CA2237991A1 - Surface filtration and surface filter - Google Patents
Surface filtration and surface filter Download PDFInfo
- Publication number
- CA2237991A1 CA2237991A1 CA002237991A CA2237991A CA2237991A1 CA 2237991 A1 CA2237991 A1 CA 2237991A1 CA 002237991 A CA002237991 A CA 002237991A CA 2237991 A CA2237991 A CA 2237991A CA 2237991 A1 CA2237991 A1 CA 2237991A1
- Authority
- CA
- Canada
- Prior art keywords
- filter
- filter elements
- housing
- crude gas
- rinsing fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
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
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/04—Cleaning filters
-
- 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
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/48—Removing dust other than cleaning filters, e.g. by using collecting trays
-
- 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
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/69—Regeneration of the filtering material or filter elements inside the filter by means acting on the cake side without movement with respect to the filter elements, e.g. fixed nozzles
-
- 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
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/79—Regeneration of the filtering material or filter elements inside the filter by liquid process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/16—Plant or installations having external electricity supply wet type
Abstract
The invention relates to a method of operating a surface filter (1) with a housing (2), filter elements (5, 16) inside the housing, a crude gas inlet (3) and a purified gas outlet (4), and to a filter (1) for applying the method. In order to extend the range of possible uses of surface filters to include problematic applications, it is proposed that the filter (1) should be operated wet.
Description
New ~nt~ inn p~a 1, 7: 3 ~5-Surface Filtration and Surface Filter The ,..~ni<~n relates to a surface filter Witll the ch~e~ ics of the preamble ofPateQt Claim 1. F~lhe,~ , ~ the ill~ U~I re~ates to a process for worl~ng s~id surface filter.
Surface filtration serves for separation of dust, i.e. separation of particles from gases.
Separation of partictes occurs mostly on the surface of a filter ~i~ fabric or needle felting made of ~tural or synthetic fibers), which is formed, as a rule, by hose- or pocket-shaped filter f l- . ..- - n~ A so called dust cake forms on the surface of the filter element.
It constitutes the highly eff~tive ~ . ~ layer proper, iQ which takes place nearly total s,~A;~ n~l;Qn of particles and whicb ~,~ tbe filter ,~ from u,~,.~blo dust ~ -.. n and thus ~u..in~, clog8ing.
A~ a rewlt of th~ of dwt layer on the surface, lou of pressure CG..I..~C~ to~e. In order to o~ain s~ble operation of the filter, the filter cake needs to be~~o~c;l ~. Q~ y. With hose ~cd filter ol~ ls, ~ om the out~ide to the in~ide, ele~ , usually is donc in such fashion that via introd~ tiQ~ of co..~ e d air into the inte¢ior of the filter hose, excess pr~re is ge.~. ~-led, ~. h_. ~y flow Jir~oll of the gas ,~s itself and the dust cake located at the outside of the filter medium can be detached. A Pro-r~ *e for this i~ that the separation forces co~ing into play between filter ...~ . and dust cako are greator than the operative ~d'haion forces.
dunng operation of ~urface filters can, in e~ ~ ~n~r, occur under two aspects:
(revi~ed page) - clogginK of filter me~ Jnl by mesns of irrcv.,. ~ ~ le ~ ~bc~ 1 of p~icle~This is particl~larly noted in the p~ec~ 1 ;on of fine dusts (x, l ~lm) ~ ~b:~Adwith low co.~ a n~iO~ of crude gas removal~ , as a re~ult of finnly adhe~ing dust cakes This effect p. .,R ~' Iy occurs in s e ~ P~ t ;or of fine and/or sticky dusts and also when particles are separated from wet gases or with particle-droplet lluA.~unvs A surface filter ofthe here con~.-,ed type is known from US-A-25 13 174 A vertically ~, n~,~ d filter layer is located in a ho.~on~all~ l,a~,6.~d houcing Positioned immediately before the filter layer are ~o7~l~, which serve to jet-spray tho filter layer with a flushing fluid Since the effect of the n~771~q, located at a short distance in front of the filter layer, is locally restricted, a plurality of nozzles needs to be E~
Con~~ y, the de~ign ofthe filter bc~.~ s very costly, s,~,ev;l;~lly if rel~i~
Isrge filter areas must be r~ -1 ed Mofeo~er, stress is ~ due to the &ect jet-L~ ,, so that much wear and tesr occurs (~lltin8 ill low service life) The content~ of DE-A-27 31 755 is also part of state of the art It ~d il~s filters with ~ central, ~ ; 'Iy arrsnged filter candle, locatet in a cylintrical h-~ .o;~g The crude gas i8 lL~J'~AlU~ ~ nti-lly and ilows spirally around the filter cantle from the top towards th~ bottom As a result of a high L ~ y CG~ OG~,~t - agite from the ~edimaltation cause~d by the filter candle - a separation i8 obtained based OQ the C~rGIOnC principle In the p~nficqtinn of flue gases, which are produced during 1 ~ ~ ~i~
of MOS2, the crude gas is sprayed with water The pre~ent hl~e~tiOll is bll~et on the object of eyp~ the ap~ ion field of ~urface filters to include A;IT..~.~II app~ tion caseg.
(re~nscd page) U.J~ L L~ .7U J.U . U ~ rr~ l~U~-~lUUU rA.L ~ ''. U~L. ~ v_~
The particular benefits of the suRace filter ~ c ding to the invention and also of thc Gp~ lh~g process are based in that prior to crude gases colliding with the filter elernents, there occurs intensive b' ~ling of the crude gas with the d,opl~ of a finely di~per~ed mist. Consecuently, there occurs in this region a settling of the impuritie~
on the ~Iro~ '~ . A pe~ ~ a8e of these drops no longer reaches the fitter elements, so that there is a reductiQr. in dust a~ ~ ' ~ tion at the filter ç~ e- ~t ~ proper. Another ge of the i,-.~.J- i1:~ contained in the crude gas, which have already been blended with thc rnist, diroctly carries whh it the required rinsing fluid whon re ~ ~ ~E the crude gas side ofthe filter e~ for e~umple as nl-~ ~hinG) wbich assists in fl~ 3h;-~g the filter.
Blending of the finely dispersed fluid trops with the cmto gas In the filter housing also results in that the fluid drops cus reach all regions ofthe filter ...~A;..-.., so that erre~ cleanin~ is gu&~lt~d. Due to the fact that E~ l'mUI~ifm of dust at the filter e~ proper is reduced and that the~ filter elo ~ are conti~ o~ y _le d, it ispossible to ob~in stable o~aLon with long servicc life ofthe filter ~ccold,.,g to the invention. Llt~ )tion of o~,on fior ~ ~seq of additional IJ1 g via compressed air can bo waived, as a general rule.
The type of water ~ is of p-u L~ILr ~ C6~ th this pl ~g~, in~much ~s r~ te and highly u..ifv.~ ~ es of filter ,.,f~i~,," must be guaranteed. ~ doing so, fc",,,ati~,n of ~ filter calce must be pr~ tct, since ~ny potentially folu,ing filter cake would result in a distinct il~ e in the loss of p~ 3~ C, (Capillaly F~h~q~ n) which is 1~ - ec rt-'le for ellel~_t;c reasons. The classic, cake-forming filtration, as described above, ~ rure makesnosense~thwetopc~dtio~. Itis,lh~,fo~O, palLcul~l~ ~p.~riate to ~rrange relatiw to a ~wfaco filter having the characteristics i;AB to the preamble of Pstent Clsim 1, the filter e~ 1 s in tho upper srea of thc filtor housing and to ~Tange bdow tne filter elernel~ts the nozzle(~) Imt also the orifice of the clude gas ~upply lino.
(revisod page) U;~ O ~ r~ l'l~ llDUU r~ n~r~ D~l.
~d-lhi~n~lly, a certsin part of the fimction is attributablc to the rinsing fluid. w~ch is assumed by the dust cake in the conventional Lll~ at.on operation, i.e. to produce s~ ;o~ of the particle~ and to prevent the~r p - ave into the pure gas.
In many cases of industrial application one is faced with the object of also separa~ng the ~,r~~o lc c~ nP- -1s in ~ition to the impurities in particle-form. This possibi~'ity is ~u~-led with a wet v~ 4t~ surfaoe filter by sel~ 1ion of an sp~vp.;dle fluid or by sdded dosage of suitable ~ s. If, for .~ , milk of lune (CaO-sol~tior- in H20) is employed as nnsing ~luid, the possibility exists of also pre~ l ;~ S02, S03, HCI or HF in e d 3 on to the dust-like particles.
~elow, several possibilities will be ~pl~ined in more detai} based on eA~,-~Jlary d~ d in Figures 1 to 9, relative as to how the process can be d~ od - ~ee;r~JIy how the added dosage of rinsing fluid can be envi tal~g into ~ ~r dr~ation the de~..,.il,~,d re~ s well as naming ~d~ o be~,fil3 and details.
-Figures 1 to 3 rep,~ ~face fi~ters ~c~ ding to the invention with dosed filter hoses, -Figures 4 and 5 ,~,~e3~ surface filters ~nth open filter hor,es, -Figure 6 ~ cp.~ 9 ~ntc a su&ce fi~ter with filter c~ t,;dgc -Figure 7 1 ~ a !~,urface fi1ter: ~e for ~ .~ of moist gases -Figure 8 ,~pr~s ~ ~ a surface filter accG.di.lg to the invention with el~l-ic~
field s~ d ~rec;~;tation and .Figure9 ~ ts an applirPtinn embodiment for ernploying a surface filter desi~ed ac~,.lihlg, to the .n~ n isl a ~pray drying inct~ll ~tiQn ~ t r r~ ~ ~ ~ v ~ _ ~ ~ u ~ r o ~ r~ ~ v In the ~ , embodiment ~ di.~, to Figure 1 and in all other figures, the ~urface filter d i~ d accordi..g ~o the ~ .L.al is it~ ;r.ed with 1, its filter ho.";,~L5 with 2, the crude gss line with 3 and the pure ga~ line with 4. For Filter 1, P ~ c r~lin~ to Figure 1, there are provided as filter ~ , in the upper region of filter ~ JF'-~, 2, g~ do~
closed at thle bottom filter ho~es 5, which ue sprayed from bdow with nns~ng fluid.
For that pulpose there are arTanged, in the lower region of the filter hmlP;ng 27 one or several no7~ 6 ~binary no_zle or other suitable de~icer7~, which are ~"Lul by conveyor pump 8, ~ria line 7, with rinsing fluid and ~ia line 9 wit_ cou~ ~d ~7 (for example air). ~ me~ng- and ~ .ito.u~ truments are idc-~-;rc~
w~th 11 and 12.
During Gpe.~liOII, in the imm~i~e IJ-u~lty of the crude gas inlet 3, a very finedroplet spectrum is produ~, as ~ J~;d 3 -h ~ ;C~ y in Pigure 1. The finely c. ucd drops (typical ~t~ -,t~, ap~u ~ ',y lOO~m) follow the fiow of gas due to their low SPI;-..-,-~t..l;o.. velocity and reach the filter hoses 5 in the same m~nner as the p~ L~,les which are present in the crude gElS. Due to aimultanwJs sottling of p~li~les and water, and if fluit percentage is s~ t, a ~o~flowing suspension is produced, which runs offthe filter hoses and can be disch~rgcd from ~ou~n~ 2 vialock gate 13. Separa~ion of solid matter from rinshg fluid takes place in a sedimeQtation ba~n 14. The se~,~t~ rin~ng fluid is transpo ted to n~l!llDg fluld vessel 15, so that ~1~ by means of cycting i~ possi~
The ~ t benefit ofthe descri'oed process co.~ ~ in that by g~l~.alu~, the finelydi;~ L ~ ~ mist, there is assurance that the rinsing fluid, which is fdtere~ in the same manne~ as the solid matter particles, will rea¢h those regions of the filter medium fir~t, where locally high flow ~e~ t;~, prevait - and ttws bigh particlo flow ~ ~V;~;~5, which require a correspondingly high supply of rindng fluid. Due to this effect, a st~h;~ of v~ . UO r~ l~lo~slluuu r~l ;~n~rr. Dr.~~ u~ u OpCi.alhl~ behavior is attained. A positive effect of the a,.~ 1 of the binary nozzle 6 in the area of the crude gas inlee 3 consists in th~t here a pr~-s ~ of particles can take place v,ia ~ 1 at drops, which will, in ap~ v~- idte size, settle down in the filter ho-. ~\B 2, 50 that there is red~l~ion in the a~ m~ tion of dust at the filter hoses 5.
In the event that in a~ to the s~l~ tion of particlos, gP~ ~~ ~1~ofthe crude gas are also to be sc~5.~,5..l~, one snay uso an ~yl-,y~ e rinsing fluid for ehat purpose. Anothe~ possibility consists in that ~ . are added. Such tion may be done a .lill~.<,.lt loc~ionc It is of particular benefit if the ~d~litiQn of t~ is done at ~he crude gas inlet 3.
In the ~ ry embodirnerlt a ~ ~ _ ~g to Figure 2,the addition of the rinsing fluid ss made directly into the crude gas. For that purpose, a nozzle 6 with co,~e~ s~dingly narrow S~ Llg ang~e is inct~lle~ in such fi~shion in the cnude gas ~ne 3, ~hat tho flow of crude gas and the flow of r~llsing fluid are cou~1;Q~ql to each ~ther. This affords the ~ ;ty of ~5_t~ acploitation of the there attaiDable high relative V- IOf ~;- g ~h.__.. partides and ~o~l~ t-~ for 5~tl~m~ of part~cles at wster droplets.
Another v ~ on r~p~s the direct spraylng of the f~lter hoses 5, as d ~ x scheroa~cally in Figure 3. The nozzlo~ 6 are located in tho upper region of'~he filter housing. In such an ~u~v~,e-~ nozzles 6 of most varied c,~..~ may be employcd ~for e~c~mplo an annular DOZZIC, en~, ,lc)~,~ the hose). Since the rinsing fluid needs to be less findy ~ ~ tharl in the ~ e ..l.ofl; .. d~ C a cl;n~ to Figuros 1 and 2, ulwy nozzles n~y be ~ i7~ even with lower wa~er pressure. This has a podtive effoct upon the operating costs of thc inQt~ tic!~
In tne . ~ , " ~ ~ ~ c ~ to Figures 4 and ~, tho lower end~ of the U~ Y~ U~ 4llDl~o rA~ ~r~ l~rALL 4~ v~ ~
filter hoses are open. In r l~iti-~r~ the filling lo~el height of the suspension comprising rinsing fluid and so~ nt particles is COl~tl olled in such manner that the lower onds of the filtor hoses 5 cont~ o~Qly dip into tho suspension. With a surface filter ofthiQ type.
opc. ~ e ~ in normal f~shion, where the flow through the filter hoses 5 moves from the outside to the in_ide (Figure 4) there exists the benefit that fluid ~ m~l~ting on the l~ure gas side Ismall ~ o~ Y of rinsing fluid or suspension) can freely flow out. In addition, w~th a surface filter l with ~Iter hoses 5 open toward the bo~toTn there exists the po -;bi~ of ~ .n,~, ehe direction of filtration and to ~ e the filter hoses from- the inside toward the outside, as is 3,~ lly representod bn Figure 5. Since as a result ofthe t~E,.,t~ ;~h,j ~ ofthe hose interior there will occur no wall la~ses, o"ti...~..
on of rinsing fluid is guar~nteed. With this ~ariation it is also po~ to t~, the use of support b~ since the filter hose~ e stabilized by the excess pressure in the interior.
As m~ntiQ~ed initially, effoTts are made to operate Slter 1 with a'~ n-l cc,.. p.es3ed ur cloaning. ~ this instance one is not Limited to the USUrJI hose shape ~nth respec~ to the geo~ r of the filt~ ~ v-~ whose e ntial bene~it lies in its excellent cleaning abiLity, for ~ by intro~hlction of a pressure thn st. A pl~lit~ of ~iations are here conceiva~le, which c.~n be ~,~t;~ ~ with respect to degree of setimentation, pres3u~e loss and rinsing ~uid I~Ui~ nc~
Figure 6 shows in w~mplary filshion an arr~ngemont of filter ~,e~Q 16 in cartritge consbuction mode,. The filter housing 2 i~ fil1ed over its entire cross-~ on w~ tho filter motia. Beneath tho filte~r olementQ there iB nozzle 6, which, as in the , embodiment~ according to Figures 1 to 4, is 5upplied with = fluid and co...pn --~d gas. If'n~, ~nother nozzle 18 can be arrangod ~ e the fiker v ~ o 1 .~ . v o r A~ l ~ l U ~ ~ l l U U U r ~ l ~r c or.~ v ~ ~J
elo~ which is operatod dther con~tantly o~ t~.lll.t~ ly. Above the filter discs there is a droplet CollD~l~or 17, which retains entrained rinsing fluid. As ~ iol~ed carlier, since cakc-forming filtration in wet op.,. alion is not possiblc because of c~.c. ~lic rea~ons, it is of benefit to s~ntch over to the principle of depth filtration and to employ ~p~o~l ;ate media. The structure ofthc individual filter c~ 16 may hcreby dii~cr in adjus~ent to the dust con~ Lon which de~,-.,Lscs from the bottom toward the top and ~he variable particle size ~ ib!~l;on An~ther ~ .lio-- exists with rospect to the object of the rsnsing fluid if the purifiable gas has ~ nt moi~re con~nt Undor the~e co~ l~;o~, it is appro~ te to arr~nge in the gas line 3 a condcnsa~ion phase 21 (~ ~ p~ ~ Figure 7). In thiq phase, particlo ~
c~n be obta~ned by k~t~,r~ nrl~nqation. l'his of~ers b w,~s fiom two D~C
I:ir~ly, thc in~ o in partide mass produces irnpro~e.~ in particle 9~;..1~ io~ based on higher inertia effec~. Secondly, the insing liquid demand is - .~ ' - d to the system, at least partially, by tho particles bound within the J~ . and reaches the fflter ,..~ li.--..
directly without any wall 109s. Dcp~r.~ g upon nee4 nozzles 6 may bo ammged n~lly to asgigt in the solid rnatter - 1 13C
It iq known from numorous tcsts that the se&~ 1 ;on boha~qor of filt-~nnG co~lectors cam clearly be i~Uy~J.~ by ~ ti~n of electrical forces. Figure 8 .~ s y a possibility of ho~v this can be rel';7ed w~th a wet GpL.~Icd surface filter 1 of the type ~ c ? ~;ng, to the invention. Spray cle~vdes are mowlted ~h.-e~:~ the grounded hoses 5, at whid~, when a ~ high tensions is ~pp' ~d, ch~rge canièrs are rele-re~, which lead~ to charging ofthe particles. The charged p~rticlcs ~ b'y move along the fidd lines, which ~e poled from the spray elc~odc~ to the fllter hoses, and a~e settled there .
v.~ 1 vv ~ .~ . vo r~ l~lU~ llU~ r~l J~nr~ OC.~ y v~
A~)p~ ,t;orl possibilities for tho proceas accor~ g to thc i..~ ion ~A,xist in ~ Cth'~
where f~ne and/or sticky du~s or dust~roplet n~ u.4s must be p~ , ~ and wbere l~tit;7A-tiQn of c~ hose filters or also wet washers is not ~ le ~a e~ use of ~ . ~3 or ecoi~n~ c reasons. In ~ iti~n, the cO~inuous, ~ rlin~ of the filtercd by the in~on is of benefit in ~he recovery of perishsble products or in regard to such prc ~ ~ ~ wbere ~ue.ltl~ chA~ g products are to be settled.
To cite by way of ~npl - separation of blue vapor and con~lr~ls tion e çrcsols from the exhaust air ~om ah~dd_~, mdting r~" - e s, fuui~;cs, in the manuf~cture of particle board sheet.
- product fec~ ;on in the ph~ --~Iti~'.PI industry or behind spray dryers in the food indus~r (cocoa, sugar, mi~ powder, etc.).
Figure g depicts in ~ p1~ y falshion a possible application of tbe i"~ lion in the spray drying l~rc ~ ss it can be found, for ~ 4 in the prod~ on of rniL~c powder. The spray dJyer 24 is 3~-p~ Vith the to be tried products from the wet product c~ r rnain 25 and w~h air, passed via a gas heatcr 26. Dry protuct is .li~h~e,_d via valve 27. The moist drying air, loaded with solid matter, ~
the down-stream filter 1 via the crude gas line 3 . As a result of the c4ntin~10~1s rinsing of hoses 5, therc is assursncc of reliable . ---' b- ofthe sepsrated product, even with bigh te~ of moistures, so that even with irregul~rities in the o~, nlion of the dryer, high G~alii~ s~lfety of the filter prevail~.
U~ 0 ~ . V~ rA~ 1 ~lO~ UUU r~l i~n~nrr o~.~ v ~,v The ~lid matter which is diuharged with the rinsing flu~d csn be t~lln~h-ced inso the pn~cess with this m~hod To that end, tho sedimen~ion basin 14 is oo~
~a line 28 to ~..~eJor pwnp 28 wish the wet product u~ tor ~nain 25. The beneSt of this ~tep con~sts in that trea~,l.ent of discharge w~ter can be eliminated.
Surface filtration serves for separation of dust, i.e. separation of particles from gases.
Separation of partictes occurs mostly on the surface of a filter ~i~ fabric or needle felting made of ~tural or synthetic fibers), which is formed, as a rule, by hose- or pocket-shaped filter f l- . ..- - n~ A so called dust cake forms on the surface of the filter element.
It constitutes the highly eff~tive ~ . ~ layer proper, iQ which takes place nearly total s,~A;~ n~l;Qn of particles and whicb ~,~ tbe filter ,~ from u,~,.~blo dust ~ -.. n and thus ~u..in~, clog8ing.
A~ a rewlt of th~ of dwt layer on the surface, lou of pressure CG..I..~C~ to~e. In order to o~ain s~ble operation of the filter, the filter cake needs to be~~o~c;l ~. Q~ y. With hose ~cd filter ol~ ls, ~ om the out~ide to the in~ide, ele~ , usually is donc in such fashion that via introd~ tiQ~ of co..~ e d air into the inte¢ior of the filter hose, excess pr~re is ge.~. ~-led, ~. h_. ~y flow Jir~oll of the gas ,~s itself and the dust cake located at the outside of the filter medium can be detached. A Pro-r~ *e for this i~ that the separation forces co~ing into play between filter ...~ . and dust cako are greator than the operative ~d'haion forces.
dunng operation of ~urface filters can, in e~ ~ ~n~r, occur under two aspects:
(revi~ed page) - clogginK of filter me~ Jnl by mesns of irrcv.,. ~ ~ le ~ ~bc~ 1 of p~icle~This is particl~larly noted in the p~ec~ 1 ;on of fine dusts (x, l ~lm) ~ ~b:~Adwith low co.~ a n~iO~ of crude gas removal~ , as a re~ult of finnly adhe~ing dust cakes This effect p. .,R ~' Iy occurs in s e ~ P~ t ;or of fine and/or sticky dusts and also when particles are separated from wet gases or with particle-droplet lluA.~unvs A surface filter ofthe here con~.-,ed type is known from US-A-25 13 174 A vertically ~, n~,~ d filter layer is located in a ho.~on~all~ l,a~,6.~d houcing Positioned immediately before the filter layer are ~o7~l~, which serve to jet-spray tho filter layer with a flushing fluid Since the effect of the n~771~q, located at a short distance in front of the filter layer, is locally restricted, a plurality of nozzles needs to be E~
Con~~ y, the de~ign ofthe filter bc~.~ s very costly, s,~,ev;l;~lly if rel~i~
Isrge filter areas must be r~ -1 ed Mofeo~er, stress is ~ due to the &ect jet-L~ ,, so that much wear and tesr occurs (~lltin8 ill low service life) The content~ of DE-A-27 31 755 is also part of state of the art It ~d il~s filters with ~ central, ~ ; 'Iy arrsnged filter candle, locatet in a cylintrical h-~ .o;~g The crude gas i8 lL~J'~AlU~ ~ nti-lly and ilows spirally around the filter cantle from the top towards th~ bottom As a result of a high L ~ y CG~ OG~,~t - agite from the ~edimaltation cause~d by the filter candle - a separation i8 obtained based OQ the C~rGIOnC principle In the p~nficqtinn of flue gases, which are produced during 1 ~ ~ ~i~
of MOS2, the crude gas is sprayed with water The pre~ent hl~e~tiOll is bll~et on the object of eyp~ the ap~ ion field of ~urface filters to include A;IT..~.~II app~ tion caseg.
(re~nscd page) U.J~ L L~ .7U J.U . U ~ rr~ l~U~-~lUUU rA.L ~ ''. U~L. ~ v_~
The particular benefits of the suRace filter ~ c ding to the invention and also of thc Gp~ lh~g process are based in that prior to crude gases colliding with the filter elernents, there occurs intensive b' ~ling of the crude gas with the d,opl~ of a finely di~per~ed mist. Consecuently, there occurs in this region a settling of the impuritie~
on the ~Iro~ '~ . A pe~ ~ a8e of these drops no longer reaches the fitter elements, so that there is a reductiQr. in dust a~ ~ ' ~ tion at the filter ç~ e- ~t ~ proper. Another ge of the i,-.~.J- i1:~ contained in the crude gas, which have already been blended with thc rnist, diroctly carries whh it the required rinsing fluid whon re ~ ~ ~E the crude gas side ofthe filter e~ for e~umple as nl-~ ~hinG) wbich assists in fl~ 3h;-~g the filter.
Blending of the finely dispersed fluid trops with the cmto gas In the filter housing also results in that the fluid drops cus reach all regions ofthe filter ...~A;..-.., so that erre~ cleanin~ is gu&~lt~d. Due to the fact that E~ l'mUI~ifm of dust at the filter e~ proper is reduced and that the~ filter elo ~ are conti~ o~ y _le d, it ispossible to ob~in stable o~aLon with long servicc life ofthe filter ~ccold,.,g to the invention. Llt~ )tion of o~,on fior ~ ~seq of additional IJ1 g via compressed air can bo waived, as a general rule.
The type of water ~ is of p-u L~ILr ~ C6~ th this pl ~g~, in~much ~s r~ te and highly u..ifv.~ ~ es of filter ,.,f~i~,," must be guaranteed. ~ doing so, fc",,,ati~,n of ~ filter calce must be pr~ tct, since ~ny potentially folu,ing filter cake would result in a distinct il~ e in the loss of p~ 3~ C, (Capillaly F~h~q~ n) which is 1~ - ec rt-'le for ellel~_t;c reasons. The classic, cake-forming filtration, as described above, ~ rure makesnosense~thwetopc~dtio~. Itis,lh~,fo~O, palLcul~l~ ~p.~riate to ~rrange relatiw to a ~wfaco filter having the characteristics i;AB to the preamble of Pstent Clsim 1, the filter e~ 1 s in tho upper srea of thc filtor housing and to ~Tange bdow tne filter elernel~ts the nozzle(~) Imt also the orifice of the clude gas ~upply lino.
(revisod page) U;~ O ~ r~ l'l~ llDUU r~ n~r~ D~l.
~d-lhi~n~lly, a certsin part of the fimction is attributablc to the rinsing fluid. w~ch is assumed by the dust cake in the conventional Lll~ at.on operation, i.e. to produce s~ ;o~ of the particle~ and to prevent the~r p - ave into the pure gas.
In many cases of industrial application one is faced with the object of also separa~ng the ~,r~~o lc c~ nP- -1s in ~ition to the impurities in particle-form. This possibi~'ity is ~u~-led with a wet v~ 4t~ surfaoe filter by sel~ 1ion of an sp~vp.;dle fluid or by sdded dosage of suitable ~ s. If, for .~ , milk of lune (CaO-sol~tior- in H20) is employed as nnsing ~luid, the possibility exists of also pre~ l ;~ S02, S03, HCI or HF in e d 3 on to the dust-like particles.
~elow, several possibilities will be ~pl~ined in more detai} based on eA~,-~Jlary d~ d in Figures 1 to 9, relative as to how the process can be d~ od - ~ee;r~JIy how the added dosage of rinsing fluid can be envi tal~g into ~ ~r dr~ation the de~..,.il,~,d re~ s well as naming ~d~ o be~,fil3 and details.
-Figures 1 to 3 rep,~ ~face fi~ters ~c~ ding to the invention with dosed filter hoses, -Figures 4 and 5 ,~,~e3~ surface filters ~nth open filter hor,es, -Figure 6 ~ cp.~ 9 ~ntc a su&ce fi~ter with filter c~ t,;dgc -Figure 7 1 ~ a !~,urface fi1ter: ~e for ~ .~ of moist gases -Figure 8 ,~pr~s ~ ~ a surface filter accG.di.lg to the invention with el~l-ic~
field s~ d ~rec;~;tation and .Figure9 ~ ts an applirPtinn embodiment for ernploying a surface filter desi~ed ac~,.lihlg, to the .n~ n isl a ~pray drying inct~ll ~tiQn ~ t r r~ ~ ~ ~ v ~ _ ~ ~ u ~ r o ~ r~ ~ v In the ~ , embodiment ~ di.~, to Figure 1 and in all other figures, the ~urface filter d i~ d accordi..g ~o the ~ .L.al is it~ ;r.ed with 1, its filter ho.";,~L5 with 2, the crude gss line with 3 and the pure ga~ line with 4. For Filter 1, P ~ c r~lin~ to Figure 1, there are provided as filter ~ , in the upper region of filter ~ JF'-~, 2, g~ do~
closed at thle bottom filter ho~es 5, which ue sprayed from bdow with nns~ng fluid.
For that pulpose there are arTanged, in the lower region of the filter hmlP;ng 27 one or several no7~ 6 ~binary no_zle or other suitable de~icer7~, which are ~"Lul by conveyor pump 8, ~ria line 7, with rinsing fluid and ~ia line 9 wit_ cou~ ~d ~7 (for example air). ~ me~ng- and ~ .ito.u~ truments are idc-~-;rc~
w~th 11 and 12.
During Gpe.~liOII, in the imm~i~e IJ-u~lty of the crude gas inlet 3, a very finedroplet spectrum is produ~, as ~ J~;d 3 -h ~ ;C~ y in Pigure 1. The finely c. ucd drops (typical ~t~ -,t~, ap~u ~ ',y lOO~m) follow the fiow of gas due to their low SPI;-..-,-~t..l;o.. velocity and reach the filter hoses 5 in the same m~nner as the p~ L~,les which are present in the crude gElS. Due to aimultanwJs sottling of p~li~les and water, and if fluit percentage is s~ t, a ~o~flowing suspension is produced, which runs offthe filter hoses and can be disch~rgcd from ~ou~n~ 2 vialock gate 13. Separa~ion of solid matter from rinshg fluid takes place in a sedimeQtation ba~n 14. The se~,~t~ rin~ng fluid is transpo ted to n~l!llDg fluld vessel 15, so that ~1~ by means of cycting i~ possi~
The ~ t benefit ofthe descri'oed process co.~ ~ in that by g~l~.alu~, the finelydi;~ L ~ ~ mist, there is assurance that the rinsing fluid, which is fdtere~ in the same manne~ as the solid matter particles, will rea¢h those regions of the filter medium fir~t, where locally high flow ~e~ t;~, prevait - and ttws bigh particlo flow ~ ~V;~;~5, which require a correspondingly high supply of rindng fluid. Due to this effect, a st~h;~ of v~ . UO r~ l~lo~slluuu r~l ;~n~rr. Dr.~~ u~ u OpCi.alhl~ behavior is attained. A positive effect of the a,.~ 1 of the binary nozzle 6 in the area of the crude gas inlee 3 consists in th~t here a pr~-s ~ of particles can take place v,ia ~ 1 at drops, which will, in ap~ v~- idte size, settle down in the filter ho-. ~\B 2, 50 that there is red~l~ion in the a~ m~ tion of dust at the filter hoses 5.
In the event that in a~ to the s~l~ tion of particlos, gP~ ~~ ~1~ofthe crude gas are also to be sc~5.~,5..l~, one snay uso an ~yl-,y~ e rinsing fluid for ehat purpose. Anothe~ possibility consists in that ~ . are added. Such tion may be done a .lill~.<,.lt loc~ionc It is of particular benefit if the ~d~litiQn of t~ is done at ~he crude gas inlet 3.
In the ~ ry embodirnerlt a ~ ~ _ ~g to Figure 2,the addition of the rinsing fluid ss made directly into the crude gas. For that purpose, a nozzle 6 with co,~e~ s~dingly narrow S~ Llg ang~e is inct~lle~ in such fi~shion in the cnude gas ~ne 3, ~hat tho flow of crude gas and the flow of r~llsing fluid are cou~1;Q~ql to each ~ther. This affords the ~ ;ty of ~5_t~ acploitation of the there attaiDable high relative V- IOf ~;- g ~h.__.. partides and ~o~l~ t-~ for 5~tl~m~ of part~cles at wster droplets.
Another v ~ on r~p~s the direct spraylng of the f~lter hoses 5, as d ~ x scheroa~cally in Figure 3. The nozzlo~ 6 are located in tho upper region of'~he filter housing. In such an ~u~v~,e-~ nozzles 6 of most varied c,~..~ may be employcd ~for e~c~mplo an annular DOZZIC, en~, ,lc)~,~ the hose). Since the rinsing fluid needs to be less findy ~ ~ tharl in the ~ e ..l.ofl; .. d~ C a cl;n~ to Figuros 1 and 2, ulwy nozzles n~y be ~ i7~ even with lower wa~er pressure. This has a podtive effoct upon the operating costs of thc inQt~ tic!~
In tne . ~ , " ~ ~ ~ c ~ to Figures 4 and ~, tho lower end~ of the U~ Y~ U~ 4llDl~o rA~ ~r~ l~rALL 4~ v~ ~
filter hoses are open. In r l~iti-~r~ the filling lo~el height of the suspension comprising rinsing fluid and so~ nt particles is COl~tl olled in such manner that the lower onds of the filtor hoses 5 cont~ o~Qly dip into tho suspension. With a surface filter ofthiQ type.
opc. ~ e ~ in normal f~shion, where the flow through the filter hoses 5 moves from the outside to the in_ide (Figure 4) there exists the benefit that fluid ~ m~l~ting on the l~ure gas side Ismall ~ o~ Y of rinsing fluid or suspension) can freely flow out. In addition, w~th a surface filter l with ~Iter hoses 5 open toward the bo~toTn there exists the po -;bi~ of ~ .n,~, ehe direction of filtration and to ~ e the filter hoses from- the inside toward the outside, as is 3,~ lly representod bn Figure 5. Since as a result ofthe t~E,.,t~ ;~h,j ~ ofthe hose interior there will occur no wall la~ses, o"ti...~..
on of rinsing fluid is guar~nteed. With this ~ariation it is also po~ to t~, the use of support b~ since the filter hose~ e stabilized by the excess pressure in the interior.
As m~ntiQ~ed initially, effoTts are made to operate Slter 1 with a'~ n-l cc,.. p.es3ed ur cloaning. ~ this instance one is not Limited to the USUrJI hose shape ~nth respec~ to the geo~ r of the filt~ ~ v-~ whose e ntial bene~it lies in its excellent cleaning abiLity, for ~ by intro~hlction of a pressure thn st. A pl~lit~ of ~iations are here conceiva~le, which c.~n be ~,~t;~ ~ with respect to degree of setimentation, pres3u~e loss and rinsing ~uid I~Ui~ nc~
Figure 6 shows in w~mplary filshion an arr~ngemont of filter ~,e~Q 16 in cartritge consbuction mode,. The filter housing 2 i~ fil1ed over its entire cross-~ on w~ tho filter motia. Beneath tho filte~r olementQ there iB nozzle 6, which, as in the , embodiment~ according to Figures 1 to 4, is 5upplied with = fluid and co...pn --~d gas. If'n~, ~nother nozzle 18 can be arrangod ~ e the fiker v ~ o 1 .~ . v o r A~ l ~ l U ~ ~ l l U U U r ~ l ~r c or.~ v ~ ~J
elo~ which is operatod dther con~tantly o~ t~.lll.t~ ly. Above the filter discs there is a droplet CollD~l~or 17, which retains entrained rinsing fluid. As ~ iol~ed carlier, since cakc-forming filtration in wet op.,. alion is not possiblc because of c~.c. ~lic rea~ons, it is of benefit to s~ntch over to the principle of depth filtration and to employ ~p~o~l ;ate media. The structure ofthc individual filter c~ 16 may hcreby dii~cr in adjus~ent to the dust con~ Lon which de~,-.,Lscs from the bottom toward the top and ~he variable particle size ~ ib!~l;on An~ther ~ .lio-- exists with rospect to the object of the rsnsing fluid if the purifiable gas has ~ nt moi~re con~nt Undor the~e co~ l~;o~, it is appro~ te to arr~nge in the gas line 3 a condcnsa~ion phase 21 (~ ~ p~ ~ Figure 7). In thiq phase, particlo ~
c~n be obta~ned by k~t~,r~ nrl~nqation. l'his of~ers b w,~s fiom two D~C
I:ir~ly, thc in~ o in partide mass produces irnpro~e.~ in particle 9~;..1~ io~ based on higher inertia effec~. Secondly, the insing liquid demand is - .~ ' - d to the system, at least partially, by tho particles bound within the J~ . and reaches the fflter ,..~ li.--..
directly without any wall 109s. Dcp~r.~ g upon nee4 nozzles 6 may bo ammged n~lly to asgigt in the solid rnatter - 1 13C
It iq known from numorous tcsts that the se&~ 1 ;on boha~qor of filt-~nnG co~lectors cam clearly be i~Uy~J.~ by ~ ti~n of electrical forces. Figure 8 .~ s y a possibility of ho~v this can be rel';7ed w~th a wet GpL.~Icd surface filter 1 of the type ~ c ? ~;ng, to the invention. Spray cle~vdes are mowlted ~h.-e~:~ the grounded hoses 5, at whid~, when a ~ high tensions is ~pp' ~d, ch~rge canièrs are rele-re~, which lead~ to charging ofthe particles. The charged p~rticlcs ~ b'y move along the fidd lines, which ~e poled from the spray elc~odc~ to the fllter hoses, and a~e settled there .
v.~ 1 vv ~ .~ . vo r~ l~lU~ llU~ r~l J~nr~ OC.~ y v~
A~)p~ ,t;orl possibilities for tho proceas accor~ g to thc i..~ ion ~A,xist in ~ Cth'~
where f~ne and/or sticky du~s or dust~roplet n~ u.4s must be p~ , ~ and wbere l~tit;7A-tiQn of c~ hose filters or also wet washers is not ~ le ~a e~ use of ~ . ~3 or ecoi~n~ c reasons. In ~ iti~n, the cO~inuous, ~ rlin~ of the filtercd by the in~on is of benefit in ~he recovery of perishsble products or in regard to such prc ~ ~ ~ wbere ~ue.ltl~ chA~ g products are to be settled.
To cite by way of ~npl - separation of blue vapor and con~lr~ls tion e çrcsols from the exhaust air ~om ah~dd_~, mdting r~" - e s, fuui~;cs, in the manuf~cture of particle board sheet.
- product fec~ ;on in the ph~ --~Iti~'.PI industry or behind spray dryers in the food indus~r (cocoa, sugar, mi~ powder, etc.).
Figure g depicts in ~ p1~ y falshion a possible application of tbe i"~ lion in the spray drying l~rc ~ ss it can be found, for ~ 4 in the prod~ on of rniL~c powder. The spray dJyer 24 is 3~-p~ Vith the to be tried products from the wet product c~ r rnain 25 and w~h air, passed via a gas heatcr 26. Dry protuct is .li~h~e,_d via valve 27. The moist drying air, loaded with solid matter, ~
the down-stream filter 1 via the crude gas line 3 . As a result of the c4ntin~10~1s rinsing of hoses 5, therc is assursncc of reliable . ---' b- ofthe sepsrated product, even with bigh te~ of moistures, so that even with irregul~rities in the o~, nlion of the dryer, high G~alii~ s~lfety of the filter prevail~.
U~ 0 ~ . V~ rA~ 1 ~lO~ UUU r~l i~n~nrr o~.~ v ~,v The ~lid matter which is diuharged with the rinsing flu~d csn be t~lln~h-ced inso the pn~cess with this m~hod To that end, tho sedimen~ion basin 14 is oo~
~a line 28 to ~..~eJor pwnp 28 wish the wet product u~ tor ~nain 25. The beneSt of this ~tep con~sts in that trea~,l.ent of discharge w~ter can be eliminated.
Claims
Claims 1) Surface Filter (1) with a housing (2), with a crude gas inlet (3), with Filter Elements (5, 16) located in housing (2) and with one or several nozzles (6) which are located on the crude gas side of the Filter Elements (5) and are connected with a rinsing fluid carrying line (7), characterized in that the nozzle or nozzles (6) are designed as binary nozzles, which are joined to the rinsing fluid line (7) and also to a pressurized gas line (9).
2) Filter according to Claim 1, characterized in that the filter elements (5, 16) are located in the upper region of housing (2) and that the nozzle (or nozzles) (6) are arranged below the filter elements (5, 16).
3) Filter (1) according to Claim 1 or 2, characterized in that one or several toward the filter elements (9,16) oriented nozzles (6) are arranged in the proximity of the crude gas inlet (3).
4) Filter (1) according to Claim 3, characterized in that a nozzle (6) is located in the crude gas line (3).
5) Filter (1) according to one of Claims 1 to 4, characterized in that the crude gas inlet (3) is arranged below the filter elements (5, 6).
6) Filter (1) according to one of Claims 1 to 5, characterized in that in filter housing (2) suspended filter hoses (5) are provided as filter elements.
7) Filter (1) according to one of Claims 1 to 5, characterized in that approximately horizontally arranged, from bottom to top traversed filter discs (16) are provided.
8) Filter (1) according to Claim 7, characterized in that on the pure gas side a nozzle (18) for rinsing fluid is located which serves for regeneration of the filter discs (16).
9) Filter (1) according to one of Claims 1 to 8, characterized in that a condenser (21) is arranged in the crude gas line (3).
10) Filter (1) according to one of Claims 1 to 9, characterized in that with adequately high tension supplied spray electrodes (22) are arranged in the filter housing (2) and that the filter elements (9, 16) are grounded.
11) Filter (1) according to one of Claims 1 to 10, characterized in that downstream of it there is arranged an installation (24 to 27) serving for drying of a pharmaceutical product or a food product, with a wet collector main (25) and that the sedimentation basin (14) communicates with the wet collector main (25) via a line (28) with a conveyor pump (29).
12) Filter (1) specifically according to one of the preceding Claims, with a housing (2), with a crude gas inlet (3), with a pure gas outlet (4), with filter elements (5, 16) located inside the housing (2), and with one or several nozzles (6), which are located on the crude gas side of the filter elements (5) and which are connected with a rinsing fluid carrying line (7), characterized in that the filter elements (5, 16) are located in the upper region of housing (2), and that the nozzle or nozzles (6) as well as the orifice of the crude gas supply line (3) are located below the filter elements (5, 16).
13) Process for operating a surface filter (1) with a housing (2), with a crude gas inlet (3), with a pure gas outlet (4), with filter elements (5, 16) located inside the housing (2) and with one or several nozzles (6), which are located on the crude gas side of filter elements (5) and which are connectedto a rinsing fluid carrying line (7), characterized that the nozzle (or nozzles) (6) produce a rinsing fluid mist with finely dispersed droplet spectrum and that the crude gases, prior to making contact with the crude gas side of the filter elements (5, 16) are being sprayed with said rinsing fluid mist.
14) Process according to Claim 13,characterized in that addition of the rinsing fluid mist takes place directly into the crude gas.
15) Process according to Claim 14, characterized in that the rinsing fluid mist is sprayed into the crude gas in such manner that the flow of the crude gas and the flow of the rinsing fluid are flowing in opposite directions. (revised page) (16) Process according to one of Claims 12 to 15, characterized in that the suspension consisting of rinsing fluid and separated particles is discharged from Filter (1) and passed into a sedimentation basin (14) and that the disassociating rinsing fluid is recycled.
17) Process according to one of Claims 13 to 16, characterized in that the filter elements are formed by filter hoses (5) suspended in housing (2) or by essentially horizontally arranged filter cartridges (16) and that the filter elements(5, 16) are traversed from bottom to top with to be purified gas and sprayed from below with rinsing fluid.
18) Process according to Claim 17, characterized in that the filter media of thefilter cartridges (16) are selected in such manner that they operate according to the principle of depth filtration.
19) Process according to one of Claims 13 to 18, characterized in that prior to entry into the filter housing heterogeneous condensation is caused with respect to moist crude gases.
20) Process according to one of Claims 13 to 19, characterized in that the sedimentation behavior is improved with the aid of a spray electrode, loaded with sufficiently high tension, which is located between the grounded filter elements (9, 16).
21) Process according to one of Claims 13 to 20, characterized in that rinsing fluids are employed which, in addition to the sedimentation of particle, also cause the separation of gaseous components. (revised page)
2) Filter according to Claim 1, characterized in that the filter elements (5, 16) are located in the upper region of housing (2) and that the nozzle (or nozzles) (6) are arranged below the filter elements (5, 16).
3) Filter (1) according to Claim 1 or 2, characterized in that one or several toward the filter elements (9,16) oriented nozzles (6) are arranged in the proximity of the crude gas inlet (3).
4) Filter (1) according to Claim 3, characterized in that a nozzle (6) is located in the crude gas line (3).
5) Filter (1) according to one of Claims 1 to 4, characterized in that the crude gas inlet (3) is arranged below the filter elements (5, 6).
6) Filter (1) according to one of Claims 1 to 5, characterized in that in filter housing (2) suspended filter hoses (5) are provided as filter elements.
7) Filter (1) according to one of Claims 1 to 5, characterized in that approximately horizontally arranged, from bottom to top traversed filter discs (16) are provided.
8) Filter (1) according to Claim 7, characterized in that on the pure gas side a nozzle (18) for rinsing fluid is located which serves for regeneration of the filter discs (16).
9) Filter (1) according to one of Claims 1 to 8, characterized in that a condenser (21) is arranged in the crude gas line (3).
10) Filter (1) according to one of Claims 1 to 9, characterized in that with adequately high tension supplied spray electrodes (22) are arranged in the filter housing (2) and that the filter elements (9, 16) are grounded.
11) Filter (1) according to one of Claims 1 to 10, characterized in that downstream of it there is arranged an installation (24 to 27) serving for drying of a pharmaceutical product or a food product, with a wet collector main (25) and that the sedimentation basin (14) communicates with the wet collector main (25) via a line (28) with a conveyor pump (29).
12) Filter (1) specifically according to one of the preceding Claims, with a housing (2), with a crude gas inlet (3), with a pure gas outlet (4), with filter elements (5, 16) located inside the housing (2), and with one or several nozzles (6), which are located on the crude gas side of the filter elements (5) and which are connected with a rinsing fluid carrying line (7), characterized in that the filter elements (5, 16) are located in the upper region of housing (2), and that the nozzle or nozzles (6) as well as the orifice of the crude gas supply line (3) are located below the filter elements (5, 16).
13) Process for operating a surface filter (1) with a housing (2), with a crude gas inlet (3), with a pure gas outlet (4), with filter elements (5, 16) located inside the housing (2) and with one or several nozzles (6), which are located on the crude gas side of filter elements (5) and which are connectedto a rinsing fluid carrying line (7), characterized that the nozzle (or nozzles) (6) produce a rinsing fluid mist with finely dispersed droplet spectrum and that the crude gases, prior to making contact with the crude gas side of the filter elements (5, 16) are being sprayed with said rinsing fluid mist.
14) Process according to Claim 13,characterized in that addition of the rinsing fluid mist takes place directly into the crude gas.
15) Process according to Claim 14, characterized in that the rinsing fluid mist is sprayed into the crude gas in such manner that the flow of the crude gas and the flow of the rinsing fluid are flowing in opposite directions. (revised page) (16) Process according to one of Claims 12 to 15, characterized in that the suspension consisting of rinsing fluid and separated particles is discharged from Filter (1) and passed into a sedimentation basin (14) and that the disassociating rinsing fluid is recycled.
17) Process according to one of Claims 13 to 16, characterized in that the filter elements are formed by filter hoses (5) suspended in housing (2) or by essentially horizontally arranged filter cartridges (16) and that the filter elements(5, 16) are traversed from bottom to top with to be purified gas and sprayed from below with rinsing fluid.
18) Process according to Claim 17, characterized in that the filter media of thefilter cartridges (16) are selected in such manner that they operate according to the principle of depth filtration.
19) Process according to one of Claims 13 to 18, characterized in that prior to entry into the filter housing heterogeneous condensation is caused with respect to moist crude gases.
20) Process according to one of Claims 13 to 19, characterized in that the sedimentation behavior is improved with the aid of a spray electrode, loaded with sufficiently high tension, which is located between the grounded filter elements (9, 16).
21) Process according to one of Claims 13 to 20, characterized in that rinsing fluids are employed which, in addition to the sedimentation of particle, also cause the separation of gaseous components. (revised page)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19542859A DE19542859A1 (en) | 1995-11-17 | 1995-11-17 | Surface filtration and filter |
| DE19542859.5 | 1995-11-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2237991A1 true CA2237991A1 (en) | 1997-05-29 |
Family
ID=7777697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002237991A Abandoned CA2237991A1 (en) | 1995-11-17 | 1996-11-13 | Surface filtration and surface filter |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0876190B1 (en) |
| AT (1) | ATE206631T1 (en) |
| AU (1) | AU7623196A (en) |
| CA (1) | CA2237991A1 (en) |
| DE (2) | DE19542859A1 (en) |
| WO (1) | WO1997018884A1 (en) |
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| DE102011107621B4 (en) | 2010-07-05 | 2022-11-03 | Uwe Athmann | Fine purification of product gases |
| DE102011122158B4 (en) | 2011-12-23 | 2019-10-24 | Uwe Athmann | Method and filter device for producing and purifying a product gas |
| DE202017104501U1 (en) * | 2017-07-28 | 2018-10-30 | Korsch Ag | Dust removal device for a tabletting machine |
| CN108579292B (en) * | 2018-04-27 | 2021-02-05 | 宁夏灵浩工贸有限公司 | Dust collector who uses during production and processing |
| DE102020115589A1 (en) | 2020-06-12 | 2021-12-16 | dezentec ingenieurgesellschaft mbH | Fine dust separation device for small combustion systems |
| EP3834910A1 (en) | 2019-12-12 | 2021-06-16 | dezentec ingenieurgesellschaft mbH | Fine dust separation device for small firing installations |
| CN111487094B (en) * | 2020-05-25 | 2023-05-02 | 中煤科工集团重庆研究院有限公司 | SO in the flue gas is discharged 3 Detection pretreatment system and use method thereof |
| DE102021002932A1 (en) | 2021-06-10 | 2022-12-15 | dezentec GmbH | Fine dust separation device for small furnaces |
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| US4323373A (en) * | 1981-03-23 | 1982-04-06 | Oxford Air Systems, Inc. | Apparatus and method for cleaning air |
| SE462615B (en) * | 1989-01-03 | 1990-07-30 | Flaekt Ab | FILTER FOR GAS CLEANING |
| US5217511A (en) * | 1992-01-24 | 1993-06-08 | The United States Of America As Represented By The Administrator Of The Environmental Protection Agency | Enhancement of electrostatic precipitation with electrostatically augmented fabric filtration |
| DE9304232U1 (en) * | 1993-03-22 | 1993-06-09 | Gutermuth Sen., Paul, 6456 Langenselbold, De | |
| JPH0857228A (en) * | 1994-08-15 | 1996-03-05 | Ishikawajima Harima Heavy Ind Co Ltd | Treatment apparatus for exhaust gas from melting furnace |
-
1995
- 1995-11-17 DE DE19542859A patent/DE19542859A1/en not_active Withdrawn
-
1996
- 1996-11-13 AU AU76231/96A patent/AU7623196A/en not_active Abandoned
- 1996-11-13 WO PCT/EP1996/004960 patent/WO1997018884A1/en active IP Right Grant
- 1996-11-13 AT AT96939019T patent/ATE206631T1/en not_active IP Right Cessation
- 1996-11-13 DE DE59607897T patent/DE59607897D1/en not_active Expired - Fee Related
- 1996-11-13 EP EP96939019A patent/EP0876190B1/en not_active Expired - Lifetime
- 1996-11-13 CA CA002237991A patent/CA2237991A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9643118B2 (en) | 2005-03-24 | 2017-05-09 | Durr Systems, Inc. | Device for removing wet paint overspray |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1997018884A1 (en) | 1997-05-29 |
| AU7623196A (en) | 1997-06-11 |
| EP0876190A1 (en) | 1998-11-11 |
| DE19542859A1 (en) | 1997-05-22 |
| ATE206631T1 (en) | 2001-10-15 |
| EP0876190B1 (en) | 2001-10-10 |
| DE59607897D1 (en) | 2001-11-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |