CN206008468U - A kind of flue gas denitrification system for coal water slurry boiler - Google Patents
A kind of flue gas denitrification system for coal water slurry boiler Download PDFInfo
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- CN206008468U CN206008468U CN201620932836.XU CN201620932836U CN206008468U CN 206008468 U CN206008468 U CN 206008468U CN 201620932836 U CN201620932836 U CN 201620932836U CN 206008468 U CN206008468 U CN 206008468U
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Abstract
The utility model is related to a kind of flue gas denitrification system for coal water slurry boiler.The system includes that SCR reactor assemblies, SCR reactor assemblies include SCR reactors and spray ammonia grid；The gas approach of the exhaust gases passes of SCR reactors is connected with the exhanst gas outlet of coal water slurry boiler；The ammonia outlet of spray ammonia grid is located in the exhaust gases passes of SCR reactors, between the outlet of spray ammonia grid and the exhaust gases passes of SCR reactors is provided with catalyst.During process, the flue gas of coal water slurry boiler is passed through SCR reactors, ammonia is mixed with the flue gas of coal water slurry boiler by spraying ammonia grid and entering exhaust gases passes, after through catalyst treatment.Flue gas denitrification system for coal water slurry boiler of the present utility model is the first smoke processing system for coal water slurry boiler, good have the advantages that fume treatment effect.
Description
Technical field
The utility model belongs to fume treatment field, more particularly to a kind of flue gas denitrification system for coal water slurry boiler.
Background technology
Coal water slurry boiler refers to the boiler using water-coal-slurry for fuel.Water-coal-slurry be a kind of by 70% or so coal dust,
The liquid that 30% or so water and a small amount of medicament are mixed with, sends into burner after steam atomization with jet by slurry supply pump
Mode enters burner hearth, promotes coal slurry air-flow to produce with red-hot flue gas and mixes strongly, and moisture evaporates rapidly, and water-coal-slurry particle is obtained
Enough heats have simultaneously reached certain temperature and have begun to ignition.Water-coal-slurry is passed through in the high-temperature flue gas that stove chamber inner combustion is produced
Discharge from boiler tail after the heat-exchanger rigs such as boiler tube bundle, economizer, air preheater, but flue gas needs through denitration, dedusting, takes off
The techniques such as sulphur are processed, and after reaching environment protection standard discharge standard, could enter air by chimney, the few lime-ash after burning
Discharged out of the furnace by dreg removing system.
With Qingdao Hou Hai thermoelectricity 1, as a example by 2# coal water slurry boilers, Qingdao Hou Hai thermoelectricity 1, the water used by 2# coal water slurry boilers
Coal slurry moisture 33%, employs steam atomization again, causes steam content in flue gas high, while fuel holds during cool water mixture burning
Easy to knot groups, more difficult than general pulverized-coal fired boiler after-flame, this is particularly designing quality and the use of SCR reactors to whole denitrating system
Life-span proposes very high requirement.
Utility model content
In view of the problems of prior art, a kind of denitrating flue gas system for coal water slurry boiler of the utility model offer
System and the method for denitrating flue gas, it is adaptable to coal water slurry boiler, with fume treatment effect good, quality is good, long service life and have
Beneficial to the advantages of environmental protection.
The technical scheme that the utility model solves above-mentioned technical problem is as follows：
A kind of flue gas denitrification system for coal water slurry boiler, including SCR reactor assemblies, the SCR reactor assemblies
Including SCR reactors and spray ammonia grid；
The gas approach of exhaust gases passes of the SCR reactors is connected with the exhanst gas outlet of coal water slurry boiler；Spray ammonia grid
Ammonia entrance be used for being passed through ammonia or the mixed gas containing ammonia, the ammonia outlet for spraying ammonia grid is located at SCR reactors
In exhaust gases passes, between the outlet of spray ammonia grid and the exhaust gases passes of SCR reactors, it is provided with catalyst；Ammonia contains ammonia
The mixed gas of gas enter to the nitrogen in the flue gas produced after exhaust gases passes with coal water slurry boiler from the ammonia entrance of spray ammonia grid
Nitrogen is generated through catalyst reaction after oxide mixing.
SCR is that the English of selective catalytic reduction (Selective Catalytic Reduction) is write a Chinese character in simplified form, its principle
It is reducing agent NH under catalyst action3Selectively by NO and NO at 290-400 DEG C2It is reduced into N2, and hardly occur
NH3With O2Oxidation reaction, so as to improve N2Selectivity, reduce NH3Consumption.
The beneficial effects of the utility model are：
The utility model proposes the process of the denitrating flue gas that SCR reactor assemblies are applied to coal water slurry boiler first
In.
In design coal, boiler maximum duty (BMCR), under the conditions of processing 100% exhaust gas volumn, it is ensured that boiler export flue gas
Middle NOx emission concentration<50mg/Nm3(dry flue gas, 6% oxygen content), realizes coal water slurry boiler denitrating flue gas minimum discharge.
On the basis of above-mentioned technical proposal, the utility model can also do following improvement.
Further, the spray ammonia grid includes main line and branch pipeline, and one end of main line is ammonia entrance, main line
The other end is connected with one end of branch pipeline, and the branch pipeline is provided with multiple and is connected with the other end of main line respectively, each point
The other end of pipeline is provided with multiple grids, and grid is distributed with hole, and the grid is located in exhaust gases passes, for by ammonia or containing
The mixed gas of ammonia are passed through exhaust gases passes.
Using the beneficial effect of such scheme it is：Ammonia is made to enter into through main line and branch line by spraying ammonia grid
In the flue of SCR reactors, mix with the flue gas in flue, being provided with for multiple grids is fully mixed with ammonia beneficial to flue gas
Even.
Further, any one or several is mixed selected from titanium dioxide, vanadic anhydride, in tungstic acid for the catalyst
Close.Preferably, the catalyst is vanadic anhydride.
Using the beneficial effect of such scheme it is：The species of catalyst has material impact to catalytic performance.Inventor exists
It is found surprisingly that in research, using the catalyst of mentioned kind, there is very high catalytic effect, is conducive to ammonia to be catalyzed into nitrogen
Gas, is discharged so as to meet discharge standard.
Further, one section of passage in the exhanst gas outlet near exhaust gases passes is vertically arranged.
Further, the catalyst is provided with three layers, arranges, using 2+1 arrangement sides under three layers of catalyst in the vertical direction
Formula.
Described 2+1 arrangements, refer to wherein two-layer catalyst and are fixedly installed in exhaust gases passes, in addition urge for one layer
Agent is removably arranged in exhaust gases passes, and in addition one layer of catalyst can choose whether to be placed on flue gas as the case may be
In passage.
Using the beneficial effect of such scheme it is：Using three layers of catalyst, catalytic efficiency can be significantly improved.
Further, the SCR reactors are also equipped with flue gas disturbing flow device, reactor inlet temperature measurement apparatus, reaction
Device differential pressure measuring installation, reactor leaving water temperature measurement apparatus, reactor outlet ammonia escape detection means, reactor outlet nitrogen
Oxygen compound testing equipment, high-level alarming device and acoustic wave ash ejector；
The flue gas disturbing flow device installed in catalyst top, ammonia mix with flue gas after gas through flue gas disturbing flow device
Afterwards again through catalyst；
The reactor inlet temperature measurement apparatus are arranged on the porch of exhaust gases passes；
Reactor differential pressure measuring installation is arranged at catalyst, for detecting the differential pressure at the top and bottom of catalyst；
Reactor leaving water temperature measurement apparatus, reactor outlet ammonia escape detection means, high-level alarming device and reaction
Device outlet oxynitrides testing equipment is arranged on the exit of exhaust gases passes；
The acoustic wave ash ejector is arranged on the top of catalyst.
Using the beneficial effect of such scheme it is：
Being provided with for flue gas disturbing flow device is beneficial to make the distribution of flue gas more uniform.
The flue-gas temperature being provided with beneficial to detection entrance of reactor inlet temperature measurement apparatus, if it find that temperature mistake
Low, can stop feeding ammonia, because if temperature is crossed, low reaction is more difficult to be carried out, it is to avoid waste ammonia.
Reactor differential pressure measuring installation and the setting of high-level alarming device, when reactor differential pressure is higher than warning arranges value,
Illustrate that catalyst blockage is serious, should stop spraying ammonia, while needing to detect acoustic wave ash ejector whether normal operation.
Reactor outlet ammonia escape detection means and reactor outlet oxynitrides testing equipment, the equipment can be right
SCR storages and distribution system carry out on-line control, and so as to adjust the amount of spray ammonia, final guarantee outlet NOx content is not more than 50mg/
Nm3, the escapement ratio of ammonia is not more than 3ppm.
The setting of acoustic wave ash ejector ensures that catalyst top and inside do not occur dust stratification situation, and avoid because of dead angle dust stratification and
Catalyst failure is caused to cause the decline of denitration efficiency.
Further, also include that ammoniacal liquor vapo(u)rization system, the ammoniacal liquor vapo(u)rization system are used for preparing ammonia or mixed containing ammonia
Close gas；The ammonia outlet of the ammoniacal liquor vapo(u)rization system is connected with the ammonia entrance of the spray ammonia grid of SCR reactors.
Using the beneficial effect of such scheme it is：Ammoniacal liquor is changed into by ammonia by ammoniacal liquor vapo(u)rization system, is reacted for SCR
Denitration process are carried out in device system.
Further, the ammoniacal liquor vapo(u)rization system includes：Ammoniacal liquor evaporator tank, injector and booster fan, the ammoniacal liquor evaporation
Ammonia outlet is provided with the top of groove, the bottom of the ammoniacal liquor evaporator tank is provided with air inlet, the injector is evaporated installed in ammoniacal liquor
The middle part of groove；
The Secondary Air of coal water slurry boiler is entered in ammoniacal liquor evaporator tank from air inlet by booster fan, and booster fan is used for
Ammoniacal liquor is made to evaporate to form the mixed gas containing ammonia；
During ammoniacal liquor is sprayed to ammoniacal liquor evaporator tank through injector, after mixing with the booster fan wind that comes of conveying, generation contains
The mixed gas of ammonia, the mixed gas containing ammonia are passed through in spray ammonia grid by the ammonia outlet of ammoniacal liquor evaporator tank.
Using the beneficial effect of such scheme it is：Ammoniacal liquor is entered in injector, is divided ammoniacal liquor using the Secondary Air of boiler
Solve as ammonia and water, ammonia is used for SCR reactor assemblies.
Further, also include cooling circuit, for cooling down booster fan.
Using the beneficial effect of such scheme it is：By the setting of cooling device, be conducive to the service life of extension device.
Further, ammoniacal liquor storage and distribution system, the ammoniacal liquor storage and the ammoniacal liquor outlet of distribution system and ammonia are also included
The ammonia inlet connection of water evaporation system.
Using the beneficial effect of such scheme it is：For storing ammoniacal liquor, can be according to the used in amounts of SCR reactor assemblies
Ask, ammoniacal liquor is provided for SCR reactor assemblies.
Further, the ammoniacal liquor storage and distribution system include：Tank used for storing ammonia and ammoniacal liquor conveying device, are stored in ammoniacal liquor storage
Ammoniacal liquor in tank is delivered to ammoniacal liquor vapo(u)rization system by ammoniacal liquor conveying device, and unnecessary ammoniacal liquor is back in tank used for storing ammonia and is followed
Ring is utilized.
Using the beneficial effect of such scheme it is：Tank used for storing ammonia is used for storing ammoniacal liquor, and ammoniacal liquor supplies SCR reactor assemblies,
Unnecessary ammoniacal liquor can be back in tank used for storing ammonia, have the advantages that saving ammoniacal liquor.
The utility model also provides a kind of denitration method for flue gas of above-mentioned coal water slurry boiler, comprises the following steps：
The flue gas of coal water slurry boiler is passed through in the exhaust gases passes of SCR reactors, ammonia is entered cigarette by spraying ammonia grid
Gas passage is mixed with the flue gas of coal water slurry boiler, after directly discharge or be passed through through catalyst treatment, the product obtained after process
Other equipment.
Using the beneficial effect of such scheme it is：
The utility model achieves the minimum discharge requirement of coal water slurry boiler first (less than 50mg/Nm3), the original rows of NOx
Value height (800mg/Nm3) is put, denitration efficiency has high demands, 93% can be more than.
Description of the drawings
Fig. 1 is a kind of method of flue gas denitrification system and denitrating flue gas for coal water slurry boiler described in the utility model
Connection diagram；
Fig. 2 is the structural representation of ammoniacal liquor storage described in the utility model and distribution system；
Fig. 3 is the structural representation of ammoniacal liquor vapo(u)rization system described in the utility model；
Structural representations of the Fig. 4 for the utility model SCR reactor assemblies；
Fig. 5 is the structural representation for spraying ammonia grid.
In accompanying drawing, the list of parts representated by each label is as follows：
1st, ammoniacal liquor storage and distribution system, 11, tank used for storing ammonia, 12, ammoniacal liquor conveying device, 2, ammoniacal liquor vapo(u)rization system, 21, spray
Emitter, 22, booster fan, 23, ammoniacal liquor evaporator tank, 3, SCR reactor assemblies, 4, SCR reactors, 41, exhaust gases passes, 42, urge
Agent, 43, flue gas disturbing flow device, 44, reactor inlet temperature measurement apparatus, 45, reactor differential pressure measuring installation, 46, reaction
Device leaving water temperature measurement apparatus, 47, reactor outlet ammonia escape detection means, 48, the detection of reactor outlet oxynitrides
Equipment, 5, spray ammonia grid, 51, main line, 52, branch pipeline, 521, grid, 6, boiler secondary air, 7, factory's cooling water, 8, cooling
Water backwater.
Specific embodiment
Principle of the present utility model and feature are described below in conjunction with accompanying drawing, example is served only for explaining this practicality
New, it is not intended to limit scope of the present utility model.
As Figure 1-5, a kind of flue gas denitrification system for coal water slurry boiler, including ammoniacal liquor store and distribution system 1,
Ammoniacal liquor vapo(u)rization system 2 and SCR reactor assemblies 3.As shown in figure 1, the ammoniacal liquor storage and distribution system 1 and ammoniacal liquor vapo(u)rization system
2 connections, the ammoniacal liquor vapo(u)rization system 2 and SCR reactor assemblies 3.
As shown in Fig. 2 the ammoniacal liquor outlet of ammoniacal liquor storage and distribution system 1 is connected with the ammonia inlet of ammoniacal liquor vapo(u)rization system 2.
The ammoniacal liquor storage and distribution system 1 include：Tank used for storing ammonia 11 and ammoniacal liquor conveying device 12, the ammonia being stored in tank used for storing ammonia 11
Water is delivered to ammoniacal liquor vapo(u)rization system 2 by ammoniacal liquor conveying device 12, and unnecessary ammoniacal liquor is back in tank used for storing ammonia 11 and is circulated
Utilize.
In one embodiment of the present utility model, ammoniacal liquor conveying device 12 is ammonium hydroxide delivery pump, and each storage tank is furnished with many
Individual ammonium hydroxide delivery pump.The quantity of tank used for storing ammonia 11 can also select multiple.Ammoniacal liquor is delivered to ammoniacal liquor storage using ammonium hydroxide delivery pump
After tank 11, recycle ammonium hydroxide delivery pump that ammoniacal liquor is delivered to ammoniacal liquor vapo(u)rization system 2, unnecessary ammoniacal liquor can pass through ammonium hydroxide delivery pump
Return to tank used for storing ammonia 11 and be circulated utilization.
Ammoniacal liquor from ammoniacal liquor induction system enters ammoniacal liquor vapo(u)rization system, the thermal source of ammoniacal liquor evaporation through metering distribute module
From boiler hot Secondary Air, hot Secondary Air is drawn from hot secondary air duct by high-temperature blower, enters ammoniacal liquor and steam after blower fan supercharging
Device is sent out, for example：Mass concentration is that 20% ammoniacal liquor is vaporized and diluted by the heating of hot Secondary Air in evaporimeter, subsequently into boiler
The spray ammonia grid of SCR reactor assemblies.
As shown in figure 3, the ammoniacal liquor vapo(u)rization system 2 is used for preparing ammonia or the mixed gas containing ammonia, the ammoniacal liquor
The ammonia outlet of vapo(u)rization system is connected with the ammonia entrance of the spray ammonia grid of SCR reactor assemblies.The ammoniacal liquor vapo(u)rization system 2 is wrapped
Include：Ammoniacal liquor evaporator tank 23, injector 21 and booster fan 22, the top of the ammoniacal liquor evaporator tank 23 are provided with ammonia outlet, described
The bottom of ammoniacal liquor evaporator tank 23 is provided with air inlet, and the injector 21 is installed in the middle part of ammoniacal liquor evaporator tank 23；
The injector 21 can be provided with multiple, and multiple injectors 21 are being arranged up and down；
Coal water slurry boiler Secondary Air 6 is entered in ammoniacal liquor evaporator tank 23 from air inlet by booster fan 22, booster fan
22 are used for evaporating ammoniacal liquor to form the mixed gas containing ammonia；
During ammoniacal liquor is sprayed to ammoniacal liquor evaporator tank 23 through injector 21, after mix with the wind that comes of conveying of booster fan 22, product
The raw mixed gas containing ammonia, the mixed gas containing ammonia are passed through spray ammonia grid 5 by the ammonia outlet of ammoniacal liquor evaporator tank 23
In.
The ammoniacal liquor vapo(u)rization system 2 also includes cooling device, for cooling to booster fan 22, it is to avoid temperature is too high
The service life of impact equipment, factory's cooling water 7 obtain cooling water backwater 8 for increasing after blower fan is lowered the temperature.
By the way of above-mentioned bottom air inlet top goes out ammonia, the production efficiency for preparing ammonia can be improved.
As shown in figure 4, the SCR reactor assemblies 3 include SCR reactors 4 and spray ammonia grid 5；
The gas approach of exhaust gases passes 41 of the SCR reactors 4 is connected with the exhanst gas outlet of coal water slurry boiler；Spray ammonia grid
The ammonia entrance of lattice 5 is used for being passed through ammonia or the mixed gas containing ammonia, sprays ammonia entrance and the ammoniacal liquor evaporation system of ammonia grid 5
The ammonia outlet connection of system 2, the ammonia outlet for spraying ammonia grid 5 are located in the exhaust gases passes 41 of SCR reactors 4, in spray ammonia grid 5
Catalyst 42 is provided with and the outlet of the exhaust gases passes 4 of SCR reactors 4 between, and ammonia or the mixed gas containing ammonia are from spray
Nitrogen oxides in the flue gas that the ammonia entrance of ammonia grid 5 is produced with coal water slurry boiler after entering to exhaust gases passes 41 is passed through after mixing
Catalyst reaction generates nitrogen.
As shown in figure 5,5 lattice of spray ammonia grid include that main line 51 and branch pipeline 52, one end of main line 51 enter for ammonia
Mouthful, the other end of main line 51 is connected with one end of branch pipeline 52, the branch pipeline 52 be provided with multiple and respectively with main line
The other end connects, and the other end of each branch pipeline 52 is provided with multiple grids 521, and grid 521 is distributed with through hole, the grid 521
It is located in exhaust gases passes 41, for ammonia or mixed gas containing ammonia are passed through in exhaust gases passes 41.
The catalyst 42 is selected from the mixing of any one or several in titanium dioxide, vanadic anhydride, tungstic acid.
It is vertically arranged in one section of passage of the exhanst gas outlet near exhaust gases passes 41.
The catalyst 42 is provided with three layers, arranges, using 2+1 arrangements under three layers of catalyst in the vertical direction.?
In one embodiment of the present utility model, the catalyst is cellular catalyst.
The SCR reactors 4 are also equipped with flue gas disturbing flow device 43, reactor inlet temperature measurement apparatus 44, reactor
Differential pressure measuring installation 45, reactor leaving water temperature measurement apparatus 46, reactor outlet ammonia escape detection means 47, reactor goes out
Mouth oxynitrides testing equipment 48, high-level alarming device and acoustic wave ash ejector；
The flue gas disturbing flow device 43 installed in catalyst 42 top, ammonia mix with flue gas after gas through flue gas flow-disturbing
It is catalyzed through catalyst 42 after device 43 again；
The reactor inlet temperature measurement apparatus 44 are arranged on the porch of exhaust gases passes；
Reactor differential pressure measuring installation 45 is arranged at catalyst 42, for detecting the difference at the top and bottom of catalyst
Pressure；
Reactor leaving water temperature measurement apparatus 46, reactor outlet ammonia escape detection means 47, high-level alarming device set
Put the exit that exhaust gases passes are arranged on reactor outlet oxynitrides testing equipment 47；
The acoustic wave ash ejector is arranged on the top of catalyst 42, and every layer of catalyst is equipped with acoustic wave ash ejector.
Using the reaction principle and method of above-mentioned denitrating flue gas it is：
The exhaust gases passes 41 that the flue gas of coal water slurry boiler is passed through SCR reactors 4, ammonia is entered by spraying ammonia grid 5
Exhaust gases passes 41 are mixed with the flue gas of coal water slurry boiler, after process through catalyst 42, the product obtained after process is directly discharged
Or it is passed through other equipment.
Following operation can specifically be adopted：
(1) ammonia concn for controlling ammoniacal liquor storage and distribution system 1 is 17%-20%；
(2) mixed gas containing ammonia are prepared：
Ammoniacal liquor is stored and the ammoniacal liquor of distribution system 1 is passed through ammoniacal liquor evaporator tank 23, the ammoniacal liquor consumption is 220kg/h, ammonia
Water pressure is 0.5-0.6Mpa, and temperature is 20 DEG C.
Boiler secondary air 6 is delivered to injector 21 through booster fan to spray to ammoniacal liquor evaporator tank 23, fans entrance two
Secondary wind parameter is：Flow 1540Nm3/ h, fans entrance pressure 3000Pa, temperature are 340 DEG C.Using above-mentioned parameter, be conducive to carrying
Height prepares the production efficiency of ammonia.
Ammoniacal liquor is evaporated using boiler secondary air 6, the mixed gas containing ammonia are obtained.
(3) denitration reaction is carried out：
Through hole of the mixed gas containing ammonia through spraying the grid of ammonia grid 5 is sprayed into SCR reactors, the spray ammonia grid
The diameter range of the through hole of 5 grid is 5-6mm, and ammonia is more than 16m/s from the flow velocity that the through hole of spray ammonia grid 5 sprays, with
When the flue gas that coal water slurry boiler is produced is passed through in flue, the mixed gas containing ammonia are mixed with flue gas, the ammonia and cigarette
In gas, nitric oxide production mol ratio is (0.95-1)：1, after process through catalyst 42, flue gas stream at each layer of catalyst inlet
Fast relative deviation≤15%；At each layer of catalyst inlet, ammonia nitrogen is than distribution relative deviation≤5%；At each layer of catalyst inlet
Dump angle degree≤10 °, catalyst aperture is 7-8mm, specific surface area is 460-470m2/m3, porosity be 75%-77%,
Denitration surface area is 9.3-9.8m2, catalyst amount is 35-36m3, 310 DEG C of the minimum continuous spray ammonia temperature of SCR device, highest connects
420 DEG C of continuous spray ammonia temperature, obtains nitrogen and water after catalytic reaction.
In order to ensure that the denitration efficiency of whole denitrating system, the designing quality of denitrating system and service life are required, first
CFD simulations are carried out to whole denitrating system, has determined that this engineering SCR reactors and connection flue set using method for numerical simulation
Meter, selects rational ammonia-spraying grid arrangement and is adjusted according to the actual condition of production.At each layer of catalyst inlet
Flue gas flow rate relative deviation≤15%；At each layer of catalyst inlet, ammonia nitrogen is than distribution relative deviation≤5%；Each layer of catalyst
Porch dump angle degree≤10 ° so that whole SCR denitration reactive flowfield is realized optimal in optimized state
Denitration effect.
The water-coal-slurry moisture 33% used by coal water slurry boiler, employs steam atomization again, causes steam in flue gas
Content is high, and has the generation of water in the accessory substance of SCR denitration reaction, and coal water slurry boiler smoke components moisture is big, can suppress
The carrying out of SCR denitration reaction, causes denitration effect to decline.Fuel easy conglomeration during cool water mixture burning, fires than general pulverized-coal fired boiler
Difficult to the greatest extent, fuel conglomeration is easily caused catalyst blockage dust stratification, Selection of Catalyst and choosing of the inventor in this Flue Gas Denitrification Engineering
Factors above is considered during amount, by selecting suitable catalyst aperture, specific surface area, porosity, denitration surface area and catalysis
Agent consumption etc., it is ensured that SCR denitration realizes that optimum optimization, catalytic inner should not occur dust stratification situation.Inventor was once carried out
Substantial amounts of screening of catalyst experiment, is found under study for action, and this Flue Gas Denitrification Engineering is being catalyzed using vanadium titanium tungsten catalyst is selected
During type selecting, main component has titanium dioxide (TiO2), vanadic anhydride (V2O5), tungstic acid (WO3) etc., catalyst adopts 2+1
Arrangement.
Inventor is found surprisingly that in numerous studies, when catalyst aperture be 7-8mm, specific surface area be 460-470m2/
m3, porosity be 75%-77%, denitration surface area be 9.3-9.8m2, catalyst amount is 35-36m3, de- efficiency now is most
Good, more than 93% can be reached.
Ammonia from ammoniacal liquor vapo(u)rization system 2 enters grid 521, and grid 521 is arranged in catalyst top.Ammonia is from grid
Aperture inside 521 flows out, and is sufficiently mixed with flue gas in exhaust gases passes 41 and then flows to catalyst through flue gas disturbing flow device 43
42, denitration chemical reaction is carried out inside catalyst 42.Chemical equation is as follows：
The arrangement form of SCR reactors is 2+1 layers.
4NO+4NH3+O2→4N2+6H2O；
6NO2+8NH3→7N2+12H2O；
NO+NO2+2NH3→2N2+3H2O；
Most ammonia is converted into nitrogen and water at last, after detection is qualified, with qualified discharge or can enter next operation.
310 DEG C of the minimum continuous spray ammonia temperature of SCR device, highest continuously sprays 420 DEG C of ammonia temperature.According to smoke dust content and
Flue size, arranges two acoustic wave ash ejectors on SCR reactors top, it is ensured that catalyst top and inside do not occur dust stratification feelings
Condition, and avoid causing catalyst failure to cause the decline of denitration efficiency because of dead angle dust stratification.
Three temperature points are evenly arranged on SCR catalyst reactor top, and design low-temperature warning, when temperature is less than
When 300 DEG C, should stop spraying ammonia.
SCR reactors arrange differential pressure measuring installation, and arrange high-level alarming device, when reactor differential pressure is higher than alarm setting
During value, illustrate that catalyst blockage is serious, should stop spraying ammonia, while needing to detect acoustic wave ash ejector whether normal operation.
In SCR reactor downstreams, NH is set3Escape testing equipment, reactor outlet (NOx, O2) detection etc. equipment, the equipment
Output valve can carry out on-line control to SCR meterings distribute module, and denitration outlet NOx content is not more than 50mg/Nm3, ammonia
Escapement ratio be not more than 3ppm.
Embodiment 1
The method that denitration is carried out using said system is comprised the following steps：
(1) ammonia concn of ammoniacal liquor storage and distribution system 1 is 17%；
(2) mixed gas containing ammonia are prepared：
Ammoniacal liquor is stored and the ammoniacal liquor of distribution system 1 is passed through ammoniacal liquor evaporator tank 23, the ammoniacal liquor consumption is 220kg/h, ammonia
Water pressure is 0.5Mpa, and temperature is 20 DEG C.
Boiler secondary air 6 is delivered to injector 21 through booster fan to spray to ammoniacal liquor evaporator tank 23, fans entrance two
Secondary wind parameter is：Flow 1540Nm3/ h, fans entrance pressure 3000Pa, temperature are 340 DEG C.Using above-mentioned parameter, be conducive to carrying
Height prepares the production efficiency of ammonia.
Ammoniacal liquor is evaporated using boiler secondary air 6, the mixed gas containing ammonia are obtained.
(3) denitration reaction is carried out：
Through hole of the mixed gas containing ammonia through spraying the grid of ammonia grid 5 is sprayed into SCR reactors, the spray ammonia grid
A diameter of 5mm of the through hole of 5 grid, ammonia are more than 16m/s from the flow velocity that the through hole of spray ammonia grid 5 sprays, while by water
The flue gas that fluid-fired boiler is produced is passed through in flue, and the mixed gas containing ammonia are mixed with flue gas, one in the ammonia and flue gas
The mol ratio of nitrogen oxide is 0.95：1, after process through catalyst 42, catalyst be titanium dioxide (TiO2), each layer of catalyst
Porch flue gas flow rate relative deviation≤15%；At each layer of catalyst inlet, ammonia nitrogen is than distribution relative deviation≤5%；Each layer
Dump angle degree≤10 ° at catalyst inlet, catalyst aperture is 7mm, specific surface area is 460m2/m3, porosity be 75%,
Denitration surface area is 9.3m2, catalyst amount is 35m3, 310 DEG C of the minimum continuous spray ammonia temperature of SCR device, highest continuously sprays ammonia temperature
420 DEG C of degree, obtains nitrogen and water after catalytic reaction.
Embodiment 2
The method that denitration is carried out using said system is comprised the following steps：
(1) ammonia concn of ammoniacal liquor storage and distribution system 1 is 20%；
(2) mixed gas containing ammonia are prepared：
Ammoniacal liquor is stored and the ammoniacal liquor of distribution system 1 is passed through ammoniacal liquor evaporator tank 23, the ammoniacal liquor consumption is 220kg/h, ammonia
Water pressure is 0.6Mpa, and temperature is 20 DEG C.
Boiler secondary air 6 is delivered to injector 21 through booster fan to spray to ammoniacal liquor evaporator tank 23, fans entrance two
Secondary wind parameter is：Flow 1540Nm3/h, fans entrance pressure 3000Pa, temperature are 340 DEG C.Using above-mentioned parameter, be conducive to carrying
Height prepares the production efficiency of ammonia.
Ammoniacal liquor is evaporated using boiler secondary air 6, the mixed gas containing ammonia are obtained.
(3) denitration reaction is carried out：
Through hole of the mixed gas containing ammonia through spraying the grid of ammonia grid 5 is sprayed into SCR reactors, the spray ammonia grid
A diameter of 6mm of the through hole of 5 grid, ammonia are more than 16m/s from the flow velocity that the through hole of spray ammonia grid 5 sprays, while by water
The flue gas that fluid-fired boiler is produced is passed through in flue, and the mixed gas containing ammonia are mixed with flue gas, one in the ammonia and flue gas
The mol ratio of nitrogen oxide is 1：1, after process through catalyst 42, catalyst be vanadic anhydride (V2O5), each layer of catalyst enters
Flue gas flow rate relative deviation≤15% at mouthful；At each layer of catalyst inlet, ammonia nitrogen is than distribution relative deviation≤5%；Each layer is urged
Agent porch dump angle degree≤10 °, catalyst aperture is 8mm, specific surface area is 470m2/m3, porosity be 75%-
77%th, denitration surface area is 9.8m2, catalyst amount is 36m3, 310 DEG C of the minimum continuous spray ammonia temperature of SCR device, highest is continuous
420 DEG C of spray ammonia temperature, obtains nitrogen and water after catalytic reaction.
Embodiment 3
The method that denitration is carried out using said system is comprised the following steps：
(1) ammonia concn of ammoniacal liquor storage and distribution system 1 is 17%-20%；
(2) mixed gas containing ammonia are prepared：
Ammoniacal liquor is stored and the ammoniacal liquor of distribution system 1 is passed through ammoniacal liquor evaporator tank 23, the ammoniacal liquor consumption is 220kg/h, ammonia
Water pressure is 0.55Mpa, and temperature is 20 DEG C.
Boiler secondary air 6 is delivered to injector 21 through booster fan to spray to ammoniacal liquor evaporator tank 23, fans entrance two
Secondary wind parameter is：Flow 1540Nm3/h, fans entrance pressure 3000Pa, temperature are 340 DEG C.Using above-mentioned parameter, be conducive to carrying
Height prepares the production efficiency of ammonia.
Ammoniacal liquor is evaporated using boiler secondary air 6, the mixed gas containing ammonia are obtained.
(3) denitration reaction is carried out：
Through hole of the mixed gas containing ammonia through spraying the grid of ammonia grid 5 is sprayed into SCR reactors, the spray ammonia grid
A diameter of 5.5mm of the through hole of 5 grid, ammonia are more than 16m/s from the flow velocity that the through hole of spray ammonia grid 5 sprays, while will
The flue gas that coal water slurry boiler is produced is passed through in flue, and the mixed gas containing ammonia are mixed with flue gas, in the ammonia and flue gas
Nitric oxide production mol ratio is 0.98：1, after process through catalyst 42, catalyst be tungstic acid (WO3), each layer of catalysis
Agent porch flue gas flow rate relative deviation≤15%；At each layer of catalyst inlet, ammonia nitrogen is than distribution relative deviation≤5%；Each
Dump angle degree≤10 ° at layer catalyst inlet, catalyst aperture is 7.5mm, specific surface area is 465m2/m3, porosity be
76%th, denitration surface area is 9.5m2, catalyst amount is 35.6m3, 310 DEG C of the minimum continuous spray ammonia temperature of SCR device, highest connects
420 DEG C of continuous spray ammonia temperature, obtains nitrogen and water after catalytic reaction.
Experiment effect is detected：
Table 1
The flue gas denitrification system for coal water slurry boiler described in the utility model be can be seen that according to the data in table 1
And the method for denitrating flue gas has the advantages that denitration effect is high.
Technical scheme described in the utility model was also once taken off by inventor in Qingdao Hou Hai 1,2# coal water slurry boiler flue gases
Verified in nitre engineering, as a result shown, the discharged nitrous oxides of Qingdao Hou Hai 1,2# coal water slurry boiler Flue Gas Denitrification Engineering are dense
Degree is minimum discharge (less than 50mg/Nm3), while the engineering is also domestic first coal water slurry boiler realizes minimum discharge engineering.
Preferred embodiment of the present utility model is the foregoing is only, not in order to limit the utility model, all in this practicality
Within new spirit and principle, any modification, equivalent substitution and improvements that is made etc. should be included in guarantor of the present utility model
Within the scope of shield.
Claims (10)
1. a kind of flue gas denitrification system for coal water slurry boiler, it is characterised in that including SCR reactor assemblies (3), described
SCR reactor assemblies (3) include SCR reactors (4) and spray ammonia grid (5)；
The gas approach of the exhaust gases passes (41) of SCR reactors (4) is connected with the exhanst gas outlet of coal water slurry boiler；Spray ammonia grid
The ammonia entrance of lattice (5) is used for being passed through ammonia or the mixed gas containing ammonia, and the ammonia outlet for spraying ammonia grid (5) is located at SCR
In the exhaust gases passes (41) of reactor (4), between spray ammonia grid (5) and the outlet of the exhaust gases passes (41) of SCR reactors (4)
Catalyst (42) is provided with, ammonia or the mixed gas containing ammonia enter to flue gas from the ammonia entrance of spray ammonia grid (5) and lead to
Nitrogen oxides in the flue gas that road (41) is produced with coal water slurry boiler afterwards generates nitrogen through catalyst reaction after mixing.
2. a kind of flue gas denitrification system for coal water slurry boiler according to claim 1, it is characterised in that the spray ammonia grid
Lattice (5) include main line (51) and branch pipeline (52), and one end of main line (51) is ammonia entrance, the other end of main line (51)
It is connected with one end of branch pipeline (52), branch pipeline (52) are provided with multiple and are connected with the other end of main line respectively, each
The other end of branch pipeline (52) is provided with multiple grids (521), and grid (521) is distributed with hole, and described grid (521) are logical positioned at flue gas
In road (41), for ammonia or mixed gas containing ammonia are passed through in exhaust gases passes (41).
3. a kind of flue gas denitrification system for coal water slurry boiler according to claim 1, it is characterised in that the catalyst
(42) any one in titanium dioxide, vanadic anhydride, tungstic acid is selected from.
4. a kind of flue gas denitrification system for coal water slurry boiler according to claim 1, it is characterised in that near flue gas
One section of passage of the exhanst gas outlet of passage (41) is vertically arranged, and catalyst (42) are provided with three layers, and three layers of catalyst are vertical
Direction is setting up and down, and wherein two-layer catalyst is fixedly installed with exhaust gases passes, and in addition one layer of catalyst is removably arranged on cigarette
In gas passage.
5. a kind of flue gas denitrification system for coal water slurry boiler according to claim 4, it is characterised in that the SCR is anti-
Device (4) is answered to be also equipped with flue gas disturbing flow device (43), reactor inlet temperature measurement apparatus (44), reactor differential pressure measuring installation
(45), reactor leaving water temperature measurement apparatus (46), reactor outlet ammonia escape detection means (47), reactor outlet nitrogen oxygen
Compound test equipment (48), high-level alarming device and acoustic wave ash ejector；
Described flue gas disturbing flow device (43) installed in catalyst (42) top, ammonia mix with flue gas after gas through flue gas flow-disturbing
It is catalyzed through catalyst (42) after device (43) again；
Reactor inlet temperature measurement apparatus (44) are arranged on the porch of exhaust gases passes；
Reactor differential pressure measuring installation (45) is arranged on catalyst (42) place, for detecting the difference at the top and bottom of catalyst
Pressure；
Reactor leaving water temperature measurement apparatus (46), reactor outlet ammonia escape detection means (47), high-level alarming device and
Reactor outlet oxynitrides testing equipment (48) is arranged on the exit of exhaust gases passes；
The acoustic wave ash ejector is arranged on the top of catalyst (42).
6. a kind of flue gas denitrification system for coal water slurry boiler according to any one of claim 1-5, it is characterised in that also
Including ammoniacal liquor vapo(u)rization system (2), described ammoniacal liquor vapo(u)rization system (2) are used for preparing ammonia or the mixed gas containing ammonia；Described
The ammonia outlet of ammoniacal liquor vapo(u)rization system is connected with the ammonia entrance of the spray ammonia grid of SCR reactors.
7. a kind of flue gas denitrification system for coal water slurry boiler according to claim 6, it is characterised in that the ammoniacal liquor steams
Sending out system (2) includes：Ammoniacal liquor evaporator tank (23), injector (21) and booster fan (22), the top of ammoniacal liquor evaporator tank (23)
Portion is provided with ammonia outlet, and the bottom of ammoniacal liquor evaporator tank (23) is provided with air inlet, and described injector (21) are steamed installed in ammoniacal liquor
Send out the middle part of groove (23)；
Coal water slurry boiler Secondary Air (6) is entered in ammoniacal liquor evaporator tank (23) from air inlet by booster fan (22), is pressurized wind
Machine (22) is used for evaporating ammoniacal liquor to form the mixed gas containing ammonia；
During ammoniacal liquor is sprayed to ammoniacal liquor evaporator tank (23) through injector (21), after mixing with booster fan (22) wind that comes of conveying,
The mixed gas containing ammonia are produced, the mixed gas containing ammonia are passed through spray ammonia grid by the ammonia outlet of ammoniacal liquor evaporator tank (23)
In lattice (5).
8. a kind of flue gas denitrification system for coal water slurry boiler according to claim 7, it is characterised in that the ammoniacal liquor steams
Sending out system (2) also includes cooling circuit, and the cooling circuit is used for increasing blower fan (22) cooling.
9. a kind of flue gas denitrification system for coal water slurry boiler according to claim 6, it is characterised in that also include ammoniacal liquor
Storage and distribution system (1), the ammoniacal liquor storage and the ammoniacal liquor outlet of distribution system (1) and the ammoniacal liquor of ammoniacal liquor vapo(u)rization system (2)
Entrance connects.
10. a kind of flue gas denitrification system for coal water slurry boiler according to claim 9, it is characterised in that the ammoniacal liquor
Storage and distribution system (1) include：Tank used for storing ammonia (11) and ammoniacal liquor conveying device (12), the ammonia being stored in tank used for storing ammonia (11)
Water is delivered to ammoniacal liquor vapo(u)rization system (2) by ammoniacal liquor conveying device (12), and unnecessary ammoniacal liquor is back in tank used for storing ammonia (11)
Row is recycled.
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| CN106310933A (en) * | 2016-08-24 | 2017-01-11 | 中科科林（辽宁）能源环保有限公司 | Flue gas denitration system for coal water slurry boiler and method for denitrating flue gas |
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| CN106310933A (en) * | 2016-08-24 | 2017-01-11 | 中科科林（辽宁）能源环保有限公司 | Flue gas denitration system for coal water slurry boiler and method for denitrating flue gas |
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Address after: Huanggu District of Shenyang City, 110000 East Road, located in Liaoning province No. 34 building 509 room 5 Patentee after: ZHONGKE KELIN ENERGY SAVING AND ENVIRONMENTAL TECHNOLOGY CO.,LTD. Address before: Huanggu District of Shenyang City, 110000 East Road, located in Liaoning province No. 34 building 509 room 5 Patentee before: ZHONGKEKELIN (LIAONING) ENERGY ENVIRONMENTAL PROTECTION CO.,LTD. |
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Assignee: SHENYANG DONGDIAN POWER EQUIPMENT DEVELOPMENT Co.,Ltd. Assignor: ZHONGKE KELIN ENERGY SAVING AND ENVIRONMENTAL TECHNOLOGY CO.,LTD. Contract record no.: X2023210000089 Denomination of utility model: A flue gas denitrification system for coal water slurry boilers Granted publication date: 20170315 License type: Common License Record date: 20230906 |
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