CN104645828B - A kind of SCR denitration device being applied to cement clinker production line kiln tail high-dust flue gas and method - Google Patents
A kind of SCR denitration device being applied to cement clinker production line kiln tail high-dust flue gas and method Download PDFInfo
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Abstract
The invention discloses a kind of SCR denitration device being applied to cement clinker production line kiln tail high-dust flue gas and method, including the cement kiln dore furnace, preheater, waste heat boiler, raw mill, electric cleaner and the kiln tail chimney that move towards to be sequentially connected with along flue gas；Also include that SCR reactor, SCR reactor include: reactor shell, top is with entrance divergent segment, and bottom is with ash bucket；SCR reactor inlet flue, connects preheater and entrance divergent segment, and arranges reducing agent injector；Some catalyst layers, are from top to bottom successively set in reactor enclosure body；Some steam sootblowers, with catalyst layer one_to_one corresponding the top that is arranged at corresponding catalyst layer；The upstream flue of SCR reactor outlet flue, coupled reaction device housing bottom and waste heat boiler or downstream flue, and set up high-temperature blower.The present invention, on the basis of being not provided with hot precipitator, can tackle high NOx load fluctuation, temperature fluctuation, the smoke transportation of high dust.
Description
Technical field
The invention belongs to industrial furnace flue gas nitrogen oxide Treatment process field, be specifically related to one and be applied to clinker
The SCR denitration device of production line stove high-dust flue gas and method.
Background technology
Control technology for the NOx of cement kiln dore furnace and mainly have three classes: low-NO_x combustion technology (Low NOx burner,
LNB), selective non-catalytic reduction (Selective Non-Catalytic Reduction, SNCR) and SCR
(Selective Catalytic Reduction, SCR) denitration technology.
Low-NO_x combustion technology includes the means such as low-NOx combustor, fuel-staged combustion, Researched of Air Staging Combustion Burning Pulverized Coal, mainly from control
The aspects such as oxygen processed supply or reduction flue-gas temperature are set about, and reduce the generation of thermal NO x, and its denitration effect is by clinker
Calcine technology restricts, and denitration efficiency it is generally acknowledged that stability is the best 15～30%, generally as compounding technique, reduces initial
NOx emission concentration, saves reducing agent consumption.
SNCR denitration technology, is to spray into the reduction containing amino in the appropriate location of cement kiln dore furnace and exhaust pass
Agent, makes the NOx generated in flue gas be reduced to N2.Key problem in technology be spray site reaction zone temperature need to be maintained at 850～
1050 DEG C, reducing agent can be mixed homogeneously with flue gas, and denitration efficiency be it is generally acknowledged more than 60%.
SCR denitration technology refers in the reactor being mounted with catalyst, sprays into suitable amino reductive, by flue gas
Nitrogen oxides fast and efficiently by flue gas in cement kiln generate NOx be optionally reduced to N2, denitration efficiency is typically recognized
For more than 80%, in thermal power plant's application maturation, but cement industry application achievement is less.External cement kiln dore furnace SCR
Denitration technology only has 3 cases, domestic still belongs to blank.Subject matter is catalyst problem and high dirt problem.
Such as, the Chinese invention patent application document of Application No. 201310390521.8 discloses cement kiln flue gas high temperature
Dust removal SCR denitrification apparatus, it is characterised in that: include the electric cleaner being connected with cement kiln preheaters, the output of electric cleaner
End is connected with blender by pipeline, and blender is provided with compressed air inlet, reducing agent entrance and reducing agent spray gun, mixing
The outfan of device is connected with SCR reactor by pipeline, is provided with catalyst in SCR reactor, and SCR reactor outfan is provided with
Flue gas after booster fan will purify is discharged downstream equipment.The beneficial effect of this application: high-temperature flue gas first passes through high-temperature electric and removes
Dirt device carries out depositing dust process, can effectively avoid flying dust SCR catalyst to cause abrasion, blocks and inactivate；Remove cement simultaneously
CaO granule in kiln flue gas, it is to avoid CaO granule itself causes blocking and and the SO of catalyst micropore3The CaSO that reaction generates4Right
The blocking that catalyst causes.
Hot precipitator is set, the most really can effectively solve high dirt to the abrasion of catalyst, block and inactivate, but
It is that Practical Project exists the transformation problems such as difficulty is big, the pressure loss is big, power consumption is high.Additionally, cement kiln dore furnace SCR reactor
Inlet flue gas temperature is about 320-350 DEG C, installs the temperature drop that the pre-dedusting of high temperature causes additional, also can reduce the activity of catalyst.
Summary of the invention
The invention provides a kind of SCR denitration device being applied to cement clinker production line kiln tail high-dust flue gas and side
Method, on the basis of being not provided with hot precipitator, can tackle the flue gas spy of high NOx load fluctuation, temperature fluctuation, high dust
Levy, can accomplish that denitration efficiency reliable and stable reaches more than 80%, the escaping of ammonia controls at 2.5mg/m3Below.
A kind of SCR denitration device being applied to cement clinker production line kiln tail high-dust flue gas, depends on including along flue gas trend
The cement kiln dore furnace of secondary connection, preheater, waste heat boiler, raw mill, electric cleaner and kiln tail chimney；Also include that SCR reacts
Device, described SCR reactor includes:
Reactor shell, this reactor shell top is with entrance divergent segment, and bottom is with ash bucket；
SCR reactor inlet flue, connects described preheater and entrance divergent segment, and this SCR reactor inlet flue sets
Put reducing agent injector；
Some catalyst layers, are from top to bottom successively set in described reactor enclosure body；
Some soot blowers, with catalyst layer one_to_one corresponding the top that is arranged at corresponding catalyst layer；
The upstream flue of SCR reactor outlet flue, coupled reaction device housing bottom and waste heat boiler or coupled reaction device
Housing bottom and the downstream flue of waste heat boiler, high-temperature blower set up by this SCR reactor outlet flue.
The present invention is directed to high dirt environment, at existing cement kiln dore furnace preheater, the waste heat moving towards along flue gas and being sequentially connected with
On the basis of boiler, raw mill, electric cleaner and kiln tail chimney, install SCR reactor additional by transformation, be not provided with the pre-dedusting of high temperature
Device, can successfully manage cement kiln end height dirt smoke evacuation environment, and accomplish degree of depth denitration.With flue gas flow direction, flue gas is from cement kiln end
Preheater higher level (C1 level) cyclone cylinder outlet converge flue appropriate point position draw high-temperature high dust flue gas, draw the place of connecing arrange electronic or
Pneumatic baffle door, flows through gas approach straight down, after completing Gas Parameters detection by flue gas inspection instrument, sprays in appropriate point position
Entering reducing agent, flue gas mixes with reducing agent, enters SCR reactor through flue water conservancy diversion, and SCR reactor inlet section is provided with gradually
Wealthy section, it is ensured that the flue gas flow field introducing SCR reactor is stable, and reactor straight section top is provided with commutator, then passes sequentially through 3
～6 layers of catalyst, after catalyst bed body completes catalytic denitration reaction, discharge from reactor lower part, discharge flue and set up height
Warm air machine, in order to overcome the denitration reaction pressure loss, sends existing flue system back to, successively via waste heat boiler, raw material by flue gas
Mill, cleaner unit, kiln a tail wind machine after funnel discharge.The SCR reactor that the present invention sets up by flue duct retrofit be arranged in preheater and
Between waste heat boiler, both can guarantee that the temperature range that the reaction of SCR reaction denitration is suitable, do not affected further through rational INSULATION DESIGN
Waste heat boiler thermal effect.
In the present invention, it is not provided with hot precipitator in SCR reactor front end, every layer of catalyst top is provided with steam and blows
Ash device and acoustic wave ash ejector combined unit, acoustic wave ash ejector breaks up big dust particle, and steam sootblower will retain to catalyst layer
On exhaust gas dust by soot blower be blown to bottom ash bucket in, can tackle dust concentration scope is 20～100g/m3.Catalyst
3～6 layers adjustable, can tackle initial NOx emission concentration 300～1200mg/m3, denitration rate can be up to more than 90%.This
Bright device can apply to high temperature denitration, and flue-gas temperature, up to 320-360 DEG C, adapts to all cement kiln end preheaters outlet cigarette
Gas row's temperature.
Accordingly, as preferably, described soot blower includes that acoustic wave ash ejector and steam sootblower, acoustic wave ash ejector and steam blow
Ash device cooperation.
All catalyst layers are each equipped with acoustic wave ash ejector and steam sootblower, the two synergy, and each soot blower is only
Erect and put control switch, denitration control system be uniformly controlled.Acoustic wave ash ejector and steam sootblower are arranged in catalyst
At layer top 0.4-0.8m.Further, it is distributed on the both sides sidewall in reactor enclosure body.Acoustic wave ash ejector passes through high pressure sound
Puffed rice dirt common in cement kiln flue gas is broken up by ripple, and steam sootblower ensures the completeness of soot blowing, and dust is sent into gas
Fluently in discharging with flue gas.
High-temperature blower of the present invention, its impeller material height heatproof, wear-resisting, select to ensure 400 DEG C indeformable,
100g/m3Dust content the most worn out, additionally configure frequency conversion motor, reply is mounted with the SCR reactor institute of different number of plies catalyst
The pressure loss that need to tackle.This high-temperature blower can use commercially available prod.
Reducing agent is arranged on SCR reactor inlet flue, and injection direction is parallel with flue gas flow direction, SCR reactor inlet
Reducing agent injector at flue uses two-fluid spray ammonia barrier, can realize 150% flue circle at the 1m of ammonia-spraying grid downstream
Face coverage rate, reducing agent uses the ammonia of 20-25wt%.
The reductant injection system of the present invention, is different from tradition SCR denitration system, uses two-fluid ammonia-spraying grid, liquid phase
Flowing through passage for required reducing agent, gas phase strengthens atomizing effect and mixability further.
As preferably, in described SCR reactor also includes being arranged at described reactor enclosure body and be positioned at entrance divergent segment and expand
The commutator in mouth downstream.It is stable by flue gas/ammonia importing reactor that the entrance of SCR reactor arranges flaring mouth, sets after entrance
Put commutator, be further ensured that the NOx concentration field of whole SCR reactor inlet section, reductant concentration, temperature field, velocity field
Meet general SCR reactor requirement.
As preferably, in described SCR reactor inlet flue, it is provided with smoke deflector.Flue gas is made to import SCR more smoothly
In reactor.
As preferably, described SCR reactor inlet flue is provided with the first flue gas inspection instrument；Described SCR reactor outlet
Flue is provided with the second flue gas inspection instrument and ammonia detector.
First flue gas inspection instrument, the second flue gas inspection instrument, the escaping of ammonia detector signal all send into denitration control system, in order to
Metering and control ammonia spraying amount.
Denitration control system uses classical control system, and the theory that denitration control system calculates needs ammonia amount, by reduction
The pneumatic control valve of agent ejector and mass flowmenter with the use of, determine the ammonia demand of reality.
As preferably, it is additionally provided with the storehouse pump being connected with described ash bucket.By this storehouse pump smoothly by defeated for the flue dust in ash bucket
Deliver to subsequent treatment process.
As preferably, described catalyst layer is set to 3～6 layers；Most preferably, be set to 6 layers, load several 3～6 layers adjustable.
As preferably, the catalyst of described catalyst layer uses cellular catalyst, and catalyst aperture is not less than 9mm, wall
Thick not less than 1.5mm.Catalyst is GU Generic Unit, and sectional dimension is 150mmX150mm.
This cellular catalyst can use this area conventional catalyst, and the aperture of catalyst need to meet above-mentioned requirements, to answer
To high dirt environment.
The SCR reactor of the present invention is arranged on the flue between kiln tail cyclone preheater and waste heat boiler, can be direct
Flue duct retrofit is become tubular reactor or transform conventional scr reactor as；SCR reactor can successfully manage inlet NOx concentration ripple
Dynamic, fluctuation range is at 250mg/m3～1000mg/m3, the transformation of the low nitrogen in its upstream and the SNCR denitration system that puts into operation are normally or fault opens
Stop, do not affect the properly functioning of SCR denitration system；SCR reactor can use ammonia as reducing agent, then arrange without other
Liquefied ammonia system and supporting safety measure, can save land used and operation and maintenance cost；SCR reactor is imported and exported flue and is arranged cigarette
Gas continuous on-line detection instrument (Continous Emmission Monitor System), the cigarette of SCR reactor inlet end CEMS
Gas detection parameter includes but not limited to: NOx concentration, flue gas flow, temperature, pressure, O2Content；SCR reactor outlet flue
CEMS detection parameter includes but not limited to: NOx concentration, temperature, pressure, O2；Reactor outlet also sets up the escaping of ammonia detector；
SCR reactor catalyst bed arranges 6 layers, loads number 3-6 layer adjustable, tackles different load fluctuations；Above every layer of catalyst
Rake steam sootblower is set, and the soot blowing frequency, blowing pressure, soot blowing tolerance is adjustable, according to actual condition, can accomplish in time
Ash discharge, moreover it is possible to accomplish energy-conservation；Every layer of catalyst arranges differential pressure transmitter, and signal delivers to control system, indicates catalyst blockage feelings
Condition, and participate in soot blowing programme-control.
Flue, SCR reactor material main body that in the present invention, flue gas flows through select Q345 steel, and hot expansibility is good, has
The local lined ceramics that the abrasions such as Wear-proof, smoke canal elbow reducing are serious, improves resistance to abrasion.
The present invention can directly be installed at low nitrogen burning (LNB) that present cement plant has been configured, selective non-catalytic also
After former (SNCR) denitration, LNB-SNCR denitration, do not affect the use of the denitration facility built up, with the use of reducing also
Former dose of consumption.
The present invention uses the ammonia of 20～25wt% as reducing agent, can better conform to the existing situation in cement plant, it is not necessary to
Increasing liquefied ammonia system, flow process is simple, floor space is little, operation and maintenance cost is low.
Present invention also offers a kind of method utilizing described device to carry out cement kiln dore furnace denitrating flue gas, cement kiln divides
Solve stove exit gas and sequentially pass through by the eliminating of kiln tail chimney after preheater, waste heat boiler, raw mill and electric cleaner process, described
Kiln exit gas warp after preheater the pre-heat treatment is introduced in SCR reactor by SCR reactor inlet flue, entrance divergent segment,
Spraying into reducing agent in SCR reactor inlet flue, flue gas flows through each catalyst layer successively with reducing agent after mixing, finally by
SCR reactor outlet flue and high-temperature blower send into upstream flue or the downstream flue of preboiler；Flue gas flows through catalyst layer
While, the dust in flue gas is blown in ash bucket by soot blower.
The processing method of the present invention sequentially passes through preheater, waste heat boiler, raw mill and cleaner unit at existing kiln exit gas
On the basis of being discharged by kiln tail chimney after process, the flue gas after preheater is got rid of sends into the SCR reactor that the present invention installs additional
In carry out catalytic reaction, to tackle the cement kiln dore furnace kiln exit gas intractable problem of height dust.
Compared with prior art, the present invention has the following technical effect that
(1) technology selected by, by improving Optimization of material selection design, Selection of Catalyst optimization designs, SCR structure of reactor
Form optimization design, soot blower optimization design, solve high dirt to the abrasion of catalyst, corrode and be poisoned, and the system caused
Abrasion perforation；
(2) flue contacted with high-temperature high dust gas and SCR reactor body material selection Q345 steel, hot expansibility
Good, there is the local lined ceramics that the abrasion such as Wear-proof, smoke canal elbow reducing is serious, improve resistance to abrasion；
(3) reply 80-100g/m3High dirt environment, the large aperture big wall thickness design of catalyst aperture and surface velocity, both
It is avoided that blocking that low flow velocity causes and poisoning, is avoided that the abrasion that high flow rate causes again.
(4) SCR reactor lower end arranges the wealthyest section and ash bucket, is arranged by ash bucket by dust settling by reducing flue gas flow rate
Go out；
(5) SCR reactor draught fan impeller material has high erosion resistance, improves system stability；
(6) can accomplish to save reducing agent, degree of depth denitration as existing low nitrogen or the extended technology of SNCR denitration technology
With minimizing emission intensity.
Accompanying drawing explanation
Fig. 1 is the structural representation of one embodiment of the present invention.
Fig. 2 is the structural representation of another embodiment of the present invention.
Shown in figure, reference is as follows:
1-cement kiln dore furnace 2-kiln tail flue 3-preheater
4-flue gas inspection instrument (CEMS-1) 5-conditioning Tower 6-waste heat boiler
7-the first flue gas inspection instrument 8-entrance divergent segment 9-soot blower
10-booster fan 11-the second flue gas inspection instrument 12-ammonia detector
13-catalyst layer 14-storehouse pump 15-electric cleaner
16-high-temperature blower 17-raw material bucket 18-kiln tail chimney
19-SCR reactor inlet flue 20-reactor shell 21-SCR reactor outlet flue.
Detailed description of the invention
The present invention is further illustrated with embodiment below in conjunction with the accompanying drawings, but is not intended as depending on restriction of the present invention
According to.
As depicted in figs. 1 and 2, a kind of SCR denitration device being applied to clinker kiln exit gas, cement kiln dore furnace 1
Kiln tail flue 2 be connected to preheater 3, kiln tail flue is provided with ammonia water spray device, in kiln tail flue spray ammonia, preheating
Device uses Pyatyi preheater, and kiln tail flue is connected to C5 (bottom) preheater of Pyatyi preheater, conditioning Tower 5 and waste heat boiler
6 are set up in parallel, and both upstream flues are all connected with C1 (top) preheater of Pyatyi preheater, and both downstream flues close
Being connected to raw mill 17 after and, raw mill downstream arranges electric cleaner 15, and electric cleaner downstream arranges kiln tail chimney 18, near C1
Flue at (top) preheater is provided with flue gas monitoring instrument (CEMS-1) 4, and above-mentioned accessory and connected mode all use ability
Territory conventional means.
Assembly of the invention focuses on the SCR reactor set up, and this SCR reactor sets up the bypass cigarette at waste heat boiler
On road, SCR reactor includes reactor shell 20, reactor shell 20 top with entrance divergent segment 8, entrance divergent segment 8
Enlarging is connected with reactor shell 20, connects SCR reactor inlet flue 19 at the reducing of entrance divergent segment, and SCR reactor enters
Mouth flue 19 is connected to the C1 preheater of Pyatyi preheater 3, arranges smoke deflector in SCR reactor inlet flue 19, and SCR is anti-
Answering and also set up reducing agent injector on device gas approach 19, this reducing agent injector ejector uses two-fluid spray ammonia barrier, instead
The bottom answering device housing arranges ash bucket, and ash bucket connects storehouse pump 14.
At the enlarging of entrance divergent segment 8, downstream arranges commutator, from top to bottom sets gradually 3～6 layers and urge below commutator
Agent layer 13, the top of every layer of catalyst layer is correspondingly arranged a soot blower 9, and soot blower includes acoustic wave ash ejector and steam soot blowing
Device, the two is used in combination, and is arranged at 0.4～0.8m place above corresponding catalyst layer, and steam sootblower employing rake steam blows
Ash device, steam sootblower external compressed air.
The bottom of reactor shell connects SCR reactor outlet flue 21, and this exhaust pass arranges a booster fan
10, and at one high-temperature blower 16 of added downstream of booster fan, this high-temperature blower uses commercially available prod, the downstream of high-temperature blower
Flue accesses the upstream flue (such as Fig. 1) of waste heat boiler 6 or accesses the downstream flue (such as Fig. 2) of waste heat boiler 6.
First flue gas inspection instrument 7 is set on SCR reactor inlet flue 19, SCR reactor outlet flue 21 arranges
Two flue gas inspection instrument 11 and ammonia detector 12, the first flue gas inspection instrument and the second flue gas inspection instrument are flue gas continuous on-line detection
Instrument.
All flue gas inspection instrument and peace detector and reducing agent injector are connected to denitration control system, and denitration controls system
System and control method use the control technology that this area is ripe.
Cement kiln dore furnace kiln exit gas sequentially passes through preheater 3, conditioning Tower 5, waste heat boiler 6, raw mill 17 and electricity and removes
Dirt device 15 is got rid of by kiln tail chimney 18 after processing, kiln exit gas after preheater the pre-heat treatment through by SCR reactor inlet cigarette
Road 19, entrance divergent segment 8 introduce in SCR reactor, spray into reducing agent, flue gas and reduction in SCR reactor inlet flue 19
Flow through each catalyst layer 13 successively after agent mixing, finally sent into foreheater by SCR reactor outlet flue 21 and high-temperature blower 16
The upstream flue of stove or downstream flue；While flue gas flows through catalyst layer, the dust in flue gas is blown to ash bucket by soot blower 9
In.
Embodiment 1
This embodiment is according to device as shown in Figure 1 and technique.Cement kiln dore furnace 10000Nm3/ h bypasses flue gas SCR denitration
Assay device, arranges bypass in waste heat boiler front and back end, draws actual flue gas, flue-gas temperature 350 DEG C ± 20 DEG C, dustiness 30-
100g/m3, NOx initial concentration 280-1200mg/m3 (there has been configuration SNCR denitration device SCR denitration reactor upstream, if on
Trip SNCR denitration device does not puts into operation, and initial concentration is up to 700-1200mg/m3, after upstream SNCR denitration device puts into operation, minimum can
To control NOx emission concentration at 200mg/m3, typically control at 320mg/m according to standard3Hereinafter, therefore, the big model of inlet NOx concentration
Enclose interior adjustable.
Refer to accompanying drawing 1, the bypass flue that kiln tail waste heat boiler front and back end is arranged configures SCR denitration reactor, bypass
Flue gas experience successively along flue gas direction flue deflector, SCR reactor inlet divergent segment, commutator, the first catalyst layer, second
Catalyst layer, the 3rd catalyst layer, the 4th catalyst layer, the 4th catalyst layer, the 6th catalyst layer, SCR reactor outlet cigarette
Road, air-introduced machine, drain into waste heat boiler downstream flue, be incorporated to main body flue gas.
Wherein every layer of catalyst top is provided with steam sootblower, purges pressure 0.8MPa, and reducing agent is arranged in SCR reaction
On device gas approach, injection direction is parallel with flue gas flow direction, and reducing agent uses the ammonia of 20-25wt%, and SCR reactor lower part sets
Being equipped with ash bucket, SCR reactor inlet flue is provided with the first flue gas on-line detector, and monitoring index has NOx, flue gas flow Q, cigarette
Temperature T, flue gas oxygen content, SCR reactor outlet flue is provided with the 2nd CEMS, and monitoring index has NOx concentration, flue gas flow
Q, flue-gas temperature T, flue gas oxygen content, NH3Concentration.
Under conditions of SNCR denitration device puts into operation, on a CEMS, NOx concentration is 280-320mg/m3, ammonia consumption exists
During 5l/h, the second flue gas inspection instrument NOx concentration is 140-160mg/m3, denitration efficiency is about 50%；Ammonia consumption is 10l/h
Time, on the 2nd CEMS, NOx concentration is 50-75mg/m3, denitration efficiency is about 80%；When ammonia consumption is 15l/h, the 2nd CEMS
Upper NOx concentration is 15-35mg/m3, denitration rate can be high by 95%, emission intensity concentration equal ＜ 3mg/m3；
Under conditions of SNCR denitration device is stopped transport, on a CEMS, NOx concentration is 750-1200mg/m3, ammonia consumption
When 10l/h, the second flue gas inspection instrument NOx concentration is 320-500mg/m3, denitration efficiency is about 50%；Ammonia consumption is 15l/
During h, on the 2nd CEMS, NOx concentration is 140-160mg/m3, denitration efficiency is about 80%；When ammonia consumption is 20l/h, second
The upper NOx concentration of CEMS is 35-50mg/m3, denitration rate about 95%, emission intensity concentration equal ＜ 3mg/m3；.
Embodiment 2
This embodiment is according to device as shown in Figure 2 and technique.The cement kiln dore furnace SCR denitration work of daily output 2500t grog
Journey, full flue gas degree of depth denitration, exhaust gas volumn 295000m3/ h, flue-gas temperature 350 DEG C ± 20 DEG C, dustiness 30-100g/m3, at the beginning of NOx
Beginning concentration 280-1200mg/m3(there has been configuration SNCR denitration device SCR denitration reactor upstream, if upstream SNCR denitration dress
Putting and do not put into operation, initial concentration is up to 700-1200mg/m3, after upstream SNCR denitration device puts into operation, minimum can control NOx emission
Concentration is at 200mg/m3, typically control at 320mg/m according to standard3Hereinafter, therefore, inlet NOx concentration is adjustable on a large scale.
Referring to accompanying drawing 2, set up SCR denitration reactor in waste heat boiler front end, after denitration, flue gas drains into preboiler,
Flue gas experience successively along flue gas direction flue deflector, SCR reactor inlet divergent segment, commutator, the first catalyst layer, second
Catalyst layer, the 3rd catalyst layer, the 4th catalyst layer, the 5th catalyst layer, the 6th catalyst layer, SCR reactor outlet cigarette
Road, air-introduced machine, drain into waste heat boiler upstream trip flue, successively after waste heat boiler, high-temperature blower, raw mill, cleaner unit, by kiln
A tail wind machine drains into kiln tail chimney.
Wherein every layer of catalyst top is provided with steam sootblower, and reducing agent is arranged on SCR reactor inlet flue, spray
Penetrating direction parallel with flue gas flow direction, can realize 150% flue interface coverage rate at the 1m of ammonia-spraying grid downstream, reducing agent uses
The ammonia of 20-25wt%, SCR reactor lower part is provided with ash bucket, and SCR reactor inlet flue is provided with the first flue gas and examines online
Surveying instrument, monitoring index has NOx, flue gas flow Q, flue-gas temperature T, flue gas oxygen content, SCR reactor outlet flue to be provided with second
CEMS, monitoring index has index to have NOx concentration, flue gas flow Q, flue-gas temperature T, flue gas oxygen content, NH3Concentration.
Under conditions of SNCR denitration device puts into operation, on a CEMS, NOx concentration is 280-320mg/m3, ammonia consumption exists
During 100l/h, the second flue gas inspection instrument NOx concentration is 130-165mg/m3, denitration efficiency is about 50%；Ammonia consumption is 150l/
During h, on the 2nd CEMS, NOx concentration is 50-80mg/m3, denitration efficiency is about 80；When ammonia consumption is 200l/h, the 2nd CEMS
Upper NOx concentration is 15-35mg/m3, denitration rate 95%；
Under conditions of SNCR denitration device is stopped transport, on a CEMS, NOx concentration is 750-800mg/m3, ammonia consumption exists
During 300l/h, the second flue gas inspection instrument NOx concentration is 140-160mg/m3, denitration efficiency is about 50%；Ammonia consumption is 450l/
During h, on the 2nd CEMS, NOx concentration is 140-160mg/m3, denitration efficiency is about 80%；When ammonia consumption is 600l/h, second
The upper NOx concentration of CEMS is 50mg/m3, denitration rate 95%, emission intensity concentration equal ＜ 3mg/m3。
Claims (7)
1. it is applied to a SCR denitration device for cement clinker production line kiln tail high-dust flue gas, moves towards successively including along flue gas
Cement kiln dore furnace, preheater, waste heat boiler, raw mill, electric cleaner and the kiln tail chimney connected；It is characterized in that, also wrap
Including SCR reactor, described SCR reactor includes:
Reactor shell, this reactor shell top is with entrance divergent segment, and bottom is with ash bucket；
SCR reactor inlet flue, connects described preheater and entrance divergent segment, and this SCR reactor inlet flue is arranged also
Former dose of ejector；
Some catalyst layers, are from top to bottom successively set in described reactor enclosure body；
Some soot blowers, with catalyst layer one_to_one corresponding the top that is arranged at corresponding catalyst layer；Described soot blower includes sound
Ripple soot blower and steam sootblower, acoustic wave ash ejector and steam sootblower cooperation；
The upstream flue of SCR reactor outlet flue, coupled reaction device housing bottom and waste heat boiler or coupled reaction device housing
Bottom and the downstream flue of waste heat boiler, high-temperature blower set up by this SCR reactor outlet flue；
Described SCR reactor inlet flue is provided with the first flue gas inspection instrument, and described SCR reactor outlet flue is provided with second
Flue gas inspection instrument and ammonia detector.
It is applied to the SCR denitration device of cement clinker production line kiln tail high-dust flue gas, its feature the most according to claim 1
It is, in described SCR reactor also includes being arranged at described reactor enclosure body and be positioned at the rectification in entrance divergent segment enlarging downstream
Device.
It is applied to the SCR denitration device of cement clinker production line kiln tail high-dust flue gas, its feature the most according to claim 1
It is, in described SCR reactor inlet flue, is provided with smoke deflector.
It is applied to the SCR denitration device of cement clinker production line kiln tail high-dust flue gas, its feature the most according to claim 1
It is, is additionally provided with the storehouse pump being connected with described ash bucket.
It is applied to the SCR denitration device of cement clinker production line kiln tail high-dust flue gas, its feature the most according to claim 1
Being, described catalyst layer is set to 3～6 layers.
It is applied to the SCR denitration device of cement clinker production line kiln tail high-dust flue gas, its feature the most according to claim 1
Being, the catalyst of described catalyst layer uses cellular catalyst, and catalyst aperture is not less than 9mm, and wall thickness is not less than
1.5mm。
7. utilizing the method that the arbitrary described device of claim 1～6 carries out cement kiln dore furnace denitrating flue gas, cement kiln divides
Solve stove exit gas and sequentially pass through by the eliminating of kiln tail chimney after preheater, waste heat boiler, raw mill and electric cleaner process,
It is characterized in that,
Described kiln exit gas after preheater the pre-heat treatment through by SCR reactor inlet flue, entrance divergent segment introduce SCR anti-
Answering in device, spray into reducing agent in SCR reactor inlet flue, flue gas flows through each catalyst layer after mixing with reducing agent successively,
Upstream flue or the downstream flue of preboiler is finally sent into by SCR reactor outlet flue and high-temperature blower；Flue gas flows through urges
While agent layer, the dust in flue gas is blown in ash bucket by soot blower.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6156277A (en) * | 1995-09-08 | 2000-12-05 | Elex Ag | Exhaust gas cleaning plant for a cement rotary kiln |
| CN101322902A (en) * | 2008-07-25 | 2008-12-17 | 江苏中科节能环保技术有限公司 | Uniset for controlling cement kiln flue gas |
| CN102512925A (en) * | 2011-12-07 | 2012-06-27 | 浙江天蓝环保技术股份有限公司 | Denitration process and denitration apparatus for cement kiln flue gas |
| CN102698600A (en) * | 2012-05-31 | 2012-10-03 | 娄卡奔新能源科技发展(上海)有限公司 | System for intelligently controlling flue gas denitrification of cement plant based on selective catalytic reduction (SCR) method |
| CN102730997A (en) * | 2011-04-04 | 2012-10-17 | 蒂森克虏伯伯利休斯股份有限公司 | Method and installation for producing cement clinker |
| CN102921297A (en) * | 2012-11-21 | 2013-02-13 | 江苏中建材环保研究院有限公司 | SCR denitrification device for dedusting smoke of cement kiln at high temperature |
| CN103406006A (en) * | 2013-08-30 | 2013-11-27 | 安徽省元琛环保科技有限公司 | SCR (Selective Catalytic Reduction) denitration device for NOx control of rotary cement kiln |
| CN103459963A (en) * | 2011-02-08 | 2013-12-18 | 艾里克斯希姆凯特股份公司 | Process and plant for producing cement clinker |
| CN203489717U (en) * | 2013-08-08 | 2014-03-19 | 温涛 | Novel high-efficiency energy-saving flue gas denitration device |
| CN204619751U (en) * | 2015-02-12 | 2015-09-09 | 浙江省环境保护科学设计研究院 | A kind of SCR denitration device being applied to cement clinker production line kiln tail high-dust flue gas |
-
2015
- 2015-02-12 CN CN201510077148.XA patent/CN104645828B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6156277A (en) * | 1995-09-08 | 2000-12-05 | Elex Ag | Exhaust gas cleaning plant for a cement rotary kiln |
| CN101322902A (en) * | 2008-07-25 | 2008-12-17 | 江苏中科节能环保技术有限公司 | Uniset for controlling cement kiln flue gas |
| CN103459963A (en) * | 2011-02-08 | 2013-12-18 | 艾里克斯希姆凯特股份公司 | Process and plant for producing cement clinker |
| CN102730997A (en) * | 2011-04-04 | 2012-10-17 | 蒂森克虏伯伯利休斯股份有限公司 | Method and installation for producing cement clinker |
| CN102512925A (en) * | 2011-12-07 | 2012-06-27 | 浙江天蓝环保技术股份有限公司 | Denitration process and denitration apparatus for cement kiln flue gas |
| CN102698600A (en) * | 2012-05-31 | 2012-10-03 | 娄卡奔新能源科技发展(上海)有限公司 | System for intelligently controlling flue gas denitrification of cement plant based on selective catalytic reduction (SCR) method |
| CN102921297A (en) * | 2012-11-21 | 2013-02-13 | 江苏中建材环保研究院有限公司 | SCR denitrification device for dedusting smoke of cement kiln at high temperature |
| CN203489717U (en) * | 2013-08-08 | 2014-03-19 | 温涛 | Novel high-efficiency energy-saving flue gas denitration device |
| CN103406006A (en) * | 2013-08-30 | 2013-11-27 | 安徽省元琛环保科技有限公司 | SCR (Selective Catalytic Reduction) denitration device for NOx control of rotary cement kiln |
| CN204619751U (en) * | 2015-02-12 | 2015-09-09 | 浙江省环境保护科学设计研究院 | A kind of SCR denitration device being applied to cement clinker production line kiln tail high-dust flue gas |
Non-Patent Citations (1)
| Title |
|---|
| 水泥窑炉烟气催化还原脱硝技术研究进展;房晶瑞等;《环境污染与防治》;20130228;第35卷(第2期);85-92 * |
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Address after: 310007 No. 109 Tianmu Mountain Road, Hangzhou, Zhejiang, Xihu District Co-patentee after: ZHEJIANG HUANKE ENVIRONMENT TECHNOLOGY CO.,LTD. Patentee after: Zhejiang Institute of ecological environmental science design and research Address before: 310007 No. 109 Tianmu Mountain Road, Hangzhou, Zhejiang, Xihu District Co-patentee before: ZHEJIANG HUANKE ENVIRONMENT TECHNOLOGY Co.,Ltd. Patentee before: ENVIRONMENTAL RESEARCH AND DESIGN INSTITUTE OF ZHEJIANG PROVINCE |
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Effective date of registration: 20200824 Address after: 310007 No. 109 Tianmu Mountain Road, Hangzhou, Zhejiang, Xihu District Co-patentee after: ZHEJIANG HUANKE ENVIRONMENT RESEARCH INSTITUTE Co.,Ltd. Patentee after: Zhejiang Institute of ecological environmental science design and research Address before: 310007 No. 109 Tianmu Mountain Road, Hangzhou, Zhejiang, Xihu District Co-patentee before: ZHEJIANG HUANKE ENVIRONMENT TECHNOLOGY Co.,Ltd. Patentee before: Zhejiang Institute of ecological environmental science design and research |