CN104984656B - Multistage internal circulation semi-dry method desulfurization, denitrification and demercuration integrated device - Google Patents
Multistage internal circulation semi-dry method desulfurization, denitrification and demercuration integrated device Download PDFInfo
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- CN104984656B CN104984656B CN201510348272.5A CN201510348272A CN104984656B CN 104984656 B CN104984656 B CN 104984656B CN 201510348272 A CN201510348272 A CN 201510348272A CN 104984656 B CN104984656 B CN 104984656B
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Abstract
The invention provides a multistage internal circulation semi-dry method desulfurization, denitrification and demercuration integrated device and belongs to the field of smoke purification. The integrated device can remove sulfur, nitrate and mercury in smoke in a combined mode. A large Venturi tube is arranged at the lower portion of a first-stage internal circulation reactor, a small Venturi tube is arranged in the large Venturi tube, the large Venturi tube is communicated with an ash bucket, the ash bucket is communicated with a smoke inlet, and a ClO2 distributor is installed in the smoke inlet. A dual-alkali liquid atomizing nozzle is arranged in each stage of internal circulation reactor, each dual-alkali liquid atomizing nozzle is communicated with a container containing dual-alkali liquid through a slurry pump, a U-shaped groove separator is fixed to the top of each stage of internal circulation reactor, the Nth-stage internal circulation reactor is communicated with a smoke outlet, the smoke outlet is communicated with a bag-type dust remover, the bag-type dust remover is communicated with an induced draft fan, the bag-type dust remover is communicated with an ash storage tank and an ash bin through an ash discharge pipeline, a spiral feeder is arranged in the lower port of the ash storage tank, and an ash discharge port of the spiral feeder is communicated with the small Venturi tube through a discharge pipe. The integrated device is used for removing sulfur, nitrate and mercury in smoke.
Description
Technical field
The present invention relates to a kind of multistage interior circulation semi-dry desulfurization and denitrification mercury removal device.The invention belongs to gas cleaning neck
Domain.
Background technology
Coal is the main energy sources of China, the S0 that coal combustion is produced2、N0xAnd the heavy metal contaminants severe contamination such as Hg is big
Gas, wherein, S02, N0x be the main source to form the pollutions such as acid rain, photochemical fog, Hg has severe toxicity and is easy in vivo
Deposit and hysteresis is strong, seriously damage health, therefore, the S0 from flue gas is controlled on source2, NOx and Hg discharge
It is extremely urgent.
The Treatment process of flue gas is more, wherein comparative maturity and representative desulfurization technology have wet method, semidry method and
Dry method etc., low-temperature denitration technology has catalytic reduction method and oxidizing process etc., and demercuration technology has wet method and dry method etc..
The flue gas desulfurization and denitrification technology for researching and developing in the world at present can be divided into two major classes：One class is the combined classification of series connection
Removing sulfuldioxide, combines traditional flue gas desulfurization technique（FGD）, SCR technology（SCR）And sack cleaner dress
Put（Demercuration）, the S0 in flue gas is each independently removed respectively2, NOx and Hg, but this method equipment is complicated, floor space is big,
Technological operation requirement is high, purifies high cost, and removal effect for Hg is then with fuel ature of coal and the difference of flue gas condition, effect
Really widely different, activated coke consumption is big, is also easy to produce secondary pollution problem.Another kind of is same in whole system using a kind of technology
When remove S02, NOx and Hg, i.e. desulfurization denitration demercuration integrated technique.The method desulphurization and denitration, de- simultaneously in a system
Mercury, it is with the obvious advantage, system complexity reduction, with more preferable runnability, convenient management, small floor space and small investment,
Low cost, thus be the important directions of following air contaminant treatment and sustainable development.
Chinese invention patent 201320471845.X reports a kind of Industrial Boiler flue gas combined desulfurization and denitration mercury removal device,
It is that one kind utilizes ozone（03）With calcium-base absorbing agent as depleting agents, using recirculating fluidized bed as fundamental system, to Industrial Boiler
Sulfur dioxide in flue gas（SO2）, nitrogen oxides（NOX）And mercury（Hg）The Industrial Boiler of joint removing is carried out Deng multiple pollutant
Flue gas combined desulfurization and denitration mercury removal device, it include ozone generating-device, recirculating fluidized bed absorption tower, calcium-base absorbing agent warehouse,
Cyclone separator, sack cleaner and chimney.The device can effective desulfurization denitration demercuration, but it has the disadvantage complex structure,
Cyclone separator resistance is big, and ozone generating-device power consumption is huge to be difficult to carry out（For example, the exhaust gas volumn that 20t/h boilers are produced need to match somebody with somebody
Power is the ozone generator of 110KW, and power consumption is huge, less economical）, greatly, construction cost is high, and operating cost is high for floor space.
Therefore, in order to solve the above technical problems, being necessary to provide a kind of with structure improved flue gas combined desulfurization and denitration
Mercury removal device, to overcome the defect of the prior art.
The content of the invention
Taken off it is an object of the invention to provide a kind of multistage interior circulation semidry method that can combine sulphur, nitre and mercury in removing flue gas
Sulphur denitration demercuration integrated apparatus.
Device of the invention is using double alkali lye（Ca(OH)2、NaOH）As absorbent, by ClO2The dioxy that generator is produced
Change chlorine（ClO2）As strong oxidizer, using inner circulation reactor as fundamental system, to the sulfur dioxide in flue gas（SO2）, nitrogen oxygen
Compound（NOX）And mercury（Hg）Joint removing is carried out Deng multiple pollutant.The side of the bottom of device sets smoke inlet, device
Top side set exhanst gas outlet, make flue gas from bottom to top by multistage inner circulation reactor.
Above-mentioned purpose is realized, the technical scheme is that：
In multistage interior circulation semi-dry desulfurization and denitrification demercuration integrated apparatus, including gas approach, small Venturi tube, multistage
Recirculation reactor, exhanst gas outlet, multiple double alkali lye atomizers, ash bucket, ClO2Distributor, slurries pump, it is loaded with double alkali lye
Container, multiple U-type groove separators, sack cleaner, air-introduced machine, bulk cement storage tank, screw(-type) feeder, tremie pipe and ash silo；
The multistage inner circulation reactor is vertically arranged, and the multistage inner circulation reactor is followed successively by the first order from the bottom to top
To N grades of inner circulation reactor, N is natural number to inner circulation reactor, and N=3 ~ 5；Under the first order inner circulation reactor
Portion is big Venturi tube, and the big Venturi tube is made up of contraction section, trunnion and diffuser successively from the bottom to top.Big Venturi tube
It is interior that small Venturi tube, the lower port of the big Venturi tube and the upper end of ash bucket are vertically arranged between trunnion and diffuser
Mouth is connected, and the lower port of the ash bucket is ash discharging hole, and the side wall of ash bucket is connected with gas approach, is provided with gas approach
ClO2Distributor, the ClO2Several ClO of distributor2Nozzle spray direction is identical with flue gas flow direction, in ClO2After distributor
Big venturi tube inlet section arrangement horizontally-guided plate, in big Venturi tube contraction section lower disposed vertically-guided plate；In big text
Venturi trunnion entrance arranges flow straightening grid；Bottom in every one-level inner circulation reactor of multistage inner circulation reactor is all provided with
A double alkali lye atomizer is equipped with, and is arranged on the double alkali lye atomizers in first order inner circulation reactor and be located at big text mound
In pipe diffuser in, all of pair of alkali lye atomizer is respectively positioned on the center line of multistage internal circulation apparatus and sets upward,
The outlet of all of pair of entrance of alkali lye atomizer with slurries pump is connected, the import of the slurries pump be loaded with double alkali
The container of liquid is connected, and U-type groove separator, N grades of interior circulation reaction are respectively and fixedly provided with per the top in one-level inner circulation reactor
The upper port of device is connected with exhanst gas outlet, and the exhanst gas outlet is connected with the entrance of sack cleaner by the road, the cloth
The outlet of bag dust collector is connected with the entrance of air-introduced machine by the road, and the ash discharging hole of sack cleaner lower end is by ash discharge pipeline point
It is not connected with the upper port and ash silo of bulk cement storage tank, screw(-type) feeder, the spiral is provided with the lower port of the bulk cement storage tank
The ash discharging hole of batcher is connected by tremie pipe with the trunnion of small Venturi tube.
The present invention is relative to the beneficial effect of prior art：
1st, simple structure, reaction efficiency are high, and causing that absorbent fully reacts with flue gas using multistage inner circulation reactor connects
Touch, using Ca (OH)2The double alkali lye of+NaOH and strong oxidizer ClO2, can effectively desulphurization and denitration, demercuration, desulfuration efficiency reaches 90%,
Denitration, demercuration efficiency reach more than 80%, and removal efficiency is high, and effectively reduce floor space, reduce operating cost.
2nd, the present invention is realized to sulfur dioxide in flue gas（SO2）, nitrogen oxides（NOX）And mercury（Hg）Deng multiple pollutant
Joint removing, using double alkali lye and ClO2Synergy, realizes desulphurization and denitration and demercuration simultaneously, improves atmosphere pollution and controls
Reason effect, has reached newest environment protection emission requirement.
3rd, using multistage inner circulation reactor, SR is small（Resistance is less than or equal to 1500Pa）, save electric power.
4th, horizontally-guided plate, vertically-guided plate and flow straightening grid are applied in combination, and effectively solve prior art and do not solve always
Bias current problem.
5th, the present invention solves the problems, such as that single-stage injection causes flue gas overly moist using double alkali lye multi-stage jets；So that per one-level
Inner circulation reactor is relatively independent, has new alkali lye to participate in desulphurization and denitration, and overall desulfurization, denitration efficiency are high；
6th, from the second level, per one-level inner circulation reactor bottom aditus laryngis（That is lower port）Speed is high（10~12m/s）, in
Portion's speed is 4 ~ 5m/s, top uses vertical U-type groove separator, and this structure design causes big in every one-level inner circulation reactor
The amount strong interior circulation of material, not only improves desulphurization and denitration efficiency, and solve per fouling problem in one-level inner circulation reactor.
7th, the grey recirculation structure of sack cleaner trapping is unique, and circulating ash enters multistage interior circulation reaction from small Venturi tube
Device, returns ash and is evenly distributed in multistage inner circulation reactor, solves prior art and enters from reactor rear wall, causes feed back along anti-
Answer uneven in device short transverse, influence the problem of desulfurized effect.
Brief description of the drawings
Fig. 1 is overall structure front view of the invention；
Fig. 2 is the K-K sectional views in Fig. 1；
Fig. 3 is the M-M sectional views in Fig. 1；
Fig. 4 is partial enlarged drawing at the A of Fig. 1；
Fig. 5 is partial enlarged drawing at the B of Fig. 1.
Fig. 6 is conical shell main sectional view；
Fig. 7 is the top view of Fig. 6；
Fig. 8 is partial enlarged drawing at the C of Fig. 6.
In figure：Gas approach 1, small Venturi tube 2, multistage inner circulation reactor 3, exhanst gas outlet 4, double alkali lye atomizers
5th, ash bucket 6, ClO2Distributor 7, slurries pump 8, the container 9 for being loaded with double alkali lye, U-type groove separator 10, sack cleaner 11, draw
Blower fan 12, bulk cement storage tank 13, screw(-type) feeder 14, tremie pipe 15, ash silo 16, big Venturi tube 17, ash discharging hole 18, chimney 19, circle
Conical shell 20, passage 21, annular outer 22, U-type groove body 23, horizontally-guided plate 24, vertically-guided plate 25, smoke deflector
26th, flow straightening grid 27, flase floor 28 and ClO2Generator 29.
Specific embodiment
Specific embodiment one：As shown in Fig. 1 ~ Fig. 8, multistage interior circulation semi-dry desulfurization and denitrification demercuration integrated apparatus,
Including gas approach 1, small Venturi tube 2, multistage inner circulation reactor 3, exhanst gas outlet 4, multiple double alkali lye atomizers 5, ash
Bucket 6, ClO2Distributor 7, slurries pump 8, the container 9 for being loaded with double alkali lye, multiple U-type groove separators 10, sack cleaner 11, draw
Blower fan 12, bulk cement storage tank 13, screw(-type) feeder 14, tremie pipe 15 and ash silo 16；
The multistage inner circulation reactor 3 is vertically arranged, and the multistage inner circulation reactor 3 is followed successively by first from the bottom to top
To N grades of inner circulation reactor, N is natural number to level inner circulation reactor, and N=3 ~ 5；The first order inner circulation reactor
Bottom is big Venturi tube 17, and the big Venturi tube 17 is made up of contraction section, trunnion and diffuser successively from the bottom to top.Big text
It is located in venturi 17 and small Venturi tube 2 is vertically arranged between trunnion and diffuser（The planform of small Venturi tube 2 with
Big Venturi tube 17 is similar）, the lower port of the big Venturi tube 17 is connected with the upper port of ash bucket 6, under the ash bucket 6
Port is ash discharging hole 18, and the side wall of ash bucket 6 is connected with gas approach 1（Gas approach 1 is connected with boiler exhaust gas road）, flue gas
ClO is installed in import 12Distributor 7, the ClO2Several ClO of distributor 72Nozzle spray direction is identical with flue gas flow direction,
In ClO2The entrance of big Venturi tube 17 arrangement horizontally-guided plate 24 after distributor 7, under the contraction section of big Venturi tube 17
Portion arranges vertically-guided plate 25（The vertically-guided plate 25 matches with horizontally-guided plate 24）；Enter in the trunnion of big Venturi tube 17
Mouth section arrangement flow straightening grid 27；Bottom in every one-level inner circulation reactor of multistage inner circulation reactor 3 is provided with one
Double alkali lye atomizers 5, and the double alkali lye atomizers 5 in first order inner circulation reactor are arranged on positioned at big Venturi tube 17
Diffuser in（Mixed as early as possible with droplet with strengthening flue gas）, all of pair of alkali lye atomizer 5 be respectively positioned on multistage interior circulation dress
Put on 3 center line and set upward, the outlet of all of pair of entrance of alkali lye atomizer 5 with slurries pump 8 is connected, institute
The import for stating slurries pump 8 is connected with the container 9 for being loaded with double alkali lye, is respectively and fixedly provided with per the top in one-level inner circulation reactor
U-type groove separator 10（Vertical）, the N grades of upper port of inner circulation reactor be connected with exhanst gas outlet 4, and the flue gas goes out
Mouthful 4 entrance by the road with sack cleaner 11 is connected, the outlet of the sack cleaner 11 by the road with air-introduced machine 12
Entrance is connected（The outlet of the air-introduced machine 12 is connected by pipeline with chimney 19）, the ash discharging hole of the lower end of sack cleaner 11
It is connected with the upper port and ash silo 16 of bulk cement storage tank 13 respectively by ash discharge pipeline, is provided with the lower port of the bulk cement storage tank 13
Screw(-type) feeder 14, the ash discharging hole of the screw(-type) feeder 14 is connected by tremie pipe 15 with the trunnion of small Venturi tube 2.
The desulfurizing agent and ash content that U-type groove separator at the top of every grade of inner circulation reactor is isolated return to each interior circulation
Interior circulation is formed in reactor, promotes the reaction of flue gas and absorbent, improve the removal efficiency of flue gas pollutant.
Circle is per the cross section of one-level inner circulation reactor, and lower port and upper port cross section are respectively less than interlude
Cross section.
The many presence in the form of NO of the harmful substance in NOx in flue gas, by ClO2It is oxidized to NO2, Hg is oxidized to it is readily soluble
In the Hg of water2+Generation HgCl2,And removed in follow-up sack cleaner 11；Using semi-dry desulphurization technology, by flue gas
S02、NO2With the NaOH+Ca (OH) in double alkali lye atomizers 52There is acid-base neutralization reaction removing S0 in the aqueous solution2、NO2, can
Concentration according to pollutant in flue gas determines to spray solution alkali concn and alkali lye amount.
Specific embodiment two：As shown in Figure 1, Figure 2, shown in Fig. 4, Fig. 6 ~ Fig. 8, multistage interior circulation described in specific embodiment one
Semi-dry desulfurization and denitrification demercuration integrated apparatus, described each U-type groove separator 10 includes Multi-layer U-shape groove, the conical shell
Several passages 21 are machined with the side wall of body 20, the larger diameter end of conical shell 20 is provided with an annular outer 22, circular cone
The outside of shape housing 20 is provided with Multi-layer U-shape groove from the inside to the outside, and the lower end of nexine U-type groove is fixed with annular outer 22 upper surface
Connection, is machined with opening with nexine U-type groove opposite position on annular outer 22, described per in one-level inner circulation reactor
Upper end of the top with Multi-layer U-shape groove is fixedly connected, and every layer of U-type groove includes multiple U-type groove bodies 23, every layer of U-type groove it is many
Individual U-type groove body 23 is located on same circumference and is uniformly arranged, and the equal stagger arrangement of multiple U-type groove bodies 23 of every adjacent two layers U-type groove sets
Put, and the side wall of the notch multistage inner circulation reactor 3 of direction of all U-type groove bodies 23 is set, every grade of inner circulation reactor top
Passage 21 on the exit conical shape housing 20 in portion, its a diameter of 5 ~ 6mm prevents dust accretions and sets, and so sets
Putting can be such that dust stratification is back to along slope to participate in desulphurization reaction in desulfurizing tower.It is preferred that using inside and outside two layers U-type groove.
The beneficial effect of present embodiment is：This structure design causes that a large amount of materials are strong in every one-level inner circulation reactor
Strong interior circulation, not only improves desulphurization and denitration efficiency, and solve per fouling problem in one-level inner circulation reactor.
Specific embodiment three：As shown in figure 1, multistage interior circulation semi-dry desulphurization takes off described in specific embodiment one or two
Nitre demercuration integrated apparatus, the multistage interior circulation semi-dry desulfurization and denitrification demercuration integrated apparatus also include at least one level
Guide plate 24；At least one horizontally-guided plate 24 is arranged on inside smoke inlet 1 parallel to the center line of smoke inlet 1, institute
Some horizontally-guided plates 24 are fixedly connected with the madial wall of smoke inlet 1（Setting the purpose of horizontally-guided plate 24 is：For dividing equally
Flue gas, flue gas by after horizontally-guided plate 24, to being delivered in big Venturi tube 17, fraction solids particulate matter gravity and from
Fallen into the presence of heart inertia force in ash bucket 6, and ash discharging hole 18 through ash bucket 6 is discharged）.
Specific embodiment four：As shown in figure 1, multistage interior circulation semi-dry desulfurization and denitrification takes off described in specific embodiment three
Mercury integrated apparatus, the multistage interior circulation semi-dry desulfurization and denitrification demercuration integrated apparatus also include at least one vertically-guided
Plate 25；At least one vertically-guided plate 25 is arranged in ash bucket 6, and all of vertically-guided plate 25 is interior with ash bucket 6
Side wall is fixedly connected.
Specific embodiment five：As shown in figure 1, multistage interior circulation semi-dry desulfurization and denitrification takes off described in specific embodiment one
Mercury integrated apparatus, the multistage interior circulation semi-dry desulfurization and denitrification demercuration integrated apparatus also include smoke deflector 26；Institute
State exhanst gas outlet 4 with multistage inner circulation reactor 3 at an angle of 90, the turning of square exhanst gas outlet is circular shape, square cigarette
Smoke deflector 26 is provided with center line in gas outlet, the smoke deflector 26 is consolidated with square exhanst gas outlet madial wall
Fixed connection（So that the flue gas discharged through exhanst gas outlet 4 is in draining into sack cleaner 11）.
Specific embodiment six：As shown in Figures 1 and 3, multistage interior circulation semi-dry desulphurization described in specific embodiment four
Denitration demercuration integrated apparatus, the multistage interior circulation semi-dry desulfurization and denitrification demercuration integrated apparatus also include flow straightening grid
27, the flow straightening grid 27 includes multiple flase floors 28；The flow straightening grid 27 is fixedly installed on the trunnion of big Venturi tube 17
It is interior.
The beneficial effect of present embodiment is：Horizontally-guided plate, vertically-guided plate and flow straightening grid are applied in combination, effectively solution
Certainly prior art unsolved bias current problem always.
Job step of the invention is：As shown in Fig. 1 ~ Fig. 8；
Step one, boiler smoke enters in smoke inlet 1, elder generation and ClO2The ClO that generator 29 is produced2Uniform mixing, through water
Flat guide plate 24 and vertically-guided plate 25 are led back into big Venturi tube 17, elder generation and ClO in big Venturi tube 172Nozzle
The ClO of penetrating2There is oxidation reaction, part SO in mixing2It is oxidized to SO3, the NO in flue gas is oxidized to NO2, Hg is oxidized to Hg2+,
And further reacted with double alkali liquor absorption agent in the diffuser of big Venturi tube 17（Double alkali lye are by double alkali lye atomizers 5
Accelerated flow of flue gas section is sprayed to, for accelerating the SO in absorbent and flue gas2And NO2Deng the reaction of sour gas）, cloth
Bag dust collector 11 enters the circulating ash of bulk cement storage tank 13, by the ash discharging hole of screw(-type) feeder 14 through tremie pipe 15 by small Venturi tube
2 accelerate to spray into multistage inner circulation reactor 3, and flue gas fully reacts with absorbent in multistage inner circulation reactor 3, in flue gas
Partial particulate thing sphere formed under the conditions of mist projection granulating fallen into ash bucket 6 through the aditus laryngis of big venturi 17, through ash discharging hole
18 discharges；
Step 2, sack cleaner 11 is entered after flue gas and absorbent reaction through the smoke deflector 26 in exhanst gas outlet 4
In.
The course of work of the invention is：As shown in Fig. 1 ~ Fig. 8, the flue gas from boiler initially enters device of the invention
In gas approach 1, by ClO2The oxidant ClO that generator is produced2Gas is by ClO2Distributor 7 is uniformly sprayed into gas approach 1,
By the part SO in flue gas2It is oxidized to SO3, NO is oxidized to NO2, Hg be oxidized to Hg2+, flue gas is by horizontally-guided plate 24 and hangs down
Straight guide plate 25 enters intraoral, the setting flow straightening grid 27 in the trunnion of big Venturi tube 17 so that cigarette into big Venturi tube 17
Gas does not produce segregation uniformly through big Venturi tube 17, and double alkali lye are sprayed into every one-level by all of pair of alkali lye atomizer 5
In the bottom flue gas of recirculation reactor, the described pair of alkali lye be by mass percent concentration for 15% ~ 25% Ca (OH)2With quality hundred
Specific concentration is divided to be constituted for 0.1% ~ 0.5% NaOH（Purpose is strengthened to SO2Removing, it is ensured that 90% desulfuration efficiency）, double alkali lye
It is atomized by compressed air.
By taking three-level inner circulation reactor as an example：It is arranged on the double alkali lye atomizers 5 in the diffuser of big Venturi tube 17
Straying quatity accounts for the 50% of double alkali lye total amounts（Alkali lye amount in spraying into flue gas under rated load accounts for the 50% of total amount, similarly hereinafter）If,
Double straying quatities of alkali lye atomizer 5 of bottom in the inner circulation reactor of the second level account for double alkali lye total amounts 30% is put, the is arranged on
Double straying quatities of alkali lye atomizer 5 of bottom account for the 20% of double alkali lye total amounts in three-level inner circulation reactor, and it is to ensure so to set
The slurries of penetrating are in every one-level inner circulation reactor outlet all evaporations, it is to avoid single-stage slurries are sprayed into excessively causes slurries complete
Pervaporation and trickled along reactor wall, cause wall serious scale, influence safe and stable operation.In order to ensure follow-up cloth
Do not condensed in bag dust collector 11, the flue-gas temperature at the exhanst gas outlet 4 of the multistage inner circulation reactor 3 of control is at 85 ~ 100 DEG C.
Lime white (the Ca (OH) of atomization2And water) and NaOH solution be converted under the heating of flue gas steam and wet granular with
Flue gas uniformly mixes, and neutralization reaction, the SO in removing flue gas occur2、NO2.Flue gas carries desulfurizing agent（Ca(OH)2、NaOH）With
Flue dust is separated by U-type groove separator 10 in every one-level inner circulation reactor top exit major part and returns to this grade of interior circulation
Interior circulation is formed in reactor, the time of contact of flue gas and desulfurizing agent is increased, mixing of the flue gas with desulfurizing agent and rapids is strengthened
It is dynamic, the retaining amount in every one-level inner circulation reactor is improve, reactant concentration is increased, improve Ca/S mol ratios so that reaction
Speed is largely increased；From the second level, the cigarette speed of arrival end and the port of export per one-level inner circulation reactor is controlled
It is 4 ~ 5m/s per the cigarette speed in the middle part of one-level inner circulation reactor between 10 ~ 12m/s.The port of export of first order inner circulation reactor
It is exactly the arrival end of second level inner circulation reactor, second level inner circulation reactor repeats the reaction of first order inner circulation reactor
Process, third level inner circulation reactor repeats first, second grade of course of reaction of inner circulation reactor, and flue gas is from multistage afterwards
The exhanst gas outlet 4 at the top of recirculation reactor 3 enters in sack cleaner 11, and the part ash under being separated through sack cleaner 11 is returned
Bulk cement storage tank 13 is returned to, by simultaneously screw(-type) feeder 14（It is prior art）And tremie pipe 15 is back in small Venturi tube 2, formed
Ash circulation, improves desulfuration efficiency, to reduce the usage amount of lime white, in Ca/S=1.2 ~ 1.5；90% SO can be sloughed2With 80% with
On NO and Hg.
Reaction principle：
1、ClO2Gas comes to ClO2Generator and NO, SO2, Hg reaction equations it is as follows：
5NO + 2ClO2 + H2O = 2HCl + 5NO2
5NO2 + ClO2+ 3H2O = HCl + 5HNO3
SO2 + 2ClO2 + H2O = SO3 + 2HCl +2O2
2HCl + Ca(OH)2 = CaCl2 + 2H2O
2HNO3 + Ca(OH)2 = Ca(NO3)2 + 2H2O
Hg + 2ClO2 = HgCl2 + 2O2
SO3 + Ca(OH)2 = CaSO4 + H2O
NaOH + HCl = NaCl + H2O
NaOH + HNO3 = NaNO3 + H2O
2NaOH+ SO3 = Na2SO4 + H2O
2、Ca(OH)2, NaOH and SO2Reaction equation：
Ca(OH)2 + SO2 = CaSO3·1/2H2O +1/2H2O
CaSO3 + 1/2O2 = CaSO4
2NaOH + SO2 = Na2SO3 + H2O
2Na2SO3 + O2 = 2Na2SO4
Specific embodiment above is only first embodiment of the invention, is not intended to limit the invention, all in this hair
Any modification, equivalent substitution and improvements done within bright spirit and principle etc., should be included in this creation protection domain it
It is interior.
Claims (6)
1. a kind of multistage interior circulation semi-dry desulfurization and denitrification demercuration integrated apparatus, including gas approach（1）, small Venturi tube
（2）, multistage inner circulation reactor（3）, exhanst gas outlet（4）, multiple double alkali lye atomizers（5）, ash bucket（6）、ClO2Distributor
（7）, slurries pump（8）, be loaded with the container of double alkali lye（9）, multiple U-type groove separators（10）, sack cleaner（11）, air-introduced machine
（12）, bulk cement storage tank（13）, screw(-type) feeder（14）, tremie pipe（15）And ash silo（16）；
It is characterized in that：The multistage inner circulation reactor（3）It is vertically arranged, the multistage inner circulation reactor（3）From the bottom to top
It is followed successively by first order inner circulation reactor to N grades of inner circulation reactor, N is natural number, and N=3 ~ 5；Followed in the first order
The bottom of loop reactor is big Venturi tube（17）, the big Venturi tube（17）From the bottom to top successively by contraction section, trunnion and
Diffuser is constituted；Big Venturi tube（17）It is interior that small Venturi tube is vertically arranged between trunnion and diffuser（2）, it is described big
Venturi tube（17）Lower port and ash bucket（6）Upper port be connected, the ash bucket（6）Lower port be ash discharging hole（18）,
Ash bucket（6）Side wall and gas approach（1）It is connected, gas approach（1）ClO is inside installed2Distributor（7）, the ClO2Distribution
Device（7）Several ClO2Nozzle spray direction is identical with flue gas flow direction, in ClO2Distributor（7）Big Venturi tube afterwards（17）
Entrance arranges horizontally-guided plate（24）, in big Venturi tube（17）Contraction section lower disposed vertically-guided plate（25）；In big text
Venturi（17）Trunnion entrance arranges flow straightening grid（27）；Multistage inner circulation reactor（3）Every one-level inner circulation reactor
Interior bottom is provided with a double alkali lye atomizer（5）, and it is arranged on the double alkali lye mists in first order inner circulation reactor
Change nozzle（5）Positioned at big Venturi tube（17）Diffuser in, all of pair of alkali lye atomizer（5）It is respectively positioned on multistage interior circulation
Reactor（3）Center line on and set upward, all of pair of alkali lye atomizer（5）Entrance with slurries pump（8）Go out
Mouth is connected, the slurries pump（8）Import and be loaded with the container of double alkali lye（9）It is connected, per one-level inner circulation reactor
Interior top is respectively and fixedly provided with U-type groove separator（10）, the upper port and exhanst gas outlet of N grades of inner circulation reactor（4）It is connected,
The exhanst gas outlet（4）By the road with sack cleaner（11）Entrance be connected, the sack cleaner（11）Outlet warp
Pipeline and air-introduced machine（12）Entrance be connected, sack cleaner（11）The ash discharging hole of lower end is grey with storage respectively by ash discharge pipeline
Tank（13）Upper port and ash silo（16）It is connected, the bulk cement storage tank（13）Lower port at be provided with screw(-type) feeder（14）,
The screw(-type) feeder（14）Ash discharging hole pass through tremie pipe（15）With small Venturi tube（2）Trunnion be connected.
2. multistage interior circulation semi-dry desulfurization and denitrification demercuration integrated apparatus according to claim 1, it is characterized in that：It is described every
Individual U-type groove separator（10）Include conical shell（20）And Multi-layer U-shape groove, the conical shell（20）Side wall on
It is machined with several passages（21）, conical shell（20）Larger diameter end be provided with an annular outer（22）, conical shell
（20）Outside be provided with Multi-layer U-shape groove from the inside to the outside, and the lower end of nexine U-type groove and annular outer（22）Upper surface is fixed and is connected
Connect, annular outer（22）Upper and nexine U-type groove opposite position is machined with opening, described per in one-level inner circulation reactor
Upper end of the top with Multi-layer U-shape groove is fixedly connected, and every layer of U-type groove includes multiple U-type groove bodies（23）, every layer of U-type groove
Multiple U-type groove bodies（23）On same circumference and it is uniformly arranged, and per multiple U-type groove bodies of adjacent two layers U-type groove（23）
Stagger arrangement is set, and all U-type groove bodies（23）Notch towards multistage inner circulation reactor（3）Side wall set.
3. multistage interior circulation semi-dry desulfurization and denitrification demercuration integrated apparatus according to claim 1 or claim 2, it is characterized in that：Institute
Stating multistage interior circulation semi-dry desulfurization and denitrification demercuration integrated apparatus also includes at least one horizontally-guided plate（24）；It is described at least
One horizontally-guided plate（24）Parallel to gas approach（1）Center line is arranged on gas approach（1）Inside, all of horizontally-guided
Plate（24）And gas approach（1）Madial wall is fixedly connected.
4. multistage interior circulation semi-dry desulfurization and denitrification demercuration integrated apparatus according to claim 3, it is characterized in that：It is described many
Level interior circulation semi-dry desulfurization and denitrification demercuration integrated apparatus also include at least one vertically-guided plate（25）；Described at least one
Vertically-guided plate（25）It is arranged on ash bucket（6）It is interior, and all of vertically-guided plate（25）And ash bucket（6）Madial wall fix connect
Connect.
5. multistage interior circulation semi-dry desulfurization and denitrification demercuration integrated apparatus according to claim 1, it is characterized in that：It is described many
Level interior circulation semi-dry desulfurization and denitrification demercuration integrated apparatus also include smoke deflector（26）；The exhanst gas outlet（4）With it is many
Level inner circulation reactor（3）At an angle of 90, the turning of square exhanst gas outlet be circular shape, in square exhanst gas outlet in
Smoke deflector is provided with heart line（26）, the smoke deflector（26）It is fixedly connected with square exhanst gas outlet madial wall.
6. multistage interior circulation semi-dry desulfurization and denitrification demercuration integrated apparatus according to claim 4, it is characterized in that：It is described many
Level interior circulation semi-dry desulfurization and denitrification demercuration integrated apparatus also include flow straightening grid（27）, the flow straightening grid（27）Including many
Individual flase floor（28）；The flow straightening grid（27）It is fixedly installed on big Venturi tube（17）Trunnion in.
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| CN108159857A (en) * | 2017-12-15 | 2018-06-15 | 商春礼 | A kind of double alkali semi-dry flue gas desulfurization devices of double tower and method |
| CN109482047A (en) * | 2018-11-27 | 2019-03-19 | 杭州宁骏科技有限公司 | A kind of semi-dry desulphurization system |
| CN110404392A (en) * | 2019-08-25 | 2019-11-05 | 湖北强达环保科技股份有限公司 | A kind of multistage atomizing semidry process desulfurizer and method |
| CN110548387A (en) * | 2019-09-23 | 2019-12-10 | 上海蓝科石化环保科技股份有限公司 | integrated treatment device and process for ion denitration, desulfurization and dust removal by semidry method |
| CN114028925A (en) * | 2021-05-27 | 2022-02-11 | 苏州仕净环保科技股份有限公司 | Desulfurization and denitrification agent for flue gas and desulfurization and denitrification method and device thereof |
| CN114011216A (en) * | 2021-11-02 | 2022-02-08 | 山鹰国际控股股份公司 | CFB semi-dry desulfurization system |
| CN115121109A (en) * | 2022-07-20 | 2022-09-30 | 天津水泥工业设计研究院有限公司 | Low NO X System and process for denitration of flue gas and auxiliary desulfurization treatment of escaping ammonia |
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| CN100366325C (en) * | 2006-05-29 | 2008-02-06 | 浙江大学 | Wet method combined process for desulfurization and denitration for chlorine-containing strong oxidizer absorption liquid |
| CN101891341A (en) * | 2010-07-01 | 2010-11-24 | 江南大学 | Anaerobic reactor with three-phase separators at upper and lower layers and method for landfill leachate treatment |
| WO2013053109A1 (en) * | 2011-10-12 | 2013-04-18 | Xiong Liang | Process and equipment for eliminating oxynitride, oxysulfide and mercury from exhaust gas through oxidization |
| CN203342648U (en) * | 2013-06-19 | 2013-12-18 | 北京博朗环境工程技术股份有限公司 | Circulating fluid bed reactor realizing single-pipe internal circulating of absorbent and simultaneous desulfuration and denitration of smoke |
| CN203447967U (en) * | 2013-08-05 | 2014-02-26 | 河北环科力创环境工程有限公司 | Combined smoke desulfuration, denitration and demercuration device of industrial boiler |
| CN103990362A (en) * | 2014-05-16 | 2014-08-20 | 山东大学 | Method and device for removing sulfur, nitre and mercury in smoke |
| CN103977702B (en) * | 2014-05-16 | 2016-01-27 | 南京师范大学 | A kind of circulating fluid bed flue-gas desulfurizing denitration demercuration integrated apparatus and method |
| CN104107627A (en) * | 2014-07-21 | 2014-10-22 | 中国科学院过程工程研究所 | Device and method for cooperative desulfurization, denitration, demercuration and dioxin removal of sintering flue gas by virtue of circulating fluidized bed semidry method |
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