CN105521706B - The low ash-laden gas SCR denitration device of thermal power plant, method of denitration - Google Patents
The low ash-laden gas SCR denitration device of thermal power plant, method of denitration Download PDFInfo
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- CN105521706B CN105521706B CN201610065362.8A CN201610065362A CN105521706B CN 105521706 B CN105521706 B CN 105521706B CN 201610065362 A CN201610065362 A CN 201610065362A CN 105521706 B CN105521706 B CN 105521706B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
- B01D53/565—Nitrogen oxides by treating the gases with solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- General Chemical & Material Sciences (AREA)
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- Chimneys And Flues (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The low ash-laden gas SCR denitration device of thermal power plant of the present invention, method of denitration are related to a kind of device and method of the catalysis process purification waste gas using injection reactant.The low ash-laden gas SCR denitration device of thermal power plant of the present invention includes flue gas vapors heater, air vapor heater, steam drainage system, hot-blast stove, SCR reactors, flue gas heat-exchange unit, ammoniacal liquor storage and supply system, ammoniacal liquor evaporator etc. and related auxiliary equipment.For the method for denitration of the present invention by the said equipment processing come the boiler smoke after Self-duster, flue gas heating by the way of flue gas vapors heater and swinging flue gas heat-exchange unit are combined, has reached the energy-saving purpose with reducing operating cost using high temperature hot-blast furnace.
Description
Technical field
The present invention relates to the conventional method of purification waste gas and it is the specially designed device of this kind of method, particularly relates to
And the device and method of the catalysis process purification waste gas using injection reactant.
Background technology
In numerous gas denitrifying technologies, SCR (SCR) technology is current large thermal power plant denitrating flue gas
A kind of technology being most widely used.The denitration efficiency of SCR gas denitrifying technologies reaches as high as more than 90%, is that maturation can the most
The denitration technology leaned on.Its principle is the reducing agent NH in the presence of catalyst3Preference with the NO in flue gasXReaction,
By the NO in flue gasXNitrogen and water are reduced to, the effecting reaction temperature range of its catalyst must be between 300 DEG C~400 DEG C.For
Meet the suitable reaction temperature of SCR catalyst, SCR reactors are all arranged at boiler economizer outlet and air preheater at present
Between entrance, simultaneously as SCR reactors are in before the deduster equipment in flue gas flow, therefore the dust content of flue gas
It is very high, typically in 20-50g/m3Between, cause the abrasion of SCR flues and equipment also very serious.
In addition, for some built units without reserved denitration space between economizer and air preheater (particularly
Old unit), when needing higher denitration efficiency, how to carry out SCR denitration is a problem for being worth research, if denitration device
(SCR reactors) is arranged in after deduster, although denitration facility space-consuming can be solved the problems, such as flexibly, is produced in addition
The problem of flue-gas temperature can not meet the efficient catalytic reaction temperature section of high temperature catalyst, it can not realize that target denitration is imitated
Rate, reason are as follows：
(1) flue gas after deduster has been subjected to the cooling of boiler air preheater, flue-gas temperature section typically 110 DEG C~
Between 180 DEG C, far below the normal catalytic reaction temperature section of high temperature catalyst, therefore it can not use ripe, inexpensive, reliable
High temperature catalyst improves denitration efficiency；
(2) relatively low smoke reaction temperature is met using so-called low temperature catalyst (catalytic reaction temperature is below 200 DEG C)
Degree requires that, because reaction temperature is low, catalyst activity is relatively low, it is necessary to increases caltalyst accumulated amount to ensure high denitration effect
Rate, in porch NOXUnder concentration identical design condition, using low temperature catalyst, its volume can be increased to relative to high-temperature catalytic
2~3 times of agent, this results in equipment volume, catalyst cost etc. and is substantially increased.In addition, when flue-gas temperature is less than 200 DEG C, cigarette
Superfluous NH in gas3(being sprayed into needed for denitration) and SO3The reaction generation ammonium salt such as ammonium hydrogen sulfate, ammonium salt produce deposition easily block and
Corrode catalyst and equipment, great potential safety hazard is brought to system operation.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of low ash-laden gas SCR denitration device of thermal power plant, you can arrangement
After unit deduster and the denitrification apparatus of high temperature catalyst can be used, to be adapted between economizer and air preheater
Built unit or boiler without denitration space, guarantee safe production.
The low ash-laden gas SCR denitration device of thermal power plant of the present invention, flue includes former flue gases duct, neat stress flue, described
Former flue gases duct arrival end is provided with flue gas vapors heater, and the port of export is provided with SCR reactors, in addition to inside is divided into original
The flue gas heat-exchange unit of flue gas chamber, neat stress chamber, the former flue gas chamber, neat stress chamber respectively with former flue gases duct, neat stress flue
Connection, the SCR reactors connect with neat stress flue, and the former flue gases duct connects with hot-blast stove, and the flue gas vapors add
Hot device connects with steam drainage system, air vapor heater, and described air vapor heater one end connects dilution air, another
End connects ammoniacal liquor evaporator, and ammoniacal liquor storage and supply system are connected with the ammoniacal liquor evaporator, is set in the former flue gases duct
The vortex mixer for spraying and mixing for ammonia is equipped with, the ammoniacal liquor evaporator connects with vortex mixer.
The low ash-laden gas SCR denitration device of thermal power plant of the present invention, wherein being connected with temperature adjustment blower fan on the hot-blast stove.
The low ash-laden gas SCR denitration device of thermal power plant of the present invention, wherein ammoniacal liquor storage includes ammoniacal liquor with supply system
Storage tank, ammoniacal liquor supply pump, adjustment mechanism for valve, the ammoniacal liquor supply pump and adjustment mechanism for valve are installed in tank used for storing ammonia and ammoniacal liquor
Between evaporator.
The low ash-laden gas SCR denitration device of thermal power plant of the present invention, wherein being provided with atomization at the ammoniacal liquor evaporator inlet
Nozzle, the nozzle threads are connected to porch and are configured with dismountable flange.
The low ash-laden gas SCR denitration device of thermal power plant of the present invention, wherein the steam drainage system includes flash tank, exhaust
Valve, hydrophobic valve, low-pressure steam pipe network and condensate pipe network are connected with the flash tank.
Present invention also offers a kind of method of denitration using said apparatus, comprise the following steps：
A checks ammoniacal liquor storage and supply system, ammoniacal liquor evaporator, external vapour system, condensate pipe network, flue gas heat exchange
Device, flue gas vapors heater, air vapor heater, hot-blast stove simultaneously make the said equipment possess logical plume part；
B starts flue gas heat-exchange unit；
C flue gas heat-exchange units running a period of time after start the vapour system, condensate pipe network, flue gas vapors heater,
Air vapor heater, hot-blast stove and logical flue gas；
D starts dilution air, keeps the spray ammonia system pipeline on ammoniacal liquor evaporator unimpeded；
E is the flue gas vapors heater, air vapor heater is passed through incoming steam and opens flash tank, keeps steam
Draining system is unimpeded；
F is passed through the incoming steam of flue gas vapors heater, air vapor heater by adjusting steam inlet valve regulated
Flow, progressively make to be passed through cigarette temperature rise at SCR reactor inlets to 150-190 DEG C from former flue gases duct；
G starts hot-blast stove, and adjusts temperature by temperature adjustment blower fan, the cigarette temperature at SCR reactor inlets is reached 190-260
℃；
H continues to increase the flue-gas temperature in hot-blast stove exit, until the cigarette temperature at SCR reactor inlets reaches setting value
300-320℃；
I starts ammoniacal liquor supply pump, keeps ammoniacal liquor storage unimpeded with supply system；
J starts ammoniacal liquor evaporator；
K ammoniacal liquor evaporator is by spraying ammonia system pipeline by ammonia storage with being supplied to vortex mixer, to former flue gases duct
Interior flue gas carries out denitration, while according to parameters such as denitration efficiency, the escaping of ammonia rates, ammonia aqua stream is controlled by adjustment mechanism for valve
Amount；
L completes denitration.
The denitrating technique flow of the application is as follows：
Carry out the low temperature after Self-duster, low ash-laden gas enters cigarette after flue gas vapors heater is heated to certain temperature
Gas heat exchanger (denitration GGH systems) former flue gases duct continues to heat up, and then the high-temperature flue gas again with hot blast stove system outlet mixes
It is continuously heating to high temperature catalyst reactivity temperature.The fuel of hot-blast stove can use diesel oil, natural gas etc..Due to hot-blast stove
Need to consume certain fuel, therefore, to save fuel, system heats up using following three-level heating system to flue gas：
(1) low-temperature flue gas is heated to 150 DEG C -190 DEG C or so by flue gas heat-exchange unit using process steams；
(2) by flue gas heat-exchange unit, the heat that about 320 DEG C of flue gas is exported using SCR reactors (Benitration reactor) will
Low-temperature flue gas is further heated up to about 290 DEG C；
(3) finally, this partial fume is mixed and heated to about 320 DEG C with the high-temperature flue gas of hot blast outlet of still again, to adapt to height
The catalytic reaction temperature of warm catalyst, reacted hence into SCR reactors.
The fuel of hot-blast stove by with after air mixed combustion, cigarette temperature reaches about 1500 DEG C, cooling wind need to be used by high temperature cigarette
Gas is adjusted to about 850 DEG C -900 DEG C, then enters back into the flue gas that flue continues heating boiler, is directly joined using flue gas herein mixed
Main purpose is heat convection.About 150 DEG C -190 DEG C of heat smoke after being heated during denitration of the present invention using above-mentioned one-level
As cooling wind regime, former flue gas is delivered to by hearth of hot-blast stove afterbody using frequency conversion fan, it is mixed by joining with hot-blast stove high-temperature flue gas
After deliver to former flue gases duct, do not use surrounding air to do cooling wind regime and reduce further cold blast rate into flue gas system, rise
The effect of energy-conservation is arrived.
In addition, the former flue gas cigarette that the mixed gas of the ammonia/air prepared by ammoniacal liquor evaporator enters before SCR reactors
Road, enter after vortex mixing system is sufficiently mixed with the heat smoke after heating and denitrating flue gas processing is carried out in SCR reactors.Through
The flue gas crossed after denitration process enters neat stress flue, passes through the flue gas heat exchange of flue gas heat-exchange unit and former flue gases duct cooling heel row
Go out, reached the energy-saving purpose with reducing operating cost using flue gas heat-exchange unit (denitration GGH systems).
In summary, denitrification apparatus of the invention and the method for denitration using the device, solve denitration facility and take up an area chi
Very little big, the problem of difficult, is installed in transformation additional, while still ripe, inexpensive, reliable high temperature catalyst can be used to improve denitration efficiency.
Because the flue gas after deduster has been that (dust contained flue gas concentration is in 20~100mg/m for low ash-laden gas3Between), so as to solve cigarette
Road, catalyst, the wear problem of denitration device so that the life-span of denitration device and catalyst is greatly prolonged, and is improved
The performance driving economy of overall denitration facility.Further, since denitrification apparatus be not required to again to the back-end ductwork of original boiler, economizer and
Steelframe is transformed, and saves substantial amounts of boiler body retrofit work, construction investment is greatly reduced.Moreover, low dust-laden denitration dress
Put due to not interfering with boiler improvement, thus the influence in terms of burning with efficiency will not be also brought to boiler, greatly meet
Energy-saving and environmental protection and the demands of safety in production.
The low ash-laden gas SCR denitration device of thermal power plant to the present invention, method of denitration are made furtherly below in conjunction with the accompanying drawings
It is bright.
Brief description of the drawings
Fig. 1 is the structural representation of the low ash-laden gas SCR denitration device of thermal power plant of the present invention.
Embodiment
As shown in figure 1, flue includes former flue gases duct 3, neat stress flue 31, the former arrival end of flue gases duct 3 is provided with cigarette
Gas steam heater 2, the flue gas 1 after unit deduster are passed through flue gas vapors heater 2 from the arrival end.Former flue gases duct 3 goes out
Mouth end is provided with SCR reactors 14, and SCR reactors 14 connect with neat stress flue 31, the flue gas after the processing of SCR reactors 14
Discharged through neat stress flue 31, the discharge interface 15 that can be set according to the actual requirements with user herein is connected.The application's is de-
Nitre device also includes inside and is divided into former flue gas chamber 41, the flue gas heat-exchange unit 4 of neat stress chamber 42, former flue gas chamber 41, neat stress chamber
42 connect with former flue gases duct 3, neat stress flue 31 respectively.Former flue gases duct 3 connects with hot-blast stove 5.Heated for ease of regulation
Temperature, the flue gas of sufficient temp is obtained, temperature adjustment blower fan 6 is connected with hot-blast stove 5.
Flue gas vapors heater 2 also connects with steam drainage system, air vapor heater 8.Flue gas vapors heater 2 with
Air vapor heater 8 is principle identical equipment, is to heat flue gas or air using steam.Steam drainage system includes dodging
Steaming pot 17, drain tap, hydrophobic valve, low-pressure steam pipe network 18 and condensate pipe network 19 are connected with flash tank 17, power plant
Low-pressure steam pipe network 18 is used for the gas for reclaiming the discharge of flash tank 17, and condensate pipe network 19 arranges condensate caused by flash tank 17
To power plant condensation water system, condensate is reclaimed.
The one end of air vapor heater 8 connects dilution air 7, other end connection ammoniacal liquor evaporator 9, on ammoniacal liquor evaporator 9
Ammoniacal liquor storage and supply system are connected with, the vortex mixer 13 for spraying and mixing for ammonia is provided with former flue gases duct 3,
Ammoniacal liquor evaporator 9 connects with vortex mixer 13.Ammoniacal liquor store with supply system include tank used for storing ammonia 11, ammoniacal liquor supply pump 10,
Adjustment mechanism for valve 12, ammoniacal liquor supply pump 10 and adjustment mechanism for valve 12 are installed between tank used for storing ammonia 11 and ammoniacal liquor evaporator 9.
Reducing agent ammonia used in method of denitration of the present invention is to evaporate ammoniacal liquor by ammoniacal liquor evaporator 9 to obtain.First, normal temperature
Under air be sent into air vapor heater 8 through dilution air 7 and heat, subsequently enter ammoniacal liquor evaporator 9.Meanwhile stored up from ammoniacal liquor
Deposit and be injected into ammoniacal liquor evaporator 9 through atomizer with the ammoniacal liquor that supply system is come and steamed rapidly under the effect of high temperature dilution wind
Hair, discharges ammonia.Atomizer is arranged at the ammonia inlet of ammoniacal liquor evaporator 9, and its main function is atomized ammonia, is easy to
Ammoniacal liquor fast vaporizing evaporates, and prevents the ammonia emission pipeline that ammoniacal liquor does not evaporate and enters ammoniacal liquor evaporator 9 in time from causing to waste.For
Dismounting is easily installed, saves the operating time, atomizer is using threaded connection and configures dismountable flange.Water after evaporation steams
The mixed gas of vapour, ammonia and hot-air exports the vortex mixer 13 entered in former flue gases duct 3 from ammoniacal liquor evaporator 9.
The low ash-laden gas SCR denitration method of thermal power plant comprises the following steps：
A checks ammoniacal liquor storage and supply system, ammoniacal liquor evaporator 9, external vapour system, condensate pipe network 19, flue gas
Heat exchanger 4, flue gas vapors heater 2, air vapor heater 8, hot-blast stove 5 simultaneously make the said equipment possess logical plume part；
B starts flue gas heat-exchange unit 4；
C flue gas heat-exchange units 4 operate a period of time after start vapour system, condensate pipe network 19, flue gas vapors heater 2,
Air vapor heater 8, hot-blast stove 5 and logical flue gas；
D starts dilution air 7, keeps the spray ammonia system pipeline on ammoniacal liquor evaporator 9 unimpeded；
E is flue gas vapors heater 2, air vapor heater 8 is passed through incoming steam 16 and opens flash tank 17, keeps steaming
Vapour draining system is unimpeded；
F is passed through flue gas vapors heater 2 by adjusting steam inlet valve regulated, the incoming of air vapor heater 8 is steamed
The flow of vapour 16, progressively make to be passed through the cigarette temperature rise of the porch of SCR reactors 14 to 150-190 DEG C from former flue gases duct 3；
G starts hot-blast stove 5, and adjusts temperature by temperature adjustment blower fan 6, reaches the cigarette temperature of the porch of SCR reactors 14
190-260℃；
H continues to increase the flue-gas temperature in the exit of hot-blast stove 5, until the cigarette temperature of the porch of SCR reactors 14 reaches setting
300-320 DEG C of value；
I starts ammoniacal liquor supply pump 10, keeps ammoniacal liquor storage unimpeded with supply system；
J starts ammoniacal liquor evaporator 9；
K ammoniacal liquor evaporator 9 is by spraying ammonia system pipeline by ammonia storage with being supplied to vortex mixer 13, to former flue gas cigarette
Flue gas in road 3 carries out denitration, while according to parameters such as denitration efficiency, the escaping of ammonia rates, ammonia is controlled by adjustment mechanism for valve 12
Water-carrying capacity；
L completes denitration.
In above-mentioned method of denitration, denitration efficiency and the escaping of ammonia rate are whole denitrating system performance assessment criteria, for example, denitration efficiency
80%, the escaping of ammonia rate 3ppm.
With the data under two units, a unit operating mode, the present invention will be described separately below.
(BMCR (Boiler maximum continuous rating) under two B of Unit MCR operating modes：Boiler most Dalian
Continuous evaporation capacity, the mainly EIAJ in the case where meeting steam parameter, burner hearth security situation)：
Under 1 B of Unit MCR operating mode：
Under 1 unit 50%BMCR operating mode：
From above-mentioned data, the present apparatus can the change of flexible adaptation unit load, realize that full working scope denitrating flue gas is handled,
It can avoid, because unit load changes, causing flue gas cigarette temperature to change, so as to influence denitrating flue gas processing, more embody device
Superiority.
In summary, denitrification apparatus of the invention and the denitration method for flue gas using the device at least have beneficial effect below
Fruit：
(1) heater and heating medium can be flexibly set in denitrification apparatus of the invention, the later stage can also be coordinated
Flue gas desulfurization technique designs, and by three-level heating system, reduces the fuel consumption of hot-blast stove 5 to greatest extent, and make full use of
The steam waste heat of power plant and internal system waste heat, reach energy-saving purpose；
(2) this method of denitration has the feature that need not transform boiler body and its back-end ductwork, can be used as and save coal
The more excellent process choice of old unit without denitration space between device and air preheater；
(3) it is a kind of ammonia mode processed with higher-security using ammoniacal liquor ammonia, has for Pump for Medium and Small Power Generating Set excellent
Security and economy；
(4) substantial amounts of boiler body retrofit work is saved, significantly reduces construction investment, low dust-laden denitration after deduster
Device is not due to interfering with boiler improvement, so as to will not also bring the adverse effect in terms of burning with efficiency to boiler, thus
Greatly meet the demand of energy-saving and environmental protection and safety in production；
(5) denitrating catalyst and its wear problem of equipment are solved so that the life-span of denitration device and catalyst obtains
To greatly prolong, the performance driving economy of overall denitrification apparatus is improved.
(6) being significantly increased for the catalyst volume brought using low temperature catalyst and cost is avoided, and in low temperature feelings
The potential safety hazard of deposition, blocking and corrosion that the ammonium salts such as ammonium hydrogen sulfate are brought to system is generated under condition；
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
Enclose and be defined, on the premise of design spirit of the present invention is not departed from, technical side of the those of ordinary skill in the art to the present invention
The various modifications and improvement that case is made, it all should fall into the protection domain of claims of the present invention determination.
Claims (6)
1. the low ash-laden gas SCR denitration device of thermal power plant, it is characterised in that：Flue includes former flue gases duct (3), neat stress flue
(31), former flue gases duct (3) arrival end is provided with flue gas vapors heater (2), and the port of export is provided with SCR reactors
(14), in addition to inside is divided into former flue gas chamber (41), the flue gas heat-exchange unit (4) of neat stress chamber (42), the former flue gas chamber
(41), neat stress chamber (42) connects with former flue gases duct (3), neat stress flue (31) respectively, the SCR reactors (14) with it is net
Flue gases duct (31) connects, and the former flue gases duct (3) connects with hot-blast stove (5), the flue gas vapors heater (2) and steam
Draining system, air vapor heater (8) connection, air vapor heater (8) one end connection dilution air (7) are another
End connects ammoniacal liquor evaporator (9), and ammoniacal liquor storage and supply system, the former flue gas cigarette are connected with the ammoniacal liquor evaporator (9)
The vortex mixer (13) for spraying and mixing for ammonia, the ammoniacal liquor evaporator (9) and vortex mixer are provided with road (3)
(13) connect, it is laggard that the low temperature that comes after Self-duster, low ash-laden gas by flue gas vapors heater (2) are heated to certain temperature
Enter flue gas heat-exchange unit (4), then mixed again with the high-temperature flue gas of hot-blast stove (5) outlet and be continuously heating to high temperature catalyst reaction work
Warm-natured degree.
2. the low ash-laden gas SCR denitration device of thermal power plant according to claim 1, it is characterised in that：The hot-blast stove (5)
On be connected with temperature adjustment blower fan (6).
3. the low ash-laden gas SCR denitration device of thermal power plant according to claim 2, it is characterised in that：The ammoniacal liquor storage
Include tank used for storing ammonia (11), ammoniacal liquor supply pump (10), adjustment mechanism for valve (12), the ammoniacal liquor supply pump (10) with supply system
And adjustment mechanism for valve (12) is installed between tank used for storing ammonia (11) and ammoniacal liquor evaporator (9).
4. the low ash-laden gas SCR denitration device of thermal power plant according to claim 3, it is characterised in that：The ammoniacal liquor evaporation
Device (9) porch is provided with atomizer, and the nozzle threads are connected to porch and are configured with dismountable flange.
5. the low ash-laden gas SCR denitration device of thermal power plant according to claim 4, it is characterised in that：The steam drainage
System includes flash tank (17), drain tap, hydrophobic valve, be connected with the flash tank (17) low-pressure steam pipe network (18) and
Condensate pipe network (19).
6. utilize the method for denitration of the low ash-laden gas SCR denitration device of thermal power plant described in claim 5, it is characterised in that：Bag
Include following steps：
A checks ammoniacal liquor storage and supply system, ammoniacal liquor evaporator (9), external vapour system, condensate pipe network (19), flue gas
Heat exchanger (4), flue gas vapors heater (2), air vapor heater (8), hot-blast stove (5) simultaneously make the said equipment possess logical plume
Part；
B starts flue gas heat-exchange unit (4)；
C flue gas heat-exchange units (4) start the vapour system, condensate pipe network (19), flue gas vapors heating after running a period of time
Device (2), air vapor heater (8), hot-blast stove (5) and logical flue gas；
D starts dilution air (7), keeps the spray ammonia system pipeline on ammoniacal liquor evaporator (9) unimpeded；
E is the flue gas vapors heater (2), air vapor heater (8) is passed through incoming steam (16) and opens flash tank
(17), keep steam drainage system unimpeded；
F is passed through flue gas vapors heater (2) by adjusting steam inlet valve regulated, the incoming of air vapor heater (8) is steamed
Vapour (16) flow, progressively make to be passed through the cigarette temperature rise of SCR reactors (14) porch to 150-190 DEG C from former flue gases duct (3)；
G starts hot-blast stove (5), and adjusts temperature by temperature adjustment blower fan (6), reaches the cigarette temperature of SCR reactors (14) porch
190-260℃；
H continues to increase the flue-gas temperature in hot-blast stove (5) exit, until the cigarette temperature of SCR reactors (14) porch reaches setting
300-320 DEG C of value；
I starts ammoniacal liquor supply pump (10), keeps ammoniacal liquor storage unimpeded with supply system；
J starts ammoniacal liquor evaporator (9)；
K ammoniacal liquor evaporator (9) is by spraying ammonia system pipeline by ammonia storage with being supplied to vortex mixer (13), to former flue gas cigarette
Flue gas in road (3) carries out denitration, while according to denitration efficiency, the escaping of ammonia rate parameter, is controlled by adjustment mechanism for valve (12)
Ammoniacal liquor flow；
L completes denitration.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106076117B (en) * | 2016-07-11 | 2018-09-25 | 浙江浙能技术研究院有限公司 | A kind of fired power generating unit efficient low-load denitrification apparatus and control method |
| CN107120673A (en) * | 2017-05-11 | 2017-09-01 | 无锡华光新动力环保科技股份有限公司 | Low temperature SCR denitration and flue gas take off white device |
| CN108087903B (en) * | 2018-01-19 | 2023-08-22 | 云南丰普科技有限公司 | GGH heating system for preventing wet flue gas from corroding and blocking pipeline and use method |
| CN109589788B (en) * | 2018-12-05 | 2021-11-30 | 武汉奥杰科技股份有限公司 | Novel flue gas denitration system |
| CN110141961A (en) * | 2019-05-22 | 2019-08-20 | 上海电力学院 | A kind of coal-burning boiler full load SCR denitration system |
| CN110368811A (en) * | 2019-08-16 | 2019-10-25 | 北京首钢国际工程技术有限公司 | A kind of SCR denitration Smoke-heating device for wearing secondary mixed wind |
| CN111467962A (en) * | 2020-05-13 | 2020-07-31 | 鞍山华信重工机械有限公司 | Flue gas dedusting and denitration system device for magnesium refractory material industrial furnace |
| CN112304105A (en) * | 2020-11-23 | 2021-02-02 | 西安西热锅炉环保工程有限公司 | Cascade utilization system for flue gas waste heat of alkali furnace |
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| CN203899458U (en) * | 2014-05-29 | 2014-10-29 | 四川华创环保工程有限责任公司 | Novel flue gas SCR denitration device |
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