SU901775A1 - Unit for drying granulated black carbon - Google Patents

Description

(C) INSTALLATION FOR DRYING GRANULATED SAYAN

The invention relates to a device for drying bulk materials and can be used to dry granular carbon black in the production of carbon black. A soot pelletizing drum is known, comprising a housing with end caps, a loading device, an internal surface cleaning device, a drive and a discharge device made attached to a Topt4OBc i cylinder drum cover from a grid located above the hopper for classifying LI granules. The known drum permits the grading of the granules, but is unsuitable for drying wet granulated carbon black. In addition, the discharge device in the form of a cylinder from a grid is unsuitable for sieving granules after drying wet soot in a tumble dryer because of condensation of moisture from large granules and soot lumps when the latter are in contact with the cold surface of the grid cylinder and sticking cells of the grid with soot. Closest to the present invention is a plant for drying granulated soot containing a rotating dryer drum with end loading and unloading lids, nozzles of the drying agent inlet and outlet and granules connected to the corresponding lids 2. The disadvantages of this installation are the absence of classification of soot granules and its low production /: output for a commercial product. An important condition for determining the hydrodynamics in a tumble dryer is the particle size distribution of soot, m e, fractional composition The size of the pranulum is extremely negative. When the granule is dried in a drum, a wide range of particle size distribution of Hav can be observed. The uneven residual of 3901 moisture in the sizes of granules leads to a very wide range of moisture content in the BiiinycKy product. Granular has a very wide range. The capacity of the granules increases with an increase in their size. When drying granules; soot in a drying drum to a moisture content of 0.5 (according to GOST requirements) Sewing small granules, both less moisture-intensive, destroying them into dust, which is carried away with the used heat sink, and then returns to re-granulation, which reduces the productivity of the plant by means of carbon black, and the iHvM-iH with reduced moisture IMO - EG m /, Zkuo strength. When loading and unloading such soot from car hoppers and during transportation, soot granules are less durable and the dust is destroyed, impairing the transportable properties of the finished product. Besides. the presence of large granules, usually of irregular shape, and lumps itself (and also reduces the transportable properties of the finished product when transporting it, in transport estimates, consumers, clogging transitional heat, worsens the condition of unloading hopper cars, depending on the discharging bins, just hopper cars under unloading. The purpose of the invention is to increase the productivity of the productivity and ensure the passification of the pellets. The goal is achieved by the fact that inside the drum in the area of the end unloading cover A mesh is cylindrical or multifaceted inset, fitted at both ends with loading and unloading buckets, the outlet of the drying agent is inserted inside the insert along the axis of the drum and has a curved inlet end with an open cut directed upwards .. dryer, drum 1 with end loading and unloading lids 2 and 3 with nozzle k, nozzle 5 for introducing wet soot granules, nozzle 6 for bringing out dried grams, nozzle 7 to inject the agent (carrier heat), pipe 8 to output 54 coolant and vaporized evaporated moisture together with clumps of soot and dust from the drum, diaphragm 9t with buckets 10, 11 and 12, mesh ciliydric or polyhedral insert 13 located in the zone of the discharge cover 3s and heating chamber 14. The nozzle 8 is inserted into the insert 13 and has a curved inlet end, the open cut 15 of which is directed upward. Buckets 10 and 11 are placed on both sides of the insert 13 "The installation works as follows. The wet granulated carbon black through the nozzle 5 enters the drying drum 1 on the nozzle k. Drying of the wet soot granules is carried out by a contact method by transferring heat through the wall of the drum 1 from the heat carrier circulating in the heating chamber 1. To create a directional movement and remove vapor of the evaporated alagi from soot granules, part of the coolant is fed into the drum through pipe 7. Dried granulated soot with buckets 10 is fed into the mesh insert 13. The soot-sized granules are drawn through the insert 13 and large clumps of soot buckets 11 are fed into the pipe 8 and are removed along with the drink, the spent coolant and released during the drying with vapor. The speed of exhaust gases and moisture vapor in the mesh insert 13 is 0.5-0.8 m / s, which eliminates the product quality carryover, since this speed is much less than the soaring speed of small granules and the gas velocity in the socket 8 is 30 50 m / s, which is significantly higher than the soaring speed of coarse granules and soot lumps that are carried away with gases. sticking mesh inserts Conditioning to size Sash granules to ladles 12 are fed through a discharge nozzle 6 for unloading from a drum. The advantage of the proposed installation of Kt is that the resulting granulated carbon black has great strength due to the absence of overdried small granules, a more uniform particle size distribution

granules, due to sifting of large granules, lumps of soot and dust, which allows to improve the quality of the finished product and improve its transportable properties,

This is achieved by the fact that in such an installation it is not necessary to dry large granules and lumps of soot to a moisture content of 0.5 in accordance with existing requirements, since when they are dried to the required moisture, the drying of small granules as less moisture-consuming occurs. The dried grains lose their strength. and are disintegrated into dust, which is carried away with the exhaust gas, and then fed to re-granulation, which reduces the capacity of the plant.

In the proposed installation, the drying of soot to a moisture content of 0.5 is carried out only for conditioned granules (size of soot at the outlet of the drum, C

Temperature of heat carrier in the heating chamber, С

The strength of the granules, kg

The amount of soot carried away with exhaust coolant and moisture vapor,%;

Soot particle size distribution: more than 3.0 mm

less than 0.1 mm

rum up to 2.0 mm) that passes through the openings of the mesh insert, and large granules and soot lumps that remain on the insert and contain moisture enter the off-spec product. In addition, when soot is dumped from the buckets onto the mesh insert, it blows the granules with the spent heat carrier. In this case, dust is separated (less than 0.1 mm in size), which is carried away with the spent heat carrier to substandard product. The process of drying the granules of the conditioned fraction can be adjusted by displacing the mesh insert along the length of the drum. This allows the dried granules to be selected in the required sizes.

Technological parameters and qualitative indications of granules are given in the table.

160

850 11.8

2 60

25 6

Claims (2)

5 2 In order not to overdry small and conforming granules (depending on the fractional composition of the granulate), large substandard granules are removed with the help of a mesh insert, not dried up to the requirements (0.5 for reprocessing, as granules of more than 2 mm in size must be removed from the finished product. For this purpose, the mesh insert and the outlet pipe for large granules with a drying agent can be installed anywhere on the drum axis at a distance of 0.03-9.3 times the length of the barkan from the discharge end cap of the drum. Do not allow excess heat for drying, as well as reduce the volume of gases sucked out of the drum and are usually cleaned in a bag filter Formula V. The installation for drying granulated carbon black, containing drying L 90 / / /, / 58 drum with end loading - and unloading lids and nozzles of the input and output of the drying agent and granules, characterized in that, in order to increase productivity and ensure the classification of granules, a cylindrical or multifaceted mesh is installed inside the drum in the area of the end unloading cover A rake equipped at both ends with loading and unloading buckets, 2 o Installation according to claim 1, about t and h so that the nozzle of the drying agent is inserted inside the insert along the axis of the drum and has a bent inlet end, the open cut of which directed upwards. Sources of information taken into account during the examination 1. USSR author's certificate No. 176570, cl. B 01 I 2/12, E66, 2. USSR author's certificate No., class, F 26 O 11/0, 1977. 13 11 ff