CN205517257U - Ash -laden gas SCR denitrification facility hangs down in thermal power plant - Google Patents
Ash -laden gas SCR denitrification facility hangs down in thermal power plant Download PDFInfo
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- CN205517257U CN205517257U CN201620095239.6U CN201620095239U CN205517257U CN 205517257 U CN205517257 U CN 205517257U CN 201620095239 U CN201620095239 U CN 201620095239U CN 205517257 U CN205517257 U CN 205517257U
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- gas
- flue gas
- ammoniacal liquor
- power plant
- thermal power
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model discloses ash -laden gas SCR denitrification facility hangs down in thermal power plant relates to a catalysis method clean the exhaust gas's who adopts to pour into the reactant into device. The utility model discloses ash -laden gas SCR denitrification facility hangs down in thermal power plant includes flue gas steam heater, air steam heater, steam drainage system, hot -blast furnace, SCR reactor, gas gas heater, aqueous ammonia storage and supply system, ammonia water evaporator etc. And relevant auxiliary assembly. Handle through above -mentioned device and come from the boiler flue gas behind the dust remover, the flue gas heaies up and adopts high temperature hot air stove and the mode that flue gas steam heater and rotation gas gas heater combined together, the purpose that has reached energy saving and consumption reduction and reduced the running cost.
Description
Technical field
The utility model relates to the conventional method of purification waste gas and is the specially designed equipment of this kind of method or device, particularly relates to
The catalysis process injecting reactant is used to purify the device of waste gas.
Background technology
In numerous gas denitrifying technologies, SCR (SCR) technology is the application of current large thermal power plant denitrating flue gas
Most commonly used a kind of technology.The denitration efficiency of SCR gas denitrifying technology reaches as high as more than 90%, is mature and reliable the most
Denitration technology.Its principle is under the effect of catalyst, reducing agent NH3Preference with the NO in flue gasXReaction, will
NO in flue gasXBeing reduced to nitrogen and water, the effecting reaction temperature range of its catalyst must be between 300 DEG C～400 DEG C.In order to
Meeting the reaction temperature that SCR catalyst is suitable, current SCR reactor is all arranged at boiler economizer outlet and air preheater
Between entrance, simultaneously as before the deduster equipment that is in flue gas flow of SCR reactor, the therefore dust content of flue gas
The highest, typically at 20-50g/m3Between, the abrasion causing SCR flue and equipment is the most serious.
It addition, for some built units (the oldest unit) without reserved denitration space between economizer and air preheater,
When the higher denitration efficiency of needs, how carrying out SCR denitration is a problem being worth research, if (SCR is anti-for denitration device
Answer device) be arranged in deduster after, although the problem that denitration facility takes up room can be solved flexibly, but additionally create flue gas
The problem that temperature can not meet the efficient catalytic reaction temperature interval of high temperature catalyst, it is impossible to realizing target denitration efficiency, reason is such as
Under:
(1) flue gas after deduster is through the cooling of boiler air preheater, and flue-gas temperature is interval general at 110 DEG C～180 DEG C
Between, interval far below the normal catalytic reaction temperature of high temperature catalyst, therefore cannot use maturation, high temperature inexpensive, reliable
Catalyst improves denitration efficiency；
(2) use so-called low temperature catalyst (catalytic reaction temperature is below 200 DEG C) to meet relatively low smoke reaction temperature to want
Asking, owing to reaction temperature is low, catalyst activity is the most relatively low, it is necessary to increases caltalyst accumulated amount and ensures high denitration efficiency,
At porch NOXUnder the design condition that concentration is identical, use its volume of low temperature catalyst can increase to relative to high temperature catalyst
2～3 times, this results in equipment volume, catalyst cost etc. and is substantially increased.During additionally, flue-gas temperature is less than 200 DEG C, in flue gas
Superfluous NH3(spraying into needed for denitration) and SO3The ammonium salts such as reaction generation ammonium hydrogen sulfate, ammonium salt produces deposition easily blocking and corruption
Erosion catalyst and equipment, run to system and bring great potential safety hazard.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of thermal power plant low ash-laden gas SCR denitration device, i.e. may be arranged at
After unit deduster and the denitrification apparatus of high temperature catalyst can be used, to be adapted between economizer and air preheater without de-
The built unit in nitre space or boiler, guarantee safe production.
The utility model thermal power plant low ash-laden gas SCR denitration device, 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 reactor, also includes that inside is divided into former
Flue gas chamber, the flue gas heat-exchange unit in neat stress chamber, described former flue gas chamber, neat stress chamber respectively with former flue gases duct, neat stress flue
Connection, described SCR reactor connects with neat stress flue, and described former flue gases duct connects with hot-blast stove, and described flue gas vapors adds
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 evaporimeter, described ammoniacal liquor evaporimeter connects and has ammoniacal liquor to store and supply system, arrange in described former flue gases duct
Having for ammonia injection and the vortex mixer of mixing, described ammoniacal liquor evaporimeter connects with vortex mixer.
The utility model thermal power plant low ash-laden gas SCR denitration device, wherein said hot-blast stove connects and has temperature adjustment blower fan.
The utility model thermal power plant low ash-laden gas SCR denitration device, wherein said ammoniacal liquor stores and includes that ammoniacal liquor stores up with supply system
Tank, ammoniacal liquor supply pump, adjustment mechanism for valve, described ammoniacal liquor supply pump and adjustment mechanism for valve are installed in tank used for storing ammonia and steam with ammoniacal liquor
Send out between device.
The utility model thermal power plant low ash-laden gas SCR denitration device, is provided with atomization spray at wherein said ammoniacal liquor evaporator inlet
Mouth, described nozzle threads is connected to porch and is configured with dismountable flange.
The utility model thermal power plant low ash-laden gas SCR denitration device, wherein said steam drainage system includes flash tank, exhaust
Valve, hydrophobic valve, described flash tank connects and has low-pressure steam pipe network and condensate pipe net.
The denitrating technique flow process of the application is as follows:
Come the low temperature after Self-duster, low ash-laden gas after flue gas vapors heater is heated to uniform temperature, enters flue gas heat exchange
Device (denitration GGH system) former flue gases duct continues to heat up, and the high-temperature flue gas with hot blast stove system outlet mixes continuation liter the most again
Temperature is to high temperature catalyst reaction active temperature.The fuel of hot-blast stove can use diesel oil, natural gas etc..Owing to hot-blast stove needs to disappear
Consuming certain fuel, therefore, for saving fuel, flue gas is heated up and uses following three grades of heating systems by system:
(1) utilize process steams, by flue gas heat-exchange unit, low-temperature flue gas is heated to 150 DEG C about-190 DEG C；
(2) by flue gas heat-exchange unit, utilize the heat of flue gas of SCR reactor (Benitration reactor) outlet about 320 DEG C by low
Temperature flue gas further heats up to about 290 DEG C；
(3) last, this partial fume high-temperature flue gas with hot-blast stove outlet again is mixed and heated to about 320 DEG C, urges adapting to high temperature
The catalytic reaction temperature of agent, reacts hence into SCR reactor.
The fuel of hot-blast stove by with air mixed combustion after, cigarette temperature reaches about 1500 DEG C, need to cooling wind by high-temperature flue gas adjust
To about 850 DEG C-900 DEG C, then enter back into flue and continue the flue gas of heating boiler, use flue gas directly to join mixed main mesh herein
Be heat convection.The heat smoke conduct of about 150 DEG C-190 DEG C after the heating of above-mentioned one-level is used during the utility model denitration
Cooling wind regime, uses frequency conversion fan that former flue gas is delivered to hearth of hot-blast stove afterbody, delivers to after mixed with hot-blast stove high-temperature flue gas ginseng
Former flue gases duct, does not use surrounding air to do cooling wind regime and reduce further the cold blast rate entering flue gas system, serve energy-conservation
Effect.
It addition, the mixed gas of the ammonia/air prepared by ammoniacal liquor evaporimeter enters the former flue gases duct before SCR reactor, warp
Heat smoke after eddy current hybrid system and intensification carries out denitrating flue gas process in entering SCR reactor after being sufficiently mixed.Through denitration
Flue gas after process enters neat stress flue, discharges, use after being lowered the temperature by the flue gas heat exchange of flue gas heat-exchange unit with former flue gases duct
Flue gas heat-exchange unit (denitration GGH system) has reached purpose that is energy-saving and cost-reducing and that reduce operating cost.
In sum, use denitrification apparatus of the present utility model to carry out denitration process, solve denitration facility and take up an area size greatly, change
Make the problem installing difficulty additional, maturation, high temperature catalyst inexpensive, reliable still can be used to improve denitration efficiency simultaneously.Owing to removing
Flue gas after dirt device has been that (dust contained flue gas concentration is 20～100mg/m for low ash-laden gas3Between), thus solve flue, urge
Agent, the wear problem of denitration device so that the life-span of denitration device and catalyst is greatly prolonged, improve overall de-
The performance driving economy of nitre facility.Further, since denitrification apparatus is not required to enter back-end ductwork, economizer and the steelframe of original boiler again
Row transformation, saves substantial amounts of boiler body retrofit work, construction investment is greatly reduced.And, low dust-laden denitrification apparatus due to
Do not interfere with boiler improvement, thus will not bring the impact in terms of burning and efficiency to boiler yet, greatly meet energy-conservation,
Environmental protection and the demand of safety in production.
Ash-laden gas SCR denitration device low to thermal power plant of the present utility model is described further below in conjunction with the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model thermal power plant low ash-laden gas SCR denitration device.
Detailed description of the invention
As it is shown in figure 1, flue includes that former flue gases duct 3, neat stress flue 31, former flue gases duct 3 arrival end are provided with flue gas
Steam heater 2, the flue gas 1 after unit deduster is passed through flue gas vapors heater 2 from this arrival end.Former flue gases duct 3 exports
End is provided with SCR reactor 14, and SCR reactor 14 connects with neat stress flue 31, after SCR reactor 14 processes
Flue gas discharge through neat stress flue 31, the discharge interface 15 that herein can arrange according to the actual requirements with user is connected.This Shen
Denitrification apparatus please also includes that inside is divided into the flue gas heat-exchange unit 4 in former flue gas chamber 41, neat stress chamber 42, former flue gas chamber 41,
Neat stress chamber 42 connects with former flue gases duct 3, neat stress flue 31 respectively.Former flue gases duct 3 connects with hot-blast stove 5.For
Being easy to regulate heating-up temperature, it is thus achieved that the flue gas of sufficient temp, hot-blast stove 5 connects temperature adjustment blower fan 6.
Flue gas vapors heater 2 also connects with steam drainage system, air vapor heater 8.Flue gas vapors heater 2 is with empty
Gas steam heater 8 is the equipment that principle is identical, is employing steam and adds heat smoke or air.Steam drainage system includes flash distillation
Tank 17, drain tap, hydrophobic valve, flash tank 17 connects and has low-pressure steam pipe network 18 and condensate pipe net 19, power plant
Low-pressure steam pipe network 18 is for reclaiming the gas that flash tank 17 is discharged, the condensation water that flash tank 17 is produced by condensate pipe net 19
Drain into power plant condensation water system, reclaim and condense water.
Air vapor heater 8 one end connects dilution air 7, and the other end connects ammoniacal liquor evaporimeter 9, and ammoniacal liquor evaporimeter 9 connects
There is ammoniacal liquor to store and supply system, be provided with in former flue gases duct 3 for ammonia injection and the vortex mixer 13 of mixing, ammoniacal liquor
Evaporimeter 9 connects with vortex mixer 13.Ammoniacal liquor stores and includes that tank used for storing ammonia 11, ammoniacal liquor supply pump 10, valve with supply system
Door adjusting means 12, ammoniacal liquor supply pump 10 and adjustment mechanism for valve 12 are installed between tank used for storing ammonia 11 and ammoniacal liquor evaporimeter 9.
Reducing agent ammonia used by the utility model denitrification apparatus evaporates ammoniacal liquor by ammoniacal liquor evaporimeter 9 and obtains.First, normal temperature
Under air send into air vapor heater 8 through dilution air 7 and heat, subsequently enter ammoniacal liquor evaporimeter 9.Meanwhile, from ammoniacal liquor
Store the ammoniacal liquor come with supply system be injected into ammoniacal liquor evaporimeter 9 through atomizer and evaporate rapidly under high temperature dilution wind effect,
Discharge ammonia.Atomizer is arranged at the ammonia inlet of ammoniacal liquor evaporimeter 9, and its Main Function is atomized ammonia, it is simple to ammonia
Water fast vaporizing evaporates, and prevents ammoniacal liquor from evaporating the most in time and enters the ammonia emission pipeline of ammoniacal liquor evaporimeter 9 and cause waste.For just
In installing/dismounting, saving the operating time, atomizer uses threaded and configures dismountable flange.Water vapour after evaporation,
The mixed gas of ammonia and hot-air enters the vortex mixer 13 in former flue gases duct 3 from ammoniacal liquor evaporimeter 9 outlet.
Thermal power plant's low ash-laden gas SCR denitration method comprises the steps:
A checks that ammoniacal liquor stores and changes with supply system, ammoniacal liquor evaporimeter 9, external vapour system, condensate pipe net 19, flue gas
Hot device 4, flue gas vapors heater 2, air vapor heater 8, hot-blast stove 5 also make the said equipment possess logical plume part；
B starts flue gas heat-exchange unit 4；
C flue gas heat-exchange unit 4 starts vapour system, condensate pipe net 19, flue gas vapors heater 2, sky after operating a period of time
Gas steam heater 8, hot-blast stove 5 logical flue gas；
D starts dilution air 7, keeps the spray ammonia system pipeline on ammoniacal liquor evaporimeter 9 unimpeded；
E is that flue gas vapors heater 2, air vapor heater 8 are passed through and flow steam 16 and open flash tank 17, keeps steam
Draining system is unimpeded；
F by regulation steam inlet valve regulated be passed through flue gas vapors heater 2, air vapor heater 8 flow steam 16
Flow, progressively makes to be passed through the cigarette temperature rise of SCR reactor 14 porch to 150-190 DEG C from former flue gases duct 3；
G starts hot-blast stove 5, and regulates temperature by temperature adjustment blower fan 6, makes the cigarette temperature of SCR reactor 14 porch reach
190-260℃；
H continues to strengthen the flue-gas temperature in hot-blast stove 5 exit, until the cigarette temperature of SCR reactor 14 porch reaches setting value
300-320℃；
I starts ammoniacal liquor supply pump 10, keeps ammoniacal liquor to store unimpeded with supply system；
J starts ammoniacal liquor evaporimeter 9；
Ammonia is stored with supply to vortex mixer 13 by K ammoniacal liquor evaporimeter 9 by spray ammonia system pipeline, to former flue gases duct 3
Interior flue gas carries out denitration, simultaneously according to the parameter such as denitration efficiency, the escaping of ammonia rate, controls ammonia aqua stream by adjustment mechanism for valve 12
Amount；
L completes denitration.
In above-mentioned method of denitration, denitration efficiency and the escaping of ammonia rate are whole denitrating system performance assessment criteria, such as, denitration efficiency 80%,
The escaping of ammonia rate 3ppm.
By the data under two units, a unit operating mode, the utility model is illustrated separately below.
(BMCR (Boiler maximum continuous rating): boiler maximum continuous steaming under two B of Unit MCR operating modes
Send out amount, mainly the EIAJ under 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, this device can change by flexible adaptation unit load, it is achieved full working scope denitrating flue gas processes, permissible
Avoid, owing to unit load changes, causing flue gas cigarette temperature to change, thus affect denitrating flue gas and process, more embody the excellent of device
More property.
In sum, denitrification apparatus of the present utility model and utilize the denitration method for flue gas of this device at least to have the advantages that
(1) denitrification apparatus of the present utility model can arrange heater flexibly and add thermal medium, it is also possible to coordinating the cigarette in later stage
Desulfurization technological design, by three grades of heating systems, reduces the fuel consumption of hot-blast stove 5 to greatest extent, and takes full advantage of
The steam waste heat of power plant and internal system waste heat, reach energy-saving and cost-reducing purpose；
(2) utilize this denitrification apparatus to avoid the need for transforming boiler body and the feature of back-end ductwork thereof, can as economizer with
Without the more excellent process choice of old unit in denitration space between air preheater；
(3) using ammoniacal liquor ammonia is a kind of ammonia mode processed with higher-security, Pump for Medium and Small Power Generating Set is had to the safety of excellence
Property and economy；
(4) save substantial amounts of boiler body retrofit work, significantly reduce construction investment, low dust-laden denitrification apparatus after deduster
Owing to not interfering with boiler improvement, thus also will not bring the adverse effect in terms of burning and efficiency to boiler, thus greatly
Meet the demand of energy-saving and environmental protection and safety in production；
(5) wear problem of denitrating catalyst and equipment thereof is solved so that the life-span of denitration device and catalyst is able to significantly
Extend, improve the performance driving economy of overall denitrification apparatus.
(6) avoid and use being significantly increased of the catalyst volume that brings of low temperature catalyst and cost, and give birth at low temperatures
Become the deposition that the ammonium salts such as ammonium hydrogen sulfate bring, the potential safety hazard blocking and corroding to system；
Embodiment described above is only to be described preferred embodiment of the present utility model, not to of the present utility model
Scope is defined, and on the premise of without departing from the utility model design spirit, those of ordinary skill in the art are to the utility model
The various deformation made of technical scheme and improvement, all should fall in the protection domain that the utility model claims determine.
Claims (5)
1. thermal power plant's low ash-laden gas SCR denitration device, it is characterised in that: flue includes former flue gases duct (3), neat stress
Flue (31), described former flue gases duct (3) arrival end is provided with flue gas vapors heater (2), and the port of export is provided with SCR
Reactor (14), also includes that inside is divided into the flue gas heat-exchange unit (4) of former flue gas chamber (41), neat stress chamber (42), institute
State former flue gas chamber (41), neat stress chamber (42) to connect with former flue gases duct (3), neat stress flue (31) respectively, described
SCR reactor (14) connects with neat stress flue (31), and described former flue gases duct (3) connects with hot-blast stove (5), institute
State flue gas vapors heater (2) to connect with steam drainage system, air vapor heater (8), described air vapor heater
(8) one end connects dilution air (7), and the other end connects ammoniacal liquor evaporimeter (9), and described ammoniacal liquor evaporimeter (9) is upper to be connected
There is ammoniacal liquor to store and supply system, be provided with for ammonia injection and the vortex mixer (13) of mixing in described former flue gases duct (3),
Described ammoniacal liquor evaporimeter (9) connects with vortex mixer (13).
Thermal power plant the most according to claim 1 low ash-laden gas SCR denitration device, it is characterised in that: described hot-blast stove
(5) upper connection has temperature adjustment blower fan (6).
Thermal power plant the most according to claim 1 and 2 low ash-laden gas SCR denitration device, it is characterised in that: described ammonia
Water stores and includes tank used for storing ammonia (11), ammoniacal liquor supply pump (10), adjustment mechanism for valve (12), described ammonia with supply system
Water supply pump (10) and adjustment mechanism for valve (12) are installed between tank used for storing ammonia (11) and ammoniacal liquor evaporimeter (9).
Thermal power plant the most according to claim 3 low ash-laden gas SCR denitration device, it is characterised in that: described ammoniacal liquor steams
Sending out device (9) porch and be provided with atomizer, described nozzle threads is connected to porch and is configured with dismountable flange.
Thermal power plant the most according to claim 4 low ash-laden gas SCR denitration device, it is characterised in that: described steam is dredged
Water system includes flash tank (17), drain tap, hydrophobic valve, and the upper connection of described flash tank (17) has low-pressure steam pipe network (18)
With condensate pipe net (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620095239.6U CN205517257U (en) | 2016-01-29 | 2016-01-29 | Ash -laden gas SCR denitrification facility hangs down in thermal power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620095239.6U CN205517257U (en) | 2016-01-29 | 2016-01-29 | Ash -laden gas SCR denitrification facility hangs down in thermal power plant |
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| Publication Number | Publication Date |
|---|---|
| CN205517257U true CN205517257U (en) | 2016-08-31 |
Family
ID=56774260
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620095239.6U Expired - Fee Related CN205517257U (en) | 2016-01-29 | 2016-01-29 | Ash -laden gas SCR denitrification facility hangs down in thermal power plant |
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| Country | Link |
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| CN (1) | CN205517257U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105521706A (en) * | 2016-01-29 | 2016-04-27 | 北京龙源环保工程有限公司 | SCR (selective catalytic reduction) denitration device for low-dust flue gas in thermal power plant and denitration method |
| CN109589788A (en) * | 2018-12-05 | 2019-04-09 | 武汉奥杰科技股份有限公司 | A kind of Novel flue gas denitrating system |
| CN111036072A (en) * | 2019-12-13 | 2020-04-21 | 西安润川环保科技有限公司 | Flue gas treatment system |
-
2016
- 2016-01-29 CN CN201620095239.6U patent/CN205517257U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105521706A (en) * | 2016-01-29 | 2016-04-27 | 北京龙源环保工程有限公司 | SCR (selective catalytic reduction) denitration device for low-dust flue gas in thermal power plant and denitration method |
| CN105521706B (en) * | 2016-01-29 | 2018-04-03 | 北京龙源环保工程有限公司 | The low ash-laden gas SCR denitration device of thermal power plant, method of denitration |
| CN109589788A (en) * | 2018-12-05 | 2019-04-09 | 武汉奥杰科技股份有限公司 | A kind of Novel flue gas denitrating system |
| 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 |
| CN111036072A (en) * | 2019-12-13 | 2020-04-21 | 西安润川环保科技有限公司 | Flue gas treatment system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160831 Termination date: 20190129 |