CN207137657U - A kind of coal-fired flue-gas dust-removing denitrification integrated device - Google Patents
A kind of coal-fired flue-gas dust-removing denitrification integrated device Download PDFInfo
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- CN207137657U CN207137657U CN201720780914.3U CN201720780914U CN207137657U CN 207137657 U CN207137657 U CN 207137657U CN 201720780914 U CN201720780914 U CN 201720780914U CN 207137657 U CN207137657 U CN 207137657U
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Abstract
A kind of coal-fired flue-gas dust-removing denitrification integrated device is the utility model is related to, boiler is connected with de-dusting de-nitration integrated, and de-dusting de-nitration integrated is connected with air preheater, and air preheater is connected with FGD desulfurizers, and FGD desulfurizers are connected with chimney；The de-dusting de-nitration integrated includes multiple dedusting denitrification integral modules, and all dedusting denitrification integral module assembleds turn into de-dusting de-nitration integrated；The dedusting denitrification integral module includes multiple ceramic filter catalyst monomers, and all ceramic filter catalyst monomers assemble to form dedusting denitrification integral module；The ceramic filter catalyst monomer includes monomer outer layer and monomer internal layer, and monomer internal layer is arranged on the inner side of monomer outer layer, and monomer outer layer is millipore filter.
Description
Technical field
A kind of coal-fired flue-gas dust-removing denitrification integral system is the utility model is related to, is widely used in coal-burning boiler, fire coal
The SCR denitration engineering and pocket type of kiln gas, electric dust removing system, belong to air pollution control technology, and the utility model belongs to ring
Protect technical field.
Background technology
China is that a few is using coal as one of country of main energy sources in the world, according to statistics, the titanium dioxide of China 90%
Sulphur, 67% nitrogen oxides, 70% smoke discharge amount come from the burning of coal.Coal-fired flue-gas contains flue dust, NOx, SO2, SO3,
The pollutants such as HCl, HF, heavy metal, pollutant concentration is high, and toxicity is big, has larger harm to ecological environment and human health.Cause
And flue gas needs to carry out purified treatment before air is discharged into.Industrially typical way is that flue gas saves from boiler in China at present
Coal device enters SCR reactors after coming out, and addition liquefied ammonia after reducing agent denitration as entering back into electric cleaner（Some also wants pocket type to remove
Dirt）Dedusting, the flue gas after dedusting enter back into FGD absorption towers and carry out desulfurization, and the neat stress after desulfurization is discharged into air by chimney again.
Existing dedusting denitration equipment has the following disadvantages：One is due to that denitration, dust removing units separate as separate unit
Arrangement, investment and floor space are added, simultaneously because flue gas resistance, electric precipitation add operating cost；Second, SCR catalyst
Need to be arranged on before deduster, dust content in flue gas is high, easily causes the blocking, abrasion and poisoning of catalyst, reduces
The service life of catalyst, and increase operating cost.Great demand and international skill in terms of China's Air Pollution Control
Art progress, by key technology research and development and the system integration, control technology and equipment of the exploitation with dedusting, denitration one, promote
It is very urgent that China's atmosphere quality improves task.
In the numerous denitration technology methods emerged, coal-fired flue-gas high-effective dust-removing, denitration simultaneously is a kind of new effective
Method.Its different domestic typical Flue Gas Denitrification Engineering technology, is domestic initiation.It integrates dedusting and denitration, can be with
Substitute the Benitration reactor and deduster in domestic fume treatment engineering at present.
Chinese patent 201510789500.2 discloses a kind of coal-fired flue-gas dust-removing and desulfurization denitrification integral combination process system
System, it is high temperature fume dust removal desulphurization denitration and the complete set of equipments of UTILIZATION OF VESIDUAL HEAT IN, is mainly slightly removed by ceramic multicyclone dust collector
Dirt and desulfurization, ceramic filter film filter carry out deep-purification dedusting and denitration, and heat exchanger is become cold wind using fume afterheat
Hot blast, it is combustion-supporting into boiler combustion mouth.The structure is by filling reducing agent, it is impossible to ensures denitration speed well.
Utility model content
The purpose of this utility model is to overcome above shortcomings in the prior art, and provides a kind of structure design and close
Reason, dust removal efficiency, denitration rate are high, and plant investment operating cost is low, the coal-fired flue-gas dust-removing of particularly suitable purifying coal-fired flue gas processing
Denitrification integral system.
The technical scheme in the invention for solving the above technical problem is：A kind of coal-fired flue-gas dust-removing denitrification integral system
System, including boiler, FGD desulfurizers and chimney, it is characterised in that：Also include de-dusting de-nitration integrated and air preheat
Device, boiler are connected with de-dusting de-nitration integrated, and de-dusting de-nitration integrated is connected with air preheater, air preheater
It is connected with FGD desulfurizers, FGD desulfurizers are connected with chimney；The de-dusting de-nitration integrated takes off including multiple dedustings
Nitre integrated module, all dedusting denitrification integral module assembleds turn into de-dusting de-nitration integrated；The dedusting denitration one
Body module includes multiple ceramic filter catalyst monomers, and all ceramic filter catalyst monomers assemble to form dedusting denitration
Integrated module；The ceramic filter catalyst monomer includes monomer outer layer and monomer internal layer, and monomer internal layer is arranged on monomer
The inner side of outer layer, monomer outer layer are millipore filter.Millipore filter is made up of refractory ceramics, and its efficiency of dust collection is up to 99.9%.It is single
Internal layer denitration efficiency>90%.Ceramic filter catalyst monomer is needed by calcination processing.The dust constaining come out from economizer
After gas mixing liquefied ammonia, monomer outer layer is first passed around（Filter layer）Dedusting, the flue gas after dedusting enter monomer internal layer（Catalyst table
Face）, the NO in the presence of catalystxSCR denitration reaction is carried out with ammonia reducing agent, generates the N of no environmental hazard2And H2O, reach
Environment protection emission requirement.
Micropore is provided with millipore filter described in the utility model, the aperture of micropore is more than or equal to 10 μm.
The material of monomer internal layer described in the utility model is nm-class rutile-type TiO2Or V2O5.The material of monomer internal layer
Other active materials can also be mixed.Ceramic filter catalyst monomer has excellent temperature tolerance, rotproofness and resistance to abrasion.
Dedusting denitrification integral module described in the utility model is shaped as cuboid, and dedusting denitrification integral module is indulged
The square for being shaped as 150mm × 150mm in section, the length of dedusting denitrification integral module is 1000mm~2000mm.Remove
The shape of dirt denitrification integral module can also be made variously-shaped according to the design needs.
Coal-fired flue-gas dust-removing denitrification integral system described in the utility model includes reaction tower, de-dusting de-nitration integrated
In reaction tower, boiler is connected with reaction tower.
Coal-fired flue-gas dust-removing denitrification integral system described in the utility model also includes static mixer, and boiler mixes with static state
Clutch is connected, and static mixer is connected with reaction tower.
Fixed plate is provided with de-dusting de-nitration integrated described in the utility model.
Compared with prior art, the utility model changes typical flue gas ash removal, denitration, the technological process of desulfurization at present,
Flue gas realizes dedusting denitration one after de-dusting de-nitration integrated, is not required to carry out electric precipitation again directly to carry out FGD to take off
Reach environment protection emission requirement after sulphur.Ceramic filter catalyst monomer is the product of composite material, and monomer outer layer is by high temperature
For the micropore size that ceramics are made up to 10 μ filter layer, monomer internal layer is to be handled using special technique by nm-class rutile-type
TiO2、V2O5The Catalytic Layer of isoreactivity composition composition.The utility model coal-fired flue-gas dust-removing denitrification integral system forms one kind
New flue gas ash removal, denitration, the engineering technology of desulfurization.The ash-laden gas come out from the economizer of boiler in proportion with NH3It is mixed
Enter de-dusting de-nitration integrated after conjunction, ash-laden gas is up to by the filter dedusting of monomer outer layer, efficiency of dust collection first
99.9%, bottom collection of the dust in de-dusting de-nitration integrated.Flue gas enters the catalyst surface of monomer internal layer after dedusting,
In the presence of catalyst with NH3Reducing agent carries out SCR denitration reaction, generates the N of no environmental hazard2、H2O.After dedusting denitration
Flue gas no longer needs to carry out electric precipitation and bag-type dusting, is directly entered after the progress desulfurization of FGD absorption towers from smoke stack emission, reaches ring
Protect emission request.This integrated apparatus enormously simplify technological process, reduce investment, space and operating cost.
Brief description of the drawings
Fig. 1 is the planar structure schematic diagram of the utility model embodiment de-dusting de-nitration integrated.
Fig. 2 is the planar structure schematic diagram of the utility model embodiment coal-fired flue-gas dust-removing denitrification integral system.
Embodiment
Below in conjunction with the accompanying drawings and the utility model is described in further detail by embodiment, and following examples are pair
It is of the present utility model explanation and the utility model is not limited to following examples.
Embodiment.
Referring to Fig. 1 to Fig. 2.
The present embodiment is a kind of coal-fired flue-gas dust-removing denitrification integral system, including boiler 1, de-dusting de-nitration integrated
2nd, air preheater 3, FGD desulfurizers 4 and chimney 5.Boiler 1 is connected with de-dusting de-nitration integrated 2, dedusting denitration one
Makeup is put 2 and is connected with air preheater 3, and air preheater 3 is connected with FGD desulfurizers 4, FGD desulfurizers 4 and the phase of chimney 5
Even.
Preferably, FGD desulfurizers 4 are FGD desulfurizing towers.
De-dusting de-nitration integrated 2 includes multiple dedusting denitrification integral modules, all dedusting denitrification integral modules
It is assembled into de-dusting de-nitration integrated 2.The shape of dedusting denitrification integral module can be made various according to the design needs
Shape.
Preferably, fixed plate 6 is provided with de-dusting de-nitration integrated 2.
Preferably, dedusting denitrification integral module is shaped as cuboid, the longitudinal section of dedusting denitrification integral module
The square for being shaped as 150mm × 150mm, the length of dedusting denitrification integral module is 1000mm~2000mm.
Dedusting denitrification integral module includes multiple ceramic filter catalyst monomers, all ceramic filter catalyst lists
Body assembles to form dedusting denitrification integral module.Ceramic filter catalyst monomer includes monomer outer layer and monomer internal layer, monomer
Internal layer is arranged on the inner side of monomer outer layer, and monomer outer layer is millipore filter.
Preferably, being provided with micropore on millipore filter, the aperture of micropore is more than or equal to 10 μm, millipore filter
As filter layer.Millipore filter is made up of refractory ceramics, and its efficiency of dust collection is up to 99.9%.
Preferably, the material of monomer internal layer is nm-class rutile-type TiO2、V2O5Or TiO2And V2O5Mixture.It is single
The material of internal layer can also mix other active materials.Ceramic filter catalyst monomer has excellent temperature tolerance, corrosion resistant
Property and resistance to abrasion.Monomer internal layer is as Catalytic Layer, monomer internal layer denitration efficiency>90%.
Preferably, coal-fired flue-gas dust-removing denitrification integral system includes going back reaction tower and static mixer, dedusting denitration
Integrated apparatus 2 is arranged in reaction tower, and boiler 1 is connected with reaction tower, and de-dusting de-nitration integrated 2 is used as SCR reactors.
Boiler 1 is connected with static mixer, and static mixer is connected with reaction tower, and economizer is provided with boiler 1.
The principle of SCR denitration reaction：
4NO+4NH3+O2 →4N2+6H2O（1）
NO+NO2+2NH3 →2N2+3H2O（2）
2NO2+4NH3+O2→3N2+ 6H2O（3）.
Preferably, parameter and denitration rate, NH of the present embodiment according to economizer exit flue gas3The design ceramics such as escapement ratio
Filter catalyst monomer and SCR reactors.
The present embodiment further comprises the method for work of coal-fired flue-gas dust-removing denitrification integral system.
SCR method process systems flow is mainly by storage ammonia, mixed ammonia, spray ammonia, reaction tower（Ceramic filter catalyst）System,
Flue and control system etc. form.First, liquefied ammonia is stored by automobile transportation to liquid ammonia storage tank, and liquefied ammonia passes through the steaming in evaporator
Vapour, hot water, be depressurized evaporation and be delivered to ammonia evaporator, blasted by air blower into ammonia air mixer with the amount of ammonia into
The air necessarily matched is diluted.Diluted ammonia is injected into flue barrier by the nozzle in spraying system, with
Flue gas mixes.In the case where nozzle quantity is less, in order to obtain the full and uniform distribution of ammonia and flue gas, static mixer make from
Flue gas in the economizer of boiler 1 out into dedusting denitrification integral through with after partial bypass high-temperature flue gas mixing temperature adjustment, filling
2 are put, is then mixed again with ammonia.
Preferably, NO during the present embodiment ceramic filter catalyst monomer reactionxWith NH3Actual mol ratio is
1：1.Better than the 1 of other products：1.2, reduce ammonia consumption.
Initial flue gas is by flying dust, NOxAnd SO2Composition.
After initial flue gas mixing ammonia, monomer outer layer in de-dusting de-nitration integrated 2 is first passed around（Filter layer）'s
Surface dust, more than 99.9% dust are filtered.Flue gas after dedusting enters monomer internal layer together with ammonia（Catalytic Layer）With catalysis
Agent contacts, and NOx carries out SCR denitration reaction with ammonia reducing agent in the presence of catalyst, generates the N of no environmental hazard2And H2O, it is residual
SO is stayed2.The flue gas come out from de-dusting de-nitration integrated 2 is due to having eliminated flying dust, it is not necessary to electric precipitation is carried out again,
After air preheater 3 reclaims heat, it is directly entered FGD desulfurizing towers and completes flue gas desulfurization, the flue gas after desulfurization terminates turns into
Clean flue gas, clean flue gas finally enter blowdown stack 5, reach environment protection emission requirement.
The present embodiment coal-fired flue-gas dust-removing denitrification integral components of system as directed design parameter and advantage are as follows：
1. denitration and dedusting are two-in-one, greatly simplify SCR processes, reduce energy consumption, can reduce SCR project total costs 30% with
On, it is synchronous to remove NO without electric precipitation and bag-type dustingxAnd flue dust, save a large amount of energy consumptions and technical process；
2. ceramic filter catalyst monomer Applicable temperature scope is wide, the Applicable temperature scope of the catalyst of monomer internal layer exists
Between 180~450 DEG C.For high temperature resistant up to 900-1000 DEG C, reaction efficiency change is steady；
NO in 3.SCR courses of reactionxWith NH3Actual mol ratio be 1：1, better than the 1 of other products：1.2, reduce ammonia and disappear
Consumption；
4. performance is better than honeycomb/board-like catalyst, practical response area is up to 90%, reaction speed:1.0m/min -1.5m/
Min, 1 cubic metre of catalyst can handle 5000 cubic metres of exhaust gas volumn, efficiency high, efficiency of dust collection 99.9%, denitration efficiency>
90%, the escaping of ammonia<1 ppm, pressure loss 500Pa-750Pa（Depending on project operating mode）, soot blowing using pulse high velocity air it is anti-
Soot blowing；Efficiency of dust collection is high, and floor space is small, is especially suitable for the old Transformation of Unit of headspace deficiency；
5. device is safeguarded simply, operation and maintenance expense is reduced, SCR catalyst is renewable, and (expense is fewer than conventional method
70%), the life-span is 5-7, and operation and maintenance cost is close to zero.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of its parts and components, it is named
Title etc. can be different, and the above content described in this specification is only to the utility model structure example explanation.
The equivalence changes or simple change that all construction, feature and the principle described according to the utility model patent design are done, are wrapped
Include in the protection domain of the utility model patent.The utility model person of ordinary skill in the field can be to described
Specific embodiment is made various modifications or supplement or substituted using similar mode, without departing from knot of the present utility model
Structure surmounts scope defined in the claims, all should belong to the scope of protection of the utility model.
Claims (7)
1. a kind of coal-fired flue-gas dust-removing denitrification integrated device, including boiler, FGD desulfurizers and chimney, it is characterised in that：Also
Including de-dusting de-nitration integrated and air preheater, boiler is connected with de-dusting de-nitration integrated, dedusting denitration one
Makeup is put to be connected with air preheater, and air preheater is connected with FGD desulfurizers, and FGD desulfurizers are connected with chimney；It is described
De-dusting de-nitration integrated includes multiple dedusting denitrification integral modules, and all dedusting denitrification integral module assembleds, which turn into, to be removed
Dirt denitrification integrated device；The dedusting denitrification integral module includes multiple ceramic filter catalyst monomers, all ceramics
Filter catalyst monomer assembles to form dedusting denitrification integral module；The ceramic filter catalyst monomer is included outside monomer
Layer and monomer internal layer, monomer internal layer are arranged on the inner side of monomer outer layer, and monomer outer layer is millipore filter.
2. coal-fired flue-gas dust-removing denitrification integrated device according to claim 1, it is characterised in that：The millipore filter
On be provided with micropore, the aperture of micropore is more than or equal to 10 μm.
3. coal-fired flue-gas dust-removing denitrification integrated device according to claim 1 or 2, it is characterised in that：In the monomer
The material of layer is nm-class rutile-type TiO2Or V2O5。
4. coal-fired flue-gas dust-removing denitrification integrated device according to claim 1 or 2, it is characterised in that：The dedusting takes off
Nitre integrated module is shaped as cuboid, and the longitudinal section of dedusting denitrification integral module is being shaped as 150mm × 150mm just
Square, the length of dedusting denitrification integral module is 1000mm~2000mm.
5. coal-fired flue-gas dust-removing denitrification integrated device according to claim 1 or 2, it is characterised in that：The coal-fired cigarette
Gas de-dusting de-nitration integrated includes reaction tower, and de-dusting de-nitration integrated is arranged in reaction tower, boiler and reaction tower
It is connected.
6. coal-fired flue-gas dust-removing denitrification integrated device according to claim 5, it is characterised in that：The coal-fired flue-gas removes
Dirt denitrification integrated device also includes static mixer, and boiler is connected with static mixer, and static mixer is connected with reaction tower.
7. coal-fired flue-gas dust-removing denitrification integrated device according to claim 6, it is characterised in that：The dedusting denitration one
Body makeup, which is put, is provided with fixed plate.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107233789A (en) * | 2017-06-30 | 2017-10-10 | 华电电力科学研究院 | A kind of coal-fired flue-gas dust-removing denitrification integral system and its method of work |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107233789A (en) * | 2017-06-30 | 2017-10-10 | 华电电力科学研究院 | A kind of coal-fired flue-gas dust-removing denitrification integral system and its method of work |
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