Turning pleaseprovide boiler

 

(57) Abstract:

Use in steam boilers on mnogosolnca fuel, as well as other industries in the device for the transportation and separation of materials in pulverulent condition. The essence of the invention: on the curved inner surface of the cochlea mounted transverse ribs up to 2% of the lateral dimension of the input pipe, but not less than 4 mm, when the distance between the ribs 1.5 - 2 times greater than a height of the ribs placed within the sector, for which the angle between the axis of the inlet pipe and the normal to the curved surface is from 20 to 70o. 1 Il.

The invention relates to a power system and can be used in steam boilers on mnogosolnca fuel, as well as other industries in the device for the transportation and separation of abrasive materials pulverized.

The known device with snail entrance dusty stream from a steam boiler, for example, snail battery cyclones [1] the Use of these devices reduces the speed of the gas-and-abrasive wear of smoke exhausters and other equipment.

A disadvantage of the known devices of this type is an intense symptom the x particles, the lower part of the descending flue which is executed in the form of snails right and left rotation with a gap in the curved surface of snails, forming a ledge, outdoor dust in the camera, and the output duct attached endwise to each of the cochlea and to the dust chamber inlet, the entrance to which is located under the dust cover of the camera between the two ledges [2]

Selected for the prototype swivel Luggage boiler flue and other output devices boilers can reduce the speed of ash wear by aligning and reducing the concentration of fly zone in the flue downstream, the alignment of the gas velocity over the cross section of the flue.

The disadvantage of these devices is abnormal wear on the inner surface of the input snails.

Proposed rotary pleaseprovide boiler containing the input snail and output cylindrical pipes. On the curved inner surface of the cochlea mounted transverse ribs up to 2% of the lateral dimension of the input pipe, but not less than 4 mm, when the distance between the ribs 1.5-2 times greater heights, and ribs disposed within the sector, for which the angle between the axis of the inlet pipe and the normal to a curve on the supply intensity abrasive wear (life extension) of the input snail fin tube is curved inner surface of the cochlea. Transverse ribs are installed within the sector, for which the angle between the axis of the inlet pipe and the normal to the curved surface is from 20 to 70about. The surface of the fins is selected based on the nature of local wear snails rotary gas pipelines. It is also known that the maximum wear low-carbon steels is observed at angles of attack of abrasive flow 30-60about. Tests conducted on existing equipment, confirm the need to limit the specified sector fins curved inner surface of the cochlea.

The first edge is made with unstressed fluid entrance-side flow. The height and pitch of the ribs is determined on the basis of considerations for creating effective protection of curved surfaces from wear by reducing the surface reflection for large particles, the generation of the intercostal canal system of vortices while maintaining the hydraulic resistance at the same level.

Dimensions rotary pleaseprovide boilers of various production vary from 0.2 to 5 m Installation ribs should not increase the hydraulic resistance of the flue, cluttering section for free passage dusty is, equal to the distance along the normal between those walls pleaseprovide in the section before the turn, which then move in a curved surface input snail pipe.

The minimum height of the ribs should be at least 4 mm for generating vortices of scale on the order of two more scale vortices generated by the raw concave surface. The step edges of the conditions of intense vortex in the intercostal space and the minimum resistance setting should be a half to two times the height of the ribs. It is advisable to perform ribs inclined offset upper (remote output) side of the ribs down to the stream.

The drawing shows schematically the proposed installation of the wear of edges in a rotary gas boiler.

Rotary gas contains input snail pipe 1, followed by snail 2 axial weekends cylindrical pipe 3. Within the shaded Central sector 4 on the input concave surface snails mounted transverse ribs 5 the height h of not less than 4 mm, when the distance between the ribs (1,5-2)h. First along the strip edge 6 is made with unstressed smooth entrance usbecause stream.

Vnesti snails 2 performed after finned surface gap (the ledge) 7, discoveries in the dust chamber 8. To reduce the hydraulic resistance of the rotary pleaseprovide on the opening of the discharge pipe can be installed a device that converts rotational movement of the stream after snails, restoring static pressure.

The hydraulic resistance of finned snail rotary pleaseprovide with different dimensions and the gas flow does not exceed the hydraulic resistance of the smooth rotate 90about("tribe"). The angle of the ribs to the generatrix of the curved surface can vary from 0about(for a simple transverse ribs) 30aboutdeviation in the direction of gas flow to the end of the ribs remote from the output of a cylindrical pipe.

Dusty dust and gas flows from the boiler to the rotary pipeline input snail nozzle 1.

With the passage of flue gases through the inlet snail finned tube under the influence of inertial forces is a selection of the coarse fraction abrazivcompany ash in the peripheral region of the cochlea 2, then the ash is discharged through the slit 7 in the dust chamber (bunker) 8. Under the influence of rarefaction for turning gas boiler gases gradually the expulsion of the eye in the socket of the ash particles are rejected to the external finned wall. Large-scale vortices that occur near the concave surface, crushed ribs into smaller vortex formation, the scale of which is proportional to cell size between the ribs. In the absence of large-scale turbulent transport of suspended in the flow of the particles in its mass cannot reach the wall of the swivel duct. The speed of those particles that hit the wall of the flue, is markedly reduced in the presence of the ribs due to the deceleration of the flow, education aerodynamically shady areas and stagnant currents of small magnitude in the intercostal space.

The rate of wear metals is proportional to impact velocity of the abrasive on the surface to the extent of 2-3, therefore, proposed a simple aerodynamic braking unit flow at the wearing surface turned out to be efficient and profitable.

Health check beading proposed for protection against abrasive wear of the surfaces of the input snail pipe swivel gas boiler, was carried out under production conditions on snail zakruchivali cyclone with a diameter of 512 mm battery ash boiler TPE-208 Smolenskaya GRES. Protection of snail secretively cyclones finning issue>The result of the experiment revealed that the finned snail surfaces (blades) cyclone shell thickness S 5 mm at follow-14200 h remained intact. Snail surfaces (blades) without fins thickness S 8 mm wear to the through holes for 6000 h in the same conditions and require replacement.

Material of blades Article.3.

In laboratory conditions on the stand was mounted swivel camera boiler flue performed in [2] the Concentration of ash behind the camera after her beading has not changed.

On the stand was tested cyclone element diameter 512 with ribbed internal surfaces snails swirl (blades) of the dust-Laden stream.

The effectiveness of the cleaning gas in such a cyclone is virtually unchanged, but reduces its hydraulic resistance.

The use of a rotary flue boiler with ribbed surface input snail pipe will not only protect the equipment of the boiler from wear coarse abrasive ash, but also to increase the service life of the proposed device and to improve its technical characteristics.

TURNING PLEASEPROVIDE BOILER containing the input snail and output cylindricity to 2% cross-connection size inlet snail pipe, equal to the distance along the normal between the walls of pleaseprovide, turning into a curved surface input snail pipe, but not less than 4 mm when the distance between the ribs, 1.5 to 2 times greater heights, and ribs disposed within the sector with an angle between the axis of the inlet pipe and the normal to the curved surface equal to 20 70o.

 

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