CN109999654A - The integration removing system and method for multi-pollutant in a kind of coal-fired flue-gas - Google Patents
The integration removing system and method for multi-pollutant in a kind of coal-fired flue-gas Download PDFInfo
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- CN109999654A CN109999654A CN201910332298.9A CN201910332298A CN109999654A CN 109999654 A CN109999654 A CN 109999654A CN 201910332298 A CN201910332298 A CN 201910332298A CN 109999654 A CN109999654 A CN 109999654A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/508—Sulfur oxides by treating the gases with solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention discloses a kind of integration removing system and methods of multi-pollutant in coal-fired flue-gas, the system includes concatenated preposition deduster, recirculating fluidized bed and postposition deduster, ammonia-spraying grid is provided in flue, the first filter membrane of attachment denitrating catalyst is provided in preposition deduster, sorbent particle is provided in recirculating fluidized bed, the second filter membrane is provided in postposition deduster, material recycling device on the ash discharging hole of postposition deduster is connect with recirculating fluidized bed, and postposition deduster is connect with chimney；This method comprises: spraying into ammonia into coal-fired flue-gas by the ammonia-spraying grid in flue, dust and nitrogen oxides are removed simultaneously using preposition deduster, dry desulfurization is then carried out, the sorbent particle and recycling that flue gas is taken out of is collected using postposition deduster, finally flue gas is discharged.The present invention, which can be realized, carries out integrated removing to the multi-pollutant in flue gas, has that removal effect is good, occupies little space and the outstanding advantages such as implementation cost is low.
Description
Technical field
The present invention relates to coal-fired flue-gas processing technology fields, and more specifically, the present invention is mostly dirty in a kind of coal-fired flue-gas
Contaminate the integration removing system and method for object.
Background technique
Sulfur dioxide not only can directly cause damages to ecological environment, but also be the key that the pollutions such as acid rain, gray haze are formed
Precursor；The combustion of fossil fuel such as coal are the main reason for sulfur dioxide generate, it is achieved that coal-fired flue gas desulfurization is very crucial.
Currently, Limestone-gypsum Wet Flue Gas Desulfurization Process is at this stage with widest flue gas desulfurization technique, although this method can actually
Realize that desulfurization still brings the secondary pollutions problem such as desulfurization wastewater, high-temperature flue gas, corrosion or fouling, secondary pollution problem
Become new environmental problem, the prior art is difficult to thoroughly solve the problems, such as secondary pollution, and secondary pollution governance process needs
A large amount of capital investment.In addition, the pollutant in coal-fired flue-gas not only includes sulfur dioxide, but also including NOXAnd dust, but
It is that existing multi-pollutant removing system often has that system is excessively complicated, occupied area is excessive, easily induces secondary pollution, throws
Provide the problems such as cost is excessively high and maintenance cost is excessively high.
Therefore, how under the premise of avoiding secondary pollution realize in coal-fired flue-gas pollutant carry out it is efficient, low at
Local removing, the emphasis for becoming those skilled in the art's technical problem urgently to be resolved and studying always.
Summary of the invention
To solve easily to induce secondary pollution, removing system mistake existing for the pollutant removing scheme in existing coal-fired flue-gas
In the complicated, higher cost the problems such as, the present invention innovatively provides a kind of integration removing system of multi-pollutant in coal-fired flue-gas
System and method, improved deduster is combined with recirculating fluidized bed, under the premise of avoiding generating secondary pollution, the present invention
It can be realized while denitration and dedusting, and Dry denitration process can be completed and not used desulfurizing agent is effectively returned
It receives, the present invention integrally realizes dirt nitre sulphur integration removing, to thoroughly solve the pollutant removing in existing coal-fired flue-gas
Problems existing for scheme.
To realize the above-mentioned technical purpose, the invention discloses a kind of integration removing systems of multi-pollutant in coal-fired flue-gas
System, the integration removing system includes flue, preposition deduster, recirculating fluidized bed and postposition deduster；The flue both ends
It is separately connected the exhaust outlet of boiler and the air inlet of preposition deduster, is provided with ammonia-spraying grid in the flue, it is described preposition to remove
It is provided with the first filter membrane in dirt device, is attached with denitrating catalyst on first filter membrane；The gas outlet of preposition deduster with
The air inlet of recirculating fluidized bed connects, and is provided with sorbent particle in the recirculating fluidized bed；The gas outlet of recirculating fluidized bed with
The air inlet of postposition deduster connects, and is provided with the second filter membrane in the postposition deduster, on the ash discharging hole of postposition deduster
It is provided with material recycling device, the feedback outlet of material recycling device and the material-feeding port of recirculating fluidized bed connect；Postposition deduster
Gas outlet is connect with chimney.
Based on above-mentioned technical solution, by the design of preposition deduster, the present invention can be realized denitrification process and dedusting
The organic coupling of process reaches the dual purpose of catalysis and filtering, and passes through the design of postposition deduster and recirculating fluidized bed,
The present invention, which can also realize the recycling of desulfurizing agent and make flue gas and desulfurizing agent that chemistry occur by way of dry desulfurization, to inhale
Reaction enclosure, to be finally reached the purpose of multi-pollutant integration removing.
Further, the integrated removing system further includes the first province being series between the boiler and the flue
Coal device, first economizer are used to control the temperature for flowing into the coal-fired flue-gas in the flue and are in mesophilic range；Its
In, the mesophilic range is 250 DEG C~450 DEG C.
Based on above-mentioned improved technical solution, the present invention innovatively constructs medium temperature environment, to improve nitrogen oxides, sulphur
The reaction rate of oxide, and make coal-fired flue-gas uniform with ammonia and be sufficiently mixed, and then greatly improve multi-pollutant
Integrated removal efficiency.
Further, the integrated removing system further includes desulfurizing agent supplementary device, and desulfurizing agent supplementary device goes out
Material mouth is connect with the material-feeding port of the recirculating fluidized bed.
Further, the integrated removing system further includes ammonia feedway, the ammonia feedway and the spray ammonia
Grid connection.
Further, air preheater and the second province have been sequentially connected in series in the connecting pipe between postposition deduster and chimney
Coal device.
Further, the material recycling device is gravity screening machine, and the ash discharging hole of gravity screening machine and the first ash cellar connect
It connects；The desulfurizing agent is sodium bicarbonate, and first ash cellar is used to collect the raw material of production sodium sulphate industrial goods.
Further, first filter membrane bends to cylindrical shape, the surface apertures range of the first filter membrane be 130nm~
170nm。
Further, the ash discharging hole of preposition deduster is connect with the second ash cellar.
To realize above-mentioned technical purpose, the invention also discloses a kind of integration removings of multi-pollutant in coal-fired flue-gas
Method, the integration removal methods include the following steps；
Step 1, it is sprayed by the ammonia-spraying grid being set in flue to from the coal-fired flue-gas that the exhaust outlet of boiler is discharged
Ammonia, so that ammonia is mixed with coal-fired flue-gas；
Step 2, using in the first filter membrane removing coal-fired flue-gas being arranged in the preposition deduster being connect with flue end
Dust, and react speed using what the denitrating catalyst that adheres on the first filter membrane accelerated nitrogen oxides in coal-fired flue-gas and ammonia
Rate, to remove the dust and nitrogen oxides in coal-fired flue-gas simultaneously；
Step 3, it carries out dry desulfurization: coal-fired cigarette is removed by the recirculating fluidized bed connecting with the gas outlet of preposition deduster
Oxysulfide in gas；Wherein, sorbent particle is provided in the recirculating fluidized bed；
Step 4, the postposition deduster being connect using the gas outlet with recirculating fluidized bed collects the desulfurization that coal-fired flue-gas is taken out of
Agent particle and secondary removing is carried out to the residual dust in coal-fired flue-gas, then the sorbent particle of collection is filled into again to circulation
In fluidized bed；
Step 5, the flue gas discharge after pollutant being removed by the chimney connecting with the gas outlet of postposition deduster.
Based on above-mentioned technical solution, by the design of preposition deduster, the present invention can be realized denitrification process and dedusting
The organic coupling of process reaches the dual purpose of catalysis and filtering, and passes through the design of postposition deduster and recirculating fluidized bed,
The present invention, which can also realize the recycling of desulfurizing agent and make flue gas and desulfurizing agent that chemistry occur by way of dry desulfurization, to inhale
Reaction enclosure, to be finally reached the purpose of multi-pollutant integration removing.
It further, further include that the coal-fired flue-gas being discharged from the exhaust outlet of boiler is enabled to flow through the first economizer before step 1
The step of, to make the temperature of the coal-fired flue-gas flowed into flue be in mesophilic range using the first economizer；Wherein, described
Mesophilic range is 250 DEG C~450 DEG C.
Based on above-mentioned improved technical solution, the present invention innovatively constructs medium temperature environment, to improve nitrogen oxides, sulphur
The reaction rate of oxide, and make coal-fired flue-gas uniform with ammonia and be sufficiently mixed, and then greatly improve multi-pollutant
Integrated removal efficiency.
The invention has the benefit that the present invention can be realized the integration removing to the multi-pollutant in flue gas, have
Removal effect is good, apparatus and process is simple, occupy little space, do not generate secondary pollution and it is at low cost outstanding advantages of.
The present invention can be greatly saved investment cost and operating cost, and not will cause secondary pollution, be suitable for a variety of
Type boilers and other gas cleaning occasions, economic value and promotional value with higher.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the integrated removing system of multi-pollutant in coal-fired flue-gas.
Fig. 2 is the flow diagram of the integrated removal methods of multi-pollutant in coal-fired flue-gas.
In figure,
1, boiler；
2, flue；21, ammonia-spraying grid；22, ammonia feedway；
3, preposition deduster；31, the first filter membrane；32, the second ash cellar；
4, recirculating fluidized bed；41, desulfurizing agent supplementary device；
5, postposition deduster；51, the second filter membrane；52, the first ash cellar；
6, material recycling device；
7, chimney；71, air preheater；
8, the first economizer；
9, the second economizer.
Specific embodiment
With reference to the accompanying drawings of the specification the integrated removing system to multi-pollutant in a kind of coal-fired flue-gas of the invention and
Method carries out detailed explanation and illustration.
As shown in Figure 1, in a kind of coal-fired flue-gas of the present embodiment multi-pollutant integrated removing system, the integration removing
System specifically includes flue 2, preposition deduster 3, recirculating fluidized bed 4 and postposition deduster 5, preposition deduster 3, recirculating fluidized bed
4 and postposition deduster 5 be arranged in series；2 both ends of flue are separately connected the exhaust outlet of boiler 1 and the air inlet of preposition deduster 3, cigarette
Ammonia-spraying grid 21 is provided in road 2, ammonia-spraying grid 21 is used to spray into ammonia (such as ammonia) to flue 2, so that ammonia is filled with coal-fired flue-gas
Divide and mix, in the present embodiment, the ammonia nitrogen molar ratio at ammonia-spraying grid is 0.85~0.95, and the ammonia in ammonia-spraying grid 21 derives from ammonia
Feedway 22, ammonia feedway 22 are connect with ammonia-spraying grid 21, are provided with the first filter membrane 31 in preposition deduster 3, and first
Filter membrane 31 is filtering type membrane material, wherein the first filter membrane 31 bends to cylindrical shape, first filter membrane 31 of the present embodiment
Surface apertures range is 130nm~170nm, is attached with denitrating catalyst on the first filter membrane 31, to realize that denitration and dedusting are double
Recast is used；The gas outlet of preposition deduster 3 is connect with the air inlet of recirculating fluidized bed 4, is provided with desulfurizing agent in recirculating fluidized bed 4
Particle, for realizing desulfurization in recirculating fluidized bed 4, wherein sorbent particle derives from desulfurizing agent supplementary device 41, and desulfurization
The discharge port of agent supplementary device 41 is connect with the material-feeding port of recirculating fluidized bed 4, the sodium sulphur in the present embodiment, in recirculating fluidized bed 4
Than being 3~5, the residence time is set as 2s~4s；And the gas outlet of recirculating fluidized bed 4 is connect with the air inlet of postposition deduster 5,
It is provided with the second filter membrane 51 in postposition deduster 5, and is provided with material recycling device 6, object on the ash discharging hole of postposition deduster 5
The feedback outlet of material recyclable device 6 is connect with the material-feeding port of recirculating fluidized bed 4, and the present embodiment can returning by material recycling device 6
The desulfurizing agent of recycling is back to recirculating fluidized bed 4 by dipleg, to realize that the desulfurizing agent for taking flue gas out of returns in recirculating fluidized bed 4
It is reused, to significantly improve the utilization efficiency of desulfurizing agent；The gas outlet of postposition deduster 5 is connect with chimney 7, this
Air preheater 71 and second province's coal have been sequentially connected in series in connecting pipe between postposition deduster 5 in embodiment and chimney 7
Device 9, air preheater 71 and the second economizer 9 are for being recycled and being utilized to the heat in flue gas, to further increase
The scope of application of the invention.
The present invention also provides a kind of medium temperature flue gas multiple pollutant integrations to remove scheme as a preferred technical solution,
For more effectively removing SO2、NOXAnd dust, the integrated removing system of the present embodiment further includes being series at boiler 1 and flue 2
Between the first economizer 8, and the first economizer 8 is used to control the temperature of the coal-fired flue-gas flowed into flue 2 and is in medium temperature
In range, so that subsequent reduction reaction process and the coal-fired flue-gas process of circulation are in medium temperature temperature range, and then reach also
Former agent and coal-fired flue-gas are sufficiently mixed and improve the purpose of nitrogen oxides and oxysulfide reaction rate；Wherein, mesophilic range
It is 250 DEG C~450 DEG C.
The material recycling device 6 in the present embodiment is gravity screening machine as a preferred technical solution, is screened by gravity
Mode by unreacted desulfurizing agent with react generate material separate, the ash discharging hole of gravity screening machine and the first ash cellar 52 company
It connects；Desulfurizing agent in the present embodiment is preferably sodium bicarbonate, and the particle size range of sodium bicarbonate is between 30~70 μm, the first ash cellar
52 for collecting the raw material of production sodium sulphate industrial goods；In addition, the ash discharging hole of preposition deduster 3 is connect with the second ash cellar 32.
Known to through the above technical solution: present device simple process only needs the whole of recirculating fluidized bed and deduster
It closes, can be realized to SO in flue gas2, NOx and dust control；Inventive desulfurization uses desulfurization by dry method, avoids tradition
The investment operating cost of wet desulphurization is high, the secondary pollutions problem such as more waste water, high-humidity gas fume is brought to environment；The present invention is innovatively
Membrane material is coupled with denitrating catalyst, not only saves space, and reduces flue gas running resistance；The present invention can also
It realizes that desulfurizing agent recycles, and supplement back the desulfurizing agent of recirculating fluidized bed as fresh desulfurizing agent and the desulfurization do not reacted completely
The mixture of agent；So the present invention effectively increases the utilization efficiency of desulfurizing agent, has obviously saved cost.
As shown in Fig. 2, the present embodiment also discloses and the integrated removing system pair of multi-pollutant in above-mentioned coal-fired flue-gas
The removal methods answered, the removal methods and above-mentioned removing means are based on identical inventive concept, specially above-mentioned apparatus scene
Removing process when implementation.
Specifically, the present embodiment additionally provides a kind of integrated removal methods of multi-pollutant in coal-fired flue-gas, with reality
Existing SO2、NOXAnd the cooperation-removal of dust, the integration removal methods include the following steps.
Before step 1, the present embodiment includes that the coal-fired flue-gas being discharged from the exhaust outlet of boiler 1 is enabled to flow through the first economizer 8
The step of, to make the temperature of the coal-fired flue-gas flowed into flue 2 be in mesophilic range using the first economizer 8, to improve
Removal efficiency；Wherein, mesophilic range is 250 DEG C~450 DEG C.
Step 1, by the ammonia-spraying grid 21 that has been set in flue 2 to the coal-fired flue-gas being discharged from the exhaust outlet of boiler 1
Middle penetrating ammonia (for example, ammonia), so that ammonia be made to mix with coal-fired flue-gas, which is innovatively sprayed ammonia step in advance, to protect
Card coal-fired flue-gas sufficiently and can be mixed equably with the mixed gas of ammonia when reaching the first filter membrane 31, pass through above-mentioned side
Formula, the present invention improve denitration efficiency significantly；In the present embodiment, further include using ammonia feedway 22 to ammonia-spraying grid 21 into
The step of row ammonia supplies, ammonia feedway 22 is connect with ammonia-spraying grid 21.
Step 2, coal-fired cigarette is removed using the first filter membrane 31 being arranged in the preposition deduster 3 connecting with 2 end of flue
Most of dust in gas to reduce flue dust to the possibility of pollution of the sorbent particle in subsequent step, and utilizes first
The denitrating catalyst adhered on filter membrane 31 accelerates the reaction rate of nitrogen oxides and ammonia in coal-fired flue-gas, i.e., in denitration catalyst
The nitrogen oxides such as NO in coal-fired flue-gas are effectively restored under the catalysis of agent, with remove simultaneously dust in coal-fired flue-gas and
Nitrogen oxides；So the present invention can either be realized to NOXRemoving, again can to the flying dust in flue gas carry out high efficiency filter, i.e., together
When realize denitration and dedusting；Moreover, the first filter membrane 31 of the present embodiment creative utilization cylindrical shape is filtered flue dust, show
Work improves filter effect, and filtered dust is collected by the second ash cellar 32 connecting with the ash discharging hole of preposition deduster 3.
Step 3, it carries out dry desulfurization: making sorbent particle and flue gas in recirculating fluidized bed 4 that Chemisorption occur,
To remove the oxysulfide in coal-fired flue-gas, specific implementation by the recirculating fluidized bed 4 connecting with the gas outlet of preposition deduster 3
When, flue gas can be entered from 4 bottom of recirculating fluidized bed；It is provided with sorbent particle in recirculating fluidized bed 4, to realize in flue gas
Oxysulfide and desulfurizing agent carry out circular response.It further include using desulfurizing agent supplementary device 41 periodically to following in the present embodiment
The step of desulfurizing agent in ring fluidized bed 4 is supplemented, to supplement the desulfurizing agent loss in recirculating fluidized bed 4, desulfurizing agent is mended
It fills and sets 41 discharge port and connect with the material-feeding port of recirculating fluidized bed 4.
Step 4, it is taken out of using the collection coal-fired flue-gas of postposition deduster 5 being connect with the gas outlet of recirculating fluidized bed 4 de-
Sulphur agent particle and secondary removing carried out to the residual dust in coal-fired flue-gas, then by the sorbent particle of collection fill into again to
In recirculating fluidized bed 4, coal-fired flue-gas can be sent into postposition deduster 5 by 4 top exit of recirculating fluidized bed, desulfurizing agent is recycling
Fluidized state is in fluidized bed, partial particulate can be taken out of from recirculating fluidized bed by flue gas, be mingled with the unreacted desulfurization in part
Agent is collected by the postposition deduster 5 being arranged after recirculating fluidized bed, and sends recirculating fluidized bed back to, is made full use of, and specifically, is adopted
Use gravity screening machine as material recycling device, the material after gravity screening is two parts, and a part is not react de- completely
Sulphur agent particle (i.e. adsorbent) can be returned in recirculating fluidized bed 4 by feed back leg, and another part is the adsorbent of full utilization,
Specifically connect the ash discharging hole of gravity screening machine with the first ash cellar 52 for the industries such as glass as byproduct, can periodically from
Waste material is discharged ash discharging hole, and the amount of waste of discharge can be equal to the additional amount of fresh desulfurizing agent, desulfurizing agent used in the present embodiment
For sodium bicarbonate, the first ash cellar 52 is used to collect the raw material of production sodium sulphate industrial goods.
Step 5, the flue gas discharge after pollutant being removed by the chimney 7 connecting with the gas outlet of postposition deduster 5,
Specifically, the filtered flue gas that the present embodiment enables the gas outlet of postposition deduster 5 be discharged passes sequentially through 71 He of air preheater
It is discharged after second economizer 9 through chimney 7.
During present invention test, for SO2Concentration is in 1000mg/m3Left and right, NOxConcentration is in 400mg/m3It controls, is low
Coal-fired flue-gas under dust concentration, integrated removal effect of the invention are significant.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the description of this specification, reference term " the present embodiment ", " one embodiment ", " some embodiments ", " show
The description of example ", " specific example " or " some examples " etc. mean specific features described in conjunction with this embodiment or example, structure,
Material or feature are included at least one embodiment or example of the invention.In the present specification, above-mentioned term is shown
The statement of meaning property is necessarily directed to identical embodiment or example.Moreover, specific features, structure, material or the spy of description
Point may be combined in any suitable manner in any one or more of the embodiments or examples.In addition, without conflicting with each other,
Those skilled in the art can be by different embodiments or examples described in this specification and different embodiments or examples
Feature is combined.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modification, equivalent replacement and simple modifications etc., should all be included in the protection scope of the present invention in content.
Claims (10)
1. the integrated removing system of multi-pollutant in a kind of coal-fired flue-gas, it is characterised in that: the integration removing system packet
Include flue (2), preposition deduster (3), recirculating fluidized bed (4) and postposition deduster (5)；Flue (2) both ends are separately connected
The exhaust outlet of boiler (1) and the air inlet of preposition deduster (3), the flue (2) is interior to be provided with ammonia-spraying grid (21), before described
It sets in deduster (3) and is provided with the first filter membrane (31), be attached with denitrating catalyst on first filter membrane (31)；It is preposition to remove
The gas outlet of dirt device (3) is connect with the air inlet of recirculating fluidized bed (4), is provided with desulfurizing agent in the recirculating fluidized bed (4)
Grain；The gas outlet of recirculating fluidized bed (4) is connect with the air inlet of postposition deduster (5), is provided in the postposition deduster (5)
Second filter membrane (51) is provided with material recycling device (6) on the ash discharging hole of postposition deduster (5), material recycling device (6)
Feedback outlet is connect with the material-feeding port of recirculating fluidized bed (4)；The gas outlet of postposition deduster (5) is connect with chimney (7).
2. the integrated removing system of multi-pollutant in coal-fired flue-gas according to claim 1, it is characterised in that: described one
Bodyization removing system further includes the first economizer (8) being series between the boiler (1) and the flue (2), and described first
Economizer (8) is for being in the temperature for flowing into the coal-fired flue-gas in the flue (2) in mesophilic range；Wherein, in described
Warm range is 250 DEG C~450 DEG C.
3. the integrated removing system of multi-pollutant in coal-fired flue-gas according to claim 2, it is characterised in that: described one
Bodyization removing system further includes desulfurizing agent supplementary device (41), and the discharge port of desulfurizing agent supplementary device (41) and the recycle stream
Change the material-feeding port connection of bed (4).
4. the integrated removing system of multi-pollutant in coal-fired flue-gas according to claim 3, it is characterised in that: described one
It further includes ammonia feedway (22) that bodyization, which removes system, and the ammonia feedway (22) connect with the ammonia-spraying grid (21).
5. the integrated removing system of multi-pollutant in coal-fired flue-gas according to claim 4, it is characterised in that: postposition is removed
Air preheater (71) and the second economizer (9) have been sequentially connected in series in connecting pipe between dirt device (5) and chimney (7).
6. according to claim 1 into coal-fired flue-gas described in any claim in 5 multi-pollutant integrated removing system,
It is characterized by: the material recycling device (6) is gravity screening machine, the ash discharging hole of gravity screening machine and the first ash cellar (52) are even
It connects；The desulfurizing agent is sodium bicarbonate, and first ash cellar (52) is used to collect the raw material of production sodium sulphate industrial goods.
7. the integrated removing system of multi-pollutant in coal-fired flue-gas according to claim 6, it is characterised in that: described
One filter membrane (31) bends to cylindrical shape, and the surface apertures range of the first filter membrane (31) is 130nm~170nm.
8. the integrated removing system of multi-pollutant in coal-fired flue-gas according to claim 7, it is characterised in that: preposition to remove
The ash discharging hole of dirt device (3) is connect with the second ash cellar (32).
9. the integrated removal methods of multi-pollutant in a kind of coal-fired flue-gas, it is characterised in that: the integration removal methods packet
Include following steps；
Step 1, ammonia is sprayed into from the coal-fired flue-gas that the exhaust outlet of boiler is discharged by the ammonia-spraying grid being set in flue, with
Mix ammonia with coal-fired flue-gas；
Step 2, the powder in the first filter membrane removing coal-fired flue-gas being arranged in the preposition deduster connecting with flue end is utilized
Dirt, and accelerate using the denitrating catalyst that adheres on the first filter membrane the reaction rate of the nitrogen oxides and ammonia in coal-fired flue-gas,
To remove the dust and nitrogen oxides in coal-fired flue-gas simultaneously；
Step 3, it carries out dry desulfurization: being removed in coal-fired flue-gas by the recirculating fluidized bed being connect with the gas outlet of preposition deduster
Oxysulfide；Wherein, sorbent particle is provided in the recirculating fluidized bed；
Step 4, the postposition deduster being connect using the gas outlet with recirculating fluidized bed collects the desulfurizing agent that coal-fired flue-gas is taken out of
Grain and secondary removing is carried out to the residual dust in coal-fired flue-gas, then the sorbent particle of collection is filled into again to ciculation fluidized
In bed；
Step 5, the flue gas discharge after pollutant being removed by the chimney connecting with the gas outlet of postposition deduster.
10. the integrated removal methods of multi-pollutant in coal-fired flue-gas according to claim 9, it is characterised in that:
Before step 1, further include the steps that the coal-fired flue-gas being discharged from the exhaust outlet of boiler is enabled to flow through the first economizer, thus sharp
The temperature of the coal-fired flue-gas flowed into flue is in mesophilic range with the first economizer；Wherein, the mesophilic range is 250
DEG C~450 DEG C.
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