Auxiliary polycondensation device for reducing discharge concentration of superfine particles during chemical production

Abstract

The operation of collecting oil furnace process carbon black by separating the carbon black from tail gas is finished by a bag filter. Although the bag filter is relatively high in filtering efficiency, a large quantity of superfine carbon black dust particles are discharged to the atmosphere along with the filtered tail gas to pollute air to a great extent. In order to improve the carbon black discharge quality and reduce the discharge concentration of waste gas solid particles, the invention provides a solution, namely a polycondensation device; the polycondensation device is a door-shaped channel through which carbon black flue gas enters the bag filter from a preheater, and comprises an ascending pipe, a descending pipe, a top channel, an air inlet and an air outlet; the carbon black flue gas helically moves forwards in the polycondensation device; carbon black particles with relatively large gravity are thrown to the walls of the pipes by a centrifugal force, move along the inner walls of the pipes and are collided and extruded with each other; the carbon black particles are expanded in volume under the action of a Van der Waals' force, and the superfine particles capable of passing the bag filter are greatly reduced, i.e., the filtering efficiency of the bag filter is improved and the discharge concentration of the superfine carbon black particles is greatly reduced.

Description

technical field [0001] The invention relates to a carbon black production process equipment, in particular to a process measure for controlling the discharge of ultrafine particles of carbon black waste gas. Background technique [0002] Oil furnace carbon black is currently the main method of producing carbon black. The temperature of the carbon black flue gas from the reaction furnace is very high. After cooling by heat exchange equipment such as air preheater and oil preheater, the carbon black flue gas enters the mining Harvesting link; carbon black harvesting is the separation of carbon black and tail gas, and this work is done by bag filter. The bag filter is a bagged filter cloth filter device made of fabric fibers. When the carbon black smoke passes through it, the bag filter can prevent most of the carbon black particles and dust from passing through, and has a high filtration efficiency. That is, the recovery rate can reach 99%, even up to 99.9%. However, due to ...

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Problems solved by technology

However, due to the potential of the bag filter itself, there are still a large number of carbon black ultrafine particles passing through the bag filter along with the exhaust gas, and entering the combustion furnace with the exhaust gas to "burn" to generate electricity; according to analysis, although carbon black itself is theoretically possible Combustion, but because the combustion speed is very slow, the residence time in the tail gas combustion furnace is too short, basically it is discharged into the atmosphere before combustion, and the emission amount accounts for more than one thousandth of the carbon black output; this is for the annual For an enterprise that produces 100,000 tons of carbon black, at least 100 tons of carbon black ultrafine particles must be discharged into the atmosphere every year, and the pollution to the air can be imagined

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