A kind of device handling gas dusty using hollow fiber film assembly
Fields
The device of gas dusty is handled using hollow fiber film assembly
Background technique
Gas dusty refers mainly to the typical discharge occasion dusty such as power generation, smelting, incineration plant, and work is in people
The atmosphere faced for vehicle, the house in, natural sandstorm environment.Dust content in these gases generally reaches 10---
The concentration of 1000g/m3.
Handle gas dusty common method be mechanical centrifugal dedusting, electrostatic precipitation, bag-type dust, strainer dedusting and
The mixing of these modes.But these modes all suffer from three common defects, first is that dust containing capacity is insufficient, it is difficult to be subjected to long-term height
The impact and accumulation of dust.Second is that filter efficiency is insufficient or unstable, it is difficult to which guarantee exports satisfactory pure air for a long time.
Third is that windage is excessively high, consumption energy is very big.For example, the present discharge standard in power plant is 30-50mg/m3, but generally use
Bag filter be extremely difficult to this standard, moreover, this standard itself is also unsatisfactory, the mark of social expectation
Standard is 30ug/m3, and there are also 1000 times of gaps.For another example armored vehicle can only walk tens kms under the conditions of sandstorm, just must
Must stop deashing, replace filter core.Air filter system on tank, the 3- of consumption of engine general power under nominal situation
5%, 20% is consumed under the conditions of blocking, vehicle can be made to lose ability.
Industry is all striving to find a kind of new material and method, to improve the efficiency of gas treatment dusty.Effort is sought
Ask more cheap, reliable, strainability is excellent, dust containing capacity is bigger, the lower solution of windage.
An approach for solving above-mentioned difficulties is: directlying adopt hollow-fibre membrane, especially PTFE hollow-fibre membrane.
PTFE hollow-fibre membrane uses pure polytetrafluoroethylene material, passes through extruding, drawing and forming.It is made generally in diameter 3-
The thin tube-like of 20mm, tube wall with a thickness of 0.5-5mm.Membrane micropore is elongated hole, and general width is 0.1um -0.3um, length
For 1---5um.
The performance of hollow fiber membrane surface and plate membrane are similar, but hollow-fibre membrane be it is three-dimensional, entire wall thickness is all
Reticular structure constitutes more careful interception depth, considerably reduces windage.
Hollow-fibre membrane inherently has considerable mechanical strength, does not need other materials as support, also just keeps away
The loss that porosity is generated during compound with other materials is exempted from.
Under same volume, specific surface area is 3---10 times of common dust settling pocket, this means that wind speed can reduce
3-10 times, to the time that extension air is passed through in film surface, there is very important meaning to filter efficiency is improved.Especially exist
In semi-dry desulphurization, the dust layer of filter bag surface contains the complete desulfurizing agent of unreacted, is equivalent to the effect of one " fixed bed ".
If filter bag surface dust layer thickness 2.0mm, filtration velocity 1m/min, then the time that dust-contained airflow passes through dust layer is 1.2s,
Significantly extend the time of desulphurization reaction.If wind speed further decreases, the desulphurization reaction time can be extended to 2 seconds --- 12 seconds, just
Abundant reaction can be able to achieve.
The flexibility of hollow-fibre membrane itself, the non-stick and water repellent on surface, oil repellent make muffin be difficult to durable attachment,
Be easy to by wind and shake voluntarily fall off, be significantly greatly increased material dust containing capacity and the sustainable working time.
For these reasons, it is reason to believe that polytetrafluoroethylhollow hollow fiber membrane is a kind of very potential new material,
It is entirely possible to accomplish something in terms of administering pollution dusty.
Even so, in the market but without such product, the patent and report of this respect can not retrieved yet.
Hollow-fibre membrane came across for 19th century, and prosperity is the 1980s.All unbearable 150 degree of common plastics left
Right high temperature, without enough mechanical strengths, sufficiently low windage, sufficiently large dust containing capacity is impossible to be used in fume treatment
In environment harsh in this way.Until the nineties in last century, polytetrafluoroethylhollow hollow fiber membrane occurs, first part of Guo Yuhai et al. system
Standby patent appears in 2012.However, until currently, the producer that can produce polytetrafluoroethylhollow hollow fiber membrane in batches is few,
Also only for the model of water process, the economic and technical norms such as its consistency, yield rate, cost are all very unsatisfactory.Up to date,
Also it does not come out dedicated for the dedicated film wire product of air-treatment.
Film wire for water and air processing is that two kinds of parameters differ great product, also has very big difference in manufacturing process
Not.Only when this material can walk out laboratory, and extensive, inexpensive, reliable and stable production may be implemented, for dusty
Processing is just possibly realized.
For these reasons, it is based particularly at the exhaust gas dust of polytetrafluoroethylhollow hollow fiber membrane based on hollow-fibre membrane
The technology or blank out of reason, can not find out any data.
Recently, it is special to prepare gas purification dusty for the Guangdong wind and Developed at the present inventor Guo Shao China and place
It is special to have produced satisfactory gas purification dusty for complete outfit and process flow with polytetrafluoroethylhollow hollow fiber membrane
With polytetrafluoroethylhollow hollow fiber membrane product.By many experiments, it is found that it is applied to processing dusty, be expected to replace existing
Dust-removal cloth-bag becomes new filtering material dusty.It moreover, can be with 100% time since polytetrafluoroethylene (PTFE) is pure material
It receives, serious secondary pollution problem caused by can also avoiding a large amount of existing retired dust settling pockets that from can not recycling.
Based on succeeding in developing for the dedicated polytetrafluoroethylhollow hollow fiber membrane of gas purification dusty, by gas purification dusty
The index of processing increased substantially under the conditions of lower windage by 5-30mg/m3 to 10-100ug/m3 even 1-10ug/m3 at
It is possible.
Problem to be solved is the hollow fiber film assembly structure and working method being designed correctly, by this polytetrafluoroethyl-ne
On the specific location for the filtration treatment that the installation of alkene hollow-fibre membrane new material is used in gas dusty.
Summary of the invention
For the purified treatment for solving the problems, such as more effective gas dusty, hollow-fibre membrane is used the invention proposes a kind of
Component handles the device of gas dusty, which is characterized in that the structure of 02 ontology of hollow fiber film assembly is:
One end of tuyere 2 is fixed on lower face plate 3, is fixed on the lower face plate 3 there are many array that tuyere 2 is constituted, in
Empty fiber membrane film wire 1 is fixed on the other end of the tuyere 2,
Shell 9 is fixed on the lower face plate 3, the middle part of the shell 9 is equipped with upper face plate 11, fills on the upper face plate 11
There are many array that gas nozzle 6 is constituted, each described gas nozzle 6 and tuyere 2 being mounted on the lower face plate
Upper end corresponds to one heart,
The shell 9 has been divided into upper steam chest 8 and lower chamber 5 by the upper face plate 11, opens on the locular wall of the lower chamber 5
There is air outlet 4, inlet suction port 10 be housed on the locular wall of the upper steam chest,
The lower part of the lower face plate 3 is equipped with metal cage 01, and the metal cage 01 forms the hollow-fibre membrane film wire 1
Boundling protection constrains in the encirclement of the metal cage 01,
A series of hollow fiber film assembly 02 of processing gases dusty is installed on one big card 04, structure
At 02 array of hollow fiber film assembly, the inlet suction port 10 of all hollow fiber film assemblies 02 is all grouped by height
Air pipe 03 is connected on air accumulator 06 through pulse valve 05, and the air accumulator 06 is connect by air inlet pipe 07 with air compressor,
The big card 04 is mounted in one big cabinet, and big cabinet is isolated into two parts up and down, is infused containing dusty gas
Enter the big lower box point, is filtered by the array of the hollow-fibre membrane film wire 1 composition, pure air passes through the tuyere
2, the array that the air outlet 4 forms is pooled to the big air outlet 08 of part on the big cabinet, is discharged,
When being gradually deposited at the dust accumulation on 1 surface of hollow-fibre membrane film wire and reaching a certain level, each 05 sequence of pulse valve
It opens, moment blows out pressure-air, blows into through the high-pressure air pipe 03, inlet suction port 10, upper chamber 8, gas nozzle 6, tuyere 2 hollow
In the inner hole of fiber membrane yarn 1, instantaneous pressure is formed, the dust accumulation being attached on 1 outer wall of hollow-fibre membrane film wire is blown off.
Further, the lower face plate 3 and the metal of upper face plate 11 or ceramics or high-temperature resistance plastice are made,
Mounting means of the tuyere 2 on the lower face plate 3 has threaded connection or high temperature glue bonding or the connection that presses,
Or one is made in the mode that the structure of the tuyere 2 and the structure of the lower face plate 3 are cast,
Mounting means of the gas nozzle 6 on the upper face plate 11 has threaded connection or high temperature glue bonding or the company of pressing
It connects,
Or one is made in the mode that the structure of the gas nozzle 6 and the structure of the upper face plate 11 are cast.
Further, the hollow-fibre membrane film wire 1, is polytetrafluoroethylhollow hollow fiber membrane.
Further, the diameter of the gas nozzle 6 is 3-10mm, and the diameter of the tuyere 2 is 3-12mm, and the two is with one heart just
Right, intermediate there are the gap of 3-20mm, high-voltage pulse air moment is blown into the tuyere 2 by the gas nozzle 6, thus enters
The inner hole of the hollow-fibre membrane film wire 1, the pressure of instantaneous pressure air are 0.05---0.5Mpa, pressure-air it is lasting when
Between be 0.5-5 seconds, interval time of high pressure air pulse is 10-180 seconds.
Further, the tuyere 2 and the connection type of the hollow-fibre membrane film wire 1 are: by the hollow-fibre membrane
1 set of the film wire end in the tuyere 2 is compressed with card or hoop or is bonded with high temperature resistant cement.
It further, is material by the side of the structure of the tuyere 2 and the casting of the structure of the lower face plate 3 with kirsite
One is made in formula,
Being material with kirsite is made one for the mode of the structure of the gas nozzle 6 and the casting of the structure of the upper face plate 11
Body.
Detailed description of the invention
Attached drawing [1] is a structure example figure an of the utility model.Scheme in [1], 1 is hollow-fibre membrane film wire 1;2
It is tuyere;3 be lower face plate;4 be air outlet;5 be lower chamber;6 be gas nozzle;8 be upper steam chest;9 be shell;10 be inlet suction port;
11 be upper face plate.
Attached drawing [2] is the peripheral components and installation relation schematic diagram of a utility model, and in figure [2], 1 is the high powder of processing
Hollow-fibre membrane film wire on the hollow fiber film assembly of dust and gas body;01 is the gold for constraining and protecting hollow-fibre membrane film wire
Belong to cage, when normal mounting, hollow-fibre membrane film wire boundling is installed in metal cage;04 is big card;02 is the high powder of processing
The hollow fiber film assembly of dust and gas body.
Attached drawing [3] is the section example schematic an of the utility model.It is above and below that big card is omitted in figure
Big cabinet.Scheme in [3], 2 be the end face for the tuyere seen from section;4 be the air outlet seen from section;02 is a series of
Handle the hollow fiber film assembly of gas dusty;03 is high-pressure air pipe;04 is big card;05 is a series of pulse valves;06 is
Air accumulator;07 is the air inlet pipe for connecting air compressor;10 be the inlet suction port seen from section;08 is big air outlet,
All membrane module outlet air collect the outlet of output on exactly big card.
Specific embodiment
In general, being to be poured with resin with the mode that membrane module is made in film wire boundling, but due to the work of processing dusty
Environment is the hot environment for being full of corrosive gas, temperature at 120 degree or more, and original mode has been not suitable for.Secondly, if
Certain root film wire is damaged, in the component poured, it is impossible to be individually replaced film wire.In view of this consideration, the specific side that the present invention uses
Method is a series of tuyeres to be fixed on card, or an entirety directly is made in the method that the two is cast, then film wire is consolidated
It is scheduled on tuyere.
The material selection principle of card and tuyere is high temperature resistant, corrosion-resistant, dimensionally stable.The material that can choose is common
Steel, stainless steel, aluminium, copper, kirsite, ceramics, high-temperature resistance plastice.
The design for such as selecting card to separate with tuyere, gas nozzle, the preferred stainless-steel sheet of card, tuyere, gas nozzle are preferably stainless
Tuyere, gas nozzle are fixed on card by steel steel tubule with riveting method.If selected, card ----tuyere, gas nozzle integration are set
Meter, preferably zinc-containing alloy, can be with one-step die casting.Followed by high-temperature resistance plastice.
Film wire is directly sleeved on tuyere, but needs to fix, and fixed mode has mechanical system and two kinds of chemical mode.Machine
Spring Card or pipe collar or screw-threaded coupling mode can be used in tool mode;Chemical mode is exactly to be bonded with high temperature resistant cement.
Corresponding with lower face plate is upper face plate, and upper face plate is to secure many gas nozzles, each gas nozzle respectively with lower face plate
On tuyere it is coaxially opposite, there is the spacing of 5-30mm in centre.
When unit is in filtration state, the gas containing volume of smoke is driven to form the air pressure of 1-2Kpa by blower,
It is applied to hollow-fibre membrane film wire outer surface, is filtered by the filter opening in film wire, dust is intercepted, and pure air is from doughnut
It is flowed out in the pore at film film wire center, enters lower chamber 5 by tuyere 2, the air-flow after hollow-fibre membrane cluster filter is in lower gas
Collect in room, flowed out by air outlet 4, going to is in the big cabinet of a sidewalls with big card, and a series of membrane modules 02 export
Air-flow again this converge, finally from big cabinet be discharged.
When unit is in deashing blowback state, pulse valve 05 is sequentially opened, and the high pressure draught of moment is exported, by high pressure
Tracheae 03 is assigned on each membrane module 02.High pressure draught enters the upper steam chest 8 of membrane module 02, and what is be further assigned is each
A gas nozzle 6, since gas nozzle 6 is that concentric face, high pressure draught will fling the center of hollow-fibre membrane film wire 1 one by one with windage 2,
Moment forms high pressure in the inner cavity of hollow-fibre membrane film wire, and the strength of blowback passes through the micropore on film wire wall, will be attached to film
Dust accumulation on silk outer wall is blown off, and film wire is made to restore permeability.
Although back-flushing technique is mature technology, the past is all only used in the doughnut of bag filter and water process
It on film, is still belonged to the first time on the hollow-fibre membrane boundling of filtering dust using blowback design, there is the technical problem of many uniquenesses to need
It solves.Such as the design of upper steam chest obviously has novelty and necessity, his effect is to evenly distribute air-flow, keeps air pressure
The steady and duration.This has apparent difference with the blowback mode that bag-type dust uses.
Beneficial effect
Traditional bag filter mostly uses just knoisphere muffin work principle of filter, that is, is used in the dust accumulation that surface of filter medium is formed
Layer filtering dust, with dust-filtering dust, the filter efficiency of cloth bag is extremely low before dust accumulation layer is formed, a large amount of dust escape.Dust accumulation
Windage is again very big after layer is formed, and causes power consumption very high.The invention avoids these problems, the micropore on film wire surface only has
0.1-0.5um inherently has excellent interception performance, does not depend on the formation of dust accumulation layer, that is to say, that hollow-fibre membrane
Work principle of filter is different from bag filter, is not in dust escape phenomenon.
Non-stick due to polytetrafluoroethylhollow hollow fiber membrane material itself, pressure and flow required for blowback are all very
It is small, it can be easy to restore permeability.
Also there is the technological innovation in bag filter surface coating, but plate membrane is necessarily required to support, the cost of support
It is significantly to lose porosity, what is finally obtained is that two kinds of materials mix as a result, polytetrafluoroethylene material cannot be given full play to
Advantage, the present invention directlys adopt the dedicated polytetrafluoroethylhollow hollow fiber membrane of air cleaning, avoids these drawbacks well.
Resistance to oxidation that pure polytetrafluoroethylene material has, corrosion-resistant effect for high ozone, highly corrosive gas ring
Also there is especially important meaning in border.
Experiment shows using the solution of the present invention, can be by filtrating smoke dust index from existing most stringent of 30---50mg/m
3 improve more than 1000 times, are easily reached the even higher level of 10---30ug/m3, this is a strategic major progress.Cause
It is not only the progress of dust-filtering for this, while is also the great opportunity for thoroughly dispelling gas pollutant in flue dust.Many institute's weeks
Know, handling pure flue gas with membrane absorption method is the technology of a relative maturity, only because containing a large amount of dust in flue gas, hinders
The popularization of this technology uses, once can be with easy method the dust processing in flue gas to inappreciable degree, film is inhaled
Receiving method desulphurization and denitration will be made available by feasible, and at that time, sulphur and nitre will be translates directly into chemical fertilizer, every hair by membrane absorption method
Power plant, smeltery, burn field simultaneously be exactly between chemical fertilizer factory, it is real 0 discharge be no longer a dream.