CN110141944A - A kind of SNCR and PNCR synergistic combinations denitrating system and denitration method for flue gas for High-temp. kiln - Google Patents
A kind of SNCR and PNCR synergistic combinations denitrating system and denitration method for flue gas for High-temp. kiln Download PDFInfo
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- CN110141944A CN110141944A CN201910455195.1A CN201910455195A CN110141944A CN 110141944 A CN110141944 A CN 110141944A CN 201910455195 A CN201910455195 A CN 201910455195A CN 110141944 A CN110141944 A CN 110141944A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 239000003546 flue gas Substances 0.000 title claims abstract description 27
- 239000011885 synergistic combination Substances 0.000 title claims abstract description 22
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 149
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 98
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 73
- 238000002347 injection Methods 0.000 claims abstract description 21
- 239000007924 injection Substances 0.000 claims abstract description 21
- 238000003860 storage Methods 0.000 claims abstract description 18
- 238000007791 dehumidification Methods 0.000 claims abstract description 17
- 230000006835 compression Effects 0.000 claims abstract description 9
- 238000007906 compression Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims description 45
- 239000007921 spray Substances 0.000 claims description 24
- 239000004615 ingredient Substances 0.000 claims description 18
- 238000006073 displacement reaction Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000010790 dilution Methods 0.000 claims description 11
- 239000012895 dilution Substances 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 230000032258 transport Effects 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 2
- 230000008859 change Effects 0.000 claims 1
- 239000003595 mist Substances 0.000 claims 1
- 238000002156 mixing Methods 0.000 claims 1
- 239000003517 fume Substances 0.000 abstract description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 12
- 239000000908 ammonium hydroxide Substances 0.000 description 12
- 238000006722 reduction reaction Methods 0.000 description 12
- 239000004568 cement Substances 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 9
- 238000000889 atomisation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
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- 238000009826 distribution Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- KHTPCDDBDQRIRX-UHFFFAOYSA-N azane;hydrate Chemical compound N.[NH4+].[OH-] KHTPCDDBDQRIRX-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
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- 238000009792 diffusion process Methods 0.000 description 1
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- 239000010419 fine particle Substances 0.000 description 1
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- 238000005194 fractionation Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
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- 230000035484 reaction time Effects 0.000 description 1
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- 229920006395 saturated elastomer Polymers 0.000 description 1
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Classifications
-
- 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
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- 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
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
- B01D53/565—Nitrogen oxides by treating the gases with solids
-
- 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
- B01D53/75—Multi-step processes
-
- 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
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
-
- 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
-
- 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
- B01D2251/2067—Urea
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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Abstract
The invention discloses a kind of SNCR and PNCR synergistic combinations denitrating system and denitration method for flue gas for High-temp. kiln, High-temp. kiln fume treatment field, including SNCR pretreatment system and PNCR system；The SNCR pretreatment system, including ammonia system reducing agent storage tank, metering system, the equal subsystem of SNCR, air compression system, ammonia system reductant injection system control NOx exit concentration in 200-250mg/m3；The PNCR system, including between blower fan system, dehumidification work, the equal subsystem of PNCR, PNCR pulvis gun system, control flue gas NOx concentration of emission be less than 100mg/m3；This system includes SNCR pretreatment system, PNCR system, and the collaboration of two systems gives full play to investment efficient, stable, the pollution-free feature low, at low cost and PNCR of original SNCR, effectively avoids SNCR technical efficiency low and the escaping of ammonia excessive problem.
Description
Technical field
The present invention relates to High-temp. kiln fume treatment fields, and in particular to a kind of SNCR and PNCR for High-temp. kiln
Synergistic combinations denitrating system and denitration method for flue gas.
Background technique
The tail gas NOx abatement of the High-temp. kilns such as cement kiln system uses an emission reduction and secondary Treatment process to combine substantially at present
Mode, it is quick because its is with low investment since an emission-reduction technology of NOx belongs to the combustion control technology in NOx generation, it is right
Normal production almost has no effect, therefore is widely used, but its 15%~30% denitration efficiency make its
Secondary Treatment process must be combined in the control of NOx emission.
Currently, there are mainly two types of denitration technologies used by the tail gas NOx of the High-temp. kilns such as cement kiln system bis- times improvement, S
NCR selective non-catalytic reduction method (abbreviation SNCR method) and SCR selective catalytic reduction (abbreviation SCR method).SNCR method is in water
It is commonly used in the production such as stall system, its main feature is that: use ammonium hydroxide or the liquefied ammonia of 20%~25% concentration for reducing agent, skill
Art investment is low, and denitration efficiency is not high, and only 30%~50%, and the technical characterstic of SCR method is equally that can be used 20%~25%
The ammonium hydroxide or liquefied ammonia of concentration are reducing agent, and reaction need to be completed by catalyst, have technological investment high, denitration efficiency is high, reachable
90% or more feature, but because of the environment of the high dirt, high-sulfur that can not adapt to cement furnace etc., therefore in industries such as cement, building materials
In rarely have application.
With further increasing for environmental protection standard, the SNCR generallyd use needs it in actual use due to low efficiency
Increase addition amount of reducing agent.And a large amount of uses of reducing agent, cause reduction reaction to be saturated rapidly, the escaping of ammonia numerical value is in times several levels
Rise, well beyond environmental protection standard.Simultaneously in stove system material absorption excess ammonia, also with material circulation and propagate, into
One step causes the pollution of environment, and furthermore the compound of the generations such as excess ammonia and high-sulfur in stove, also exacerbates the corruption of equipment
Erosion, causes the broken holes such as furnace wall, leaks out, and " Red River " phenomenon, preheater inner wall top, middle part or cone bottom fastening bolt easily occurs in stove
There are the accidents such as fail, collapse because corroding aggravation in equal positions, or even parts surface seems intact when blowing out checks, then
There is component failure or collapse, seriously affects the safety and stability of stove system entirety.
To sum up, generally believe SNCR method stability contorting NOx emission limiting value in 200mg/m in the industry3Left and right, in this index
Under, cement furnace etc. could long-term safety operation.
PNCR denitration technology belongs to novel high polymer pulvis denitration method, in technique powdered macromolecule denitrfying agent and NOx into
Row reduction reaction.
Summary of the invention
Present invention aims at aiming at the shortcomings in the prior art, provide a kind of SNCR and PNCR for High-temp. kiln
Synergistic combinations denitrating system, this system include SNCR pretreatment system, PNCR system and public electric control system, SNCR pre-
The collaborative work of processing system and PNCR system two systems, the investment for giving full play to original SNCR are low, at low cost and PNCR
Efficiently, stable, pollution-free feature effectively avoids SNCR technical efficiency low and the escaping of ammonia excessive problem, to make entire cement kiln
The High-temp. kilns such as system meet the requirement of national environmental protection ultra-low emission of NOx under the premise of safety and stability.
A kind of SNCR and PNCR synergistic combinations denitrating system for High-temp. kiln, which is characterized in that locate in advance including SNCR
Reason system and PNCR system；
The SNCR pretreatment system, including the compression of ammonia system reducing agent storage tank, metering system, the equal subsystem of SNCR, air
System, ammonia system reductant injection system control NOx exit concentration in 200-250mg/m3；The PNCR system, including blower
Between system, dehumidification work, the equal subsystem of PNCR, PNCR pulvis gun system, stability contorting flue gas NOx concentration of emission is less than
100mg/m3。
Specifically, the ammonia system reducing agent storage tank, for storing ammonia system reducing agent；
The metering system enters the use total amount of the equal subsystem of SNCR for controlling ammonia system reducing agent；
Ammonia system reducing agent is assigned to each branch line by the equal subsystem of SNCR, is passed into ammonia system reducing agent injection system
In multiple injection apparatus in system；
The air compression system, the compressed air of the air compression system can will enter the ammonia of the equal subsystem of SNCR
It is reducing agent atomization；
Ammonia system reductant injection system, the ammonia system reducing agent including a cuff pipeline electromagnetic valve and compressed air joint
The telescoping mechanism that spray gun and its control spray gun stretch, sprays into denitration first after being atomized ammonium hydroxide completely when major function is work
Reaction zone, to increase diffusion mixed effect；Start telescoping mechanism when inoperative to retract automatically, spray gun is avoided to be exposed to for a long time
Under high temperature, pipeline electromagnetic valve can be controlled separately the start and stop of each spray gun, effectively the coverage area and precision of control injection.
It is empty that major ingredient storehouse, positive displacement frequency conversion metering batcher, venturi-type eductors and dehumidifying are equipped in the dehumidification work
It adjusts；The dehumidification air conditioner can automatically control the relative humidity in dehumidification work not higher than 70%；
The major ingredient storehouse, for storing reducing agent；
Batcher is measured in the positive displacement frequency conversion, can precisely give the supply amount of reducing agent, and is conveyed to venturi spray
Emitter；
The blower fan system includes two roots blowers, is interlocked each other, defeated to guarantee the using and the reserved in process of pneumatic transmission
Air-supply is passed through venturi-type eductors；
The venturi-type eductors blend reducing agent, and reducing agent is in the case where conveying wind drives, with positive pressure dilute phase pneumatic conveying
Mode is supplied to the equal subsystem of PNCR；
Specifically, the equal subsystem of PNCR, which evenly distributes reducing agent, is delivered to each road branch pipe, each road branch pipe and PNCR
The spray gun of pulvis spraying system is connected to.
Further, SNCR the and PNCR synergistic combinations denitrating system for High-temp. kiln further includes public electrical
Control system；
The public electric control system, by the monitoring system of public electric control system to the discharge number of flue gas NOx
It is calculated according to acquisition, controls ammonia system reducing agent respectively and enter the total amount in metering system, and batcher is measured in control positive displacement frequency conversion
Middle reducing agent enters the pulvis amount of venturi-type eductors, cooperates with denitration, finally meets the requirement up to standard of flue gas NOx discharge value.Together
When, system also controls PNCR pulvis gun system dredging movement.
Further, the SNCR pretreatment system further includes dilution water control pressurer system and the supply circulatory system；
Dilution water control pressurer system, can supply dilution water enter metering system and high concentration ammonia system reducing agent it is mixed
It closes, reduces the concentration of ammonia system reducing agent；
The supply circulatory system can send the ammonia system reducing agent having more in metering system back to ammonia system reducing agent storage tank.
Further, the ammonia system reducing agent storage tank, the supply circulatory system, be provided with chassis, bottom below metering system
Disk is arranged with independent discharging tube road, the waste liquid discharge generated when can be by maintenance and equipment fault.
Further, automatic charging unit, including bottom hopper and pipe chain conveying are additionally provided in the dehumidification work
Machine, the reducing agent that PNCR pulvis transport vehicle transports are transported in bottom hopper, are conveyed by pipe chain-linked conveyer from bottom hopper
Into major ingredient storehouse.
Further, the lower section in major ingredient storehouse is arranged in the positive displacement frequency conversion metering batcher.
A kind of denitrating flue gas side described in application for SNCR the and PNCR synergistic combinations denitrating system of High-temp. kiln
Method includes the following steps:
1) apply the SNCR pretreatment system, preliminary denitration carried out to flue gas to be processed, the first reaction zone of denitration also
After original, NOx exit concentration is controlled in 200-250mg/m3；
2) apply the PNCR system, flue gas of the processing by step 1) tentatively after denitration, denitration second reaction zone also
After original, by NOx exit concentration stability contorting in 100mg/m3Below；
3) according to the concentration of NOx in the first reaction zone of denitration and the flue gas of denitration second reaction zone, using public electric-controlled
The reducing agent the amount of injection of system control SNCR pretreatment system and the PNCR system processed.
The utility model has the advantages that
1) present invention includes SNCR pretreatment system and PNCR system, and two systems cooperate, give full play to original
Investment efficient, stable, the pollution-free feature low, at low cost and PNCR of SNCR, effectively avoids SNCR technical efficiency low and ammonia is escaped
Ease excessive problem, so that the high temperature furnaces such as entire cement kiln be made to meet national environmental protection ultra-low emission of NOx under the premise of safety and stability
It is required that.
2) it in practical application, by taking CFD computer simulation to establish the basic environment of SNCR and PNCR reaction, establishes
SNCR and PNCR optimizes ejection schemes, and the NOx concentration of stove tail portion is pressed by the electric control system GCU of system, is precisely counted
The reducing agent usage amount of each system is calculated, distributed and controlled, guarantees the efficiency for giving full play to SNCR, effectively controls PNCR entrance NOx
It is emitted on 200~250mg/m3, SNCR pretreatment system and PNCR system is allowed to integrate the best situation of O&M cost
Under, reach maximum denitration efficiency and generates least the escaping of ammonia.
3) present invention greatly reduces ammonia system reducing agent when SNCR denitration by the denitration of SNCR and PNCR synergistic combinations
Usage amount, avoid the use of a large amount of ammonia systems reducing agent, to reduce environmental pollution caused by the escaping of ammonia, also avoid
Equipment corrosion and damage caused by the compound of generations such as high-sulfur in excess ammonia and stove.
4) PNCR denitration technology is applied in the equal high temperature kilns of cement furnace by the present invention for the first time.
PNCR denitration technology belongs to novel high polymer pulvis denitration method, and powdered macromolecule denitrfying agent is directly sprayed in technique
Enter 750 DEG C~1100 DEG C temperature ranges such as cement furnace, carry out reduction reaction with NOx herein, optimal reaction temperature is 8 50
DEG C, the reaction time is only Millisecond, can be completed moment, denitration efficiency > 85%.
Since the reducing agent used is powdered fine particle, with ammonium hydroxide used by SNCR method and SCR method or liquefied ammonia phase
Than having the characteristics that nontoxic, tasteless, non-corrosive, belonging to non-harmful influence, transport, storage, use condition are very convenient.Simultaneously
System has that Precise spraying, occupied area be small, auto-control, and without heating, hydrolysis or atomization when use, system energy consumption is low,
The features such as synthesis O&M cost is low, also without " Gu dangerous waste " secondary pollution etc..
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the positional structure schematic diagram that batcher is measured in main feed bin and positive displacement frequency conversion
In figure: 1, air compression system；2, the equal subsystem of SNCR；3, metering system；4, dilution water control pressurer system；
5, ammonia system reducing agent storage tank；6, the circulatory system is supplied；7, ammonia system reducing agent discharge system；8, blower fan system；9, PNCR pulvis is transported
Defeated system；10, automatic charging unit；11, major ingredient storehouse；12, between dehumidification work；13, batcher is measured in positive displacement frequency conversion；14, it removes
Wet air-conditioning；15, the equal sub-module of PNCR；16, denitration second reaction zone；17, chimney；18, the first reaction zone of denitration；19, public power
Gas control system；20, detection system；21, ammonia system reductant injection system；22, venturi-type eductors.
Specific embodiment
Technical solution of the present invention is described in detail below by attached drawing, but protection scope of the present invention is not limited to
The embodiment.
The tail gas NOx abatement of the High-temp. kilns such as cement kiln system uses an emission reduction and secondary Treatment process to combine substantially at present
Mode, it is quick because its is with low investment since an emission-reduction technology of NOx belongs to the combustion control technology in NOx generation, it is right
Normal production almost has no effect, therefore is widely used, but its 15%~30% denitration efficiency make its
Secondary Treatment process must be combined in the control of NOx emission.
A kind of SNCR and PNCR synergistic combinations denitrating system for High-temp. kiln of the present invention, mainly to cement furnace
Etc. the tail gas of industries and thermal power industry (except garbage power industry) carry out an emission-reduction technology treated tail containing NOx
Gas carries out secondary treatment, reaches discharge standard.
Between SNCR and PNCR collaboration denitrating technique has two reaction zones, first reaction zone 18 of denitration is to pass through arrangement
Ammonium hydroxide is sprayed into burner hearth by the ammonia system reductant injection system on furnace wall, and at high temperature, the NOx in ammonium hydroxide and flue gas occurs also
Original reaction, realizes preliminary denitration, and the PNCR spraying system being subsequently placed on decomposition furnace outlet first order preheater sprays into high score
Sub- pulvis reducing agent continues to carry out reduction reaction with NOx in denitration second reaction zone 16, by cigarette together with a small amount of unreacted ammonia
NOx conversion in gas is nitrogen and water, key reaction equation are as follows:
4NO+4NH3+O2→4N2+6H2O (key reaction)
2NO2+4NH3+O2→3N2+6H2O
NH3+ H=NH2+H2
NH3+ OH=NH2+H2O
NH3+ O=NH2+OH
2NH3+ 4NO=N2+4HNO
The synergistic combinations of two systems operate, and are according to taking into account SNCR pretreatment system under typical condition based on system program
Denitration efficiency and NOx exit concentration are controlled in 200-250mg/m3, PNCR systematic collaboration completion flue gas NOx concentration of emission ≯
100mg/m3Principle design, it is contemplated that the fluctuation of practical stove exit NOx concentration is big, reducing agent injection and the NOx concentration wave sound of something astir
It answers delay time long, uses the reducing agent for controlling the first reaction zone 18 and second reaction zone 16 with NOx fluctuating range size fractionation
The amount of injection, in the allowed band of setting when narrow fluctuation, program keeps the dosage of reducing agent, when NOx emission is beyond setting width
When spending range, according to the difference that flue gas tail portion NOx concentration fluctuating range and combination NOx fluctuation range limit, according to respective setting
Gain adjusts the pro rate between SNCR pretreatment system and PNCR system reducing agent dosage respectively, and gain setting is sufficiently examined
Consider signal delay phenomenon and the synthesis of system is effectively reduced while meeting denitrating technique processing requirement in fluctuation amplitude size
Operation expense.
As shown in Figure 1, a kind of SNCR and PNCR synergistic combinations denitrating system for High-temp. kiln, which is characterized in that packet
SNCR pretreatment system and PNCR system are included, further includes public electric control system 19.
The SNCR pretreatment system, including the equal subsystem 2 of ammonia system reducing agent storage tank 5, metering system 3, SNCR, air
Compressibility 1, ammonia system reductant injection system 21 further include dilution water control pressurer system 4 and the supply circulatory system 6.
The ammonia system reducing agent storage tank 5, for storing ammonia system reducing agent, ammonia system reducing agent is ammonium hydroxide or urea；
The metering system 3 enters the amount of the equal subsystem 2 of SNCR for controlling ammonia system reducing agent；
The compressed air of the air compression system 1, the air compression system 1 can will enter the equal subsystem 2 of SNCR
Ammonia system reducing agent atomization；
Ammonia system reducing agent after atomization is assigned to multiple pipelines by the equal subsystem 2 of SNCR, is passed into the reduction of ammonia system
In multiple injection apparatus in agent spraying system 21；
Ammonia system reductant injection system 21 is sprayed including a cuff pipeline electromagnetic valve and with the ammonium hydroxide of compressed air joint
Rifle and its telescoping mechanism spray into the first reaction zone of denitration 18 after being atomized ammonium hydroxide completely when major function is work, expanded with increasing
Dissipate mixed effect；Start telescoping mechanism when inoperative to retract automatically, avoids spray gun exposure for a long time at high temperature, pipeline electromagnetic
Valve can be controlled separately the start and stop of each spray gun, effectively the coverage area and precision of control injection.
Dilution water control pressurer system 4, can supply dilution water enter metering system 3 and high concentration ammonia system reducing agent it is mixed
It closes, reduces the concentration of ammonia system reducing agent.When using high strength ammonia system reducing agent, need its concentration dilution.
The supply circulatory system 6 can send the ammonia system reducing agent having more in metering system 3 back to ammonia system reducing agent storage tank
5, guarantee the normal operation pumped when valve is closed.
Ammonium hydroxide ammonia system reducing agent storage tank 5 is equipped with high-low-position liquidometer, breather valve, connecting line and valve etc..
The SNCR pretreatment system, is additionally provided with loading system 7, and ammonia system reducing agent in conveying trough tank car is injected into
In ammonia system reducing agent storage tank 5.
The loading system 7 include two self-priming ammonium hydroxide delivery pumps, control cabinet, the import and export pipeline, connect with tank car it is soft
Pipe and fast joint, import Y type strainer and outlet non-return valve；Control cabinet controls the start and stop of self-priming ammonium hydroxide delivery pump, the start and stop of pump
Instruction and protection detection interlocking are overflowed with 5 liquid level of ammonia system reducing agent storage tank.
The ammonia system reducing agent storage tank 5, the lower section for supplying the circulatory system 6, metering system 3 and loading system 7 are provided with bottom
Disk, chassis are arranged with independent discharging tube road, the waste liquid discharge generated when can be by maintenance and equipment fault, it is ensured that over the ground
Face does not generate pollution.
The metering system 3, including exits and entrances valve, bypass conduit, flowmeter, static mixer and pump, can be with public affairs
With being communicated by bus for electric control system 19, real-time Transmission instantaneous flow and ammonium hydroxide total amount are public electrical control
The calculating of system 19 provides accurate data.
The air compression system 1 includes air compressor, inlet pressure regulating valve, filter, pipeline and valve.
The PNCR system, including the equal subsystem 15 of 12, PNCR, PNCR pulvis spray gun between blower fan system 8, dehumidification work
System, 12 between the dehumidification work in be equipped with major ingredient storehouse 11, batcher 13,22 and of venturi-type eductors are measured in positive displacement frequency conversion
Two dehumidification air conditioners；Automatic charging unit 10 is additionally provided in 12 between the dehumidification work.
The dehumidification air conditioner can automatically control the relative humidity in 12 between dehumidification work not higher than 70%；
The automatic charging unit 10, including bottom hopper and pipe chain-linked conveyer, what PNCR pulvis transport vehicle transported goes back
Former agent is transported in bottom hopper, is transported in major ingredient storehouse 11 by pipe chain-linked conveyer from bottom hopper；
The major ingredient storehouse 11, for storing reducing agent, the major ingredient storehouse 11 is equipped with height level-sensing device, breather valve, discharging
The bottom of bobbing machine, dedirt device, electric tracing, bulkhead bobbing machine and the loose pipeline of compressed air, the major ingredient storehouse 11 is equipped with hand
Dynamic Shuttoff Valve and star-shaped discharge valve；The height level-sensing device and automatic charging unit 10 cooperate, and realize automatic charging；It is described
Discharging bobbing machine is used to eliminate the slight hardened of reducing agent in blanking, in order to avoid cause to block；The top breather valve and dedirt dress
Setting guarantee feed bin, inside and outside pressure equilibrium and the powder eliminated in discharge process are flown upward, it is ensured that the working environment of operator；It is described
Bulkhead bobbing machine, electric tracing and the loose pipeline of compressed air are used to ensure the fluidization of reducing agent in feed bin, prevent bin outlet
Blocking；The star-shaped discharge valve is used to measure 13 Automatic-feeding of batcher for positive displacement frequency conversion, manually switches off valve for when overhauling
Major ingredient storehouse 11 is cut off to be fed；
As shown in Fig. 2, the lower section in major ingredient storehouse 11 is arranged in the positive displacement frequency conversion metering batcher 13；
As shown in Figure 1, batcher 13 is measured in positive displacement frequency conversion, the supply amount of reducing agent can be precisely given, and be conveyed to
Venturi-type eductors 22；Positive displacement frequency conversion measures batcher 13 according to public 19 calculated result of electric control system, precisely
The supply amount of given reducing agent, main pipe pipeline install gas-solid flow detector monitoring material agent actual flow, are described public electrical
The data that control system 19 provides material agent flux show and feed back, and are conveyed to venturi-type eductors 22, spray in venturi
In device 22, conveying wind blends reducing agent, and the equal subsystem 15 of the PNCR is supplied in a manner of positive pressure dilute phase pneumatic conveying.
The blower fan system 8 includes two roots blowers, is interlocked each other, to guarantee the using and the reserved in process of pneumatic transmission,
Conveying wind is passed through venturi-type eductors 22, and reducing agent is driven to enter the equal subsystem 15 of PNCR；
Valve is set before and after each blower, equipment to be repaired is isolated when maintenance to ensure, guarantees the safety of service personnel；Check-valves
Design completely cut off air-flow channelling between two Fans；Pressure gauge and pressure transmitter are set on the spot, convenient for site inspection and far
Journey monitoring.Electric control system is arranged in control panel cabinet, and signal is transmitted through bus connection.
The equal subsystem 15 of PNCR, reducing agent is transported to after the ring-like main pipe of the equal subsystem 15 of PNCR uniformly to be divided again
It is assigned to each road branch pipe, each road branch pipe is connected to the spray gun of PNCR pulvis spraying system.
The PNCR pulvis spraying system includes a set of automatic sparse flow-through pulvis spray gun, branch way solenoid valve and hand-operated valve, ginseng
According to CFD optimum results setting Burners Positions, spray angle, injection pressure, and branch is automatically controlled according to the operating condition of program setting
Reducing agent is accurately sprayed into denitration second reaction zone 16 by the opening and closing of solenoid valve, guarantee in the best way.Each branch road is arranged simultaneously
A set of temperature monitoring device monitors spray gun working condition in real time, when there is spray gun blocking, using compressed air as power from
Dynamic dredger automatic work (also manually controllable) by setup program, dredging gun internal channel and gun head ensure PNCR system
The normal work of system.
The public electric control system 19, by the monitoring system 20 of public electric control system 19 to flue gas NOx
Emissions data acquisition calculates, and controls ammonia system reducing agent respectively and enters the total amount in metering system 3, and control positive displacement frequency conversion meter
Reducing agent enters the pulvis amount of venturi-type eductors 22 in amount batcher 13, cooperates with denitration, finally meets flue gas NOx discharge value and reach
Mark requires.Meanwhile public electric control system 19 is also dynamic to the dredging that the automatic dredging device in PNCR pulvis gun system is thin
It is controlled.
The public electric control system 19, including artificial PLC, PROFIBUS distribution I/O, bus communication, Suo You electricity
Gas part is assemblied in a control panel cabinet, is communicated by distributed I/O and bus with control system.With full-automatic
Control, management, coordination and monitoring function, distribution reducing agent can be accurately calculated and pinpoint by chasing after window control mode by temperature
Amount,；The public electric control system 19 also sets up local operation person station, using HMI human-computer interaction interface, with process flow
It has been shown that, operates and adjusts to system convenient for personnel；System may be selected with regard to ground mode and remote control mode, and instruction can be with
It is convenient, flexible from regard to the DCS under the operator station or remote mode under ground mode.Communication and data exchange pass through main website DP
With PROFIBUS bus, it is connected with head factory DCS system, and receives the signal from head factory.
A kind of denitrating flue gas side described in application for SNCR the and PNCR synergistic combinations denitrating system of High-temp. kiln
Method includes the following steps:
1) the SNCR pretreatment system is applied, preliminary denitration is carried out to flue gas to be processed, in the first reaction zone of denitration 18
After reduction, NOx exit concentration is controlled in 200-250mg/m3；
2) the PNCR system is applied, the flue gas after the preliminary denitration of step 1) is handled, in denitration second reaction zone 16
After reduction, by NOx exit concentration stability contorting in 100mg/m3Below；
3) according to the concentration of NOx in the first reaction zone of denitration and the flue gas of denitration second reaction zone, using public electric-controlled
System 19 processed controls the reducing agent the amount of injection of SNCR pretreatment system and the PNCR system.
As described above, must not be explained although the present invention has been indicated and described referring to specific preferred embodiment
It can be to it in form under the premise of not departing from the spirit and scope that appended claims define for the limitation to invention itself
It is made a variety of changes in upper and details.
Claims (9)
1. a kind of SNCR and PNCR synergistic combinations denitrating system for High-temp. kiln, which is characterized in that pre-processed including SNCR
System and PNCR system；
The SNCR pretreatment system, including ammonia system reducing agent storage tank (5), metering system (3), the equal subsystem of SNCR (2), air
Compressibility (1), ammonia system reductant injection system (21) control NOx exit concentration in 200-250mg/m3；
(12), the equal subsystem of PNCR (15), PNCR pulvis spray gun between the PNCR system, including blower fan system (8), dehumidification work
System, stability contorting flue gas NOx concentration of emission are less than 100mg/m3。
2. SNCR the and PNCR synergistic combinations denitrating system according to claim 1 for High-temp. kiln, which is characterized in that
The ammonia system reducing agent storage tank (5), for storing ammonia system reducing agent；
The metering system (3), the use total amount of the equal subsystem of SNCR (2) is entered for controlling ammonia system reducing agent；
The equal subsystem of SNCR (2) is passed into the reduction of ammonia system for ammonia system reducing agent to be assigned to each tap line of SNCR
In multiple injection apparatus in agent spraying system (21)；
The air compression system (1), is used to prepare compressed air, will enter the ammonia system reducing agent mist of the equal subsystem of SNCR (2)
Change；
Ammonia system reductant injection system (21), the ammonia system reducing agent including a cuff pipeline electromagnetic valve and compressed air joint
The telescoping mechanism that spray gun and control spray gun stretch；
Major ingredient storehouse (11) are equipped in (12) between the dehumidification work, batcher (13), venturi-type eductors are measured in positive displacement frequency conversion
(22) and dehumidification air conditioner；
The major ingredient storehouse (11), for storing reducing agent；
Batcher (13) are measured in the positive displacement frequency conversion, for precisely giving the supply amount of reducing agent, and are conveyed to venturi spray
Emitter (22)；
The blower fan system (8) includes two roots blowers, is interlocked each other, defeated to guarantee the using and the reserved in process of pneumatic transmission
Air-supply is passed through venturi-type eductors (22)；
The venturi-type eductors (22), for blending reducing agent, reducing agent is in the case where conveying wind drives, with positive pressure dilute phase pneumatic
Mode of movement is supplied to the equal subsystem of PNCR (15)；
The equal subsystem of PNCR (15), for reducing agent to be uniformly delivered to each road branch pipe, each road branch pipe and PNCR pulvis spray
Penetrate the spray gun connection of system.
3. SNCR the and PNCR synergistic combinations denitrating system according to claim 1 for High-temp. kiln, which is characterized in that
It further include public electric control system (19)；
The public electric control system (19), by the monitoring system (20) of public electric control system (19) to flue gas NOx
Emissions data acquire and calculate, control ammonia system reducing agent respectively and enter total amount in metering system (3) and control positive displacement frequency conversion
Reducing agent enters the pulvis amount of venturi-type eductors (22) in metering batcher (13), cooperates with denitration；
The public electric control system (19) can control the dredging movement of PNCR pulvis gun system.
4. SNCR the and PNCR synergistic combinations denitrating system according to claim 2 for High-temp. kiln, which is characterized in that
The SNCR pretreatment system further includes dilution water control pressurer system (4) and the supply circulatory system (6)；
Dilution water control pressurer system (4), can supply dilution water enter metering system (3) and high concentration ammonia system reducing agent it is mixed
It closes, reduces the concentration of ammonia system reducing agent；
The supply circulatory system (6) can send the ammonia system reducing agent having more in metering system (3) back to ammonia system reducing agent storage tank
(5)。
5. SNCR the and PNCR synergistic combinations denitrating system according to claim 4 for High-temp. kiln, which is characterized in that
The ammonia system reducing agent storage tank (5), the supply circulatory system (6) are provided with chassis below metering system (3), are arranged under chassis
There is independent discharging tube road, the waste liquid discharge generated when can be by maintenance and equipment fault.
6. SNCR the and PNCR synergistic combinations denitrating system according to claim 2 for High-temp. kiln, which is characterized in that
It is additionally provided with automatic charging unit (10) in (12) between the dehumidification work, including bottom hopper and pipe chain-linked conveyer, PNCR powder
The reducing agent that agent transport vehicle transports is transported in bottom hopper, is transported to major ingredient storehouse from bottom hopper by pipe chain-linked conveyer
(11) in.
7. SNCR the and PNCR synergistic combinations denitrating system according to claim 2 for High-temp. kiln, which is characterized in that
The major ingredient storehouse (11) be equipped with height level-sensing device, breather valve, discharging bobbing machine, dedirt device, electric tracing, bulkhead bobbing machine and
The loose pipeline of compressed air, the bottom of the major ingredient storehouse (11), which is equipped with, manually switches off valve and star-shaped discharge valve.
8. SNCR the and PNCR synergistic combinations denitrating system according to claim 2 for High-temp. kiln, which is characterized in that
Lower section of positive displacement frequency conversion metering batcher (13) setting in major ingredient storehouse (11).
9. a kind of using SNCR the and PNCR synergistic combinations denitration system for being used for High-temp. kiln described in claim 3-8 any one
The denitration method for flue gas of system, which comprises the steps of:
1) the SNCR pretreatment system is applied, preliminary denitration is carried out to flue gas to be processed, is gone back in the first reaction zone of denitration (18)
After original, NOx exit concentration is controlled in 200-250mg/m3；
2) the PNCR system is applied, the flue gas after the preliminary denitration of step 1) is handled, is gone back in denitration second reaction zone (16)
After original, by NOx exit concentration stability contorting in 100mg/m3Below；
3) according to the concentration of NOx in the first reaction zone of denitration (18) and the flue gas of denitration second reaction zone (16), using public power
The reducing agent the amount of injection of gas control system (19) control SNCR pretreatment system and the PNCR system.
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| CN201910455195.1A CN110141944A (en) | 2019-05-29 | 2019-05-29 | A kind of SNCR and PNCR synergistic combinations denitrating system and denitration method for flue gas for High-temp. kiln |
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Application publication date: 20190820 |