CN109173552A - A kind of flue gas purifying method and system - Google Patents
A kind of flue gas purifying method and system Download PDFInfo
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- CN109173552A CN109173552A CN201811197829.XA CN201811197829A CN109173552A CN 109173552 A CN109173552 A CN 109173552A CN 201811197829 A CN201811197829 A CN 201811197829A CN 109173552 A CN109173552 A CN 109173552A
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- flue gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D51/00—Auxiliary pretreatment of gases or vapours to be cleaned
- B01D51/02—Amassing the particles, e.g. by flocculation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
-
- 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
- B01D53/46—Removing components of defined structure
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
-
- 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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- 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 present invention provides a kind of flue gas purifying methods, belong to fume treatment technical field, comprising: spray atomized water to flue gas moisture content to the flue gas containing solid particle and reach saturation；Continuing to spray atomized water to saturated flue gas makes flue-gas temperature reduce to form the drop containing solid particle is carried, and carries the drop of solid particle as flow of flue gas grows into the solid-liquid hybrid particles that partial size is at least 10 μm；Solidliquid mixture in flue gas is separated with gas, isolated clean gas and solidliquid mixture recycle solidliquid mixture.This method simulates natural precipitation, so that solid particle is grown up in flue gas, laggard promoting the circulation of qi body separation of growing up, removal rate height；And heating is carried out to purifying smoke after solid particle removal in flue gas and is then exhausted from, moreover it is possible to the phenomenon that avoiding white plume generation.The present invention also provides the device for implementing the above method, the device is good to the removal effect of solid particle in flue gas.
Description
Technical field
The present invention relates to fume treatment technical fields, in particular to a kind of flue gas purifying method and system.
Background technique
Solid particle and white in the devices flue gas such as fluid catalytic cracking (FCC) and power plant in domestic petroleum chemical company
Plume is one of Air Pollutant Discharge.FCC apparatus mainly uses solid in smoke-gas wet desulfurization technology removing flue gas at present
Grain, but concentration of solid particles in flue gas can only be reduced to 30~50mg/m by the technology3, new edition is executed after on July 1st, 2017
" petroleum refining industry pollutant emission standard " (GB/31570-2015), solid particle is by 50mg/m3It is reduced to 30mg/m3, and
Technology can just reach standard requirements at present, easily cause solids discharge exceeded as device runs to occur fluctuating.Thermoelectricity
In " fossil-fuel power plant atmospheric pollutant emission standard " (GB/13223-2011) regulation coal-burning boiler flue dust that factory put into effect early in 2011
Particle concentration discharge is no more than 30mg/m3, the granular material discharged concentration in key area is no more than 20mg/m3。
Electrostatic precipitator technology is primarily present problem: (1) operating trouble probability is big, it is difficult to ensure that 3 years or so fault-frees are continuous
Operation, considers at least to be designed to two parallel Room two-way thus, this will increase cost of investment.(2) it is difficult to adapt to the flue gas of burst
Overtemperature, it is necessary to setting bypass, but granular material discharged at this time will greatly improve.(3) entry operation condition requires high, when entrance particle
When object fluctuation of concentration is larger, the discharge for exporting particulate matter will be unable to ensure.(4) certain power consumption is needed, relative energy consumption is higher.
(5) it takes up a large area, is not easy further expansion ability.
In consideration of it, special propose the application.
Summary of the invention
The present invention provides a kind of flue gas purifying methods, it is intended to improve the problem of existing fume treatment still has much room for improvement.
The present invention also provides a kind of flue gas purification systems, can implement flue gas purifying method provided by the invention, can mould
Solid particle in flue gas is removed more thorough by quasi- natural precipitation process.
The present invention is implemented as follows:
A kind of flue gas purifying method, comprising:
Atomized water to flue gas moisture content, which is sprayed, to the flue gas containing solid particle reaches saturation；
Continuing to spray atomized water to saturated flue gas makes flue-gas temperature reduce to form the drop containing solid particle is carried, and carries
There is the drop of solid particle to grow into the solid-liquid hybrid particles that partial size is at least 10 μm with flow of flue gas；
Solidliquid mixture in flue gas is separated with gas, isolated clean gas and solidliquid mixture will be consolidated
Liquid mixture recycling.
Further, it in preferred embodiments of the present invention, handles the solidliquid mixture collection of recycling to obtain primary water,
Primary water is used to spray atomized water to flue gas.
It further, further include that will heat up through the clean gas that gas solid separation obtains in preferred embodiments of the present invention
It is discharged at least 80 DEG C.
Further, in preferred embodiments of the present invention, before the flue gas containing solid particle is sprayed atomized water
Further include:
By the flue gas cool-down containing solid particle to after 80~120 DEG C, flue gas is passed through in wet desulphurization device, through wet process
Again through being atomized water process after desulfurizer processing.
Further, in preferred embodiments of the present invention, the temperature-rise period of clean gas carries out in heat-exchanger rig, changes
Heat source is untreated high-temperature dust-containing flue gas.
A kind of flue gas purification system, for implementing above-mentioned flue gas purifying method, including smoke discharge tube road, first are efficiently
Atomizer, the second high-efficiency atomizing nozzle and cyclone separator are disposed with and smoke discharge tube road on smoke discharge tube road
The flue gas saturation region of connection and condensation rainfall area, for the first high-efficiency atomizing nozzle spray direction towards in flue gas saturation region, second is high
Atomizer spray direction is imitated towards condensing in rainfall area, cyclone separator is connected to condensation rainfall area.
Further, in preferred embodiments of the present invention, flue gas purification system further includes wet desulphurization device, and wet process is de-
Sulphur device is connected to flue gas saturation region, and is located at flue gas saturation region workshop section upstream.
Further, in preferred embodiments of the present invention, flue gas purification system further includes heat exchanger, heat exchanger for pair
Untreated high-temperature dust-containing flue gas cooling, and to the gas heating being discharged from cyclone separator, heat exchanger and wet desulphurization device
Connection is located at wet desulphurization device workshop section upstream, and heat exchanger is connect with cyclone separator, is located at cyclone separator workshop section downstream.
Further, in preferred embodiments of the present invention, flue gas purification system further includes sewage disposal system, whirlwind point
Isolated solidliquid mixture is emitted into sewage disposal system from device, sewage disposal system includes supernatant discharge pipe,
Supernatant discharge pipe is connected to the first high-efficiency atomizing nozzle and the second high-efficiency atomizing nozzle.
Further, in preferred embodiments of the present invention, sewage disposal system includes that a heavy pond, secondary settling tank and emergency are heavy
Pond drops, isolated solidliquid mixture is emitted into a heavy pond by cyclone separator, and a heavy pond is connected to secondary settling tank, a heavy pond with
Secondary settling tank is connected to emergency settling tank, and the top of secondary settling tank is connected to supernatant discharge pipe.
The beneficial effects of the present invention are: the flue gas purifying method that the present invention obtains by above-mentioned design, principle is so that cigarette
Solid particle is grown up to 10 μm or more in gas, then carries out gas solid separation again.Mainly by spraying into water mist into flue gas, make it
Reach saturation state, water mist is then sprayed into flue gas again reduces rapidly its temperature, using solid particle in flue gas as solidifying
Tuberculosis is condensed in solid particles surface using steam phase transforming, simulates the process of natural precipitation, make solid particle " growing up ".Flue gas
Its inner droplets and fine solid particle, drop and drop, dust-laden drop and drop, dust-laden drop and dust-laden drop etc. during exercise
Occur mutually collision, reunite, absorption the effects of make particle further " growing up ", " grow up " 10 μm of completion or less in region in particle
Long greatly 10 μm or more of the opposite bulky grain process of fine grained.The recycling of fine powder solid particle is realized in last gas separation, from
And reach the minimum discharge of solid particle.The process not only realizes the ultra-clean emission problem of fine powder solid particulate matter, simultaneously also
The exhaust temperature of clean flue gas is enabled to become lower.Particularly, obtained clean flue gas is heated to 80 degrees Celsius or more
Discharge is also avoided that " white plume " generates.
The flue gas purification system that the present invention obtains by above-mentioned design can implement method provided by the invention, due to setting
Two high-efficiency atomizing nozzles atomized water successively can be sprayed to the flue gas in smoke discharge tube, simulate natural precipitation process so that
Flue gas contained particulate matters mass-energy in flowing is gradually grown up to 10 μm or more, then via cyclone separator by the solid after growing up
Grain discharge, whole process is simple, good to the removal effect of solid particle in flue gas, elastic big, the technique entirety pressure drop of system operatio
Small, no vulnerable part is easy-maintaining, at low cost.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of embodiment of the present invention
Attached drawing be briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not to be seen as
It is the restriction to range, it for those of ordinary skill in the art, without creative efforts, can be with root
Other relevant attached drawings are obtained according to these attached drawings.
Fig. 1 is wet flue gas temperature of the present invention and humidity relation schematic diagram；
Fig. 2 is the process flow chart for the flue gas purification system that embodiment of the present invention provides.
Icon: 100- flue gas purification system；110- smoke discharge tube road；111- flue gas saturation region；112- condenses rainfall area；
The first high-efficiency atomizing nozzle of 121-；The second high-efficiency atomizing nozzle of 122-；130- cyclone separator；140- wet desulphurization device；
150- heat exchanger；160- sewage disposal system；161- supernatant discharge pipe；162- mono- sinks pond；163- secondary settling tank；164- emergency is heavy
Pond drops；165- fresh water water inlet pipe；170- chimney.
Specific embodiment
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be in the embodiment of the present invention
Technical solution be clearly and completely described.The person that is not specified actual conditions in embodiment, according to normal conditions or manufacturer builds
The condition of view carries out.Reagents or instruments used without specified manufacturer is the conventional production that can be obtained by commercially available purchase
Product.
A kind of flue gas purifying method is provided to the embodiment of the present invention below to illustrate.
A kind of flue gas purifying method, comprising:
S1, atomized water to flue gas moisture content is sprayed to the flue gas containing solid particle reach saturation.
Specifically, the flue gas by the temperature containing solid particle at 160~200 DEG C cools down, so that temperature is down to 80
~120 DEG C, it is preferred that cooling is carried out using heat exchanger.Contain SOx and NOx in usual flue gas, the flue gas after cooling can be led to
Enter in wet process wet desulphurization device, SOx and NOx and most of solid particle in removal flue gas.Flue gas enters wet desulphurization dress
It needs that its pole cold water spray will increase vapor in flue gas and contain there are a large amount of water mists when due to spray using lye after setting
Amount, simultaneously because flue-gas temperature reduces, water vapour content basically reaches saturation state in flue gas, simultaneously because flue-gas temperature drops
Low, vapour content basically reaches saturation state in flue gas.
Flue gas is saturated the saturated flue gas containing solid particle after wet desulphurization, in flue gas and is substantially removed, solid in flue gas
Body granule content is in 20~40mg/m3, temperature is down to 45~55 DEG C, if these low temperature saturation wet flue gas is directly discharged into through chimney
In atmosphere, still there is certain pollution to atmosphere, and even if exist due to process of wet desulphurization or without process of wet desulphurization flue gas
Flow process condenses into fine droplet in case of cold air, to generate " white plume ".Although simple " white plume " is to environment
Quality does not influence, but influences environmental perception, can even be mistaken as toxic harmful exhaust gas sometimes.
It therefore, will treated that flue gas continues to handle through wet desulphurization device.To what is handled through wet desulphurization device
Flue gas sprays atomized water, so that flue gas reaches saturation.
S2, continue to spray atomized water to saturated flue gas flue-gas temperature made to reduce to form the drop containing solid particle is carried,
The drop of solid particle is carried as flow of flue gas grows into the solid-liquid hybrid particles that partial size is at least 10 μm.
The flue gas for reaching saturation is sent to next unit immediately, continues to spray a large amount of atomized waters to it flue-gas temperature is dropped
It is low, and the water vapour in flue gas is made to realize that condensation forms drop in solid particles surface.With the flue gas containing drop continue to
Next workshop section's flowing, solid particle are constantly attached to drop, i.e. particle is constantly grown up, and form solid-liquid of the partial size greater than 10 μm and mix
Particle.
S3, the solidliquid mixture in flue gas is separated with gas, isolated clean gas and solidliquid mixture, it will
Solidliquid mixture recycling.
The flue gas for carrying the solid-liquid hybrid particles that partial size is at least 10 μm that S2 step process is crossed is passed through to whirlwind point
From gas solid separation is carried out in device, solid-liquid hybrid particles are recovered concentration and carry out precipitation process, the supernatant obtained through precipitation process
It is used for S1 and S2 step and sprays atomized water to flue gas.The sludge that precipitation process obtains then is transported by compression.Gas solid separation obtains
Flue gas then flow into next workshop section or discharge.
Flue gas after further removing solid particle is clean flue gas, and particles contained content is extremely low directly to arrange
It puts, but there are still lead to the problem of " white plume " for direct emission.
Preferably, it is discharged after the flue-gas temperature obtained through gas solid separation being increased to 80 DEG C.Flue-gas temperature is increased to 80
DEG C it can eliminate white cigarette.The flue gas then given off is the clean flue gas for not generating " white plume ".
Preferably, the flue gas obtained through gas solid separation is led to when the flue-gas temperature obtained through gas solid separation being increased to 80 DEG C
Enter in the heat exchanger mentioned into S1 step, is added using untreated high-temperature dust-containing flue gas as heat source to the flue gas that will be excluded
Heat, by flue gas to discharging after at least 80 DEG C.
The elimination principle of white plume is as shown in Figure 1, curve is saturated flue gas curve in Fig. 1.Straight line is to reach flue gas
The critical line of saturation.
A point is 55 DEG C of wet flue gas initial temperature, and C point is 20 DEG C of environment temperature.Snead process is such as used, it need to be by A point
Wet flue gas be heated to A1 point 72 DEG C or more could eliminate white cigarette, and the temperature difference is 17 DEG C；If first A point wet flue gas temperature is reduced to
(50 DEG C) of the B point partial moistures removed in wet flue gas, are then heated to B1 point (60 DEG C) from B point again, can eliminate white cigarette, and its
The temperature difference only has 10 DEG C.If A point flue-gas temperature is reduced to D point (40 DEG C), then D1 point (45 DEG C) are heated to from D point, just
White cigarette can be eliminated, and its temperature difference only has 5 DEG C.
When flue-gas temperature is reduced to 40 DEG C, 10 DEG C to 50 DEG C can be risen for flue-gas temperature by then passing through heating, in this condition
Lower to eliminate white cigarette for guarantee, environment temperature is minimum can be to 10 DEG C.
Similarly such as flue-gas temperature can be heated more up to 80 DEG C or more, then environment temperature is minimum to guarantee to eliminate white cigarette
It can thus may be implemented to 0 DEG C, along with discharge flue gas mixes the effect spread with cool ambient air in the most areas in China
The problem of such chimney emits white cigarette is substantially eliminated in the annual time.
As shown in Fig. 2, a kind of flue gas purification system 100, for implementing flue gas purifying method provided by the invention comprising
Smoke discharge tube road 110, the first high-efficiency atomizing nozzle 121, the second high-efficiency atomizing nozzle 122 and gas fractionation unit, at this
In invention specific embodiment, gas fractionation unit selects cyclone separator 130.Smoke discharge tube road 110 is connect with waste heat boiler,
Flue gas for being discharged in waste heat boiler.
The flue gas saturation region 111 being connected to smoke discharge tube road 110 and condensation are disposed on smoke discharge tube road 110
Rainfall area 112,121 spray direction of the first high-efficiency atomizing nozzle is towards in flue gas saturation region 111, the second high-efficiency atomizing nozzle 122
Towards condensing in rainfall area 112, cyclone separator 130 is connected to spray direction with condensation rainfall area 112.Cigarette containing solid particle
Gas, in smoke discharge tube road 110, when flowing to flue gas saturation region, the first high-efficiency atomizing nozzle 121 is sprayed to flue gas to be atomized
Water, so that vapor reaches saturation in flue gas, then flue gas continues to run to condensation rainfall area 112, the second high-efficiency atomizing nozzle
122 spray a large amount of atomized waters to flue gas, so that Water vapor condensation is at water droplet.Flue gas continues flow forward, and in flow process
The solid-liquid hybrid particles that partial size is greater than 10 μm are constantly grown up into, solid-liquid hybrid particles of the partial size greater than 10 μm are then carried
Flue gas enters progress gas separation in cyclone separator 130, and solid-liquid hybrid particles are removed, and obtains the cigarette of removal solid particle
Gas.Using high-efficiency atomizing nozzle, mist droplet particle size can be made to reach 20 μm or so, increase solid particle and droplet collision probability, increased
Strong solid particle growth effect, particle growth effect can be reached by being not required to largely spray water.
Preferably, flue gas purification system 100 further includes wet desulphurization device 140, and wet desulphurization device 140 and flue gas are saturated
Area 111 is connected to, and is located at 111 workshop section upstream of flue gas saturation region.Some untreated high-temperature dust-containing flue gas carry SOx contents compared with
Height, and SOx direct emission can cause larger harm to bad border, therefore, need to carry out SOx from the flue gas containing solid particle from
Reason.Enter after wet desulphurization device 140 carries out wet desulphurization from the flue gas containing solid particle, then flow to flue gas saturation region 111
Middle progress flue gas saturated process.
Current particle separative efficiency of the industrial cyclone separator to partial size at 10 μm or more can generally reach 98%
~99%, and flue gas purification system 100 is realized what fine powder solid particle was grown up, is reached to small by simulating natural precipitation process
It grows up in 10 μm of solid grain sizes to 10 μm or more, is finally realized in Flow field of cyclone and fine particle object is returned
Receipts process.General desulfurization wet desulphurization device exit 30~50mg/m of concentration of solid particles3, it is ensured that by solid in flue gas
Grain concentration is reduced to 10mg/m3, the Effiency of whirlwind Separator according to the present invention need to only reach 70%~80%, at this
Under part, the separative efficiency of cyclone separator can reach 98% or more, using concentration of solid particles energy in flue gas after the present invention
Enough it is reduced to 10mg/m3Below.Therefore the solid particle recovery efficiency of flue gas purification system 100 provided by the invention is high.
Preferably, flue gas purification system 110 further includes heat exchanger 150, and heat exchanger 150 is used for untreated high temperature dust
Flue gas cool-down, and to the gas heating being discharged from cyclone separator 130, heat exchanger 150 is connected to 140 with wet desulphurization device, position
In 140 workshop section upstream of wet desulphurization device, heat exchanger 150 is connect with cyclone separator 130, is located at 130 workshop section of cyclone separator
Downstream.
In 140 workshop section upstream of wet desulphurization device, heat exchanger 150 is set, it can be in entrance wet desulphurization device 140
Flue gas cools down, so that sweetening process effect is higher, reduces the flue-gas temperature into wet desulphurization device by 200 DEG C or so
To 100 DEG C or so, volume needed for wet desulphurization device chilling sprays can be substantially reduced, to reduce corresponding cost.And
Heat exchanger 150 is also connect with cyclone separator 130, and is located at 130 workshop section downstream of cyclone separator, with untreated high temperature dust
Flue gas is heat source, the flue gas that the flue gas that cyclone separator 130 can be discharged heats up, and is discharged from cyclone separator 130
Cold source is also used as to just cooling down from the flue gas containing solid particle.In this way, being then able to achieve the comprehensive high-efficiency benefit of the energy
With.
Flue-gas temperature after the heating of heat exchanger 150 is increased to 80 degrees Celsius or more, is discharged by chimney 170, the cigarette of discharge
Gas is the flue gas of clear, colorless.The phenomenon that traditional flue gas discharge generates white cigarette is eliminated, realizes ultra-clean discharge.
Further, flue gas purification system 100 further includes sewage disposal system 160, the solid-liquid discharge of cyclone separator 130
Mouthful be connected to sewage disposal system 160, sewage disposal system 160 includes supernatant discharge pipe 161, supernatant discharge pipe 161 and
First high-efficiency atomizing nozzle 121 is connected to 122 with the second high-efficiency atomizing nozzle.
Above-mentioned setting is recycled and reused for flue gas atomization so that be enough recovered for the water energy of atomizing spray again after processing.
Recycling for resource is realized, water consumption is small.
Further, sewage disposal system 160 includes a heavy pond 162, secondary settling tank 163 and emergency settling tank 164, will be separated
To solidliquid mixture be emitted into a heavy pond 162, a heavy pond 162 is connected to secondary settling tank 163, and a heavy pond 162 and secondary settling tank 163 are equal
It is connected to emergency settling tank, the top of secondary settling tank 163 is connected to 161 with supernatant discharge pipe.The sewage disposal system 160 can be
The subsequent solid-liquid processing system of wet desulphurization device, the then solidliquid mixture being discharged from wet desulphurization device 140 and cyclonic separation
The solidliquid mixture that device 130 is discharged can be uniformly processed.So do not need additionally to increase processing cost.
Since atomized water is not high to water quality requirement, only need that flue gas can be made to adhere to, therefore, as long as water treatment facilities
It can reach except solid effect.Gu only multiple sedimentation basins need to be arranged then can be realized the processing to solidliquid mixture, setting precipitating
Pool process requirement is low, and construction cost is not high.The case where in order to cope with the high water-base fluids such as rainy day, setting emergency sedimentation basin 164 are protected
Card water treatment work can be normally carried out at any time.
Further, supernatant discharge pipe 161 is connected with fresh water water inlet pipe 165.Since vapor or water droplet are flowing
In cyclic process, inevitable that loss, setting fresh water water inlet pipe 165 is to supplement atomized water at any time.
In conclusion flue gas purifying method provided by the invention is to make to the principle being removed in solid particle in flue gas
It obtains solid particle in flue gas to grow up to 10 μm or more, then carries out gas separation again.Mainly by spraying into water mist into flue gas,
Saturation state is reached, water mist is then sprayed into flue gas again reduces rapidly its temperature, makees using solid particle in flue gas
For the nuclei of condensation, is condensed using steam phase transforming in solid particles surface, simulate the process of natural precipitation, make solid particle " growing up ".
Flue gas its inner droplets and fine solid particle, drop and drop, dust-laden drop and drop, dust-laden drop and dust-containing liquid during exercise
The generations such as drop the effects of mutually collide, reunite, adsorbing, keeps particle further " growing up ", " grows up " 10 μm of completion in region in particle
Long greatly 10 μm or more of the opposite bulky grain process of fine grained below.Returning for fine powder solid particle is realized in last gas separation
It receives, to reach the minimum discharge of solid particle.The process not only realizes the ultra-clean emission problem of fine powder solid particulate matter, together
When the exhaust temperature of clean flue gas can also be made to become lower.Particularly, obtained clean flue gas is heated to 80 DEG C or more
Also it is avoided that white cigarette generates.
Flue gas purification system provided by the invention can implement method provided by the invention, due to two efficient mists of setting
Changing nozzle successively can spray atomized water to the flue gas in smoke discharge tube, natural precipitation process be simulated, so that flue gas is in flowing
Contained particulate matters mass-energy is gradually grown up to 10 μm or more, then the solid particle discharge after growing up via cyclone separator, entirely
Process is simple, good to the removal effect of solid particle in flue gas, and system operatio elasticity is big, technique entirety pressure drop is small, no vulnerable part,
It is easy-maintaining, it is at low cost.
The foregoing is merely the preferred embodiment of the present invention, are not intended to restrict the invention, for this field
For technical staff, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of flue gas purifying method characterized by comprising
Atomized water to flue gas moisture content, which is sprayed, to the flue gas containing solid particle reaches saturation；
Continuing to spray atomized water to saturated flue gas makes flue-gas temperature reduce to form the drop containing solid particle is carried, and carries solid
The drop of body particle grows into the solid-liquid hybrid particles that partial size is at least 10 μm with flow of flue gas；
Solidliquid mixture in flue gas is separated with gas, isolated clean gas and solidliquid mixture, it will be described solid
Liquid mixture recycling.
2. flue gas purifying method according to claim 1, which is characterized in that handle the solidliquid mixture collection of recycling
To primary water, primary water is used to spray atomized water to flue gas.
3. flue gas purifying method according to claim 1, which is characterized in that further include the cleaning that will be obtained through gas solid separation
Gas heating at least 80 DEG C discharge.
4. flue gas purifying method according to claim 3, which is characterized in that the flue gas containing solid particle is being sprayed mist
Before change water further include:
After untreated high-temperature dust-containing flue gas is cooled to 80~120 DEG C, flue gas is passed through in wet desulphurization device, through described wet
Again through being atomized water process after the processing of method desulfurizer.
5. flue gas purifying method according to claim 4, which is characterized in that the temperature-rise period of the clean gas is exchanging heat
It is carried out in device, heat exchange heat source is untreated high-temperature dust-containing flue gas.
6. a kind of flue gas purification system, which is characterized in that for implementing gas cleaning as claimed in any one of claims 1 to 5
Method, including smoke discharge tube road, the first high-efficiency atomizing nozzle, the second high-efficiency atomizing nozzle and gas fractionation unit, the cigarette
It is disposed with the flue gas saturation region being connected to the smoke discharge tube road on gas discharge line and condenses rainfall area, described first
High-efficiency atomizing nozzle spray direction is towards in the flue gas saturation region, and the second high-efficiency atomizing nozzle spray direction is described in
It condenses in rainfall area, the gas fractionation unit is connected to the condensation rainfall area.
7. flue gas purification system according to claim 6, which is characterized in that the flue gas purification system further includes that wet process is de-
Sulphur device, the wet desulphurization device are connected to the flue gas saturation region, and are located at the flue gas saturation region workshop section upstream.
8. flue gas purification system according to claim 7, which is characterized in that the flue gas purification system further includes heat exchange
Device, the heat exchanger are used to cool down to high-temperature dust-containing flue gas, and to the gas heating being discharged from the gas fractionation unit, described
Heat exchanger is connected to the wet desulphurization device, is located at wet desulphurization device workshop section upstream, the heat exchanger and the gas
The connection of body separator, is located at gas fractionation unit workshop section downstream.
9. flue gas purification system according to claim 6, which is characterized in that the flue gas purification system further includes at sewage
Reason system, the gas fractionation unit are connected to the sewage disposal system, and the sewage disposal system includes supernatant discharge
Pipe, the supernatant discharge pipe are connected to first high-efficiency atomizing nozzle and second high-efficiency atomizing nozzle.
10. flue gas purification system according to claim 9, which is characterized in that the sewage disposal system include a heavy pond,
The isolated solidliquid mixture is emitted into described one and sunk by secondary settling tank and emergency settling tank, the gas fractionation unit
Pond, a heavy pond are connected to the secondary settling tank, and a heavy pond and the secondary settling tank are connected to the emergency settling tank, institute
The top for stating secondary settling tank is connected to the supernatant discharge pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811197829.XA CN109173552A (en) | 2018-10-15 | 2018-10-15 | A kind of flue gas purifying method and system |
Applications Claiming Priority (1)
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Application publication date: 20190111 |