EP2312255A2 - Procédé et dispositif de nettoyage de surfaces de chauffage alimentées en gaz de fumée d'un échangeur thermique dans une installation de combustion lors de son fonctionnement - Google Patents

Procédé et dispositif de nettoyage de surfaces de chauffage alimentées en gaz de fumée d'un échangeur thermique dans une installation de combustion lors de son fonctionnement Download PDF

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Publication number
EP2312255A2
EP2312255A2 EP10013399A EP10013399A EP2312255A2 EP 2312255 A2 EP2312255 A2 EP 2312255A2 EP 10013399 A EP10013399 A EP 10013399A EP 10013399 A EP10013399 A EP 10013399A EP 2312255 A2 EP2312255 A2 EP 2312255A2
Authority
EP
European Patent Office
Prior art keywords
supply line
outer tube
cooling fluid
flue
nozzle
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.)
Granted
Application number
EP10013399A
Other languages
German (de)
English (en)
Other versions
EP2312255A3 (fr
EP2312255B1 (fr
Inventor
Peter Knapp
Achim Eckert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MVV Umwelt Asset GmbH
Original Assignee
MVV O&M GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MVV O&M GmbH filed Critical MVV O&M GmbH
Publication of EP2312255A2 publication Critical patent/EP2312255A2/fr
Publication of EP2312255A3 publication Critical patent/EP2312255A3/fr
Application granted granted Critical
Publication of EP2312255B1 publication Critical patent/EP2312255B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G1/00—Non-rotary, e.g. reciprocated, appliances
    • F28G1/16—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
    • F28G1/166—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris from external surfaces of heat exchange conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
    • F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
    • F23J3/023—Cleaning furnace tubes; Cleaning flues or chimneys cleaning the fireside of watertubes in boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
    • F28D7/106—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically consisting of two coaxial conduits or modules of two coaxial conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/003—Multiple wall conduits, e.g. for leak detection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G15/00—Details
    • F28G15/02—Supports for cleaning appliances, e.g. frames

Definitions

  • the invention relates to a method and a device for cleaning flue gas exposed heating surfaces of a heat exchanger in an incinerator according to the preamble of claim 1 and 6.
  • heat exchangers In incineration plants, in particular in Abfullverbrennungsanlagen, heat exchangers are known to be used, which are acted upon by the hot flue gases generated during combustion in order to withdraw these from the heat energy contained.
  • the constituents contained in the flue gases condense on the cooler surfaces of the heat exchangers, whereby deposits form after a certain time on these, which have thermally insulating properties and thereby worsen the transition of heat energy from the flue gas in the heat exchanger.
  • the thermal as well as the electrical efficiency of the system deteriorates disadvantageously.
  • the method for removing contaminants from heating surfaces of a heat exchanger in a flue of an incineration plant, wherein the heating surfaces are acted upon during operation of the incinerator with a cleaning fluid characterized in that for cleaning the heat exchanger a preferably dimensionally stable and heat-resistant lance is introduced from an outer tube and a supply line for the cleaning fluid received therein through an opening in the flue of the incinerator.
  • the outer tube and the supply line are continuously cooled by a cooling fluid, which flows around the supply line through an annular gap formed between the outside of the supply line and the inside of the heat-resistant outer tube.
  • the method according to the invention has the advantage that the combustion support no longer needs to be shut down for cleaning purposes and has to be driven up again after cleaning, which is associated with a high thermal outlay due to the cooling of the downstream system components and leads to considerable costs.
  • the entire system can be operated with a higher overall efficiency, as a result of the relatively cheap cleaning process, the cleaning intervals are shortened, thereby improving the efficiency of heat transfer to the heat exchanger, er schizophrenia and thus increases the thermal and electrical efficiency.
  • the method according to the invention is equally suitable for cleaning heat exchangers in vertical flues as well as in horizontal flues.
  • the cooling fluid which is supplied to the annular gap at a first outside the Rauchga, szuges arranged end exits and in the region of the second end of the outer tube in the flue, remains in the flue and with the flue gases generated by the combustion process is removed in the gaseous state.
  • the cooling fluid is a non-combustible liquid such as water, which further has the lowest possible boiling point and thus evaporated quickly.
  • water a non-combustible liquid
  • Another advantage resulting from the use of water as the cleaning medium is that it can be provided comparatively inexpensively and behaves essentially chemically neutral during the process of being followed and the downstream processes.
  • the cooling fluid flows around the supply line in a spiral shape when flowing through the annular gap.
  • This advantageously ensures that the entire surface of the supply line is flowed around by the cooling fluid, whereby the risk of differences in flow in the cooling fluid arising due to temperature differences between the side facing away from the flue gas flow side and the flue gas flow side facing the outer tube in the cooling fluid can, is reduced.
  • Another advantage of the above-described Ami exchangesform of the invention is the fact that due to the spiral-shaped or helical course of the flow in addition also result in eddies that improve the heat transfer from the outer tube to the cooling medium.
  • the cleaning fluid escape from the supply line through a nozzle arranged at the end of the supply line. This advantageously converts the pumping pressure of the cleaning fluid generated by the pump into kinetic energy of the solid particles contained in the cleaning fluid, which increases the impulse energy transmitted to the polluted surfaces upon impact and improves the cleaning effect.
  • the nozzle is arranged at a substantially 90 ° relative to the supply line angled line section and the cleaning fluid polluted heating surfaces are preferably applied from below or from the front or from the side with the cleaning fluid.
  • the outer tube can be operated with the therein received supply line for cleaning the heat exchanger in a substantially horizontal position, whereby a cleaning of the spaces between the tubes of the heat exchanger through the opening in the flue through the operating personnel convenient manner can also be made at a greater distance from the flue.
  • a nozzle is preferably used, which is laterally surmounted by the outer tube and is also flows around the cooling fluid before exiting the outer tube and / or is sprayed from the under a pressure of preferably less than 10 bar exiting cooling fluid to the nozzle to protect against overheating.
  • the cleaning fluid is a mixture of a carrier gas, in particular air and solid particles, wherein the solid particles in particular sand or / and metal balls and / or silicon carbide and / or dry ice is or contains such.
  • a carrier gas in particular air and solid particles
  • the use of air as a carrier gas is of particular advantage, since it is available as space and / or ambient air virtually unlimited available and compress in a known manner with comparatively simple means such as a compressor or the like and promote with a desired pressure through the supply line leaves.
  • sand as solid particles results in particular in combination with air as a carrier gas the advantage that it can be procured not only cost, but also chemically inactive at the prevailing temperatures and thus does not adversely affect the combustion process in chemical terms.
  • the use of dry ice particles can also be provided, with which - as with sand - a very good re-cleaning effect results, if this on the soiled surface of the Heat exchanger collisions hit. Due to the high temperatures prevailing in the flue gas, the dry ice particles are passed through the plant as gaseous carbon dioxide together with the carbon dioxide of the flue gas.
  • the solid particles used have a particle size in the range from 0.06 mm to 2 mm, in particular from 0.2 mm to 1.2 mm, since the particles of this size can be entrained particularly well in the carrier gas and, on the other hand, when discharged from the nozzle, can absorb sufficient kinetic energy to deliver it to the dirt layer on the heat exchanger surfaces. These factors advantageously affect the cleaning result and allow the use of standard pumps and nozzles.
  • the device according to the invention for carrying out the method of removing contaminants on heating surfaces of a heat exchanger of a combustion system comprises a supply line which is acted upon by a first pump, preferably a compressor, at a first end with a cleaning fluid which the supply line at a second end in the direction leaves the heating surfaces. It is characterized in that the supply line is surrounded by a heat-resistant outer tube, which encloses the Zubowleritung to form an annular gap formed between the outside of the supply line and the inside of the outer tube, and that a second pump is provided, the annular gaps of a first , Exposed outside of the flue gas from the end of a cooling fluid to fördem this under pressure through the annular gap and thereby to cool the feed continuously.
  • the device according to the invention has the advantage that the device is very resistant to very high temperatures due to its cooling, as prevail, for example, in the flues of an incinerator. It is also advantageous if the cooling fluid used leaves the outer tube at its second end and does not have to be led out again within a further tube or channel within the annular gap from the flue gas to it after a complex cooling to the starting temperature - the preferred is below 30 ° Celsius - to use again as a cooling fluid. This can be especially when using be used by water as a cooling fluid in a particularly cost-effective manner, a simple water connection with a supply pressure of 5 - 6 bar. Alternatively, other non-flammable liquids with a low boiling point can be used according to the method of the invention, for example, are conveyed by means of a pump from a dedicated tank
  • flow guide elements are arranged within the annular gap, which deflect the cooling fluid flowing through the annular gap in such a way that the cooling fluid flows around the supply line on the outside in a spiral manner.
  • the flow guide elements extend around the supply line essentially over the entire length of the outer tube and in the form of a spiral or a helix.
  • the supply line is fixed in a particularly advantageous manner in its center position in the outer tube, without coming into contact with the inner surface of the outer tube.
  • the supply line has at its disposed within the Rauchgaszugcs second end of a nozzle through which the cleaning fluid under high pressure, in particular a pressure of more than 6 bar exits.
  • the solid particles preferably contained in the cleaning fluid to transport a high kinetic energy, which home impingement on the contaminants is delivered to this in an advantageous manner, whereby the contaminants are removed reliably and with high efficiency.
  • the outer tube also encloses the nozzle so that the nozzle is also advantageously cooled by the cooling fluid exiting into the combustion chamber. It may be provided that the cooling fluid has a lower pressure than the cleaning fluid, and exits through a nozzle opening radially surrounding hole assembly from the outer tube.
  • the holes of the hole arrangement are arranged at an obliquely outward angle relative to the jet axis of the cleaning fluid, so that the cooling fluid emerges obliquely at an angle to the cleaning fluid from the openings, as a result It is avoided that the emerging cleaning fluid jet is deflected by the cooling fluid or otherwise disturbed.
  • the holes of the hole arrangement are arranged in size and position in relation to the nozzle tip such that a funnel-shaped wall of escaping cooling fluid opens around the nozzle tip in the direction of radiation, which acts in a particularly advantageous manner like a protective fluid shield around the nozzle.
  • the supply line at the first end of the outer tube is frontally out of this out, and that the first end of the outer tube with a seal, in particular a stuffing seal, is closed, as a result advantageous straight line routing is obtained, and the supply line in particular without additional couplings and bends liquid-tight can be led out of the outer tube.
  • a movable frame which has a receptacle and / or a guide for the outer tube, in which the outer tube displaceable back and forth and simultaneously in the horizontal and / or vertical direction and / or about the longitudinal direction of the External tube is received rotatably.
  • the guide in which the outer tube is received, pivotally mounted about a first pivot axis and a second pivot axis via a first and a second hinge pin, wherein the first pivot axis is preferably perpendicular to the second pivot axis and the pivot axes are arranged advantageously horizontally and vertically.
  • the guide can be arranged with the hinge pin on a particular höhcnvcr technicallyen and / or laterally adjustable cross member to position the outer tube relative to the opening in the flue in the vertical direction and / or horizontal direction, without raising the frame and the pipe as a whole and move to have to.
  • the supply line is preferably a flexible hose, in particular a hose for supplying a mixture of air and blasting sand, as is known, in particular from the field of sandblasting technology of exterior surfaces of buildings, etc.
  • a flexible compressed air hose as it is generally used for sandblasting
  • this hose which is subject to only a small inner Verschlciß due to its flexibility through the guided air-blasting sand mixture, cost and in reinforced quality can be purchased by the meter.
  • the advantage is obtained by the outer tube and the guided between the outer tube and the tube cooling medium, that in the rule with rubber-like material coated pressure tube can also be used within the heat exchanger, without the tube is impaired or even destroyed by the high temperatures.
  • a device 1 which comprises an outer tube 4 with a centrally located therein supply line 2, wherein in the, bounded by the outside of the supply line 2 and the inner wall of the outer tube 4 annular gap 6 are provided 6 which are in the form of a helix extend around the supply line 2 around.
  • a seal 34 in particular a Stopfdiehtung provided, through which the supply line 2 is frontally out of the first end 8 of the outer tube 4 out to the supply line 2 to a first pump 18 for the promotion of the air-sand mixture to join.
  • the enlarged view of the seal 34 in Fig.1 comprises a threaded cap 38 which is screwed on a co-operating with the threaded cap 38 inner and outer threads 36 on the first end 8 of the outer tube 4 and in this case a fonnelastische stuffing box 40 between the threaded cap 38 and the outer tube 4 jammed.
  • the illustration in Fig. 1 can be seen that in the region of the first end 8 of the outer tube 4, a connection 42 for a hose 22 for connection to a second pump 20 - Fig. 2 shown - or a supply line for the cooling fluid is arranged.
  • Fig. 1 illustrated that the supply line 2 and the outer tube 4 are angled at its second end 10 by 90 ° and that at the second end 10 of a nozzle 24 having a nozzle opening; 26 is provided, from which the air-sand-Gewisch 16 exits.
  • the nozzle 24 in the illustrated embodiment is preferably enclosed by the outer tube 4 until it is close to the nozzle opening 26.
  • the outer tube 4 is closed by a preferably annular cover 28 having a passage for the nozzle opening 26 and a hole assembly 30 having a plurality of holes 32.
  • the device 1 of the invention is introduced below the tube assembly of the heat exchanger 48 through a maintenance opening 50 in the lower region of the side wall of the flue 46 in this to apply the heat exchanger 48, for example, from below with the air-sand mixture 16 ,
  • the supply line 2 is led out in erfindungsgcffleßer manner from the outer tube 4 and connected to a first pump 18 for conveying the air-sand mixture 16 through the supply line 2.
  • the connection 42 for the cooling fluid 14 is, as in Fig. 2 shown connected by a hose 22 to a second pump 20, which serves to convey the cooling fluid 14 through the annular gap 6, which is formed between the supply line 2 and outer tube 4.
  • Fig. 3 comprises a frame 54 for holding and moving the device 1 according to the invention within the flue 46 a frame 56, which is preferably connected via two U-profile support with feet 60.
  • the outer tube 4 is movably received in an array of guide rollers 70, which are connected to each other by spacers 72 spaced from the guide rollers 70 L-prfile 74.
  • the two lower L-profiles 74 are connected via a first hinge pin 66 with a fork 64 in order to move the outer tube 4 accommodated in the arrangement of guide rollers 70 about a first pivot axis 76 in its position relative to the horizontal.
  • the cubel 64 is connected at its lower end via a second hinge pin 68 with a cross member 62 and rotatable relative to this in the horizontal, so that the device 70 received in the assembly 70, 72, 74 follows this rotational movement
  • the illustration of Fig. 3 can be seen that the cross member 62 is preferably mounted displaceably along the lateral frame members 56, so that the cross member 62, as indicated by the arrow 80, in its position relative to the feet 60 can be moved up and down.
  • the height-adjustable cross member 62 has not shown in detail for holding the set height locking means over which the cross member 62 is preferably detachably connected to the frame 56 during operation of the device 1 according to the invention.
  • Fig. 4 which shows a plan view of the frame 54 according to the invention, can finally be removed, the guide rollers 70 are viewed in the longitudinal direction of the outer tube 4 on the L-profiles 74 in pairs spaced from each other, so that the outer tube 4 in the direction of arrow 82 linear slidably guided and stored.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Incineration Of Waste (AREA)
EP20100013399 2009-10-09 2010-10-07 Procédé et dispositif de nettoyage de surfaces de chauffage alimentées en gaz de fumée d'un échangeur thermique dans une installation de combustion lors de son fonctionnement Not-in-force EP2312255B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910048879 DE102009048879A1 (de) 2009-10-09 2009-10-09 Verfahren und Vorrichtung zur Reinigung von rauchgasbeaufschlagten Heizflächen eines Wärmetauschers in einer Verbrennungsanlage während des Betriebs derselben

Publications (3)

Publication Number Publication Date
EP2312255A2 true EP2312255A2 (fr) 2011-04-20
EP2312255A3 EP2312255A3 (fr) 2014-04-09
EP2312255B1 EP2312255B1 (fr) 2015-01-07

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ID=43447840

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20100013399 Not-in-force EP2312255B1 (fr) 2009-10-09 2010-10-07 Procédé et dispositif de nettoyage de surfaces de chauffage alimentées en gaz de fumée d'un échangeur thermique dans une installation de combustion lors de son fonctionnement

Country Status (2)

Country Link
EP (1) EP2312255B1 (fr)
DE (1) DE102009048879A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPD20120300A1 (it) * 2012-10-16 2014-04-17 Fare S R L Procedimento di pulizia di forni fusori a bacino per la produzione di articoli in vetro
CN106678846A (zh) * 2016-12-14 2017-05-17 北京神雾环境能源科技集团股份有限公司 吹灰器
CN113606594A (zh) * 2021-08-11 2021-11-05 上海泰欣环境工程有限公司 一种垃圾焚烧电厂烟气余热回收利用装置

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
RU191520U1 (ru) * 2018-11-26 2019-08-12 Акционерное общество "Красноярский машиностроительный завод" Устройство для струйной обработки поверхности нагрева котельного агрегата
DE102018222765A1 (de) * 2018-12-21 2020-06-25 Siemens Aktiengesellschaft System und Verfahren zur Reinigung von Wärmetauscherrohren

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPD20120300A1 (it) * 2012-10-16 2014-04-17 Fare S R L Procedimento di pulizia di forni fusori a bacino per la produzione di articoli in vetro
WO2014060322A1 (fr) * 2012-10-16 2014-04-24 Fare S.R.L. Procédé de nettoyage de fours de fusion en cuve pour réaliser des articles en verre
JP2016500632A (ja) * 2012-10-16 2016-01-14 ファーレ・ソシエタ・ア・レスポンサビリタ・リミタータＦａｒｅ Ｓ．Ｒ．Ｌ． ガラス製品を作るためのタンク溶融炉を清掃するための方法
US10112283B2 (en) 2012-10-16 2018-10-30 Fare S.R.L. Method for cleaning tank melting furnaces for making glass items
CN106678846A (zh) * 2016-12-14 2017-05-17 北京神雾环境能源科技集团股份有限公司 吹灰器
CN113606594A (zh) * 2021-08-11 2021-11-05 上海泰欣环境工程有限公司 一种垃圾焚烧电厂烟气余热回收利用装置

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Publication number Publication date
EP2312255A3 (fr) 2014-04-09
EP2312255B1 (fr) 2015-01-07
DE102009048879A1 (de) 2011-04-21

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