CN109046023A - A kind of SCR reactor soot blower system and method - Google Patents
A kind of SCR reactor soot blower system and method Download PDFInfo
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- CN109046023A CN109046023A CN201810764374.9A CN201810764374A CN109046023A CN 109046023 A CN109046023 A CN 109046023A CN 201810764374 A CN201810764374 A CN 201810764374A CN 109046023 A CN109046023 A CN 109046023A
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- pressure
- compressed air
- soot
- air
- scr reactor
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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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
Abstract
The invention proposes a kind of SCR reactor soot blower system and the ash-blowing methods realized by this system, belong to boat diesel engine exhaust aftertreatment technical field.Soot blower system is using compressed air as purge gas in the present invention, including air bottle, pressure-reduction module, control module, rotary pressure pulse converter, rotary power unit and soot blowing pipeline.When SCR reactor inlet and outlet flue gas pressures are more than setting value, the controller of soot blower system automatically turns on dust stratification purging, compressed air in air bottle is delivered to above rotary pressure pulse converter by pressure reducer, rotary pressure pulse converter can be by rotating the purging air for making soot blowing pipeline generate different pressures at any time, strong turbulence disturbance is formed in catalyst surface, promotes purging effect.Soot blowing pipeline connection and reasonable arrangement of the invention can effectively avoid generating secondary dust stratification, while soot blowing hole is located at blowing pipe road, and the structure in soot blowing hole is simple, convenient for the maintenance in later period.
Description
Technical field
The invention belongs to boat diesel engine exhaust aftertreatment technical fields, and in particular to a kind of SCR reactor soot blower system
And the ash-blowing method realized by this system.
Background technique
SCR technology is current widely used ship denitration technology.Marine diesel uses poor quality fuel oil, in diesel oil
Contain a large amount of dust in the exhaust gas of machine.In addition, into a small amount of urea crystals and sulfuric acid are contained in the flue gas of SCR reactor
The ingredients such as salt, ash-deposition can reduce effective catalysis area of catalyst, largely effect on SCR on SCR reactor catalyst surface
The denitration performance of system.Lot of domestic and international researcher studies the soot blower of SCR system, but SCR reactor
Soot blower system still have problem, cause the performance of SCR reactor to decline.
Application spray is proposed in " soot blower for SCR denitration reaction device " that number of patent application is 201310409471.3
Gas pipe network unit module carries out dust stratification purging to SCR system, the jet soot blowing of air jet pipe net unit module in the set soot blower
Fumarole is more on branch pipe, needs a large amount of compressed air to guarantee the operation of system, causes air compressor machine frequent start-stop, expends big
The energy of amount.In addition, to be distributed in the soot blowing branch pipe between smoke inlet and catalyst more for the invention, under the pressure for causing flue gas
Drop is mutually put up a bridge between the dust stratification on the surface of jet soot blowing branch pipe, forms new dust stratification area simultaneously because the long-term work of system
Domain influences the normal work of SCR reactor.
One kind is proposed in " a kind of soot blower system for SCR reactor " that number of patent application is 201611230660.4
Same air bottle connects the soot blower of the soot blowing pipeline of different catalyst layers.There is more air bottle point in the invention
Cloth considerably increases space occupancy rate of the soot blower system in SCR reactor.In addition, solenoid valve more involved in the system
Door, largely reduces the reliability of SCR reactor, increases SCR reactor operation and maintenance difficulty.
For synthesis, there are air consumptions for existing SCR reactor greatly, it is complicated, easy to form to purge low efficiency, scavenging pipeline
The problems such as new dust stratification region, exploitation design it is a set of it is economical, efficiently, the simple SCR reactor soot blower system of operation and maintenance be to have
It is necessary, it is realized in view of the deficiencies of the prior art the invention proposes a kind of SCR reactor soot blower system and by this system
Ash-blowing method.
Summary of the invention
The purpose of the present invention is to provide a kind of structures simply, facilitates operation and favorable working performance, high-efficient SCR reaction
Device soot blower system and the ash-blowing method realized by this system.
The object of the present invention is achieved like this:
The invention proposes a kind of SCR reactor soot blower systems, including air bottle 1, pressure-reduction module, control module 4, rotation
Formula pressure pulse converter 5, rotating electric machine 6, smoke inlet pressure sensor 7, exhanst gas outlet pressure sensor 8 and soot blowing pipeline
9, wherein pressure-reduction module includes compressed air electromagnetic valve 2 and compressed air pressure reducing valve 3 again；
Soot blowing pipeline 9 is located in SCR reactor, and both ends are separately installed with smoke inlet pressure sensor 7 and exhanst gas outlet
Pressure sensor 8；Rotary pressure pulse converter 5 is installed on the top of soot blowing pipeline 9, rotating electric machine 6 and rotary pressure
Pulse converter 5 is connected；Compressed air is stored in air bottle 1, air bottle 1 passes through pressure-reduction module and rotary pressure pulse
Converter 5 is connected.
For a kind of SCR reactor soot blower system, the rotary pressure pulse converter 5 includes flange 5-1, rotation
Impulse generator 5-2 and discouraged slot 5-3, wherein rotating pulse generator 5-2 includes 3 groups of air pipelines, every group of air pipeline packet
Pressure reducing valve 5-4, compressed air inlet pipe road 5-5 and compressed air outlet pipe 5-6, pressure reducing valve 5-4 are included by compressed air air inlet
Pipeline 5-5 is connected with compressed air outlet pipe 5-6, the compressed air inlet pipe road top 5-5 and compressed air escape pipe
The road lower part 5-6 passes through flange 5-1 respectively and is fixed, and discouraged slot 5-3 is uniformly provided on flange 5-1.
Preferably, between every group of 3 groups of air pipelines in the rotating pulse generator 5-2 mutually be in 120 ° of angles, every group
The pressure relief value of the pressure reducing valve 5-4 of middle installation is different.
Preferably, soot blowing spray orifice 9-1 is provided on the duct wall of intersecting plane at equal intervals in the soot blowing pipeline 9, often
There are two soot blowing spray orifice 9-1 in one plane, and the angle between two soot blowing spray orifice 9-1 is 40 ° -- 60 °, such as 40 °, 45 °, 50 °,
55°,60°；The diameter of soot blowing spray orifice 9-1 is not more than 2mm.
It include M group rotary pressure pulse converter 5, SCR in soot blower system for a kind of SCR reactor soot blower system
It include M group soot blowing pipeline 9 in reactor, wherein the size of M is determined according to the width of SCR reactor；Soot blowing pipeline 9 is by equal intervals
It is separated into N number of intersecting plane, wherein the size of N is determined according to the sectional area size of SCR reactor.
The invention also provides a kind of SCR reactor ash-blowing methods, are realized by following steps:
(1) system is initialized, control module opens smoke inlet pressure sensor and exhanst gas outlet pressure sensor, acquisition
The pressure difference of SCR reactor inlet and outlet；
(2) collected magnitude of pressure differential is compared by control module with preset pressure, if acquisition pressure difference is more than default pressure
Difference, control module open soot blowing mode；
(3) compressed air electromagnetic valve is opened, and is stored in the compressed air in air bottle by compressed air electromagnetic valve, is being subtracted
Compressed air is depressurized to rated pressure in depressor, and the compressed air by decompression is transported to rotary pressure pulses switch
Device；
(4) compressed air enters from the top of rotary pressure pulse converter, by the mounting flange on top, into rotation
Turn impulse generator, different pipelines depressurize under the action of different vacuum device as different purging pressure；
(5) the soot blowing pipeline of SCR inside reactor is entered from the compressed air that rotary pressure pulse converter is discharged,
Compressed air is discharged from the soot blowing hole of blowing pipe road, by the variable compressed air of pressure to the dust stratification on SCR catalyst surface
It is purged.
For a kind of SCR reactor ash-blowing method, in the step (4) under the control of control module, at interval of one
Fixed time, pulse converter rotate 120 ° along constant direction, and circulation converts air pipeline, every air before making soot blowing pipeline
Pipeline generates the compressed air of different purging pressure in different time, three for realizing the outlet of rotary pressure pulse converter
The variation of air line pressure rule.
The beneficial effects of the present invention are:
In the present invention soot blowing pipeline of soot blower system inside reactor be in simple longitudinal arrangement, and soot blowing pipeline compared with
Carefully, it can be effectively reduced pressure drop of the flue gas in SCR reactor.
It is in 50 ° or so of angle between two soot blowing spray orifices of blowing pipe road sustained height, can guarantees less
There is preferable purging effect under the premise of specific air consumption.
Blowing pipe road negligible amounts before every layer of catalyst can effectively avoid dust stratification from being formed on blowing pipe road and take
Bridge, to avoid secondary dust stratification.
Rotary pressure pulse converter can be realized be distributed in every layer soot blowing pipeline blowing pressure timing rule
Variation, to make compressed air form stronger air turbulence disturbance in SCR catalyst front end, to promote purging effect.
The soot blowing spray orifice of blowing pipe road is the simple aperture on pipeline in the present invention, and structure is simple, it is not easy to generate event
Barrier, can be effectively reduced the difficulty of system operation and maintenance.
The pressure difference that the control system of soot blower system is imported and exported by identifying flue gas in SCR reactor, so as to control automatically
The start and stop of soot blower system processed.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of SCR reactor soot blower system in the present invention；
Fig. 2 is rotary pressure pulse converter structural schematic diagram in the present invention；
Fig. 3 is soot blowing pipeline structure schematic diagram in the present invention.
Specific embodiment
The present invention is described further with reference to the accompanying drawing.
In conjunction with Fig. 1 to Fig. 3, the invention proposes a kind of SCR reactor soot blower systems, mainly by air bottle, depressurized system,
Control system, rotary pressure pulse converter, power device composition.SCR reactor soot blower system proposed by the invention
Soot blowing pipeline is the stainless steel pipeline in the soot blowing hole with queueing discipline, is generated using rotary pressure pulse converter variable
The compressed air of pressure purges the dust stratification on SCR reactor catalyst surface.
When SCR reactor inlet and larger outlet pressure difference, the control system 4 of soot blower system can automatically turn on dust stratification purging
Mode.Compressed air electromagnetic valve 2 is opened, and the compressed air in air bottle 1 will be pressed by compressed air electromagnetic valve and pressure reducer 3
Power is down to about 15bar or so.
Compressed air after decompression and be sent to respectively No.1, No. two, in No. three rotary pressure pulse converters 5, often
A rotary pressure pulse converter has mutually respectively in three air inlet compressed air lines of 120 ° of angles and three exhaust compressions
Air pipe line, three gas exhaust pipings are evenly distributed on the front of catalyst, the core component of revolving pressure pulse converter
For the rotating pulse generator 5-2 in Fig. 2, three root canal roads of rotating pulse generator are respectively provided with the pressure reducing valve of different vacuum value
5-4, rotating electric machine 6 drives rotating pulse generator rotation according to certain rule under the action of control system, to make to revolve
The pressure value on three root canal roads of rotatable pressure pulse transducer outlet changes over time, to guarantee to be located at three before catalyst
The pressure value of compressed air line is in variable condition, to form stronger turbulence intensity, tubulence energy is rationally utilized, and guarantees
The working performance of soot blower.
In conjunction with Fig. 2, rotating pulse generator upper flange is provided with discouraged slot 4, rotates in rotary course to ensure that
The failure of gas shutoff formation will not occur for formula pressure pulse converter.
The air being discharged from rotary pressure pulse converter enters soot blowing pipeline, and compressed air is opened by blowing pipe road
If diameter be 1.5mm or so aperture spray, to complete the purging of catalyst surface dust stratification.
The soot blowing spray orifice of blowing pipe road in the present invention arranges that four rows are used as signal, the row specifically arranged in vertical direction
Number should be according to the actual size relevant design of SCR reactor, the air pipe line cloth of rotary pressure pulse converter in the present invention
Three tunnels are set to as signal, reasonable Arrangement should be carried out according to the width of SCR reactor in practice.
The present invention also provides a kind of ash-blowing method based on SCR reactor soot blower system, specific implementation step is as follows:
(1) SCR reactor smoke inlet and exhanst gas outlet install pressure sensor, after pressure difference is more than certain value,
Control system can start SCR soot blower automatically.
(2) compressed air in air bottle is stored in by compressed air electromagnetic valve, and compressed air is subtracted in pressure reducer
It is depressed into rated pressure, the compressed air by decompression is transported to rotary pressure pulse converter.
(3) compressed air enters from the top of rotary pressure pulse converter, by the mounting flange on top, it is laggard
Enter rotating pulse generator, different pipelines depressurize under the action of different vacuum device as different purging pressure.
(4) under control of the control system per at regular intervals, pulse converter rotates 120 ° along certain direction, in fact
Three air line pressure rules variation of existing rotary pressure pulse converter outlet.
(5) the soot blowing pipeline of SCR inside reactor is entered from the compressed air that rotary pressure pulse converter is discharged,
Compressed air is discharged from the soot blowing hole of blowing pipe road, realizes the purging to catalyst surface dust stratification.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of SCR reactor soot blower system, it is characterised in that: including air bottle (1), pressure-reduction module, control module (4), rotation
Rotatable pressure pulse converter (5), rotating electric machine (6), smoke inlet pressure sensor (7), exhanst gas outlet pressure sensor (8)
With soot blowing pipeline (9), wherein pressure-reduction module includes compressed air electromagnetic valve (2) and compressed air pressure reducing valve (3) again；
Soot blowing pipeline (9) is located in SCR reactor, and both ends are separately installed with smoke inlet pressure sensor (7) and exhanst gas outlet
Pressure sensor (8)；Rotary pressure pulse converter (5) is installed on the top of soot blowing pipeline (9), rotating electric machine (6) and rotation
Rotatable pressure pulse converter (5) is connected；Store compressed air in air bottle (1), air bottle (1) by pressure-reduction module with
Rotary pressure pulse converter (5) is connected.
2. a kind of SCR reactor soot blower system according to claim 1, it is characterised in that: the rotary pressure arteries and veins
Red switch parallel operation (5) includes flange (5-1), rotating pulse generator (5-2) and discouraged slot (5-3), wherein rotating pulse generator
(5-2) includes 3 groups of air pipelines, and every group of air pipeline includes pressure reducing valve (5-4), compressed air inlet pipe road (5-5) and compression
Air outlet pipe (5-6), pressure reducing valve (5-4) connect compressed air inlet pipe road (5-5) and compressed air outlet pipe (5-6)
It picks up and, the compressed air inlet pipe road top (5-5) and the lower part compressed air outlet pipe (5-6) pass through flange (5-1) respectively
It is fixed, discouraged slot (5-3) is uniformly provided on flange (5-1).
3. a kind of SCR reactor soot blower system according to claim 2, it is characterised in that: the rotary pulsed generation
It is mutually in 120 ° of angles between every group of 3 groups of air pipelines in device (5-2), the pressure relief value for the pressure reducing valve (5-4) installed in every group is different.
4. a kind of SCR reactor soot blower system according to claim 1, it is characterised in that: in the soot blowing pipeline (9)
It being provided on the duct wall of intersecting plane at equal intervals soot blowing spray orifice (9-1), there are two the soot blowing spray orifices (9-1) in each plane,
Angle between two soot blowing spray orifices (9-1) is 40 ° -- 60 °, such as 40 °, 45 °, 50 °, 55 °, 60 °；The diameter of soot blowing spray orifice (9-1) is not
Greater than 2mm.
5. a kind of SCR reactor soot blower system according to claim 1, it is characterised in that: include that M group is revolved in soot blower system
Rotatable pressure pulse converter (5) includes M group soot blowing pipeline (9) in SCR reactor, and wherein the size of M is according to SCR reactor
Width determine；Soot blowing pipeline (9) by N number of intersecting plane is separated at equal intervals, wherein the size of N according to SCR reactor cut
Size determines.
6. a kind of SCR reactor ash-blowing method, which is characterized in that realized by following steps:
(1) system is initialized, control module opens smoke inlet pressure sensor and exhanst gas outlet pressure sensor, acquires SCR
The pressure difference of reactor inlet and outlet；
(2) collected magnitude of pressure differential is compared by control module with preset pressure, if acquisition pressure difference is more than preset pressure, control
Molding block opens soot blowing mode；
(3) compressed air electromagnetic valve is opened, and is stored in the compressed air in air bottle by compressed air electromagnetic valve, in pressure reducer
Middle compressed air is depressurized to rated pressure, and the compressed air by decompression is transported to rotary pressure pulse converter；
(4) compressed air enters from the top of rotary pressure pulse converter, by the mounting flange on top, into rotation arteries and veins
Generator is rushed, different pipelines depressurize under the action of different vacuum device as different purging pressure；
(5) the soot blowing pipeline of SCR inside reactor, compression are entered from the compressed air that rotary pressure pulse converter is discharged
Air is discharged from the soot blowing hole of blowing pipe road, and the compressed air that can be changed by pressure carries out the dust stratification on SCR catalyst surface
Purging.
7. a kind of SCR reactor ash-blowing method according to claim 6, it is characterised in that: controlled in the step (4)
Under the control of molding block, at interval of the regular hour, pulse converter rotates 120 ° along constant direction, circulation conversion air hose
Road, every air pipe line before making soot blowing pipeline generate the compressed air of different purging pressure in different time, realize rotation
Three air line pressure rules of formula pressure pulse transducer outlet change.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810764374.9A CN109046023B (en) | 2018-07-12 | 2018-07-12 | SCR reactor soot blowing system and method |
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|---|---|---|---|
| CN201810764374.9A CN109046023B (en) | 2018-07-12 | 2018-07-12 | SCR reactor soot blowing system and method |
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| CN109046023B CN109046023B (en) | 2020-12-22 |
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| CN109989806A (en) * | 2019-03-04 | 2019-07-09 | 中国船舶重工集团公司第七一一研究所 | Diesel engine high-pressure SCR ventilation voltage-stabilizing system |
| CN112746889A (en) * | 2019-10-29 | 2021-05-04 | 中船海洋动力部件有限公司 | Assembling method for vertical SCR reactor of marine diesel engine |
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| CN109046023B (en) | 2020-12-22 |
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