SU1693006A1 - Method of cleaning carbon black - Google Patents

Abstract

The invention relates to the technology of cleaning soot from mechanical impurities and allows to increase the degree of purification and reduce soot waste. The carbon-gas stream comes from the trap apparatus first to the first inertial separator, from which 70-85% of the original stream, in purified form, from 1500 microns inclusions, enters the cyclone to separate the main soot mass, and the remaining soot to the second inertial separator to separate the remaining amount impurities, purified in this separator. The gas and gas stream is returned to the first separator. The degree of purification of soot is 0.05 (the mass of the residue after sifting through a sieve with a mesh is 0045 K), the amount of soot waste is 1.0 kg / h. 1 ill., 1 tab.

Description

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The invention relates to the technology of purification of soot from mechanical impurities and may find application in the production of carbon black.

The aim of the invention is to increase the degree of purification of soot and reduce its waste.

The drawing shows a diagram of the process of cleaning soot.

The soot trapping device 1 (cyclone, bag filter, electrostatic precipitator) is connected to the gas transport pipeline with an inlet 2 of the first (main) inertial separator (IC) 3. The latter has an outlet 4 of the soot flow and a discharge pipe 5, which is connected to the inlet 6 of the second (optional) and C 7. To unload the waste, the IC 7 is equipped with a lock feeder 8 and has

an outlet 9 connected by pipeline to a fan 10.

The outlet of the first IC 3 by a gas transmission pipeline is connected with a gas transportation fan 11 and a cyclone-12, designed to separate soot from the soot-gas flow (SGP) and feed it to the granulation apparatus. Cyclone 12 is connected to the gas collection apparatus 1 by returning the gas transportation pipeline to supply the cleaned gases to the apparatus 1. The gas transportation return pipeline can be connected to the inlet manifold 6 of the second IC with a separate pipeline (dashed line), in which the discharge of the main separator is provided with a lock feeder.

Example 1. A carbon dioxide mixture of 8,000 m3 / h, containing 500 kg / h of soot and 10 kg of impurities from the separation of

no soot is fed to the trapping apparatus 1, where the soot is released from the EGR. The cleaned gases are removed from the trapping apparatus, and a part of the carbon black gas mixture in the amount of 5000 m3 / h, containing 5000 kg / h of soot with impurities in the amount of 10 kg / h, comes from the soot trap apparatus 1 and further to the inlet 2 first is. In the same pipeline, fan 10 serves 2000 m / h of a carbon black mixture containing 2 m / h of impurities after processing it in the second IS 6. In the first IC 3, when particles change direction, completely foreign particles of more than 500 microns and 98% of particles are deposited more than 140 mm. CGL in the amount of 5000 m3 / h (71.4%), cleaned of impurities, is fed through pipe A of the first IC with a fan (t of a gas engine) 11 into the cyclone 12 of the gas transport, where the main mass of soot is released, which is sluice on granulation. The gases cleared of the main mass of soot are returned to the soot trap unit 1 via the gas pipeline return pipeline. From the first IS 3, the rest of the CGS in the amount of 2000 m2 / h (28.6%) together with settled impurities (100 kg / h of soot, 72 kg / h of impurities) with a dispersion of 1500 µm through pipe 5 are fed to the inlet pipe b of the second IC 7, in which the separation of impurities from soot. Impurities in the amount of 9.9 kg / h with soot content of 1 kg / h are removed from the second IC 7 with a sluice gate 8, and the carbon black mixture containing 2 kg / h of impurities, the fan 10 is directed to the first IC 3. Degree of purification Soot mass fraction of the residue after sifting through a 0045K sieve is up to 5.

The table shows the performance of the process of cleaning soot according to the invention in comparison with the known method.

The number of CGF supplied to the first IC from the capture point, m / h 5000

The number of CGS entering the first IC from the second IS, m5 / h2000

The number of CGF entering the first IS, m / h 7000

0

five

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Due to the lower hydraulic resistance of the first IC, the flow rate in it according to the invention is higher and, accordingly, the cleaning of the CST from particles of 500 µm is more efficient. All particles with inclusions of 1500 µm are separated in the additional IC. The required optimum speed range in the separators is ensured by the separation of the flow into two parts in the first and second separators.

When the CGS flow rate in the second IC is less than 15%, the amount of waste soot along with impurities increases. At a flow rate of CGP of more than 30%, in this case there is a minimum soot content in the waste, however, the plant capacity decreases and the content of impurities in soot increases due to its entrainment along with the flow having a speed higher than the soar speed of impurity particles

Thus, the invention increases the degree of soot purification and reduces the amount of soot waste,

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A method for purifying soot from mechanical impurities, comprising treating a soot gas flow in a first inertial separator with a main outlet the purified stream, the supply of the separated solids and the residue of the soot-gas stream to the second inertial separator for additional treatment, the removal of the cleaned black-out stream from it and the release of solid impurities, in order to increase the degree of purification and reduce soot waste, 1530% of the soot-gas flow coming out of the first separator is treated in the second inertial separator, and the purified soot-gas flow from the second separator is returned to the first comparator. 5000 250 7000 CGF released from the upper nozzle k of the first IC and entering the cyclone: Dispersibility, micron CGS allocated from the bottom of the first IC: Soot amount, kg / h The amount of impurities, kg / h The dispersion of impurities, microns The number of CGS emitted from the upper nozzle of the second IC 4, which enters the first (upper) IC, The amount of impurities removed from the bottom of the second IC, kg / h Soot waste quantity, kg / h Mass dale residue after sifting through a sieve with a mesh 0045K (degree of purification, and soot) Table continuation  - .... - -...: - - - - - - B I 750 95.0 with particles 500 1.0 2.0 0.15 / . 7 Oh