with the engineering pipeline of pressure equaliser, be provided with the engineering pipeline of equilibrated valve or pressurizer, also can for example, for having the pipeline of pressure balance effect, bellows.
In a specific embodiment of the present invention, between described secondary spray system 6 and absorption tower outlet 9, be also provided with demister 8.Demister 8 of the present invention can be selected kind known in the art, and in an embodiment of the invention, described demister is baffle plate type machinery demister.
Another aspect of the present invention provides a kind of Dan Ta double loop Limestone-gypsum Wet Flue Gas Desulfurization Process method, comprising:
1) export sulfur dioxide concentration requirement after obtaining the concentration of former sulfur dioxide in flue gas or flue gas desulfurization;
2) as the concentration > of former sulfur dioxide in flue gas 3200mg/Nm 3or after flue gas desulfurization, export the concentration requirement≤50mg/Nm of SO 2 from fume 3time, former flue gas enters from lower circulating absorption tower entrance 11 slurries that absorption tower sprays with lower circulated sprinkling layer 4 through one-level spray system 3 and contacts, continue to rise, enter secondary spray system 6 by double loop dividing plate 5, the slurries that spray with cocycle spraying layer 7 contact, and the flue gas forming after desulfurization exports and discharges through absorption tower 9.
The slurries that described lower circulated sprinkling layer 4 sprays are that the slurries in slurries oxidation pond 1 are delivered to lower circulated sprinkling layer 4 by lower loop slurry circulating pump 2, and the slurries that described cocycle spraying layer 7 sprays are that the slurries of slurry circulation case 12 are delivered to cocycle spraying layer 7 by cocycle slurry circulating pump 13.
3) as the concentration≤3200mg/Nm of former sulfur dioxide in flue gas 3or after flue gas desulfurization, export the concentration requirement > 50mg/Nm of SO 2 from fume 3time, former flue gas enters absorption tower from cocycle absorption tower entrance 10 and enters secondary spray system 6, and the slurries that spray with cocycle spraying layer 7 contact, and the flue gas forming after desulfurization exports and discharges through absorption tower 9.
Wherein, part slurries (major part) are by double loop dividing plate 5 collecting actions, slurries are transferred in slurry circulation case 12, another part (fraction) slurries enter slurries oxidation pond 1 by double loop dividing plate 5, be transported to slurry circulation case by delivery pump again, complete recycling of whole slurries.In the time that flue gas enters absorption tower by cocycle absorption tower entrance 10, lower loop slurry circulating pump 2 is out of service, to save energy consumption.The slurries that described cocycle spraying layer 7 sprays are that the slurries of slurry circulation case 12 are delivered to cocycle spraying layer 7 by cocycle slurry circulating pump 13.
In an embodiment of the invention, the slurries pH in slurries oxidation pond 1 is 4.2-5.2.Because desulfurization emphasis is the pH that controls slurries oxidation pond in the one-level spraying layer of absorption tower, control between 4.2-5.2 and utilize calcium sulfite good feature of oxidation effectiveness under acid condition when pH value, pass into excessive oxidation air at slurries oxidation pond, obtain high-quality gypsum.
In an embodiment of the invention, the oxidation air oxidation that the slurries in slurries oxidation pond 1 are provided by oxidation fan becomes gypsum, is delivered to tower enters dewatering system outward by gypsum excavationg pump, dewaters.
In an embodiment of the invention, the used up lime stone slurry of slurries oxidation pond 1, by slurries supply in slurry circulation case 12, maintains the desulfurization material balance of one-level spray system.
In an embodiment of the invention, slurries pH >=6 in slurry circulation case 12, the slurries of slurry circulation case 12 are delivered to cocycle spraying layer 7 by cocycle pump 13, collect back slurry circulation case 12 by double loop dividing plate 4.Desulfurization slurry in secondary spray system is because needs obtain higher desulfuration efficiency, thereby maintain higher pH value, add excessive lime stone slurry, the slurries of sulfur dioxide absorption, calcium sulfate, calcium sulfite and lime stone slurry occupy slurries overwhelming majority ratio, reach more than 98%, in slurry circulation case, pass into oxidation air, part calcium sulfite oxidation is calcium sulfate, contains calcium sulfate, calcium sulfite and lime stone slurry and is transported in slurries oxidation pond by slurries shifting pump.In an embodiment of the invention, in slurry circulation case, add excessive lime stone slurry and pass into oxidation air.
In an embodiment of the invention, after the slurries that in described secondary spray system 6, cocycle spraying layer 7 sprays contact with flue gas, a part enters slurries oxidation pond 1 by two circuit separator perforation, the desulfurizing agent of losing for supplementing first grade desulfurizing, another part is by collecting back slurry circulation case 12 by double loop dividing plate under Action of Gravity Field.
In an embodiment of the invention, after the concentration of former sulfur dioxide in flue gas or flue gas desulfurization, export sulfur dioxide concentration and detect the detection method that can adopt the familiar sulfur dioxide in this area, such as infrared absorption method, ultraviolet absorption method etc.
Dan Ta of the present invention double loop limestone-gypsum desulphurization system is provided with two smoke inlets, can change the mode that flue gas enters absorption tower that changes with fire coal, thereby reduce the resistance of SR and blower fan, reduces system operation cost.Meanwhile, in desulfurizer, be provided with pressure-equalizing passageway 15 and loop dividing plate 5, can make isostasy, steady air current in absorption tower, prevent wall stream effect, be conducive to the long-term stability operation of system.Compared with traditional spray column absorption techniques, sulfur method of the present invention can reach more than 98.5 desulfuration efficiencies, and reaches effects of energy saving and emission reduction, and owing to thering is good dual-purpose with original system, be convenient to transform the desulfurizer of original limestone-gypsum, reduce engineering cost.
Brief description of the drawings
Accompanying drawing 1 is Dan Ta of the present invention double loop limestone-gypsum desulphurization system structural representation.
Wherein: 1-slurries oxidation pond; Loop slurry circulating pump under 2-; 3-one-level spray system; Circulated sprinkling layer under 4-; 5-double loop dividing plate; 6-secondary spray system; 7-cocycle spraying layer; 8-demister; The outlet of 9-absorption tower; 10-cocycle absorption tower entrance; Circulating absorption tower entrance under 11-; 12-slurry circulation case; 13-cocycle slurry circulating pump; 14-two-grade desulfurizing loop slurry conduit; 15-pressure-equalizing passageway
Accompanying drawing 2 is double loop of the present invention diaphragm structure schematic diagram.
Wherein: 99-absorbing tower wall; 5-double loop dividing plate; 16-arc
Accompanying drawing 3 is double loop of the present invention dividing plate cross-sectional view.
Wherein: 5-double loop dividing plate; The perforate of 510-dividing plate; 520-flow apron
Detailed description of the invention
Embodiment 1 Dan Ta double loop limestone-gypsum desulphurization system
Dan Ta of the present invention double loop limestone-gypsum desulphurization system shown in 1 with reference to the accompanying drawings, wherein one-level spray system 3, double loop dividing plate 5, secondary spray system 6 and absorption tower outlet 9 set gradually from the bottom to top in absorption tower.Wherein one-level spray system 3 comprises slurries oxidation pond 1, lower circulated sprinkling layer 4 and lower circulating absorption tower entrance 11, slurries oxidation pond 1, lower circulating absorption tower entrance 11 and lower circulated sprinkling layer 4 are arranged at the bottom on absorption tower from down to up, and slurries oxidation pond 1 is connected by lower loop slurry circulating pump 2 with lower circulated sprinkling layer 4.Secondary spray system 6 comprises cocycle spraying layer 7, cocycle absorption tower entrance 10, cocycle spraying layer 7 and cocycle absorption tower entrance 10 are arranged at the top of one-level spray system 3 in absorption tower, and cocycle spraying layer 7 is connected with the slurry circulation case 12 that is arranged at outside, absorption tower by cocycle slurry circulating pump 13.Double loop dividing plate 5 is arranged in absorption tower between one-level spray system 3 and secondary spray system 6, on it, offer dividing plate perforate 510, on double loop dividing plate 5, arrange between flow apron 520 and double loop dividing plate 5 and slurry circulation case 12 and be provided with two-grade desulfurizing loop slurry conduit 14 for collecting slurries, the slurries of collecting in cocycle enter slurry circulation case 12 by the collecting tank that is arranged on absorption tower surrounding by two-grade desulfurizing loop slurry conduit 14, play the slurries effect of collecting.Double loop dividing plate is connected the transition of employing arc with tower wall.
Embodiment 2 Dan Ta double loop Limestone-gypsum Wet Flue Gas Desulfurization Process methods
After detecting the concentration of former sulfur dioxide in flue gas or flue gas desulfurization, export sulfur dioxide concentration;
When the concentration > of sulfur dioxide in flue gas 3200mg/Nm3 (mark state, butt, 6% oxygen), after flue gas desulfurization, export concentration requirement≤50mg/Nm3 (mark state of sulfur dioxide, butt, 6% oxygen) time, higher owing to exporting the emission request of sulfur dioxide after flue gas desulfurization, former flue gas need to enter absorption tower from lower circulating absorption tower entrance 11, through one-level spray system 3, remove the sulfur dioxide of part in flue gas, desulfuration efficiency is between 70-80%, slurries in slurries oxidation pond 1 are carried by one-level slurry circulating pump 2, slurries uninterruptedly circulate in first grade desulfurizing region, absorption tower.In absorption tower one-level spray system 3 and slurries oxidation pond 1, pH value is controlled between 4.2-5.2, utilizes calcium sulfite good feature of oxidation effectiveness under acid condition, passes into excessive oxidation air in slurries oxidation pond 1, obtains high-quality gypsum.Flue gas continues to rise through first grade desulfurizing, by double loop dividing plate 5, dividing plate 5 perforates in double loop are upwards provided with flow apron 520, and the slurries of collection enter slurry circulation case 12 by the collecting tank of absorption tower surrounding by two-grade desulfurizing loop slurry conduit 14, play the slurries effect of collecting.Continue to rise through the flue gas of double loop dividing plate 5, continue to remove sulfur dioxide in flue gas through secondary spray system 6, slurries control pH value >=6 in absorption tower secondary spray system 6 and slurry circulation case 12, after in secondary spray system, slurries contact with flue gas, fraction enters slurries oxidation pond 1 by the hole of double loop dividing plate perforate 510, the desulfurizing agent of losing for supplementing first grade desulfurizing, major part is collected back slurry circulation case 12 by the slurries under Action of Gravity Field by double loop dividing plate 5.
The oxidation air oxidation that the slurries of slurries oxidation pond 1 are provided by oxidation fan becomes gypsum, is delivered to tower enters dewatering system outward by gypsum excavationg pump, dewaters.And the used up lime stone slurry of slurries oxidation pond is by slurries supply in slurry circulation case 12, maintain the desulfurization material balance of one-level spray system 3.
Slurry circulation case 12 is because needs maintain higher pH value, add excessive lime stone slurry, the slurries of sulfur dioxide absorption, calcium sulfate, calcium sulfite and lime stone slurry occupy slurries overwhelming majority ratio, reach more than 98%, in slurry circulation case, pass into oxidation air, part calcium sulfite oxidation is calcium sulfate, contains calcium sulfate, calcium sulfite and lime stone slurry and is transported in slurries oxidation pond by slurries shifting pump.
Finally, the flue gas after purification is sent from absorption tower goes out, the discharge standard of outlet sulfur dioxide≤50mg/Nm3 (mark state, butt, 6% oxygen).
As the concentration≤3200mg/Nm of former sulfur dioxide in flue gas 3or after flue gas desulfurization, export SO 2 from fume require > 50mg/Nm 3time, former flue gas enters absorption tower from cocycle absorption tower entrance 10 and enters secondary spray system 6, contacts with the slurries of cocycle spraying layer spray 7, and the flue gas forming after desulfurization exports and discharges through absorption tower.Slurries are most of to be transferred to slurries in cocycle slurry tank 12 by double loop dividing plate 5 collecting actions, and fraction slurries enter slurries oxidation pond 1 by double loop dividing plate 5, then are transported to cocycle slurry tank 12 by delivery pump, complete recycling of whole slurries.In the time that flue gas enters absorption tower by cocycle absorption tower entrance 10, lower loop slurry circulating pump 2 is out of service, to save energy consumption.
Embodiment in above-described embodiment can further combine or replace; and embodiment is described the preferred embodiments of the present invention; not the spirit and scope of the present invention are limited; do not departing under the prerequisite of design philosophy of the present invention; the various changes and modifications that those skilled in the art make, all belong to protection scope of the present invention.

Claims (10)

1. a Dan Ta double loop limestone-gypsum desulphurization system, be included in the one-level spray system (3), double loop dividing plate (5), secondary spray system (6) and the absorption tower outlet (9) that in absorption tower, set gradually from the bottom to top, it is characterized in that:
Described one-level spray system (3) comprising: slurries oxidation pond (1), lower circulated sprinkling layer (4) and lower circulating absorption tower entrance (11), described slurries oxidation pond (1), lower circulating absorption tower entrance (11) and lower circulated sprinkling layer (4) is set in turn in the bottom on absorption tower from the bottom to top, and described slurries oxidation pond (1) is connected by lower loop slurry circulating pump (2) with lower circulated sprinkling layer (4);
Described secondary spray system (6) comprising: cocycle spraying layer (7), cocycle absorption tower entrance (10), described cocycle absorption tower entrance (10) and cocycle spraying layer (7) are set in turn in the top of one-level spray system (3) in absorption tower from the bottom to top, and described cocycle spraying layer (7) is connected with the slurry circulation case (12) that is arranged at outside, absorption tower by cocycle slurry circulating pump (13);
Described double loop dividing plate (5) offers dividing plate perforate (510);
Slurries pH in described slurries oxidation pond (1) is 4.2-5.2, slurries pH >=6 in described slurry circulation case (12).
2. a kind of Dan Ta claimed in claim 1 double loop limestone-gypsum desulphurization system, it is characterized in that: on described double loop dividing plate (5), flow apron (520) is set, and is provided with two-grade desulfurizing loop slurry conduit (14) between double loop dividing plate (5) and slurry circulation case (12).
3. a kind of Dan Ta double loop limestone-gypsum desulphurization system described in claim 1-2 any one, is characterized in that: described double loop dividing plate (5) is connected employing arc (16) and connects with absorption tower wall.
4. a kind of Dan Ta claimed in claim 1 double loop limestone-gypsum desulphurization system, is characterized in that: between described secondary spray system (6) and slurry circulation case (12), be also provided with pressure-equalizing passageway (15).
5. a kind of Dan Ta double loop limestone-gypsum desulphurization system described in claim 1-4 any one, is characterized in that: between described secondary spray system (6) and absorption tower outlet (9), be also provided with demister (8).
6. a kind of Dan Ta double loop limestone-gypsum desulphurization system described in claim 1-5 any one, is characterized in that: described lower circulating absorption tower entrance (11) becomes arbitrarily angled with cocycle absorption tower entrance (10) on horizontal plane projecting direction.
7. a Dan Ta double loop Limestone-gypsum Wet Flue Gas Desulfurization Process method, is characterized in that, comprising:
1) export sulfur dioxide concentration requirement after obtaining the concentration of former sulfur dioxide in flue gas or flue gas desulfurization;
2) as the concentration > of former sulfur dioxide in flue gas 3200mg/Nm 3or after flue gas desulfurization, export the concentration requirement≤50mg/Nm of SO 2 from fume 3time, former flue gas enters absorption tower from lower circulating absorption tower entrance and contacts with the slurries of lower circulated sprinkling layer spray through one-level spray system, former flue gas continues to rise, enter secondary spray system by double loop dividing plate, contact with the slurries of cocycle spraying layer spray, the flue gas forming after desulfurization exports and discharges through absorption tower;
3) as the concentration≤3200mg/Nm of former sulfur dioxide in flue gas 3or after flue gas desulfurization, export the concentration requirement > 50mg/Nm of SO 2 from fume 3time, former flue gas enters absorption tower from cocycle absorption tower entrance and enters secondary spray system, contacts with the slurries of cocycle spraying layer spray, and the flue gas forming after desulfurization exports and discharges through absorption tower.
8. a kind of Dan Ta claimed in claim 7 double loop Limestone-gypsum Wet Flue Gas Desulfurization Process method, it is characterized in that, the slurries of described lower circulated sprinkling layer spray are that the slurries in slurries oxidation pond are delivered to lower circulated sprinkling layer by lower loop slurry circulating pump, and the slurries that the slurries of described cocycle spraying layer spray are slurry circulation case are delivered to cocycle spraying layer by cocycle slurry circulating pump.
9. a kind of Dan Ta double loop Limestone-gypsum Wet Flue Gas Desulfurization Process method described in claim 7-8 any one, it is characterized in that, described step 3) after the slurries of Central Plains flue gas and cocycle spraying layer spray contact, part slurries are transferred in slurry circulation case by double loop dividing plate collecting action, another part slurries enter slurries oxidation pond by double loop dividing plate, then are transported to slurry circulation case by delivery pump.
10. a kind of Dan Ta double loop Limestone-gypsum Wet Flue Gas Desulfurization Process method described in claim 7-9 any one, is characterized in that, the slurries pH in slurries oxidation pond is 4.2-5.2, slurries pH >=6 in slurry circulation case.
CN201410466865.7A 2014-09-15 2014-09-15 Single-tower double-loop limestone-gypsum wet-method desulfuration device and method Pending CN104174284A (en)

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CN105536494A (en) * 2015-12-30 2016-05-04 廖厚伍 Single-tower pH double-region double-circulation desulfurization process
CN107422763A (en) * 2017-05-03 2017-12-01 北京航天试验技术研究所 In a kind of propellant multiple step format and spray system and control method

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CN203577619U (en) * 2013-10-16 2014-05-07 四川君和环保工程有限公司 Absorption tower for desulfuration by using wet type calcium method
CN103736381A (en) * 2013-12-24 2014-04-23 航天环境工程有限公司 Dust removal device and dust removal method for sintering flue gas by shunted and graded desulfurization

Cited By (5)

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CN104959017A (en) * 2015-06-10 2015-10-07 浙江菲达环保科技股份有限公司 Porous partition spray equipped desulfurization tower
CN105214470A (en) * 2015-09-14 2016-01-06 江苏鲲鹏环保工程技术有限公司 The two slurry pool desulfurizer of single tower
CN105536494A (en) * 2015-12-30 2016-05-04 廖厚伍 Single-tower pH double-region double-circulation desulfurization process
CN107422763A (en) * 2017-05-03 2017-12-01 北京航天试验技术研究所 In a kind of propellant multiple step format and spray system and control method
CN107422763B (en) * 2017-05-03 2020-06-30 北京航天试验技术研究所 Propellant step-by-step neutralization spraying system and control method

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