CN208130717U - A kind of hollow-fibre membrane gas cleaning plant dusty - Google Patents

Abstract

A kind of hollow-fibre membrane gas cleaning plant dusty forms filtering unit dusty with polytetrafluoroethylhollow hollow fiber membrane film wire boundling, membrane module head and a metal cage, multiple this units is formed filter array dusty.This array is mounted in gas air duct dusty, dust is filtered using the micropore on film wire surface, the gas treatment dusty that dustiness can be up to 50-100g/m3 is the clean gas of 1-50ug/m3 of dustiness, reaches ideal discharge.Back-blowing device is housed in dustless gas air duct, the ventilation capacity of film wire can be kept.

Description

A kind of hollow-fibre membrane gas cleaning plant dusty

Technical field

Dust filter unit is mainly used for discharging the dust-filtering in place and facility containing gas dusty, especially be used for The dedusting of the high dusty gas discharge industry such as power generation, cement, coking, waste incineration, smelting, boiler.

Background technique

By taking the equipment flue gas ash removal technology such as boiler as an example, the process of water film dedusting, bag-type dust to electrostatic precipitation experienced, Bag filter is returned to again now, new trend is cloth bag+electrostatic precipitation.

From on January 1st, 2004, country proposed more strict requirements to the discharge of flue dust and SO2.Flue dust highest Permission discharge quality concentration is 50mg/m3.From on November 1st, 2005, the power plant boiler that Beijing has been run then flue dust Discharge quality concentration only allows 30mg/m3.

Original four E field electrostatic precipitator is changed to five electric fields, six electric fields are also difficult to meet above-mentioned requirements.At the same time, The discharge standard of SO2 also correspondinglys increase.To reduce SO2 discharge, many power plant will use low-sulfur coal or corresponding desulfurization is taken to set It applies, declines so as to cause the efficiency of dust collection of electrostatic precipitator, particularly with silicon high in coal, the power plant of aluminium content, removed using electrostatic Dirt device processing soot emissions mass concentration environmental requirement is much not achieved, then industry start be by Retrofit of Electrostatic Precipitator Bag filter.

In recent years, with the development of filter cloth materials manufacturing technology, sack cleaner the intensity of filter cloth, high temperature resistant, corrosion resistant, It is wear-resisting etc. all to improve a lot.The soot emissions mass concentration of bag filter can control in 15~50mg/m3, It is widely used in the industries such as power plant, mine, metallurgy, chemical industry, cement, pharmacy, food, is set as the depollution of environment and Product recycling It is standby.

The advantages of newest progress is electric, bag hybrid technology, integrates two kinds of technologies of electrostatic and dust settling pocket, forms new work Mode, is expected to discharge and is reduced to 5--10mg/m3 or less.

But society is very high to this desired value, ideal discharge standard is 10ug/m3, also very distant apart from this target Far.

Existing bag-ty pe dust collection has had reached the upper limit of its processing capacity, it is desirable to increase substantially filter efficiency It is highly difficult.Although the appearance of cloth bag+electrostatic technique can be improved integral filter efficiency, but when due to electrostatic generator work High-concentrated ozone is generated, there is strong oxidation, cloth bag made of common chemical fibre is all difficult to persistently bear, weathering quickly.Reply The outlet of both of these problems is that searching filter efficiency is higher, windage is smaller, the stronger material of oxidation resistance.

Improve later is that compound one layer of PTFE plate membrane, this layer film are equivalent to again on the surface of Nomex, braiding filtrate Playing the role of " primary dusts layer ", material exchange is carried out in film surface, it just can be carried out effective filtering at the beginning of use, Saturating past dust declines to a great extent.Simultaneously because the non-stick of PTFE film, coefficient of friction are small, muffin meeting Automatic-falling, it is ensured that Equipment resistance is steady in a long-term, therefore has given full play to sack cleaner superiority, becomes more effective, windage lower filter material Material.The running resistance of usual this filter material is in 1000Pa or so.But PTFE plate membrane must have backing material that could work. The strainability of backing material itself is not so good as PTFE plate membrane；With backing material compound tense, bonding plane necessarily blocks many micro- Hole, so that whole porosity reduces.In addition, the thickness of PTFE plate membrane is minimum, it is only equivalent to one-dimensional " orifice plate ", without depth Network structure, in order to guarantee filter efficiency, micropore diameter can only be made small.The windage that the two factors result in composite material increases Add.

For these problems, it is necessary to propose it is a kind of it is more cheap, reliable, strainability is excellent, dust containing capacity is bigger, windage Lower solution, an approach for solving above-mentioned difficulties are：Directly adopt hollow-fibre membrane, especially PTFE doughnut Film.

PTFE hollow-fibre membrane uses pure polytetrafluoroethylene material, by extruding, drawing and forming, is made generally in diameter 1- The thin tube-like of 3mm, membrane micropore are elongated hole, and general width is 0.1um -0.3um, length 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, mean 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 6 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.

Since it is so, why in the market without such product, the also not no patent and report of this respect,

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.PTFE hollow-fibre membrane before this is all for doing water process Or gas-liquid separation, after 2014, there is the patent of Guo Shaohua, puts forward to use polytetrafluoroethylhollow hollow fiber membrane as air The application of dedusting, but its film wire used is also all directly to have continued to use water process film wire, is not exclusively used at air-borne dust The film wire of reason and corresponding parameter.

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 large-scale electricity Factory etc. high pollution industry fume treatment 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, the Guangdong wind and Developed at the present inventor and place prepare gas purification dusty dedicated poly- four Satisfactory gas purification dusty dedicated poly- four has been produced in the complete outfit of vinyl fluoride hollow-fibre membrane and process flow Vinyl fluoride hollow-fibre membrane product.By many experiments, it is found that it is applied to processing dusty, be expected to replace existing dust removing cloth Bag, becomes new filtering material dusty.Moreover, since polytetrafluoroethylene (PTFE) is pure material, can may be used also with 100% recycling Serious secondary pollution problem caused by can not being recycled to avoid a large amount of existing retired dust settling pockets.

Based on succeeding in developing for the dedicated polytetrafluoroethylhollow hollow fiber membrane of gas purification dusty, the same of windage can reduced When, gas purification dusty processing index is increased substantially 3000 times by 5-30mg/m3, reaches 10-100ug/m3 even 1-10ug/m3, it is shown that greatly application prospect.

Problem to be solved is the structure and scheme being designed correctly, by this polytetrafluoroethylhollow hollow fiber membrane new material On the specific location for installing the filtration treatment for being used in gas dusty.

Summary of the invention

For solve the problems, such as high temperature, the corrosive gas containing high concentration discharge dusty dust treatment and purification, solve poly- four Application mode problem of the vinyl fluoride hollow-fibre membrane in terms of gas purification processing dusty, the invention proposes hollow-fibre membranes Gas cleaning plant dusty, it is characterised in that：Polytetrafluoroethylhollow hollow fiber membrane film wire boundling, with membrane module head component film group Part；The membrane module is mounted in a metal cage；The polytetrafluoroethylhollow hollow fiber membrane film wire boundling and the metal cage Together constitute with filter element dusty；Multiple filter elements dusty form filter array dusty；Multiple high powder Dirt filter array is mounted in gas air duct dusty；Polytetrafluoroethylhollow hollow fiber membrane film wire surface directly with the height Gas dusty contact in dusty gas air duct；Pass through the filtered dust-free gas of polytetrafluoroethylhollow hollow fiber membrane film wire Body enters dustless gas air duct by the membrane module head.

Further, the polytetrafluoroethylhollow hollow fiber membrane film wire, material are polytetrafluoroethylene (PTFE)（PTFE）, film wire Diameter be 3mm---30mm, wall thickness be 0.2-3mm, the length is 200mm---10000mm, by the tetrafluoroethene The single membrane module of empty fiber membrane composition, film wire quantity are 20-1000.

Preferably, the polytetrafluoroethylhollow hollow fiber membrane is that a kind of dedicated polytetrafluoroethylene (PTFE) of air cleaning dusty is hollow Tunica fibrosa, film wire diameter are 10-20mm, and membrane fiber length is 1000-2500mm；The tetrafluoroethene hollow-fibre membrane composition Membrane module, film wire quantity be 20-200.

Further, a diameter of 50-200mm of the membrane module head, the mode for fixing film wire are:In one piece of metal plate Upper that the metal tubule equal with film wire head mouth quantity is housed, the outer diameter of the metal tubule is slightly larger than the internal diameter of the film wire, institute It states film wire to cover one by one on the metal tubule, be compressed with the coaxial packing ring of the metal tubule.

Further, the polytetrafluoroethylhollow hollow fiber membrane film wire boundling forms membrane module, feature with membrane module head It is：The firm distance of the film wire from each other is 5---10mm.

Further, for the dustless gas air duct intermittence to the membrane module head blowback pressure-air, the high pressure is empty The pressure of gas is 3-10 times of air pressure in the gas air duct dusty.

Further, for the membrane module in a metal cage, the making material of the metal cage is stainless steel material.

Detailed description of the invention

Attached drawing 1 is the assembling schematic diagram of an example of the filter element dusty.1 and 3 be the film respectively in figure Two membrane module heads of component；2 in figure be the film wire of hollow fiber film assembly；4 in figure be the metal cage.The film group Part is mounted in the metal cage.

One membrane module is possible to that two membrane module heads are made, it is also possible to the form of only one membrane module head is made, but It is that film wire can be installed into a metal cage by both forms.

Membrane module head may be made cylindrical, it is also possible to be made rectangle and annular or other shapes, but these shapes Film wire can be installed into a metal cage by formula.

Above-mentioned various possible deform belongs to the range that the present invention covers, in the various possible deformations provided in attached drawing A kind of special case.

Specific embodiment

Since polytetrafluoroethylhollow hollow fiber membrane is a kind of tubule material of softness, be made 1000---10000mm long when It waits, in the case where air-flow is blown, film wire will significantly wave, and many film wires will be wound, or even fracture, ask to solve this Topic, the present invention devise a metal cage, the film wire of membrane module are constrained in metal cage.Metal cage limits the activity of film wire Range supports, maintains the shape of membrane module, meanwhile, the large-mesh of metal cage will not hinder the flowing of gas dusty.Institute To select metal, it is because the temperature of gas dusty is all very high, is that common plastics cannot be born.Meanwhile it is many dusty Gas all contains the corrosive elements such as strong acid, highly basic, is used to that make the metal material of metal cage should be not in this regard, selected Become rusty Steel material.

Membrane module and metal cage have collectively constituted filter element dusty, and each filter element dusty is usually 1m- 2.5m long, the column of 120-200mm of diameter can accomplish 3m-8m long in large-scale processing equipment dusty, vertical to pacify Dress.

Multiple filter elements dusty form filter array dusty, according to different needs, composition array is dusty Filter element number is different, the array that large power plant is constituted available to 2000 filter elements dusty.

Filter array dusty is mounted in gas air duct dusty, and the dust in gas dusty thus passed through is high A large amount of film wires in dust-filtering array are intercepted, and only pure gas could pass through, and reach membrane module head, and membrane module is first End is ined succession film wire, and one end is ined succession dustless gas air duct, and filtered pure gas is discharged into subsequent workshop section.

In order to remove the ash cake of film wire surface accumulation, setting passes through membrane module head to film wire blowback from dustless gas air duct Process, when the air pressure of blowback be greater than gas air duct dusty in air pressure when, be attached to film wire surface most of ash cake and A part of particle in film wire will fall off, to restore the ventilation capacity of film wire.This technology is in traditional filter bag skill Have use in art, but to hollow-fibre membrane especially polytetrafluoroethylhollow hollow fiber membrane, further, gas especially dusty Body handles dedicated polytetrafluoroethylhollow hollow fiber membrane for the use in gas handling system dusty, this is unprecedented It attempts.With its novelty.

Since present apparatus object to be treated is containing gas dusty, the accumulation of dust can interfere ventilatory capacity, film Spacing distance between silk and film wire should be in 1---10mm or more, preferably in 5---10mm or more.This is also difference conventional film One feature of component.

Membrane module head in the present invention is different from traditional pouring type membrane module head, because in high temperature and high corrosion condition Under, traditional material for pouring, such as epoxy resin, polyurethane etc. is all difficult to bear.Along with polytetrafluoroethylene (PTFE) material Expect the non-stick of itself and these pour reliable connection of material under the conditions of high temperature, high corrosion with regard to highly difficult.For this purpose, this hair It is bright using mechanical connection by the way of.A series of metal tubes are fixed on a metal plate, the diameter of metal tube is slightly larger than film wire Internal diameter, using the elasticity of film wire, by the head muzzle of film wire on metal tube, then with the packing ring coaxial with metal tube by film wire Head oral area position compress.There are many kinds of class, colleagues to be readily apparent that details repeats no more for packing ring.

Different from traditional mode for fixing film wire on membrane module.Because the membrane tube diameter of traditional hollow-fibre membrane is very Small, there are many membrane tube quantity, and very high density, discomfort shares mechanical connection manner.And the dedicated hollow fiber film assembly of air cleaning The film wire diameter of use is all very thick, and generally in 5-30mm, film wire negligible amounts, generally 50-200, density is sparse, and ring Border temperature is very high, and the mode connected using thin metal pipe is more succinct, reliable, also facilitates the supplement and reparation of fracture film wire, is high Temperature, high corrosion, an important feature of gas purification dusty processing dedicated film component technology.Also there is its novelty.

Membrane module head can also be made with epoxy resin resistant to high temperature, polyurethane, inorganic adhesive etc. bonding agent, is realized It runs at high temperature.

Beneficial effect

1, by conventional filter bag dedusting, electrostatic precipitation, filter bag+electrostatic precipitator technology dust removing effects from 5-30mg/m3 substantially Degree is promoted to 1-10ug/m3, has reached perfect condition.

2, windage drops to 300---800Pa from 1000-2000Pa of conventional filter bag, saves a large amount of electric energy.

3, due to the blowback air-flow of polytetrafluoroethylene material itself not being covered with dust in performance and dustless gas air duct, It can ensure that filter array dusty is run for a long time.

Once 4, flue gas is processed into dustless gas, just for chemically or hollow-fibre membrane exchange process further absorbs Utility in processing flue gas opens road, and nitrogen oxides, sulfur dioxide just all become valuable resource.

5, due to the recuperability of polytetrafluoroethylene material, secondary pollution is avoided.

The present invention by the environment protection significance of generation, social effect, economic significance be apparent.

Claims (7)

1. a kind of hollow-fibre membrane gas cleaning plant dusty,

It is characterized in that：By polytetrafluoroethylhollow hollow fiber membrane film wire boundling, membrane module, the membrane module are formed with membrane module head It is mounted in a metal cage, the polytetrafluoroethylhollow hollow fiber membrane film wire boundling together constitutes with dusty with the metal cage Filter element, multiple filter elements dusty form filter array dusty, multiple filter array installations dusty In gas air duct dusty, polytetrafluoroethylhollow hollow fiber membrane film wire surface is directly and in the gas air duct dusty Gas dusty contact, the film group is passed through by the filtered dustless gas of the polytetrafluoroethylhollow hollow fiber membrane film wire Part head enters dustless gas air duct.

2. a kind of hollow-fibre membrane gas cleaning plant dusty according to claim 1, it is characterised in that：Described poly- four Vinyl fluoride hollow-fibre membrane film wire, material are polytetrafluoroethylene (PTFE)（PTFE）, the diameter of film wire is 3mm---30mm, wall thickness For 0.2-3mm, the length is 200mm---10000mm, the membrane module being made of the tetrafluoroethene hollow-fibre membrane, film Silk quantity is 20-1000.

3. a kind of hollow-fibre membrane gas cleaning plant dusty according to claim 2, it is characterised in that：Described poly- four Vinyl fluoride hollow-fibre membrane is a kind of dedicated polytetrafluoroethylhollow hollow fiber membrane of air cleaning dusty, and film wire diameter is 10- 20mm, membrane fiber length are 1000-2500mm；The membrane module of the tetrafluoroethene hollow-fibre membrane composition, film wire quantity are 20-200.

4. a kind of hollow-fibre membrane gas cleaning plant dusty according to claim 1, it is characterised in that：The film group A diameter of 50-the 200mm of part head, the mode for fixing film wire are:Equipped with equal with film wire head mouth quantity on one piece of metal plate Metal tubule, the outer diameter of the metal tubule are slightly larger than the internal diameter of the film wire, and the film wire is covered one by one in the metal tubule On, it is compressed with the coaxial packing ring of the metal tubule.

5. a kind of hollow-fibre membrane gas cleaning plant dusty according to claim 1, the polytetrafluoroethylene (PTFE) are hollow Fiber membrane yarn boundling forms membrane module with membrane module head, it is characterised in that：The spacing distance of the film wire from each other is 5---10mm。

6. a kind of hollow-fibre membrane gas cleaning plant dusty according to claim 1, it is characterised in that：It is described dustless For gas air duct intermittence to the membrane module head blowback pressure-air, the pressure of the pressure-air is the gas wind dusty 3-10 times of air pressure in road.

7. a kind of hollow-fibre membrane gas cleaning plant dusty according to claim 1, it is characterised in that：The metal The making material of cage is stainless steel material.