CN110465163A - A kind of flue gas water capturing installation and ceramic membrane cleaning process based on ceramic membrane - Google Patents
A kind of flue gas water capturing installation and ceramic membrane cleaning process based on ceramic membrane Download PDFInfo
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- CN110465163A CN110465163A CN201910773579.8A CN201910773579A CN110465163A CN 110465163 A CN110465163 A CN 110465163A CN 201910773579 A CN201910773579 A CN 201910773579A CN 110465163 A CN110465163 A CN 110465163A
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- 239000000919 ceramic Substances 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 76
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 75
- 238000004140 cleaning Methods 0.000 title claims abstract description 64
- 230000008569 process Effects 0.000 title claims abstract description 53
- 239000003546 flue gas Substances 0.000 title claims abstract description 50
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 239000012528 membrane Substances 0.000 title claims abstract description 49
- 238000009434 installation Methods 0.000 title claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 39
- 239000007921 spray Substances 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 238000011010 flushing procedure Methods 0.000 claims description 23
- 239000012459 cleaning agent Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 229920000642 polymer Polymers 0.000 claims description 5
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 abstract description 11
- 239000003344 environmental pollutant Substances 0.000 description 13
- 231100000719 pollutant Toxicity 0.000 description 13
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 12
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 239000013618 particulate matter Substances 0.000 description 7
- 229910052925 anhydrite Inorganic materials 0.000 description 6
- 238000010926 purge Methods 0.000 description 6
- 230000005684 electric field Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 5
- 235000019341 magnesium sulphate Nutrition 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000010419 fine particle Substances 0.000 description 4
- 238000004506 ultrasonic cleaning Methods 0.000 description 4
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 235000011149 sulphuric acid Nutrition 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000002738 chelating agent Substances 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 210000002257 embryonic structure Anatomy 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 229910052573 porcelain Inorganic materials 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000004781 supercooling Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- -1 removes grease Chemical compound 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000001089 thermophoresis Methods 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000010148 water-pollination Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
- B01D46/543—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms using membranes
-
- 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
- B01D53/22—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 by diffusion
-
- 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
- B01D53/26—Drying gases or vapours
- B01D53/268—Drying gases or vapours by diffusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- 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
- B01D53/22—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 by diffusion
- B01D2053/221—Devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
- B01D2257/2045—Hydrochloric acid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/04—Backflushing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/168—Use of other chemical agents
Abstract
The invention belongs to flue gases to catch water technical field more particularly to a kind of flue gas water capturing installation and ceramic membrane cleaning process based on ceramic membrane.Flue gas water capturing installation of the invention, unit, low temperature process spray unit are alternately backwashed including ceramic membrane unit, chemical cleaning unit, gas-liquid, it solves the problems, such as that mechanical cleaning water consumption is big, wash clean clearly and chemical dosage, the pollution problem to environment of small fine grained and sour gas in flue gas is also solved, further improves ceramic film component to the capture rate of vapor.
Description
Technical field
The invention belongs to flue gases to catch water technical field more particularly to a kind of flue gas water capturing installation and ceramics based on ceramic membrane
Membrane cleaning technique.
Background technique
For FGD exiting flue gas due to the abundant sprinkling by desulfurization slurry, the vapor in flue gas is at hypersaturated state,
This partial fume will be discharged into atmosphere by chimney, cause great lot of water resources waste, and containing a large amount of small in flue gas
Fine grained and sour gas etc. will also result in very big harm to environment.So how many people's researchs capture this portion now
Vapor in point flue gas, wherein ceramic membrane technology is now to catch a kind of more advantageous method in water technology, but ceramic membrane
It catches in water technology, the small fenestra in aperture is highly susceptible to pollutant blocking, and the meeting that small fine grained has is attached to film surface, has
Meeting be gathered in membrane pores, be decreased obviously its penetration flux, in ceramic membrane filter technology usually will adapted flusher,
The pollutant of ceramic membrane surface is removed in time, penetration flux is kept to stablize.
Existing ceramic film component purging method has following four.Mechanical cleaning process: mechanical cleaning is clear including backwash, negative pressure
It washes, impregnate and mechanical curettage etc., backwash is a kind of relatively common cleaning method, passes through the gas or liquid of certain pressure
Body, back flush ceramic membrane are detached from the pollutant of film outer surface, to restore the flux of ceramic membrane；Negative pressure cleaning is to make pottery
The outside of porcelain film forms negative pressure, by pressure difference the pollutant of surface and hole is detached from；Mechanical curettage method is by soft
Material is wiped repeatedly film surface, carries out mechanicalness removal to pollutant.Chemical cleaning method: according to ceramic membrane surface
Dirty layer property, selects suitable chemical, will remove after the dissolution of dirty layer, common chemical has acid & alkali liquid, chelating
Agent, oxidant and surfactant, these cleaning solutions are both for different dirty layers, as acid solution mainly removes carbonic acid respectively
Calcium, calcium phosphate and metal oxide；Lye mainly removes grease, albumen and algae substances；Chelating agent is usually used in removing alkali
Earth metal sulfate；Oxidant is for removing organic matter and microorganism.Ultrasonic cleaning process: closely contaminated ceramic membrane is put
Enter and cleaned in special ultrasonic cleaning equipment, using water as scouring media.The ablution of ultrasonic wave has very ceramic membrane
Strong penetrability, so, present foreign countries have many scholars to further investigate this.Electric field ablution: apply on ceramic membrane
One electric field, the direction displacement of charged particle and molecule along electric field in pollutant, the energization of clearance stage, into
The removal of row repeatedly.
All improve the permeability of ceramic film component to a certain extent in the prior art, but, depend merely on a kind of cleaning technique
Sometimes process requirements are unable to satisfy.Mechanical cleaning process: needing the flushing of a large amount of flushing water repeatedly during mechanical cleaning, consumption
Water is very big；And the stronger pollutant of adhesiveness not can be removed by the flushing of flushing water.Chemical cleaning method: chemical cleaning
In the process, it is necessary to corresponding chemical flush agent be utilized to the pollutant of ceramic membrane, moreover, the dirt constituted for multiple pollutant
Layer, single cleaning solution not can be removed yet, it is necessary to clean repeatedly by multiple kinds of cleaning agent.In addition, flow of cleaning solution etc. will be into
Row strict control avoids causing ceramic membrane irreversible damage.Ultrasonic cleaning process: ultrasonic cleaning needs for ceramic membrane to be put into
Special cleaning device, it is very inconvenient in this way in terms of engineer application, and will increase the cost of equipment.Electric field cleaning
Method: electric field ablution must use conductive film, and electrode is installed on ceramic membrane, so, the cost and dimension of whole equipment
Repairing expense can all improve.
A variety of cleaning processes are learnt from other's strong points to offset one's weaknesses, are combined by the present invention, can further improve the cleaning effect of ceramic membrane.
Summary of the invention
Technical problems to be solved by the inivention
The object of the present invention is to provide a kind of flue gas water capturing installation and ceramic membrane cleaning process based on ceramic membrane, solves
Water consumption is big in prior art, does not wash clean clearly and chemical dosage problem.Further improve moisturizing efficiency.
Method for solving technical problem
In view of the above-mentioned problems, the invention proposes a kind of flue gas water capturing installation based on ceramic membrane, including ceramic membrane unit,
Ceramic membrane unit has ceramic film component comprising: alternately backwash unit, low temperature process spray for chemical cleaning unit, gas-liquid
Unit, chemical cleaning unit is to clean ceramic film component front row severe fouling area；Alternately backwash unit is arranged in gas-liquid
On ceramic-film tube, to be backwashed to all ceramic film components；Low temperature process spray unit is mentioned to reduce flue-gas temperature
The degree of supersaturation of high water vapor.
According to the second aspect of the invention, a kind of cleaning device for catching ceramic water film for flue gas is provided comprising: chemistry
Cleaning unit, gas-liquid alternately backwash unit, low temperature process spray unit, and chemical cleaning unit is to ceramic film component front row
The cleaning of severe fouling area；Alternately backwash unit is arranged on the ceramic-film tube of ceramic film component gas-liquid, to all ceramics
Membrane module is backwashed；Low temperature process spray unit improves the degree of supersaturation of vapor to reduce flue-gas temperature.
A kind of embodiment is that pressure measuring element is installed before and after ceramic film component.
A kind of embodiment is that low temperature process spray unit includes cooling device and atomizer, and atomizer setting exists
Flue gas flows through in the flue before ceramic membrane unit.
According to the third aspect of the invention we, a kind of flue gas based on ceramic membrane is provided and catches hydraulic art comprising, low temperature process
Water sprays process, chemical cleaning procedure and solution-air alternately backwash process.
A kind of embodiment is to restrain for front-seat membrane module, Yao Caiyong chemical cleaning, adds cleaning agent in flushing water,
Cleaning agent is containing certain density high molecular polymer.
A kind of embodiment is the start and stop that entire chemical cleaning procedure rinses to be controlled by pressure difference, before ceramic film component
After install pressure measuring element.
A kind of embodiment is, after the completion of chemical cleaning procedure, starting backwash process uses compressed air pair first
Ceramic film component carries out blowback and sweeps, and is then backwashed.
A kind of embodiment is that flushing water first passes through cooling treatment equipment and is fully cooled.
A kind of embodiment is that process water sprays in process, sprays into flue after the advanced apparatus for supercooling cooling of process water.
Beneficial effects of the present invention
It solves the problems, such as that mechanical cleaning water consumption is big: depending merely on mechanical cleaning, particulate matter relatively stronger for adhesiveness,
Will just can be with by prolonged rinse, so, water consumption can also increase with it.
Solve the problems, such as that mechanical cleaning is not clean and chemical dosage: some dirty layer mechanical cleanings not can be removed,
Chemical cleaning method must be used, chemical cleaning method often results in the big problem of chemical cleaning solution dosage.
Solves the pollution problem to environment of small fine grained and sour gas in flue gas: the similar pipe of ceramic film component
Formula demister, in flue gas solid particulate matter and sour gas have by certain removal effect, but partial size is in 0.1~1 μ
Fine grained between m not can be removed, and emits the PM2.5 harm for having aggravated environment, contains the acidity such as HCl, H2SO4 in flue gas
Gas is emitted into atmosphere and increases a possibility that acid rain occurs；
Further increase the problem of ceramic film component is to vapor capture rate: flue gas is in a saturated state, but in flue gas
Vapor partial size it is small, vapor pass through ceramic film component when, the probability contacted with ceramic film component is captured several with regard to small
Rate is also small.
From the description of following exemplary embodiment, further characteristic of the invention will become obvious.
Detailed description of the invention
Fig. 1 is the composition figure and process flow chart of the application device.
Specific embodiment
An embodiment of the disclosure is specifically described below, but the disclosure is not limited to this.
Referring to Fig.1: flue gas forms the flue gas of vapo(u)rous state after FGD, captures vapor by membrane module, capture
Water, which enters, catches water recycling bins, and a part can be used for rinse water, be evacuated to flush box, the flushing of rest part and recycling by water pump
Technique make-up water of the water directly as FGD.By chemical cleaning and solution-air, alternately backwash collectively constitutes flusher, and chemistry is clear
It washes by the way that special cleaning agent is added, ceramic film component front row serious pollution area is cleaned, solution-air alternately backwashes, and passes through one
Constant-pressure, the pressure place air of temperature and flushing water rinse comprehensively.Low temperature process flusher is arranged in ceramic film component front, and
Low temperature process water and backwashing water will pass through low-temperature treatment plant, are equipped with pressure measuring element before and after ceramic film component, are used to
Control the start and stop of chemical cleaning.
The developing technique of invention is mainly made of three parts:
First part is chemical cleaning.Since particulate matter is mainly S, Ca, Mg compound in FGD exiting flue gas, wherein absolutely
Most of is CaSO4 and MgSO4, has very strong adhesiveness.Ceramic film component similar to tubular demister, a large amount of CaSO4,
The small fine grained such as MgSO4 will be adhered on ceramic film component, front-seat because contacting first with fine particle, be adhered to
Possibility is maximum, moreover, front-seat, once adhering to fine grained pollutant, subsequent fouling will be become easier to, basic 90%
CaSO4 and MgSO4, which can be concentrated, is attached on the former comb beams of ceramic film component.Simple mechanical cleaning compares this adhesiveness
Big dirty layer not can be removed, and restrain for front-seat membrane module, Yao Caiyong chemical cleaning method, set in the former arrangements of ceramic film component outer
Side blow is washed, and adds cleaning agent in flushing water, cleaning agent be containing certain density high molecular polymer, polymer mainly for
CaSO4 and MgSO4 dirt layer, a large amount of carboxyl in high molecular polymer contain lone pair electrons in substituted amide groups and sulfonic group
Oxygen atom, nitrogen-atoms and sulphur atom all complex reaction, calcium sulfate scale and calcium ion and sulfate ion can occur with calcium ion
Dissolution equilibrium in, cleaning agent declines calcium ion concentration, calcium sulfate scale constantly dissolves, and removes calcium sulfate scale to reach
Purpose.The start and stop entirely rinsed are controlled by pressure difference, pressure measuring element are installed before and after ceramic film component, and flushing is set and is opened
Dynamic pressure difference is △ P0, depending on unit nominal parameter and operating condition, range is arranged between 130pa~150pa, works as pottery
When pressure difference is more than △ P0 before and after porcelain membrane module, starts the outside cleaning of former rows, carry out the chemical prerinse in severe fouling area, with
This simultaneously, triple valve is opened to flushing water return water tank below ceramic film component, and the flushing water with cleaning agent and pollutant is received
Collect flushing water return water tank, prevents it from impacting to water water quality is caught.When differential pressure reaches △ P1 when front and back, stop chemical cleaning
Range is arranged between 80pa~95pa depending on unit practical operation situation in device, △ P1.Process of Chemical Cleaning, not only
The firm pollutant of fouling is cleaned up, additionally it is possible to reduce the consumption of flushing water in later period backwash process.
Second part is that solution-air alternately backwashes.Back purge system is arranged on all ceramic-film tubes, is filled to chemical cleaning
After setting stopping, ceramic film component lower end is sealed processing, is exactly that automatic lifting piston is set in ceramic-film tube lower end, is controlling
Setting starts after chemical cleaning terminates in logic processed, when sealing is completed, starts back purge system.Solution-air alternately backwashes
Process is as follows: the compressed air for passing first into certain pressure and temperature sweeps ceramic film component progress blowback, compressed air temperature
It for room temperature, is generally positively retained between 25 DEG C~30 DEG C, pressure can be promoted to 0.4~0.5MP, and purge time is according to the negative of unit
Depending on lotus and desulphurization system practical operation situation, settable range is in 40s~70s；After blowback is swept, it is passed through certain pressure
It with the flushing water of temperature, is comprehensively backwashed, flushing water first passes through cooling treatment equipment and is fully cooled, and cooling temperature is down to
20 DEG C hereinafter, boost in pressure is to 0.3~0.4MP, washing time is consistent with purge time, back purge system stop after 60s
Left and right, after catching water and rinsing pollutant near triple valve well, triple valve is opened to catch water tank.Cool down to flushing water
Processing makes the flushing water temperature of flushing far below flue-gas temperature, can have certain partial cooling effect to flue gas, with temperature
The degree of supersaturation of the reduction of degree, flue gas increases, and has the sour gas such as a large amount of vapor and HCl, H2SO4 in membrane module table
Face condensation, can increase the discharge caught water, while reducing sour gas to a certain extent.In addition to this, solution-air alternately recoils
Journey is washed, the cleaning of compressed air is first passed through, then cleaned with flushing water, reduces the dosage of flushing water.
Part III is setting low temperature process water flusher.3 meters of position introduces process water spray before ceramic film component
Device, the advanced apparatus for supercooling cooling of process water are spilt, temperature is down to 20 DEG C hereinafter, spraying into flow depending on exhaust gas volumn, FGD goes out
Mouth flue gas has been in steam-laden state, and the cooling water inflow of penetrating is depending on unit load and exhaust gas volumn, such as 60MW
Unit run under 80% or so load, spray into low temperature process water flow can be in 3~3.5t/h, the work of low temperature process water
With being exactly further to promote the degree of supersaturation of vapor in flue gas to flue gas cool-down.
Partial size is difficult to be removed in 0.1~1 μm of finely ground particles, is discharged into the dirt that PM2.5 has been aggravated in atmospheric environment
Dye.Ceramic film component can remove the solid particulate matter in flue gas similar to tubular demister to a certain extent, and CaSO4 etc. is small
Particle has very strong hydrophily, and in the state of vapor supersaturation, fine particle is easy to be activated to form core by vapor
Change center forms drop embryos on surface particles, these embryos continue to grow up to form big drop under supersaturated condition,
Drop containing particle thermophoresis, turbulent flow and the fluid drag the effects of under coalescence occur form bigger aggregate, make 0.1~1 μm
Particulate matter rise to 2 μm or more, when encountering ceramic film component be intercepted capture probability increase, reduce consolidating in flue gas
The direct emission of body fine particle, the effective harm for alleviating PM2.5；Flue-gas temperature further decreases, while can also improve cigarette
The condensation of sour gas in gas reduces the discharge amount of HCl, H2SO4 in flue gas, reduces a possibility that acid rain occurs.
The low temperature process water flusher that the present invention adds is in addition to solving small fine grained and sour gas in flue gas
Except emission problem, also have greatly improved to the water efficiency of catching of ceramic film component.Low temperature process water reduces flue-gas temperature, improves
Flue gas degree of supersaturation, vapor are undergone phase transition, and vapor starts largely to condense into droplet, and droplet is under hypersaturated state
It constantly grows up, is captured on ceramic film component, further improve ceramic film component catches water efficiency in conjunction with vapor.Example
Such as, a kind of low temperature process water sprinkling embodiment of process is that at 50 DEG C or so, vapor is in desulphurization system exit gas temperature
Saturation state is sprayed by low temperature process water, so that flue-gas temperature is declined 3~6 DEG C, while the vapor sprayed into further increases cigarette
The degree of supersaturation of vapor in gas.The present invention passes through the sprinkling of low temperature process water, reduces flue-gas temperature, improves vapor in flue gas
Degree of supersaturation, promote the particulate matters such as CaSO4, the MgSO4 of partial size less than 15 μm and grow up, then pass through ceramic film component
When, it is streamed along ceramic film component, under inertia force effect, the biggish particulate matter of partial size has higher probability and ceramic membrane group
Part is in contact, and then captured, to removal droplet of the partial size less than 15 μm, has significant effect.The particulate matter of these captures
It is adhered on ceramic film component, passes through ceramic membrane flusher, it is easy to it can remove, ceramic membrane tube wall is smooth, it rinses simply,
And flush efficiency is high.
Industrial applicibility
Mechanical cleaning technology is effectively combined by the application with chemical cleaning technique, that is, reduces the water consumption of mechanical cleaning
With the consumption of chemical, and the efficiency of cleaning is improved；It is alternately rinsed, is further increased using solution-air in backwash
Flush efficiency, meanwhile, it reduces and rinses water consumption.
The application use low-temp. spraying shine device, cool down to flue gas, further increase flue gas degree of supersaturation, have with
Under several effects: can promote 0.1~1 μm of fine particle and grow up, to be captured by membrane module, improve the harm of atmosphere PM2.5；Increase
The probability that big vapor is undergone phase transition, makes Water vapor condensation at droplet and constantly grows up, and is captured on membrane module, improves film
Component catches water efficiency；The coagulation for increasing sour gas captures sour gas and vapor together, reduces sour gas
Discharge amount.
This embodiment is merely preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of protection of the claims
Subject to.
Claims (10)
1. a kind of flue gas water capturing installation based on ceramic membrane, including ceramic membrane unit, ceramic membrane unit has ceramic film component,
It is characterized in that, comprising: alternately backwash unit, low temperature process spray unit, chemical cleaning unit are used for chemical cleaning unit, gas-liquid
To be cleaned to ceramic film component front row severe fouling area；Alternately backwash unit is arranged on ceramic-film tube gas-liquid, to institute
There is ceramic film component to be backwashed；Low temperature process spray unit improves the degree of supersaturation of vapor to reduce flue-gas temperature.
2. catching the cleaning device of ceramic water film for flue gas characterized by comprising chemical cleaning unit, gas-liquid alternately recoil
Unit, low temperature process spray unit are washed, chemical cleaning unit is to clean ceramic film component front row severe fouling area；Gas-liquid is handed over
It is arranged on the ceramic-film tube of ceramic film component for backwash unit, to be backwashed to all ceramic film components；Low temperature
Technique spray unit improves the degree of supersaturation of vapor to reduce flue-gas temperature.
3. device according to claim 1 or 2, wherein install pressure measuring element before and after ceramic film component.
4. device according to claim 1 or 2, wherein low temperature process spray unit includes cooling device and atomizer,
Atomizer is arranged in the flue before flue gas flows through ceramic membrane unit.
5. a kind of flue gas based on ceramic membrane catches hydraulic art, which is characterized in that including it is clear that low temperature process water sprays process, chemistry
Wash process and solution-air alternately backwash process.
6. technique according to claim 5, wherein restrained for front-seat membrane module, Yao Caiyong chemical cleaning, in flushing water
Cleaning agent is added, cleaning agent is containing high molecular polymer.
7. technique according to claim 5 or 6, wherein the start and stop that entire chemical cleaning procedure rinses are controlled by pressure difference,
Pressure measuring element is installed before and after ceramic film component.
8. the technique according to any one of claim 5-7, wherein after the completion of chemical cleaning procedure, starting backwash
Process carries out blowback to ceramic film component using compressed air first and sweeps, then backwashed.
9. the technique according to any one of claim 5-8, wherein it is sufficiently cold that flushing water first passes through cooling treatment equipment
But.
10. the technique according to any one of claim 5-9, wherein process water sprays in process, and process water first passes through cold
But flue is sprayed into after device cooling.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101934199A (en) * | 2010-06-13 | 2011-01-05 | 北京科泰兴达高新技术有限公司 | Offline reverse osmosis membrane cleaning equipment |
| CN107166367A (en) * | 2017-06-21 | 2017-09-15 | 华北电力大学 | A kind of fume afterheat and moisture recovery system based on ceramic membrane heat exchanger |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101934199A (en) * | 2010-06-13 | 2011-01-05 | 北京科泰兴达高新技术有限公司 | Offline reverse osmosis membrane cleaning equipment |
| CN107166367A (en) * | 2017-06-21 | 2017-09-15 | 华北电力大学 | A kind of fume afterheat and moisture recovery system based on ceramic membrane heat exchanger |
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