CN109603545A - A kind of SCR denitration method and device for combining soot blowing - Google Patents
A kind of SCR denitration method and device for combining soot blowing Download PDFInfo
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- CN109603545A CN109603545A CN201811617575.2A CN201811617575A CN109603545A CN 109603545 A CN109603545 A CN 109603545A CN 201811617575 A CN201811617575 A CN 201811617575A CN 109603545 A CN109603545 A CN 109603545A
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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
- B01D53/90—Injecting reactants
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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
- B01D53/8631—Processes characterised by a specific device
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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
- B01D53/8696—Controlling the catalytic process
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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
- B01D53/96—Regeneration, reactivation or recycling of reactants
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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
Abstract
The invention discloses a kind of SCR denitration method and device for combining soot blowing, including SCR reactor, the top of every layer of catalyst bed sets gradually steam sootblower and acoustic wave ash ejector against flue gas flow direction in reactor；Pressure difference transmitter is set between the upper and lower of every layer of catalyst bed；External high-temperature steam gas source after all steam sootblowers are in parallel is respectively provided with high-temperature steam motor-driven valve on each parallel pipeline, temperature sensor is arranged on general pipeline；External compressed air gas source after all sonic sensor is in parallel is arranged compressed air motor-driven valve on each parallel pipeline, pressure transmitter is arranged on general pipeline；It further include controller, temperature sensor, pressure transmitter and all pressure difference transmitters access the controller, all high steam motor-driven valves and the equal access controller of compressed air motor-driven valve.The present invention solves the problems, such as that large grained particulate matter can not be removed cement furnace SCR denitration particle content, simple steam sootblower consumption steam causes heat-energy losses big greatly, in flue dust.
Description
Technical field
The present invention relates to industrial furnace flue gas nitrogen oxide Treatment process fields, and in particular to a kind of SCR for combining soot blowing
Titter method and device, is especially applied to the selective-catalytic-reduction denitrified skill of cement clinker production line kiln tail high-dust flue gas
Art (Selective Catalytic Reduction, SCR).
Background technique
Catalyst is the core of SCR denitration technology, other than inherent active constituent, guarantees catalyst in the process of running
Environment temperature and catalyst specific surface area it is most important, therefore the purging of catalyst is essential group of SCR denitration technology
At part, for the soot blowing technology of SCR denitration complete sets of Techniques, there are two main classes: steam sootblower and acoustic wave ash ejector at present.
SCR denitration technology is mature in power plant's application, but slow in cement industry popularization and application progress, mainly there is three aspects
Reason: first is that cement plant particle concentration superelevation, it is generally recognized that power plant dust concentration > 30g/m3As high dirt environment, and cement
Factory's dust concentration is often as high as 60-80g/m3, it is 2-3 times of particle concentration in coal steam-electric plant smoke, is huge for catalyst
Disaster.Second is that existing clinker production technology is suspension waste heat technology, internal system pressure balance requires high, high dirt problem
Once leading to catalyst blockage, it will influence the normal operation of entire production system.Third is that according to state of the art, under measuring and calculating
The operating cost come is excessively high.
SCR denitration soot blowing technology, than selecting, selects independent soot blowing technology generally according to smoke transportation.The high dirt of clinker line
Environment SCR denitration technology usually selects steam sootblower, has achieved good application effect really in ash disposal, but due to
The consumption of steam affects the waste heat boiler thermal effect in downstream, affects the generated energy of waste heat boiler, and cement production enterprise is thought largely to steam
Vapour consumption is unacceptable.It is therefore proposed that combining sonic soot blowing on the basis of steam blowing technique.
Involved by joint soot blowing technology has in application No. is the patent of CN2015 1 0921852, including gas approach,
Ammonia-spraying grid, connection flue, equal conductance flowing plate, flow straightening grid, reactor shell, Catalytic Layer, joint soot blower, outlet cigarette
Road.Gas approach, connection flue, reactor shell, exhaust pass are sequentially connected along flue gas trend, and ammonia-spraying grid is arranged in entrance
On flue, equal conductance flowing plate and flow straightening grid are both placed in connection flue, and flow straightening grid is below equal conductance flowing plate, catalysis
It is placed in reactor enclosure body, joint soot blower is located at the corresponding position of reactor shell.But there are Railway Projects: (1)
The patent uses gas source of the compressed air as rake soot blower, and the compressed air of low temperature enters SCR reactor, can reduce reaction
The temperature of bed body, leads to catalyst activity reduction, will lead in hot fume in addition, the compressed air of low temperature enters SCR reactor
Moisture liquefy to the cold, reinforce flue gas in particulate matter adhesiveness；(2) by acoustic wave ash ejector and rake soot blower cloth in patent
It sets in sustained height, there is inoperable property in actual operation, usual acoustic wave ash ejector is that static element, rake soot blower are
Workpiece, being arranged in sustained height will unavoidably collide；(3) acoustic wave ash ejector is closely conducive to energy apart from catalyst excessively
Transmitting, but closely will affect catalyst strength and service life excessively, it is inadequate apart from the too far energy transmission that will lead to of catalyst, it is excessively high
Frequency operation also will affect intensity and the service life of catalyst.
Summary of the invention
Big for high dirt SCR denitration compressed air temperature drop, simple high temperature soot blowing technology steam consumption quantity is big, and energy consumption is high to ask
Topic:
The present invention provides a kind of SCR denitration device for combining soot blowing, including SCR reactor, the SCR reactor heads
Setting gas inlet, bottom setting exhanst gas outlet, inside set gradually several layers catalyst bed along flue gas flow direction；Every layer of catalysis
The top of agent bed sets gradually steam sootblower and acoustic wave ash ejector against flue gas flow direction；The upper and lower of every layer of catalyst bed it
Between pressure difference transmitter is set；External high-temperature steam gas source after all steam sootblowers are in parallel is respectively provided with high temperature on each parallel pipeline
Temperature sensor is arranged on general pipeline in steam motor-driven valve；External compressed air gas source after all sonic sensors are in parallel, each parallel connection
Compressed air motor-driven valve is set on pipeline, pressure transmitter is set on general pipeline；
It further include controller, the temperature sensor, pressure transmitter and all pressure difference transmitters access should
Controller, all high steam motor-driven valves and compressed air motor-driven valve access and are controlled by the controller.
The present invention proposes the joint soot-blowing mode of " high-temperature steam soot blower+acoustic wave ash ejector ", and differential pressure is combined to determine work
Condition normally whether, automatically select nominal situation purging program and unusual service condition purging program, unusual service condition especially set out is alternately blown
The control prevention of ash, can obtain beneficial effect.Essentially consist in: general cement production enterprise is equipped with waste heat boiler, can be direct
Use high-temperature steam as the heat source of rake soot blower, high-temperature steam avoids low temperature compressed air and enters system caused by system
Temperature drop, and thus caused by particulate matter adhesiveness increase, dust fouling the problems such as, catalyst anti-clogging and keep be suitable for
Temperature Activity on have significant meaning；Second, being used in combination for steam sootblower and acoustic wave ash ejector avoids two kinds of technologies
The short slab of exclusive use has given full play to the advantage that two kinds of technical combinations use, and is guaranteeing that there is a situation where block for catalyst
Under, energy consumption can save 75% or more；Third, setting unusual service condition purge program, are alternately made using sonic soot blowing and steam soot blowing
Industry mode strengthens soot blowing effect, has remarkable result improving system stability and energy-saving square face.
Preferably, the corresponding catalyst bed upper surface 350-450mm of steam nozzle hole distance of the steam sootblower；Institute
State the corresponding catalyst bed upper surface 750-800mm of center line distance of acoustic wave ash ejector.
Preferably, the high-temperature steam gas source, which draws, is connected to waste heat boiler.
Preferably, ash bucket is arranged in the bottom of the SCR reactor, and ash bucket scavenging conduit is arranged in ash bucket wall surface；The ash bucket is blown
It sweeps pipe and is parallel to the setting of ash bucket wall surface, open up purge hole on the scavenging conduit, the purge hole is towards ash bucket wall surface and purging side
To perpendicular to ash bucket wall surface.
Further, vertical interval of the center line of the ash bucket scavenging conduit apart from ash bucket wall surface is 200mm.
Ash bucket is set in reactor bottom, one circle purging pipeline of ash bucket wall surface and exhaust pass configuration purges pipe arrangement
There is purging aperture, by the purging of compressed air, the particulate matter purged is avoided to deposit in SCR reactor bottom.As excellent
Choosing is parallel to slope surface wall direction in the scavenging conduit that bottom is laid, and apart from slope surface 200mm, purge hole is kept away towards vertical walls direction
Exempt to purge hole plug, guarantee that air-flow is smooth.
Further preferably, setting storehouse in bottom ash bucket lower part pumps, and it is defeated by the particulate matter of ash bucket part to pump Pneumatic ash conveying by storehouse
It is sent to grey library.
Preferably, the flue scavenging conduit of walling of flue is arranged parallel in the bottom water outlet flue of the SCR reactor, it is described
Open up purge hole on flue scavenging conduit, purge hole is towards flue gas flow direction.
As preferred；Before SCR system is out of service, the primary complete purging of steam sootblower system starting, bottom ash
The primary complete purging of bucket starting.
Preferably, the steam sootblower includes:
The rake structure of inside reactor is protruded into, if including a main pipe and being provided in main pipe and being open vertically downwards
Dry aperture, the external high-temperature steam gas source of main pipe；
It is fixed on SCR reactor interior plate and is located at the horizontal shore at main pipe both ends, the both ends of the main pipe
It is placed on corresponding horizontal shore and opposite can slide；
And the executing agency outside SCR reactor, drive the rake structure to slide along horizontal shore.
Executing agency pushes the movement of rake structure level, purges to the entire upper surface of catalyst layer.
The present invention also provides a kind of SCR denitration method for carrying out joint soot blowing using the SCR denitration device, flue gas by
Gas inlet enters in SCR reactor, is successively discharged after the purification of several layers catalyst bed by exhanst gas outlet, reaction process
The particulate matter of corresponding catalyst bed upper surface is purged, which is characterized in that the purge is as follows:
Under nominal situation, starting acoustic wave ash ejector purging, steam sootblower is spare, an acoustic wave ash ejector purge cycles
Interior, acoustic wave ash ejector from top to bottom successively starts；As the catalyst pressure difference > 300Pa that any pressure difference transmitter detects, control
Device processed encrypts the starting frequency of acoustic wave ash ejector automatically, until the equal < of catalyst differential pressure that all pressure difference transmitters detect
300Pa；
If catalyst differential pressure is more than that 300Pa continues 2h, is considered as unusual service condition after acoustic wave ash ejector starts encipheror；It is different
Under normal operating condition: acoustic wave ash ejector and steam sootblower alternate run.
The present invention is the leading method of operation with energy-efficient acoustic wave ash ejector, by interval in short-term, the purging of high frequency time, is avoided
Particulate matter is deposited in catalyst surface in flue gas；Under the conditions of unusual service condition, acoustic wave ash ejector can be by rice krispies garland shape in flue gas
Large particle is shatter, strengthens the soot blowing effect of steam sootblower, with sound wave be dominate, high-temperature steam be auxiliary joint soot blowing side
System stability can be improved in formula, accomplishes 60% or more comprehensive energy consumption decline.
Preferably, the program of alternate run are as follows: the starting of first layer acoustic wave ash ejector, first layer steam sootblower starting fortune
Row；The starting operation of second layer acoustic wave ash ejector, the starting operation of second layer steam sootblower, and so on, until lowest level is catalyzed
The acoustic wave ash ejector and steam sootblower of agent successively start end of run.
Specific: first layer: first layer acoustic wave ash ejector pneumatic operated valve opens → first layer acoustic wave ash ejector work → first layer
Automatically pass → first layer steam sootblower valve opens → first layer steam sootblower advance → first layer steaming to acoustic wave ash ejector pneumatic operated valve
Be delayed 1min for vapour soot blower retrogressing → first layer steam sootblower valve closes →, and delay herein refers to arrives after acoustic wave ash ejector is closed
The interval time that steam sootblower is opened.
→ the second layer: each component start and stop program, duration, the same first layer of action delay
→ third layer: each component start and stop program, duration, the same first layer of action delay
→ the four layer: each component start and stop program, duration, the same first layer of action delay
→ layer 5: each component start and stop program, duration, the same first layer of action delay.
Preferably, when temperature sensor monitors gas source temperature lower than 300 DEG C, chain steam sootblower motor-driven valve is always
It is in close state.
Preferably, under nominal situation, in the purge cycles of an acoustic wave ash ejector, single sound wave purge time is 2~4s,
Interval time is 10~15 seconds；Purge cycles are 30-60min., acoustic wave ash ejector intermittent control shaking, acoustic wave ash ejector is by compression sky
Conductance enters, and is conducted to sounding film, vibrational energy is formed, when the purge time of acoustic wave ash ejector refers to the ventilation of compressed air
Between, interval time refers to that breaking compressed air from a upper acoustic wave ash ejector is passed through compressed air to next acoustic wave ash ejector
Time.It is further preferred that single sound wave purge time is 3s, interval time is 10 seconds.
Preferably, under acoustic wave ash ejector encipheror, purge cycles are 18~22min.Further preferably 20min.
The present invention solve cement furnace SCR denitration particle content is big, in flue dust large grained particulate matter can not remove,
Simple steam sootblower consumption steam causes heat-energy losses big, and a kind of effective SCR denitration remodeling method.With it is existing
Technology is compared, the invention has the advantages that:
(1) the joint soot blowing technology selected by, come into operation under nominal situation ultrasonic wave soot blower, and being conducive to will be caused by skinning
Large particle is broken up, and dust is prevented to accumulate in catalyst surface, and low energy consumption for acoustic wave ash ejector, movement is fast, is able to maintain catalyst
Continuous cleaning.The more thorough steam sootblower of the purging effect that comes into operation when unusual service condition, guarantee system operation stability and can
By property.Guarantee utmostly accomplish energy conservation under the premise of catalyst is not blocked.
(2) acoustic wave ash ejector+ultrasonic wave soot blower integrated mode, operation mode is flexible, adjustable, accomplishes energy conservation and environmental protection
Lay equal stress on.Solves the difficulty that individual acoustic wave ash ejector reply blocking needs shutdown system to overhaul, because of the high frequency of acoustic wave ash ejector
Secondary purging, steam sootblower enable the frequency and are greatly reduced, and the operating cost of soot blower can save 75% or more.
(3) for the particulate matter purged, ash bucket is further set in SCR reactor bottom and storehouse pumps, and mating steaming
Vapour purging, avoids dust in the deposition of reactor bottom.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the out of stock device of SCR of the present invention.
Fig. 2 is present invention joint soot blower arrangement schematic diagram.
Fig. 3 is the fit system figure between blowing pipe and ash bucket inner wall.
Appended drawing reference as shown in the figure is as follows:
1- catalyst bed 2- steam sootblower 3- acoustic wave ash ejector
4- pressure difference transmitter 5- compressed air electromagnetic valve 6- high-temperature steam motor-driven valve
7- temperature sensor 8- pressure transmitter 9- ash bucket
10- ash bucket scavenging conduit 11- flue purges pipeline
L1- steam sootblower install high L2- acoustic wave ash ejector install high L3- ash bucket scavenging conduit track pitch from
Degree degree slope surface distance (200mm)
Specific embodiment
As shown in FIG. 1 to 3, a kind of out of stock device of SCR for combining soot blowing, including SCR reactor, in present embodiment,
SCR reactor uses vertical structure, i.e. catalyst is arranged in vertical passageway, and smoke inlet is located at SCR reactor head, flue gas
Outlet is located at SCR reactor bottom, several layers catalyst bed 1 is from top to bottom arranged in reactor, catalyst bed 1 is routinely
Arrangement in SCR reactor.
One layer of steam sootblower 2, setting sound in the top tower wall of every layer of steam sootblower 2 is arranged in the top of every layer of catalyst
Wave soot blower 3, mounting height of the steam sootblower 2 apart from corresponding catalyst bed upper surface is L1, L1 350-450mm, sound
Wave soot blower 3 is L2, L2 750-800mm with corresponding 1 upper surface mounting height of catalyst bed.
The structure of steam sootblower 2 and acoustic wave ash ejector 3 itself can be used existing conventional structure, in present embodiment, sound
Wave soot blower is conventional horn mouth shape, and horn mouth radial direction slightly tilts down 7 degree of arrangements in level, grieshoch is avoided to fall into loudspeaker
Mouth deposition blocking, according to each layer of catalyst top arrangement one or more of SCR reactor cross section product size, single sonic soot blowing
The generation energy of device is 10000-15000 sound watt.There are three major parts to form for steam sootblower: (1) protruding into inside reactor
Rake structure, You Yigen main pipe opens several apertures straight down, is self weight and the purging impact force of main pipe, at main pipe both ends
SCR inside reactor side plate on arrangement supporting beam as motion guide rail；(2) external to have actuator and high steam gas source electronic
Valve pushes rake structure soot blower to move forward or back in the horizontal direction, and actuator leans on electrical energy drive；(3) actuator and rake are blown
Main pipe is swept, is connect by the high-pressure steam pipe vertical with rake purging main pipe, the length of connecting pipe is true according to stroke directions distance
Fixed, installation point preferably connects at middle part, and eccentric structure also may be appropriately used according to the arrangement of catalyst hole for hoist, manhole etc..
Steam sootblower 2 comes from waste heat boiler, all steamings by the external high-temperature steam of pipeline, the gas source of the high-temperature steam
Vapour soot blower 2 is connected in parallel, and high-temperature steam motor-driven valve 6 is independently arranged on each parallel pipeline, temperature sensor 7 is arranged on general pipeline.
3 external compressed air of acoustic wave ash ejector, all acoustic wave ash ejectors 3 are in parallel, and compressed air electricity is independently arranged on each parallel pipeline
Pressure transmitter 8 is arranged on general pipeline for magnet valve 5.
Ash bucket 9 is arranged in SCR reactor bottom, and one circle purging pipeline of ash bucket wall surface and exhaust pass configuration purges pipeline cloth
It is equipped with purging aperture, by the purging of compressed air, the particulate matter purged is avoided to deposit in SCR reactor bottom.SCR is anti-
The purging pipeline of device exhaust pass wall surface is answered to be parallel to walling of flue setting, purge hole is arranged towards perpendicular to flue wall direction.Ash
Bucket 9 is parallel to slope surface wall direction in the ash bucket scavenging conduit 10 that bottom is laid, and apart from slope surface 200mm, purge hole is towards vertical walls
Direction avoids purging hole plug, guarantees that air-flow is smooth.Bottom ash bucket lower part is arranged storehouse and pumps, and pumps Pneumatic ash conveying for ash bucket by storehouse
Partial particulate matter is transported to grey library.Before SCR system is out of service, the primary complete purging of steam sootblower system starting,
The primary complete purging of bottom ash bucket starting.
Pressure difference transmitter 4 is set between the upper and lower of every layer of catalyst bed, refers to catalysis above catalyst bed herein
Region between agent bed top surface and the steam sootblower of top, catalyst bed lower section refer to catalyst bed bottom surface and lower section sound
Region between wave soot blower, pressure difference transmitter detect the pressure difference of every layer of catalyst bed upper and lower, and all pressure difference transmitters 4 are equal
Access controller, temperature sensor 7 and pressure transmitter 8 access the controller, all high-temperature steam motor-driven valves 6 and compression
Air solenoid valve 5 accesses and is controlled by controller, and controller uses conventional controller, such as PLC or DCS.
Controller acquires the real time information of pressure difference transmitter, controls high-temperature steam motor-driven valve 6 according to pressure difference transmitter signal
With compressed air electromagnetic valve 5, selection steam soot blowing, sonic soot blowing or joint soot blowing are changed according to pressure difference.
The condition of steam sootblower to put into operation is 300-360 DEG C of temperature；When temperature is lower than 300 DEG C, chain steam is blown
Grey device motor-driven valve is in close state always, and Low Temperature Steam is avoided to enter system.
The method of operation of the invention:
Under nominal situation: acoustic wave ash ejector is that the mode supplemented by leading, steam sootblower is run.One acoustic wave ash ejector
In purge cycles, acoustic wave ash ejector from top to bottom successively starts, and single sound wave purge time is 3s, and interval time is 10 seconds, sound
Wave soot blower purge cycles are 30-60min, and steam sootblower is as spare；
Every layer of catalyst is configured with differential pressure transmitter, and when any one layer of catalyst differential pressure > 300Pa, control system adds automatically
The starting frequency of close acoustic wave ash ejector, purge cycles are adjusted to 20min, until all catalyst differential pressure < 300Pa；If sound
After wave soot blower starts encipheror, catalyst differential pressure is more than that 300Pa continues 2h, is considered as unusual service condition, system will start automatically
Especially purging program, acoustic wave ash ejector and steam sootblower alternate run, specifically: first layer catalyst acoustic wave ash ejector opens
It is dynamic, the starting operation of first layer steam sootblower；The starting operation of second layer acoustic wave ash ejector, second layer steam sootblower starting fortune
Row, and so on, until the acoustic wave ash ejector and steam sootblower of lowest level catalyst successively start end of run.It is possible thereby to
The good result of acquirement is: each layer of catalyst top, can be with by steam sootblower after acoustic wave ash ejector effect vibration is loose
Conducive to the thorough cleaning of dust.
Embodiment 1
Cement furnace SCR equipment for denitrifying flue gas is arranged in C1 grades of cyclone preheater downstreams (i.e. high dirt arrangement), into SCR
The exhaust gas volumn of reactor is 10000Nm3/ h, dust concentration 60-80g/m3, temperature is 300-340 DEG C, and SCR reactor is vertical cloth
It sets, the catalyst that is of five storeys is set altogether.Every layer of catalyst top is configured with steam sootblower, and steam, which draws, is connected to waste heat boiler, steam temperature
340 DEG C of degree, each acoustic wave ash ejector gas source is controlled by motor-driven valve, and rake steam sootblower purge hole is apart from catalyst upper surface
400mm.Rake soot blower top is disposed with acoustic wave ash ejector, and acoustic wave ash ejector horn mouth center line is apart from catalyst upper surface
750mm, acoustic wave ash ejector gas source are compressed air, and by solenoid valve control, compressed air pressure is not less than 0.6MPa.
SCR reactor bottom is provided with ash bucket, is the square section of square top and round bottom, and a circle purging pipeline is laid on the inside of ash bucket,
It is smooth not only to have can guarantee that scavenging conduit said air-flow for conduit upper L-type steel, but also is avoided that dust blocks purge hole.
Matched soot blowing program has；
Nominal situation soot blowing program, running order are specific as follows:
First layer acoustic wave ash ejector correspond to pneumatic operated valve open → first layer acoustic wave ash ejector work → first layer pneumatic operated valve is automatic
It closes
→ second layer acoustic wave ash ejector correspond to pneumatic operated valve open → second layer acoustic wave ash ejector work → second layer pneumatic operated valve from
It is dynamic to close
→ third layer acoustic wave ash ejector correspond to pneumatic operated valve open → third layer acoustic wave ash ejector work → third layer pneumatic operated valve from
It is dynamic to close
→ the four layer of acoustic wave ash ejector corresponds to pneumatic operated valve and opens → the four layer of pneumatic operated valve of → the four layer of acoustic wave ash ejector work certainly
It is dynamic to close
→ layer 5 acoustic wave ash ejector correspond to pneumatic operated valve open → layer 5 acoustic wave ash ejector work → layer 5 pneumatic operated valve from
It is dynamic to close
Unusual service condition soot blowing program is that running order is specific as follows:
First layer: first layer acoustic wave ash ejector pneumatic operated valve opens → first layer acoustic wave ash ejector work → first layer sonic soot blowing
Automatically pass → first layer steam sootblower valve opens → first layer steam sootblower advance → first layer steam sootblower to device pneumatic operated valve
Be delayed 1min for retrogressing → first layer steam sootblower valve closes →
→ the second layer: each component start and stop program, duration, the same first layer of action delay
→ third layer: each component start and stop program, duration, the same first layer of action delay
→ the four layer: each component start and stop program, duration, the same first layer of action delay
→ layer 5: each component start and stop program, duration, the same first layer of action delay
When only opening steam sootblower, after debugging, best purge cycles are 1.5h, and resulting system energy consumption is about
2.64 steaming ton/day.
When only opening acoustic wave ash ejector, after debugging, best purge cycles are 20min, and still, after continuing 6h, system is held
Continuous superpressure (first layer catalyst > 300Pa), denitration efficiency decline, exit NOx concentration persistently rises, and eventually leads to catalyst
Blocking, it is necessary to which shutdown system carries out deashing.
Put into joint soot blowing technology after, every 6-8h system can start automatically unusual service condition purge program, system run all right,
The steam sootblower starting frequency declines to a great extent, and high-temperature steam consumption saves 75%.
Three kinds of situation Contrast on effect analyses such as table 1:
Table 1
The foregoing is merely the specific implementation cases of the invention patent, but the technical characteristic of the invention patent is not limited to
This, within the field of the present invention, made changes or modifications all cover of the invention special any those skilled in the relevant art
Among sharp range.
Claims (10)
1. a kind of SCR denitration device for combining soot blowing, including SCR reactor, the SCR reactor head setting gas inlet,
Bottom setting exhanst gas outlet, inside set gradually several layers catalyst bed along flue gas flow direction, which is characterized in that every layer of catalyst
The top of bed sets gradually steam sootblower and acoustic wave ash ejector against flue gas flow direction；Between the upper and lower of every layer of catalyst bed
Pressure difference transmitter is set；External high-temperature steam gas source after all steam sootblowers are in parallel is respectively provided with high temperature steaming on each parallel pipeline
Temperature sensor is arranged on general pipeline in vapour motor-driven valve；External compressed air gas source after all sonic sensors are in parallel, each parallel transistor
Compressed air motor-driven valve is arranged in road, and pressure transmitter is arranged on general pipeline；
It further include controller, the temperature sensor, pressure transmitter and all pressure difference transmitters access the control
Device, all high steam motor-driven valves and compressed air motor-driven valve access and are controlled by the controller.
2. SCR denitration device according to claim 1, which is characterized in that the steam nozzle hole distance of the steam sootblower
Corresponding catalyst bed upper surface 350-450mm；The corresponding catalyst bed upper surface of center line distance of the acoustic wave ash ejector
750-800mm。
3. SCR denitration device according to claim 1, which is characterized in that the high-temperature steam gas source, which draws, is connected to waste heat boiler.
4. SCR denitration device according to claim 1, which is characterized in that ash bucket, ash is arranged in the bottom of the SCR reactor
Ash bucket scavenging conduit is arranged in headwall face；The ash bucket scavenging conduit is parallel to the setting of ash bucket wall surface, opens up purge hole on the scavenging conduit,
The purge hole is towards ash bucket wall surface and purging direction is perpendicular to ash bucket wall surface.
5. SCR denitration device according to claim 1, which is characterized in that the steam sootblower includes:
The rake structure for protruding into inside reactor including a main pipe and is provided in main pipe and opening vertically downwards several
Aperture, the external high-temperature steam gas source of main pipe；
It is fixed on SCR reactor interior plate and is located at the horizontal shore at main pipe both ends, the both ends of the main pipe are placed in
And it can opposite sliding on corresponding horizontal shore；
And the executing agency outside SCR reactor, drive the rake structure to slide along horizontal shore.
6. a kind of SCR denitration method for carrying out joint soot blowing using SCR denitration device as described in claim 1, flue gas is by cigarette
Gas import enters in SCR reactor, at smoke inlet spray ammonium hydroxide, flue gas successively by several layers catalyst bed purification after by
The particulate matter that exhanst gas outlet discharge reaction process corresponds to catalyst bed upper surface is purged, which is characterized in that the purging
Process it is as follows:
Under nominal situation, starting acoustic wave ash ejector purging, steam sootblower is spare, in an acoustic wave ash ejector purge cycles, sound
Wave soot blower from top to bottom successively starts；As the catalyst pressure difference > 300Pa that any pressure difference transmitter detects, controller is certainly
The starting frequency of dynamic encryption acoustic wave ash ejector, until the equal < 300Pa of catalyst differential pressure that all pressure difference transmitters detect；
If catalyst differential pressure is more than that 300Pa continues 2h, is considered as unusual service condition after acoustic wave ash ejector starts encipheror；Abnormal work
Under condition: acoustic wave ash ejector and steam sootblower alternate run.
7. method according to claim 6, which is characterized in that the program of alternate run are as follows: the starting of first layer acoustic wave ash ejector,
The starting operation of first layer steam sootblower；The starting operation of second layer acoustic wave ash ejector, the starting operation of second layer steam sootblower, according to
It is secondary to analogize, until the acoustic wave ash ejector and steam sootblower of lowest level catalyst successively start end of run.
8. method according to claim 6, which is characterized in that when temperature sensor monitors gas source temperature lower than 300 DEG C,
Chain steam sootblower motor-driven valve is in close state always.
9. method according to claim 6, which is characterized in that under nominal situation, in the purge cycles of an acoustic wave ash ejector,
Single sound wave purge time is 2~4s, and interval time is 10~15 seconds；Purge cycles are 30-60min.
10. method according to claim 6, which is characterized in that under acoustic wave ash ejector encipheror, purge cycles be 18~
22min。
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