SE193092C1

SE193092C1 -

Info

Publication number: SE193092C1
Authority: SE
Publication date: 1964-01-01

Description

Prioritet begard frau den 15 mars 1960 (Belgien) Foreliggande uppfinning avser en anordning for rengliring av utvandigt upphettade tuber i en varmevaxlare, sasom en angpanna, overhettare eller dylikt. Bland de talrika typer av angpannor, overhettare, ateroverhettare och ekonomisers som forekomma, finns det sadana, vid vilka eldytan utgores av en serie tuber, som utvandigt utsattas for inverkan av de varma gaserna, exempelvis aro angpannor med atervirming av rokgasvarme kanda, yid vilka tuberna som bilda eldytan aro anbragta i slingor, som i stort antal hanga fled i rolgaskanalerna &On eldstaden; om rokgaserna, som fOras ungefar vinkelratt eller nastan parallellt med tuberna, avge atminstone en del av sina kalorier, avge de aven. en del sot under transporten. Detta sot avsattes ph tuberna och overdrar dem med ett mer eller mindre isolerande lager, som under alla forhallanden dr till forfang Mr en god varineutvaxling mellan rOkgaserna och tuberna och f8r en fri passage for gaserna mellan tuberna, varigenom den atervunna varmemangden minskas och gaserna utsattas fOr motstand vid passagen, dvs. angpannans verlmingsgrad minskar. Priority claimed from 15 March 1960 (Belgium). The present invention relates to a device for cleaning externally heated tubes in a heat exchanger, such as a steam boiler, superheater or the like. Among the numerous types of steam boilers, superheaters, overheaters and economists that occur, there are those in which the fire surface consists of a series of tubes which are externally exposed to the influence of the hot gases, for example steam boilers with re-heating of flue gas hot jug, yid which tubes which form the fire surface aro placed in loops, which in large numbers hang fled in the rolgas channels & On the fireplace; if the flue gases, which are carried approximately perpendicularly or almost parallel to the tubes, emit at least part of their calories, they also emit. some soot during transport. This soot is deposited on the tubes and overlays them with a more or less insulating layer, which in all circumstances leads to a good exchange of smoke between the flue gases and the tubes and for a free passage of the gases between the tubes, thereby reducing the recovered heat and exposing the gases to resistance at the passage, ie. angpannan's degree of elongation decreases.

For att avhjalpa denna olagenhet och eliminera sotavsattningen har man anvant olika anordningar, av vilka vissa astadkomma en horisontell skakning av eldytorna, medan andra astadkomma en vertikal skakning; anordningar aro Oxen kanda som astadkomma vibrationer i vissa delar av de ytor som skola rengoras, liksom anordningar som verka genom blasning, antingen medelst anga eller med komprimerad luft. In order to remedy this disorder and eliminate soot deposition, various devices have been used, some of which cause a horizontal shaking of the fire surfaces, while others cause a vertical shaking; devices aro Taurus kanda which cause vibrations in certain parts of the surfaces to be cleaned, as well as devices which act by blowing, either by means of steam or with compressed air.

Foreliggande -uppfinning avser en anordning for rengoring air utvandigt upphettade tuber i en varmevaxlare, upphangda i en rokgasgang medelst ett av en vagn uppburet, langstrackt sotningsdon och kannetecknas huvridsakligen dhrav, att detta i sin framre ande är forsett med ett huvud med storre tvardimension an avstandet mellan tva angransande tuber, mellan vilka sotningsdonet passerar temporart efter att ha utiivat en sat och en isfirskiljningskraft under vagnens framskjutning, varigenom tuberna sattas i svangningsrorelse och bringas att stOta ihop med varandra. The present invention relates to a device for cleaning externally heated tubes in a heat exchanger, suspended in a flue gas passage by means of an elongate socket supported by a carriage and can be characterized as having a head which is provided in its front spirit with a head of larger transverse dimension. between two adjacent tubes, between which the sooting device passes temporarily after exerting a set and an ice-separating force during the projection of the carriage, whereby the tubes are set in oscillating motion and made to collide with each other.

Uppfinningen beskrives narmare nedan i samband med atfoljande ritning, som askadliggor tva utforingsformer av uppfinningen, varvid fig. 1 schematiskt och i perspektiv visar en sotningsanordning enligt uppfinningen, vid vilken den fram och atergdende rorelsen erhalles genom omvandning ay motorns rotationsriktning och fig. 2 i perspektiv visar en anordning, i vilken motorn alltid gar i samma riktning, varvid den fram- och aterghende rorelsen erhalles ph mekanisk vag. The invention is described in more detail below in connection with the following drawing, which illustrates two embodiments of the invention, wherein Fig. 1 schematically and in perspective shows a sooting device according to the invention, in which the reciprocating movement is obtained by turning in the direction of rotation of the engine and Fig. 2 in perspective shows a device in which the motor always goes in the same direction, whereby the forward and return movement is obtained ph mechanical vaguely.

I utfOringsformen enligt fig. 1 visas hur i en rokgaskanal 2, i vilken rokgaserna passera i pilens X riktning, en serie tuber 3 hanga ned I slingor. I kanalens vagg 2a Or anbragt en hylsa 4, som Or tillsluten av en packdosa 5, genom vilken passerar ett sotningsdon 6, som avslutas ay ett huvud 6a. Sotningsdonet Or fastsatt vid en vagn 7, forsedd med rullar 8, som Oro belagna i en rullbana 9, bildad ay tva U-balkar. De hada andarna av en kedja 10 Oro fasta vid vagnen, och kedjan passerar Over tandhjul 9a, 9b, belagna vid rullbanans 9 andar och Over ett drivhjul 11 pa utgangsaxeln till en reduktionsvaxel 12, som drives av en motor 13, vars rotationsriktning Or omkastbar. Alit efter rorelseriktningen hos kedjan 10 forflyttas vagnen i den ena eller andra riktningen pa rullbanan. I del p0 ritningen visade vilolaget Or sotningsdonet 6 helt tillbakadraget ur ragaskanalen 2, varvid huvu- 2— — det viler i hylsan 4. Vid slutet av varje slag hejdas rorelsen plasligt genom inverkan av en snabb elektromagnetisk broms 15. In the embodiment according to Fig. 1 it is shown how in a flue gas duct 2, in which the flue gases pass in the direction of the arrow X, a series of tubes 3 hang down in loops. Arranged in the cradle 2a Or of the channel is a sleeve 4, which Or is closed by a stuffing box 5, through which a sooting device 6 passes, which is terminated by a head 6a. The sooting device Or attached to a carriage 7, provided with rollers 8, which Oro are covered in a roller conveyor 9, formed by two U-beams. The spirits of a chain 10 are fixed to the carriage, and the chain passes over gears 9a, 9b, coated at the spirits 9 of the roller conveyor and over a drive wheel 11 on the output shaft of a reduction shaft 12, driven by a motor 13 whose direction of rotation is reversible. Depending on the direction of movement of the chain 10, the carriage is moved in one or the other direction on the runway. In part of the drawing, the resting layer Or shows the sooting device 6 completely retracted from the ragas channel 2, the main 2— - it rests in the sleeve 4. At the end of each stroke the movement is stopped suddenly by the action of a fast electromagnetic brake 15.

Om vagnen 7 forflyttas i pilens Y riktning, tranger sotningsdonet 6 in i rakgaskanalen och dess huvud 6a drives in mellan muffar 3a, som Oro anbragta omkring de bada narliggande tuberna 3b i varje tubslinga. Genom sotningsdonets rörelse, som foretages med en viss hastighet, astadkommes forst en stot mot tubslingan och darefter i rakans forflyttningsriktning en indrivning foljd av en isardragning av tuberna vid muffarna; genom den forsta stoten och indrivningen bibringas tubslingan en svangningsrOrelse, sa att den slar emot angransande tubslingor, vilka erhalla stotar jamforbara med smh hammarslag. Sam-ma verkan upprepas for varje tubslinga alit efter huvudets 6a framflyttning I kanalen. Tubslingornas svangningar begransas av an-slag 14. DO sotningsdonet 6 Or tillbakadraget till det visade vilolaget, befinner det sig utanfor kanalen och undandras kontakt med rokgaserna, som darigenom ej kunna inverka forstorande ph det genom korrosion och hog temp eratur. If the carriage 7 is moved in the direction of the arrow Y, the sweeping device 6 penetrates into the shaving gas channel and its head 6a is driven in between sleeves 3a, which are arranged around the two adjacent tubes 3b in each tube loop. By the movement of the sooting device, which is carried out at a certain speed, first a thrust is effected against the tube loop and then in the direction of movement of the rake a drive-in followed by an ice-pulling of the tubes at the sleeves; through the first thrust and the drive, the tubing loop is imparted a pivoting movement, so that it strikes adjacent tubing loops, which obtain shocks comparable to small hammer blows. The same effect is repeated for each tube loop alit after the head 6a advances in the channel. The oscillations of the tubing loops are limited by abutment 14. DO the sweeping device 6 If retracted to the resting layer shown, it is outside the duct and avoids contact with the flue gases, which thereby cannot affect the magnifying ph through corrosion and high temperature.

I den i fig. 2 visade andra utforingsformen Or vagnen 16 i sidled forsedd med rullar 16a, 16b som lopa i rullbanor 17a resp. 17b. Stativet Or forsett med tva. sidokedjor 18a, 18b som uppbaras av tandhjul 19a, 19b. Dessa kedjor hallas alltid i rorelse i samma riktning medelst en transmission 20, som drives av en reduktionsvaxel 21, till vilken via en koppling 23 en motor 22 Or kopplad. Motorn 22 Or forsedd med en elektromagnetisk broms 24, och alla dessa delar Oro monterade i stativet. 1 vagnens 16 sidova.ggar Oro tva vertikala slitsar 25a, 25b urtagna, i vilka en medbringarstang 26 Or forskjutbar, vars bada andar Oro fastsatta vid kedjorna 18a och 18b p0 sadant satt, att vagnen medfores av stangen 26 forst i den ena riktningen och sedan i den andra, varvid andringen av rorelseriktningen astadkommes, da de lankar som uppbara stangen 26 passera Over de yttre tandhjulen 19a, 19b. Denna utforingsform Or forsedd med tvh sotningsdon 27, men det Or tydligt att endast ett eller flera kunna anvandas pa samma satt som vid anordningen enligt fig. 1. In the second embodiment Or shown in Fig. 2, the carriage 16 is laterally provided with rollers 16a, 16b which run in roller tracks 17a resp. 17b. Stand Or continue with tv. side chains 18a, 18b supported by gears 19a, 19b. These chains are always kept in motion in the same direction by means of a transmission 20, which is driven by a reduction shaft 21, to which a motor 22 Or is connected via a coupling 23. The motor 22 Or is equipped with an electromagnetic brake 24, and all these parts Oro mounted in the stand. In the side walls of the carriage 16 are two vertical slots 25a, 25b recessed, in which a carrier rod 26 is displaceable, the two ends of which are fastened to the chains 18a and 18b so that the carriage is carried by the rod 26 first in one direction and then in the second, whereby the change of the direction of movement is effected, as the tongues carrying the rod 26 pass over the outer gears 19a, 19b. This embodiment is provided with two sooters 27, but it is clear that only one or more can be used in the same way as with the device according to Fig. 1.

Den elektromagnetiska bromsen 24 Or inrattad att stoppa mekanismen vid slutet av en arbetscykel, da sotningsdonen befinna sig i sitt tillbakadragna lage. Sotningsdonet och dess huvud kunna vara utforda ihaliga och rOrelsen, som Oven kan astadkommas medelst hydrauliska och pneumatiska medel, kan utforas Iran den ena anden till den andra eller vara fram- och atergaende, dessutom kan sot- ningsdonets huvud eventuellt bytas ut mot en borste eller nagot annat medel som underlattar rengoringen av tuberna. The electromagnetic brake 24 Or designed to stop the mechanism at the end of a work cycle, when the sooters are in their retracted position. The sooting device and its head can be challenging and the movement, which can also be effected by means of hydraulic and pneumatic means, can be performed in Iran one by one to the other or be reciprocating, in addition the sooting device head can possibly be replaced by a brush or any other means that facilitates the cleaning of the tubes.

Manavermekanismen kan vara utford sO, att sotningsdonet efter varje slag eller efter ett visst antal slag angriper ett annat omrade av tuberna ph sadant satt, att den kommer i kontakt utmed hela deras langd eller med en del av denna.The maneuvering mechanism can be so challenged that the sweeping device, after each stroke or after a certain number of strokes, attacks another area of the tubes in such a way that it comes into contact along their entire length or with a part of it.

Claims

Patent claim:

Device for cleaning externally heated tubes in a heat exchanger, such as a steam boiler, overheater, or the like, suspended in a ragas passage (2), by means of an elongate sooting device (6) supported by a carriage (7), characterized in that this in his front spirit Or provided with a head (6a) with larger two-dimensional On the distance between two. adjacent tubes (3), between which the sooting device (6) passes after exerting a state and an ice-separating force during the projection of the carriage (7), whereby the tubes (3) are set in oscillating motion and caused to collide with each other.

Device according to patent claim 1, characterized in that the head (6a) of the sooting device strikes against the tubes to be cleaned in an area where the tubes (3b) are provided with sleeves (3a) or plates for protection against wear.

Device according to one of the preceding patent claims, characterized by abutments (14) which limit the oscillations of the tubes.

Device according to claim 1, characterized in that the roller conveyor (9) of the carriage (7) is completely covered outside the flue gas passage (2).

Device according to claim 1, characterized in that the sooting device (6) passes through a cradle (2a) in the ragas passage (2) during sooting, in front of which it is stationed at rest.

Device according to claim 5, Unsigned in that the flue gas passage cradle (2a) Or is provided with a sleeve (4), the holding of a stuffing box (5), through which the sooting member (6) passes, its head (6a) at the retracted layer Or coated in and closing the sleeve (4).