CN107961660A - Flue gas dry desulfurizing method of denitration based on ozone and red mud - Google Patents
Flue gas dry desulfurizing method of denitration based on ozone and red mud Download PDFInfo
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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
- B01D53/81—Solid phase processes
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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
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
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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
- B01D53/76—Gas phase processes, e.g. by using aerosols
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/104—Ozone
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a kind of flue gas dry desulfurizing method of denitration based on ozone and red mud.By ozone and smoke contacts, by least part nitrogen oxides in flue gas, so as to form the flue gas after pre-oxidation；Wherein, per 100000m3Flue gas add 40~60kg ozone；Flue gas after the pre-oxidation is contacted with desulfurization denitrification agent dry powder, at least part sulfur dioxide and nitrogen oxides in flue gas are removed, so as to form desulphurization denitration flue gas；Wherein, the desulfurization denitrification agent dry powder is made of 45~80 parts by weight red muds and 20~55 parts by weight nano-metal-oxides；The complete desulfurization denitrification agent dry powder of unreacted in the desulphurization denitration flue gas is trapped, and is recycled.The method of the present invention can carry out dry desulfurization denitration to flue gas at low cost using red mud as primary raw material.
Description
Technical field
The present invention relates to a kind of flue gas dry desulfurizing method of denitration, and in particular to a kind of flue gas based on ozone and red mud takes off
Sulphur method of denitration.
Background technology
At present, countries in the world exploitation desulphurization denitration technology it is 200 kinds not lower, but can business application less than 10%.More
Ripe desulfurization technology includes limestone-gypsum wet flue gas desulfurization technology, dual alkali scrubbing FGD process technology etc..Denitration technology master
It is most widely used with selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR).In view of often exist at the same time in flue gas
SO2And NOX, desulphurization denitration is generally carried out with the method that SCR/SNCR is combined using FGD (flue gas desulfurization) in industry at present,
The method of this classification processing is higher to pollutant removing efficiency, but investment is also higher with operating cost, and complex process, occupation of land
Area, equipment are various.Therefore, study a kind of method of synchronized desulfuring and denitrifying has become the research focus of filed of flue gas purification.
The denitration method for flue gas SCR used at present and SNCR utilizes reduction principle.Utilize reducing agent (ammonium hydroxide, urea etc.)
By the NO in flue gasXIt is converted into N2.Such method required temperature is higher, complex process, bad adaptability.
Another method is to utilize oxidation mechanisms.By NO in flue gasXIn occupy the NO of larger proportion and be oxidized to and be soluble in
The NO of water2The materials such as NO3-N and NO2-N are generated etc. higher nitrogen oxides, then with alkaline matter, are taken off so as to carry out flue gas
Nitre.This method required temperature is relatively low, synchronous with desulfurization can carry out.CN1539546A discloses a kind of flue gas synchronized desulfuring and denitrifying side
Method, using a kind of highly active absorbent being made of flyash, calcium hydroxide and additive, carries out same in circulating fluidized bed system
Desulphurization denitration is walked, but synchronized desulfuring and denitrifying efficiency has much room for improvement, and absorbent and oxidant consumption can be caused excessive, improve operation
Cost.
In conclusion existing desulfurization denitration method still cost is excessive or inefficient, however it remains to high efficiency, it is low into
The demand of this flue gas desulfurization and denitrification technology.
The content of the invention
It is an object of the invention to provide a kind of flue gas dry desulfurizing method of denitration based on ozone and red mud.This method with
Aluminium industry waste red mud is primary raw material, can high efficiency, at low cost to flue gas carry out dry desulfurization denitration.Specifically
Ground, the present invention include herein below.
The flue gas dry desulfurizing method of denitration based on ozone and red mud of the present invention comprises the following steps：
(1) pre-oxidation step：By ozone and smoke contacts, by least part nitrogen oxides in flue gas, so that shape
Into the flue gas after pre-oxidation；Wherein, per 100000m3Flue gas add 40~60kg ozone；
(2) desulphurization denitration step：Flue gas after the pre-oxidation is contacted with desulfurization denitrification agent dry powder, is removed in flue gas
At least part sulfur dioxide and nitrogen oxides, so as to form desulphurization denitration flue gas；Wherein, the desulfurization denitrification agent dry powder by 45~
80 parts by weight red muds and 20~55 parts by weight nano-metal-oxides composition；
(3) dust removal step：The complete desulfurization denitrification agent dry powder of unreacted in the desulphurization denitration flue gas is trapped, and is circulated
Use.
Method in accordance with the invention it is preferred that the water content of the red mud is below 40wt%, and the particle diameter of red mud is
It is more than 200 mesh.
Method in accordance with the invention it is preferred that the method further comprises making red mud heat at 150~200 DEG C
It is dehydrated to the step that water content is below 40wt%.
Method in accordance with the invention it is preferred that the granularity of the nano-metal-oxide is 10~60nm.
Method in accordance with the invention it is preferred that the nano-metal-oxide is selected from by MgO, CaO, K2O、CuO、MnO2、
Al2O3、Fe2O3And V2O5At least one of group of composition.
Method in accordance with the invention it is preferred that the nano-metal-oxide include 20~35 parts by weight MgO, 0.01~
0.05 parts by weight MnO2, 1~3 parts by weight CuO, 0.2~0.8 parts by weight CaO and 0.01~0.2 parts by weight Fe2O3。
Method in accordance with the invention it is preferred that the nano-metal-oxide further includes 0.01~0.03 parts by weight
V2O5。
Method in accordance with the invention it is preferred that the desulphurization denitration step carries out in recirculating fluidized bed absorption plant.
Method in accordance with the invention it is preferred that the method further comprises following water by the injection of reverse-flow type nozzle
The step of ring fluid bed absorption plant.
Method in accordance with the invention it is preferred that the reverse-flow type nozzle is arranged on the literary mound of recirculating fluidized bed absorption plant
In expander section.
The flue gas dry desulfurizing method of denitration of the present invention, as desulphurization denitration raw material, is run into using industrial waste red mud
This is low, and subsequent products can carry out recycling, and economic benefit is higher, amplifies beneficial to industrialization.The method of the present invention is using red
Mud and ozone cooperative desulphurization denitration, synthesis desulfurating efficiency is up to more than 95%, denitration efficiency up to more than 85%.In addition, pass through this hair
Bright red mud base desulfurization denitrification agent dry powder, water consumption is reduced in operational process, and without catalyst bed, is reduced resistance, dropped
Low operating cost.
Embodiment
With reference to specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to
This.
In the present invention, unless otherwise stated, " part " refers to the number based on weight, " % " and " wt% " refers to be based on
The percentage of weight.
" desulfurization denitration method " of the present invention is dry desulfurization method of denitration, it belongs to entirely different with wet desulphurization denitration
Two class flue gas processing methods.Do not include any water in addition to unavoidable a small amount of water in the desulfurization denitrification agent of the present invention,
Usually dry powder form exists.
The desulfurization denitration method of the present invention includes (1) pre-oxidation step, (2) desulphurization denitration step and (3) dust removal step.Under
Face describes each step in detail.
Pre-oxidation step：
The pre-oxidation step of the present invention is included ozone and smoke contacts, by least part in flue gas, preferably largely,
Such as more than 80% nitrogen oxides so that formed pre-oxidation after flue gas.Per 100000m3Flue gas addition 40~
The ozone of the ozone of 60kg, preferably 50~55kg.Preferably, when with ozone contact, the temperature for controlling flue gas is 100~150
DEG C, preferably 100~130 DEG C, within this range ozone can play more excellent denitration.
By making ozone and smoke contacts can be by least part lower nitrogen oxides (such as NO) in flue gas in the present invention
It is oxidized to NO2Etc. higher nitrogen oxides.Such higher nitrogen oxides can react generation nitrate or Asia with alkaline metal oxide
Nitrate, so as to fulfill denitration effect.
In certain embodiments, contact of the ozone with flue gas carries out in device is pre-oxidized, the flue gas after pre-oxidation after
It is continuous to enter the absorption tower containing desulfurization denitrification agent.
Desulphurization denitration step：
The desulphurization denitration step of the present invention includes contacting the flue gas after pre-oxidation with desulfurization denitrification agent, so as to remove flue gas
In at least part sulfur dioxide and nitrogen oxides.In the present invention, desulfurization denitrification agent is made of red mud and nano-metal-oxide.
The dosage of red mud is 60~80 parts by weight, preferably 65~76 parts by weight；The dosage of nano-metal-oxide is 20~55 parts by weight,
It is preferred that 22~52 parts by weight.
Present invention discover that the desulfurization denitrification agent being made of the red mud in particular range and nano-metal-oxide is used for dry method
With excellent effect during desulphurization denitration.Concrete reason is unclear, and inventor speculates, red mud in red mud base desulfurization denitrification agent
Basicity is higher, the SO caning absorb in flue gas2, and contain suitable iron oxide in desulfurization denitrification agent, for part NO and O2Reaction
With good catalytic activity.In addition, in the nano-metal-oxide added, MnO2And Fe2O3Catalysis oxidation effect is respectively provided with to NO
Fruit, can will be NO not by the NO catalysis oxidations of ozone oxidation2, so that the alkaline matter being desulfurized in denitrfying agent absorbs, reach
Further denitration effect.Preferably, V can be included in desulfurization denitrification agent of the invention2O5, it can be with catalysis oxidation SO2To SO3,
SO3Reach desulfurization effect with alkali substance reaction generation sulfate.Meanwhile the addition of nanosize metal oxide, increase ratio
Surface area, adds the contact area of oxygen, metal oxide and flue gas, improves for SO in flue gas2With nitrogen oxides NOX
Adsorptivity, so as to improve denitrification efficiency.
In the present invention, the preparation of desulfurization denitrification agent can use any method known in the art.Illustrative preparation method bag
Include red mud pretreatment；The metal oxide of the component is prepared, is prepared into nano-scale particle；Red mud and nanometer grade gold after processing
Belong to oxide to be uniformly mixed in the regulation ratio.Specifically, the preparation of desulfurization denitrification agent may include following steps：1. by red mud
In 150 DEG C~200 DEG C thermal dehydrations；2. dewatered red mud is crushed as powders more than 200 mesh；3. the powder is with granularity
The nanosize metal oxide mixing of 10~60nm, up to desulfurization denitrification agent.
In the present invention, red mud can be the alkaline scrap material discharged in aluminium industry production.Represented with mass percent, red mud
Main chemical compositions and its content are calcium oxide 6~50%, sodium oxide molybdena 2~10%, aluminium oxide 5~20%, iron oxide 5~50%
With silica 3~25%；And the basicity of wastewater from red mud is 3000~15000mg/L.
In the present invention, the water content of red mud is below 40wt%, such as 30~40wt%.In certain embodiments, lead to
Cross thermal dehydration, for example, at 150~200 DEG C computer heating control red mud water content within the above range.
In the present invention, the particle diameter of red mud can be more than 200 mesh.For Control granularity within this range, it may include crush
Or process of lapping.In this particle size range, the particle of red mud is smaller, and specific surface area is larger, is conducive to improve its connecing with flue gas
Contacting surface is accumulated, and improves the adsorptivity to sulfur dioxide in flue gas etc., further improves desulfuration efficiency.
In the present invention, the granularity of nano-metal-oxide can be 10~60nm, preferably 10~50nm, further preferred 15~
40nm, most preferably 20~30nm.It any equipment can be used to be crushed into nanometer grade powder, ground preferably using high energy ball mill
System, is not particularly limited using ball mill number, reaches required particle size range.
In the present invention, nano-metal-oxide is selected from by MgO, CaO, K2O、CuO、MnO2、Al2O3、Fe2O3And V2O5Composition
At least one of group.Preferably, nano-metal-oxide includes 20~35 parts by weight MgO, 0.01~0.05 parts by weight
MnO2, 1~3 parts by weight CuO, 0.2~0.8 parts by weight CaO and 0.01~0.2 parts by weight Fe2O3.It is highly preferred that nano metal oxygen
Compound further includes 0.01~0.03 parts by weight V2O5.According to embodiment of the present invention, nano-metal-oxide is by 20
~35 parts by weight MgO, 0.01~0.05 parts by weight MnO2, 1~3 parts by weight CuO, 0.2~0.8 parts by weight CaO and 0.01~0.2
Parts by weight Fe2O3Composition.According to another implementation of the invention, nano-metal-oxide by 20~35 parts by weight MgO,
0.01~0.05 parts by weight MnO2, 1~3 parts by weight CuO, 0.2~0.8 parts by weight CaO, 0.01~0.2 parts by weight Fe2O3With
0.01~0.03 parts by weight V2O5Composition.
Make it is a discovery of the invention that the nano-metal-oxide of above-mentioned specific composition is combined with red mud with coordinated desulfurization denitration
With.Concrete reason is not known, thus it is speculated that may is that：Nano-metal-oxide can promote the SO in flue gas2To SO3Oxidation,
Aoxidize the SO of generation3With water and reactive metal oxide generation sulfate.The SO that a small amount of metal oxide is adsorbed2Gas, water with
O in surface metal oxide reaction generation sulphite, with flue gas2Reaction generation sulfate.In addition, NO in flue gas2Deng high price
Reactive metal oxide generation nitrate and nitrite in nitrogen oxides, with desulphurization denitration, reach denitration effect.It is not smelly
The NO of oxygen oxidation reaches desulfurization denitrification agent surface with flue gas, and NO is transformed under the catalytic action of metal oxide active position2,
And then reach further denitration effect with basic anhydride reaction.NO gases, water and its surface of a small amount of metal oxide surface
Oxygen reaction generation nitrate in reaction generation nitrite, with flue gas.
In the present invention, flue gas desulfurization and denitrification can be to carry out in any equipment.Preferably, the desulphurization denitration step is circulating
Carried out in fluid bed absorption plant (such as CFB absorption towers).It is venturi void tower structure in tower, using porous Venturi nozzle shape
Formula, desulfurization denitrification agent repeatedly recycle in tower, increase desulfurization denitrification agent and smoke contacts time, it is general up to 30min with
On.
In certain embodiments, method of the invention further comprises：Water is injected into recycle stream by reverse-flow type nozzle
The step of changing bed absorption plant.Reverse-flow type nozzle can be arranged on the venturi expander section of recirculating fluidized bed absorption plant.Pre- oxygen
Flue gas after change enters recirculating fluidized bed absorption plant by gas approach through Venturi nozzle, with being added from desulfurization denitrification agent storehouse
The complete desulfurization denitrification agent dry powder blend of unreacted that desulfurization denitrification agent dry powder and material circulating system return, then with through reverse-flow type
The water mixing that nozzle sprays into, to realize flue gas synchronized desulfuring and denitrifying.
Dust removal step：
The complete desulfurization denitrification agent of unreacted that the dust removal step of the present invention includes trapping in the desulphurization denitration flue gas is done
Powder, and recycle.In certain embodiments, dedusting of the invention includes being separated according to the weight of particle in flue gas after purification
Obtain byproduct and the complete desulfurization denitrification agent dry powder of unreacted.Exemplary dust removal step includes desulphurization denitration flue gas by absorbing
Tower outlet enters in bag filter, after the complete desulfurization denitrification agent dry powder of unreacted is captured in flue gas, passes through Matter Transfer
System returns to absorption tower and continues to participate in reaction together with fresh desulfurization denitrification agent, and byproduct can be by arranging outside transport system.Clearly
Clean flue gas is discharged after dedusting through chimney, completes gas cleaning.
In addition to the foregoing steps, flue gas dry desulfurizing method of denitration of the invention may also include other steps.It is for example, pre-
Dust removal step.In certain embodiments, it is more than 90% that efficiency of dust collection is controlled in pre- dust removal step, so as to remove big in flue gas
Partial dust particles, reduce the load of subsequent handling, reduce influence of the content of ashes to desulphurization denitration in fire coal.After dedusting
Dustiness in flue gas is 10~30mg/Nm3, it is preferably 15~20mg/Nm3.Bag filter and quiet may be selected in pre-dedusting device
Electric precipitator, is preferably electrostatic precipitator.
" part " in following embodiments represents parts by weight, unless specifically stated otherwise.Raw material, work used in following embodiments
Skill condition is common raw material in the art or technique.Flue gas desulfurization and denitrification duty parameter see the table below 1 in following embodiments.
Table 1, desulphurization denitration duty parameter
| Sequence number | Parameter | Unit | Numerical value |
| 1 | Inlet flue gas amount (operating mode) | m3/h | 180000 |
| 2 | Inlet flue gas amount (mark condition) | Nm3/h | 121935 |
| 3 | Inlet flue gas temperature | ℃ | 120 |
| 4 | SO2Entrance concentration | mg/Nm3 | 1500 |
| 5 | Entrance NOXConcentration | mg/Nm3 | 400 |
Embodiment 1
(1) modulation of red mud base desulfurization denitrification agent and pre-oxidation treatment：
(1) red mud is uniformly mixed with nanosize metal oxide (25nm) according to formula as below, obtains desulfurization denitrification agent.
Table 2, red mud base desulphurization denitration agent prescription
(2) ozone pre-oxidation
The ozone additive amount for being set into flue gas is 50kg/h.
(2) removing SO is carried out using desulfurization denitrification agent2、NOX
Prepared desulfurization denitrification agent dry powder is added into recirculating fluidized bed absorption tower, desulfurization is synchronized using dry method and is taken off
Nitre.The results are shown in Table 3 for the emission monitoring of final outlet exhaust gas.
(3) using the complete desulfurization denitrification agent dry powder of unreacted in bag filter trapping desulphurization denitration flue gas, pass through
The circulatory system returns to absorption tower and continues to participate in reaction together with fresh desulfurization denitrification agent.The byproduct warp obtained after desulphurization denitration
Arranged outside transport system.
Table 3, desulphurization denitration emission behaviour
| Sequence number | Parameter | Unit | Numerical value |
| 1 | Exiting flue gas amount (operating mode) | m3/h | 128571 |
| 2 | Exiting flue gas amount (mark condition) | Nm3/h | 108668 |
| 3 | Exhaust gas temperature | ℃ | 50 |
| 4 | SO2Concentration of emission | mg/Nm3 | 57 |
| 5 | NOXConcentration of emission | mg/Nm3 | 55.2 |
| 6 | Desulfuration efficiency | % | 96.2 |
| 7 | Denitration efficiency | % | 86.8 |
Embodiment 2
Compared with Example 1, embodiment 2 reduces red mud accounting, adds the proportioning of nanosize metal oxide, at the same time
Ozone additive amount is added, other conditions are constant, and technical process is same as Example 1.Specific difference is as described below.
Red mud is uniformly mixed with nanosize metal oxide (25nm) 1. being formulated according to table 4, obtains desulfurization denitrification agent.
Table 4, red mud base desulphurization denitration agent prescription
2. ozone additive amount is 53kg/h in pre-oxidation.
The results are shown in Table 5 for outlet exhaust emission monitoring.
Table 5, desulphurization denitration emission behaviour
| Sequence number | Parameter | Unit | Numerical value |
| 1 | Exiting flue gas amount (operating mode) | m3/h | 128340 |
| 2 | Exiting flue gas amount (mark condition) | Nm3/h | 108473 |
| 3 | Exhaust gas temperature | ℃ | 50 |
| 4 | SO2Concentration of emission | mg/Nm3 | 45 |
| 5 | NOXConcentration of emission | mg/Nm3 | 38.8 |
| 6 | Desulfuration efficiency | % | 97.5 |
| 7 | Denitration efficiency | % | 90.3 |
Embodiment 3
Compared with Example 1, embodiment 3 reduces red mud accounting, have adjusted the proportioning of nanosize metal oxide, increase
Nanoscale V2O5, while ozone additive amount is adjusted to 55kg/h, other conditions are constant, and technical process is same as Example 1.Tool
Body difference is as described below.
Red mud is uniformly mixed with nanosize metal oxide (25nm) 1. being formulated according to table 6, obtains desulfurization denitrification agent.
Table 6, red mud base desulphurization denitration agent prescription
2. ozone additive amount is 55kg/h in pre-oxidation.
The results are shown in Table 7 for outlet exhaust emission monitoring.
Table 7, desulphurization denitration emission behaviour
It can be seen from the above embodiments that, method of the invention is with ozone pre-oxidation, and prepares desulphurization denitration with red mud
Agent, can effectively purify flue gas.The addition of nanosize metal oxide can improve denitrification efficiency.In addition,
The method water consumption of the present invention is few, and no catalysis layer resistance, operating cost is relatively low, has larger economic advantages and environmental benefit.
Present invention is not limited to the embodiments described above, in the case of without departing substantially from the substantive content of the present invention, this area skill
Any deformation, improvement, the replacement that art personnel are contemplated that each fall within the scope of the present invention.
Claims (10)
1. a kind of flue gas dry desulfurizing method of denitration based on ozone and red mud, it is characterised in that comprise the following steps：
(1) pre-oxidation step：By ozone and smoke contacts, by least part nitrogen oxides in flue gas, so as to be formed pre-
Flue gas after oxidation；Wherein, per 100000m3Flue gas add 40~60kg ozone；
(2) desulphurization denitration step：Flue gas after the pre-oxidation is contacted with desulfurization denitrification agent dry powder, is removed in flue gas at least
Part sulfur dioxide and nitrogen oxides, so as to form desulphurization denitration flue gas；Wherein, the desulfurization denitrification agent dry powder is by 45~80 weights
Measure part red mud and 20~55 parts by weight nano-metal-oxides composition；
(3) dust removal step：The complete desulfurization denitrification agent dry powder of unreacted in the desulphurization denitration flue gas is trapped, and circulation makes
With.
2. according to the method described in claim 1, it is characterized in that, the water content of the red mud is below 40wt%, and red mud
Particle diameter to be more than 200 mesh.
3. according to the method described in claim 2, it is characterized in that, the method further comprises making red mud 150~200
Step of the thermal dehydration to water content for below 40wt% at DEG C.
4. according to the method described in claim 1, it is characterized in that, the granularity of the nano-metal-oxide is 10~60nm.
5. according to the method described in claim 4, it is characterized in that, the nano-metal-oxide is selected from by MgO, CaO, K2O、
CuO、MnO2、Al2O3、Fe2O3And V2O5At least one of group of composition.
6. according to the method described in claim 5, it is characterized in that, the nano-metal-oxide includes 20~35 parts by weight
MgO, 0.01~0.05 parts by weight MnO2, 1~3 parts by weight CuO, 0.2~0.8 parts by weight CaO and 0.01~0.2 parts by weight
Fe2O3。
7. according to the method described in claim 6, it is characterized in that, the nano-metal-oxide further include 0.01~
0.03 parts by weight V2O5。
8. according to claim 1~7 any one of them method, it is characterised in that the desulphurization denitration step is ciculation fluidized
Carried out in bed absorption plant.
9. according to the method described in claim 8, it is characterized in that, the method further comprises spraying water by reverse-flow type
Mouth injects the step of recirculating fluidized bed absorption plant.
10. according to the method described in claim 9, it is characterized in that, the reverse-flow type nozzle is arranged on recirculating fluidized bed absorption
The venturi expander section of device.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN113499674A (en) * | 2021-08-27 | 2021-10-15 | 中晶环境科技股份有限公司 | Absorbent for flue gas desulfurization, preparation method thereof and application of composition |
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