The device for separating the granular material from the carrier gas

 

(57) Abstract:

The invention is intended for pneumatic transport of bulk materials. The device for separating the granular material from the carrier gas includes a hopper with a discharge Assembly of the bulk material, a host of additional separation of the bulk material, connected to the internal cavity of the hopper through the bottom end, the input and output pipes, cyclone and filter. Pre-separation of the granular material from the carrier gas in the form of a cyclone that is installed on the tank cover and coaxially communicated with the cavity of the hopper pipe output material with respect to which coaxial cylindrical shells forming two vortex chamber, closed at the top and open at the bottom, in the cavity of the hopper, having a tangential inlet and outlet nozzles. The cyclone is connected through automatic dust shutter with receiving bin. The device may contain a second cyclone has an individual container. The output of a cylindrical pipe automatic dust shutter and a coaxial cylindrical shells in the lower part provided with the conical bactrobanonline spring-loaded vanes. The use of the invention allows to increase the reliability and efficiency of the device for separating the granular material from the carrier gas in pneumatic installations. 3 C.p. f-crystals, 4 Il.

The invention relates to pneumatic transportation of bulk materials and can be used in chemical, construction and other industries associated with the processing of powder materials.

Famous cyclone installation (Ed. St. USSR 1087182, M CL 04 With 5/103, 04 7/00, publ. 23.04.84), consisting of a hopper-box, coaxially located primary and secondary cyclones, comprising a housing with a bottom inlet of the discharge channels and exhaust pipes. The primary cyclone is equipped with dividers dust and gas flow established between the bottom and the exhaust pipe. Exhaust pipe additional cyclone placed inside the exhaust pipe of the primary cyclone. The divider is made in the form of a hollow truncated cone, set up a large base.

In this installation the primary cyclone is the hub of the solid phase, and separating the particles from the carrier stream is provided by the optional cyclone having bonsaitalk to work in aspirazione systems with solids concentration, less 0,002 kg/m3. Use cyclone installed in the device the piston of the pneumatic transportation with solids concentration equal to 100-170 kg/m3will lead to a rapid clogging of cyclone installed in the place of transition of a material from the primary to the secondary cyclone and emergency stop of process of transportation of bulk material.

Famous cyclone (Ed. St. USSR 538743, M CL D 04 5/103, publ. 15.12.76), comprising a housing with a tangential inlet nozzle, sand drain pipe, coaxially mounted inside a large base upward conical element, equipped with blades, in which the conical element and the drain pipe is installed with the possibility of axial movement relative to each other and the housing. The cyclone body made in the form of truncated cones facing each other in large grounds, and in the lower part of the conical element is set to the tube flared.

The lack of a cyclone is a low efficiency of gas purification in internal conical element. The reason is the suction gas in the gap between the inner conical element and the tube is flared, as at this point there is no shutter, allowing the OS is. ) that leak a small amount of gas in separately element from the side of the hopper (5%) can virtually eliminate the possibility of trapping fine particles.

The closest functional and technical nature of the proposed device is a filter precipitator for installations of pneumatic transport of bulk materials (Ed. St. USSR 1331766, M CL D 65 G 53/60, 01 D 46/02, publ. 23.08.87, BI 31) containing a mounted on. the upper wall is in communication with the pneumatic transport pipe hopper frame, spring-loaded vertically and secured to it and on the top wall of the hopper vertical tubular filter elements are made with top and side end surface of the breathable material and communicated through the bottom end with the cavity of the hopper, which is provided with an additional bag filter element made with the upper end surface of the airtight material and located asymmetrically to the rest of the frame is positioned on the top wall of the hopper by means of a hinge. Filter precipitator is supplied mounted on the frame with the possibility to move in the radial relative to the axis of the hinge direction contiguously and Else the angle of the taper of the socket.

The lack of filter precipitator is unreliability work with fine powdery material (<40 μm) due to driving long filter cloth, because the gas with suspended fine particles is fed to the filter. This leads to instability of the hydrodynamic mode installation integrity of the filter surface and the instability of the whole plant of pneumatic transport. The use of filtering material with large pore size greatly reduces the performance indicator for gas purification and leads to loss of saleable product.

The problem to which the invention is directed, is to create a device, which can eliminate the above mentioned shortcomings, to improve the reliability and efficiency of the dedusting system in pneumatic installations with high specific load of fine material.

The problem is solved in that the device for separating the granular material from the carrier gas, comprising a hopper with a discharge Assembly of the bulk material and the filter fitted is placed between the hopper and the filter node additional branch of the granular material from the gas made in the form of qi is what material, on which is coaxially placed two cylindrical shell with the formation of the external reception of the vortex chamber with a tangential entry of the original mixture and the internal chamber of the gas from the hopper reported pipe with the inlet of the cyclone, the cyclone is equipped with a dust shutter in its lower part. Site additional branch of the granular material from the gas may contain a second cyclone with individual hopper, associated respectively with the first cyclone and filter. The pipe issuance of the bulk material of the cyclone and cylindrical shells in the lower part provided with a tapered socket set can move in the vertical direction. In the input pipe of the cyclone installed spring-loaded guide vane.

In the drawings shows a device for separating the granular material from the carrier gas. In Fig.1 shows a General view of the device.; in Fig.2 - section a-a of Fig 1; Fig.3 - section b-b of Fig.1; Fig.4 - section C-C in Fig.1.

The device for separating the granular material from the carrier gas consists of a receiving hopper 1 to discharge bulk material 2. In the upper part of the hopper 1 has a host of additional trubka output of bulk material 5. Relative to the pipe 5 coaxial cylindrical shells 6, 7. The cyclone is equipped with an automatic dust shutter 8 is mounted coaxially to the nozzle 5. Pipe output of bulk material 5 automatic dust bolt 8 passes through the center of the cylindrical shell 7 and the open end enters into the internal cavity of the hopper 1. This enables simple, reliable and compact to solve the problem of installation, to ensure the quality of cleaning and automatic unloading of powder. Cylindrical shells 6, 7 and the cylindrical pipe 5 form two vortex privateers, open into the cavity of the hopper 1. To the outer cylinder 6 Tangenziale attached inlet pipe 9 (see Fig.3). To the bottom of the cylindrical shell 7 and the pipe output of bulk material 5 is attached to be movable in the vertical direction conical sockets 10, 11. Tapered socket 12 is stationary. The outlet 13 of the cyclone 4 is connected to the inlet side 18 of the cyclone 14, having individual hopper 15. At the outlet from the cyclone 14 for the cleaning of the gas filter is installed 16. In the input branch pipes 17, 18 cyclones 4, 14 are spring-loaded 20 guide vanes 19 for automatic regularorily.

The device for separating the granular material from the carrier gas works as follows.

The powdered material together with transporting gas through pipe 9 enters the cavity between the cylindrical shells 6, 7. When the tangential input of the mixture of the material under the action of centrifugal force separates the external surface of the shell 7 and then rotating highly concentrated clot enters the hopper 1 and is deposited in the lower part. When the material falls on the conical sockets 11, 12 and thrown to the wall of the hopper 1. Transporting gas from the hopper 1 is removed through an adjustable gap between the conical sockets 10, 11. Due to the sharp turn of the flow and the centrifugal force acting on the particles at the entrance to the gap between the conical sockets, separates the particles from the carrier gas. As the powder-gas stream at the entrance to the adjustable gap between the conical sockets 10, 11 saves rotational movement, while moving towards the center of rotation in the space between the conical sockets circumferential component of the flow velocity increases (by law, potential flow), therefore, increases and price is the outer coat of the shell 7 and the socket 11, moreover, the conical shape of the socket 11 helps to remove particles in the hopper 1 and discards them from the place of conclusion of dust and gas flow from the hopper. Adjusting the twist of dust and gas flow and the change in the structure of the distribution component of the velocity vector of flow by varying the size of the gap between the conical sockets 10, 11, 12. The purpose of the regulation is the establishment of optimal allocation component of the velocity vector of the carrier medium and the achievement of maximum efficiency of gas purification in the additional node separation pre-treatment 3. Performing site additional purification 3 in the form of coaxial cylindrical shells 6, 7, closed at the top, close to the optimum, as a small hydraulic resistance of the device it makes it possible to relieve the flow from the main mass of granular material and greatly facilitate the task of further gas purification.

From the vortex chamber, a powder-gas flow through the pipe 17 enters the cyclone 4, where nessel gas flow are separated fine particles. The material captured by the cyclone 4, enters the automatic dust shutter 8 and after a certain period of time is removed Ditmar bunk in the gas flow through the cyclones varies from a maximum, the corresponding mode purging of the pipeline to a minimum, corresponding to the time of arrival of the piston in the pre-treatment device 3. As the velocity of the gas at the inlet to the cyclone is non-stationary value, this negatively affects the efficiency of separation of particles.

To compensate for this phenomenon in the inlet to the cyclone installed spring-loaded vanes 19, which in the case of a fall of gas flow under the action of springs 20 are deflected toward the center of the pipe (the force of the flow on the blade is reduced), the overlap part of the bore of the socket and retain necessary to effectively clean the dust and gas flow rate at the entrance to the conical part of the cyclone 4, 14. Install spring-loaded vanes 19 in the inlet to the cyclone allows a few percent to increase the efficiency of cleaning gas during operation of the pneumatic pulse "piston" mode with non-stationary gas flow. After cyclone 14 for the final cleaning gas enters the filter 16. Installation of the cyclone 14 individual hopper 15 is caused by the need to protect the filter 16 from emissions of powder in the case negritoska) or due to other factors. The cyclone 14 with individual containers 15 serves to control the operation of the dedusting system mounted over the receiving bin, allows you to exclude emergency situations in the operation of the installation (the clogging of pores and impulse filter material), to determine the timing of scheduled maintenance with automatic dust shutter 8.

Thus, the combination of all elements and their interaction allows to solve the problem is to increase the reliability and effectiveness of the device for separating the granular material from the carrier gas.

Specific example

Device for separating powder from the carrier gas was manufactured at the Siberian chemical combine and mounted on a receiving hopper installation pressure "piston" transport of uranium oxides.

Geometrical and operational parameters of the installation, the following.

The mass-average particle diameter, µm - 30

The gas flow rate, m3per hour (transport, air purge) - 70, 200

The pipe diameter, mm - 50

The diameters of cylindrical chambers, mm - 210, 700

The diameter cyclones, mm - 167

The diameter of the cylindrical pipe dust shutter, mm - 100

The size of the outlet dust, satwa the

As shown by the test results, the device for separating the powder from the carrier gas has exceptional reliability and high efficiency separation of powdery material from the carrier gas. During the two-year operation was not a single case of system failures. Application of the proposed device instead of batteries metal-ceramic filters significantly reduce specific cleanup costs, simplify maintenance and repair, to stabilize the operation of the complex gas treatment equipment. Thanks to the application installation overshoot factor of particles of the powdered material was reduced to 40 times compared to the base object that was previously used by the centrifugal cyclone separator (Ed. St. USSR 373017, M CL 01 D 45/12), with the indicator of the efficiency of gas purification and 99.8%. The efficiency of purification of process gases from the powder material in the installation of pneumatic transport of uranium oxides is 99,995%.

1. The device for separating the granular material from the carrier gas for pneumatic installations, comprising a hopper with a discharge Assembly of the bulk material and the filter, characterized in that it is made in the form of a cyclone, installed on the upper part of the hopper, and coaxially communicated with the cavity of the hopper pipe the output of the bulk material, on which is coaxially placed two cylindrical shell with the formation of the external reception of the vortex chamber with a tangential entry of the original mixture and the internal chamber of the gas from the hopper reported pipe with the inlet of the cyclone, the cyclone is equipped with a dust shutter in its bottom part.

2. The device under item 1, characterized in that the node has an additional branch of the granular material from the gas includes a second cyclone with individual hopper, associated respectively with the first cyclone and filter.

3. The device under item 1, characterized in that the connection of the output of the bulk material of the cyclone and cylindrical shells in the lower part provided with a tapered socket set can move in the vertical direction.

4. The device under item 1 or 2, characterized in that in the inlet pipe of the cyclone installed spring-loaded guide vane.

 

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