CN110201527A - A kind of pre- spray ammonia system and technique of active carbon desulfurization denitration - Google Patents
A kind of pre- spray ammonia system and technique of active carbon desulfurization denitration Download PDFInfo
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- CN110201527A CN110201527A CN201910611433.3A CN201910611433A CN110201527A CN 110201527 A CN110201527 A CN 110201527A CN 201910611433 A CN201910611433 A CN 201910611433A CN 110201527 A CN110201527 A CN 110201527A
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- ammonia
- active carbon
- presaturation
- storehouse
- adsorption tower
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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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
- B01D53/04—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 by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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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
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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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
Abstract
The present invention provides the pre- spray ammonia system and technique of a kind of active carbon desulfurization denitration, the pre- spray ammonia system includes: pre- ammonia-gas spraying device, the pre- ammonia-gas spraying device includes ammonia presaturation storehouse, the activated carbon adsorption being pre-set in ammonia presaturation storehouse enters the ammonia in ammonia presaturation storehouse, to obtain ammonia presaturation active carbon；Adsorption tower, the adsorption tower are provided with active carbon entrance, and the ammonia presaturation active carbon from the pre- ammonia-gas spraying device enters the adsorption tower through the active carbon entrance, and the adsorption tower is reacted for flue gas desulfurization and denitrification.The pre- spray ammonia process of active carbon desulfurization denitration of the invention is combined using ammonia presaturation device and spray ammonia section, form a kind of combination and cooperation denitrating technique, ammonia presaturation processing is carried out to it before active carbon enters adsorption tower, further increase denitration efficiency, it can control the escaping of ammonia again, ammonia consumption is saved simultaneously, improves economy.
Description
Technical field
The invention belongs to active carbon desulfurization denitration technical field of processing equipment, and in particular to a kind of active carbon desulfurization denitration
Pre- spray ammonia system and technique.
Background technique
Currently, active carbon desulfurization denitrification integral technology is widely used in coking industry, metallurgy industry (sintering machine, pelletizing)
Etc. smokes.The integrated fumes such as desulphurization denitration dedusting purification function and Sulphur ressource may be implemented in the technology
Change.But with the raising of discharge standard, especially super minimum discharge standard will be implemented, SO2, NOX, dust emission concentration
Require 35,50,10 raisings to 20,30,5mg/Nm by original3, active carbon desulfurization denitrification integral technology is proposed higher
It is required that.
What existing active carbon desulfurization denitrification integral technology denitration used at present is all in inlet flue gas or desulfurization bed
Ammonia is sprayed in flue gas after layer, the NO after flue gas and ammonia mixing, into active carbon bed, in flue gasXAmmonia with penetrating is in activity
Under the catalytic action of charcoal, reduction reaction occurs, generates N2And water, to achieve the purpose that denitration.The chemical reaction of generation is as follows:
6NO+4NH3→5N2+6H2O
NO2+NO+2NH3→2N2+3H2O
4NO+4NH3+O2→4N2+6H2O
2NO2+4NH3+O2→3N2+6H2O
As outlet NOXDischarge standard improves, and in order to improve denitration efficiency, needs to increase ammonia spraying amount, but thus bring
Problem is that the escaping of ammonia increases；The simple ammonia spraying amount that increases causes a part while can improve denitration efficiency to a certain extent
Ammonia cannot be tightly held by activated carbon in time, the result is that draining into atmosphere as flue gas is carried over, the escaping of ammonia be caused to increase.
Therefore, in order to meet the denitration requirement of super minimum discharge, while also to meet the environmental requirement of the escaping of ammonia, need one
Kind can improve denitration efficiency and increase the technology and system for desulfuration and denitration of the escaping of ammonia.
Accordingly, it is desirable to provide a kind of be directed to the insufficient improved technology scheme of the above-mentioned prior art.
Summary of the invention
The purpose of the present invention is to provide the pre- spray ammonia systems and technique of a kind of active carbon desulfurization denitration, for ultralow row
The requirement put reaches the active carbon desulfurization denitrating system and technique for improving denitration efficiency while not increasing amount of ammonia slip.
A kind of pre- spray ammonia system of active carbon desulfurization denitration, the pre- spray ammonia system include:
Pre- ammonia-gas spraying device, the pre- ammonia-gas spraying device include ammonia presaturation storehouse, are pre-set in ammonia presaturation storehouse
Activated carbon adsorption enters the ammonia in ammonia presaturation storehouse, to obtain ammonia presaturation active carbon；
Adsorption tower, the adsorption tower are provided with active carbon entrance, and the ammonia presaturation from the pre- ammonia-gas spraying device is living
Property charcoal through the active carbon entrance enter the adsorption tower, the adsorption tower for flue gas desulfurization and denitrification reaction.
In the pre- spray ammonia system of active carbon desulfurization denitration as described above, it is preferable that the pre- spray ammonia system further includes for ammonia
Device, it is described to provide ammonia into ammonia presaturation storehouse and the adsorption tower for ammonia device.
In the pre- spray ammonia system of active carbon desulfurization denitration as described above, it is preferable that the pipeline of the ammonia presaturation the top of the warehouse
On be provided with the first sealing valve, active carbon is entered in ammonia presaturation storehouse by first sealing valve；The ammonia presaturation
The second sealing valve is provided on the pipeline of the bottom in storehouse, the ammonia presaturation active carbon is drawn off by second sealing valve；
Preferably, nitrogen has been passed through in the exit of the inlet of first sealing valve and second sealing valve；
More preferably, first sealing valve and the second sealing valve are rotary seal valve.
In the pre- spray ammonia system of active carbon desulfurization denitration as described above, it is preferable that the pre- ammonia-gas spraying device is additionally provided with ammonia
The entrance of circulating fan, the ammonia circulating fan is connected to by first pipe with the top in ammonia presaturation storehouse, and the ammonia follows
The outlet of ring blower is connected to by second pipe with the lower part in ammonia presaturation storehouse, and ammonia is by the ammonia circulating fan in institute
State the inside and outside formation circulation in ammonia presaturation storehouse.
In the pre- spray ammonia system of active carbon desulfurization denitration as described above, it is preferable that it is dense to be provided with ammonia in the first pipe
Spend analyzer.
In the pre- spray ammonia system of active carbon desulfurization denitration as described above, it is preferable that it is described for ammonia device include aqua ammonia pump and
Ammonia evaporator, the aqua ammonia pump connect one end of the ammonia evaporator, and the other end of the ammonia evaporator is respectively connected to described
The lower part in ammonia presaturation storehouse and the adsorption tower；
The first regulating valve is provided on the pipeline that the aqua ammonia pump is connected with the ammonia evaporator；
The second regulating valve is provided on the pipeline that the ammonia evaporator is connected with ammonia presaturation storehouse.
In the pre- spray ammonia system of active carbon desulfurization denitration as described above, it is preferable that ammonia presaturation storehouse is provided with heating
Device；
Preferably, the heating device is steam companions heating；
More preferably, 135~145 DEG C of temperature are heated to ammonia presaturation storehouse.
In the pre- spray ammonia system of active carbon desulfurization denitration as described above, it is preferable that the pre- spray ammonia system further includes activity
Charcoal Analytic Tower is pre-set at the active carbon in ammonia presaturation storehouse from the active carbon Analytic Tower；Preferably, described
The active carbon of active carbon Analytic Tower enters ammonia presaturation storehouse by first sealing valve；
Preferably, the adsorption tower successively includes smoke inlet section, desulfurization bed, spray ammonia section, denitration bed from top to bottom
With active carbon cloth section.
A kind of pre- spray ammonia process of active carbon desulfurization denitration, the pre- spray ammonia process include the following steps:
Active carbon is placed in ammonia environment the progress ammonia presaturation processing in ammonia presaturation storehouse, obtained by step 1
Ammonia presaturation active carbon；
The ammonia presaturation active carbon is introduced into adsorption tower by step 2, at the same into the adsorption tower supply ammonia into
The reaction of row flue gas desulfurization and denitrification.
Preferably, the pre- spray ammonia process is completed using pre- spray ammonia system as described above, used in the step 1
Ammonia used in ammonia and step 2 is generated by for ammonia device；
The flue gas desulfurization and denitrification reaction refers to that the flue gas entered from the adsorption tower smoke inlet first passes around desulfurization bed
Desulfurization is realized after layer, and it is de- to react realization subsequently into denitration bed and under the catalysis of active carbon with the ammonia entered in adsorption tower
Nitre, then with the ammonia further progress denitration reaction that is adsorbed in the ammonia presaturation active carbon, after desulfurization and denitrification reaction
Flue gas from adsorption tower exhanst gas outlet be discharged.
In the pre- spray ammonia process of active carbon desulfurization denitration as described above, it is preferable that be provided with flue gas on the adsorption tower certainly
Dynamic monitoring system, monitors the NOx concentration of the adsorption tower smoke inlet and the adsorption tower exhanst gas outlet, dense by outlet drain
Degree program calculates the consumption of ammonia, automatic interlock control the first regulating valve for ammonia amount；
Preferably, according to the data of the ammonia density analyzer in the pre- ammonia-gas spraying device, automatic interlock control second is adjusted
Valve for ammonia amount；
Preferably, in the step 1, active carbon carries out the time of ammonia presaturation processing not in ammonia presaturation storehouse
Less than 40min.
Compared with the immediate prior art, technical solution provided by the invention has following excellent effect:
The pre- spray ammonia system and technique of active carbon desulfurization denitration of the invention have following excellent effect:
1, ammonia presaturation processing is carried out to it before active carbon enters adsorption tower, ammonia is equably adsorbed on active carbon in advance
On；So that NOx remaining in flue gas is quickly and efficiently reacted with the ammonia of uniform adsorption on the activated carbon, further increases
Denitration efficiency reaches super minimum discharge requirement NOx ≯ 30mg/Nm3。
2, ammonia presaturation device is provided in device, ammonia passes through ammonia presaturation device, table of the uniform adsorption in active carbon
It in face, can efficiently and rapidly react with the NOx in flue gas, while improving denitration efficiency, and can control the escaping of ammonia,
Ammonia consumption can be saved simultaneously, improve economy.
3, the spray ammonia section of ammonia presaturation device and routine is combined, forms a kind of combination and cooperation denitrating technique, further
Improve denitration efficiency.
4, the ammonia spraying amount in ammonia presaturation storehouse is adjusted according to the ammonia concentration analyzer of its gas vent；Active carbon
The ammonia presaturation residence time determines according to the internal circulating load of active carbon and the size of ammonia presaturation device, it is ensured that the surface of active carbon
Adsorb the saturation capacity of ammonia.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.Wherein:
Fig. 1 is that ammonia system structural schematic diagram is sprayed in the active carbon desulfurization denitration of the embodiment of the present invention in advance.
In figure: 1, Analytic Tower；2, ammonia presaturation storehouse；3, the first sealing valve；4, the second sealing valve；5, ammonia circulating fan；6,
Ammonia density analyzer；7, nitrogen；8, first pipe；9, second pipe；10, aqua ammonia pump；11, the first regulating valve；12, it second adjusts
Valve；13, ammonia evaporator；14, adsorption tower；141, smoke inlet section；142, desulfurization bed；143, ammonia section is sprayed；144, denitration bed；
145, active carbon cloth section.
Specific embodiment
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.It should be noted that in the feelings not conflicted
Under condition, the feature in embodiment and embodiment in the present invention be can be combined with each other.
In the description of the present invention, term " longitudinal direction ", " transverse direction ", "upper", "lower", "front", "rear", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom" is to be based on the orientation or positional relationship shown in the drawings, and is only
For ease of description the present invention rather than require the present invention that must be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.Term used in the present invention " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected,
It may be a detachable connection；It can be directly connected, can also be indirectly connected by intermediate member, for the common of this field
For technical staff, the concrete meaning of above-mentioned term can be understood as the case may be.
As shown in Figure 1, according to an embodiment of the invention, providing a kind of pre- spray ammonia system of active carbon desulfurization denitration, in advance
Spraying ammonia system includes:
For ammonia device, for ammonia device for providing ammonia, ammonia is used for the denitration reaction of flue gas, and carries out to active carbon
Ammonia presaturation processing；It include aqua ammonia pump 10 and ammonia evaporator 13 for ammonia device, aqua ammonia pump 10 connects one end of ammonia evaporator 13, ammonia
Water pump 10 extracts ammonium hydroxide to ammonia evaporator 13, forms ammonia, the other end of ammonia evaporator 13 is respectively connected to ammonia presaturation storehouse 2
The spray ammonia section 143 of lower part and adsorption tower 14, the ammonia into ammonia presaturation storehouse 2 carry out ammonia presaturation processing to active carbon, enter
The ammonia that adsorption tower 14 sprays ammonia section 143 participates in the denitration reaction of flue gas.
The first regulating valve 11 is provided on pipeline between aqua ammonia pump 10 and ammonia evaporator 13；It is extracted for controlling ammonium hydroxide
Amount；It is provided with the second regulating valve 12 on the pipeline that ammonia evaporator 13 and ammonia presaturation storehouse 2 connect, enters ammonia presaturation for controlling
The ammonia amount in storehouse 2.
Pre- ammonia-gas spraying device, pre- ammonia-gas spraying device include ammonia presaturation storehouse 2, active carbon and ammonia into ammonia presaturation storehouse 2
Ammonia presaturation processing is carried out, ammonia presaturation active carbon is obtained.
In a specific embodiment of the present invention, the active carbon after the regeneration of Analytic Tower 1 analytically passes through activity in the outlet of tower 1
Charcoal conveying device enters 2 entrance of ammonia presaturation storehouse, and active carbon enters in storehouse from the top in ammonia presaturation storehouse 2, ammonia presaturation Cang2Ding
The first sealing valve 3 is provided on the inlet duct in portion；Ammonia presaturation active carbon after processed is unloaded from the bottom in ammonia presaturation storehouse 2
Out, the second sealing valve 4 is provided on the outlet conduit of the bottom in ammonia presaturation storehouse 2；Preferably, the first sealing valve 3 and second is close
Sealing valve 4 is rotary seal valve, i.e. the first sealing valve 3 is the first rotary seal valve 3, and the second sealing valve 4 is the second rotatory sealing
Valve 4.Rotary seal valve is rotatory feeder valve, when rotatory feeder valve is used for pneumatic conveying powdery, fine granularity dry state material, is realized
Gas, even feeding function are locked, is suitable for the conveying of active carbon, can effectively realize and to the close of the gas in ammonia presaturation storehouse 2
Envelope.
In order to avoid ammonia leakage, prevents the ammonia in ammonia presaturation storehouse 2 from exploding, need anoxybiotic, it is close in the first rotation
The exit of the inlet and the second rotary seal valve 4 of sealing valve 3 has been passed through nitrogen 7；In order to make in ammonia presaturation storehouse 2 when being passed through
Ammonia and 7 mixed gas of nitrogen do not leak, rotatory sealing is set on the inlet duct and outlet conduit in ammonia presaturation storehouse 2
Valve, conveying active carbon make nitrogen 7 keep certain pressure simultaneously, it is preferable that active-carbon bed in nitrogen charging pressure and ammonia presaturation storehouse 2
Layer height is related；Active-carbon bed layer height is 2~5m；5 pressure head of ammonia circulating fan will overcome bed resistance；Ammonia presaturation storehouse 2
Nitrogen charging pressure is higher than pressure in storehouse；Wherein top nitrogen charging pressure is lower, and the pressure that nitrogen 7 is filled with the first rotary seal valve 3 is
500~1000Pa；Lower section nitrogen charging pressure is higher than 5 pressure head of ammonia circulating fan, and nitrogen 7 is filled with the pressure of the second rotary seal valve 4
For 1500~3000Pa；Guarantee that the gas in ammonia presaturation storehouse 2 does not leak.
In a specific embodiment of the present invention, pre- ammonia-gas spraying device is additionally provided with ammonia circulating fan 5, and ammonia circulating fan 5 enters
Mouth is connected to by first pipe 8 with the top in ammonia presaturation storehouse 2, and the outlet of ammonia circulating fan 5 is pre- full by second pipe 9 and ammonia
It is connected to the lower part in storehouse 2, ammonia is recycled by ammonia circulating fan 5 in the inside and outside formation in ammonia presaturation storehouse 2.
It is rotated by 3 inlet of the first rotary seal valve and second on 2 inlet duct of ammonia presaturation storehouse and outlet conduit
4 exit of sealing valve carries out nitrogen filled protection to ammonia presaturation storehouse 2, and the ammonia into ammonia presaturation storehouse 2 passes through activity from bottom to top
Charcoal, active carbon carry out physical absorption to ammonia, suck in the hole of activated carbon surface, unadsorbed ammonia and nitrogen 7 pass through ammonia
Circulating fan 5 forms circulation and reenters ammonia presaturation storehouse 2, is further adsorbed by active carbon, passes through 7 gaseous mixture of ammonia and nitrogen
Body constantly recycles in ammonia presaturation storehouse 2, to improve the ammonia adsorption saturation amount of active carbon ammonia gas absorption rate and active carbon, makes to live
Property charcoal close to ammonia adsorption saturation, improve denitration efficiency；After adsorption saturation, ammonia presaturation active carbon passes through 2 bottom of ammonia presaturation storehouse
Outlet conduit draw off by the second rotary seal valve 4, by active carbon conveying device, be delivered to the activity at 14 top of adsorption tower
Charcoal cloth section 145.
Wherein, active carbon carries out the residence time of ammonia presaturation processing according to the circulation of active carbon in ammonia presaturation storehouse 2
It measures with the size in ammonia presaturation storehouse 2 and determines.Following for active carbon is determined according to the concentration of nitrogen oxides in effluent and oxysulfide
Circular rector determines the size bulk in ammonia presaturation storehouse 2 according to active carbon internal circulating load.Preferably, active carbon is in ammonia presaturation storehouse 2
The interior residence time is not less than 40min, it is ensured that activated carbon surface is adsorbed with the ammonia of saturation capacity.
In a specific embodiment of the present invention, it is provided with ammonia density analyzer 6 in first pipe 8, is circulated throughout for monitoring
The ammonia density that reaction is had neither part nor lot in journey, by the second regulating valve 12 control enter ammonia presaturation storehouse 2 inside for ammonia amount.
In a specific embodiment of the present invention, in order to prevent ammonia presaturation activated carbon surface absorption ammonia conveying and into
Enter adsorption tower 14 to be desorbed in the process, is provided with heating device (not shown) below ammonia presaturation storehouse 2, it can be to ammonia
It is heated in presaturation storehouse 2, it is preferable that heating device is steam tracing heating, and the periphery in ammonia presaturation storehouse 2 is provided with steam
Heat tracing pipe can carry out tracing thermal-insulating to ammonia presaturation storehouse 2, be heated to 135~145 DEG C of temperature to ammonia presaturation storehouse 2, guarantee to live
Property charcoal is not desorbed during transportation.
Adsorption tower 14, adsorption tower 14 from top to bottom successively include smoke inlet section 141, desulfurization bed 142, spray ammonia section 143,
Denitration bed 144 and active carbon cloth section 145.Flue gas enters the smoke inlet of 14 bottom of adsorption tower by adsorption tower smoke inlet
Section 141, then rises to desulfurization bed 142, first passes through desulfurization bed 142 and carries out desulphurization reaction, for the desulphurization reaction of flue gas
The existing any sulfur removal technology in this field can be used and carry out desulfurization, scrubbing CO_2；Flue gas after desulphurization reaction enters spray
Ammonia section 143, flue gas are mixed with the ammonia come is injected into, and then rise to denitration bed 144 together, under the catalysis of active carbon,
NOx in ammonia and flue gas is chemically reacted, and generates nitrogen, carries out denitration reaction；But still suffer from remnants' in flue gas
NOx, top-down ammonia presaturation active carbon enter active carbon cloth section 145, and remaining NOx is being adsorbed with ammonia in flue gas
Activated carbon surface quickly reacts and generates nitrogen and water again, and the NOx in flue gas is further removed, by desulfurization and denitrification reaction
Flue gas afterwards is discharged from adsorption tower exhanst gas outlet, after the denitration reaction of active carbon, improves flue gas entirety denitration efficiency, with
Just reach super minimum discharge standard.
It is provided on adsorption tower 14 CEMS (flue gas automatic monitored control system), monitoring adsorption tower smoke inlet and absorption tower flue gas
The NOx concentration of outlet is calculated automatically by outlet drain concentration schedule according to the NOx concentration shown on CEMS and needs to consume
Ammonia total amount, then by setting aqua ammonia pump 10 and ammonia evaporator 13 between 11 interlocked control of the first regulating valve always for ammonia
Amount；According to the measurement result of ammonia density analyzer 6, the unadsorbed ammonia recycle amount in pre- ammonia-gas spraying device is obtained, is adjusted by second
The adjustable ammonia of interlocked control of section valve 12 is input to the ammonia amount in ammonia presaturation storehouse 2；Ammonia prepared by ammonia evaporator 13
A part enters spray ammonia section 143 and participates in denitration reaction, and another part is delivered to the lower entrances in ammonia presaturation storehouse 2, into storehouse
It is adsorbed on activated carbon surface, ammonia presaturation processing is carried out to active carbon.
The pre- ammonia-gas spraying device being arranged in the pre- spray ammonia system of active carbon desulfurization denitration of the invention be in adsorption tower 14
143 combined denitration of ammonia section, which is sprayed, as the assistant reinforcement technique of further denitration reaches the emission request of ultralow denitration.
A kind of pre- spray ammonia process of active carbon desulfurization denitration of the invention, the pre- ammonia process that sprays include the following steps:
Step 1: opening the first regulating valve 11, ammonia is prepared by ammonia evaporator 13, ammonia a part is delivered to adsorption tower
14 spray ammonia section 143 controls transmission process by controlled valve, and it is anti-to participate in denitration with the flue gas entered from 14 bottom of adsorption tower
It answers, another part is passed through ammonia presaturation storehouse 2, and the ammonia of preparation initially enters ammonia presaturation storehouse 2, carries out ammonia presaturation to active carbon
Processing；
Step 2: opening the first sealing valve 3, and it is filled with nitrogen 7, by the first sealing valve 3 by active carbon from ammonia presaturation
The top in storehouse 2 enters in storehouse, carries out ammonia presaturation adsorption treatment with the ammonia entered from 2 lower part of ammonia presaturation storehouse；It opens simultaneously
Ammonia circulating fan 5 and heating device keep in storehouse 134~145 DEG C of temperature, follow to the gas inside ammonia presaturation storehouse 2
Ring and heating；Active carbon residence time in ammonia presaturation storehouse 2 is not less than 40min, until active carbon ammonia presaturation absorption terminates, so
After open the second sealing valve 4, and be filled with nitrogen 7, ammonia presaturation active carbon drawn off, adsorption tower 14 is delivered to；
Step 3, ammonia presaturation active carbon enter the active carbon cloth section 145 of adsorption tower 14, and flue gas passes through in adsorption tower 14
After crossing desulphurization reaction and denitration reaction, and the active carbon further progress denitration reaction for being adsorbed with ammonia, according to 14 entrance of adsorption tower
Data are shown with the NOx concentration and ammonia density analyzer 6 shown in the flue gas automatic monitored control system of exit, pass through outlet drain
Concentration schedule calculates the consumption of ammonia, automatic interlock control the first regulating valve 11 and the second regulating valve 12 for ammonia amount.
In summary: ammonia system and technique are sprayed in active carbon desulfurization denitration of the invention in advance, by active carbon transportation system
In add pre- ammonia-gas spraying device, it is before entering the adsorption column, right in ammonia presaturation storehouse by the active carbon after Analytic Tower regenerates
Active carbon carries out spray ammonia absorption, makes the enough ammonia of active carbon physical absorption, to enter feed bin above adsorption tower, active carbon is from upper
Under and, from bottom to top, the two counter current contacting reacts flue gas, the ammonia adsorbed on active carbon can rapidly with it is remaining in flue gas
Unreacted NOx react and generate nitrogen, achieve the purpose that further denitrating flue gas.
Pre- ammonia-gas spraying device and conventional adsorption tower spray ammonia section are combined, a kind of combination and cooperation denitrating technique is formed, into one
Step improves denitration efficiency, reaches super minimum discharge requirement NOx ≯ 30mg/Nm3；While improving denitration efficiency, and it can control
The escaping of ammonia, while ammonia consumption can be saved, improve economy.
The above description is only a preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of pre- spray ammonia system of active carbon desulfurization denitration, which is characterized in that the pre- spray ammonia system includes:
Pre- ammonia-gas spraying device, the pre- ammonia-gas spraying device include ammonia presaturation storehouse, the activity being pre-set in ammonia presaturation storehouse
Charcoal absorbs into the ammonia in ammonia presaturation storehouse, to obtain ammonia presaturation active carbon；
Adsorption tower, the adsorption tower are provided with active carbon entrance, the ammonia presaturation active carbon from the pre- ammonia-gas spraying device
Enter the adsorption tower through the active carbon entrance, the adsorption tower is reacted for flue gas desulfurization and denitrification.
2. the pre- spray ammonia system of active carbon desulfurization denitration as described in claim 1, which is characterized in that the pre- spray ammonia system is also
It is described to provide ammonia into ammonia presaturation storehouse and the adsorption tower for ammonia device including for ammonia device.
3. the pre- spray ammonia system of active carbon desulfurization denitration as claimed in claim 1 or 2, which is characterized in that the ammonia presaturation
The first sealing valve is provided on the pipeline of the top of the warehouse, active carbon is entered in ammonia presaturation storehouse by first sealing valve；
The second sealing valve is provided on the pipeline of the bottom in ammonia presaturation storehouse, the ammonia presaturation active carbon is close by described second
Envelope valve is drawn off；
Preferably, nitrogen has been passed through in the exit of the inlet of first sealing valve and second sealing valve；
More preferably, first sealing valve and the second sealing valve are rotary seal valve.
4. the pre- spray ammonia system of active carbon desulfurization denitration as described in any one of claims 1-3, which is characterized in that the pre- spray
Ammonia device is additionally provided with ammonia circulating fan, and the entrance of the ammonia circulating fan is upper by first pipe and ammonia presaturation storehouse
The outlet of portion's connection, the ammonia circulating fan is connected to by second pipe with the lower part in ammonia presaturation storehouse, and ammonia passes through institute
Ammonia circulating fan is stated in the inside and outside formation circulation in ammonia presaturation storehouse.
5. the pre- spray ammonia system of active carbon desulfurization denitration as claimed in claim 4, which is characterized in that set in the first pipe
It is equipped with ammonia density analyzer.
6. such as the pre- spray ammonia system of the described in any item active carbon desulfurization denitrations of claim 2-5, which is characterized in that described for ammonia
Device includes aqua ammonia pump and ammonia evaporator, and the aqua ammonia pump connects one end of the ammonia evaporator, the ammonia evaporator it is another
Hold the lower part for being respectively connected to ammonia presaturation storehouse and the adsorption tower；
The first regulating valve is provided on the pipeline that the aqua ammonia pump is connected with the ammonia evaporator；
The second regulating valve is provided on the pipeline that the ammonia evaporator is connected with ammonia presaturation storehouse.
7. the pre- spray ammonia system of active carbon desulfurization denitration as claimed in any one of claims 1 to 6, which is characterized in that the ammonia is pre-
Saturation storehouse is provided with heating device；
Preferably, the heating device is steam companions heating；
More preferably, 135~145 DEG C of temperature are heated to ammonia presaturation storehouse.
8. such as the pre- spray ammonia system of the described in any item active carbon desulfurization denitrations of claim 3-7, which is characterized in that the pre- spray
Ammonia system further includes active carbon Analytic Tower, is pre-set at the active carbon in ammonia presaturation storehouse from the active carbon solution
Analyse tower；Preferably, the active carbon of the active carbon Analytic Tower enters ammonia presaturation storehouse by first sealing valve；
Preferably, the adsorption tower successively includes smoke inlet section, desulfurization bed, spray ammonia section, denitration bed and work from top to bottom
Property charcoal cloth section.
9. a kind of pre- spray ammonia process of active carbon desulfurization denitration as described in claim 1, which is characterized in that the pre- spray ammonia work
Skill includes the following steps:
Active carbon is placed in ammonia environment the progress ammonia presaturation processing in ammonia presaturation storehouse, it is pre- to obtain ammonia by step 1
Saturated activity charcoal；
The ammonia presaturation active carbon is introduced into adsorption tower by step 2, while being supplied ammonia into the adsorption tower and being carried out cigarette
Desulfurization denitration reaction.
Preferably, the pre- spray ammonia process is completed using the described in any item pre- spray ammonia systems of claim 2-8, the step 1
Used in ammonia used in ammonia and step 2 generated by for ammonia device；
After the flue gas desulfurization and denitrification reaction refers to that the flue gas entered from the adsorption tower smoke inlet first passes around desulfurization bed
It realizes desulfurization, reacts subsequently into denitration bed and under the catalysis of active carbon with the ammonia entered in adsorption tower and realize denitration,
Then with the ammonia further progress denitration reaction that is adsorbed in the ammonia presaturation active carbon, cigarette after desulfurization and denitrification reaction
Gas is discharged from adsorption tower exhanst gas outlet.
10. the pre- spray ammonia process of active carbon desulfurization denitration as claimed in claim 9, which is characterized in that set on the adsorption tower
It is equipped with flue gas automatic monitored control system, the NOx concentration of the adsorption tower smoke inlet and the adsorption tower exhanst gas outlet is monitored, passes through
Outlet drain concentration schedule calculates the consumption of ammonia, automatic interlock control the first regulating valve for ammonia amount；
Preferably, according to the data of the ammonia density analyzer in the pre- ammonia-gas spraying device, automatic interlock controls the second regulating valve
For ammonia amount；
Preferably, in the step 1, the time that active carbon carries out ammonia presaturation processing in ammonia presaturation storehouse is not less than
40min。
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