CA2001520A1 - Microwave pipe warmer - Google Patents
Microwave pipe warmerInfo
- Publication number
- CA2001520A1 CA2001520A1 CA002001520A CA2001520A CA2001520A1 CA 2001520 A1 CA2001520 A1 CA 2001520A1 CA 002001520 A CA002001520 A CA 002001520A CA 2001520 A CA2001520 A CA 2001520A CA 2001520 A1 CA2001520 A1 CA 2001520A1
- Authority
- CA
- Canada
- Prior art keywords
- pipe section
- fluid
- microwave energy
- pressure
- section
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/78—Arrangements for continuous movement of material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
- F16L53/30—Heating of pipes or pipe systems
- F16L53/34—Heating of pipes or pipe systems using electric, magnetic or electromagnetic fields, e.g. using induction, dielectric or microwave heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
- F24H1/101—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using electric energy supply
Abstract
ABSTRACT
A fluid pumping apparatus comprising a pipe section (1) to contain a viscous fluid to be pumped. The pipe section (1) includes a substantially transparent window (4) impermeable by the fluid, in use, allowing microwave energy from a source to be directed into the pipe section (1) to elevate the temperature of the fluid within the pipe section (1). The apparatus preferably includes a waveguide (5) inclined with respect to a longitudinal axis of the pipe section (1) to direct microwave energy through the window (4).
A fluid pumping apparatus comprising a pipe section (1) to contain a viscous fluid to be pumped. The pipe section (1) includes a substantially transparent window (4) impermeable by the fluid, in use, allowing microwave energy from a source to be directed into the pipe section (1) to elevate the temperature of the fluid within the pipe section (1). The apparatus preferably includes a waveguide (5) inclined with respect to a longitudinal axis of the pipe section (1) to direct microwave energy through the window (4).
Description
~ .
~u~b~Il-ventiQn ' ' ; ~:
The pr~ent ~nvention r~l~te~ to a flui~ pu~pin~
app~ratus which ut~llse~ m~ow~ve energy t~ ral~e the temperature o 1u~6 wlth~n a sectlon o~ plpe. `-~ e ~nvention hae been dev~lope~ pt~marily ~o ~ ;
acilltate the pump~ng o~ ~ B~OU~ 1uld~ ~n~ the pr~ce~slng o~ cllem~cAl rsact~nt~ 4nd will be d~s~bed here~nafter with reference to th0~e ~ppllcat~on~.
~owe~er, ~t will be ~ppreclated that the ~nventi~n i8 not limlted to these partlcul~r ields of use.
In the p~t, lt ha~ generally not boen fe~ble to pump m~ny high vi~co~ity fluid~, p~rticularly ov~r long di~tanre~ or whore the 1uid to be pumped i~ at a r~l~tively low te~per~turs.
nOw~ver~ the vi~osi~y of mo~t 1u~ds drops rap~dly 200152C~
.
with i-lcrea~e ~n temperatu~e qnd ~o by flrst heatin~ the flui~, it does beoome eas~ble to pump higher ~l~ao~i~y ma'ce~i~ls over long~r dlstancea ~ue to the ~e~ult~n~
reductlon in vi~c091ty.
Accord~g to pre~lously employed technigues~ ~
temperature r~se in A V~8COU~ 1uld has been achi~v~d by the application of heat to the outer qurace of B plpe carrylng the flui~ to be yumpe~. This he~t hes hitherto been applied either directly rom a canventlonal electric heater or alternat~vely by use of a heat~
water er steam jacket.
However,-~uch e~istinq techniques for war~lPg plpe~
are rel~t~Yely inefic~ent ~o the e~tent that it ~
nece~gary to heat the plpe be~ore the mat~rlal wlithln the pipe Can be heatQd. Tbl~ i~ particularly wasteul o energy in colder climat~ or ln applia~tlon~ ~here ~arger diameter or thicker pip~e ar~ u~ed.
Thl~ problem i~ e~acerbate~ i the material to be pumped i~ e poor thermal conductor, since energ~ lnput must 4e relatively high in order to achieve tb~
requisite temperature increa3e. Wor~e still, i the thermal energy ~ not tran~mitted uniformly thrau~h the material due to in~uicient or non-uni~orm therm~l condu~tion, the ~aterial can mo~e ~n a ~lug" d~wn the pip~ .
These proble~ ~anno~ alw~ be o~eraome by the ., application of additional heat because material~ havlng poor thermal con~ction characte~istic~ gi~e ~ise to .. .,,.. , ... _ . _ _ ............................... . i _ . . . " ', . ~ ' . ` ~ ~ ,.' suc~l steep temperature gradlent~ that the layer~-neare~t the pipe wall csn be b~rnt, vaporlsed or otherwi~n un~esira~ly ~ffected by excess~ve heat boore Ju~icient he~t has been transerred to the material ne~r thQ
cen~rn of the pi~e to ~chi~ve the de~ired reductlon ~n vl~co~ity.
Further~ore, if the materlal to be pump~ c~t~ln~
sol~g and li~ui~, or a ml~tu~e o liquid~ of v~yln~
boiling points, lt may not be feasible to heat th~
mat~ri~l to ~ temper~ture abovn the boll~ng po~nlt of the most volatlle component.
It 1~ an ob~ect of the present ~n~ntion tolpr~ide a fluid pumplng apparatu~ ~h~ch overcome~ o~
~ubstant~all~ ~meliorato~ one or more of the abovementioned dl~ ant~ges o ths pr~o~ art or ~
least to provide ~n~u~try with an ~ltern~tlve s~stem.
Ac~ordin~ly, in a flr~t ~spect, the ~n~nt~on con~l~t~ ln a 1uid pumping app~ratu~ comprl~ing o plpe sectlon to ~ontain ~ viscou~ flùid to be pumped ~hd including a ~ubstantlally ~icrowa~e tra~sp0rent w~n~ow lmperme~le by the flui~, 6ald window in u~e al~o~ng microw~ve energy from ~ ~ou~ce to be directed into ~al~
pipe ~ection ~o elevate the temper~ure of ~aid fluid wlthin said pipe ~ectlon.
Prefer~bly, th~ pipe ae¢tion co~pr~e~ an ~nn~r ~le~ve o~ 6ubsta~tiall~ microwave tran~par~nt materi~l, ~nd ~n ou~er c3sing having an openS ng the~e~.n ta dein~
3;
, .r ~ 't ,~
said microwave transparent win~o~.
The flpparatus preerably urther comprlaes o wa~Qguide lncl~ned with re~pect to a lonq~tu~ a~i~
~f tlle pipe s~ct~on to ~l~ect tha ~Crow~ve en~r~
through the w~n~w, The appnr~tu8 preerably ~1180 includea a ahp~e 1~nge ~ectlon conf lgured to perm~t proyagation of microwave energy when the f l~nge ~ec~ion contai~ the ~luid ~o be pumpe~ And t~ oub~tantially lmpede p~opagAt~on of mlcrowave energy beyond the 1angje ~ect~on when the ~l~nge ~ection ~B ~e~old of th~ flUld.
Accordlng to a ~econd aspeat, the ~nventio~
consists in a method o~ pump~ng ~ V~SCOU9 luia ~through a pipe ~ec~ion, comprl~lng the ~tep~ o~ tran~mi~t~ng micrewave energy ~nto the pipe ~ectlon thro~gh ~
micr~wnve ~ransparent wlndo~ im~ermeable to the fluid to elevate the tempsratu~e an~ thereby decre~se th~
vi~co~ity o the f lu-a, ~nd applying a different~l pre~6ur~ ~cro~# ~he pipe aect~on to Cauee the ~U~d to f low through the p~po ~ect~en.
Preerably, the m~cro~ave energy in direqt~d into the pipe ~ection At an acute angle wlth re~peat.to a longitudinal a~is of the pip8 ~ctl~n by ~e~n~ ~f a waveguide.
Preerably ~l~o, the metho~ Compri~e~ the ~u~th~r step o substantially lmpeding th~ p~opagation d mic~owave energy beyon~ ~he pip~ ~ec~l~n when the p~pe ~ection i5 empty by mean~ of a choke 1ange #ec~ion -` 200~S20 form~ng part of th~ pipe ne¢~ion ~n~ di~po~e~ ~t one en~
thereof.
In a p~e~erred ~orm o~ the in~entlon, the f~
wlt~lin the piye 6ect~on la ~alntaine~ ~t 4 pre~bre above atmosphcrlc pressur~.
Accordlng to a third ~ect, ~ha ln~nt~on ~n~i8t~
~n a method o proce~lng a ~lur~llty o~ chemlc~il reactentff, compri~ing the ~teps o pas~ing the rjeactant~
throuqh a p~pe ~ection, tr~n~mitting mlcrowave dn~r~y "
into the plpe ~ect~on through ~ microwave tran~arent window impermeable to the rea~t~nts, and appl~i~q dl~ferential pre~re across the pipe sect~on td ~au~e the reactants to 10w throu~h the pipe ~ection.
Preerably, the ~icrowave ener~y i~ direct~d lnto - -the pipe ~ec~ion at an Jcute angle with re~pectlto a l~ngitu~inal BSi~ o the plpe ~ection by moans df a ~vegui~.
Prefer~bly al~o, the method compri8e8 th8 ~urt,her ~tep of ~ubstantlally lmped~n~ the propagation a microw~ve energy bey~nd the p~pe ~ect~on when tHe pipe ~ectlon i~ empty by mean~ of a choke flange ~ec~ion forming part of ~he pipe ~ect~on an~ d~po~e~ ~ one en~
the~e~.
In ~ preerre~ ~orm o the in~entlon, tbe ~eact~nt~
within the plpe ~ection are m~intalne~ at a preB~ure above atmosphs~ pre~rs.
preferred el~odiment o the invention ~i~l now b~
~ Z001520 ' -desc~ibed, by ~ay 0~ example only, w~th r~fer~ncb to th~
accompanying arawlngs ln which:
Flgur~ 1 ~B a plan vi~ ~howlng part oE ~ ~
pu~p~ng apparatu~ ~ncorporating ~ microwave plpe¦warm~
in accordance wlth the pre~snt ~nvention;
Flgure 2 ~ ~ cro8s-~ectional ~ide elevatio¦n o tho mlcrowave pipe warmer depictod in figure 1 Figure 3 iB an end elevat~on o the microw~ve plpe warm~r ~epicted in flgute6 1 ~nd 2;
~ igure 4 i~ ~n enlarge~ ~ection~l ~et~l o~ ~rea A
dep~cted in igure 2.
P~L~ _ _ Reerring to the dra~ing~, there ls provld~d An apparatu~ ~or intro~cing micro~ave~ lnto a pip~
aarryln~ a vlscous flul~ to be pumped or a plur~llty ~f chemical r0~ctant~ to be processed. The appar~us comprises a main bo~ 1 ln the form o a plpe s~ction including 8paced apart end fla~ge ~eat~on~ ~ an~ 3, a microwave tran~perent window 4 and a waveguide g incli~ed ~t an ~cut~ ~ngle wlth respect to the ~ipe ~ection, The remote end 6 of the wavegul~e 5, te~m;n~te~ ln a lange 7 ada~ted to be connscte~ to a cvnventional m~crowave generating source (not ~Jo~n) to d~rect micro~ave en~rgy from the ~our~e, thr~ug~ the wlndow 4 and into the p~pe 8ec~ion to elev~te t~e temperature o the flUld ~lthin the pipe, an~ ~ereby lo~e~ ~t~ vlsco~ity to enable ~t t~ be pumpe~ ~re ef f iciently.
!
~J~
~ he flange ~ections 2 ~nd 3 en~ble ~hn appal~tus to be incorporated into ~ conrentlon~ ng ~y~te~ tnot ~hown).
It may be observed ~om f ig~re 2 t~l~t the n ~in bo~
1 of the apparat~s, whlch i~ pr~ferRbly fabrlc~t o~ ~rom non-maqnètic electrically conductive materlal 8~ ch as ~tainles~ steel, lncorporat~ ~n inner ~lee~e ~!o ~uhotant~ally mlcrowAve tr~n~p~rent, mlcrowave l¦n~rt m~teria~ such ~B polytetrafluoroethene sold und~r the tra~e n~me TEFLON, wh~ch serve~ a tr~ple ~nctl~n.
Firotly, the ~leeve i~ ~imen~loned ~o thst ¦the internal wall of the m~in body 1 a~ pre~entea td ~he vi~cou8 materlal flowing through the pipe 1~ ~mo oth ~nd continuous, and not o a ~tepped conf~guratian d ue to the mA~ n bod~ 1 o~ the app~atus being o ~ larg e~
d~a~ete~ than the inn~r di~m~ter o~ the en~ ~lan 9~
oectlon~ 2 an~ 3. 6econdl~, the oleeve muot noq ~nh~b~t ~:
the p~ ge o m~crow~ves rom the w~veguiae 5 ~nto the m~in bo~y 1 Bo the 81eeve act~ ~o ~ window thro~gh Wh~Ch microwave rad~at~on ~y p~os. Thlrdly, the sle~ve mu~t be impermeable to prevent the eg~eB~ of ~lU~d f~ ~
re~ion 9 into the w~veguide and microwave qenerE t~ng area.
Th~ main body 1 together w~th 1~nge ~eCt~jn~ 2 An~
3 are propertloned ~nd dlmens~ened guCh that th~
mlcrowave~ are eu~t~nti~lly uniformly ~b~orbedli~t~ the ~luid p~ing through the ~pp~tu~. The par~m~er~
wl~ich will detormine tho ~ImenulDn~ ~E the mDln bDdy ~n~
-7- .
20015~0 flange ormat~ons are the ~eci1cation o~ the mldra~a~e source it~el (whlch will noce~3srlly be in ecco~nce wlth on~ of the ISM b~n~s ~5thin the nlectrom~gn~ia ~pectrum), the dlelectrlc con~t~nt or rel~tive p~rmittivity of the Vl8cOUJ 1uid belng pum~e~ t, h~ou~h the apparatu~, and the dlelectri~ con~tant of thl ~ slee~
8 and the outer ca~ing. In thl~ embo~lment, thel intern~l ~lameter ~n~ length of flanges 2 ~nd 3 Lte rela~ed to the w~vel~ngth of the ml~rowavo radl Bti~n ~uch thnt the~e flange format~ons act as chok~ ln order to lmpede th~ propagatlon of m~arowave~ pa~t the¦1ange~
~nd ln~o the a3sociated p~ping (not ~ho~n) of th,~ t~m when the plpe sect~on ls empty of flul~. !
The ~lAnges n~e~ not ne~e~arily be o ~iml l~r cro~ ct~on to the p~lng utll~sed ln the plan t. For e~ampl~, ~f the dlameter o the 1~ngo~ cons i~erably Ie~ than that o~ the p~ping used ~n the plant t h~n manlfold~ng coul~ be utlll~ed s~ch that a number ~ pip~
warmer~ m~y be placed ln parallel cone19ur~tlon.
Nat only must the diam~ter a the main bod~ ~ an~ ~
flan~e ~ection~ 2 an~ 3 be ohos~n ~uch ~hat mic O~VR~
may adeq~tely propagato in the ma~n body an~ w rm the viscou~ mate~al but the dim~n~lon~ o the en~ f l~n~e are pr~f~rably ~uch that m~crowa~o~ w~ll not pr~gate outsidQ the nppar~tu~ in the ab~ence of mator~a~ to be pumped. Thi~ i8 po~slble due t~ th~ act that tih~
dielectric constant of ~i~ 18 consider~blr di~rent ~o th~t of most ma~eri~l~ whlch ~o l~kely to be p~bed .' i.
-8~
~001520 through the apparatus an~ con~equently the flang~a and a~ociated jolninq plpes may be t~ned 80 a~ to c~ake the pa~sage o miorow~ve8 and en~ure that they ~ro attenuated to an acceptabl~ lo~el before leavlng~he ~s~em if t~e plpe 1~ empty. Thl~ la lmportant ~ ~rd~r to prevent the piping of the plant actlng a8 a ~e9uide ne~work p~rmltting mlcrowave~ to ~a~ down empty~ e~
and lnto are~ where they could pr0~nt ~lgnl~lc ~nt d~ngers. ~ :
In tho p~6t, seallng of liners ha~ b~Qn ~ p r~bl~m ~n con~truction o~ sy~tems h~vlng multlple pi~e s~ction~ :
joined in line. ~TF~ (polytetra1uoroethene) B0 1~ unde~
the tra~e name TEF~ON i~ a good micro~ave tlAnsp ~ent materiAl, However, it i~ ~ub~ect to cxeey o~e~ l~ng time pcrlod~, part~cularly ~hen expo~ed ~o hi~h tsmperatures ~nd thls make~ it ~f~lcult to main ~ln a good ~eal in a long multl-~ection pipe. To o~er ~me th~ ~lficulty, a ceramic tube may be use~ to ~ r~vld~ a dlmensionally ~table, non-compressible struatura 1 suppor~ or a microwave tX~nsparent tef lon llner w~ereby ~ good seal can b~ malnta~nea ln a mul~ ipl~
6ect~vn pip~ng network.
It w~ll be noted from flgure 4 that flange 3'i~
de~gned ~o be connected to opposing flang~ 10 ~ n ~he main body 1 ~f the ~pparAtu~. The flange ~ al~
include~ a ~tep 11 w~ereby the ~ntersngagement ~ e~wee~
flan~e 3 ~nd flange 10 re~lt6 in comp~e~8ion of the te10n ~ vc ~ tl~ereby effecting a good ~nt-r ~ fluid _g_ . ~ , rr~ ~ ;
~ ?~'^1 ` -- 2001S20 ~eal at the interfDce 12 between flange 3 ~nd al ~v~ 8.
In many pumping ~n~ proce~8ing Appllcat10n~ it 1 de~irable ~o malntain the pre~ura and/or temper Itur~
within the pi~e sect~on at above ~mbi~nt con~ltibn~.
Thl~ m~y be ~chleved by a ~ump 8Uch as ~ p~ri~taL~1c pump nt one or both end~ of the apparatu~. ¦
~l~ernatively, tlle posltiv~ ~re~ure hea~ from a¦flui~
re~ervoir or ~mply the b~ckpre~aure ~rom the ~y~t~m or a pres~ure corltro1 valve can he used. ' ..
Uy the application o mlcrowave ene~gy ~1~ ilc~ly to the f1ul~ material to bo p~mp~a, unlform h~tin ¦~e~ult~
and ~lugglng or overheat~n~ o~ the ~ur~ce l~e 18 adjacent the plpe i~ eef~ctively avoided. 8inc ~h~ :
pipe itsol i~ not heated e~cept by thermal con u~tlon rom the mate~lal, si~nific~nt energy ~an be aa ea.
It should be noted that the ~sl~ o thè ~a e~u~e orms an acute angle w~ th rè~peat to the asi~ o the pipe ~uch that a ~lo~ly lncreA~in~ ~mount ~ th ~lu~
i~ presented to the m~crowave wave-fron~ ~ lt r~velB
along thc wavegulde. In th~ way, the w~e-fro t o th~
microwave ra~tlon see~ a gra~ual change ln im ed~nce a ~t travel~ tow~rd8, and i~ ab~orbe~ by the ~ bBtance to be heated. Th~ conf~gurat~on avoid8 an ~br pt ch~nge in Impedanco wh1ch would cau~e unde~irab e rePloction~ back along the w~veguide to the m~ o~ave sourc~.
Conv~nti~nal ~tuned-T-~ection~ n are oten ~bd ~o achieve good coupling by impadance m~tchlnq. H w~ver, -10~
- Z001520 ~ _.:
such tuning l~ h~ghly depen~nt upon the m~teti~ 1 to be heated ~nd a particular tuned wa~eguide-T-~unct~ ~n 1 ther~Eore limitea to a relatively ~m~ll sele~tlo~
~ub~ances having a narrow ranq0 o d~el(actr1c constants. The inclined confiquration of th~ ~av ~ul~e of the pre8ent lnventlon al80 permit~ the ~a~u ~e to function relatfvely ~ndependently o~ the dieleot la constant of tl)e ~ateriBl to be heated ~nd ~o In he apparatus deqcribed, mini~al tunlng 18 nece~ry in~
m~terisls havinq ~ f~r yroat~ r~nge o ~ielectr constant~ may be convenl~ntly use~ wltho~t mo~lf ~tion~
to the ~y8tem.
A~cording to 8 furt~ler a~pect of the lnvent ~n, there i8 pro~ided ~ msthod of proce861ng a plurB lt~ of chem~cal reaatant~ ~n th~ ~pp~ratu~ ~e8crl~ed. r~i~
f~rm ~ the lnvention i8 p~rtlcul~ly 8uit~ble f ~ :
~rocesslng llquids or multl-pha8e Bolid/liqul~ n ~t~res wllere it i8 desired to rai~e the ternperature ~nd ~or pres~ure of the materl~l~ to be proce~sed.
In part~cular, many chemical reactlons ahd¦
processes can be initiated, sustained or otherwi¦~
controlled by tho appl~e~tion of m~cro~ve eners Iy to the reactants to be proc~e~. Thu~, lt will be apE r~cl~te~
th~t in ~uc~l appllcat~ons, the present ln~,rentlor provides a ~ae env~ronment whereln pressure, temperatur~ ~nd mlcrowav~ energ~ levul~ c~n be !
accurately ~ntr~lle~ to produce the de~ed rea c~lon rate~ and con~;tlons in either a contlnuou~ o~ ~ ~tch _ I
A .. .~ .. Z
proce~s. It w111 a1so ~e ~p~rent t~l~t teac~ont~ ~ m~y be introduced ~t ~lfferent ~oints along the ~i~e 8e~ ~ion.
~ y malntaining tho r~actant~ ~t a pre~u~e ~ ~ove atmosphere~c prei~ure, hlgher temper~ture~ c~n bl 7 reac~led in the pipe gectlon wlthout v~pori~at~on ~f the more volatile component~ An~ the ~on~quentisl tl lqr~l inef~ciencle~, This posltive pre~sure can ~ ~ ~4ievea by designing the ~ystem to ensuro th~t a po~itlv~
baCkpre~BUre i8 m~int~ined. Alt~rn~tively, ~lul~ I p~mp~
~uch as per~t~ltlc pumpn pl~ced ~t one or both I ~ of ~he app~r~tus, or a positive pressure h~sd from I ~ 1ui~
re~ervo~r c~n be u~ed.
It will also be app~rent th0t the pr~sent i ~ention w111 also have ~pplicakion in hy~rometnlurgic~l processe~, and other pr~ce~ where it i~ nece8 ~r or desirable to raise the temper~tu~e o m~terial~ o be proce~ed or pumped.
~ lthough the i~vent~on hns been de~crlbe~ w: l~h refarence to spe~ific e~m~les, lt will be ~p~eo ~ate~
by tho~e ~killed in the 0r~ that the ln~ention m; l~ be embod~ed in many other fo~m~.
'r~ lr , , t ~ "x~
~u~b~Il-ventiQn ' ' ; ~:
The pr~ent ~nvention r~l~te~ to a flui~ pu~pin~
app~ratus which ut~llse~ m~ow~ve energy t~ ral~e the temperature o 1u~6 wlth~n a sectlon o~ plpe. `-~ e ~nvention hae been dev~lope~ pt~marily ~o ~ ;
acilltate the pump~ng o~ ~ B~OU~ 1uld~ ~n~ the pr~ce~slng o~ cllem~cAl rsact~nt~ 4nd will be d~s~bed here~nafter with reference to th0~e ~ppllcat~on~.
~owe~er, ~t will be ~ppreclated that the ~nventi~n i8 not limlted to these partlcul~r ields of use.
In the p~t, lt ha~ generally not boen fe~ble to pump m~ny high vi~co~ity fluid~, p~rticularly ov~r long di~tanre~ or whore the 1uid to be pumped i~ at a r~l~tively low te~per~turs.
nOw~ver~ the vi~osi~y of mo~t 1u~ds drops rap~dly 200152C~
.
with i-lcrea~e ~n temperatu~e qnd ~o by flrst heatin~ the flui~, it does beoome eas~ble to pump higher ~l~ao~i~y ma'ce~i~ls over long~r dlstancea ~ue to the ~e~ult~n~
reductlon in vi~c091ty.
Accord~g to pre~lously employed technigues~ ~
temperature r~se in A V~8COU~ 1uld has been achi~v~d by the application of heat to the outer qurace of B plpe carrylng the flui~ to be yumpe~. This he~t hes hitherto been applied either directly rom a canventlonal electric heater or alternat~vely by use of a heat~
water er steam jacket.
However,-~uch e~istinq techniques for war~lPg plpe~
are rel~t~Yely inefic~ent ~o the e~tent that it ~
nece~gary to heat the plpe be~ore the mat~rlal wlithln the pipe Can be heatQd. Tbl~ i~ particularly wasteul o energy in colder climat~ or ln applia~tlon~ ~here ~arger diameter or thicker pip~e ar~ u~ed.
Thl~ problem i~ e~acerbate~ i the material to be pumped i~ e poor thermal conductor, since energ~ lnput must 4e relatively high in order to achieve tb~
requisite temperature increa3e. Wor~e still, i the thermal energy ~ not tran~mitted uniformly thrau~h the material due to in~uicient or non-uni~orm therm~l condu~tion, the ~aterial can mo~e ~n a ~lug" d~wn the pip~ .
These proble~ ~anno~ alw~ be o~eraome by the ., application of additional heat because material~ havlng poor thermal con~ction characte~istic~ gi~e ~ise to .. .,,.. , ... _ . _ _ ............................... . i _ . . . " ', . ~ ' . ` ~ ~ ,.' suc~l steep temperature gradlent~ that the layer~-neare~t the pipe wall csn be b~rnt, vaporlsed or otherwi~n un~esira~ly ~ffected by excess~ve heat boore Ju~icient he~t has been transerred to the material ne~r thQ
cen~rn of the pi~e to ~chi~ve the de~ired reductlon ~n vl~co~ity.
Further~ore, if the materlal to be pump~ c~t~ln~
sol~g and li~ui~, or a ml~tu~e o liquid~ of v~yln~
boiling points, lt may not be feasible to heat th~
mat~ri~l to ~ temper~ture abovn the boll~ng po~nlt of the most volatlle component.
It 1~ an ob~ect of the present ~n~ntion tolpr~ide a fluid pumplng apparatu~ ~h~ch overcome~ o~
~ubstant~all~ ~meliorato~ one or more of the abovementioned dl~ ant~ges o ths pr~o~ art or ~
least to provide ~n~u~try with an ~ltern~tlve s~stem.
Ac~ordin~ly, in a flr~t ~spect, the ~n~nt~on con~l~t~ ln a 1uid pumping app~ratu~ comprl~ing o plpe sectlon to ~ontain ~ viscou~ flùid to be pumped ~hd including a ~ubstantlally ~icrowa~e tra~sp0rent w~n~ow lmperme~le by the flui~, 6ald window in u~e al~o~ng microw~ve energy from ~ ~ou~ce to be directed into ~al~
pipe ~ection ~o elevate the temper~ure of ~aid fluid wlthin said pipe ~ectlon.
Prefer~bly, th~ pipe ae¢tion co~pr~e~ an ~nn~r ~le~ve o~ 6ubsta~tiall~ microwave tran~par~nt materi~l, ~nd ~n ou~er c3sing having an openS ng the~e~.n ta dein~
3;
, .r ~ 't ,~
said microwave transparent win~o~.
The flpparatus preerably urther comprlaes o wa~Qguide lncl~ned with re~pect to a lonq~tu~ a~i~
~f tlle pipe s~ct~on to ~l~ect tha ~Crow~ve en~r~
through the w~n~w, The appnr~tu8 preerably ~1180 includea a ahp~e 1~nge ~ectlon conf lgured to perm~t proyagation of microwave energy when the f l~nge ~ec~ion contai~ the ~luid ~o be pumpe~ And t~ oub~tantially lmpede p~opagAt~on of mlcrowave energy beyond the 1angje ~ect~on when the ~l~nge ~ection ~B ~e~old of th~ flUld.
Accordlng to a ~econd aspeat, the ~nventio~
consists in a method o~ pump~ng ~ V~SCOU9 luia ~through a pipe ~ec~ion, comprl~lng the ~tep~ o~ tran~mi~t~ng micrewave energy ~nto the pipe ~ectlon thro~gh ~
micr~wnve ~ransparent wlndo~ im~ermeable to the fluid to elevate the tempsratu~e an~ thereby decre~se th~
vi~co~ity o the f lu-a, ~nd applying a different~l pre~6ur~ ~cro~# ~he pipe aect~on to Cauee the ~U~d to f low through the p~po ~ect~en.
Preerably, the m~cro~ave energy in direqt~d into the pipe ~ection At an acute angle wlth re~peat.to a longitudinal a~is of the pip8 ~ctl~n by ~e~n~ ~f a waveguide.
Preerably ~l~o, the metho~ Compri~e~ the ~u~th~r step o substantially lmpeding th~ p~opagation d mic~owave energy beyon~ ~he pip~ ~ec~l~n when the p~pe ~ection i5 empty by mean~ of a choke 1ange #ec~ion -` 200~S20 form~ng part of th~ pipe ne¢~ion ~n~ di~po~e~ ~t one en~
thereof.
In a p~e~erred ~orm o~ the in~entlon, the f~
wlt~lin the piye 6ect~on la ~alntaine~ ~t 4 pre~bre above atmosphcrlc pressur~.
Accordlng to a third ~ect, ~ha ln~nt~on ~n~i8t~
~n a method o proce~lng a ~lur~llty o~ chemlc~il reactentff, compri~ing the ~teps o pas~ing the rjeactant~
throuqh a p~pe ~ection, tr~n~mitting mlcrowave dn~r~y "
into the plpe ~ect~on through ~ microwave tran~arent window impermeable to the rea~t~nts, and appl~i~q dl~ferential pre~re across the pipe sect~on td ~au~e the reactants to 10w throu~h the pipe ~ection.
Preerably, the ~icrowave ener~y i~ direct~d lnto - -the pipe ~ec~ion at an Jcute angle with re~pectlto a l~ngitu~inal BSi~ o the plpe ~ection by moans df a ~vegui~.
Prefer~bly al~o, the method compri8e8 th8 ~urt,her ~tep of ~ubstantlally lmped~n~ the propagation a microw~ve energy bey~nd the p~pe ~ect~on when tHe pipe ~ectlon i~ empty by mean~ of a choke flange ~ec~ion forming part of ~he pipe ~ect~on an~ d~po~e~ ~ one en~
the~e~.
In ~ preerre~ ~orm o the in~entlon, tbe ~eact~nt~
within the plpe ~ection are m~intalne~ at a preB~ure above atmosphs~ pre~rs.
preferred el~odiment o the invention ~i~l now b~
~ Z001520 ' -desc~ibed, by ~ay 0~ example only, w~th r~fer~ncb to th~
accompanying arawlngs ln which:
Flgur~ 1 ~B a plan vi~ ~howlng part oE ~ ~
pu~p~ng apparatu~ ~ncorporating ~ microwave plpe¦warm~
in accordance wlth the pre~snt ~nvention;
Flgure 2 ~ ~ cro8s-~ectional ~ide elevatio¦n o tho mlcrowave pipe warmer depictod in figure 1 Figure 3 iB an end elevat~on o the microw~ve plpe warm~r ~epicted in flgute6 1 ~nd 2;
~ igure 4 i~ ~n enlarge~ ~ection~l ~et~l o~ ~rea A
dep~cted in igure 2.
P~L~ _ _ Reerring to the dra~ing~, there ls provld~d An apparatu~ ~or intro~cing micro~ave~ lnto a pip~
aarryln~ a vlscous flul~ to be pumped or a plur~llty ~f chemical r0~ctant~ to be processed. The appar~us comprises a main bo~ 1 ln the form o a plpe s~ction including 8paced apart end fla~ge ~eat~on~ ~ an~ 3, a microwave tran~perent window 4 and a waveguide g incli~ed ~t an ~cut~ ~ngle wlth respect to the ~ipe ~ection, The remote end 6 of the wavegul~e 5, te~m;n~te~ ln a lange 7 ada~ted to be connscte~ to a cvnventional m~crowave generating source (not ~Jo~n) to d~rect micro~ave en~rgy from the ~our~e, thr~ug~ the wlndow 4 and into the p~pe 8ec~ion to elev~te t~e temperature o the flUld ~lthin the pipe, an~ ~ereby lo~e~ ~t~ vlsco~ity to enable ~t t~ be pumpe~ ~re ef f iciently.
!
~J~
~ he flange ~ections 2 ~nd 3 en~ble ~hn appal~tus to be incorporated into ~ conrentlon~ ng ~y~te~ tnot ~hown).
It may be observed ~om f ig~re 2 t~l~t the n ~in bo~
1 of the apparat~s, whlch i~ pr~ferRbly fabrlc~t o~ ~rom non-maqnètic electrically conductive materlal 8~ ch as ~tainles~ steel, lncorporat~ ~n inner ~lee~e ~!o ~uhotant~ally mlcrowAve tr~n~p~rent, mlcrowave l¦n~rt m~teria~ such ~B polytetrafluoroethene sold und~r the tra~e n~me TEFLON, wh~ch serve~ a tr~ple ~nctl~n.
Firotly, the ~leeve i~ ~imen~loned ~o thst ¦the internal wall of the m~in body 1 a~ pre~entea td ~he vi~cou8 materlal flowing through the pipe 1~ ~mo oth ~nd continuous, and not o a ~tepped conf~guratian d ue to the mA~ n bod~ 1 o~ the app~atus being o ~ larg e~
d~a~ete~ than the inn~r di~m~ter o~ the en~ ~lan 9~
oectlon~ 2 an~ 3. 6econdl~, the oleeve muot noq ~nh~b~t ~:
the p~ ge o m~crow~ves rom the w~veguiae 5 ~nto the m~in bo~y 1 Bo the 81eeve act~ ~o ~ window thro~gh Wh~Ch microwave rad~at~on ~y p~os. Thlrdly, the sle~ve mu~t be impermeable to prevent the eg~eB~ of ~lU~d f~ ~
re~ion 9 into the w~veguide and microwave qenerE t~ng area.
Th~ main body 1 together w~th 1~nge ~eCt~jn~ 2 An~
3 are propertloned ~nd dlmens~ened guCh that th~
mlcrowave~ are eu~t~nti~lly uniformly ~b~orbedli~t~ the ~luid p~ing through the ~pp~tu~. The par~m~er~
wl~ich will detormine tho ~ImenulDn~ ~E the mDln bDdy ~n~
-7- .
20015~0 flange ormat~ons are the ~eci1cation o~ the mldra~a~e source it~el (whlch will noce~3srlly be in ecco~nce wlth on~ of the ISM b~n~s ~5thin the nlectrom~gn~ia ~pectrum), the dlelectrlc con~t~nt or rel~tive p~rmittivity of the Vl8cOUJ 1uid belng pum~e~ t, h~ou~h the apparatu~, and the dlelectri~ con~tant of thl ~ slee~
8 and the outer ca~ing. In thl~ embo~lment, thel intern~l ~lameter ~n~ length of flanges 2 ~nd 3 Lte rela~ed to the w~vel~ngth of the ml~rowavo radl Bti~n ~uch thnt the~e flange format~ons act as chok~ ln order to lmpede th~ propagatlon of m~arowave~ pa~t the¦1ange~
~nd ln~o the a3sociated p~ping (not ~ho~n) of th,~ t~m when the plpe sect~on ls empty of flul~. !
The ~lAnges n~e~ not ne~e~arily be o ~iml l~r cro~ ct~on to the p~lng utll~sed ln the plan t. For e~ampl~, ~f the dlameter o the 1~ngo~ cons i~erably Ie~ than that o~ the p~ping used ~n the plant t h~n manlfold~ng coul~ be utlll~ed s~ch that a number ~ pip~
warmer~ m~y be placed ln parallel cone19ur~tlon.
Nat only must the diam~ter a the main bod~ ~ an~ ~
flan~e ~ection~ 2 an~ 3 be ohos~n ~uch ~hat mic O~VR~
may adeq~tely propagato in the ma~n body an~ w rm the viscou~ mate~al but the dim~n~lon~ o the en~ f l~n~e are pr~f~rably ~uch that m~crowa~o~ w~ll not pr~gate outsidQ the nppar~tu~ in the ab~ence of mator~a~ to be pumped. Thi~ i8 po~slble due t~ th~ act that tih~
dielectric constant of ~i~ 18 consider~blr di~rent ~o th~t of most ma~eri~l~ whlch ~o l~kely to be p~bed .' i.
-8~
~001520 through the apparatus an~ con~equently the flang~a and a~ociated jolninq plpes may be t~ned 80 a~ to c~ake the pa~sage o miorow~ve8 and en~ure that they ~ro attenuated to an acceptabl~ lo~el before leavlng~he ~s~em if t~e plpe 1~ empty. Thl~ la lmportant ~ ~rd~r to prevent the piping of the plant actlng a8 a ~e9uide ne~work p~rmltting mlcrowave~ to ~a~ down empty~ e~
and lnto are~ where they could pr0~nt ~lgnl~lc ~nt d~ngers. ~ :
In tho p~6t, seallng of liners ha~ b~Qn ~ p r~bl~m ~n con~truction o~ sy~tems h~vlng multlple pi~e s~ction~ :
joined in line. ~TF~ (polytetra1uoroethene) B0 1~ unde~
the tra~e name TEF~ON i~ a good micro~ave tlAnsp ~ent materiAl, However, it i~ ~ub~ect to cxeey o~e~ l~ng time pcrlod~, part~cularly ~hen expo~ed ~o hi~h tsmperatures ~nd thls make~ it ~f~lcult to main ~ln a good ~eal in a long multl-~ection pipe. To o~er ~me th~ ~lficulty, a ceramic tube may be use~ to ~ r~vld~ a dlmensionally ~table, non-compressible struatura 1 suppor~ or a microwave tX~nsparent tef lon llner w~ereby ~ good seal can b~ malnta~nea ln a mul~ ipl~
6ect~vn pip~ng network.
It w~ll be noted from flgure 4 that flange 3'i~
de~gned ~o be connected to opposing flang~ 10 ~ n ~he main body 1 ~f the ~pparAtu~. The flange ~ al~
include~ a ~tep 11 w~ereby the ~ntersngagement ~ e~wee~
flan~e 3 ~nd flange 10 re~lt6 in comp~e~8ion of the te10n ~ vc ~ tl~ereby effecting a good ~nt-r ~ fluid _g_ . ~ , rr~ ~ ;
~ ?~'^1 ` -- 2001S20 ~eal at the interfDce 12 between flange 3 ~nd al ~v~ 8.
In many pumping ~n~ proce~8ing Appllcat10n~ it 1 de~irable ~o malntain the pre~ura and/or temper Itur~
within the pi~e sect~on at above ~mbi~nt con~ltibn~.
Thl~ m~y be ~chleved by a ~ump 8Uch as ~ p~ri~taL~1c pump nt one or both end~ of the apparatu~. ¦
~l~ernatively, tlle posltiv~ ~re~ure hea~ from a¦flui~
re~ervoir or ~mply the b~ckpre~aure ~rom the ~y~t~m or a pres~ure corltro1 valve can he used. ' ..
Uy the application o mlcrowave ene~gy ~1~ ilc~ly to the f1ul~ material to bo p~mp~a, unlform h~tin ¦~e~ult~
and ~lugglng or overheat~n~ o~ the ~ur~ce l~e 18 adjacent the plpe i~ eef~ctively avoided. 8inc ~h~ :
pipe itsol i~ not heated e~cept by thermal con u~tlon rom the mate~lal, si~nific~nt energy ~an be aa ea.
It should be noted that the ~sl~ o thè ~a e~u~e orms an acute angle w~ th rè~peat to the asi~ o the pipe ~uch that a ~lo~ly lncreA~in~ ~mount ~ th ~lu~
i~ presented to the m~crowave wave-fron~ ~ lt r~velB
along thc wavegulde. In th~ way, the w~e-fro t o th~
microwave ra~tlon see~ a gra~ual change ln im ed~nce a ~t travel~ tow~rd8, and i~ ab~orbe~ by the ~ bBtance to be heated. Th~ conf~gurat~on avoid8 an ~br pt ch~nge in Impedanco wh1ch would cau~e unde~irab e rePloction~ back along the w~veguide to the m~ o~ave sourc~.
Conv~nti~nal ~tuned-T-~ection~ n are oten ~bd ~o achieve good coupling by impadance m~tchlnq. H w~ver, -10~
- Z001520 ~ _.:
such tuning l~ h~ghly depen~nt upon the m~teti~ 1 to be heated ~nd a particular tuned wa~eguide-T-~unct~ ~n 1 ther~Eore limitea to a relatively ~m~ll sele~tlo~
~ub~ances having a narrow ranq0 o d~el(actr1c constants. The inclined confiquration of th~ ~av ~ul~e of the pre8ent lnventlon al80 permit~ the ~a~u ~e to function relatfvely ~ndependently o~ the dieleot la constant of tl)e ~ateriBl to be heated ~nd ~o In he apparatus deqcribed, mini~al tunlng 18 nece~ry in~
m~terisls havinq ~ f~r yroat~ r~nge o ~ielectr constant~ may be convenl~ntly use~ wltho~t mo~lf ~tion~
to the ~y8tem.
A~cording to 8 furt~ler a~pect of the lnvent ~n, there i8 pro~ided ~ msthod of proce861ng a plurB lt~ of chem~cal reaatant~ ~n th~ ~pp~ratu~ ~e8crl~ed. r~i~
f~rm ~ the lnvention i8 p~rtlcul~ly 8uit~ble f ~ :
~rocesslng llquids or multl-pha8e Bolid/liqul~ n ~t~res wllere it i8 desired to rai~e the ternperature ~nd ~or pres~ure of the materl~l~ to be proce~sed.
In part~cular, many chemical reactlons ahd¦
processes can be initiated, sustained or otherwi¦~
controlled by tho appl~e~tion of m~cro~ve eners Iy to the reactants to be proc~e~. Thu~, lt will be apE r~cl~te~
th~t in ~uc~l appllcat~ons, the present ln~,rentlor provides a ~ae env~ronment whereln pressure, temperatur~ ~nd mlcrowav~ energ~ levul~ c~n be !
accurately ~ntr~lle~ to produce the de~ed rea c~lon rate~ and con~;tlons in either a contlnuou~ o~ ~ ~tch _ I
A .. .~ .. Z
proce~s. It w111 a1so ~e ~p~rent t~l~t teac~ont~ ~ m~y be introduced ~t ~lfferent ~oints along the ~i~e 8e~ ~ion.
~ y malntaining tho r~actant~ ~t a pre~u~e ~ ~ove atmosphere~c prei~ure, hlgher temper~ture~ c~n bl 7 reac~led in the pipe gectlon wlthout v~pori~at~on ~f the more volatile component~ An~ the ~on~quentisl tl lqr~l inef~ciencle~, This posltive pre~sure can ~ ~ ~4ievea by designing the ~ystem to ensuro th~t a po~itlv~
baCkpre~BUre i8 m~int~ined. Alt~rn~tively, ~lul~ I p~mp~
~uch as per~t~ltlc pumpn pl~ced ~t one or both I ~ of ~he app~r~tus, or a positive pressure h~sd from I ~ 1ui~
re~ervo~r c~n be u~ed.
It will also be app~rent th0t the pr~sent i ~ention w111 also have ~pplicakion in hy~rometnlurgic~l processe~, and other pr~ce~ where it i~ nece8 ~r or desirable to raise the temper~tu~e o m~terial~ o be proce~ed or pumped.
~ lthough the i~vent~on hns been de~crlbe~ w: l~h refarence to spe~ific e~m~les, lt will be ~p~eo ~ate~
by tho~e ~killed in the 0r~ that the ln~ention m; l~ be embod~ed in many other fo~m~.
'r~ lr , , t ~ "x~
Claims (22)
1. A fluid pumping apparatus comprising a pipe section to contain a viscous fluid to be pumped and including a substantially microwave transparent window impermeable by the fluid, said window in use allowing microwave energy from a source to be directed into said pipe section to elevate the temperature of said fluid within said pipe section.
2. An apparatus according to claim 1 wherein said pipe section comprises an inner sleeve of substantially microwave transparent material, and an outer casing having an opening therein to define said microwave transparent window.
3. An apparatus according to claim 1 or 2 further comprising a waveguide inclined with respect to a longitudinal axis of said pipe section to direct said microwave energy through said window.
4. An apparatus according to claim 2 wherein said inner sleeve is composed of polytetrafluoroethene (PTFE).
5. An apparatus according to claim 2 wherein said inner sleeve is composed of a ceramic material.
6. An apparatus according to claim 2 wherein said inner sleeve is composed of a ceramic material lined with PTFE.
7. An apparatus according to any one of the preceding claims wherein said pipe section includes a choke flange section configured to substantially impede the propagation of microwave energy beyond said flange section when said flange section is devoid of the fluid.
8. An apparatus according to any one of the preceding claims and further including pump means to maintain a pressure differential across said pipe section to cause said fluid to flow through the pipe section.
9. An apparatus according to claim 8 wherein said pump means comprises a peristaltic pump.
10. An apparatus according to any one of the preceding claims wherein said fluid within said pipe section is maintained at a pressure above atmospheric pressure.
11. An apparatus according to claim 10 wherein said fluid within said pipe section is maintained at a pressure above atmospheric pressure by means of a pressure head from a fluid reservoir.
12. An apparatus according to claim 10 wherein a pair of pumps are disposed at either end of said pipe section to maintain the fluid within said pipe section at a pressure above atmospheric pressure.
13. An apparatus according to claim 12 wherein said pair of pumps are driven by a common drive system.
14. A method of pumping a viscous fluid through a pipe section, comprising the steps of transmitting microwave energy into the pipe section through a microwave transparent window impermeable to the fluid to elevate the temperature and thereby decrease the viscosity of the fluid, and applying a differential pressure across the pipe section to cause the fluid to flow through the pipe section.
15. A method according to claim 14 comprising the further step of directing said microwave energy into the pipe section at an acute angel with respect to a longitudinal axis of the pipe section by means of a waveguide.
16. A method according to claim 14 or claim 15 comprising the further step of substantially impeding the propagation of microwave energy beyond said pipe section when said pipe section is empty by means of a choke flange section forming part of said pipe section and disposed at one end thereof.
17. A method according to any one of claims 14 to 16 comprising the further step of maintaining the fluid within said pipe section at a pressure above atmospheric pressure.
18. A method according to claim 17 wherein said fluid is maintained at a pressure above atmospheric pressure by means of a pressure head from a fluid reservoir.
19. A method of processing a plurality of chemical reactants, comprising the steps of passing the reactants through a pipe section, transmitting microwave energy into the pipe section through a substantially microwave transparent window impermeable to the reactants, and applying a differential pressure across the pipe section to cause the reactants to flow through the pipe section.
20. A method according to claim 19 comprising the further step of directing said microwave energy into the pipe section at an acute angle with respect to a longitudinal axis of the pipe section by means of a waveguide.
21. A method according to claim 19 or claim 20 comprising the further step of substantially impeding the propagation of microwave energy beyond said pipe section when said pipe section is empty by means of a choke flange section forming part of said pipe section and disposed at one end thereof.
22. A method according to any one of claim 19 to 21 comprising the further step of maintaining the reactants within said pipe section at a pressure above atmospheric pressure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPJ1135 | 1988-10-25 | ||
| AUPJ113588 | 1988-10-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2001520A1 true CA2001520A1 (en) | 1990-04-25 |
Family
ID=3773467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002001520A Abandoned CA2001520A1 (en) | 1988-10-25 | 1989-10-25 | Microwave pipe warmer |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU4487789A (en) |
| CA (1) | CA2001520A1 (en) |
| WO (1) | WO1990004910A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3581956B2 (en) * | 2000-07-28 | 2004-10-27 | 政一 松尾 | Instant water heater |
| EP1524883A1 (en) * | 2003-10-18 | 2005-04-20 | Hartwig Pollinger | Apparatus for heating fluids transported in tubular pipelines |
| EP2086285A1 (en) | 2008-02-01 | 2009-08-05 | Anton Paar GmbH | Applicator and Apparatus for heating samples by microwave radiation |
| US9198234B2 (en) | 2012-03-07 | 2015-11-24 | Harris Corporation | Hydrocarbon fluid pipeline including RF heating station and related method |
| CN210183589U (en) * | 2019-01-22 | 2020-03-24 | 南京先欧仪器制造有限公司 | Continuous liquid material microwave treatment equipment |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU415625B2 (en) * | 1965-11-02 | 1971-07-27 | Commonwealth Scientific And Industrial Research Organization | Production of metals from their halides |
| US3495648A (en) * | 1968-03-11 | 1970-02-17 | Pet Inc | Microwave apparatus for evaporating liquid mixtures |
| US3535482A (en) * | 1968-06-26 | 1970-10-20 | Hammtronics Systems Inc | Microwave apparatus for rapid heating of fluids |
| US3555232A (en) * | 1968-10-21 | 1971-01-12 | Canadian Patents Dev | Waveguides |
| US3794801A (en) * | 1972-12-01 | 1974-02-26 | R Boles | Super heated vapor driven vehicle |
| GB2098040A (en) * | 1981-03-31 | 1982-11-10 | Sanyo Electric Co | System for and method of sterilization of food material |
| SU1238273A1 (en) * | 1983-01-20 | 1986-06-15 | Челябинский Ордена Трудового Красного Знамени Институт Механизации И Электрификации Сельского Хозяйства | Device for microwave heating of liquid products |
| US4671952A (en) * | 1985-02-20 | 1987-06-09 | C-I-L Inc. | Vaporizing liquid sulfur dioxide with microwave radiation |
| FR2588610B1 (en) * | 1985-10-11 | 1987-12-11 | Renault | PROCESS FOR REMOVAL OF CARBON PARTICLES CONTAINED IN CIRCULATING GASES, IN PARTICULAR IN EXHAUST GASES FROM COMPRESSION IGNITION ENGINES. |
| JPS6365251A (en) * | 1986-09-04 | 1988-03-23 | Tokyo Materiarusu:Kk | Heating of liquid |
| FR2614490A1 (en) * | 1987-04-23 | 1988-10-28 | Pellissier Jean Pierre | Microwave applicator for heat treatment of granular, powdery, pasty or liquid products |
-
1989
- 1989-10-25 CA CA002001520A patent/CA2001520A1/en not_active Abandoned
- 1989-10-25 AU AU44877/89A patent/AU4487789A/en not_active Abandoned
- 1989-10-25 WO PCT/AU1989/000464 patent/WO1990004910A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| WO1990004910A1 (en) | 1990-05-03 |
| AU4487789A (en) | 1990-05-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5829519A (en) | Subterranean antenna cooling system | |
| US4152567A (en) | Microwave water heater | |
| US5065819A (en) | Electromagnetic apparatus and method for in situ heating and recovery of organic and inorganic materials | |
| EP0105677B1 (en) | Endotract antenna device for hyperthermia | |
| CA2001520A1 (en) | Microwave pipe warmer | |
| US4662383A (en) | Endotract antenna device for hyperthermia | |
| AU640327B2 (en) | Retarding heat tracing system and method of making same | |
| CA1281380C (en) | Viscosity reduction apparatus | |
| KR20190069499A (en) | Radar level gauges with high temperature, high pressure (HTHP) process seals | |
| CN1759277A (en) | High-frequency heating device with steam generating function | |
| US11805578B2 (en) | Microwave processing equipment for continuous flow liquids | |
| US7055599B2 (en) | Electromagnetic coal seam gas recovery system | |
| US20220369686A1 (en) | Food production device | |
| GB2126060A (en) | High-frequency heating apparatus | |
| GB2048629A (en) | Water heating method | |
| USRE31241E (en) | Method and apparatus for controlling fluency of high viscosity hydrocarbon fluids | |
| EP0307003A2 (en) | Electromagnetic energy heating | |
| US11131171B2 (en) | Tubular protection for radiofrequency system to improve the recovery of heavy oils | |
| EP2419207B1 (en) | Coupling for joining conduits | |
| EP0323734A1 (en) | Hosepipe | |
| CN210700002U (en) | Solidification prevention device for discharge port of reaction kettle | |
| NO175700B (en) | Method and electrode system for heating media flowing through an insulated tube | |
| US5829528A (en) | Ignition suppression system for down hole antennas | |
| KR102539718B1 (en) | Product Drying Equipment | |
| US4629522A (en) | Sealing communication cable |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |