DD235102B1 - WATER LIGHT BLADDER FOR CLEANING HEAT TRANSFER - Google Patents

Description

For this 2 pages drawings

The invention relates to a water lance blower for cleaning heat exchangers, in particular a Brennkammerheizfläche in steam generators, which is attached to a pivotable roller guide and is pivotally mounted by means of a ball joint in a hatch of the combustion chamber wall.

The cleaning of the combustion chambers of steam boilers of high power during operation takes place i.a. also with the help of water lance blowers, which deliver a bundled stream of water through the firebox to the opposite wall.

As a result of the occurring thermal shock and the kinetic water jets energy, a spalling of soils from soot, slag and ash is effected. In this case, the blower tube, which has a central blowing nozzle, articulated via a roller guide with a superimposed movements exporting drive. To clean the water lance blower is moved up to an open hatch, or the blowpipe is retracted by a stored in the hatch pipe piece into the combustion chamber. For the thermal and mechanical protection of the blowing nozzle, the water lance blower is swung out after the cyclic cleaning process or moved back linearly. This requires a complex, trouble-prone mechanics, which also makes automation of the cleaning process very difficult. In addition, multiple deflections of the water supply system are required in these solutions, which are associated with high pressure losses.

In order to avoid a false air inlet into the boiler and pollution from the boiler out, the pipe feedthrough must be formed by the combustion chamber wall as close as possible.

For swiveling Wasserlanzenbläser it is known to already store the fan head in a hatch of the combustion chamber wall by means of a ball joint (DD 145476).

The disadvantage of this solution is that the hatch in the combustion chamber wall to divide horizontally and insert the ball joint in the incorporated spherical bore. By entering contaminants in the sliding surfaces of the ball joint they wear out very quickly, and the service life is therefore very low, and the sealing and pivoting function is no longer guaranteed because the ball joint jammed.

The invention has the object of providing a water lance blower mounted on a pivotable roller guide and is pivotally mounted by means of a ball joint in a hatch of the combustion chamber wall, so that the blow pipe does not have to be moved axially, the diameter of the pipe passage through the hatch reduced and a self-cleaning effect is achieved between the sliding parts of the ducting.

This is inventively achieved in that the front of the blowing nozzle a blow-molded rigidly flanged and the mouth of the blowing nozzle is inserted into the blow-through, the blow-through cylinder rigidly fixed in the ball joint formed from a ball joint and slotted in its free part or provided with holes. The blow-through cylinder may also be formed from a plurality of spacer bars connecting the ball segment and the flange of the blowing nozzle.

The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawing show

Fig. 1: a longitudinal section through the water lance blower

FIG. 2: the mounting of the water lance blower in a hatch of the combustion chamber wall FIG. 3: a blow-through cylinder formed by spacer rods.

The water lance blower consists essentially of a blowpipe 15 and a blow-through cylinder 2. The blowpipe 15 takes on the tip of a centric blow nozzle 1 and is provided at the inflow end with a connection piece 16 for a corrugated tube. In front of the tuyere 1, the through-blowing cylinder 2 is rigidly flanged by a flange 12, the mouth 3 of the tuyere 1 being inserted into the blow-through cylinder 2. The blow-through cylinder 2 is rigidly secured in a ball joint formed by a ball segment 4 and slotted in its free part or provided with a plurality of holes 5. The ball segment 4 is inserted into a hemispherical elaboration of the hatch closure plate 6 and held by the other side of a cover plate 7 with a spherical elaboration. The cover plate 7 is attached via attached to the hatch cover plate 6 tabs 8 and inserted into the tabs 8 wedges 9.

The ball segment 4 is provided centrally on the outer circumference with a groove 10. Between the hatch closure area 6 and the cover plate 7 to the ball segment 4 leading groove 11 is formed. The blow-through cylinder 2 may also be formed of a plurality of spacer rods 13 connecting the spherical segment 4 and the flange 12 of the blowing nozzle 1. Due to the rigid attachment of the blow-through cylinder 2 in the ball segment 4, an additional locking of the blower tube 15 on the pivotable roller guide 17 to which the blowpipe 15 is attached, no longer required. A lock would be necessary for the reason that the blowpipe 15 would otherwise move backwards by the recoil force of the medium.

The ball segment 4 is about twice as thick as the hatch closure plate 6 is formed, and the groove 11 is a free Opening down. In the cylindrical portion of the blowpipe 15 is a Entdraller 18, so that the water turbulence in the Inflow cone of the tuyere 1 enters. By arranging slots or holes 5 in the blowing cylinder 2 or

its latticed configuration prevents the formation of a vacuum in the blow-by cylinder 2 during operation, which would result in a rupture of the jet of water behind the tuyere 1.

In the solution according to the invention, the blowing nozzle 1 is set back relatively far and is no longer moved axially,

whereby the tuyere 1 is largely protected against thermal and mechanical damage. By the rigid one

Arrangement of the water lance blower, the loads of the water supply system are significantly reduced. By the

smaller diameter of the Durchblaszylinders 2 and its rigid attachment in the ball segment 4, it is possible to achieve greater tilt angle of the water lance blower especially for small hatch dimensions. The blowpipe can be made shorter and more streamlined by the long de-twisting device 18. Dirt at the exit of the

Durchblaszylinders 2 are prevented or eliminated by the exiting water jet, contamination at the outlet of the Nozzle generally excluded. If the water lance blower is not in operation, air flows through the slots or bores 5 or spacer rods 15, the one

brings additional cooling effect and prevents contamination from the boiler side.

By the ball segment 4 of the invention, the water lance blower easily in all required directions

be pivoted. The wedges 9 are quickly solvable and thus the cover plate 7, whereby the water lance blower can be replaced very easily and quickly and without decommissioning of the boiler. The attachment by means of

Wedges 9 is also less sensitive to temperature. The grooves 10 and 11 reduce the thermal load. Reach Dirt particles between the sliding surfaces, so they are when pivoting the water lance blower at the edges of the Grooves 10 and 11 stripped off and discharged over the free opening of the groove 11. This results in a self-cleaning effect

between the sliding surfaces, and it is a high operability and durability with complete sealing of the

Durchblaszylinders 2 achieved. Due to the twice as thick training of the ball segment 4, the self-cleaning effect is enhanced and recorded Heat dissipated better.

Claims (2)

1. Water lance blower for cleaning heat exchangers, in particular a Brennkammerheizfläche in steam generators, which is attached to a pivotable roller guide and pivotally mounted by means of a ball joint in a hatch of the combustion chamber wall, characterized in that the front of the tuyere (Your Durchblaszylinder (2) rigidly flanged and the mouth (3) of the tuyere (1) is inserted into the blow-through cylinder (2), the blow-through cylinder (2) is rigidly fixed in the ball joint formed by a ball segment (4) and slotted in its free part or provided with bores (5) , 2. water lance blower according to claim 1, characterized in that the Durchblaszylinder (2) of a plurality of the spherical segment (4) and the flange (12) of the tuyere (1) connecting spacer rods (13) is formed.