CN109701382A - A kind of dispersion of ultrafine powder and spraying system and its processing method and purposes - Google Patents
A kind of dispersion of ultrafine powder and spraying system and its processing method and purposes Download PDFInfo
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Abstract
The present invention provides a kind of dispersion of ultrafine powder and spraying system and its processing methods and purposes, and the system comprises powder fluidization device, high pressure draught dispersal device, electrostatic dispersion device and powder output devices；Wherein, powder fluidization device side wall is equipped with superfine powder feed inlet, and powder fluidization bottom of device is equipped with gas access, is equipped with material outlet at the top of powder fluidization device, material outlet is connected with the material inlet of high pressure draught dispersal device；The material outlet of high pressure draught dispersal device is connected with the material inlet of electrostatic dispersion device, the material outlet of electrostatic dispersion device and the material outlet of powder output device.The present invention combines four kinds of dispersion technologies such as drying, more granularity fluidizations, high-speed flow and electrostatic, realizes the fully dispersed of superfine powder.
Description
Technical field
The invention belongs to powder dispersion technology field, it is related to a kind of dispersion of ultrafine powder and spraying system and its processing method
And purposes more particularly to a kind of superfine composite additive and/or super-fine limestone powder for processes such as desulphurization and denitration or demercurations
Dispersion and spraying system and its processing method and purposes.
Background technique
Traditional furnace sorbent injection desulfurization technique be use pneumatic conveying mode added into furnace cheap calcium-based desulfurizing agent (with
Based on lime stone) desulfurization method, compared to tail flue gas desulfurization outside furnace (wet process or semidry method), furnace sorbent injection desulfurization technique tool
Have few occupied area, initial cost and operating cost it is low, not water consumption, without advantages, the desulfuration in furnace effect such as byproduct and system be simple
Rate is up to 40% (coal-powder boiler) or 90% (circulating fluidized bed boiler).
Furnace sorbent injection desulfurization process system is usually by lime stone feed and transportation system, gasification system and compressed air system
Composition.Agstone enters limestone powder bin by upper tube cell by tank car, air-dries dry and fluidisation through electric heater heating and gasifying
Afterwards, surge bunker is uniformly delivered into through electric feeder, then is measured by surge bunker through frequency conversion batcher and is sent into injector, lime stone
Powder is carried along into pulverized coal feed pipe by the high-pressure blast that roots blower provides in injector, sprays into burner hearth from secondary air channel, thus real
Existing desulfuration in furnace.As CN 105817136A discloses a kind of desulphurization in circulating fluidized bed boiler system.
One of an important factor for limestone granularity is influence desulfuration efficiency.In previous in-furnace calcium spraying engineering practice, lead to
It is often used the microlith limestone flour of -200 mesh (- 74 microns)；Although a large amount of engineering practices show the limestone particle of -200 mesh through forging
Specific surface area is larger after burning, has more flourishing microcellular structure, and reactivity is higher, however it is pressed from both sides rapidly after spraying into burner hearth
Band rises, and from the escape of recirculating fluidized bed whirlwind separator (separator separation critical grain size is generally 70 μm~100 μm), thus
Cause SO in agstone and flue gas2Time of contact is too short, not only SO2Removal efficiency is low, and causes remnants CaO mistake in flying dust
Amount reduces flying dust quality.
For superfine composite additive injection desulfurization, theoretical research shows to reduce with desulfurizing agent size, and direct desulfurization is anti-
Should the stage gradually be controlled to Control of chemical reaction step transition from product layer.Under the conditions of reaction controlling, desulfurizing agent micropore is unimpeded,
Reaction activity is very low, SO2On desulfurizing agent surface and internal fast reaction simultaneously, therefore high-efficiency desulfurization may be implemented.Using super
Thin desulfurizing agent desulfurization, since reaction speed is fast, the required reaction time is short, it is only necessary to which high-degree of conversion can be realized in the several seconds.
Superfine powder compound additive refers generally to partial size less than 10 microns, has and the oxysulfide in flue gas, nitrogen oxidation
Object and mercury etc. are chemically reacted, physically and/or chemically absorption etc., to realize the solid or liquid for reducing these pollutant emissions
Body substance.Superfine powder compound additive is since its granularity is small, uniform quality, compared with conventional desulfurizing agent, has good table
Face performance, and with a series of excellent electrical, magnetic, optical properties and the macroscopic propertieies such as mechanics and chemistry.However, in air
In, sub-micron-powder easily generates spontaneous coalescence, and strong agglomerate characteristic is shown, the second particle of larger granularity is generated,
Its dispersibility and rheological characteristic are deteriorated, and cause it to prepare, are classified, mixing and the processing factories such as storage and transportation can not be normally carried out, to drop
The low performance of material, this is insurmountable problem always in world wide.
The aerial agglomerate of powder mainly has following several respects reason:
(1) particle agglomeration caused by intermolecular force.
Existing Fan Dehuashi gravitation can cause particle agglomeration between molecule, and directly proportional to particle diameter.
(2) agglomerate caused by electrostatic force between particle.
Powder can be charged due to following three kinds of approach bands in dry air: 1. particle is charged in its production process, such as exists
Particle abutment surface is charged by friction during dry grinding；2. contacting with charged surface can make particle contact charged；3. gas ion
Diffusion make particle charge, gas ion can be made by the ionization of corona discharge, radioactive ray, ultra rays, photo-ionisation and flame
With generation.
(3) bonding of the particle in humid air causes agglomerate.
Due to the difference of vapour pressure and the effects in the particle surface unsaturation field of force in humid air, particle be intended to or it is more or
A certain amount of water vapour is condensed or adsorbed less, is formed on its surface moisture film.The hydrophilicrty and sky of water film thickness and particle surface
The humidity of gas is related.Hydrophily is stronger, and humidity is bigger, and moisture film is thicker.When relative air humidity is more than 65%, vapor starts
Cohesive force is greatly strengthened because forming liquid bridge between particle surface and interparticle coagulation, particle.
The research work of domestic and foreign scholars is not enough to grain of having reunited it has been shown that only rely on single dispersion technology
Son dispersion.Therefore, superfine composite additive existing easy agglomerate coalescence during desulphurization and denitration or demercuration etc. how is solved
The problem of, and improve the problem of removal efficiency is urgent need to resolve.
Summary of the invention
Two are easy for existing ultrathin composite powder and/or additive are existing during desulphurization and denitration or demercuration etc.
The problems such as the problem of secondary agglomerate coalescence and removal effect are to be improved, the present invention provides a kind of dispersion of ultrafine powder and sprays
Penetrate system and its processing method and purposes.Four kinds of dispersions such as the present invention will dry, more granularity fluidizations, high-speed flow and electrostatic
Technology combines, and realizes the fully dispersed of superfine powder.
To achieve this purpose, the present invention adopts the following technical scheme:
In a first aspect, the present invention provides a kind of dispersion of ultrafine powder and spraying systems, which is characterized in that the system packet
Include powder fluidization device, high pressure draught dispersal device, electrostatic dispersion device and powder output device；Wherein, powder fluidization device
Side wall is equipped with superfine powder feed inlet, and powder fluidization bottom of device is equipped with gas access, is equipped with material at the top of powder fluidization device
Outlet, material outlet are connected with the material inlet of high pressure draught dispersal device；The material outlet of high pressure draught dispersal device with it is quiet
The material inlet of electrodispersion device is connected, the material outlet of electrostatic dispersion device and the material outlet of powder output device.
Dispersion of ultrafine powder and spraying system of the present invention are suitable for superfine composite additive and/or ultra-fine limestone
The superfine powders such as powder are for processes such as desulphurization and denitration or demercurations.It is suitable for the furnaces of various solids, liquid or gas combustion apparatus
The injection of additive interior and in tail flue gas pipeline is further suitable for coal-burning boiler or circulating fluidized bed boiler etc.
Desulphurization and denitration or demercuration etc..
In the present invention, " high pressure " in the high pressure draught dispersal device be finger pressure be 80kPa~100kPa, such as
80kPa, 83kPa, 85kPa, 87kPa, 90kPa, 93kPa, 95kPa, 97kPa or 100kPa etc., it is not limited to cited
Numerical value, other unlisted numerical value are equally applicable in the numberical range.
Reunite since the sub-micron-powder of dispersion easily generates secondary coalescence in process of air delivery, thus the present invention
The system, which will pass through, to be dried, more granularity fluidizations, high pressure draught disperses and a variety of dispersion technologies such as electrostatic combine, and realize
Superfine powder it is fully dispersed.
The present invention uses multicomponent and/or more partial size fluidization technologies, using stream of relatively coarse particles, to superfine powder powder
It is dried, the control of primarily broken and feed rate.
The present invention carries out twice dispersing to superfine powder using high pressure draught dispersion technology, is carried out using pressure-air to it
Constantly dry, loosening, to reduce the liquid bridge power between powder granule, while increasing its mobility；Meanwhile it is heated after high pressure gas
Stream can heat powder, enter charge device jointly with powder, so that powder granule is carried upper a large amount of electrostatic charges, utilize lotus
Electrostatic repulsion between electric particle prevents intergranular mutual reunion, prevent dispersion powder agglomerate again occurs entering stokehold, make
Its dispersity for being in substantially uniformity has optimum activity state, is finally sprayed by the powder output device of front end.Herein
In the process, allowing powder granule charged to greatest extent is the key that realize powder dispersion, anti-agglomeration.
It is used as currently preferred technical solution below, but not as the limitation of technical solution provided by the invention, passes through
Following technical scheme can preferably reach and realize technical purpose and beneficial effect of the invention.
As currently preferred technical solution, 10 μm of the average grain diameter < of the superfine powder, such as 9 μm, 8 μm, 7 μ
M, 6 μm, 5 μm, 4 μm, 3 μm, 2 μm or 1 μm etc., it is not limited to cited numerical value, other are unlisted in the numberical range
Numerical value it is equally applicable.
Preferably, the superfine powder feed inlet connects superfine powder feeding device.
Preferably, the superfine powder feeding device includes superfine powder storage tank and feeding material component, and storage tank passes through feeding group
Part is connect with superfine powder feed inlet.
Preferably, the feeding material component includes screw delivery pump and/or chain transfer, it is not limited to cited
The feeding material component that material is sent into powder fluidization device is used equally for system described herein as long as can satisfy by feeding material component
System.
In the present invention, the screw conveyor is a kind of using motor drive spiral revolution, elapses material to realize conveying
The machinery of purpose.It can horizontal, inclination or vertical transport, have structure is simple, cross-sectional area is small, good airproof performance, it is easy to operate,
The advantages that maintenance is easy and is convenient for enclosed conveying.When material is added in the fixed trough of screw conveyor, due to the weight of material
Power and its frictional force effect between trough, the material for being deposited in trough lower part are not rotated with conveyor screw, and only in the spiral shell of rotation
Vane piece pushes lower forward movement, as non-rotary nut makees translational motion along the screw rod of rotation, reaches conveying object
The purpose of material.The machine charges convenient for multiple spot and discharging, can be completed at the same time mixing, agitating function in transmission process.
Preferably, the powder fluidization device includes fluidized bed, and gas, by fluidized bed bed, is driven with higher flow velocity
Motion of solid particle in bed, and there is the device of similar fluid flow characteristics.Feature is that gas and solid contact are quite abundant,
Big three or four times of the gas velocity of airflow velocity ratio fixed bed or more, using multicomponent or more partial size fluidization technologies, using compared with coarse granule
Fluidisation and cloth wind, are dried superfine powder compound additive, the control of primarily broken and feed rate.
As currently preferred technical solution, the high pressure draught dispersal device includes gas pipeline, gas pipeline end
End setting high pressure gas nozzle, to carry out high pressure draught impact point to the material generated from powder fluidization device using high pressure draught
It dissipates, the injection pressure of the high pressure gas nozzle is 80kPa~100kPa.
Preferably, the system also includes gas heat drying device, the gas vents of the gas heat drying device
It is connected with the gas pipeline entrance of the gas access of powder fluidization device and high pressure draught dispersal device.
Preferably, the gas pipeline entrance of the gas vent of the gas heat drying device and high pressure draught dispersal device
Between be arranged pressure conveying assembly.
Preferably, the pressure conveying assembly includes high pressure blower, and discharge pressure is 80kPa~100kPa, such as
80kPa, 83kPa, 85kPa, 87kPa, 90kPa, 93kPa, 95kPa, 97kPa or 100kPa etc., it is not limited to cited
Numerical value, other unlisted numerical value are equally applicable in the numberical range.
As currently preferred technical solution, the electrostatic dispersion device includes charged needle, charged needle rack, insulation
Pipe, ground loop and power supply, wherein charged needle and charged needle rack are placed in insulation tube, and charged needle and charged needle rack are vertically simultaneously
It is connected, charged needle rack is fixed in insulation tube, and ground loop is connected around insulation tube, power supply is surrounded with charged needle rack.
In the present invention, the charged needle and charged needle rack of the charge device are mounted in insulation tube, and charged needle passes through branch
Frame is connected with power supply, and power supply, charged needle and ground loop form a stronger corona field, when making powder granule by the insulation tube
Due to the charged effect of electrostatic field, keep powder charged to greatest extent, so that there are biggish coulomb repulsion power between making particle.
As currently preferred technical solution, the powder output device includes Laval nozzle, before the jet pipe
Half portion is that narrow larynx changes from small to big again later expands outwardly to arrow bottom from large to small to middle shrinkage to a narrow larynx.In rocket body
Gas is flowed into the first half of jet pipe by high pressure, by latter half of evolution after narrow larynx.This framework can make the speed of air-flow because of spray
The variation of sectional area and change, make air-flow from subsonic speed to velocity of sound, until accelerate to supersonic speed, be a kind of raising gas flow rate,
Accelerate the dispersal device of powder hybrid perturbation.
Preferably, the powder output device connects the device of pending superfine powder, the device of pending superfine powder
For the device outside system of the present invention.
Preferably, the device of the pending superfine powder includes in the furnace of burner and in tail flue gas pipeline.
Preferably, the burner includes coal-burning boiler and/or circulating fluidized bed boiler.
As currently preferred technical solution, the system comprises superfine powder feeding device, gas heat dryings to set
Standby, powder fluidization device, high pressure draught dispersal device, electrostatic dispersion device and powder output device.
Powder fluidization device side wall is equipped with superfine powder feed inlet, and superfine powder feed inlet connects superfine powder charging dress
It sets, superfine powder feeding device includes superfine powder storage tank and feeding material component, and storage tank is fed by feeding material component and superfine powder
Mouth connection；
Powder fluidization bottom of device is equipped with gas access, and gas access connects the gas vent of gas heat drying device,
The gas vent of gas heat drying device is also connected with the gas pipeline entrance of high pressure draught dispersal device, gas heat drying
High pressure blower is set between the gas vent of equipment and the gas pipeline entrance of high pressure draught dispersal device；
Material outlet, the material inlet phase of material outlet and high pressure draught dispersal device are equipped at the top of powder fluidization device
Even, high pressure draught dispersal device includes gas pipeline, and high pressure gas nozzle is arranged in gas pipeline end；
The material outlet of high pressure draught dispersal device is connected with the material inlet of electrostatic dispersion device, electrostatic dispersion device packet
Including charged needle, charged needle rack, insulation tube, ground loop and power supply, wherein charged needle and charged needle rack are placed in insulation tube,
Charged needle is vertical with charged needle rack and is connected, and charged needle rack is fixed in insulation tube, and ground loop is around encirclement insulation tube, electricity
Source is connected with charged needle rack；
The material outlet of electrostatic dispersion device and the material outlet of powder output device, powder output device includes Lavalle
Jet pipe；
Wherein, feeding material component includes screw delivery pump and/or chain transfer.
Second aspect, the present invention provides the processing methods of above system, which comprises
Superfine powder is successively exported after fluidization, high pressure draught dispersion and electrostatic dispersion.
As currently preferred technical solution, the fluidization carries out in powder fluidization device.
Preferably, the gases used air for by heating in the fluidizing gas.
Preferably, it is described by heating air temperature be 60 DEG C~90 DEG C, such as 60 DEG C, 65 DEG C, 70 DEG C, 75 DEG C,
80 DEG C, 85 DEG C or 90 DEG C etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally suitable
With.
Preferably, flow velocity gases used in the fluidizing gas is 3m/s~5m/s, such as 3m/s, 3.5m/s, 4m/
S, 4.5m/s or 5m/s etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally suitable
With.
Preferably, the high pressure draught is dispersed in high pressure draught dispersal device and carries out.
Preferably, the pressure of high pressure draught used is 80kPa~100kPa in high pressure draught dispersion, such as 80kPa,
83kPa, 85kPa, 87kPa, 90kPa, 93kPa, 95kPa, 97kPa or 100kPa etc., it is not limited to cited numerical value,
Other unlisted numerical value are equally applicable in the numberical range.
Preferably, high pressure draught used is into the air crossed after heating in high pressure draught dispersion, and temperature is 60 DEG C
~90 DEG C, such as 60 DEG C, 65 DEG C, 70 DEG C, 75 DEG C, 80 DEG C, 85 DEG C or 90 DEG C etc., it is not limited to cited numerical value, it should
Other unlisted numerical value are equally applicable in numberical range.
Preferably, the electrostatic dispersion carries out in electrostatic dispersion device.
Preferably, power supply applied in the electrostatic dispersion is high voltage power supply, and voltage is 50kV~90kV, such as
50kV, 55kV, 60kV, 65kV, 70kV, 75kV, 80kV, 85kV or 90kV etc., it is not limited to cited numerical value, the number
It is equally applicable to be worth other unlisted numerical value in range.
Preferably, in the electrostatic dispersion electric current be 6mA~8mA, such as 6mA, 6.5mA, 7mA, 7.5mA or 8mA etc., but
It is not limited in cited numerical value, other unlisted numerical value are equally applicable in the numberical range.
Preferably, the output is carried out by powder output device.
Preferably, the powder output is sprayed using Laval nozzle.
As currently preferred technical solution, which comprises
Air of 10 μm of average grain diameter < of the superfine powder in powder fluidization device through heating is subjected to fluidization, warp
Powder after crossing fluidization is 80kPa~100kPa in pressure, is carried out under the action of the high pressure draught that temperature is 60 DEG C~90 DEG C
Good pressure distribution, powder after high pressure draught disperses carry out quiet under conditions of voltage be 50kV~90kV electric current is 6mA~8mA
Electrodispersion is sprayed by Laval nozzle after electrostatic.
The third aspect, the present invention provides the purposes of above system, the system is used in the furnace of burner and/or tail
The injection of additive in portion's flue.
Preferably, the system is in coal-burning boiler and/or circulating fluid bed boiler and/or in tail flue gas pipeline
Additive injection.
Compared with prior art, beneficial effects of the present invention are as follows:
System of the present invention using fluidization technology to superfine powder be dried with it is primarily broken, then pass through high pressure gas
Flow point dissipating bind closes electrostatic dispersion it is possible to prevente effectively from secondary coalescence of the sub-micron-powder in process of air delivery is reunited, in turn
Promote desulphurization and denitration or demercuration efficiency.
Detailed description of the invention
Fig. 1 is dispersion of ultrafine powder described in the embodiment of the present invention 1 and spraying system structural schematic diagram；
Fig. 2 is the structural schematic diagram of electrostatic dispersion device described in the embodiment of the present invention 1；
Wherein, 1- powder fluidization device, 2- high pressure draught dispersal device, 3- electrostatic dispersion device, 4- powder output device,
5- storage tank, 6- feeding material component, 7- gas heat drying device, 8- high pressure blower, the charged needle of 31-, the charged needle rack of 32-, 33- are exhausted
Edge pipe, 34- ground loop, 35- power supply.
Specific embodiment
In order to better illustrate the present invention, it is easy to understand technical solution of the present invention, below further specifically to the present invention
It is bright.But following embodiments is only simple example of the invention, does not represent or limit the scope of the present invention, this
Invention protection scope is subject to claims.
Specific embodiment of the invention part provides a kind of dispersion of ultrafine powder and spraying system and its processing method, institute
The system of stating includes powder fluidization device 1, high pressure draught dispersal device 2, electrostatic dispersion device 3 and powder output device 4；Wherein,
1 side wall of powder fluidization device is equipped with superfine powder feed inlet, and 1 bottom of powder fluidization device is equipped with gas access, powder flow makeup
It sets 1 top and is equipped with material outlet, material outlet is connected with the material inlet of high pressure draught dispersal device 2；High pressure draught dispersion dress
It sets 2 material outlet to be connected with the material inlet of electrostatic dispersion device 3, the material outlet and powder of electrostatic dispersion device 3 export
The material outlet of device 4.
The processing method of the system includes:
Superfine powder is successively exported after fluidization, high pressure draught dispersion and electrostatic dispersion.
The following are typical but non-limiting embodiments of the invention:
Embodiment 1:
Present embodiments provide a kind of dispersion of ultrafine powder for desulphurization in circulating fluidized bed boiler denitration and injection
System, as shown in Figure 1, the system comprises superfine powder feeding device, gas heat drying device 7, powder fluidization device 1,
High pressure draught dispersal device 2, electrostatic dispersion device 3 and powder output device 4；
Superfine powder feeding device includes fine powder storage tank 5 and feeding material component 6, and feeding material component 6 is screw delivery pump, feeding
Component 6 is connected with the superfine powder feed inlet that 1 side wall of powder fluidization device is equipped with；
The gas vent of gas heat drying device 7 and the gas access of 1 bottom of powder fluidization device and high pressure gas flow point
The 2 gas pipeline entrance in bulk set is connected, and the gas vent of gas heat drying device 7 and high pressure draught dispersal device 2
High pressure blower 8 is equipped between gas pipeline entrance；
Material outlet, the material inlet phase of material outlet and high pressure draught dispersal device 2 are equipped at the top of powder fluidization device 1
Even, high pressure draught dispersal device 2 includes gas pipeline, and high pressure gas nozzle is arranged in gas pipeline end；High pressure draught dispersal device
Material outlet is connected with the material inlet of electrostatic dispersion device 3, the material outlet and powder output device 4 of electrostatic dispersion device 3
Material outlet.
Wherein, powder fluidization device 1 is fluidized bed；
As shown in Fig. 2, the electrostatic dispersion device 3 includes charged needle 31, charged needle rack 32, insulation tube 33, ground loop
34 and power supply 35, wherein charged needle 31 and charged needle rack 32 are placed in insulation tube 33, and charged needle 31 and charged needle rack 32 hang down
Direct join is connected, and charged needle rack 32 is fixed in insulation tube 33, and ground loop 34 is around encirclement insulation tube 33, power supply 35 and charged needle
Bracket 32 is connected；
The powder output device 4 is Laval nozzle.
The processing method of the system the following steps are included:
(a) 10 μm of average grain diameter < of superfine composite desulfurization denitrification agent is sent by powder flow by superfine powder feeding device
Makeup is set in 1, will warm up hot-air that temperature is 80 DEG C from 1 bottom of powder fluidization device by gas heat drying device 7
It is sent into powder fluidization device 1, superfine composite desulfurization denitrification agent is dried and fluidization；
(b) the superfine composite desulfurization denitrification agent after fluidization enters high pressure draught dispersal device 2, and gas heat drying is set
It is right that the pressurized high pressure draught for being 90kPa to pressure of hot-air that standby 7 generation temperature is 80 DEG C enters high pressure draught dispersal device 2
Superfine composite desulfurization denitrification agent carries out good pressure distribution；
(c) the superfine composite desulfurization denitrification agent after good pressure distribution, which enters, carries out electrostatic dispersion in electrostatic dispersion device 3,
Middle voltage is 70kV, electric current 7mA, and the superfine composite desulfurization denitrification agent after electrostatic dispersion is sent by powder output device 4
Desulphurization denitration is carried out to flue gas in circulating fluidized bed boiler.
Superfine composite desulfurization denitrification agent is sent into circulating fluidized bed boiler and is taken off by the system through this embodiment
Sulphur denitration, the superfine composite desulfurization denitrification agent are not in secondary coalescence agglomeration, and superfine composite desulphurization denitration is in furnace
High-efficiency desulfurization denitration may be implemented in fast reaction.
Embodiment 2:
Present embodiments provide a kind of dispersion of ultrafine powder and spraying system and its processing method, the system structure reference
The structure of system, difference are only that in embodiment 1: the feeding material component 6 is chain transfer, and the system is used for coal-burning boiler
In-furnace desulfurization, denitration.
The processing method is only that referring to method in embodiment 1, difference: hot-air is heated to 60 DEG C in step (a)；
The pressure of step (b) mesohigh air-flow is 80kPa；Voltage is 50kV, electric current 6mA in step (c) electrostatic dispersion device 3.
The system through this embodiment, superfine composite desulfurization denitrification agent is not in secondary coalescence agglomeration,
High-efficiency desulfurization denitration may be implemented in fast reaction in furnace.
Embodiment 3:
Present embodiments provide a kind of dispersion of ultrafine powder and spraying system and its processing method, the system structure reference
The structure of system, difference are only that in embodiment 1: the system is used for coal-burning boiler.
The processing method is only that referring to method in embodiment 1, difference: hot-air is heated to 90 DEG C in step (a)；
The pressure of step (b) mesohigh air-flow is 100kPa；Voltage is 90kV, electric current 8mA in step (c) electrostatic dispersion device 3.
The system through this embodiment, superfine composite desulfurization denitrification agent is not in secondary coalescence agglomeration,
High-efficiency desulfurization denitration may be implemented in fast reaction in furnace.
Comparative example 1:
This comparative example provides a kind of dispersion of ultrafine powder and spraying system, and the system and its processing method are referring to CN
System and method in 105817136A.
System in comparative example 1 and comparative example 1, using system described in embodiment 1 to fire coal circulating fluid bed boiler
Interior injection superfine composite desulfurization denitrification agent, denitrification efficiency improve 15% or more compared with system in comparative example 1；Also, it adopts
It will appear serious reunion coalescence phenomenon with the system injection superfine composite additive in comparative example 1.
Comparative example 2:
This comparative example provides a kind of dispersion of ultrafine powder and spraying system, and the system structure in embodiment 1 referring to tying
Structure, difference are: it does not include powder fluidization device 1, i.e. superfine composite desulfurization denitrification agent is fluidized without gaseous state, but through high pressure point
It dissipates and sprays into progress desulphurization denitration in circulating fluidized bed boiler after electrostatic dispersion.
Comparative example 1 and comparative example 2, comparative example 2 can make due to not carrying out fluidization to superfine composite desulfurization denitrification agent
Superfine composite additive does not carry out primary dry and dispersion, and then makes denitrification efficiency compared with reducing by 5% in embodiment 1.
Comparative example 3:
This comparative example provides a kind of dispersion of ultrafine powder and spraying system, and the system structure in embodiment 1 referring to tying
Structure, difference are: not including high pressure draught dispersal device 2, i.e., superfine composite desulfurization denitrification agent is after fluidization without high pressure gas
Flow point dissipates, but directly carries out electrostatic dispersion.
Comparative example embodiment 1 and comparative example 3, comparative example 2 due to not to the superfine composite desulfurization denitrification agent after fluidization into
The dispersion of horizontal high voltage air-flow can make superfine composite additive not carry out redrying and dispersion .., and then make denitrification efficiency
Compared with reduction by 5% or so in embodiment 1.
Comparative example 4:
This comparative example provides a kind of dispersion of ultrafine powder and spraying system, and the system structure in embodiment 1 referring to tying
Structure, difference are: do not include electrostatic dispersion device 3, i.e., superfine composite desulfurization denitrification agent after fluidization and good pressure distribution after not
It is injected directly into through electrostatic dispersion in circulating fluidized bed boiler and carries out desulphurization denitration.
Comparative example embodiment 1 and comparative example 3, comparative example 2 is not due to de- to the superfine composite desulfurization after high pressure draught dispersion
Nitre agent carries out electrostatic dispersion, and superfine composite additive fine powder can be made to reunite again, and then makes denitrification efficiency compared with dropping in embodiment 1
Low 5%-10%.
System of the present invention be can be seen that with comparative example based on the above embodiments using fluidization technology to superfine powder
Be dried with it is primarily broken, then by high pressure draught dispersion combine electrostatic dispersion it is possible to prevente effectively from sub-micron-powder in gas
The secondary coalescence flowed in transmission process is reunited, and then promotes desulphurization and denitration or demercuration efficiency.
The Applicant declares that the present invention is explained by the above embodiments detailed process equipment and process flow of the invention,
But the present invention is not limited to the above detailed process equipment and process flow, that is, it is above-mentioned detailed not mean that the present invention must rely on
Process equipment and process flow could be implemented.It should be clear to those skilled in the art, any improvement in the present invention,
Addition, selection of concrete mode of equivalence replacement and auxiliary element to each raw material of product of the present invention etc., all fall within of the invention
Within protection scope and the open scope.
Claims (10)
1. a kind of dispersion of ultrafine powder and spraying system, which is characterized in that the system comprises powder fluidization devices, high pressure draught
Dispersal device, electrostatic dispersion device and powder output device；Wherein, powder fluidization device side wall is equipped with superfine powder feed inlet,
Powder fluidization bottom of device is equipped with gas access, is equipped with material outlet, material outlet and high pressure draught at the top of powder fluidization device
The material inlet of dispersal device is connected；The material inlet phase of the material outlet of high pressure draught dispersal device and electrostatic dispersion device
Even, the material outlet of the material outlet of electrostatic dispersion device and powder output device.
2. system according to claim 1, which is characterized in that 10 μm of the average grain diameter < of the superfine powder；
Preferably, the superfine powder feed inlet connects superfine powder feeding device；
Preferably, the superfine powder feeding device includes superfine powder storage tank and feeding material component, storage tank by feeding material component with
The connection of superfine powder feed inlet；
Preferably, the feeding material component includes screw conveyor and/or chain transfer；
Preferably, the powder fluidization device includes fluidized bed.
3. system according to claim 1 or 2, which is characterized in that the high pressure draught dispersal device includes gas pipeline,
High pressure gas nozzle is arranged in gas pipeline end；
Preferably, the system also includes gas heat drying device, the gas vents and powder of the gas heat drying device
The gas access of body fluidizer is connected with the gas pipeline entrance of high pressure draught dispersal device；
Preferably, between the gas vent of the gas heat drying device and the gas pipeline entrance of high pressure draught dispersal device
Pressure conveying assembly is set；
Preferably, the pressure conveying assembly includes high pressure blower, and discharge pressure is 80kPa~100kPa.
4. system according to claim 1-3, which is characterized in that the electrostatic dispersion device include charged needle,
Charged needle rack, insulation tube, ground loop and power supply, wherein charged needle and charged needle rack are placed in insulation tube, charged needle and lotus
Acusector support vertical is simultaneously connected, and charged needle rack is fixed in insulation tube, and ground loop is around encirclement insulation tube, power supply and charged needle
Bracket is connected.
5. system according to claim 1-4, which is characterized in that the powder output device includes Lavalle spray
Pipe；
Preferably, the powder output device connects the device of pending superfine powder；
Preferably, the device of the pending superfine powder includes in the furnace of burner and in tail flue gas pipeline；
Preferably, the burner includes coal-burning boiler and/or circulating fluidized bed boiler.
6. system according to claim 1-5, which is characterized in that the system comprises superfine powder chargings to fill
It sets, gas heat drying device, powder fluidization device, high pressure draught dispersal device, electrostatic dispersion device and powder output device；
Powder fluidization device side wall is equipped with superfine powder feed inlet, and superfine powder feed inlet connects superfine powder feeding device, surpasses
Fine powder feeding device includes superfine powder storage tank and feeding material component, and storage tank is connected by feeding material component and superfine powder feed inlet
It connects；
Powder fluidization bottom of device is equipped with gas access, and gas access connects the gas vent of gas heat drying device, gas
The gas vent of heat drying device is also connected with the gas pipeline entrance of high pressure draught dispersal device, gas heat drying device
Gas vent and high pressure draught dispersal device gas pipeline entrance between high pressure blower is set；
Material outlet is equipped at the top of powder fluidization device, material outlet is connected with the material inlet of high pressure draught dispersal device, high
Pressure gas stream dispersal device includes gas pipeline, and high pressure gas nozzle is arranged in gas pipeline end；
The material outlet of high pressure draught dispersal device is connected with the material inlet of electrostatic dispersion device, and electrostatic dispersion device includes lotus
Acusector, charged needle rack, insulation tube, ground loop and power supply, wherein charged needle and charged needle rack are placed in insulation tube, charged
Needle and charged needle rack are vertical and are connected, and charged needle rack is fixed in insulation tube, ground loop around surrounding insulation tube, power supply with
Charged needle rack is connected；
The material outlet of electrostatic dispersion device and the material outlet of powder output device, powder output device include Lavalle spray
Pipe；
Wherein, feeding material component includes screw delivery pump and/or chain transfer.
7. a kind of processing method of system as claimed in any one of claims 1 to 6, which is characterized in that the described method includes:
Superfine powder is successively exported after fluidization, high pressure draught dispersion and electrostatic dispersion.
8. processing method according to claim 7, which is characterized in that the fluidization carries out in powder fluidization device；
Preferably, the gases used air for by heating in the fluidizing gas；
Preferably, the temperature of the air by heating is 60 DEG C~90 DEG C；
Preferably, flow velocity gases used in the fluidizing gas is 3m/s~5m/s；
Preferably, the high pressure draught is dispersed in high pressure draught dispersal device and carries out；
Preferably, the pressure of high pressure draught used is 80kPa~100kPa in high pressure draught dispersion；
Preferably, high pressure draught used is into the air crossed after heating in high pressure draught dispersion, and temperature is 60 DEG C~90
℃；
Preferably, the electrostatic dispersion carries out in electrostatic dispersion device；
Preferably, power supply applied in the electrostatic dispersion is high voltage power supply, and voltage is 50kV~90kV；
Preferably, electric current is 6mA~8mA in the electrostatic dispersion；
Preferably, the output is carried out by powder output device；
Preferably, the powder output is sprayed using Laval nozzle.
9. processing method according to claim 7 or 8, which is characterized in that the described method includes:
10 μm of average grain diameter < of superfine powder is subjected to fluidization by the air of heating in powder fluidization device, through overcurrent
Powder after state is 80kPa~100kPa in pressure, carries out high pressure under the action of the high pressure draught that temperature is 60 DEG C~90 DEG C
Disperse, the powder after high pressure draught disperses is 50kV~90kV in voltage, and electric current carries out electrostatic under conditions of being 6mA~8mA
Disperse, is sprayed after electrostatic by Laval nozzle.
10. a kind of purposes of system as claimed in any one of claims 1 to 6, which is characterized in that the system is for the dress that burns
The injection of additive in the furnace set and/or in tail flue gas pipeline；
Preferably, the system is for adding in coal-burning boiler and/or circulating fluid bed boiler and/or in tail flue gas pipeline
Add the injection of agent.
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