Apparatus for pneumatic conveyance of powdered medium from ash catcher bins

FIELD: pneumatic conveyance system used, in particular, for removal of ash from heat-electric generating stations.

SUBSTANCE: apparatus has electric valve connected with its winding to pulse generator, and powdered medium flow forming device. The latter includes upright casing with valve having seat, two axially aligned air supply pipes and powdered medium discharge branch pipe, which are disposed in lower end of upright casing. First air supply pipe is introduced through upper end of casing into its cavity above valve, and outlet end of second pipe is introduced into cavity under valve, which is mounted for displacement in vertical plane between outlet ends of first and second pipes. Inlet end of first pipe is connected through upper cavity of unit defined by piston and through receiver with excessive air pressure source, and inlet end of second pipe is communicating through aperture of upright casing of said unit, said aperture being closed with piston, through lower cavity of upright casing of this unit and electric valve to excessive air pressure source. Upper part of inclined portion of apparatus is connected through powdered medium discharge branch pipe to cavity above valve of flow forming device and lower part is connected with conveyance pipeline.

EFFECT: increased distance of conveying materials.

1 dwg

 

The invention relates to the field of power engineering and can be used in thermal power plants for the removal of ash from hoppers of ash collectors.

The prior art.

A device for the pneumatic conveying powder from a hopper containing the intermediate tank, the site of fluidization, valves, level gauge, transport pipeline [1].

The disadvantage of this device is the low reliability, due to the limited service life of valves, operating in abrasive environment.

The closest in technical essence to the present invention is a device for the pneumatic conveying of powdered environment from the storage silos ash catchers, containing sectional tubing with angled and ascending sections in each partition, the node housing with a piston rod which is rigidly connected with a sloped section of the pipeline, the source of positive air pressure, coupled with the lower cavity of the body [2].

The disadvantage of this device is the design complexity when implementing the objectives of the pneumatic transport over long distances (100 m and more).

The task of this company is expanding functionality by providing a pneumatic transport over long distances.

The subject of the invention is a device for the pneumatic transport of the powdery medium from the storage silos ash catchers, contains a source of positive air pressure, a sloping site, a site that is made in the form of a vertical housing with a piston, the lower cavity which is communicated with a source of positive air pressure, in which is inserted a valve, is connected with its winding to the pulse generator, the shaper of flow of powdered medium, made in the form of a vertical casing, the bottom of which is placed a valve seat, two coaxial tubes that deliver air and pipe outlet powdered environment, while the first tube is inserted through the upper end of the body in its cavity above the valve, the output end of the second tube is introduced into the cavity under the valve, which is installed with possibility of vertical displacement between the output ends of the first and second tubes under the action of air from a source of excess pressure through the second tube, and the flow of powdered environment, the input end of the first tube is connected through the upper cavity of the mentioned site, bounded by a piston, and a receiver with a source of positive air pressure, and the input end of the second tube communicated through hole vertical case mentioned site blocked by the piston, the lower cavity of the vertical body of this node and said solenoid to a source of positive air pressure, while the upper part of the NAC the local site is connected through the pipe outlet powdery medium with a cavity above the valve driver thread and the lower part, with the transport pipeline.

Device for pneumatic conveying of powdered environment depicted in the drawing.

The device includes a shaper of flow executed in the form of a vertical casing 1, the lower end of which is placed the valve 2 seat 3, two coaxial tubes 4, 5 supply air and the exhaust pipe 6 powdered medium provided with a sloped section 7, the node is executed in the form of a vertical casing 8 with the piston 9, the lower cavity which is communicated with a source of positive air pressure (not shown). The input end of the tube 4 is connected through the upper cavity of the site, bounded by the piston 9, the receiver 10 with a source of pressure, and the input end of the tube 5 is communicated through the Central cavity of the node is blocked by the piston 9, the lower cavity of the node with the solenoid 11, the winding of which is connected to the pulse generator 12. The output end of the inclined section 7 communicated with the transport pipe 13.

The operation of the device is accomplished in the following way. Submission pulse of air into the tube 5, and the pressure of the flow of powdered medium in the lower cavity of the hopper causes the opening of valve 2 and the flow of powdered medium in an inclined section 7. After a definite time interval, defined by the average time to fill the cavity slope 7 comes whitefish is al in the closure of the electrovalve 11 (from generator 12). Pneumosinus design pressure and volume corresponding to the volume of the cavity of the receiver 10 enters the upper chamber of the valve 2, providing closure and eviction powdered medium in the transport pipe 13. After removing pneumonolysis - opening valve 11, the valve 2 under the influence of the upward flow of air through the tube 5 and the pressure of the powder-like environment is opened and a new cycle begins filling powdered environment cavity slant section 7.

The solenoid 11 upon receipt of a control pulse from generator 12 provides a flow of compressed air into the cavity under the piston 9, which, rising, overlaps the two holes in the upper end of the body 8 and an opening in the middle of the cavity for connection with the tube 5. During this period, the air enters the lower cavity of the valve 2 through the tube 5 through the opening (lifting) and receipt of powdered medium in an inclined section 7. According to the results of the inclined section 7 should be placed under the dynamic angle of repose (˜60°), since in this case the filling of powdery environment cavity portion of the constriction at the entrance to the transport pipeline. For example, when the vertical placement of the inclined section 7 when the displacement powdered medium pulse without the ha at the site of narrowing, there is additional pressure loss, which increases the energy consumption of pneumatic transport.

Pulse displacement powdered environment is at the closed position of the solenoid 11, the piston 11 is lowered under the action of pressure of the air receiver 10, which for a few seconds (depending on the volume of the receiver) provides a pulse emission of air through the holes in the upper cavity of the housing 8 and the tube 4 in an inclined section 7 and piston displacement powdered medium in the transport pipeline.

According to experimental results, the coefficient of friction powdery environments is greatly reduced when the seal of its flow, i.e. the formation of the piston powdered environment with maximum density. This determines the need to minimize the admission of air to move powdered environment. When the pulse exposure to air (without fluidization) powdered medium is moved with a minimum of porosity (0.5 to 0.6) friction factor of 3 lower than when moving in vacuum pumps (porosity less than 0,98). For example, at a pressure of 0.5-0.6 kg/cm2in the upper part of the inclined section of the pneumatic powder-like environment, you can make up to ˜70 m with respect to the consumption of powdered environment to air flow ˜100, which is several times higher than their foreign counterparts.

Sources of information

1. USSR author's certificate No. 1239064, 65 G 53/40, 1998

2. RF patent №2209171, 65 G 53/16, 2002 - the prototype.

Device for pneumatic powder medium from the storage silos ash catchers, containing a source of positive air pressure, a sloping site, a site that is made in the form of a vertical housing with a piston, the lower cavity which is communicated with a source of positive air pressure, characterized in that it introduced an electrovalve connected with its winding to the pulse generator, the shaper of flow of powdered medium, made in the form of a vertical casing, the bottom of which is placed a valve seat, two coaxial tubes that deliver air and pipe outlet powdered environment, while the first tube is inserted through the upper end of the body in its cavity above the valve, the output end of the second tube is introduced into the cavity under the valve, which is installed with the possibility of vertical movement between the output ends of the first and second Tr is the side exposed to air, from a source of excess pressure through the second tube, and the flow of powdered environment, the input end of the first tube is connected through the upper cavity of the mentioned site, bounded by a piston, and a receiver with a source of positive air pressure, and the input end of the second tube communicated through hole vertical case mentioned site blocked by the piston, the lower cavity of the vertical body of this node and said solenoid to a source of positive air pressure, while the upper part of the inclined section connected via a pipe outlet powdery medium with a cavity above the valve driver thread and the lower part, with the transport pipeline.



 

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