Energy-saving production method and device for carbon black through off-line preheating of process air

Abstract

The invention discloses an energy-saving production method and device for carbon black through off-line preheating of process air. The method comprises the steps as follows: an existing online high-temperature air preheater is concealed; a front bypass tail gas burner is matched with a novel high-temperature air preheater for use; and the preheating temperature of charged process air is improved to about 1,000 DEG C from 800 DEG C, so that the consumption of fuel oil is reduced, and the yield of the carbon black is improved. The high-temperature air preheater has the outstanding advantages of economy and long-term operation high-efficiency stability; a carbon black by-product tail gas is recycled by the front tail gas burner, so that the comprehensive energy consumption of carbon black production is reduced again; the temperature of an outlet flue gas of a recovery reactor is improved to about 1250 DEG C from 950 DEG C by a high-gradient quenching heat exchanger, so that the consumption of primary quenching water is greatly reduced; and meanwhile, the produced steam is put into carbon black production, so that the overall comprehensive energy consumption of carbon black production is further reduced.

Description

technical field [0001] The invention belongs to the technical field of carbon black industry, and in particular relates to a carbon black energy-saving production method and device for preheating process air outside the line. Background technique [0002] The carbon black industry belongs to the field of high energy-consuming industries, in which the heat of carbon black products accounts for less than 50% of the total heat input of the reaction. Therefore, the configuration of the carbon black energy-saving system is particularly important in the production process, and it is also the key to controlling the comprehensive energy consumption of carbon black products. [0003] At present, the energy-saving method of carbon black production is mainly aimed at the recovery and utilization of the physical heat of high-temperature carbon black flue gas and the chemical heat of by-product tail gas. [0004] The physical heat recovery of high-temperature carbon black flue gas is to...

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Problems solved by technology

This not only wastes a lot of water resources and consumes a lot of energy, but also increases the water vapor content in the carbon black flue gas, which increases the load on the rear collection system, and also increases the cost of corresponding equipment and civil engineering.

[0005] And because the flue gas at the outlet of the reaction furnace contains a large amount of carbon black dust, the flue gas chooses to go through the tube side when exchanging heat in the online air preheater, and it is easy to adhere to the tube bundle, which is likely to cause a decrease in the heat transfer effect, so a high flow rate is usually used , large pipe diameter, and the increase in temperature difference lead to an increase in the thermal stress of the air preheater, so special materials and structures are required, the cost of equipment is high, and the service life is not long

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