CN207361825U - A kind of high-concentration ammonia nitrogenous wastewater cooperates with the system administered with flue gas of refuse burning NOx pollutants - Google Patents
A kind of high-concentration ammonia nitrogenous wastewater cooperates with the system administered with flue gas of refuse burning NOx pollutants Download PDFInfo
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- CN207361825U CN207361825U CN201721288038.9U CN201721288038U CN207361825U CN 207361825 U CN207361825 U CN 207361825U CN 201721288038 U CN201721288038 U CN 201721288038U CN 207361825 U CN207361825 U CN 207361825U
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Abstract
The system administered is cooperateed with flue gas of refuse burning NOx pollutants the utility model discloses a kind of high-concentration ammonia nitrogenous wastewater, including：Adjust pH ponds, first order ammonia-nitrogen stripping tower, second level ammonia-nitrogen stripping tower and absorption tower, the tune pH ponds are used for adjusting the pH value of ammonia nitrogen waste water, the first order ammonia-nitrogen stripping tower, second level ammonia-nitrogen stripping tower series operation, enable the ammonia of free state all to blow out, into absorption tower；The absorbing liquid demineralized water reaction generation ammonium hydroxide that ammonia is sprayed with this tower spray tube in the absorption tower, is allowed to constantly contact with ammonia, ammonia concn increase, is discharged when being recycled to a certain concentration inside the absorption tower through circulating pump circulation；Pure air after processing is discharged by absorption tower top exhaust tube.The utility model has the advantages that principle is simple, easily promotes, high treating effect.
Description
Technical field
The utility model is mainly concerned with environmental technology field, refers in particular to a kind of high-concentration ammonia nitrogenous wastewater and flue gas of refuse burning
The method and system that the collaboration of NOx pollutants is administered.
Background technology
Digested sludge dehydration liquid, landfill leachate, catalyst manufacturer waste water, meat processing waste water and synthesis ammonification work are given up
The ammonia nitrogen (more than 500mg/L, even up to thousands of mg/L) containing high concentration such as water.Excessive ammonia nitrogen, which is discharged into water body, will cause water
Body eutrophication, reduces water body ornamental value, and can also influence aquatile by the NO3-N and NO2-N of oxidation generation
The even health of the mankind.Therefore, denitrogenation of waste water processing gets more and more people's extensive concerning, and the big difficult point of one in wastewater treatment.
At present for ammonia nitrogen waste water, main denitrogenation method has biological nitrification and denitrification, break point chlorination, air lift stripping and ion-exchange
Deng, but for high-concentration ammonia nitrogenous wastewater, general physical chemistry method ammonia nitrogen concentration cannot be dropped to it is sufficiently low (such as 100mg/L with
Under), it is more to be handled using biochemical combination method.Using the ammonia nitrogen in blow-off method+biochemical process degradation water, by ammonia aeration, ammonia can be reduced
To the toxicity of subsequent biochemical processing, coordinate digestion denitrification denitrogenation, can realize ammonia nitrogen qualified discharge after sewage disposal.Ammonia aeration
It is that gas is passed through in water, gas-liquid mutually comes into full contact with, and the free ammonia for making to dissolve in waste water passes through gas-liquid interface, turns to gas phase
Move, so as to achieve the purpose that removal of ammonia and nitrogen, the follow-up absorption tower of the ammonia of generation can be made into ammonium hydroxide after absorbing.But such a method system
Into ammonium hydroxide be extremely difficult to ammonia (NH in industrial ammonia3) content >=20% (or >=25%) requirement, ammonium hydroxide transport with storage
It is required that limitation is more, outward transport formality is complicated and there are a large amount of security risks, therefore this method generates the later use of product ammonium hydroxide
It is a big difficult point.
SNCR (Selective Non-Catalytic Reduction) technology, i.e. selective non-catalytic reduction technology, it
It is one of gas denitrifying technology main at present.Within the scope of -1150 DEG C this narrow temperature of 850 DEG C of burner hearth, in no catalysis
Under agent effect, NH3Or the amino reductive such as urea optionally reduces the NOx in flue gas.
Utility model content
The technical problems to be solved in the utility model is that：It is new for technical problem existing in the prior art, this practicality
Type provides a kind of principle, and simply, easily popularization, the high-concentration ammonia nitrogenous wastewater of high treating effect and flue gas of refuse burning NOx pollutants are assisted
With the system administered.
In order to solve the above technical problems, the utility model uses following technical scheme：
A kind of high-concentration ammonia nitrogenous wastewater cooperates with the system administered with flue gas of refuse burning NOx pollutants, including：Tune pH ponds,
First order ammonia-nitrogen stripping tower, second level ammonia-nitrogen stripping tower and absorption tower, the tune pH ponds are used for adjusting the pH value of ammonia nitrogen waste water, institute
First order ammonia-nitrogen stripping tower, second level ammonia-nitrogen stripping tower series operation are stated, the ammonia of free state is all blown out, into absorption
Tower；The absorbing liquid demineralized water reaction generation ammonium hydroxide that ammonia is sprayed with this tower spray tube in the absorption tower, in the absorption tower
Portion is allowed to constantly contact with ammonia through circulating pump circulation, and ammonia concn increase, is discharged when being recycled to a certain concentration；It is clean after processing
Net air is discharged by absorption tower top exhaust tube.
Further as Tthe utility model system is improved：It is sent into after ammonia circulation in the absorption tower and for burning
Stove SNCR denitration system.
Further as Tthe utility model system is improved：The SNCR denitration system includes：
Ammonia spirit fills pump unit, for ammonium hydroxide is sent into ammonia spirit holding vessel unit；
Ammonia spirit holding vessel unit, for being stored to ammonium hydroxide；
Soft water holding vessel unit, by soft water conveying pump unit；
Soft water conveys pump unit, for will dilution reducing agent to the softened water pressurized delivered of debita spissitudo to mixed allocation list
Member；
Mixed allocation unit, for controlling urea and the quantitative mixing of soft water and fixed direction allocation, mixed allocation unit will be also
Former agent and water are mixed to a certain concentration；
Compressed air allocation unit, is correspondingly arranged with mixed allocation unit；
Sprayer unit, connects reducing agent and station-service compressed air that the module of mixed allocation unit is sent out respectively；
Control system, for being controlled to above-mentioned each component.
Further as Tthe utility model system is improved：The ammonia spirit holding vessel unit is furnished with magnetic double level gauge
With emptying flusher, and there is bound liquid level alarm device.
Further as Tthe utility model system is improved：Injector in the sprayer unit by flexible hose with
Reducing agent pipeline is connected with compressed air pipe, the telescopic support tube welded on furnace wall cooling of whole injector
On.
Compared with prior art, the utility model has the advantage of：
1st, the high-concentration ammonia nitrogenous wastewater of the utility model cooperates with the system administered with flue gas of refuse burning NOx pollutants, adopts
SNCR technology reducing agents, collaboration processing waste incinerator cigarette are used as by the ammonium hydroxide that ammonia aeration method is produced by the use of high-concentration ammonia nitrogenous wastewater
NOx pollutants in gas, especially in sewage, sludge treatment factory and garbage incinerating power plant and the fixed-end forces garden deposited, have
Realization is worth, is necessary and possible.It absorbs system using this high-concentration ammonia nitrogenous wastewater of sludge press filtration liquid through two-stage ammonia aeration+ammonia
Into the ammonium hydroxide of 10%-15% concentration, for the reduction medicament of waste incinerator SNCR denitration, realize high-concentration ammonia nitrogenous wastewater with
The collaboration of both pollutants of NOx is administered in flue gas of refuse burning.
2nd, the high-concentration ammonia nitrogenous wastewater of the utility model is cooperateed with flue gas of refuse burning NOx pollutants in the system administered
The sludge plate compression liquid that high-concentration ammonia nitrogenous wastewater produces for the sludge after thermophilic digestion after plate and frame filter press, institute
The H contained2S, the gas such as HCN content after pre-processing module high temperature anaerobic and pH are adjusted is few.In addition, sludge field plate frame pressing filtering liquid
The ammonia vol produced through ammonia aeration and absorption tower is big, and the ammonia concn of SNCR denitration requirement is 5% or so in waste incinerator
Can, therefore, the ammonium hydroxide that system ultimately produces requires no matter all meeting waste incinerator SNCR denitration from quantity or quality.It is dirty
Mud field and garbage burning factory distance are very near, on the one hand can directly utilize ammonium hydroxide, it is subsequently sharp to solve system accessory substance ammonium hydroxide
The problem of using；On the other hand solves the problem of sludge press filtration liquefied ammonia nitrogen content is high, and qualified discharge is difficult；Save rubbish at the same time
In addition incineration plant purchases the expense of out of stock reducing agent.
3rd, anaerobic sludge pressing filtering liquid water quality NH3- N content generally in 1000-2000mg/l, belongs to high-concentration ammonia nitrogenous wastewater.
Denitrogenation is in an important link in sewage disposal in itself, and the qualified discharge of ammonia nitrogen is difficult to realize using single technique.This
The high-concentration ammonia nitrogenous wastewater of utility model cooperates with the scheme for the system administered with flue gas of refuse burning NOx pollutants and uses two-stage
Ammonia-nitrogen stripping tower series operation, every grade of stripping tower arranges two layers of filler, tune pH ponds is set before stripping tower, and bottom of towe arranges air distribution plate,
One, which can improve ammonia nitrogen in waste water, dissociates, and increases free ammonia ratio；Two can at utmost ensure that gas-liquid uniformly comes into full contact with, and ensure
The ammonia of free state can all be blown out, and into absorption tower, the ammonia-nitrogen content in waste water be greatly lowered, and coordinate follow-up digestion anti-
Denitrogenation is nitrified, can realize ammonia nitrogen qualified discharge after sewage disposal.
4th, the high-concentration ammonia nitrogenous wastewater of the utility model cooperates with ammonia in the system administered with flue gas of refuse burning NOx pollutants
Nitrogen absorption tower sprays the arrangement of demineralized water by two layers of filler, two layers of liquid distribution trough, at utmost increases ammonia and demineralized water
Contact area, is conducive to absorption of the demineralized water to ammonia.Set ammonia circulation to pump inside absorption tower at the same time, pass through cyclic absorption mistake
Journey makes ammonia concn in tower constantly increase, but final ammonia concn can only achieve on the premise of denitrogenation of waste water effect is ensured
10%-15%.Ammonium hydroxide made of such a method is extremely difficult to ammonia (NH in industrial ammonia3) content >=20% (or >=25%) will
Ask, ammonium hydroxide transport and the requirement limitation of storage are more, and outward transport formality is complicated and there are a large amount of security risks, this method generation product ammonia
The later use of water is also a big difficult point.Same garden garbage burning factory flue gas SNCR denitration reducing agent is accordingly acted as, can be very
Good solves the problems, such as high concentration ammonia nitrogen sewage processing system accessory substance ammonium hydroxide later use.
5th, the utility model high-concentration ammonia nitrogenous wastewater cooperates with the system administered not only to fit with flue gas of refuse burning NOx pollutants
For anaerobic sludge pressing filtering liquid, landfill leachate may be equally applicable for by process optimization, the value with marketing, energy
Improve the economical operation benefit of burning power plant.
Brief description of the drawings
Fig. 1 is principle schematic of the utility model in concrete application example.
Marginal data：
1st, pH ponds are adjusted；201st, first order ammonia-nitrogen stripping tower；202nd, second level ammonia-nitrogen stripping tower；3rd, absorption tower；4th, ammonium hydroxide is molten
Liquid fills pump unit；5th, ammonia spirit holding vessel unit；6th, ammonia spirit conveying pump unit；7th, soft water conveying pump unit；8th, it is soft
Water store tank unit；9th, mixed allocation unit；10th, compressed air allocation unit；11st, sprayer unit.
Embodiment
The utility model is described in further details below with reference to Figure of description and specific embodiment.
The technical solution of the utility model is based on following technical principle：
Ammonia nitrogen in water, it is most of with ammonium ion (NH4 +) and free ammonia (NH3) keep the state of balance and exist.It is flat
Weighing apparatus relation is as follows：This equilibrium relation is influenced by pH value, when the ph is increased, balance
Move right, the ratio increase of free ammonia.During room temperature, when pH value is 7 or so, ammonia nitrogen exists with ammonium ion state mostly, works as pH
Be worth for 11 or so when, free ammonia substantially accounts for 90%.Blow-off method is theoretical according to gas-liquid phase equilibrium and mass transfer velocity, is determined using Henry
Rule, air is passed through in waste water, is changed toxic and harmful gas and is dissolved in the water established vapor-liquid equilibrium relationship, these is easily waved
Stimulating food matter switchs to gas phase by liquid phase, is then collected or is diffused into air.Ammonia-nitrogen stripping tower generally uses double tower string
Through transport row, to improve the recycling concentration of ammonia, and installs ammonia nitrogen absorption tower behind stripping tower, leads to the ammonia nitrogen exhaust gas that stripping comes out
Cross after the processing of absorption tower and air is discharged into by upper end exhaust tube as pure air.Demineralized water is sprayed in absorption tower, is occurred as follows
Reaction：Burnt in the ammonia circulation of generation to 10%-15% concentration ranges available for rubbish
Burn kiln gas SNCR denitration.
SNCR denitration (selective non-catalytic reduction) is that the reducing agent such as solution such as ammonium hydroxide, urea is sprayed into fire box temperature to be
850 DEG C -1150 DEG C of region, under no catalyst action, reducing agent rapid thermal decomposition goes out NH3And carried out with the NOx in flue gas
Reaction generation N2And H2O.This method, can be by carrying out transformation realization using burner hearth as reactor to boiler.In suitable temperature province
Interior, the key reaction formula using ammonium hydroxide as reducing agent is：4NH3+4NO+O2→4N2+6H2O.SNCR denitrating flue gas efficiency is generally
30%~80%, influenced by boiler structure size very big.SNCR system denitrating flue gas processes are complete by following four basic process
Into：Receive and store reducing agent；Reducing agent after the injection dilution of boiler suitable position；The metering of reducing agent is exported, mixed with water
Close dilution；Reducing agent is mixed with flue gas carries out denitration reaction.
Technical principle based on more than, the utility model proposes a kind of high-concentration ammonia nitrogenous wastewater and flue gas of refuse burning
The system that the collaboration of NOx pollutants is administered, it is to be inhaled using this high-concentration ammonia nitrogenous wastewater of sludge press filtration liquid through two-stage ammonia aeration+ammonia
The ammonium hydroxide that 10%-15% concentration is made is received, for the reduction medicament of waste incinerator SNCR denitration, ammonia nitrogen in high density is realized and gives up
Both pollutants cooperate with improvement to water with NOx in flue gas of refuse burning.
As shown in Figure 1, the high-concentration ammonia nitrogenous wastewater of the utility model cooperates with what is administered with flue gas of refuse burning NOx pollutants
System, including：Adjust pH ponds 1, first order ammonia-nitrogen stripping tower 201, second level ammonia-nitrogen stripping tower 202, absorption tower 3 and SNCR denitration system
System.PH ponds 1 are adjusted to be used for adjusting the pH value of ammonia nitrogen waste water, first order ammonia-nitrogen stripping tower 201, second level ammonia-nitrogen stripping tower 202 are connected
Operation, to ensure that the ammonia of free state can all be blown out, into absorption tower 3.
Thermophilic digestion sludge can produce sludge plate compression liquid, pressing filtering liquid water quality NH after plate and frame filter press3-N
Content is generally in 10002000mg/l.Ammonia nitrogen waste water initially enters pH regulating reservoirs 1 and carries out adjusting pH to 11, then through waste water transfer pump
The liquid distribution trough of first order ammonia-nitrogen stripping tower 201 is squeezed into, while air enters first order ammonia nitrogen under the action of centrifugal blower
Air inlet below 201 tower body of stripping tower, and air inlet section space is full of, under the action of the air distribution plate of stripping tower lower part, there is pressure wind
It is uniformly distributed and then even pressure rises to two layers of packing section.On the surface of filler, air blows out the ammonia of free state, by tower body
Upper air vent drains into absorption tower 3.Enter recovery pond by the waste water of first order ammonia-nitrogen stripping tower 201, by recovered liquid transfer pump
The liquid distribution trough on 202 top of second level ammonia-nitrogen stripping tower is squeezed into, the air being sent into lower section centrifugal blower inversely contacts, ammonia
Desorption drains into 3 lower section air inlet of absorption tower by tower body upper air vent from waste water.Ammonia is sprayed with this tower spray tube in absorption tower 3
The absorbing liquid demineralized water reaction generation ammonium hydroxide gone out, the pure air after processing are discharged by absorption tower top exhaust tube, ammonia nitrogen waste water
Sewage subsequent processing units are discharged into after two-stage ammonia aeration to continue with, and are discharged after up to standard.
Ammonia circulation in absorption tower 3 is to can be used for incinerator SNCR denitration system when a certain concentration (10%-15%).
In concrete application example, the SNCR denitration system of the utility model includes ammonia spirit filling pump unit 4, ammonia spirit holding vessel
Unit 5, ammonia spirit conveying pump unit 6, soft water conveying pump unit 7, soft water holding vessel unit 8, mixed allocation unit 9, compression
Air distribution unit 10, sprayer unit 11, control system 12.Wherein：
Ammonia spirit fills pump unit 4, is local operation using two centrifugal pumps (the using and the reserved), the operation and storage of pump
The detection of tank overflow protection is connected, equipped with delivery gauge, safety valve and inlet filter etc..Effect is by 15% or so ammonium hydroxide
It is sent into ammonia spirit holding vessel unit 5.
Ammonia spirit holding vessel unit 5, is designed using 304 stainless steels, and dischargeable capacity ensures 3 stoves storage of 3 days, is furnished with
Magnetic double level gauge and emptying flusher, there is bound liquid level alarm device.
Soft water holding vessel unit 8, is designed using stainless steel 304, by soft water conveying pump unit 7, soft water holding vessel
Unit 8 is the storage tank with Liquid level, and the protection of the low liquid level with pump.
Soft water conveys pump unit 7, containing 2 centrifugal pumps, the using and the reserved, soft water pumpout module be will dilution reducing agent to appropriate
The softened water pressurized delivered of concentration is to mixed allocation unit 9.
Mixed allocation unit 9, for controlling urea and the quantitative mixing of soft water and fixed direction allocation, every incinerator prepares 2
Platform distribution module, for 20 spray guns of incinerator.Reducing agent and water are mixed to suitable concentration and met by mixed allocation unit 9
At present under service condition consumption requirement.
Compressed air allocation unit 10, corresponding mixed allocation unit 9, for consideration easy for installation, compressed air distribution is single
Member 10 will be arranged close to above the front wall or steelframe of spray gun position, and compressed air allocation unit 10 is managed collectively.
Sprayer unit 11, using the special telescopic injector of import denitration, is two fluid-type injectors, connects mixing respectively
(compressed air plays the role of atomization to the reducing agent and station-service compressed air that the module of distribution single 9 is sent out in injection, in stop-spraying
When be cooling effect).Injector is connected by flexible hose with reducing agent pipeline and compressed air pipe, and whole injector stretches
Formula is installed on the support tube welded on furnace wall cooling, and SNCR denitration system, which is divided two layers, in the stove of every waste heat boiler uses 20
Root nozzle, is arranged in the front wall and left and right sides water-cooling wall of the first flue of boiler, while reserved one plane of third layer (is opened
10 holes) as spare.
Control system is the independent fully automatic operation system to communicate with whole factory's DCS system.When occurring unexpected, system will be reported
Warn and shut down.The monitoring signal of all control systems can be shown in whole factory DCS.
Workflow of the utility model in concrete application example be：
S1：Pressing filtering liquid water quality NH3- N content generally in 10002000mg/l, ammonia nitrogen waste water initially enter pH regulating reservoirs 1 into
Row adjusts pH：10-12 (being preferably 11), then squeezes into the liquid distribution trough of first order ammonia-nitrogen stripping tower 201 with pump；
S2：Air enters air inlet below the tower body of first order ammonia-nitrogen stripping tower 201 under the action of centrifugal blower, and
Full of air inlet section space, then even pressure rises to packing section.Waste water is thus lifted to the tower top of packed tower, and is distributed to the whole of filler
A surface, by filler toward flowing down, with gas reverse flow, air blows out the ammonia of free state, by tower body upper air vent
Drain into absorption tower 3.
In the preferred embodiment, to make the ammonia nitrogen in waste water thoroughly blow out, the utility model further comprises the steps：
S3：Ammonia nitrogen waste water enters recovery pond after a stripping, this process is circulated into second level ammonia-nitrogen stripping tower 202,
The ammonia of blowout is again introduced into absorption tower 3.The absorbing liquid demineralized water reaction that ammonia is sprayed with this tower spray tube in absorption tower 3 generates
Ammonium hydroxide, is allowed to constantly contact with ammonia inside absorption tower 3 through circulating pump circulation, and ammonia concn increase, is recycled to a certain concentration
When (10%-15%) discharge.Demineralized water supplement all the way is connect on ammonia circulation pipeline, rationally control supplement water water, arranges ammonium hydroxide
Output is in dynamic balance state with demineralized water magnitude of recruitment.
S4：Pure air after processing is by the top exhaust tube discharge on absorption tower 3, and ammonia nitrogen waste water is through two-stage ammonia aeration heel row
Enter sewage subsequent processing units to continue with, discharged after up to standard.
In the above-described embodiments, to improve the flood rate of ammonia in wastewater, while ensure to generate the concentration of ammonium hydroxide, key
Place is that：
1st, by two-stage ammonia-nitrogen stripping tower series operation, ensureing the ammonia of free state can all blow out, into absorption tower.
2nd, it will all arrange two layers of filler per level-one stripping tower, and using counter-current operation, gas liquid interfacial area be improved, so that favorably
Desorbed in ammonia from waste water.
3rd, the ammonia nitrogen in water, it is most of with ammonium ion (NH4+) and free ammonia (NH3) keep the state of balance and exist.Its
Equilibrium relation is as follows：When pH value is high, balance moves right, the large percentage of free ammonia,
When pH value is 11 or so, free ammonia accounts for 90%.Therefore, the utility model is further arranged before ammonia nitrogen waste water enters stripping tower
One is adjusted pH ponds 1, and pH is transferred to 11 or so, can improve the ammonia nitrogen rate of dissociation and operational effect be affected by temperature it is smaller.
Further, in the preferred embodiment, centrifugal blower ammonia-nitrogen stripping tower bottom air inlet supplied all uses
Frequency conversion, adjusts supply air quantity by export the breeze door, finds optimal liquid-gas ratio, desorbed beneficial to ammonia from waste water, while power saving section
Energy.
Further, in the preferred embodiment, absorption tower 3 is arranged using two layers of filler, and two layers of liquid distribution trough spray removes
Brine, at utmost increases ammonia and demineralized water contact area, is conducive to absorption of the demineralized water to ammonia.
Further, in the preferred embodiment, the inside of absorption tower 3 sets ammonia circulation to pump, and is made by cyclic absorption process
Ammonia concn constantly increases in tower, until concentration reaches 10%-15%.
Further, in the preferred embodiment, the utility model is by controlling demineralized water magnitude of recruitment, water spray and absorption
3 bottom ammonium hydroxide discharge rate of tower, ensures the assimilation effect of ammonia and the discharge concentration of final ammonium hydroxide.
Further, in the preferred embodiment, can when the ammonia circulation in absorption tower 3 is to a certain concentration (10%-15%)
For incinerator SNCR denitration system.Ammonium hydroxide is pumped into ammonia spirit holding vessel unit 5 through filling, and ammonia spirit is by ammonia in storage tank
Aqueous solution conveying pump unit 6 is sent into mixed allocation unit 9, and soft water is using garbage incinerating power plant demineralized water by soft water delivery pump list
Member 7 is sent into mixed allocation unit 9.Soft water and ammonia spirit are in 9 Rigen of mixed allocation unit according to NOxIt is quantitative to discharge value of feedback realization
Mix, ammonium hydroxide is sprayed into apart from long (erosion opposite water after the injection flow switch inside mixed allocation unit 9 can prevent dilution
Cold wall pipe), while it is also possible to prevent the adverse effect to denitration effect and spray gun of the too small generation of ammonia water spray flow.Ammonium hydroxide and
After soft water realizes quantitative mixing and fixed direction allocation in mixed allocation unit 9, sprayer unit 11 is sent into by the pressure head of pump,
Spray gun sections of atomization realizes atomization, while also can adjust atomization length manually according to lance ejection situation.Injector annex is included only
Valve, direct-operated regulator and manual ball valve are returned, atomization air pressure is controlled in 1~3bar.The ammonia concn sprayed into burner hearth exists
5% or so, SNCR denitration is carried out, i.e., weak aqua ammonia is produced with incinerator burning under the conditions of optimal temperature (950 DEG C -1050 DEG C)
Flue gas in reaction of nitrogen oxides, generate nitrogen and water, key reaction it is as follows：4NH3+4NO+O2→4N2+6H2O, makes flue gas
In amount of nitrogen oxides control within discharge standard.
In a specific construction practice, conventional garbage incineration plant flue gas SNCR denitration more using purchase 20% (or
25%) concentration ammonium hydroxide or urea solid particle are smaller to equipment pollution because urea shipping storage is more convenient as reducing agent,
Consider that current trend is to be used as reducing agent instead of ammonium hydroxide by the use of urea for secure context.Now taken off using buying urea as SNCR
Exemplified by nitre reducing agent, newly-increased ammonia preparation system from urea is needed compared to ammonium hydroxide, while the urea bought is solid particle, urea liquid is matched somebody with somebody
Tank unit processed needs adapted electric block+vacuum feeding, hopper and operating platform staircase, blender, electric heater compared to ammonium hydroxide
Deng early period once invests more.Consider from later stage economical operation benefit, urea unit price is 2000 yuan/ton or so, is considered
Operation cost is 3.37 yuan/ton of rubbish, than ammonium hydroxide expense higher.When urea is as reducing agent, NOx removal rates are 30%-45%
Left and right, flue gas of refuse burning NOx pollutant emissions meet standard requirement.
By the use of ammonium hydroxide as SNCR denitration reducing agent, considering from economic benefit, the ammonium hydroxide unit price of 20% concentration is 900 yuan/ton,
Comprehensive operation cost is 2.9 yuan/ton of rubbish, and expense is in contrast lower.NOx removal rates are for 70%-85% or so, denitration efficiency
It is high, it is clear that ammonium hydroxide effect is more preferable.But from safety considerations, liquefied ammonia belongs to Class B dangerous material, the building requirements to storing workshop
It is high；To be said from buying angle, the buying and transport of liquefied ammonia are there are larger difficulty, and same incineration flue gas amount carries out SNCR denitration,
The cost of transportation of ammonium hydroxide is far above urea.
With reference to the utility model embodiment as can be seen that the utility model directly utilizes anaerobism in same fixed-end forces garden
Sludge press filtration liquid is used as garden waste incineration and generating electricity by two-stage ammonia aeration+ammonium hydroxide of 10%-15% concentration made of absorption tower 3
The reducing agent of factory's SNCR denitration, has evaded use ammonium hydroxide as reducing agent compared to major defect existing for urea well.One
It is to solve difficulty present in buying and transportational process, eliminates cost of transportation, also save the expense of medicament in itself；Second,
The area in storage workshop is greatly reduced, only need to store a small amount of ammonium hydroxide as spare medicament.Pass through the ammonium hydroxide mixing point in system
Ammonium hydroxide is diluted to 5% or so concentration with unit can meet denitration requirement, expire flue gas of refuse burning NOx pollutant emissions
Sufficient standard requirement.The utility model has been indicated above in comprehensive fixed-end forces garden (sewage, sludge, waste incineration and generating electricity) collaboration
Handling high-concentration ammonia nitrogenous wastewater and flue gas of refuse burning NOx pollutants has scheme reasonability, technical feasibility, can realize resource
Comprehensive utilization, improves on-road efficiency.
It the above is only the preferred embodiment of the utility model, the scope of protection of the utility model is not limited merely to above-mentioned
Embodiment, all technical solutions belonged under the utility model thinking belong to the scope of protection of the utility model.It should be pointed out that pair
For those skilled in the art, some improvements and modifications under the premise of the utility model principle is not departed from,
It should be regarded as the scope of protection of the utility model.
Claims (5)
1. a kind of high-concentration ammonia nitrogenous wastewater cooperates with the system administered with flue gas of refuse burning NOx pollutants, it is characterised in that bag
Include：Adjust pH ponds (1), first order ammonia-nitrogen stripping tower (201), second level ammonia-nitrogen stripping tower (202) and absorption tower (3), the tune pH
Pond (1) is used for adjusting the pH value of ammonia nitrogen waste water, the first order ammonia-nitrogen stripping tower (201), second level ammonia-nitrogen stripping tower (202) string
Through transport row, enables the ammonia of free state all to blow out, into absorption tower (3)；The interior ammonia of the absorption tower (3) and this tower spray tube
The absorbing liquid demineralized water reaction generation ammonium hydroxide of ejection, is allowed to continuous with ammonia in the absorption tower (3) inside through circulating pump circulation
Contact, ammonia concn increase, is discharged when being recycled to a certain concentration；Pure air after processing is by absorption tower (3) top exhaust tube
Discharge.
2. high-concentration ammonia nitrogenous wastewater according to claim 1 cooperates with the system administered with flue gas of refuse burning NOx pollutants,
It is characterized in that, it is sent into after ammonia circulation in the absorption tower (3) and is used for incinerator SNCR denitration system.
3. high-concentration ammonia nitrogenous wastewater according to claim 2 cooperates with the system administered with flue gas of refuse burning NOx pollutants,
It is characterized in that, the SNCR denitration system includes：
Ammonia spirit filling pump unit (4), for ammonium hydroxide is sent into ammonia spirit holding vessel unit (5)；
Ammonia spirit holding vessel unit (5), for being stored to ammonium hydroxide；
Soft water holding vessel unit (8), it is other installed in soft water conveying pump unit (7)；
Soft water conveying pump unit (7), for will dilution reducing agent to the softened water pressurized delivered of debita spissitudo to mixed allocation list
First (9)；
Mixed allocation unit (9), for controlling urea and the quantitative mixing of soft water and fixed direction allocation, mixed allocation unit (9) will
Reducing agent and water are mixed to a certain concentration；
Compressed air allocation unit (10), is correspondingly arranged with mixed allocation unit (9)；
Sprayer unit (11), connects reducing agent and station-service compressed air that the module of mixed allocation unit (9) is sent out respectively；
Control system, for being controlled to above-mentioned each component.
4. high-concentration ammonia nitrogenous wastewater according to claim 3 cooperates with the system administered with flue gas of refuse burning NOx pollutants,
It is characterized in that, the ammonia spirit holding vessel unit (5) is equipped with magnetic double level gauge and is vented flusher, and with up and down
Limit liquid level alarm device.
5. high-concentration ammonia nitrogenous wastewater according to claim 3 cooperates with the system administered with flue gas of refuse burning NOx pollutants,
It is characterized in that, the injector in the sprayer unit (11) passes through flexible hose and reducing agent pipeline and compressed air pipe
It is connected, on the telescopic support tube welded on furnace wall cooling of whole injector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721288038.9U CN207361825U (en) | 2017-09-30 | 2017-09-30 | A kind of high-concentration ammonia nitrogenous wastewater cooperates with the system administered with flue gas of refuse burning NOx pollutants |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721288038.9U CN207361825U (en) | 2017-09-30 | 2017-09-30 | A kind of high-concentration ammonia nitrogenous wastewater cooperates with the system administered with flue gas of refuse burning NOx pollutants |
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| Publication Number | Publication Date |
|---|---|
| CN207361825U true CN207361825U (en) | 2018-05-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107585815A (en) * | 2017-09-30 | 2018-01-16 | 浦湘生物能源股份有限公司 | A kind of high-concentration ammonia nitrogenous wastewater cooperates with the method and system administered with flue gas of refuse burning NOx pollutants |
| CN109173665A (en) * | 2018-09-05 | 2019-01-11 | 襄阳龙蟒钛业有限公司 | A kind of method of CFB boiler denitration |
| CN110772962A (en) * | 2019-11-29 | 2020-02-11 | 北京京城环保股份有限公司 | Method for denitration of waste incineration flue gas by ammonia in waste leachate |
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2017
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107585815A (en) * | 2017-09-30 | 2018-01-16 | 浦湘生物能源股份有限公司 | A kind of high-concentration ammonia nitrogenous wastewater cooperates with the method and system administered with flue gas of refuse burning NOx pollutants |
| CN109173665A (en) * | 2018-09-05 | 2019-01-11 | 襄阳龙蟒钛业有限公司 | A kind of method of CFB boiler denitration |
| CN110772962A (en) * | 2019-11-29 | 2020-02-11 | 北京京城环保股份有限公司 | Method for denitration of waste incineration flue gas by ammonia in waste leachate |
| CN110772962B (en) * | 2019-11-29 | 2021-11-30 | 北京京城环保股份有限公司 | Method for denitration of waste incineration flue gas by ammonia in waste leachate |
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