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
  • F28G15/00—Details
  • F28G15/02—Supports for cleaning appliances, e.g. frames
• • 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
  • 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
  • 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
  • F28G15/04—Feeding and driving arrangements, e.g. power operation

Definitions

• Water lance blower for cleaning heat exchangers especially a combustion chamber heating surface
• Water lance blower for cleaning heat exchangers in particular a combustion chamber heating surface in steam boilers, which is attached to the mouth of the blowpipe via a universal joint in a hatch or a wall box of the combustion chamber wall and whose rear part of the blowpipe is arranged in a guide that can be moved vertically and horizontally on one known linear unit is attached via a further universal joint, which has an inner part as a sleeve in which the blow pipe is axially displaceable, the blow pipe having a nozzle and a nozzle head
• the invention relates to a water lance blower for cleaning heat exchangers, in particular a combustion chamber heating surface in steam boilers, which is attached to the mouth of the blowpipe via a universal joint in a hatch or a wall box of the combustion chamber wall and whose rear part of the blowpipe is arranged in a guide which is vertically displaceable and horizontally movable is attached to a linear unit known per se via a further universal joint, which has an inner part as a sleeve in which the blowpipe is axially displaceable, the blowpipe having a nozzle and a nozzle head
• a water lance blower for cleaning heat exchangers is already known, which is attached to the mouth of the blowpipe via a universal joint in a hatch of the combustion chamber wall and in which the rear part of the blowpipe is arranged in a guide which is arranged on a lower the right spindle can be shifted upwards, the vertical spindle being horizontally displaceable on the top and bottom of a horizontal spindle
• the horizontal spindles are stored at their ends in a box, fastened there and are operatively connected on one side.
• the guide is formed from a housing, that is not rotatable on the vertical spindle and carries a fork-shaped holder on the side, in which a gimbal-shaped cage is arranged, which is provided with a sleeve in its inner part and then receives the blow tube axially displaceably.
• the horizontal spindles in this water lance blower surrounded by a bellows to d To protect the spindles from dirt
• a disadvantage of this water lance blower is that the lower horizontal spindle is driven by a roller chain from the upper horizontal spindle. Due to the manufacturing tolerance that exists with a roller chain and the length change of the roller chain that occurs during operation, the lower horizontal spindle is re-adjusted in both sides Box required
• a water lance blower that is inserted in a hatch of the combustion chamber wall via a special box, provided with separate nozzles, guided over two horizontal and one vertical spindle and adjusted by means of a fork-shaped holder with an angle scale and plug notch (DE 196 37 700)
• Both conventional water lance blowers have two horizontal and one vertical spindles, which are moved by asynchronous motors, the vertical spindle holding the cardan joint for the blowpipe guide via a fork-shaped holder
• both blasers are only possible via asynchronous motors by means of incremental encoders after the reference points of the blown pattern have been specified by pulse payment. Due to the cycle times of the programmable logic controller (PLC) and play in the spindle nuts, the process is fraught with inaccuracies.
• PLC programmable logic controller
• the design of the blasers is complex and relatively expensive
• the attachment or guidance of the blowpipe via the fork-shaped receptacle is unstable.
• this blaser can be adapted to various boiler designs, particularly in confined spaces, only with restrictions.
• the blowing angle is restricted to max. 60 °.
• the blaster can only be transported as a whole
• a design of the nozzle head and the nozzle is described in DD 205 976.
• the integration of an axially displaceable blowpipe for cleaning heat exchangers in the combustion chamber wall is shown in DD 235 103
• an arrangement for cooling a water lance blower in which the blower head of the blower is formed from two V-shaped blow nozzles at an angle to one another (DD 268 759 A1).
• An expanding jacket tube is arranged around the two hot air nozzles, through which cooling air is blown.
• the expanding jet of cooling air causes inadequate cooling of the nozzles.
• the nozzle center is not exposed to cooling air at all. Deposits cannot be effectively removed with it
• a steam nozzle in which the steam-loaded nozzle is cooled by air through radial air slots (DE-PS 202 062).
• the formation of an effective protective veil around the nozzle is not possible with radial protection.
• the nozzle is also rigid and not designed to be movable
• the invention is based on the object of developing a water lance blower which can be transported in individual parts without problems, is easy to assemble and repair, exact control and high repeatability of the blow pattern allows, without causing increased production costs, as well as preventing contamination of the nozzle head as far as possible, or achieving constant cleaning without complex measures, so that there is no reduction in the escaping nozzle jet due to caking and the cooling effect at the nozzle to improve
• the horizontally movable and highly adjustable linear unit known per se is guided over a cross slide on a vertically arranged linear unit which is attached to the boiler wall via an auxiliary frame and two fastening brackets
• the Cardan joint arranged on the linear unit is designed as a closed double frame construction and the outer frame in its upper area is connected via a spacer with ribs on the linear unit via two flanges, the connecting flange for receiving a bolt having a recess so that an upper and lower pivot point arises and the bolt is fastened to the inner frame via a further spacer, which receives the blow tube guiding sleeve in its center via a cross bolt, which has a bellows receiving connecting piece on each side that a connecting piece is arranged between the nozzle head and the front universal joint, which has a conical extension in the area of the nozzle fitted in the nozzle head, a crown-shaped thickening fitted in this in the inner area of
• linear units are interchangeably designed depending on the boiler and can also be arranged at an angle depending on the space available
• the bellows attached to the connecting pieces are connected to the blowpipe.
• the profile for attaching the linear units to the boiler wall is preferably designed as a U-profile with a flange
• a further special feature of the invention is that the pressure difference between the boiler house and the combustion chamber is exploited in a targeted manner via the recesses of the connecting piece arranged in a circle around the nozzle and its integration into the front universal joint. This pressure difference is thus used in a particularly advantageous manner Gaps provided expansion of the connector used that the air flow without changing its direction significantly, on the one hand flows around the nozzle in a veil-shaped manner and on the other hand is increased in its flow rate via the conically enlarged inlet and the recesses of the distributor
• the water jet is largely freed from turbulence, so that a maximum amplification and concentration of the jet and cleaning effect is achieved by the interaction according to the invention of a directed water jet and a bundling air flow
• the construction of the blaster is connected via the subframe 1 by means of a U-profile 2 and mounting flange 3 to the boiler wall 4 and via the mounting brackets 5, 6 to the wall box 7 (FIGS. 1 and 2) a horizontal linear unit 9, 10, which are connected to one another via a cross slide 11, and on the other hand, via a front and a rear cardan joint 12, 13, while the front cardan joint 12 is used in a round shape with a small gap width, the rear joint 13 as a closed double frame construction 14 with an outer frame 15 and an inner frame 16.
• the outer frame 15 is connected to the vertical linear unit 9 via the spacer 17 and ribs 18 and flange 19, 20.
• the inner frame 16 is connected via the recess 21 and spacer 22 connected to the outer frame 15 with vertical bolts 23.
• the blowpipe guide 2 4 (FIG. 4) is held in the center by means of the horizontal bolt 25 in the inner frame 16.
• the blow pipe guide 24 has connecting pieces 26, 27 on both sides for receiving a respective bellows 28, 29, which are connected at their other ends to the blow pipe 8 and so keep the permanently sliding guidance of the blowpipe 8 clean even in the event of heavy dust and dirt accumulation (FIG. 5).
• Each linear unit 9, 10 is driven by a servo motor 30, 31
• the servomotors 30, 31 are connected to the respective control unit 34, 35 via the resolvers 32, 33
• the nozzle head 36 fastened to the blow tube sleeve 24 has the nozzle 37 in its head region (FIG. 6)
• the connecting piece 40 is fastened / fitted via its ring-shaped thickening 39 in the front universal joint 12 and is characterized by a cylindrical part 46, an adjoining conical extension 38 and an enlarged cylindrical part 49 (FIG. 7).
• the connecting piece has 40 has a distributor ring 42 with recesses 41 which engages in a recess 43 of the nozzle head 36 and is fastened to it
• the swirl device 44 arranged in the inlet area of the blow tube sleeve 24 has mounting plates 45 for rectifying the water jet flow (FIGS. 9 and 10)
• the mode of action is as follows
• the water lance blower (WLB) is used to remove dirt from heating surfaces in firing systems.
• the water introduced suddenly cools down the devastation on the hot tube bundles, causing the slag to flake off
• the water is pumped at high pressure through a blowpipe, at the end of which there is a nozzle (not shown).
• the blowpipe is clamped in the rear part in an axis system, which is able to approach any XY coordinate within the mechanical limits - ren
• the water jet can coat a cone / pyramid of up to ⁇ 100 ° with respect to the axial center of the lance via the solution according to the invention
• the axes are moved by servo drives, which are characterized by their positioning accuracy compared to other systems.
• servo drives After referencing via an external limit switch - after switching on the supply voltage - all travel commands relating to acceleration, braking, speed and positioning are entered into the motor Integrated position measuring system (resolver) monitors and controls Deviations from the target position (even after positioning) are automatically tracked. This is referred to as position control.
• This system suppresses inaccuracies in the traversing movement that resulted, for example, from mechanical aging.
• programming of any movements is possible - so-called blow figures. These are stored in the control units of the axes. After initiating the program, the WLB independently processes the blow figure.
• the water jet is formed in such a way that it is evaporated in the nozzle 37 as a laminar flow, so that effective cleaning can take place even in large steam generators with considerable diameters
• ⁇ can be disassembled for transport ⁇ easier to assemble and disassemble

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Chemical & Material Sciences (AREA)
• Incineration Of Waste (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
• Air Supply (AREA)
• Cleaning In General (AREA)
• Nozzles (AREA)
• Turbine Rotor Nozzle Sealing (AREA)
• Cleaning By Liquid Or Steam (AREA)
• Gas Burners (AREA)

Applications Claiming Priority (5)

Publications (2)

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ID=26054152

Family Applications (1)

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• 2000
  • 2000-07-07 DE DE50005801T patent/DE50005801D1/de not_active Expired - Fee Related
  • 2000-07-07 WO PCT/DE2000/002265 patent/WO2001004561A1/fr active IP Right Grant
  • 2000-07-07 EP EP00954323A patent/EP1198693B1/fr not_active Expired - Lifetime
  • 2000-07-07 AU AU66836/00A patent/AU6683600A/en not_active Abandoned
  • 2000-07-07 CN CNB008114536A patent/CN1135361C/zh not_active Expired - Fee Related
  • 2000-07-07 PL PL00352942A patent/PL352942A1/xx unknown
  • 2000-07-07 RU RU2002103162/12A patent/RU2229077C2/ru not_active IP Right Cessation
  • 2000-07-07 DK DK00954323T patent/DK1198693T3/da active
  • 2000-07-07 AT AT00954323T patent/ATE262671T1/de not_active IP Right Cessation
  • 2000-07-07 PT PT00954323T patent/PT1198693E/pt unknown
  • 2000-07-07 ES ES00954323T patent/ES2220512T3/es not_active Expired - Lifetime

Non-Patent Citations (1)

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