CN108452674A - A kind of efficient control device and method of gas fired-boiler nitrogen oxides - Google Patents
A kind of efficient control device and method of gas fired-boiler nitrogen oxides Download PDFInfo
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- CN108452674A CN108452674A CN201810326008.5A CN201810326008A CN108452674A CN 108452674 A CN108452674 A CN 108452674A CN 201810326008 A CN201810326008 A CN 201810326008A CN 108452674 A CN108452674 A CN 108452674A
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 105
- 239000007789 gas Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 97
- 238000001035 drying Methods 0.000 claims abstract description 78
- 239000003054 catalyst Substances 0.000 claims abstract description 69
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000003546 flue gas Substances 0.000 claims abstract description 52
- 238000006243 chemical reaction Methods 0.000 claims abstract description 49
- 239000000779 smoke Substances 0.000 claims abstract description 13
- 208000005735 Water intoxication Diseases 0.000 claims abstract description 11
- 239000002918 waste heat Substances 0.000 claims abstract description 7
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 238000006555 catalytic reaction Methods 0.000 claims description 12
- 239000004480 active ingredient Substances 0.000 claims description 8
- 239000003814 drug Substances 0.000 claims description 8
- 229910000510 noble metal Inorganic materials 0.000 claims description 8
- 239000011358 absorbing material Substances 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000006479 redox reaction Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 229910002451 CoOx Inorganic materials 0.000 claims description 4
- 229910016978 MnOx Inorganic materials 0.000 claims description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 4
- 230000001413 cellular effect Effects 0.000 claims description 4
- 239000003643 water by type Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 235000019504 cigarettes Nutrition 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000000470 constituent Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 12
- 239000003638 chemical reducing agent Substances 0.000 abstract description 11
- -1 burner Chemical class 0.000 abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 26
- 238000005516 engineering process Methods 0.000 description 16
- 229910052757 nitrogen Inorganic materials 0.000 description 13
- 230000008901 benefit Effects 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 6
- 239000003517 fume Substances 0.000 description 6
- 235000013399 edible fruits Nutrition 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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
- B01D53/74—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
-
- 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
- B01D53/26—Drying gases or vapours
-
- 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
- B01D53/26—Drying gases or vapours
- B01D53/28—Selection of materials for use as drying agents
-
- 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
- B01D53/8628—Processes characterised by a specific catalyst
-
- 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
- B01D53/8631—Processes characterised by a specific device
-
- 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
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a kind of efficient control device and methods of gas fired-boiler nitrogen oxides, including burner, drying system and flue gas on-line detecting system；Burner is connected to boiler body, it is connected to drying system after the baffle door that the exhanst gas outlet pipeline of boiler body is arranged by drying system, drying system after the baffle door and flue that are arranged thereon with catalyst reaction device by being connected to, the exhanst gas outlet pipeline of catalyst reaction device is connect by air-introduced machine with residual heat using device, the external smoke discharging pipe of residual heat using device outlet connection, residual heat using device is separately connected water treatment system and water replanishing device, boiler body is also connected with water replanishing device, flue gas on-line detecting system is also associated on flue between drying system and exhanst gas outlet.The device is not necessarily to additional reducing agent, easy to operate, while preventing catalyst water intoxication, improves using effect, extends catalyst service life, and system recycles the waste heat generated during flue gas emission with condensed water.
Description
Technical field
The invention belongs to green technology smokes, and in particular to a kind of gas fired-boiler nitrogen oxides is efficiently controlled
Device and method processed.
Background technology
Nitrogen oxides is predominantly in the form of NO and NO2, its natural environment and human body will produce different degrees of
Harm, may participate in form photochemical fog, cause generate acid rain, acid mist, aggravate greenhouse effects, destroy ozone layer, directly or
Ground connection generates toxic action to human body and other biological.Natural gas is a kind of energy of relative clean, and burning generates main
Pollutant is nitrogen oxides, but with increasingly stringent, the cigarette of Some gases boiler for the air pollution emission standard promulgated in succession
Gas discharge is not inconsistent standardization, and it is extremely urgent that nitrogen work drops in gas fired-boiler flue gas.
Application No. is 201620131576.6 Chinese invention patents, disclose a kind of gas fired-boiler of combination SCR reactions
Denitration process catalysis system needs additional reducing agent urea, and urea liquid is added in denitrating system and prepares spraying system, but denitration
Catalyst is easy to happen water intoxication, reduces using effect, and system complex, lacks safety；Application No. is
201420469202.6 Chinese invention patent discloses a kind of low nitrogen burning and selective non-catalytic reduction denitration device, packet
Include low NO, multiple spray guns, reducing agent distributor, atomizing air distributor, spray gun cooling air distributor, compressed air
Source and reducer feeding device carry out denitration using low nitrogen burning denitration technology and SNCR technologies, but system and device is complicated, energy saving
Property is poor, needs to improve.For gas fired-boiler, the transformation of traditional denitrification apparatus is complicated, and investment operating cost is high, it is difficult to promote.
Invention content
In order to solve the above technical problems, The present invention provides a kind of efficient control device of gas fired-boiler nitrogen oxides and sides
Method is not necessarily to additional reducing agent, easy to operate, while preventing catalyst water intoxication, improves using effect, extends catalyst and uses the longevity
Life, and system recycles the preheating generated during flue gas emission with condensed water.
The present invention is to be achieved through the following technical solutions：
A kind of efficient control device of gas fired-boiler nitrogen oxides, including boiler body, burner, drying system, catalysis are instead
Answer device, residual heat using device, water treatment system, water replanishing device and flue gas on-line detecting system；The burner and boiler
Ontology is connected to, and is connected to drying system after the baffle door that the exhanst gas outlet pipeline of boiler body be arranged by drying system, is dried
System after the baffle door and flue that are arranged thereon with catalyst reaction device by being connected to, the smoke outlet tube of catalyst reaction device
Road is connect by air-introduced machine with residual heat using device, the external smoke discharging pipe of residual heat using device outlet connection, residual heat using device
It is separately connected water treatment system and water replanishing device, boiler body is also connected with water replanishing device, between drying system and exhanst gas outlet
Flue on be also associated with flue gas on-line detecting system.
The drying unit dried to its drier, drying dress are provided with by baffle door below the drying system
It sets the other side and heat exchanger is connected by the baffle door and flue being arranged on drying system, heat exchanger is separately connected water treatment system
And water replanishing device.
Between the drying system and catalyst reaction device, between catalyst reaction device and air-introduced machine, UTILIZATION OF VESIDUAL HEAT IN dress
It sets and is both provided with sampled point between exhanst gas outlet, multiple sampled points are connected to flue gas on-line detecting system by switch valve
In control system.
The burner is low NO, and residual heat using device is connected by condensed water outlet pipe and water treatment system
It connects.
Porous water-absorbing material built in the drying system.
The porous water-absorbing material is heat-resisting porous dry agent, the flue gas gone out for dry pot fire grate.
The catalyst reaction device is built-in with board-like, corrugated or cellular catalyst module, and there is load in module contains
The catalyst for having noble metal active ingredient, the redox reaction for being catalyzed nitrogen oxides in effluent and carbon monoxide；Reaction
Formula is：NO+CO→N2+CO2。
The catalyst containing noble metal active ingredient is Pda-Rhb/(CoOx)c(MnOx)d, wherein 0<A≤0.2,0
<B≤0.2,0<C≤0.8,0<d≤0.7；Wherein, the reaction temperature window of this catalyst is 50-350 DEG C.
The residual heat using device be heat exchanger, energy-saving appliance or economizer, can also be with other residual heat using device shapes
Formula exists, and the circulation in heat exchanger is connect with water replanishing device, and a small amount of condensed water that heat exchanger generates passes through condensate pipe
Into water treatment system.
The water treatment system is also connected with water replanishing device, water treatment system include medicine storing pot, medicine adding controller and
Water tank, a small amount of condensed water that a large amount of condensed waters and residual heat using device for collecting and handling heat exchanger generation generate, and
The water supply being newly added, treated, and water enters water replanishing device.
A kind of efficient control method of gas fired-boiler nitrogen oxides, includes the following steps：
1) when boiler normal use, the concentration that boiler body burning generates is in 80mg/Nm3Flue gas below passes through fume pipe
Road enters in drying system, and the drier in drying system is to concentration in 80mg/Nm3Vapor in flue gas below is done
It is dry, vapor is removed, catalyst water intoxication is prevented；
2) flue gas enters catalyst reaction device by baffle door via flue after drying system is dried, containing expensive
Under the action of the catalyst of metal active ingredient, the nitrogen oxides in flue gas carries out redox reaction, reaction with nitric oxide
Formula is：NO+CO→N2+CO2；Purifying smoke after reaction enters residual heat using device after air-introduced machine；
3) it is discharged into air after carrying out heat exchange with circulatory mediator therein into the purifying smoke of residual heat using device, simultaneously
Always Online" detection is carried out to flue gas using flue gas on-line detecting system；The a large amount of condensed water that residual heat using device generates enters
Water treatment system processing；
4) when boiler shutdown, the baffle door that drying system is connect with boiler body and catalyst reaction device is in closing shape
State, other two baffle door is in open state on drying system, and drying unit dries the drier in drying system,
Drier is set to may be reused；
5) wet air after drying passes through the heat exchanger being connect with drying unit and is utilized to air preheat.
Compared with prior art, the present invention has technique effect beneficial below：
The efficient control device and method of gas fired-boiler nitrogen oxides provided by the invention is asked for existing gas fired-boiler drop nitrogen
Topic, the present invention is not necessarily to additional reducing agent, easy to operate, while preventing catalyst water intoxication, improves using effect, extends catalyst
Service life, and system recycles the waste heat generated during flue gas emission with condensed water, total environment effect
Benefit and remarkable in economical benefits.
(1) novel to use low nitrogen compared with conventional gas boiler low-NO_x combustion technology and tail portion SCR and SNCR denitration technology
Combustion technology and catalysis drop nitrogen technology, do not need additional reducing agent and flue gas outer circulation pipeline, you can reach current discharge mark
Standard, the low nitrogen transformation of boiler is convenient, easy to operate, safe.
(2) present invention dries boiler export flue gas, reduces catalyst water intoxication degree, improves catalysis effect
Fruit extends catalyst service life；Drier may be reused, and reduce cost.
(3) heat that system generates fume afterheat and drier drying carries out reuse, reduces energy waste.
Description of the drawings
Fig. 1 is the efficient controling device structure diagram of gas fired-boiler nitrogen oxides provided by the invention.
In figure：1 is boiler body, and 2 be burner, and 3 be drying system, and 4 be catalyst reaction device, and 5 be air-introduced machine, and 6 are
Residual heat using device, 7 be drying unit, and 8 be baffle door, and 9 be heat exchanger, and 10 be flue gas on-line detecting system, and 11 be switch valve,
12 be sampled point, and 13 be water treatment system, and 14 be water replanishing device, and 15 be condensed water outlet pipe.
Specific implementation mode
With reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
Referring to Fig. 1, a kind of efficient control device of gas fired-boiler nitrogen oxides, including boiler body 1, burner 2, dry system
System 3, catalyst reaction device 4, residual heat using device 6, water treatment system 13, water replanishing device 14 and flue gas on-line detecting system 10；
The burner 2 is connected to boiler body 1, the baffle door that the exhanst gas outlet pipeline of boiler body 1 is arranged by drying system
Be connected to afterwards with drying system 3, drying system 3 by being connected to catalyst reaction device 4 after the baffle door and flue that are arranged thereon,
The exhanst gas outlet pipeline of catalyst reaction device 4 is connect by air-introduced machine 5 with residual heat using device 6, and the outlet of residual heat using device 6 connects
Connect external smoke discharging pipe, residual heat using device 6 is separately connected water treatment system 13 and water replanishing device 14, boiler body 1 also with benefit
Water installations 14 are connected, and flue gas on-line detecting system 10 is also associated on the flue between drying system 3 and exhanst gas outlet.
3 lower section of drying system is provided with the drying unit 7 dried to its drier by baffle door, dries
7 other side of device connects heat exchanger 9 by the baffle door and flue being arranged on drying system, and heat exchanger 9 is separately connected at water
Reason system 13 and water replanishing device 14.Boiler shutdown state, drying system and boiler body and catalysis are in when drying unit works
The baffle door of reaction unit connection is closed, and other two baffle door is in open state.
Between the drying system 3 and catalyst reaction device 4, between catalyst reaction device 4 and air-introduced machine 5, waste heat profit
With sampled point 12 is both provided between device 6 and exhanst gas outlet, multiple sampled points 12 are connected to flue gas by switch valve 11 and exist
In the control system of line detecting system 10.
The residual heat using device 6 is connect by condensed water outlet pipe 15 with water treatment system 13.
The burner 2 is low NO, porous water-absorbing material built in drying system.
The porous water-absorbing material is heat-resisting porous dry agent, the flue gas gone out for dry pot fire grate.
The catalyst reaction device is built-in with board-like, corrugated or cellular catalyst module, and there is load in module contains
The catalyst for having noble metal active ingredient, the redox reaction for being catalyzed nitrogen oxides in effluent and carbon monoxide；Reaction
Formula is：NO+CO→N2+CO2。
The catalyst containing noble metal active ingredient is Pda-Rhb/(CoOx)c(MnOx)d, wherein 0<A≤0.2,0
<B≤0.2,0<C≤0.8,0<d≤0.7；Wherein, the reaction temperature window of this catalyst is 50-350 DEG C.
The residual heat using device be heat exchanger, energy-saving appliance or economizer, can also be with other residual heat using device shapes
Formula exists, and the circulation in heat exchanger is connect with water replanishing device, and a small amount of condensed water that heat exchanger generates passes through condensate pipe
Into water treatment system.
The water treatment system is also connected with water replanishing device, water treatment system include medicine storing pot, medicine adding controller and
Water tank, a small amount of condensed water that a large amount of condensed waters and residual heat using device for collecting and handling heat exchanger generation generate, and
The water supply being newly added, treated, and water enters water replanishing device.
Specifically, drying system is connect with catalyst reaction device by flue, between be equipped with baffle door.
Preferably, the burner is low NO, is used for the ignition burning device of gas fired-boiler, is fired by low nitrogen
Burning technology reduces the yield of nitrogen oxides on source, and original discharge concentration can be controlled in 80mg/Nm3Below.The combustion
The display of burner and control system can merge with boiler control system or independently of boiler control system.
The drying system, built-in porous water-absorbing material can be but be not limited only to heat-resisting porous dry agent, for doing
The flue gas of dry boiler discharge, and moisture is precipitated at a higher temperature.
The catalyst reaction device, catalyst reaction device are built-in with board-like, corrugated or cellular catalyst module, mould
Load has the catalyst containing noble metal isoreactivity ingredient on block, the oxidation for being catalyzed nitrogen oxides in effluent and carbon monoxide
Reduction reaction.Reaction equation is：NO+CO→N2+CO2。
The catalyst containing noble metal isoreactivity ingredient is Pda-Rhb/(CoOx)c(MnOx)d, wherein 0<a≤
0.2,0<B≤0.2,0<C≤0.8,0<d≤0.7.The reaction temperature window of this catalyst is 50-350 DEG C.By to burned
Journey is optimized and revised, and 80% or more denitration efficiency can be achieved in the Gas Parameters such as control CO production quantities, catalysis reaction.
To overcome the resistance of drying system and catalyst reaction device, the cigarette that catalyst reaction device is connect with residual heat using device
Air-introduced machine is equipped in road.
The residual heat using device can by but be not limited only to exist in the form of heat exchanger, following in residual heat using device
Ring water system is connect with boiler replenishing water device, and for exchanging heat with boiler smoke, the moisture of heating boiler supplement recycles
Fume afterheat；After a small amount of condensed water that device generates enters water treatment system by condensate pipe, into water replanishing device.
Further, the invention also includes drying units, and boiler shutdown state, drying system are in when drying unit works
The baffle door being connect with boiler body and catalyst reaction device is closed.Drying unit side is connected with drying system,
The other side is connect by flue with heat exchanger, utilization and condensation for air waste heat after drying drier and drying.Heat exchanger
Recirculated water come from boiler replenishing water device, heat exchanger generate a large amount of condensed water enter water treatment system processing after enter moisturizing
Device.The control system of the drying unit can merge with boiler control system or independently of boiler implosion system
System.
The flue gas on-line detecting system, detection catalyst reaction device flue is front and back and system exhanst gas outlet at
Divide concentration, each constituent concentration of detection smoke outlet flue gas, and the performance for judging catalyst is applied not only to, as catalysis
Foundation whether agent is replaced.The display of the flue gas on-line detecting system and control system can both be closed with boiler control system
And it can also be independently of boiler control system.
The water treatment system, including medicine storing pot, medicine adding controller and water tank (not shown here), for collecting simultaneously
Handle heat exchanger generate a large amount of condensed waters and flue gas residual heat using device generate a small amount of condensed water, and be newly added to
Water, treated, and water enters water replanishing device.
The water replanishing device, the recirculated water for providing flue gas waste heat utilization device and drying unit heat exchanger receive
Water treatment system treated water and supplement boiler institute water shortage point.
Major pollutants are nitrogen oxides in the flue gas that gas fired-boiler generates, and the present invention is using low-NO_x combustion technology and catalysis
Nitrogen technology is dropped, additional reducing agent and flue gas outer circulation pipeline are not needed, you can reaches current discharge standard, easy to operate, peace
Quan Xinggao.Meanwhile the present invention dries boiler export flue gas, reduces catalyst water intoxication degree, improves catalysis effect
Fruit extends catalyst service life；Drier may be reused, and reduce cost.System dries fume afterheat and drier
The heat of generation carries out reuse, reduces energy waste, total environment benefit and remarkable in economical benefits.
A kind of efficient control method of gas fired-boiler nitrogen oxides based on above-mentioned apparatus, includes the following steps：
1) when boiler normal use, the concentration that boiler body burning generates is in 80mg/Nm3Flue gas below passes through fume pipe
Road enters in drying system, and the drier in drying system is to concentration in 80mg/Nm3Vapor in flue gas below is done
It is dry, vapor is removed, catalyst water intoxication is prevented；
2) flue gas enters catalyst reaction device by baffle door via flue after drying system is dried, containing expensive
Under the action of the catalyst of metal active ingredient, the nitrogen oxides in flue gas carries out redox reaction with nitric oxide, is not necessarily to
Reducing agent is additionally incorporated, NOx in flue gas is made to reach discharge standard with CO concentration；Reaction equation is：NO+CO→N2+CO2；After reaction
Purifying smoke enters residual heat using device after air-introduced machine；
3) it is discharged into air after carrying out heat exchange with circulatory mediator therein into the purifying smoke of residual heat using device, simultaneously
Always Online" detection is carried out to flue gas using flue gas on-line detecting system；The a large amount of condensed water that residual heat using device generates enters
Water treatment system processing；
4) when boiler shutdown, the baffle door that drying system is connect with boiler body and catalyst reaction device is in closing shape
State, other two baffle door is in open state on drying system, and drying unit dries the drier in drying system,
Drier is set to may be reused；
5) wet air after drying passes through the heat exchanger being connect with drying unit and is utilized to air preheat.
The efficient control device and method of gas fired-boiler nitrogen oxides provided by the invention is asked for existing gas fired-boiler drop nitrogen
Topic, the present invention is not necessarily to additional reducing agent, easy to operate, while preventing catalyst water intoxication, improves using effect, extends catalyst
Service life, and system recycles the waste heat generated during flue gas emission with condensed water, total environment effect
Benefit and remarkable in economical benefits.
(1) novel to use low nitrogen compared with conventional gas boiler low-NO_x combustion technology and tail portion SCR and SNCR denitration technology
Combustion technology and catalysis drop nitrogen technology, do not need additional reducing agent and flue gas outer circulation pipeline, you can reach current discharge mark
Standard, the low nitrogen transformation of boiler is convenient, easy to operate, safe.
(2) present invention dries boiler export flue gas, reduces catalyst water intoxication degree, improves catalysis effect
Fruit extends catalyst service life；Drier may be reused, and reduce cost.
(3) heat that system generates fume afterheat and drier drying carries out reuse, reduces energy waste.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (10)
1. a kind of efficient control device and method of gas fired-boiler nitrogen oxides, which is characterized in that including boiler body (1), burning
Device (2), drying system (3), catalyst reaction device (4), residual heat using device (6), water treatment system (13), water replanishing device (14)
And flue gas on-line detecting system (10)；The burner (2) is connected to boiler body (1), the exhanst gas outlet of boiler body (1)
It is connected to drying system (3) after the baffle door that pipeline is arranged by drying system, drying system (3) passes through the baffle that is arranged thereon
It is connected to catalyst reaction device (4) after door and flue, the exhanst gas outlet pipeline of catalyst reaction device (4) passes through air-introduced machine (5)
It is connect with residual heat using device (6), the external smoke discharging pipe of residual heat using device (6) outlet connection, residual heat using device (6) is respectively
Connection water treatment system (13) and water replanishing device (14), boiler body (1) are also connected with water replanishing device (14), drying system (3)
Flue gas on-line detecting system (10) is also associated on flue between exhanst gas outlet.
2. the efficient control device of gas fired-boiler nitrogen oxides according to claim 1, which is characterized in that the dry system
The drying unit (7) dried to its drier is provided with by baffle door below system (3), drying unit (7) other side is logical
It crosses the baffle door being arranged on drying system and flue connection heat exchanger (9), heat exchanger (9) is separately connected water treatment system (13)
With water replanishing device (14).
3. the efficient control device of gas fired-boiler nitrogen oxides according to claim 1, which is characterized in that the dry system
Unite between (3) and catalyst reaction device (4), between catalyst reaction device (4) and air-introduced machine (5), residual heat using device (6) and cigarette
Gas is both provided with sampled point (12) between outlet, and multiple sampled points (12) are connected to flue gas on-line checking by switch valve (11)
In the control system of system (10).
4. the efficient control device of gas fired-boiler nitrogen oxides according to claim 1, which is characterized in that the burner
(2) it is low NO, residual heat using device (6) is connect by condensed water outlet pipe (15) with water treatment system (13).
5. the efficient control device of gas fired-boiler nitrogen oxides according to claim 1, which is characterized in that the dry system
The built-in porous water-absorbing material of system.
6. the efficient control device of gas fired-boiler nitrogen oxides according to claim 5, which is characterized in that the porous suction
Water material is heat-resisting porous dry agent, the flue gas gone out for dry pot fire grate.
7. the efficient control device of gas fired-boiler nitrogen oxides according to claim 1, which is characterized in that the catalysis is anti-
Device is answered to be built-in with board-like, corrugated or cellular catalyst module, being loaded in module has urging containing noble metal active ingredient
Agent, the redox reaction for being catalyzed nitrogen oxides in effluent and carbon monoxide；Reaction equation is：NO+CO→N2+CO2。
8. the efficient control device of gas fired-boiler nitrogen oxides according to claim 7, which is characterized in that described containing is expensive
The catalyst of metal active ingredient is Pda-Rhb/(CoOx)c(MnOx)d, wherein 0<A≤0.2,0<B≤0.2,0<C≤0.8,0<d
≤0.7；Wherein, the reaction temperature window of this catalyst is 50-350 DEG C.
9. the efficient control device of gas fired-boiler nitrogen oxides according to claim 1, which is characterized in that the waste heat profit
It is heat exchanger, energy-saving appliance or economizer with device, the circulation in heat exchanger is connect with water replanishing device, what heat exchanger generated
A small amount of condensed water enters water treatment system by condensate pipe；
The water treatment system is also connected with water replanishing device, and water treatment system includes medicine storing pot, medicine adding controller and water tank,
A small amount of condensed water that a large amount of condensed waters and residual heat using device for collecting and handling heat exchanger generation generate, and new addition
Water supply, treated, and water enters water replanishing device.
10. a kind of efficient control method of gas fired-boiler nitrogen oxides based on any one of claim 1~9 described device, special
Sign is, includes the following steps：
1) when boiler normal use, the concentration that boiler body burning generates is in 80mg/Nm3Flue gas below by flue into
Enter in drying system, the drier in drying system is to concentration in 80mg/Nm3Vapor in flue gas below is dried,
Vapor is removed, catalyst water intoxication is prevented；
2) flue gas enters catalyst reaction device by baffle door via flue after drying system is dried, and is containing noble metal
Under the action of the catalyst of active constituent, the nitrogen oxides in flue gas carries out redox reaction with nitric oxide, and reaction equation is：
NO+CO→N2+CO2；Purifying smoke after reaction enters residual heat using device after air-introduced machine；
3) it is discharged into air after carrying out heat exchange with circulatory mediator therein into the purifying smoke of residual heat using device, is used simultaneously
Flue gas on-line detecting system carries out Always Online" detection to flue gas；The a large amount of condensed water that residual heat using device generates enters at water
The processing of reason system；
4) when boiler shutdown, the baffle door that drying system is connect with boiler body and catalyst reaction device is closed, and is done
Other two baffle door is in open state on drying system, and drying unit dries the drier in drying system, makes to do
Drying prescription may be reused；
5) wet air after drying passes through the heat exchanger being connect with drying unit and is utilized to air preheat.
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| CN109338052A (en) * | 2018-09-29 | 2019-02-15 | 中冶南方（武汉）热工有限公司 | Reduce the radiant tube exhaust system and method for discharged nitrous oxides |
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